CN107365607B - Compact natural gas pretreatment purification method suitable for offshore platform - Google Patents
Compact natural gas pretreatment purification method suitable for offshore platform Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
- C10L3/106—Removal of contaminants of water
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/54—Specific separation steps for separating fractions, components or impurities during preparation or upgrading of a fuel
- C10L2290/545—Washing, scrubbing, stripping, scavenging for separating fractions, components or impurities during preparation or upgrading of a fuel
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/56—Specific details of the apparatus for preparation or upgrading of a fuel
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Abstract
The invention relates to a deep purification treatment method for natural gas of an offshore platform, which optimizes a front and back natural gas liquid removal method of an original compressor of the offshore platform and is suitable for deep treatment of natural gas extracted by an offshore natural gas exploitation platform. The produced natural gas is subjected to online treatment by a compact online treatment device, and soluble salt ions and most of water in the natural gas are removed. And then the gas enters an inlet high-efficiency scrubbing tank, is dehydrated through the inlet high-efficiency scrubbing tank and then enters a compressor, and an outlet high-efficiency scrubbing tank arranged behind the compressor further removes liquid efficiently for the gas discharged by the compressor. The inlet and outlet efficient scrubbing tanks have the same internal structure, and gas sequentially passes through the inertia separation distributor, the micro-cyclone, the fin separation module and the fiber condensation module to achieve the effect of efficiently removing liquid from natural gas. The method removes soluble salt ions in the natural gas, then carries out high-efficiency liquid removal, and solves the problems of eccentric shutdown of a compressor, corrosion of a pipeline and the like caused by the salt-containing liquid contained in the natural gas from a source head.
Description
Technical Field
The invention relates to a deep purification treatment method for natural gas of an offshore platform, which is suitable for deep treatment and purification of natural gas produced by the offshore platform.
Background
With the rapid development of economy, the population number is increased, the energy consumption is increased, the emission of various harmful gases such as greenhouse gases is increased, and the living environment of human beings is deteriorated. The natural gas energy with cleanness, environmental protection and high heat value increasingly receives the attention of China and countries in the world, and the natural gas industry which is greatly developed becomes the inevitable choice for developing sustainable economy and improving the living environment of the nation in each country.
With the rapid development of economy and the rapid promotion of industrialization and urbanization, the total energy consumption of China continuously and rapidly increases. In recent years, natural gas has entered a rapid growth phase in our country. The natural gas is developed quickly, and the method is a very practical choice for increasing energy supply, optimizing energy structure, protecting ecological environment and controlling greenhouse gas emission. A large amount of natural gas reserves are found in the east sea and the south sea of China, so that the exploitation of marine natural gas in the future is bound to become a key development field of China.
Because natural oil contains a large amount of water vapor in natural gas, and the water vapor in the natural gas is generally in a saturated state, the specific content is greatly related to the temperature, the pressure, the natural gas components and the like of the natural gas. As natural gas is produced from the ground, its temperature, pressure, etc. parameters must change. At this time, water vapor in part of the natural gas is changed into liquid water to be separated out, and the oil-containing liquid water in the natural gas is very harmful to the subsequent process. The concrete expression is as follows: (1) Some gas molecules of natural gas are embedded into the crystal lattice of water molecules to form hydrates, the natural gas hydrates are solid substances with the form similar to snow or loose ice, and the generated hydrates can be accumulated at pipelines, valves and instruments to block the pipelines, valves and instruments and cause physical damage to the pipelines, valves and instruments, so that the generation of the hydrates is prevented. (2) Natural gas containing acid gases such as H2S, CO2 can form a highly corrosive acid solution after the acid gases are dissolved in water, which can cause corrosion damage to pipelines and equipment. (3) In the development process of natural gas, the brought-out underground water often contains mineral salts with very high concentration, when the liquid removal efficiency of ground process equipment is not high, a small amount of free water containing the mineral salts with high concentration enters a compressor along with the natural gas, in the multi-stage compression process, the gas temperature is increased, moisture is evaporated under the high-temperature condition, soluble salt is separated out and attached to the surface of an impeller of a rotor of the compressor to form salt scale, the dynamic balance state of the compressor is damaged, eccentricity occurs, and finally the compressor is seriously vibrated and is shut down.
The dehydration technologies commonly used at present include low-temperature condensation dehydration, triethylene glycol dehydration, molecular sieve dehydration and the like. The low-temperature condensation dehydration method belongs to physical dehydration. The most common equipment is the J-T valve and the turboexpander, since this process is very economical for high pressure natural gas purification, but generally requires the addition of inhibitors to prevent hydrate formation; refrigeration equipment is additionally arranged during deep dehydration, so that the cost is high; the difficulty of manufacturing high speed rotating components in a turbine is great. Triethylene glycol dehydration belongs to a solvent absorption method, is widely applied in industry, has high stability but is excessively complex in system, is inconvenient to maintain, and requires high energy consumption for triethylene glycol regeneration and is easy to lose. The molecular sieve dehydration method belongs to a solid adsorption method, has strong adsorption selectivity and high adsorption efficiency, but has high operation cost, huge equipment investment, high price of an adsorbent and extremely high regeneration energy consumption. Most of the methods are to remove water in the natural gas, and soluble salts in the high-mineral-content water at the ground bottom carried by the natural gas are not removed, so that once a small amount of water is not removed, the operation of subsequent equipment such as a compressor and the like is still greatly influenced. Therefore, a method for removing soluble salt ions carried in natural gas while efficiently removing water in the natural gas is needed.
Disclosure of Invention
In view of the above problems, the invention provides a deep purification treatment method for natural gas on an offshore platform.
The specific technical scheme is as follows:
the deep purification treatment method of the natural gas on the offshore platform comprises the following steps:
(1) The produced natural gas enters the system from a gas phase inlet A, and after being treated by the compact online treatment device (1), the gas phase flows into an inlet high-efficiency scrubbing tank (3) for high-efficiency liquid removal;
(2) The produced natural gas enters the system from a gas phase inlet A, and after being treated by the compact online treatment device (1), the removed liquid enters the inlet high-efficiency scrubbing tank (3);
(3) The treatment of the compact online treatment device (1) in the steps (1) and (2) specifically comprises the steps that natural gas sequentially passes through a spray washing unit (1-2) to inject circulating water into the natural gas, an umbrella-shaped gas-liquid uniform distribution unit (1-3) pre-distributes mixed materials to uniformly mix gas-liquid two phases and then enter a subsequent mixing mass transfer unit, the natural gas-washing water mixing mass transfer unit (1-4) adopts a high-efficiency mixing element to fully contact and wash the gas-liquid two phases, a cyclone unit (1-5) converts the horizontal motion of the mixed materials into rotary motion, the centrifugal force is used for rapidly separating the gas-liquid two phases on line, the natural gas-washing water separation unit (1-6) separates the gas-liquid two phases by using the different positions of the gas-liquid two phases after passing through the cyclone unit in a pipeline, and the treated gas-liquid two phases respectively go forward to the next process flow through a solid line;
(4) Taking the liquid in the inlet high-efficiency scrubbing tank (3) in the step (2) as a circulating liquid, passing through a circulating water port C1, and re-injecting the circulating liquid into the compact online treatment device (1) through a pipeline circulating pump;
(5) Liquid in the inlet high-efficiency scrubbing tank (3) in the step (2) is discharged through a liquid outlet D1 or D2 after circulating liquid circulates for a period of time except for the liquid in the step (3), and fresh water is injected through a fresh water inlet E to replace high-salt water of a system clock;
(6) Draining and injecting water in the step (5), wherein the time of draining and injecting water in each time is operated according to the liquid level of the liquid level meter on site, and when the liquid level reaches 1/4 to 1/2 of the height of the liquid level meter, draining the liquid to the upper part and the lower part of the tangent line of the tank body end enclosure;
(7) The gas phase flowing into the inlet high-efficiency scrubbing tank (3) for high-efficiency liquid removal in the step (1) flows into a compressor after being treated by the inlet high-efficiency scrubbing tank (3), the removed liquid part is taken as circulating liquid to circulate in the system through a circulating water gap C2, and the part is discharged out of the system through a liquid discharge port D2;
(8) The gas phase flowing into the inlet high-efficiency scrubbing tank (3) for high-efficiency liquid removal in the step (7) sequentially flows through the inlet high-efficiency scrubbing tank (3): the device comprises an inertial separation distributor (3-4), a micro-cyclone (3-3), a fin separation module (3-1) and a fiber condensation module (3-2), wherein liquid carried in natural gas is efficiently removed;
(9) The liquid removed in the step (8) is collected at the bottom of the inlet high-efficiency scrubbing tank (3) through a downcomer (3-6);
(10) In the step (8), gas-liquid separation and gas uniform distribution are effectively realized by the units through which the natural gas sequentially passes, the inertial separation distributor (3-4) is coupled with a pressure gradient field by using a cyclone or centrifugal field to realize gas-liquid two-phase separation, the fin separation module (3-1) adopts a multilayer fin stacking mode to intercept and separate liquid, part of tiny liquid drops are coalesced and grown, and the fiber coalescence module (3-2) conducts special form weaving through fibers with different hydrophilic and hydrophobic properties to coalesce the liquid drops, wherein the separation precision is 15 mu m;
(11) And (3) the gas phase flowing into the compressor in the step (7) enters an outlet high-efficiency scrubbing tank (5) with the same structure as the inlet high-efficiency scrubbing tank (3) after passing through the compressor, the gas phase enters the next flow path after passing through the flow path the same as the inlet high-efficiency scrubbing tank (3), the liquid phase part is circulated as a circulating liquid through a circulating water port C2, the liquid phase part is discharged through a liquid discharge port D3, and the liquid discharge flow path is consistent with the inlet high-efficiency scrubbing tank (3).
The invention has the beneficial effects that:
(1) The method adopts the compact online treatment device (1) to wash the mined natural gas to remove soluble salt ions and pre-remove most of water, fundamentally solves the problems of pipeline scaling caused by the precipitation of soluble salt and eccentric vibration caused by the scaling of a compressor impeller, can remove more than 95 percent of soluble salt ions in the natural gas and efficiently remove more than 90 percent of water online.
(2) The inlet gas is subjected to deep liquid removal treatment by adopting the inlet high-efficiency scrubbing tank (3), the gas sequentially passes through the four-stage gas-liquid separation device, the classified and step-by-step liquid removal is realized, more than 99% of liquid entering the inlet gas can be removed, the liquid carrying amount of the gas entering the compressor is reduced to the maximum extent, the high-efficiency and stable operation of the compressor is maintained, and the operation period of the compressor is prolonged.
(3) The inlet gas is subjected to deep liquid removal treatment by adopting an outlet high-efficiency scrubbing tank (5), the gas sequentially passes through a four-stage gas-liquid separation device, graded and step-by-step liquid removal is realized, more than 99% of liquid entering the gas-liquid separation device can be removed, the generation of hydrates and acidic solutions is avoided, and the impact on subsequent pipelines, valves and other devices is reduced.
(4) Compared with the existing compressor front and back liquid removal treatment method of the platform, the improved treatment method reduces the occupied area of the device by 30-60 percent and improves the liquid receiving efficiency by 3-5 times.
Drawings
FIG. 1 is a flow diagram of the prior art compressor front and back scrubber tank liquid removal on a platform;
FIG. 2 is a flow chart of a natural gas deep purification treatment method of an offshore platform;
FIG. 3 is a diagram of a compact in-line processing apparatus;
FIG. 4 is a diagram of an inlet and outlet high efficiency scrubber tank assembly;
FIG. 5 is a sectional view of an inlet and outlet high-efficiency scrubber tank I-I.
Description of the symbols:
1 a compact on-line processing device; 2, a pipeline circulating pump; 3 an inlet high-efficiency scrubbing tank;
4, a compressor; 5 an outlet high-efficiency scrubbing tank;
1-1, a compact pipe body; 1-2 spray wash units; 1-3 umbrella-shaped gas-liquid uniform distribution units;
1-4 natural gas and washing water mixed mass transfer units; 1-5 constructing a rotary unit;
1-6 natural gas and washing water separation unit.
3-1 a fin separation module; 3-2 fiber aggregation module; 3-3 micro-cyclones;
3-4 inertial separation distributor; 3-5 liquid level meter; 3-6 downcomers.
Detailed Description
The present invention will be specifically described below by way of examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the invention by those skilled in the art based on the teachings herein are within the scope of the present invention.
As shown in fig. 2, the deep purification treatment method of natural gas on an offshore platform comprises the following steps:
(1) The produced natural gas enters the system from a gas phase inlet A, after being treated by the compact online treatment device (1), the gas phase flows into the inlet high-efficiency scrubbing tank (3) for high-efficiency liquid removal, and the removed liquid enters the inlet high-efficiency scrubbing tank (3);
(2) In the step (1), liquid in an inlet high-efficiency scrubbing tank (3) is used as circulating liquid and is re-injected into the compact online treatment device (1) from a circulating water port C1 through a pipeline circulating pump (2), in addition, after the circulating liquid circulates for a period of time, the liquid is discharged through a liquid discharge port D1 or D2, meanwhile, fresh water is injected through a fresh water port E, high salt water of a system clock is replaced, the time of each time of water discharge and water injection is operated according to the liquid level of a field liquid level meter, when the liquid level reaches 1/4 to 1/2 of the height of the liquid level meter, the liquid is discharged to the position above and below the tangent line of a tank head;
(3) The gas phase flowing into the inlet high-efficiency scrubbing tank (3) for high-efficiency liquid removal in the step (1) flows into the compressor (4) after being treated by the inlet high-efficiency scrubbing tank (3);
(4) The gas phase flowing into the compressor in the step (3) enters an outlet high-efficiency scrubbing tank (5) for treatment after passing through the compressor;
(5) And (5) treating the gas phase entering the outlet high-efficiency scrubbing tank (5) in the step (4) by the outlet high-efficiency scrubbing tank (5), then enabling the gas phase to enter the next process flow through a gas phase outlet B discharge system, enabling a removed liquid part to be used as circulating water through a circulating water port C2, enabling a part of the removed liquid to be discharged out of the system through a liquid discharge port D3, judging the liquid level height in the tank by observing the condition of a liquid level meter on the outlet high-efficiency scrubbing tank (5), discharging liquid when the liquid level height reaches 1/4 to 1/2 of the height of the liquid level meter, and discharging the liquid to the upper part and the lower part of a tangent line of a tank body end enclosure.
The compact online processing device comprises the following parts: the device comprises a compact pipe body (1-1), a spray washing unit (1-2), an umbrella-shaped gas-liquid uniform distribution unit (1-3), a natural gas and washing water mixed mass transfer unit (1-4), a rotation making unit (1-5) and a natural gas and washing water separation unit (1-6).
The inlet high-efficiency scrubbing tank (3) and the outlet high-efficiency scrubbing tank (5) have the same internal component form and comprise the following parts: the device comprises a fin separation module (3-1), a fiber agglomeration module (3-2), a micro-cyclone (3-3), an inertial separation distributor (3-4), a liquid level meter (3-5) and a downcomer (3-6).
The compact online treatment device (1) can remove more than 95% of soluble salt ions in natural gas and efficiently remove more than 90% of water online.
The inlet high-efficiency scrubbing tank (3) and the outlet high-efficiency scrubbing tank (5) can remove more than 99% of liquid entering the inlet high-efficiency scrubbing tanks.
The fin separation module (3-1) adopts a multilayer fin stacking mode to intercept and separate liquid and coalesce and grow partial micro liquid drops; the fiber aggregation module (3-2) weaves the fibers with different hydrophilicity and hydrophobicity in a specific form to aggregate the liquid drops, and the separation precision is 15 mu m; the micro-cyclone (3-3) adopts the technology of gas-liquid two-phase separation by coupling the cyclone or centrifugal field with the pressure gradient field introduced in the patent of a device for degassing liquid by coupling the cyclone or centrifugal field with the pressure gradient field (CN 103071318B); the inertial separation distributor (3-4) uses a gas-liquid inertial separation distributor introduced in a gas-liquid inertial separation and distribution coupling unit and a separator applying the inertial separation and distribution coupling unit (CN 102671502B), and effectively realizes the functions of gas-liquid separation and uniform gas distribution; the liquid level meter (3-5) can be set as an on-site liquid level meter or a remote liquid level meter to observe the liquid receiving condition in the high-efficiency washing tank, so that the liquid level in the high-efficiency washing tank can be conveniently controlled; the downcomers (3-6) are a plurality of downcomers which are respectively connected with the underflow ports of the micro cyclones (3-3) and are connected with and penetrate through the bottom supporting plates of the fin separation modules (3-1) and the fiber condensation modules (3-2), so that liquid separated by the micro cyclones (3-3), the fin separation modules (3-1) and the fiber condensation modules (3-2) can be collected to the bottom of the high-efficiency scrubbing tank through the downcomers.
Example 1
The inventor of the application finds that the compressor of the offshore gas field is often scaled, and the compressor is eccentric due to uneven scaling, and the eccentricity is more and more serious with the increasing severity of scaling, so that the compressor is stopped due to strong vibration of the compressor, and the normal production of the offshore gas field platform is seriously influenced. The analysis shows that the phenomenon is that mineral salts in the underground gas reservoir can be dissolved in formation water under the conditions of high temperature and high pressure at the ground bottom, and the high mineralized water and natural gas can be distributed in gaps of the gas reservoir together. After the gas reservoir is developed, the natural gas continuously moves to the shaft from the pores, and the high-salinity water with the mineral salts dissolved in the natural gas is carried out of the ground by the natural gas in the process. The existing front and back liquid removal treatment process of the compressor is shown in figure 1, only an inlet gas scrubbing tank is adopted for removing liquid from the exploited natural gas, a cyclone is arranged in the inlet gas scrubbing tank for removing liquid, and part of the inlet gas scrubbing tank is provided with a wire mesh demister. Meanwhile, the natural gas entrained liquid can also generate hydrate and form strong corrosive acid gas, which generates physical impact on a conveying pipeline, a valve on the pipeline, an instrument and the like and influences the transportation of normal production. Therefore, an offshore platform natural gas deep purification treatment method is designed. The method comprises the steps of washing and desalting the mined natural gas through a compact online treatment device, removing most of water on line, performing efficient liquid removal by using an inlet efficient scrubbing tank, improving the running period of a compressor, performing efficient liquid removal by using an outlet efficient scrubbing tank, and ensuring that the production and transportation cannot be adversely affected by precipitation of hydrates, corrosive acidic solutions and salt ions in subsequent process flows, pipelines, valves, instruments and the like.
As shown in fig. 2, it mainly includes: a compact online processing device 1; a pipeline circulating pump 2; an inlet high-efficiency scrubbing tank 3; a compressor 4; the outlet high-efficiency scrubber tank 5 is shown in fig. 5 as a sectional view of the inlet high-efficiency scrubber tank and the outlet high-efficiency scrubber tank I-I. The external dimensions and internal components of the inlet and outlet high-efficiency scrubbing tanks are designed according to the actual production capacity of the gas field, the actual gas composition, the operating conditions and other factors.
As shown in fig. 3, the compact online processing apparatus mainly includes: a compact pipe body 1-1; a spray washing unit 1-2; 1-3 of umbrella-shaped gas-liquid uniform distribution units; 1-4 mass transfer units mixed by natural gas and washing water; a rotation making unit 1-5; natural gas and washing water separation units 1-6.
As shown in fig. 4, the inlet and outlet high-efficiency scrubber tanks mainly include: a fin separation module 3-1; a fiber aggregation module 3-2; 3-3 of a micro cyclone; 3-4 of an inertial separation distributor; 3-5 parts of a liquid level meter; downcomers 3-6.
Some production parameters for a field are as follows:
the produced natural gas enters the system from a gas phase inlet A, and the gas velocity range of the gas phase inlet A is 2-40 m/s. After being treated by the compact online treatment device (1), the gas phase flows into the inlet high-efficiency scrubbing tank (3) for high-efficiency liquid removal, and the removed liquid enters the inlet high-efficiency scrubbing tank (3) as a circulating liquid and is injected into natural gas through the spray scrubbing unit again by the pipeline circulating pump (2). And discharging liquid when the height of the liquid level meter is 1/2, stopping discharging to the tangent position of the end socket, and simultaneously injecting fresh water to replace high-salt water in the system. The low-salt natural gas treated by the compact online treatment device (1) enters an inlet high-efficiency scrubbing tank (3), gas phase flows into a compressor, liquid is collected at the bottom of the inlet high-efficiency scrubbing tank (3) through a down-flow pipe (3-6), part of the low-salt natural gas is circulated in the system as circulating liquid through a circulating water port C1, part of the low-salt natural gas is discharged out of the system through a liquid discharge port D2, the height of the liquid level in the inlet high-efficiency scrubbing tank (3) is judged by observing a liquid level meter (4-5), liquid is discharged when the height reaches 1/4 to 1/2 of the height of the liquid level meter, liquid is discharged through the liquid discharge port D2, and the liquid is stopped when being discharged to the upper part and the lower part of the tangent position of a tank body end socket. The natural gas after passing through the compressor enters an outlet high-efficiency scrubbing tank (5) to be subjected to deep dehydration treatment, the gas phase enters the next process flow, liquid is collected at the bottom of the outlet high-efficiency scrubbing tank (5) through a downcomer, part of the liquid is circulated in the system as circulating liquid through a circulating water gap C1, part of the liquid is discharged out of the system through a liquid discharge port D3, the height of the liquid level in the outlet high-efficiency scrubbing tank (5) is judged by observing a liquid level meter, liquid discharge is carried out when the height reaches 1/4 to 1/2 of the height of the liquid level meter, liquid discharge is carried out through a liquid discharge port D3, and the liquid discharge is stopped when the liquid discharge reaches the position of a tangent line of a tank body end socket.
When the method is used for carrying out deep treatment and purification on the natural gas of the offshore platform, the compressor can stably run for 1 year without scaling phenomenon, and the subsequent pipelines, valves and instruments are not physically damaged due to the precipitation of soluble salts, the formation of hydrates and the formation of strong corrosive acid solutions.
Compared with the original treatment method, the improved treatment method reduces the floor area of the device by 30-60 percent and improves the liquid receiving efficiency by 3-5 times.
Claims (6)
1. The deep purification treatment method of the natural gas on the offshore platform is characterized by comprising the following steps:
(1) The produced natural gas enters the system from a gas phase inlet A, after being treated by the compact online treatment device (1), the gas phase flows into the inlet high-efficiency scrubbing tank (3) for high-efficiency liquid removal, and the removed liquid enters the inlet high-efficiency scrubbing tank (3);
(2) In the step (1), liquid in an inlet high-efficiency scrubbing tank (3) is used as circulating liquid and is re-injected into the compact online treatment device (1) from a circulating water port C1 through a pipeline circulating pump (2), in addition, after the circulating liquid circulates for a period of time, the liquid is discharged through a liquid discharge port D1 or D2, meanwhile, fresh water is injected through a fresh water port E, high salt water of a system clock is replaced, the time of each time of water discharge and water injection is operated according to the liquid level of a field liquid level meter, when the liquid level reaches 1/4 to 1/2 of the height of the liquid level meter, the liquid is discharged to the position above and below the tangent line of a tank head;
(3) The gas phase flowing into the inlet high-efficiency scrubbing tank (3) for high-efficiency liquid removal in the step (1) flows into the compressor (4) after being treated by the inlet high-efficiency scrubbing tank (3);
(4) The gas phase flowing into the compressor in the step (3) enters an outlet high-efficiency scrubbing tank (5) for treatment after passing through the compressor;
(5) And (4) treating the gas phase entering the outlet high-efficiency scrubbing tank (5) in the step (4) by the outlet high-efficiency scrubbing tank (5), then enabling the gas phase to enter the next process flow through a gas phase outlet B discharge system, enabling the removed liquid part to be used as circulating water through a circulating water port C2, enabling the removed liquid part to be discharged out of the system through a liquid discharge port D3, judging the liquid level height in the tank by observing the condition of a liquid level meter on the outlet high-efficiency scrubbing tank (5), discharging liquid when the liquid level height reaches 1/4 to 1/2 of the height of the liquid level meter, and discharging the liquid to the position above and below the tangent line of a tank body end socket.
2. The process according to claim 1, wherein the gas velocity of the gas phase inlet A is in the range of 2 to 40m/s.
3. The method of claim 1, wherein the compact in-line processing apparatus comprises: the device comprises a compact pipe body (1-1), a spray washing unit (1-2), an umbrella-shaped gas-liquid uniform distribution unit (1-3), a natural gas and washing water mixed mass transfer unit (1-4), a rotation making unit (1-5) and a natural gas and washing water separation unit (1-6).
4. The method according to claim 1, characterized in that the inlet high-efficiency scrubber tank (3) and the outlet high-efficiency scrubber tank (5) have the same internal component form, comprising the following sections: the device comprises a fin separation module (3-1), a fiber agglomeration module (3-2), a micro-cyclone (3-3), an inertial separation distributor (3-4), a liquid level meter (3-5) and a downcomer (3-6).
5. The method according to claim 1, characterized in that the compact online treatment device (1) can remove more than 95% of soluble salt ions in natural gas and perform online high-efficiency removal on more than 90% of water.
6. The method of claim 1, wherein the inlet high-efficiency scrubber tank (3) and the outlet high-efficiency scrubber tank (5) remove more than 99% of the liquid entering them.
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| CN104673417A (en) * | 2015-02-16 | 2015-06-03 | 上海鑫兴化工科技有限公司 | System and method for precooling, drying and purifying coal-based natural gas |
| CN104667683A (en) * | 2013-11-29 | 2015-06-03 | 华东理工大学 | Graded purification device and graded purification method for dusty gas |
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| CN102620524A (en) * | 2012-04-16 | 2012-08-01 | 上海交通大学 | Cascade type natural gas pressurized liquefaction process with sublimation removal of CO2 |
| CN104667683A (en) * | 2013-11-29 | 2015-06-03 | 华东理工大学 | Graded purification device and graded purification method for dusty gas |
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