CN109404873A - A method of utilizing the hot by-product superheated steam of high-temperature Fischer-Tropsch synthesis reaction - Google Patents
A method of utilizing the hot by-product superheated steam of high-temperature Fischer-Tropsch synthesis reaction Download PDFInfo
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- CN109404873A CN109404873A CN201811095107.3A CN201811095107A CN109404873A CN 109404873 A CN109404873 A CN 109404873A CN 201811095107 A CN201811095107 A CN 201811095107A CN 109404873 A CN109404873 A CN 109404873A
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- tropsch synthesis
- superheated steam
- synthesis reaction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
- F22B1/1838—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines the hot gas being under a high pressure, e.g. in chemical installations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
- F22G1/14—Steam superheating characterised by heating method using heat generated by chemical reactions
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Abstract
The present invention relates to a kind of methods using the hot by-product superheated steam of high-temperature Fischer-Tropsch synthesis reaction, and high-temperature Fischer-Tropsch synthesis reaction is carried out in reactor, and cold pipe is arranged in conversion zone, lead to supercooling tube for reaction and generate a large amount of reaction heat removal reactor, by-product saturated vapor；Boiler water is connected in cold pipe, the heat exchange of reaction heat and boiler water is led to supercooling tube and carried out, and boiler water recycles between cold pipe and drum, and the part boiler for returning to drum from cold pipe is water, and saturated vapor and boiler water separation, obtain saturated vapor in drum；Saturated vapor in drum is passed through the superheater tube in reactor, outlet obtains superheated steam.The present invention is high using high-temperature Fischer-Tropsch synthesis reaction temperature, the big feature of thermal discharge, by the way that the superheater tube in all or part of Returning reactor of the steam for paying production is overheated, both the investment and operating cost of superheater had been saved, the heat generated in reaction process is removed again, has carried out the reasonable utilization of energy well.
Description
Technical field
The present invention relates to a kind of heat utilization methods, utilize the hot by-product mistake of high-temperature Fischer-Tropsch synthesis reaction more particularly, to a kind of
The method of hot steam.
Background technique
With the increase of the liquid fuel demand based on petroleum and the reduction of petroleum resources usable storage, by coal etc.
The method that solid fuel produces available liquid fuel is increasingly valued by people.
Currently, having two methods of direct liquefaction and indirect liquefaction in the method that coal produces liquid fuel as raw material.Among it
It connecing liquefaction and is divided into Low Temperature Fischer Tropsch synthesis and high temperature fischer-tropsch two kinds of technologies of synthesis, Low Temperature Fischer Tropsch synthesis uses paste state bed reactor,
Reaction temperature is at 220-260 DEG C；High temperature fischer-tropsch synthesis uses fluidized-bed reactor, and reaction temperature is 330-360 DEG C, F- T synthesis
Reaction equation are as follows:
nCO+(n+m/2)H2=CnHm+nH2O+165kJ/molCO (1)
CO+H2O=CO2+H2+40kJ/molCO (2)
Wherein formula (2) water gas shift reaction is the side reaction of Fischer-Tropsch synthesis.
Comparatively the carbochain of high temperature fischer-tropsch synthetic product is shorter, and unsaturated hydrocarbons content is higher in product, is suitble to production attached
Value added higher chemicals is more advantageous to the recycling with heat since reaction temperature is higher.
Removing for high-temperature Fischer-Tropsch synthesis reaction heat generates saturated vapor generally by boiler water cycle at present, due to saturation
Steam can not long distance delivery, therefore industrially need saturated vapor being sent into superheater, be carried out by coal-fired or combustion gas
Heat.Current fire coal or combustion gas superheater all takes up a large area, and installation cost is high, and the thermal efficiency is lower, and explosion-proof in chemical industry
Setting combustion furnace also increases the security risk of device in area, and there is no obtain for the heat that on the other hand high-temperature gas of reaction carries
It is utilized to fine, has aggravated the thermic load of subsequent cooling system.
Summary of the invention
It is set it is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind does not increase overheat
The method for directly closing reaction heat production superheated steam using high temperature fischer-tropsch in the case where standby.
The purpose of the present invention can be achieved through the following technical solutions:
A method of using the hot by-product superheated steam of high-temperature Fischer-Tropsch synthesis reaction, using following steps:
A) high-temperature Fischer-Tropsch synthesis reaction is carried out in reactor, reaction gas blows catalyst and carries out gas-solid at fluidized state
Cold pipe is arranged in conversion zone in two phase reaction, leads to supercooling tube for reaction and generates a large amount of reaction heat removal reactor, above-mentioned reaction
Heat needs to remove in time, otherwise will cause reactor temperature runaway, removes reaction heat and is able to maintain that reaction temperature is stablized, while by-product is full
And steam；
B) be connected with boiler water in cold pipe, the heat exchange of reaction heat and boiler water is led to supercooling tube and is carried out, boiler water in cold pipe and
It is recycled between drum, constitutes heat-tranferring system using cold pipe and drum, the part boiler for returning to drum from cold pipe is water, in drum
Saturated vapor and boiler water separation, obtain saturated vapor；
C) saturated vapor in drum is passed through the superheater tube in reactor, outlet obtains superheated steam.
Superheated steam can be sent directly into pipe network, can also blend with drum saturated vapor and be sent into pipe network.Into superheater tube
The steam that the steam of overheat can be drum by-product is also possible to other same pressure rating steam, and the steam after overheat is in temperature control
Pipe network is sent into up to after overheating with the blending of by-product saturated vapor under the adjusting of valve processed.
The superheater tube is arranged in the top of cold pipe or arranges with cold pipe in identical height and position.
As preferred embodiment, the top of cold pipe is arranged in superheater tube, can reduce cold tube section product to emulsion zone
The influence of linear velocity, cold area under control can make full use of reaction heat to produce saturated vapor.
The cold pipe and superheater tube are made of 1 group or multiple groups U-tube or spiral coil, and the pipeline used is smooth wall pipe, wing
Piece pipe or bellows.
The reaction temperature of high-temperature Fischer-Tropsch synthesis reaction is 280-380 DEG C, reaction pressure 1.0-5.0MPa, by-product 1.5-
5.5MPa saturated vapor.
The temperature of the superheated steam is 40-100 DEG C.
Heat needed for high-temperature Fischer-Tropsch synthesis reaction steam superheating accounts for about the 10-30% of reactor thermal discharge under different operating conditions
Left and right, therefore heat exchange area required for superheater tube is less than the heat exchange area of cold pipe, reaction zone has enough space installation heat exchange
Pipe；High temperature fischer-tropsch synthesis has overheat of the sufficiently high temperature for saturated vapor again, therefore the present invention is for improving high temperature fischer-tropsch
The comprehensive utilization for synthesizing heat is significant.Compared to traditional by-product saturated vapor method, this patent saves superheater
Fixed investment and operating cost, while the comprehensive utilization ratio of high-temperature Fischer-Tropsch synthesis reaction heat is also improved, simplify steam mistake
The operation of heat.
Detailed description of the invention
Fig. 1 is process flow chart of the invention.
In figure, 1- reactor；2- drum；3- moves the cold pipe of heat；4- superheater tube；5- temperature control valve (TCV)；6- drum pressure is adjusted
Valve；7- boiler water circulating pump.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
A method of using the hot by-product superheated steam of high-temperature Fischer-Tropsch synthesis reaction, process flow is as shown in Figure 1, main
Including following three processes:
A) high-temperature Fischer-Tropsch synthesis reaction: high temperature fischer-tropsch synthesis carries out in reactor 1, the reaction of high-temperature Fischer-Tropsch synthesis reaction
Temperature is 280-380 DEG C, reaction pressure 1.0-5.0MPa, and reaction gas blows catalyst and carries out gas-particle two-phase at fluidized state
Reaction, near cold pipe 3, reaction generates hydro carbons and generates a large amount of reaction heat main conversion zone, it is necessary to it removes in time, it is no
It will cause reactor temperature runaways.
B) remove reaction heat, by-product saturated vapor: reactor heat-tranferring system is divided into 2 two devices of cold pipe 3 and drum, boiler
Water is recycled between cold pipe and drum by boiler water circulating pump 7, and the part boiler that Cong Lengguan 3 returns to drum 2 is water, in drum
Interior saturated vapor and boiler water separation, are additionally provided with drum pressure regulating valve 6 on drum 2.The heat of reaction heat and boiler water is handed over
It changes logical supercooling tube 3 to carry out, this process main function is to remove reaction heat, and maintaining reaction temperature is stablized, while by-product 1.5-
The saturated vapor of 5.5MPa；
C) steam superheating send pipe network: steam being passed through the superheater tube 4 in reactor, the overheat that outlet obtains 40-100 DEG C is steamed
Vapour, superheater tube 4 are arranged in the top of cold pipe 3 or arrange with cold pipe 3 in identical height and position, in order to obtain better effect, such as
Shown in Fig. 1, superheater tube 4 is arranged in the top of cold pipe 3, cold pipe 3 and superheater tube 4 by 1 group or multiple groups U-tube or spiral coil structure
At the pipeline used is smooth wall pipe, finned tube or bellows.Superheated steam can be sent directly into pipe network, can also be full with drum
It is blended with steam and is sent into pipe network.The steam that the steam overheated into superheater tube can be drum by-product is also possible to other same pressure
Grade steam, steam after overheat is under the adjusting of temperature control valve (TCV) 5 with the blending of by-product saturated vapor up to being sent into pipe network after overheat.
The following are the specific embodiments used in actual operation using above-mentioned technical process
Embodiment 1
600000 tons/year of high-temperature Fischer-Tropsch synthesis reaction device, 7.5 meters of diameter, oepration at full load thermal discharge 121MW, reaction temperature
350 DEG C of degree, by-product 4.4MPa saturated vapor are as follows: by this patent setting reactor from calculating parameter when overheating
| Reaction temperature | 350 | ℃ |
| Cold pipe heat exchange area | 1382 | m2 |
| Byproduct steam grade | 4.4 | Mpa |
| Byproduct steam amount | 261 | t/h |
| Heat exchange tube specification | 114.3*8.8 | mm |
| Cold pipe heat exchange area | 1382 | m2 |
| 8 meters of long chilled tube radicals | 574 | Root |
| Steam superheating temperature | 60 | ℃ |
| The area of superheater tube | 953 | m2 |
| 8 meters long superheater tube radical | 360 | Root |
Embodiment 2
High-temperature Fischer-Tropsch synthesis reaction device, 7.5 meters of diameter, oepration at full load thermal discharge 121MW, 350 DEG C of reaction temperature, by-product
3.0MPa saturated vapor is as follows: by this patent setting reactor from calculating parameter when overheating
| Reaction temperature | 350 | ℃ |
| Cold pipe heat exchange area | 1106 | m2 |
| Byproduct steam grade | 3 | Mpa |
| Byproduct steam amount | 261 | t/h |
| Heat exchange tube specification | 114.3*8.8 | mm |
| Cold pipe heat exchange area | 1106 | m2 |
| 8 meters of long chilled tube radicals | 460 | Root |
| Steam superheating temperature | 75 | ℃ |
| The area of superheater tube | 984 | m2 |
| 8 meters long superheater tube radical | 372 | Root |
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (8)
1. a kind of method using the hot by-product superheated steam of high-temperature Fischer-Tropsch synthesis reaction, which is characterized in that this method is using following
Step:
A) high-temperature Fischer-Tropsch synthesis reaction is carried out in reactor (1), cold pipe (3) is set in conversion zone, leading to supercooling tube (3) will be anti-
A large amount of reaction heat should be generated and remove reactor (1), by-product saturated vapor；
B) boiler water is connected in cold pipe (3), the heat exchange of reaction heat and boiler water is led to supercooling tube (3) and carried out, and boiler water is in cold pipe
(3) it is recycled between drum (2), the part boiler that Cong Lengguan (3) returns to drum (2) is water, saturated vapor and pot in drum
The separation of furnace water, obtains saturated vapor；
C) saturated vapor in drum is passed through the superheater tube (4) in reactor, outlet obtains superheated steam.
2. a kind of method using the hot by-product superheated steam of high-temperature Fischer-Tropsch synthesis reaction according to claim 1, feature
It is, the superheated steam is sent directly into pipe network or send with drum saturated vapor and/or other same pressure rating steam blending
Enter pipe network.
3. a kind of method using the hot by-product superheated steam of high-temperature Fischer-Tropsch synthesis reaction according to claim 1 or 2, special
Sign is that the superheated steam is sent into pipe network after temperature control valve is adjusted.
4. a kind of method using the hot by-product superheated steam of high-temperature Fischer-Tropsch synthesis reaction according to claim 1, feature
It is, superheater tube (4) setting is arranged in the top of cold pipe (3) or with cold pipe (3) in identical height and position.
5. a kind of method using the hot by-product superheated steam of high-temperature Fischer-Tropsch synthesis reaction according to claim 4, feature
It is, the superheater tube (4) is preferably provided at the top of cold pipe (3).
6. a kind of method using the hot by-product superheated steam of high-temperature Fischer-Tropsch synthesis reaction according to claim 1 or 4 or 5,
It is characterized in that, the cold pipe (3) and superheater tube (4) are made of 1 group or multiple groups U-tube or spiral coil, the pipeline used for
Smooth wall pipe, finned tube or bellows.
7. a kind of method using the hot by-product superheated steam of high-temperature Fischer-Tropsch synthesis reaction according to claim 1, feature
It is, the reaction temperature of high-temperature Fischer-Tropsch synthesis reaction is 280-380 DEG C, reaction pressure 1.0-5.0MPa, by-product 1.5-
5.5MPa saturated vapor.
8. a kind of method using the hot by-product superheated steam of high-temperature Fischer-Tropsch synthesis reaction according to claim 1, feature
It is, the temperature of the superheated steam is 40-100 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811095107.3A CN109404873A (en) | 2018-09-19 | 2018-09-19 | A method of utilizing the hot by-product superheated steam of high-temperature Fischer-Tropsch synthesis reaction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110186022A (en) * | 2019-06-03 | 2019-08-30 | 上海国际化建工程咨询有限公司 | A kind of high temperature vertical type coiler waste heat boiler suitable for by-product superheated steam |
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Application publication date: 20190301 |