CN115463441B - Packing and large-aperture flow-through column plate combined rectifying column and rectifying method - Google Patents
Packing and large-aperture flow-through column plate combined rectifying column and rectifying method Download PDFInfo
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- CN115463441B CN115463441B CN202110652534.2A CN202110652534A CN115463441B CN 115463441 B CN115463441 B CN 115463441B CN 202110652534 A CN202110652534 A CN 202110652534A CN 115463441 B CN115463441 B CN 115463441B
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- 238000012856 packing Methods 0.000 title claims abstract description 254
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 218
- 239000000945 filler Substances 0.000 claims abstract description 29
- 238000003825 pressing Methods 0.000 claims abstract description 29
- 238000009826 distribution Methods 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000010992 reflux Methods 0.000 claims abstract description 10
- 238000012546 transfer Methods 0.000 claims description 62
- 239000007791 liquid phase Substances 0.000 claims description 35
- 239000012071 phase Substances 0.000 claims description 32
- 230000000149 penetrating effect Effects 0.000 claims description 21
- 239000011148 porous material Substances 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 12
- 230000016507 interphase Effects 0.000 claims description 10
- 230000000630 rising effect Effects 0.000 claims description 10
- 238000000926 separation method Methods 0.000 abstract description 12
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 22
- 239000007789 gas Substances 0.000 description 22
- 229920000642 polymer Polymers 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000007670 refining Methods 0.000 description 8
- 238000006116 polymerization reaction Methods 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 238000003466 welding Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 4
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 description 2
- UEXCJVNBTNXOEH-UHFFFAOYSA-N Ethynylbenzene Chemical group C#CC1=CC=CC=C1 UEXCJVNBTNXOEH-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 150000001993 dienes Chemical class 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 231100000241 scar Toxicity 0.000 description 2
- 208000032544 Cicatrix Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000037387 scars Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/143—Fractional distillation or use of a fractionation or rectification column by two or more of a fractionation, separation or rectification step
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
A packing, large aperture flow-through column plate combined rectifying column and rectifying method, comprising: the tower body and the filler, the internal structure of the tower body is sequentially provided with: the upper part of the packed tower, the middle part of the packed tower and the lower part of the packed tower are respectively formed; the upper part and the middle part of the packing tower respectively comprise a reflux distribution pipe, a groove type liquid distributor, a packing pressing ring, packing, a packing support piece and a liquid collector which are sequentially arranged from top to bottom; the lower part of the packed tower comprises an oil collecting tank, a liquid falling plate, a liquid receiving disc, a large-aperture flow-through tray and a liquid collector which are sequentially arranged from top to bottom; the upper and middle components of the invention meet the requirements of separating mixed materials, the lower component can realize the partial separation of components and solve the problem of blockage, and the upper, middle and lower structural combinations not only solve the separation requirements of products, but also reduce the risk of blockage of tower internals and prolong the operation period of the device.
Description
Technical Field
The invention provides a packing, a large-aperture flow-through column plate combined rectifying column and a rectifying method, and belongs to the technical field of rectification.
Background
In recent years, the petrochemical industry in China has been actively developed, a rectifying tower is one of the indispensable equipment in the petrochemical production process, is a tower type gas-liquid contact device for rectifying, and utilizes the characteristic that each component in a mixture has different volatilities, namely the vapor pressures of each component are different at the same temperature, so that light components (low-boiling substances) in a liquid phase are transferred into a gas phase, and heavy components (high-boiling substances) in the gas phase are transferred into the liquid phase, thereby realizing the purpose of separation, and the rectifying towers adopted at home and abroad are generally plate type towers and packed towers.
The packing tower has the characteristics of small pressure drop, short residence time and the like, is suitable for separating easily foaming systems, corrosive systems, thermosensitive systems and the like, but is easy to block the packing in particularly easily polymerized media, such as polymers which contain high-purity diolefins and the like and are easily produced by self-polymerization or inter-polymerization, and seriously influences the long-period operation of the device. With the high-speed increase of the economy in China, the demands of styrene, isoprene, butadiene and the like serving as monomers are larger and larger, and the styrene, the isoprene, the butadiene and the like have active chemical properties and are easy to self-polymerize or inter-polymerize to generate some polymers, so that the tray is easy to be blocked. In the production process, in order to reduce the polymerization rate, generally vacuum operation is adopted, the temperature in the system is reduced, a packed tower is generally adopted as rectifying equipment, the monomers are more or less polymerized, some polymers are inevitably generated, the packed tower is adopted as rectifying, the polymers are easy to block the packing, particularly the packing at the lower part is seriously blocked, local shutdown is caused, and the long-period operation of a production device is not facilitated.
The process includes separating and cutting the styrene into two fractions of C 8 and C 9, hydrogenating the C8 fraction to eliminate phenylacetylene impurity, extracting, decolorizing and refining to obtain styrene product, and negative pressure operation of styrene refining tower to reduce pressure drop. In the actual production process, under the action of factors such as oxygen, fe 2+, temperature, ethylbenzene, a decolorizing agent (maleic anhydride) and the like, the copolymer of styrene and the decolorizing agent can easily block tower internals, and the fillers in the refining tower are blocked for many times after three months of operation, so that the long-period operation of the device is seriously influenced.
Based on the defects in the prior art, a structure and a method for reducing the risk of lower blockage are needed to be invented, wherein the advantages of small pressure drop and short residence time of a packed tower can be maintained.
Disclosure of Invention
The invention provides a packing and large-aperture flow-through column plate combined rectifying tower and a packing and large-aperture flow-through column plate combined rectifying method, and aims to solve the technical problems that in the prior art, the packing tower is not enough in anti-blocking capacity, polymers are easy to block the packing, and particularly the packing at the lower part is seriously blocked, so that local shutdown is caused.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
A packed, large pore diameter flow-through tray combined rectifying column comprising: the tower body and the filler, wherein the internal structure of the tower body is sequentially provided with: the upper part of the packed tower is 1, the middle part of the packed tower is 2, and the lower part of the packed tower is 3;
The upper part component 1 of the packing tower comprises a reflux distribution pipe I11, a groove type liquid distributor I12, a packing pressing ring I13, a packing I14, a packing support piece I15 and a liquid collector I16 which are sequentially arranged from top to bottom; the lower end of the packing is supported by a packing support piece I, the upper end of the packing is tightly pressed by a packing pressing ring I, and an anti-wall flow ring is arranged at a gap between the packing I and the tower wall; the first packing consists of multiple layers of packing, and the lowest layer is 45 degrees with the packing support piece and 90 degrees are formed between the lowest layer and each layer;
The packing tower middle part component 2 comprises a liquid collector redistributor 21, a groove type liquid distributor II 22, a packing pressing ring II 23, a packing II 24, a packing support II 25 and a liquid collector II 26 which are sequentially arranged from top to bottom; the lower end of the second packing is supported by a second packing support piece, the upper end of the second packing is tightly pressed by a second packing pressing ring, and an anti-wall flow ring is arranged at a gap between the second packing and the tower wall; the second filler is horizontally arranged, the second filler consists of a plurality of layers of fillers, and the lowest layer is 45 degrees with the filler support piece and is mutually arranged at 90 degrees; the liquid collector redistributor 21 receives the liquid conveyed by the liquid collector I16;
The packing tower lower part component 3 comprises an oil collecting tank 31, a first liquid reducing plate 32, a liquid receiving plate 39, a first large-aperture flow-through tray 33, a second liquid reducing plate 34, a liquid receiving plate 39, a second large-aperture flow-through tray 35, a third liquid reducing plate 37 and a liquid collector 36 which are sequentially arranged from top to bottom; the oil collecting tank 31 receives the liquid conveyed by the second liquid collector 26;
and the first packing and the second packing are pore plate corrugated structured packing.
The packing and large-aperture flow-through column plate combined rectifying column is characterized in that a liquid-falling plate and large-aperture flow-through column plate combination is arranged in multiple layers.
The packing and large-aperture flow-through tower plate combined rectifying tower is characterized in that a plurality of penetrating holes 30 are uniformly distributed on the upper part of each large-aperture flow-through tower plate, a cylinder 38 with a plurality of cylindrical holes 381 penetrating up and down is arranged corresponding to each penetrating hole, the periphery of the penetrating holes is connected with the periphery of the penetrating holes through bolts 383 through an integrally connected flange connecting plate 382 arranged on the periphery of the bottom of the cylindrical hole, and the penetrating holes are communicated with the cylindrical holes.
The packing and large-aperture flow-through tray combined rectifying tower is characterized in that the diameter of the cylinder 38 is 100mm, the height of the cylinder is 15mm, and the inner diameter of the cylinder hole is at least 13mm.
A packing and large-aperture flow-through column plate combined rectification method comprises the following steps:
(1) The liquid phase component at the top of the tower body firstly enters the upper part of the packed tower to form 1,
In the upper part composition 1 of the packing tower, liquid phase components firstly enter a groove type liquid distributor I12 through a reflux distribution pipe I11, liquid is uniformly distributed into a packing I14, a gas-liquid mass transfer place is provided through inter-phase contact, after gas-liquid mass transfer is carried out on the liquid phase components rising into the packing I from a vent hole, the gas phase components rise into the top of the packing tower from the vent hole to be collected and then are sent out of a system, and the liquid phase components enter the middle part of the packing tower of the next layer to be formed 2 after being collected by a liquid collector I16;
(2) The liquid after gas-liquid mass transfer enters the middle part of the packed tower to form 2,
In the middle part composition 2 of the packing tower, the liquid collected by the first liquid collector 16 enters the liquid collector redistributor 21 and the second trough-type liquid distributor 22, the liquid is uniformly distributed into the second packing 23, a gas-liquid mass transfer place is provided by inter-phase contact, gas-liquid mass transfer is carried out on the liquid and gas-phase components rising into the second packing through the vent holes, and after the gas-liquid mass transfer, the gas-phase components rise into the first packing formed by the upper part of the upper packing tower through the vent holes and continue to carry out the gas-liquid mass transfer; after being collected by the second liquid collector 26, the liquid phase component enters the oil collecting tank 31 of the lower part component 3 of the packed tower for collection;
(3) The liquid after gas-liquid mass transfer enters the lower part of the packed tower to form 3,
In the lower part component 3 of the packed tower, liquid collected by the oil collecting tank 31 firstly enters the liquid receiving disc 39 through the first liquid reducing plate 32, the first high-aperture flow-through tray 33 at the upper layer, carries out gas-liquid mass transfer and heat transfer with gas phase components rising into the flow-through tray from the vent holes, and then enters the next liquid receiving disc 39 through the second liquid reducing plate 34 and the second high-aperture flow-through tray 35 for further separation; finally, the liquid enters the liquid collector 36 through the third liquid falling plate 37 and is sent out of the system after being collected.
The packing and large-aperture flow-through column plate combined rectification method is characterized in that the packing I and the packing II adopt pore plate corrugated structured packing, the material is 316L, the operation temperature is 72-81 ℃, and the operation pressure is 11.0-12.5KPa (a) (KPa represents pressure unit and kilopascals (a) represents absolute pressure).
The packing and large-aperture flow-through column plate combined rectification method comprises the steps that a plurality of penetrating holes are uniformly distributed on the upper parts of a first large-aperture flow-through column plate and a second large-aperture flow-through column plate, a cylinder 38 with a plurality of cylindrical holes 381 penetrating up and down is arranged corresponding to each penetrating hole 30, the periphery of the bottom of the cylinder 38 is connected with the periphery of the penetrating hole through a flange connecting plate 382 which is integrally connected with the periphery of the penetrating hole through bolts 383, and the penetrating holes are communicated with the cylindrical holes; the gas phase passes through the cylindrical holes.
The packing and large-aperture flow-through column plate combined rectification method is characterized in that the diameter of the cylinder 38 is 100mm, the height is 15mm, and the inner diameter of the cylinder hole is at least 13mm.
The invention has the technical characteristics that:
(1) Filler type selection requires: adopting pore plate corrugated structured packing, wherein the material is 316L, the operation temperature is 72-81 ℃, and the operation pressure is 11.0-12.5KPa (a) (KPa stands for pressure unit, kilopascals, (a stands for absolute pressure));
(2) The manufacturing requirements of the large-aperture flow-through tower plate are as follows: the material 316L, the perforated part of the column plate is connected with a cylinder part, the cylinder is provided with a plurality of cylindrical holes with diameter of 13mm, the inner wall of the round hole is required to be smooth, burrs are avoided, and the diameter of the column tray is determined according to the selected inner diameter of the column;
(3) The upper part of the packed tower comprises: the upper part of the packing tower mainly comprises a backflow distribution pipe, a groove-type liquid distributor, a packing pressing ring, packing, a packing support and a liquid collector, wherein backflow liquid enters the groove-type liquid distributor through the backflow distribution pipe, liquid is uniformly distributed and then enters a structured packing, a gas-liquid mass transfer place is provided through alternate contact, the structured packing is fixed through the packing pressing ring and the packing support, after gas-liquid mass transfer, liquid phase components are collected by the liquid collector, and gas phase components rise to the top of the packing tower through vent holes;
(4) Middle part of the packed tower is composed of: the middle part of the packing tower mainly comprises a liquid collector redistributor, a groove-type liquid distributor, a packing pressing ring, packing, a packing support and a liquid collector, wherein liquid subjected to gas-liquid mass transfer enters the groove-type liquid distributor, and enters structured packing after being uniformly distributed, and gas-liquid mass transfer places are provided by inter-phase contact;
(5) The lower part of the packed tower comprises: the lower part of the packed tower mainly comprises an oil collecting tank, a large-aperture flow-through tray, a liquid-reducing plate and a liquid collecting tray, wherein liquid collected by the oil collecting tank firstly enters the upper-layer large-aperture flow-through tray through the liquid-reducing plate to transfer mass and heat with gas phase components, then enters the next-layer large-aperture flow-through tray through the liquid-reducing plate to further separate, so that the separation effect is improved for full mass and heat transfer, multiple layers of large-aperture flow-through trays can be designed according to the space condition and the separation precision of the lower part of the tower, and finally the liquid enters the liquid collecting tray to be collected and then is sent out of the system.
(6) According to the standard specification requirements of the regular packing manufacture, the outer diameter of the packing is smaller than the diameter of the tower body, and the pore plate corrugated regular packing is preferably selected; the gap between the filler and the tower wall is determined according to the adopted form of the wall-flow preventing ring, and the wall-flow preventing ring is arranged at the gap between the filler and the tower wall; the structured packing is horizontal, the first disc packing and the packing support grid bars form 45 degrees, and later the disc packing form 90 degrees; after the packing is installed, the packing is properly compressed by a packing pressing ring, and the nut is screwed after the levelness is adjusted;
(7) The welding seams are all continuous welding, welding slag is removed after welding, and polishing is carried out; the tray plate is straight and has no bending phenomenon, and acute angles and burrs cannot be formed; the center distance deviation of adjacent round holes at the tops of all the cylindrical parts is not more than +/-0.3 mm; the inner wall of the tower at the position where the structured packing is installed should be ground flat, the weld scar and the welding slag should be removed completely, and the height of the bulge is less than 2mm;
(8) The distance between the oil collecting tank and the tower tray is based on the upper surface of the oil collecting tank supporting ring; the tray spacing is based on the upper surface of the tray supporting ring; the tray deck and the channel deck must be installed such that the channel deck is vertically positioned above and below.
(9) The invention reserves partial filler at the upper part of the filler tower, and replaces the filler at the lower part with the large-aperture flow-through tower plate, thus not only ensuring the separation requirement of the rectifying tower, but also greatly prolonging the production period of the refining tower. The packing tower is not suitable for processing materials containing solid suspended matters, the large-aperture flow-through tower plate can effectively process the materials, and the combination mode of replacing partial packing by the large-aperture flow-through tower plate can change the technical problems that when a single tower internal part is a combined tower internal part, a certain material system blocks the tower internal part and the pure packing tower has insufficient anti-blocking capability,
The invention has the technical effects that: the rectifying tower combined by the filler and the large-aperture flow-through tower plate can separate easily polymerized materials to obtain required products, reduce the risk of blockage of tower internals and prolong the operation period of the device.
FIG. 1 is a schematic diagram of the rectifying tower structure of the invention,
FIG. 2 is a cross-sectional view of FIG. 1 showing the multi-layer composition of either the first or second filler of the present invention, wherein the first disk filler 17 of the lowest layer in the first filler (the first disk filler 27 of the second lowest layer in the second filler) forms an angle of 45 degrees with the support frame;
FIG. 3 is an enlarged schematic view of the structure of the lower component 3 of the packed column of the present invention,
FIG. 4 is a schematic plan view of a large aperture flow-through tray of the present invention,
Figure 5 shows a schematic view of the structure of the cylinder (38) according to the invention,
Figure 6 is a schematic top view of a cylinder according to the invention,
Figure 7 is a schematic cross-sectional view of a cylinder according to the invention,
Fig. 8 is a schematic view of the structure of the liquid receiving disc (39) of the invention.
FIG. 9 is a schematic view of the structure of the liquid receiving plate of the present invention.
Description of the drawings:
The upper part of the packing tower is provided with a first component 1, a first reflux distribution pipe 11, a first trough-type liquid distributor 12, a first packing pressing ring 13, a first packing 14, a first packing support 15, a first liquid collector 16 and a first packing 17;
the middle part of the packing tower is composed of 2 parts, a liquid collector redistributor 21, a second trough type liquid distributor 22, a second packing pressing ring 23, a second packing 24, a second packing support 25, a second liquid collector 26 and a second packing first disc packing 27;
the lower part of the packed tower comprises a third component 3, an oil collecting tank 31, a first liquid reducing plate 32, a first large-aperture flow-through tray 33, a second liquid reducing plate 34, a second large-aperture flow-through tray 35, a liquid collector 36, a third liquid reducing plate 37, a cylinder 38 and a liquid receiving tray 39; a penetrating hole 30, a cylindrical hole 381, a cylindrical body 38, a flange connection plate 382, bolts 383, clips 391, bolts 392;
A tower 4;
Detailed Description
The following detailed description of the technical scheme of the present invention is provided, but the present invention is not limited to the following descriptions:
Referring to FIGS. 1-9, the packing and large-aperture flow-through tray combined rectifying tower comprises: the tower body 4 and the filler, wherein the internal structure of the tower body is sequentially provided with: the upper part of the packed tower is 1, the middle part of the packed tower is 2, and the lower part of the packed tower is 3;
Referring to fig. 1, the packing tower upper component 1 comprises a reflux distribution pipe 11, a trough type liquid distributor 12, a packing pressing ring 13, a packing 14, a packing support 15 and a liquid collector 16 which are sequentially arranged from top to bottom; the lower end of the packing is supported by a packing support piece I, the upper end of the packing is tightly pressed by a packing pressing ring I, and an anti-wall flow ring is arranged at a gap between the packing I and the tower wall; the first packing consists of multiple layers of packing, and the lowest layer is 45 degrees with the packing support piece and 90 degrees are formed between the lowest layer and each layer;
The packing tower middle part component 2 comprises a liquid collector redistributor 21, a groove type liquid distributor II 22, a packing pressing ring II 23, a packing II 24, a packing support II 25 and a liquid collector II 26 which are sequentially arranged from top to bottom; the lower end of the second packing is supported by a second packing support piece, the upper end of the second packing is tightly pressed by a second packing pressing ring, and an anti-wall flow ring is arranged at a gap between the second packing and the tower wall; the second filler is horizontally arranged, the second filler consists of a plurality of layers of fillers, and the lowest layer is 45 degrees with the filler support piece and is mutually arranged at 90 degrees; the liquid collector redistributor 21 receives the liquid conveyed by the liquid collector I16;
The packing tower lower part component 3 comprises an oil collecting tank 31, a first liquid reducing plate 32, a liquid receiving plate 39, a first large-aperture flow-through tray 33, a second liquid reducing plate 34, a liquid receiving plate 39, a second large-aperture flow-through tray 35, a third liquid reducing plate 37 and a liquid collector 36 which are sequentially arranged from top to bottom; the oil collecting tank 31 receives the liquid conveyed by the second liquid collector 26;
and the first packing and the second packing are pore plate corrugated structured packing.
The packing and large-aperture flow-through column plate combined rectifying column is characterized in that a liquid-falling plate and large-aperture flow-through column plate combination can be arranged in multiple layers.
Referring to fig. 3, 4, 5, 6 and 7, the packing and large-aperture flow-through tray combined rectifying tower is characterized in that a plurality of through holes 30 are uniformly distributed on the upper part of each large-aperture flow-through tray, a cylinder 38 with a plurality of cylindrical holes 381 penetrating up and down is arranged corresponding to each through hole, and an integrally connected flange connecting plate 382 is arranged on the periphery of the bottom of the cylinder 38 and is connected with the periphery of the through hole through bolts 383, and the through holes are communicated with the cylindrical holes.
The packing and large-aperture flow-through tray combined rectifying tower is characterized in that the diameter of the cylinder 38 is 100mm, the height of the cylinder is 15mm, and the inner diameter of the cylinder hole is at least 13mm.
The invention relates to a packing and large-aperture flow-through column plate combined rectification method, which comprises the following steps:
(1) The liquid phase component at the top of the tower body firstly enters the upper part of the packed tower to form 1,
In the upper part composition 1 of the packing tower, liquid phase components firstly enter a groove type liquid distributor I12 through a reflux distribution pipe I11, liquid is uniformly distributed into a packing I14, a gas-liquid mass transfer place is provided through inter-phase contact, after gas-liquid mass transfer is carried out on the liquid phase components rising into the packing I from a vent hole, the gas phase components rise into the top of the packing tower from the vent hole to be collected and then are sent out of a system, and the liquid phase components enter the middle part of the packing tower of the next layer to be formed 2 after being collected by a liquid collector I16;
(2) The liquid after gas-liquid mass transfer enters the middle part of the packed tower to form 2,
In the middle part composition 2 of the packing tower, the liquid collected by the first liquid collector 16 enters the liquid collector redistributor 21 and the second trough-type liquid distributor 22, the liquid is uniformly distributed into the second packing 23, a gas-liquid mass transfer place is provided by inter-phase contact, gas-liquid mass transfer is carried out on the liquid and gas-phase components rising into the second packing through the vent holes, and after the gas-liquid mass transfer, the gas-phase components rise into the first packing formed by the upper part of the upper packing tower through the vent holes and continue to carry out the gas-liquid mass transfer; after being collected by the second liquid collector 26, the liquid phase component enters the oil collecting tank 31 of the lower part component 3 of the packed tower for collection;
(3) The liquid after gas-liquid mass transfer enters the lower part of the packed tower to form 3,
In the lower part component 3 of the packed tower, liquid collected by the oil collecting tank 31 firstly enters the liquid receiving disc 39 through the first liquid reducing plate 32, the first high-aperture flow-through tray 33 at the upper layer, carries out gas-liquid mass transfer and heat transfer with gas phase components rising into the flow-through tray from the vent holes, and then enters the next liquid receiving disc 39 through the second liquid reducing plate 34 and the second high-aperture flow-through tray 35 for further separation; finally, the liquid enters the liquid collector 36 through the third liquid falling plate 37 and is sent out of the system after being collected.
The packing and large-aperture flow-through column plate combined rectification method is characterized in that the packing I and the packing II adopt pore plate corrugated structured packing, the material is 316L, the operation temperature is 72-81 ℃, and the operation pressure is 11.0-12.5KPa (a) (KPa represents pressure unit and kilopascals (a) represents absolute pressure).
The packing and large-aperture flow-through column plate combined rectification method comprises the steps that a plurality of penetrating holes are uniformly distributed on the upper parts of a first large-aperture flow-through column plate and a second large-aperture flow-through column plate, a cylinder 38 with a plurality of cylindrical holes 381 penetrating up and down is arranged corresponding to each penetrating hole 30, the periphery of the bottom of the cylinder 38 is connected with the periphery of the penetrating hole through a flange connecting plate 382 which is integrally connected with the periphery of the penetrating hole through bolts 383, and the penetrating holes are communicated with the cylindrical holes; the gas phase passes through the cylindrical holes.
The packing and large-aperture flow-through column plate combined rectification method is characterized in that the diameter of the cylinder 38 is 100mm, the height is 15mm, and the inner diameter of the cylinder hole is at least 13mm.
The structured packing can be selected from orifice plate corrugated packing, and the materials, sizes, shapes and the like of the reflux distribution pipe, the groove type liquid distributor, the packing pressing ring, the packing support piece and the liquid collector are determined according to the conventional selection of the selected packing tower.
The working principle of the invention and the functional function and technical characteristics of each component are as follows:
The invention utilizes the mixture (such as easy-to-polymerize diolefin and self-polymer) to have different volatility, so that the light component (low-boiling-point substance) in the liquid phase is transferred into gas phase, and the heavy component (high-boiling-point substance) in the gas phase is transferred into liquid phase, thereby realizing the purpose of separation. The medium to be separated has self-polymerization property, and low-pressure, low-temperature and short-residence-time operation conditions are favorable for separating the medium, so that the medium is suitable for separation by a filler tower, but the polymer in the medium is continuously separated by a rectifying tower, the polymer is concentrated to a certain degree to block the lower filler, the long-period operation of the device is influenced, and the problems of the filler, the large-aperture flow-through tower plate combined rectifying tower and the rectifying method are effectively solved.
The working flow of the invention is as follows: the mixture enters a rectifying tower, firstly, heat exchange is carried out on the mixture and gas rising in the tower (heat is provided by a tower kettle reboiler), condensed liquid phase components enter an oil collecting tank 31, the condensed liquid phase components are sent into a large-aperture flow-through tower plate I33 through a first liquid-falling plate 32, after gas phase passes through the cylindrical holes, mass transfer and heat transfer are carried out on gas-liquid two-phase components on the tower plate, the liquid phase components enter a next layer of large-aperture flow-through tower plate II 35 through a second liquid-falling plate 34, the mass transfer and the heat transfer are carried out on the gas-liquid two-phase components, and finally, the liquid phase heavy components enter the tower kettle through a third liquid collector 36 and are sent out of the device; the diameter of the cylinder 38 is 100mm, the height is 15mm, and the inner diameter of the cylinder hole is at least 13mm, so that the polymer is concentrated to a certain degree and the phenomenon of blocking the tower plate is avoided; the gas phase component gradually rises in the tower, after mass transfer and heat transfer are carried out on the large-aperture flow-through tower plate and the liquid phase component, the liquid phase component enters the second packing 24 through the air-rising holes, the packing provides mass transfer and heat transfer places, the target product is further separated, the liquid phase component enters the first packing 14 at the lower layer through the second liquid collector, the mass transfer and the heat transfer are also carried out, the target product is further separated, the product meets the quality requirement of the product, the liquid phase component in the first packing enters the second packing at the lower layer, the gas phase component continuously rises and flows back with the liquid phase (after heat exchange is carried out through the reflux distribution pipe entering the first groove-type liquid distributor 12, the liquid phase component enters the top of the rectifying tower, and the final product is obtained after cooling and collection.
The process according to the invention is illustrated below with reference to specific examples:
Example 1:
the invention relates to a packing, a large-aperture flow-through column plate combined rectifying column and a rectifying method, and the structure of the rectifying column is not repeated as described above, and the method for solving the problem of insufficient anti-blocking capacity of the packing column comprises the following steps:
(1) Filler type selection requires: adopting pore plate corrugated structured packing, wherein the material is 316L, the operating temperature is 72-81 ℃, the operating pressure is 11.0-12.5KPa (absolute pressure), the number of packing layers is 2 (namely a first packing layer and a second packing layer), the height of a first packing layer is 3000mm, the height of a second packing layer is 6000mm, and the inner diameter of a tower is 1600mm;
(2) The manufacturing requirements of the large-aperture flow-through tower plate are as follows: the material 316L, the tray trompil position links to each other with the cylinder part, and the cylinder is opened there is a plurality of phi 13mm cylinder holes, requires that the round hole inner wall be smooth, does not have burr, tower internal diameter 1600mm, and the large aperture cross flow tray layer number is 4, and the board interval 1000mm, cylinder diameter are 100mm, and high 15mm, cylinder hole internal diameter are 13mm.
(3) The upper part of the packed tower comprises: the upper part of the packing tower mainly comprises a backflow distribution pipe, a groove-type liquid distributor, a packing pressing ring, packing, a packing support and a liquid collector, wherein backflow liquid enters the groove-type liquid distributor through the backflow distribution pipe, liquid is uniformly distributed and then enters the structured packing, a gas-liquid mass transfer place is provided through alternate contact, the structured packing is fixed through the packing pressing ring and the packing support, after gas-liquid mass transfer, liquid phase components are collected by the liquid collector, gas phase components rise to the top of the packing tower through vent holes, the inner wall of the tower is required to be ground flat at the position where the structured packing is installed, weld scars and welding slag are required to be removed, the protrusion height is less than 2mm, the structured packing is required to be horizontal, the first disc packing and the packing support grid are 45 degrees, then 90 degrees are formed between each disc packing, after the packing is installed, the structured packing is properly compressed by the packing pressing ring, and nuts are screwed after the levelness is adjusted;
(4) Middle part of the packed tower is composed of: the middle part of the packing tower mainly comprises a groove type liquid distributor, a packing pressing ring, packing, a packing support and a liquid collector, wherein liquid subjected to gas-liquid mass transfer enters the groove type liquid distributor, the liquid is uniformly distributed and then enters a structured packing, a gas-liquid mass transfer place is provided through inter-phase contact, the structured packing is fixed through the packing pressing ring and the packing support, after gas-liquid mass transfer, liquid phase components are collected by the liquid collector, and gas phase components rise to an upper layer of structured packing through a vent hole to continue gas-liquid mass transfer, so that the step (3) is required;
(5) The lower part of the packed tower comprises: the lower part of the packed tower mainly comprises an oil collecting tank, a large-aperture flow-through tray, a liquid-reducing plate and a liquid collecting tray, wherein liquid collected by the oil collecting tank firstly enters the upper-layer large-aperture flow-through tray through the liquid-reducing plate to transfer mass and heat with gas phase components, then enters the next-layer large-aperture flow-through tray through the liquid-reducing plate to further separate, in order to fully transfer mass and heat, improve the separation effect, multiple layers of large-aperture flow-through trays can be designed according to the space condition and the separation precision of the lower part of the tower, finally, the liquid enters the liquid collecting tray to be collected and then is sent out of the system, the distance between the oil collecting tank and the tray is required to be controlled by the upper surface of the oil collecting tank supporting ring, the distance between the tray is controlled by the upper surface of the tray supporting ring, and the tray and the channel plate are required to be arranged at the same vertical position.
After the scheme is implemented, the styrene refining tower is operated for 1 year without blocking, and the operation is stable.
Comparative example 1:
(1) Structured packing is adopted in the upper, middle and lower sections of the styrene refining tower. The upper section mainly comprises a backflow distribution pipe, a groove-type liquid distributor, a packing pressing ring, a regular packing, a packing support and a liquid collector, wherein backflow liquid enters the groove-type liquid distributor through the backflow distribution pipe, liquid is uniformly distributed and then enters the regular packing, a gas-liquid mass transfer place is provided through inter-phase contact, the regular packing is fixed through the packing pressing ring and the packing support, after gas-liquid mass transfer, liquid phase components are collected by the liquid collector, and gas phase components rise to the top of a packing tower through vent holes; the middle section and the lower section mainly comprise a groove type liquid distributor, a packing pressing ring, a structured packing, a packing support and a liquid collector, wherein liquid subjected to gas-liquid mass transfer enters the groove type liquid distributor, the liquid is uniformly distributed and then enters the structured packing, a gas-liquid mass transfer place is provided through inter-phase contact, the structured packing is fixed through the packing pressing ring and the packing support, after gas-liquid mass transfer, liquid phase components are collected by the liquid collector, and gas phase components rise to an upper layer of structured packing through vent holes to continue gas-liquid mass transfer.
After this scheme is implemented, the lower floor's packing jam appears after the styrene refining tower operation 3 months, and tower pressure drop increases, influences the steady operation of device.
Comparative example 2:
(2) The styrene refining tower adopts a plate type tower structure. The tower internals mainly comprise a feeding and backflow distributing pipe, a sieve pore tray, a liquid falling plate and a liquid collecting tray, wherein the gas phase and the liquid phase are subjected to mass transfer and heat transfer on the sieve pore tray.
After this scheme was implemented, because the pressure drop of tower is big, and operating temperature is higher, and after the system was operated for 3 months, tower cauldron polymerization was serious, not only influenced the steady operation of device, influenced the quality of styrene product simultaneously.
From the above results, it can be seen that: the phenomenon of blocking the tower plates due to local polymerization exists in both the packed tower and the plate tower, and the stable operation of the device is seriously affected.
By combining the factors, the invention can solve the problem of insufficient anti-blocking capacity of the packed tower by adopting the mode of combining the packing and the large-aperture flow-through tower plate, can reduce the pressure drop of the tower, effectively reduce the polymerization rate and prolong the operation period of the device.
The foregoing examples are merely illustrative of the technical concept and technical features of the present invention, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made according to the essence of the present invention should be included in the scope of the present invention.
Claims (3)
1. A packed, large pore diameter flow-through tray combined rectifying column comprising: the tower body and the filler are characterized in that the internal structure of the tower body is sequentially provided with: the upper part of the packed tower comprises three parts, namely, a upper part (1), a middle part (2) and a lower part (3);
The upper part of the packing tower (1) comprises a reflux distribution pipe I (11), a groove type liquid distributor I (12), a packing pressing ring I (13), a packing I (14), a packing support piece I (15) and a liquid collector I (16) which are sequentially arranged from top to bottom; the lower end of the packing is supported by a packing support piece I, the upper end of the packing is tightly pressed by a packing pressing ring I, and an anti-wall flow ring is arranged at a gap between the packing I and the tower wall; the first packing is horizontally arranged, the first packing consists of a plurality of layers of packing, and the lowest layer is 45 degrees with the packing support piece and 90 degrees are formed between the lowest layer and each layer;
The packing tower middle part component (2) comprises a liquid collector redistributor (21), a groove type liquid distributor II (22), a packing pressing ring II (23), a packing II (24), a packing support II (25) and a liquid collector II (26) which are sequentially arranged from top to bottom; the lower end of the second packing is supported by a second packing support piece, the upper end of the second packing is tightly pressed by a second packing pressing ring, and an anti-wall flow ring is arranged at a gap between the second packing and the tower wall; the second packing is horizontally arranged, the second packing consists of a plurality of layers of packing, and the lowest layer is 45 degrees with the packing support piece and is mutually arranged at 90 degrees; the liquid collector redistributor (21) receives the liquid conveyed by the liquid collector I (16);
The lower part of the packing tower (3) comprises an oil collecting tank (31), a first liquid-falling plate (32), a liquid receiving disc (39), a first large-aperture flow-through tray (33), a second liquid-falling plate (34), a liquid receiving disc (39), a second large-aperture flow-through tray (35), a third liquid-falling plate (37) and a liquid collector (36) which are sequentially arranged from top to bottom; the oil collecting tank (31) receives the liquid conveyed by the second liquid collector (26);
the first packing and the second packing are pore plate corrugated structured packing;
The upper part of each large-aperture flow-through column plate is uniformly distributed with a plurality of through holes (30), a cylinder (38) with a plurality of cylindrical holes (381) which are vertically penetrated is arranged corresponding to each through hole, and the cylinder is connected with the periphery of the through holes through bolts (383) by an integrally connected flange connecting plate (382) which is arranged at the periphery of the bottom of the cylinder;
a liquid-falling plate Large aperture flow-through column plate the combination is arranged into a plurality of layers;
the diameter of the cylinder (38) is 100mm, the height is 15mm, and the inner diameter of the cylinder hole is at least 13mm.
2. The method for rectifying a packed, large pore size flow-through tray combined rectifying column according to claim 1, comprising:
(1) The liquid phase component at the top of the tower body firstly enters the upper part of the packed tower to form (1),
In the upper part composition (1) of the packing tower, liquid phase components firstly enter a groove type liquid distributor I (12) through a reflux distribution pipe I (11), liquid is uniformly distributed into the packing I (14), a gas-liquid mass transfer place is provided through inter-phase contact, after gas-liquid mass transfer is carried out on the liquid phase components rising into the packing I from a vent hole, the gas phase components rise into the top of the packing tower from the vent hole to be collected and then are sent out of the system, and the liquid phase components enter the middle part composition (2) of the packing tower of the next layer after being collected by a liquid collector I (16);
(2) The liquid after gas-liquid mass transfer enters the middle part of the packed tower to form (2),
In the middle part composition (2) of the packing tower, liquid collected by the first liquid collector (16) enters the liquid collector redistributor (21) and the second trough-type liquid distributor (22), the liquid is uniformly distributed into the second packing (24), a gas-liquid mass transfer place is provided through inter-phase contact, gas-liquid mass transfer is carried out on the liquid and gas-phase components rising into the second packing through the vent holes, and after the gas-liquid mass transfer, the gas-phase components rise into the first packing formed by the upper part of the upper packing tower through the vent holes and continue to carry out the gas-liquid mass transfer; after being collected by a second liquid collector (26), the liquid phase component enters an oil collecting tank (31) of a lower part component (3) of the packed tower for collection;
(3) The liquid after gas-liquid mass transfer enters the lower part of the packed tower to form (3),
In the lower part component (3) of the packed tower, liquid collected by the oil collecting tank (31) firstly enters a liquid receiving disc (39) through a first liquid reducing plate (32), passes through a first upper-layer large-aperture flow-through tray (33) and carries out gas-liquid mass transfer and heat transfer with gas phase components rising into the flow-through tray from a vent hole, and then enters a next liquid receiving disc (39) through a second liquid reducing plate (34) and further separates from a second large-aperture flow-through tray (35); finally, the liquid enters a liquid collector (36) through a liquid falling plate III (37) to be collected and then is sent out of the system;
the first packing and the second packing are pore plate corrugated structured packing, the material is 316L, the operation temperature is 72-81 ℃, and the operation pressure is 11.0-12.5KPa;
The upper parts of the large-aperture flow-through column plate I and the large-aperture flow-through column plate II are uniformly provided with a plurality of through holes, a cylinder (38) with a plurality of cylindrical holes (381) penetrating up and down is arranged corresponding to each through hole (30), the cylinder is connected with the periphery of the through holes through bolts (383) through a flange connecting plate (382) which is integrally connected with the periphery of the bottom of the cylinder, and the through holes are communicated with the cylindrical holes; the gas phase passes through the cylindrical holes.
3. A method of rectifying a packed, large pore size flow-through tray combined rectifying column according to claim 2, characterized in that said cylinder (38) has a diameter of 100mm and a height of 15mm, and the inside diameter of the cylinder hole is at least 13mm.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202876409U (en) * | 2012-09-29 | 2013-04-17 | 山东金岭化学有限公司 | Combined coarse monomer rectification device |
| CN202921011U (en) * | 2012-10-31 | 2013-05-08 | 重庆恒远晋通科技有限公司 | Distribution device for secondary distribution of gas phase and rectifying tower |
| CN206499894U (en) * | 2017-02-10 | 2017-09-19 | 天津辰力工程设计有限公司 | A kind of block-resistant type rectifying column for being used to handle DD mixtures |
| CN209771759U (en) * | 2018-11-16 | 2019-12-13 | 南京师范大学 | Semi-arc jet overflow type tower plate |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2643968Y (en) * | 2003-09-17 | 2004-09-29 | 中国成达工程公司 | Combined carbinol rectifying tower |
| US20090124825A1 (en) * | 2007-11-14 | 2009-05-14 | Shanghai Huayi Acrylic Acid Co., Ltd | Method of (meth) acrylate production |
| CN202506160U (en) * | 2012-02-29 | 2012-10-31 | 甘肃蓝科石化高新装备股份有限公司 | Slurry stripping tower with overflow weirs |
| FR3016533B1 (en) * | 2014-01-21 | 2016-01-15 | IFP Energies Nouvelles | DISPENSER PLATE FOR EXCHANGE COLUMN BETWEEN GAS AND LIQUID WITH LIQUID DEFLECTOR |
| CN206167967U (en) * | 2016-11-08 | 2017-05-17 | 赵爱娟 | Be provided with liquid trap, liquid distributor and cooling structure's rectifying column |
-
2021
- 2021-06-11 CN CN202110652534.2A patent/CN115463441B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202876409U (en) * | 2012-09-29 | 2013-04-17 | 山东金岭化学有限公司 | Combined coarse monomer rectification device |
| CN202921011U (en) * | 2012-10-31 | 2013-05-08 | 重庆恒远晋通科技有限公司 | Distribution device for secondary distribution of gas phase and rectifying tower |
| CN206499894U (en) * | 2017-02-10 | 2017-09-19 | 天津辰力工程设计有限公司 | A kind of block-resistant type rectifying column for being used to handle DD mixtures |
| CN209771759U (en) * | 2018-11-16 | 2019-12-13 | 南京师范大学 | Semi-arc jet overflow type tower plate |
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