CN110343556A - Skid-mounted carbon dioxide flooding returns exhaust gas desulfurization dehydration and carbon dioxide recovery system, in accordance - Google Patents

Abstract

The invention provides a skid-mounted carbon dioxide drive-back exhaust gas desulfurization dehydration and carbon dioxide recovery system, which comprises a return gas pretreatment and desulfurization skid block, a cold drying skid block, a compressor membrane feeding skid block, a membrane separation skid block, Carbon dioxide pressurization reinjection skid block; cold-drying skid block is connected with return exhaust gas pretreatment and desulfurization skid block; compressor membrane feed block is connected with cold-drying skid block; membrane separation skid block is communicated with compressor film feed block; The carbon dioxide pressurized re-injection skid is connected to the membrane separation skid; wherein, the return exhaust gas enters the return exhaust gas pretreatment and desulfurization skid for pretreatment and desulfurization, and then enters the cold-drying skid for dehydration treatment. The returned exhaust gas enters the compressor and the membrane inlet skid block is pressurized, and the pressurized return exhaust gas enters the membrane separation skid block for gas separation. The skid-mounted carbon dioxide drive-back exhaust gas desulfurization dehydration and carbon dioxide recovery system of the present invention has a skid-mounted design, is convenient for installation and operation, and facilitates the treatment of the returned exhaust gas with a small amount of gas.

Description

Skid-mounted carbon dioxide drive back exhaust gas desulfurization dehydration and carbon dioxide recovery system

technical field

The invention relates to the field of carbon dioxide recovery, in particular to a skid-mounted carbon dioxide drive-back exhaust gas desulfurization dehydration and carbon dioxide recovery system.

Background technique

With the large-scale promotion of CO2 flooding tertiary oil recovery technology, the surface process of CO2 flooding produced fluid faces some difficulties: after carbon dioxide is injected into the ground, about 50% to 60% is permanently stored underground, and the remaining 40% to 50% Then it overflows with the backflow of oilfield produced fluid. Since the blowback gas of the produced liquid from carbon dioxide flooding contains a lot of CO ₂ , the blowback gas of the produced liquid from carbon dioxide flooding cannot enter the gathering pipeline network or be ignited without necessary treatment, and can only be discharged directly, which not only pollutes It also wastes natural gas and CO ₂ resources, and reduces the effect of carbon dioxide flooding and storage. The recovery and utilization of CO ₂ in the return gas of the CO ₂ flooding produced fluid in the oil field can not only protect the environment, but also utilize resources and improve economic benefits. It will be a trend of China's future development to rationally recycle and utilize the backflow gas resources of CO ₂ flooding produced fluid.

For single-well CO ₂ flooding projects, the amount of gas returned in the produced fluid is small, and the traditional amine method for desulfurization and decarbonization requires large investment, high operating cost, and is uneconomical.

SUMMARY OF THE INVENTION

In view of the problems existing in the background technology, the purpose of the present invention is to provide a skid-mounted carbon dioxide drive-back exhaust gas desulfurization dehydration and carbon dioxide recovery system, which can process the return exhaust gas and separate carbon dioxide from natural gas, thereby effectively utilizing Natural gas, recovering carbon dioxide, and adopting a skid-mounted design, it is convenient to process the return exhaust gas with small gas volume and reduce the processing cost of the return exhaust gas.

In order to achieve the above object, the present invention provides a skid-mounted carbon dioxide drive-back exhaust gas desulfurization dehydration and carbon dioxide recovery system, which includes a return gas pretreatment and desulfurization skid, a cold-drying skid, a compressor film feeding skid, Membrane separation skid block, carbon dioxide pressurized reinjection skid block. The cold-drying skid block is connected with the return gas pretreatment and desulfurization block through pipelines; the compressor membrane inlet skid block and the cold-drying skid block are connected through pipelines; the membrane separation skid block and the compressor film-inlet skid block are connected through pipelines ; The carbon dioxide pressurized reinjection skid block and the membrane separation skid block are communicated through pipelines. Among them, the return exhaust gas first enters the return exhaust gas pretreatment and desulfurization skid for pretreatment and desulfurization, and the return exhaust gas after the pretreatment and desulfurization enters the cold drying skid for dehydration treatment in the cold drying skid. The treated return exhaust gas enters the compressor into the membrane feed block to be pressurized, and the pressurized return exhaust gas enters the membrane separation block for gas separation to separate carbon dioxide and hydrocarbon gases, and the separated carbon dioxide enters The carbon dioxide pressurized re-injection sled is used for pressurized re-injection treatment, and the hydrocarbon gas is used as natural gas.

In one embodiment, the return gas pretreatment and desulfurization skid block includes a first gas-liquid separator, a first particle filter, an activated carbon tower, and at least a first-stage desulfurization tower.

The first gas-liquid separator includes: an inlet of the first gas-liquid separator; a first outlet of the first gas-liquid separator; and a second outlet of the first gas-liquid separator, which is used to communicate with an external sewage tank.

The first particle filter includes: a first particle filter inlet, which is connected to the first outlet of the first gas-liquid separator; a first outlet of the first particle filter; and a second outlet of the first particle filter, which is used to communicate with the external sewage tank.

The activated carbon tower comprises: the inlet of the activated carbon tower, which is connected to the first outlet of the first particle filter; the first outlet of the activated carbon tower; and the second outlet of the activated carbon tower, which is used to communicate with the external sewage pool.

The first-stage desulfurization tower includes: the inlet of the first-stage desulfurization tower is connected to the first outlet of the activated carbon tower; the first outlet of the first-stage desulfurization tower is connected to the cold drying skid; the second outlet of the first-stage desulfurization tower is used to connect to the external sewage pool.

Wherein, the return gas enters the first gas-liquid separator through the inlet of the first gas-liquid separator for gas-liquid separation and forms separated gas and liquid, and the liquid enters the sewage tank through the second outlet of the first gas-liquid separator; the separated gas Through the first outlet of the first gas-liquid separator and the inlet of the first particle filter, it enters the first particle filter for filtration, so as to filter the solid impurity particles mixed in the separated gas for the first time, and the filtered solid impurity particles pass through the first particle filter. The second outlet of the particle filter is discharged into the sewage tank, and the filtered separated gas enters the activated carbon tower through the first outlet of the first particle filter and the inlet of the activated carbon tower to remove heavy hydrocarbons, and the removed heavy hydrocarbons pass through the activated carbon tower. The second outlet is discharged into the sewage tank, and the separated gas from the heavy hydrocarbons is at least partially entered into the first-stage desulfurization tower through the first outlet of the activated carbon tower and the inlet of the first-stage desulfurization tower for desulfurization, and the removed sulfur-containing sewage passes through the first-stage desulfurization tower. The second outlet flows into the sewage tank, and the separated gas after desulfurization flows into the cold drying skid block through the first outlet of the desulfurization tower for the next operation.

In one embodiment, the return gas pretreatment and desulfurization skid further includes a secondary desulfurization tower, and the secondary desulfurization tower includes: an inlet of the secondary desulfurization tower, which is connected to the first outlet of the activated carbon tower and the first outlet of the primary desulfurization tower; two The first outlet of the first-stage desulfurization tower is connected to the cold-drying skid block; the second outlet of the second-stage desulfurization tower is used to connect to the external sewage pool. Wherein, at least part of the separated gas discharged through the first outlet of the activated carbon tower enters the secondary desulfurization tower through the inlet of the secondary desulfurization tower for desulfurization treatment, and the separated gas discharged through the first outlet of the primary desulfurization tower passes through the inlet of the secondary desulfurization tower again. Enter into the secondary desulfurization tower for secondary desulfurization, the separated gas after desulfurization flows into the cold drying skid through the first outlet of the secondary desulfurization tower, and the sulfur-containing sewage removed by the secondary desulfurization tower passes through the second desulfurization tower. The second outlet flows into the sewage pool.

In one embodiment, the return gas pretreatment and desulfurization skid block further includes: a shut-off valve, which is arranged on the upstream pipeline of the inlet of the first gas-liquid separator, and is used to control the flow of the upstream pipeline of the inlet of the first gas-liquid separator. Open and closed.

In one embodiment, the refrigerated drying skid includes a refrigerated dryer, a second gas-liquid separator, and a second particle filter.

The refrigerating machine includes: an inlet of the refrigerating machine, which is connected to the first outlet of the primary desulfurization tower and the first outlet of the secondary desulfurizing tower; the first outlet of the refrigerating machine;

The second gas-liquid separator includes: the inlet of the second gas-liquid separator, which is connected to the first outlet of the refrigerating machine; the first outlet of the second gas-liquid separator; and the second outlet of the second gas-liquid separator, which is used to communicate with the external sewage tank .

The second particulate filter includes: an inlet of the second particulate filter, which is connected to the first outlet of the second gas-liquid separator; a first outlet of the second particulate filter, which is connected to the compressor feeding membrane block; the second outlet of the second particulate filter , used to connect the external sewage pool.

Wherein, the desulfurized separated gas discharged from the primary desulfurization tower and the secondary desulfurization tower enters the cold dryer through the inlet of the cold dryer for dehydration treatment, and the dehydrated separated gas passes through the first outlet of the cold dryer and the second gas-liquid The inlet of the separator enters the second gas-liquid separator for gas-liquid separation, and the separated gas enters the second particle filter through the first outlet of the second gas-liquid separator and the inlet of the second particle filter to further remove the gas The solid impurity particles in the filter are discharged into the sewage tank, and the gas filtered by the second particle filter flows into the compressor membrane feeder block through the first outlet of the second particle filter for further operation. .

In one embodiment, the compressor feed skid includes a first compressor. The first compressor includes: the first compressor inlet, which is connected to the first outlet of the second particle filter; the first outlet of the first compressor; and the second outlet of the first compressor, which is used for connecting to the external sewage tank. Wherein, the gas discharged through the first outlet of the second particulate filter enters the first compressor through the first compressor inlet, the gas is compressed and pressurized by the first compressor, and then enters the membrane through the first outlet of the first compressor Separate sleds for further operations.

In one embodiment, the membrane separation skid includes a filter assembly, an electric heater, a primary membrane tube, and a secondary membrane tube.

The filter assembly includes a third particulate filter and a fourth particulate filter disposed in sequence downstream of the first outlet of the first compressor. The third particle filter includes: an inlet of the third particle filter, which is connected to the first outlet of the first compressor; a first outlet of the third particle filter; and a second outlet of the third particle filter, which is used to communicate with the external sewage tank. The fourth particle filter includes: a fourth particle filter inlet, which is connected to the first outlet of the third particle filter; a first outlet of the fourth particle filter; and a second outlet of the fourth particle filter, which is used to communicate with the external sewage tank.

The electric heater includes: an inlet of the electric heater, which is communicated with an outlet of the fourth particle filter; and an outlet of the electric heater.

The primary membrane tube comprises: the inlet of the primary membrane tube, which is connected to the outlet of the electric heater; the low pressure outlet of the primary membrane tube, which is communicated with the inlet of the first compressor; and the high pressure outlet of the primary membrane tube.

The secondary membrane tube includes: the inlet of the secondary membrane tube, which is connected to the high-pressure outlet of the primary membrane tube; the low-pressure outlet of the secondary membrane tube, which is connected to the carbon dioxide pressurized reinjection skid block; and the high-pressure outlet of the secondary membrane tube, which is used to communicate with the external natural gas pipeline.

Among them, the pressurized gas discharged through the first outlet of the first compressor enters the third particle filter and the fourth particle filter in turn for filtration, and the filtered gas enters the electric heater through the inlet of the electric heater for gasification. Chemical treatment, and then discharged through the outlet of the electric heater. The discharged gas first undergoes primary separation treatment in the primary membrane tube, and then enters the secondary membrane tube for secondary separation and separates carbon dioxide and hydrocarbon gases in the gas. The outgoing carbon dioxide enters the carbon dioxide pressurization and reinjection skid through the low-pressure outlet of the secondary membrane tube; the separated hydrocarbon gas directly enters the external natural gas pipeline.

In one embodiment, the membrane separation skid block further includes a second gas analyzer, wherein the primary membrane tube low pressure outlet, the primary membrane tube high pressure outlet, the secondary membrane tube low pressure outlet, and the secondary membrane tube high pressure outlet are respectively connected to Second gas analyzer.

In one embodiment, the number of compressor membrane feeding skids is set to two; correspondingly, the number of membrane separation skids is set to two, each membrane separation skid is connected to the two compressor membrane feeding skids respectively, and each membrane is separated. The skid is in communication with the carbon dioxide pressurized reinjection skid.

In one embodiment, the carbon dioxide booster re-injection block includes a second compressor, and the second compressor includes: a second compressor inlet; a first outlet of the second compressor for discharging carbon dioxide; The second outlet is used to connect the external sewage pool. Wherein, the gas separated from the low-pressure outlet of the secondary membrane tube of the secondary membrane tube of each membrane separation block enters the second compressor for compression from the inlet of the second compressor, and the compressed carbon dioxide passes through the first outlet of the second compressor. Drain for further processing.

The beneficial effects of the present invention are as follows:

In the skid-mounted carbon dioxide drive back exhaust gas desulfurization dehydration and carbon dioxide recovery system according to the present invention, the carbon dioxide drive back exhaust gas passes through the return exhaust gas pretreatment and desulfurization The separation skid and carbon dioxide pressurization and reinjection skid treatment form the steps of pretreatment, desulfurization, cold-drying dehydration, pressurization, and membrane decarburization for the return gas, which effectively removes carbon dioxide and hydrocarbons in the return gas. The gas (natural gas) is separated and extracted, so that the carbon dioxide in the return gas can be recovered and effectively used, avoiding direct emission into the atmosphere and polluting the environment, and the extracted natural gas is used for fuel combustion to prevent the waste of energy; in addition, this The skid-mounted carbon dioxide drive-back exhaust gas desulfurization dehydration and carbon dioxide recovery system of the invention has a skid-mounted and modular design, which makes the system simple, easy to install and operate, facilitates the treatment of the return exhaust gas with a small amount of gas, and reduces the treatment of the return exhaust gas. cost.

Description of drawings

FIG. 1 is a skid-mounted carbon dioxide drive-back exhaust gas desulfurization dehydration and carbon dioxide recovery system according to the present invention.

Among them, the reference numerals are described as follows:

A return exhaust gas pretreatment and desulfurization skid block 20A first compressor inlet

11 The first gas-liquid separator 20B1 The first outlet of the first compressor

11A first gas-liquid separator inlet 20B2 first compressor second outlet

11B1 The first outlet of the first gas-liquid separator D membrane separation skid

21 Filter components

11B2 The second outlet of the first gas-liquid separator 211 The third particle filter

211A Third Particulate Filter Inlet

12 First particle filter

12A First particle filter inlet 211B1 Third particle filter first outlet

12B1 1st particle filter 1st outlet

211B2 third particle filter second outlet

12B2 First particle filter second outlet

212 Fourth Particulate Filter

13 First stage desulfurization tower 212A fourth particle filter inlet

13A primary desulfurization tower inlet

13B1 The first outlet of the first stage desulfurization tower 212B1 The first outlet of the fourth particle filter

The second outlet of 13B2 first-stage desulfurization tower

14 Secondary desulfurization tower 212B2 The second outlet of the fourth particle filter

14A secondary desulfurization tower inlet

14B1 The first outlet of the secondary desulfurization tower 22 Electric heater

14B2 secondary desulfurization tower second outlet 22A electric heater inlet

15 flow meter 22B electric heater outlet

B cold drying skid block 23 primary film tube

16 Refrigeration dryer 23A first-stage membrane tube inlet

16A cold dryer inlet 23B1 first-stage membrane tube low pressure outlet

16B1 The first outlet of the refrigerated dryer 23B2 The high pressure outlet of the first-stage membrane tube

16B2 Second outlet of refrigerated dryer 24 Secondary membrane tube

17 Second gas-liquid separator 24A secondary membrane tube inlet

17A second gas-liquid separator inlet 24B1 second stage membrane tube low pressure outlet

17B1 The first outlet of the second gas-liquid separator 24B2 The high pressure outlet of the secondary membrane tube

25 Second Gas Analyzer

17B2 The second outlet of the second gas-liquid separator E carbon dioxide pressurized reinjection skid

26 Second compressor

18 Second Particulate Filter 26A Second Compressor Inlet

18A Second Particulate Filter Inlet 26B1 Second Compressor First Outlet

18B1 The first outlet of the second particle filter 26B2 The second outlet of the second compressor

27 Activated carbon tower

18B2 second particle filter second outlet 27A activated carbon tower inlet

27B1 activated carbon tower first outlet

19 The first gas analyzer 27B2 The second outlet of the active tower

C compressor film feed block 28 shut-off valve

20 First compressor

Detailed ways

Referring to Fig. 1, the skid-mounted carbon dioxide drive-back exhaust gas desulfurization dehydration and carbon dioxide recovery system according to the present invention includes a return gas pretreatment and desulfurization skid block A, a cold-drying skid block B, a compressor film feeding skid block C, and a membrane separation block. Skid block D, carbon dioxide pressurized reinjection skid block E. The cold-drying skid block B is connected with the return gas pretreatment and desulfurization block A through pipelines; the compressor membrane inlet skid block C is connected with the cold-drying skid block B through pipelines; the membrane separation skid block D is connected with the compressor membrane entry skid Block C is connected through pipelines; carbon dioxide pressurized reinjection skid block E and membrane separation skid block D are connected through pipelines; wherein, the return exhaust gas first enters the return exhaust gas pretreatment and desulfurization skid block A for pretreatment and desulfurization, and then The return exhaust gas after pretreatment and desulfurization enters the cold-drying block B for dehydration treatment in the cold-drying block B, and the return exhaust gas after the dehydration treatment enters the compressor feeding block C to be pressurized. The pressurized return exhaust gas enters the membrane separation skid D for gas separation to separate carbon dioxide and hydrocarbon gases, and the separated carbon dioxide enters the carbon dioxide pressurized reinjection skid E for pressurization and reinjection treatment, and the hydrocarbon gas is used as the natural gas use. In one embodiment, the blowback gas comes from the top outlet of a three-phase separator (not shown) at the wellhead of a carbon dioxide flooding well.

It should be noted that the skid block is the skid-mounted equipment, which is to assemble equipment (gas-liquid separator, particle separator, compressor, desulfurization tower, etc.), pipelines, valves, instruments, etc. On the structural base, it becomes a whole device, which can realize a certain function independently, completely and accurately. The manufacture and assembly of the skid blocks can be carried out in the factory, and after prefabrication, they are transported to the site for installation.

In the skid-mounted carbon dioxide drive-back exhaust gas desulfurization dehydration and carbon dioxide recovery system according to the present invention, the carbon dioxide drive-back exhaust gas passes through the return exhaust gas pretreatment and desulfurization skid block A, the cold drying block B, and the compressor feeding into the film block. C. Membrane separation skid D, carbon dioxide pressurized reinjection skid E treatment, forming the steps of pretreatment, desulfurization, cold-drying dehydration, pressurization, and membrane decarburization for the return exhaust gas, which effectively displaces the return exhaust gas. The carbon dioxide and hydrocarbon gas (natural gas) are separated and extracted, so that the carbon dioxide in the return gas can be recovered and effectively used, avoiding direct emission into the atmosphere and polluting the environment, and the extracted natural gas is used for fuel combustion, preventing energy consumption. waste; in addition, compared with the traditional on-site installation equipment that needs to go through equipment procurement, on-site installation and debugging, the skid-mounted carbon dioxide repulsion exhaust gas desulfurization dehydration and carbon dioxide recovery system of the present invention is skid-mounted and modularized design makes the system simple , Easy installation and operation, only need to install and debug between the skid blocks, which reduces the construction cost on site, greatly reduces the amount of construction work involved in the process of returning and exhausting, and the design of the skid blocks has problems in the system. When it is installed, it is only necessary to carry out maintenance and debugging for the corresponding skid block, without the need for inspection and maintenance of the entire system, which improves the stability and reliability of the system movement, facilitates the maintenance and management of the system, and reduces the operating cost of the equipment; moreover, When the blowback gas comes from a single-well CO ₂ flooding project, the gas volume of the blowback gas is small. If the traditional amine method is used for desulfurization and decarbonization, the investment is large, the operation cost is high, and it is not economical. The system facilitates the treatment of the return exhaust gas with a small amount of air, thereby reducing the treatment cost of the return exhaust gas.

It should be noted that the blowback gas from the top outlet of the three-phase separator at the wellhead of the carbon dioxide flooding well is mainly composed of hydrocarbons such as methane, and often contains acidic substances such as hydrogen sulfide. In the process of gas transportation, it is easy to cause corrosion and blockage of the pipeline. In addition, if there is sulfide mixed in the return exhaust gas, when the membrane method is used to separate carbon dioxide from the return exhaust gas, the existence of sulfide will cause the membrane tube to be unable to separate carbon dioxide. However, hydrogen sulfide is toxic and harmful, and the content of hydrogen sulfide in the natural gas standard stipulated by the state should be less than a certain value (20mg/Nm3). Therefore, due to the above reasons, the return gas needs desulfurization treatment; in addition, the return gas also contains oilfield chemicals, Many liquid and solid impurities such as particulate matter, these liquid or solid impurities will have a serious adverse effect on the performance of the membrane (first-stage membrane tube and second-stage membrane tube) during subsequent decarburization by membrane method. Before the decarburization method, the return gas needs to be pretreated, dehydrated, and solid impurities removed.

The return gas pretreatment and desulfurization skid block A includes a first gas-liquid separator 11, a first particle filter 12, an activated carbon tower 27, and at least one-stage desulfurization tower.

The first gas-liquid separator 11 includes: an inlet 11A of the first gas-liquid separator; a first outlet 11B1 of the first gas-liquid separator; and a second outlet 11B2 of the first gas-liquid separator for communicating with an external sewage tank.

The first particle filter 12 includes a first particle filter inlet 12A, which communicates with a first outlet 11B1 of the first gas-liquid separator; a first outlet 12B1 of the first particle filter; and a second outlet 12B2 of the first particle filter, which communicates with External sewage pool.

The activated carbon tower 27 includes: an activated carbon tower inlet 27A, which is connected to the first outlet 12B1 of the first particle filter; a first activated carbon tower outlet 27B1;

The first-stage desulfurization tower 13 includes: the first-stage desulfurization tower inlet 13A, which is connected to the first outlet 27B1 of the activated carbon tower; the first-stage desulfurization tower's first outlet 13B1 is connected to the cold drying block B; External sewage pool.

The return gas enters the first gas-liquid separator 11 through the first gas-liquid separator inlet 11A for gas-liquid separation and forms separated gas and liquid (sewage and oil), and the liquid passes through the second outlet of the first gas-liquid separator 11B2 flows into the sewage tank; the separated gas enters the first particle filter 12 through the first outlet 11B1 of the first gas-liquid separator and the first particle filter inlet 12A for filtration, so as to filter the solid impurity particles mixed in the separated gas for the first time. Filtration, the filtered solid impurity particles are discharged into the sewage tank through the second outlet 12B2 of the first particle filter, and the filtered separated gas enters the activated carbon tower 27 through the first outlet 12B1 of the first particle filter and the activated carbon tower inlet 27A. The heavy hydrocarbons removed are discharged into the sewage tank through the second outlet 27B2 of the activated carbon tower, and the separated gas from the heavy hydrocarbons is at least partially removed through the first outlet 27B1 of the activated carbon tower and the inlet 13A of the primary desulfurization tower. Desulfurization is carried out in the first stage desulfurization tower 13, the removed sulfur-containing sewage flows into the sewage tank through the second outlet 13B2 of the first stage desulfurization tower, and the separated gas after desulfurization flows into the cold drying skid block B through the first outlet 13B1 of the desulfurization tower, to proceed to the next step.

The setting of the first gas-liquid separator 11 effectively performs preliminary separation of chemicals, at least part of heavy hydrocarbons and other liquids in the return gas, while the first particulate filter 12 effectively removes the solid impurity particles mixed in the return gas. The first filtration is carried out; the first-stage desulfurization tower 13 can remove sulfides such as hydrogen sulfide in the return gas. The first gas-liquid separator 11, the first particle filter 12, the activated carbon tower 27 and the first-stage desulfurization tower 13 realize the pretreatment of the return gas, which is convenient for subsequent removal of carbon dioxide by membrane separation.

Preferably, in one embodiment, the return gas pretreatment and desulfurization skid block A further includes a secondary desulfurization tower 14, and the secondary desulfurization tower 14 includes: an inlet 14A of the secondary desulfurization tower, which is connected to the first outlet 27B1 of the activated carbon tower, a The first outlet 13B1 of the secondary desulfurization tower; the first outlet 14B1 of the secondary desulfurization tower is connected to the cold drying skid block B; the second outlet of the secondary desulfurization tower 14B2 is used to connect to the external sewage pool.

Wherein, at least part of the separated gas discharged through the first outlet 27B1 of the activated carbon tower enters the secondary desulfurization tower 14 through the secondary desulfurization tower inlet 14A for desulfurization treatment, and the separated gas discharged through the first outlet 13B1 of the primary desulfurization tower passes through the secondary desulfurization tower. The desulfurization tower inlet 14A enters the secondary desulfurization tower 14 again for secondary desulfurization, and the desulphurized separated gas flows into the cold drying skid B through the first outlet 14B1 of the secondary desulfurization tower, while the desulphurized gas removed by the secondary desulfurization tower 14. The sulfur-containing sewage flows into the sewage tank through the second outlet 14B2 of the secondary desulfurization tower. In one embodiment, the primary desulfurization tower 13 and the secondary desulfurization tower 14 are respectively equipped with a large sulfur-capacity ferric oxyhydroxide desulfurizing agent, and the setting of the secondary desulfurization tower 14 can ensure that the return exhaust gas is fully removed sulfide, etc. acid gas, and the secondary desulfurization tower inlet 14A of the secondary desulfurization tower 14 is connected to the first outlet 27B1 of the activated carbon tower, and is in a parallel relationship with the primary desulfurization tower 13, which improves the desulfurization efficiency; in addition, the secondary desulfurization of the secondary desulfurization tower 14 The tower inlet 14A is also connected to the first outlet 13B1 of the primary desulfurization tower, so that the separated gas discharged through the first outlet 27B1 of the activated carbon tower undergoes two successive desulfurizations, so that the desulfurization of the separated gas is sufficiently complete.

The return gas pretreatment and desulfurization skid block A also includes a shut-off valve 28, which is arranged on the upstream pipeline of the first gas-liquid separator inlet 11A, and is used to control the opening and closing of the upstream pipeline of the first gas-liquid separator inlet 11A . When other emergencies such as excessive return exhaust flow from the top outlet of the three-phase separator occur, the shut-off valve 28 can close the upstream pipeline of the first gas-liquid separator inlet 11A in time to protect the safety of the system.

The return gas pretreatment and desulfurization skid block A also includes a flow meter 15, which is arranged on the pipeline between the first particulate filter 12 and the activated carbon tower 27, and is used to monitor the separation flowing out through the first outlet 12B1 of the first particulate filter. air flow. The flow meter 15 is used to measure the flow rate of the separated gas entering the primary desulfurization tower 13 and the secondary desulfurization tower 14, so as to prevent the flow rate from being too large and causing incomplete desulfurization of the separated gas.

The first gas-liquid separator 11, the first particle filter 12, the activated carbon tower 27, the first-stage desulfurization tower 13, the second-stage desulfurization tower 14, the flow meter 15, and the cut-off valve 28 are skid-mounted to make a return gas pretreatment and desulfurization skid Block A, this skid-mounted design only needs to disconnect each part (the first gas-liquid separator 11, the first particle filter 12, the activated carbon 27, the primary desulfurization tower 13, the secondary desulfurization tower 14, the flow meter 15, the cut-off Valves 28, pipelines, etc.) are assembled in the factory to form an integrated device, and then transported to the production site for use, which simplifies the structural complexity of the equipment required for the separation of carbon dioxide and natural gas from the return gas, and reduces the installation cost. In addition, the return gas pretreatment and desulfurization skid block A is convenient for maintenance and management.

The cold-drying skid B includes a cold-drying machine 16 , a second gas-liquid separator 17 and a second particle filter 18 .

The refrigerating machine 16 includes: an inlet 16A of the refrigerating machine, which is connected to the first outlet 13B1 of the primary desulfurization tower and the first outlet 14B1 of the secondary desulfurizing tower; the first outlet 16B1 of the refrigerating machine; External sewage pool.

The second gas-liquid separator 17 includes: the inlet 17A of the second gas-liquid separator, which is connected to the first outlet 16B1 of the refrigerating machine; the first outlet 17B1 of the second gas-liquid separator; and the second outlet 17B2 of the second gas-liquid separator, which is connected with It is connected to the external sewage pool.

The second particle filter 18 includes: the second particle filter inlet 18A, which is connected to the first outlet 17B1 of the second gas-liquid separator; the first outlet 18B1 of the second particle filter, which is connected to the compressor inlet block C; the second particle filter The second outlet 18B2 of the filter is used to communicate with the external sewage pool.

Wherein, the desulfurized separated gas discharged through the primary desulfurization tower 13 and the secondary desulfurization tower 14 enters the refrigerated dryer 16 through the inlet 16A of the refrigerated dryer for refrigerating and dehydration treatment, and the dehydrated separated gas (the dehydrated separated gas still carry some small droplets) into the second gas-liquid separator 17 through the first outlet 16B1 of the freeze dryer and the second gas-liquid separator inlet 17A for gas-liquid separation, and the separated gas passes through the second gas-liquid separator The first outlet 17B1 and the second particle filter inlet 18A enter the second particle filter 18 to further remove solid impurity particles in the gas, and the removed solid impurity particles are discharged into the sewage tank, and pass through the second particle filter. The gas filtered by the filter 18 flows into the compressor feed block C through the first outlet 18B1 of the second particle filter for further operation.

It should be noted that the water content in the return gas will seriously increase the load of the membranes in the primary membrane tube 23 and the secondary membrane tube 24 described below, which will seriously affect the selectivity and permeability of the membrane. 16 is used to further dehydrate the desulfurized separated gas. Under the action of the cooling dryer 16, the water vapor carried in the separated gas will be condensed and converted into small droplets, and the small droplets will enter the external sewage tank and cool down. The setting of the dryer 16 further removes the water contained in the separation gas, improves the separation efficiency of the membrane tube described below, and at the same time reduces the dew point of the separation gas, which can ensure that the separation gas does not generate when entering the membrane separation skid D. condensate liquid; in addition, the setting of the second particle filter 18 can play a role in removing solid particle impurities from the gas entering the membrane separation skid D, preventing the gas entering the membrane tube from carrying solid particles and affecting the separation performance of the membrane tube .

The cold-drying skid block B also includes a first gas analyzer 19, which is arranged between the second outlet 14B2 of the secondary desulfurization tower and the refrigerating machine 16, and is used to detect the gas from the first outlet 14B1 of the secondary desulfurization tower and the second outlet of the primary desulfurization tower 14B2. The content of sulfide in the gas discharged from an outlet 13B1. The first gas analyzer 19 can effectively monitor the content of hydrogen sulfide contained in the separated gas discharged through the first outlet 13B1 of the primary desulfurization tower and the first outlet 14B1 of the secondary desulfurization tower, thereby ensuring that sulfides such as hydrogen sulfide are reduced to all levels. need to ask.

The refrigerated dryer 16, the second gas-liquid separator 17, the second particle filter 18, and the first gas analyzer 19 are skid-mounted to form the refrigerated drying skid block B. This skid-mounted design only needs to 16, the second gas-liquid separator 17, the second particle filter 18, the first gas analyzer 19, pipelines, etc.) are assembled in the factory to form an integrated device, and then transported to the production site for use, simplifying The structure complexity of the equipment required to separate carbon dioxide and natural gas from the return gas is reduced, and the installation cost is reduced. In addition, the cold-drying skid B is convenient for maintenance and management, which reduces the cost of later maintenance and management.

The compressor feed block C includes a first compressor 20 .

The first compressor 20 includes: a first compressor inlet 20A, which is connected to the first outlet 18B1 of the second particle filter; a first compressor first outlet 20B1; .

Wherein, the gas discharged through the first outlet 18B1 of the second particulate filter enters the first compressor 20 through the first compressor inlet 20A, the gas is compressed and pressurized by the first compressor 20, and then passes through the first compressor 20A. Outlet 20B1 enters into membrane separation skid D for further operations.

It should be noted that the gas before entering the membrane (the first-stage membrane tube 23 and the second-stage membrane tube 24 described below) needs to have a certain pressure, and the setting of the first compressor 20 can prevent the gas passing through the second particle filter The gas discharged from the first outlet 18B1 is pressurized to ensure that the gas has the required pressure before entering the membrane, so that the membrane separation skid D can separate natural gas that meets the standard. Similarly, the design of the compressor membrane feed block C simplifies the structural complexity of the equipment required for the separation of carbon dioxide and natural gas from the return gas, reduces the installation cost, and at the same time reduces the cost of subsequent maintenance and management.

The membrane separation block D includes a filter assembly 21 , an electric heater 22 , a primary membrane tube 23 and a secondary membrane tube 24 .

The filter assembly 21 includes a third particulate filter 211 and a fourth particulate filter 212, which are sequentially disposed downstream of the first outlet 20B1 of the first compressor.

The third particulate filter 211 includes: a third particulate filter inlet 211A, which communicates with the first compressor first outlet 20B1; a third particulate filter first outlet 211B1; and a third particulate filter second outlet 211B2, which communicates with the outside Sewage pool.

The fourth particle filter 212 includes: a fourth particle filter inlet 212A, which communicates with the third particle filter first outlet 211B1; the fourth particle filter first outlet 212B1; and the fourth particle filter second outlet 212B2, which communicates with External sewage pool. As mentioned above, if the gas carries solid particle impurities, it will adversely affect the performance of the membrane separation skid D, which will seriously affect the membrane separation effect. The double filtration effect can effectively remove the solid particle impurities mixed in the gas, prevent the gas before entering the membrane from carrying solid impurity particles, and ensure the separation effect and efficiency of the primary membrane tube 23 and the secondary membrane tube 24 described below. .

The electric heater 22 includes: an electric heater inlet 22A, which communicates with the first outlet 212B1 of the fourth particulate filter; and an electric heater outlet 22B. Similarly, if the gas before entering the membrane contains liquid such as water vapor, it will also affect the separation performance of the membrane in the membrane tube, and the setting of the heater 22 will heat the gas before entering the membrane to remove the liquid carried in the gas. The droplet is converted into a gaseous state, and at the same time, the temperature of the gas is kept high enough to prevent the condensation of liquid after the gas enters the membrane tube, which ensures the separation effect of the membrane tube.

The primary membrane tube 23 includes: the primary membrane tube inlet 23A, which communicates with the electric heater outlet 22B; the primary membrane tube low pressure outlet 23B1, which communicates with the first compressor inlet 20A; the primary membrane tube high pressure outlet 23B2.

The secondary membrane tube 24 includes: the inlet 24A of the secondary membrane tube, which is connected to the high-pressure outlet 23B2 of the primary membrane tube; the low-pressure outlet of the secondary membrane tube 24B1 is connected to the carbon dioxide pressurized reinjection skid block E; the high-pressure outlet of the secondary membrane tube 24B2 is connected to for connection to external natural gas pipelines.

The pressurized gas discharged through the first outlet 20B1 of the first compressor enters the third particulate filter 211 and the fourth particulate filter 212 for filtration in sequence, and the filtered gas enters the electric heater through the electric heater inlet 23A. Vaporization treatment is carried out in the device 22, and then it is discharged through the electric heater outlet 22B. The discharged gas is first subjected to the primary membrane tube 23 for primary separation treatment, and then enters the secondary membrane tube 24 for secondary separation and the carbon dioxide in the mixed gas. Separated from the hydrocarbon gas, the separated carbon dioxide enters the carbon dioxide pressurization reinjection block E through the low-pressure outlet 24B1 of the secondary membrane tube; the separated hydrocarbon gas directly enters the external natural gas pipeline.

The first-stage membrane tube 23 separates and filters the mixed gas for the first time, and the carbon dioxide discharged from the low-pressure outlet 23B1 of the first-stage membrane tube is mixed with a part of hydrocarbon gases such as methane. Therefore, the low-pressure outlet 23B1 of the first-stage membrane tube is connected to the first compressor inlet 20A, thereby The carbon dioxide containing hydrocarbon gas is recompressed and pressurized to enter the membrane separation block D again for filtration, which reduces the waste of natural gas and improves the extraction of natural gas; the natural gas discharged from the high-pressure outlet 23B2 of the first-stage membrane tube is mixed with A part of carbon dioxide, the purity of natural gas fails to meet the natural gas use standard, therefore, further separation and filtration are required, so the natural gas containing carbon dioxide flows into the secondary membrane tube 24 through the high pressure outlet 23B2 of the primary membrane tube for further separation, and passes through the secondary membrane tube. 24, the natural gas containing carbon dioxide is separated into carbon dioxide and standard natural gas. The carbon dioxide flows into the carbon dioxide reinjection block E through the low-pressure outlet 24B1 of the secondary membrane tube for re-injection. The natural gas flows into the external natural gas pipeline. The double filtration effect of the primary membrane tube 23 and the secondary membrane tube 24 fully filters and extracts the natural gas, preventing the waste of natural gas, and at the same time effectively recovering carbon dioxide and reducing environmental pollution. .

The membrane separation block D also includes a second gas analyzer 25, wherein the primary membrane tube low pressure outlet 23B1, the primary membrane tube high pressure outlet 23B2, the secondary membrane tube low pressure outlet 24B1, and the secondary membrane tube high pressure outlet 24B2 are respectively connected to The second gas analyzer 25 .

Similarly, the filter assembly 21, the electric heater 22, the primary membrane tube 23, the secondary membrane tube 24, and the second gas analyzer 25 are skid-mounted to form the membrane separation skid D. This skid-mounted design only requires the Each part (filter assembly 21, electric heater 22, primary membrane tube 23, secondary membrane tube 24, second gas analyzer 25, piping, etc.) is assembled in the factory to form an integrated device, and then transported to production It can be used by connecting with other skid blocks on site, which simplifies the structural complexity of the equipment required for the separation of carbon dioxide and natural gas by the return gas, and reduces the installation cost. The block can be maintained and managed independently, which reduces the cost of system maintenance and management.

In one embodiment, the number of compressor membrane feeding skid blocks C is set to two; correspondingly, the number of membrane separation skid blocks D is set to two, and each membrane separation skid block D is communicated with two compressor membrane feeding skid blocks C respectively, And each membrane separation skid block D is in communication with the carbon dioxide pressurized reinjection skid block E. This design allows the gas discharged through the first outlet 18B1 of the second particulate filter to enter the two compressors and enter the membrane block C, and then enter the two membrane separation blocks D for the separation of carbon dioxide and natural gas, which improves the return rate. Separation efficiency of carbon dioxide and natural gas from exhaust gas.

The carbon dioxide booster reinjection block E includes a second compressor 26, the second compressor 26 includes: a second compressor inlet 26A; a second compressor first outlet 26B1 for discharging carbon dioxide; the second compressor second The outlet 26B2 is used to communicate with the external sewage tank; wherein, the gas separated from the secondary membrane tube low-pressure outlet 24B1 of the secondary membrane tube 24 of each membrane separation block D enters the second compressor from the second compressor inlet 26A 26 is compressed, and the compressed carbon dioxide is discharged through the first outlet 26B1 of the second compressor, and then injected back into the ground. This process effectively recovers the carbon dioxide, so that the carbon dioxide can be used again, reducing the extra consumption of the produced fluid in the oilfield by carbon dioxide flooding. The amount of carbon dioxide reduces costs, while preventing carbon dioxide from being emitted into the atmosphere and polluting the environment.

Claims (10)

1. a skid-mounted carbon dioxide drive back exhaust gas desulfurization dehydration and carbon dioxide recovery system, is characterized in that, Including back exhaust gas pretreatment and desulfurization skid block (A), cold drying skid block (B), compressor membrane feeding skid block (C), membrane separation skid block (D), carbon dioxide booster reinjection skid block (E) ; The cold-drying skid block (B) is connected with the return exhaust gas pretreatment and desulfurization skid block (A) through a pipeline; The compressor film feeding block (C) is communicated with the cold drying block (B) through a pipeline; The membrane separation block (D) is communicated with the compressor membrane feed block (C) through a pipeline; The carbon dioxide pressurized reinjection block (E) is communicated with the membrane separation block (D) through a pipeline; Among them, the return exhaust gas first enters the return exhaust gas pretreatment and desulfurization block (A) for pretreatment and desulfurization, and the return exhaust gas after pretreatment and desulfurization enters the cold drying block (B) to be used in the cold drying block (B). The dehydration treatment is carried out in (B), the return gas after the dehydration treatment enters the compressor membrane feed block (C) to be pressurized, and the pressurized return gas enters the membrane separation block (D) for gas Separation to separate carbon dioxide and hydrocarbon gas, the separated carbon dioxide enters the carbon dioxide pressurized reinjection sled (E) for pressurized reinjection treatment, and the hydrocarbon gas is used as natural gas. 2. the skid-mounted carbon dioxide drive back exhaust gas desulfurization dehydration and carbon dioxide recovery system according to claim 1, is characterized in that, The return gas pretreatment and desulfurization skid block (A) includes a first gas-liquid separator (11), a first particle filter (12), an activated carbon tower (27), and at least one-stage desulfurization tower; The first gas-liquid separator (11) includes: the first gas-liquid separator inlet (11A); the first outlet (11B1) of the first gas-liquid separator; The second outlet (11B2) of the first gas-liquid separator is used to communicate with the external sewage tank; The first particulate filter (12) includes: The first particle filter inlet (12A) is connected to the first outlet (11B1) of the first gas-liquid separator; the first outlet of the first particle filter (12B1); The second outlet (12B2) of the first particle filter is used to communicate with the external sewage tank; The activated carbon tower (27) includes: The activated carbon tower inlet (27A) is connected to the first outlet (12B1) of the first particle filter; The first outlet of activated carbon tower (27B1); The second outlet (27B2) of the active tower is used to communicate with the external sewage pool; The primary desulfurization tower (13) includes: The inlet (13A) of the primary desulfurization tower is connected to the first outlet (27B1) of the activated carbon tower; The first outlet (13B1) of the first-stage desulfurization tower is connected to the cold-drying skid block (B); The second outlet (13B2) of the primary desulfurization tower is used to communicate with the external sewage pool; Wherein, the return gas enters the first gas-liquid separator (11) through the first gas-liquid separator inlet (11A) for gas-liquid separation and forms separated gas and liquid, and the liquid passes through the second outlet of the first gas-liquid separator (11A). 11B2) flows into the sewage tank; the separated gas enters the first particle filter (12) through the first outlet (11B1) of the first gas-liquid separator and the first particle filter inlet (12A) for filtration, so that the separated gas is filtered. The mixed solid impurity particles are first filtered, the filtered solid impurity particles are discharged into the sewage tank through the second outlet (12B2) of the first particle filter, and the filtered separated gas is passed through the first outlet of the first particle filter (12B2). 12B1), the activated carbon tower inlet (27A) enters the activated carbon tower (27) to remove heavy hydrocarbons, and the removed heavy hydrocarbons are discharged into the sewage tank through the second outlet of the activated carbon tower (27B2), and the separated gas for removing heavy hydrocarbons is at least Part of it enters the first-stage desulfurization tower (13) through the first outlet (27B1) of the activated carbon tower and the first-stage desulfurization tower inlet (13A) for desulfurization, and the removed sulfur-containing sewage flows into the first-stage desulfurization tower through the second outlet (13B2). In the sewage tank, the separated gas after desulfurization flows into the cold drying skid (B) through the first outlet (13B1) of the desulfurization tower for the next operation. 3. The skid-mounted carbon dioxide drive-back exhaust gas desulfurization dehydration and carbon dioxide recovery system according to claim 2, is characterized in that, The return gas pretreatment and desulfurization skid block (A) also includes a secondary desulfurization tower (14), The secondary desulfurization tower (14) includes: The inlet (14A) of the secondary desulfurization tower is connected to the first outlet (27B1) of the activated carbon tower and the first outlet (13B1) of the primary desulfurization tower; The first outlet (14B1) of the secondary desulfurization tower is connected to the cold drying skid (B); The second outlet (14B2) of the secondary desulfurization tower is used to communicate with the external sewage pool; Wherein, at least part of the separated gas discharged through the first outlet of the activated carbon tower (27B1) enters the secondary desulfurization tower (14) through the inlet of the secondary desulfurization tower (14A) for desulfurization treatment, and passes through the first outlet of the first desulfurization tower (13B1). ) discharged separated gas is re-entered into the secondary desulfurization tower (14) through the secondary desulfurization tower inlet (14A) for secondary desulfurization, and the desulfurized separated gas flows into the cold drying through the first outlet (14B1) of the secondary desulfurization tower In the skid block (B), the sulfur-containing sewage removed by the secondary desulfurization tower (14) flows into the sewage pool through the second outlet (14B2) of the secondary desulfurization tower. 4. the skid-mounted carbon dioxide drive back exhaust gas desulfurization dehydration and carbon dioxide recovery system according to claim 2, is characterized in that, The return gas pretreatment and desulfurization skid block (A) further comprises: a shut-off valve (28), which is arranged on the upstream pipeline of the first gas-liquid separator inlet (11A) and is used to control the first gas-liquid separator inlet (11A). ) opening and closing of the upstream pipeline. 5. The skid-mounted carbon dioxide drive-back exhaust gas desulfurization dehydration and carbon dioxide recovery system according to claim 3 is characterized in that, The cold-drying skid block (B) includes a cold-drying machine (16), a second gas-liquid separator (17) and a second particle filter (18), The freeze dryer (16) includes: The inlet (16A) of the refrigeration dryer is connected to the first outlet (13B1) of the primary desulfurization tower and the first outlet (14B1) of the secondary desulfurization tower; The first outlet of the refrigerating machine (16B1); The second outlet (16B2) of the refrigerating machine is used to communicate with the external sewage pool; The second gas-liquid separator (17) includes: The inlet (17A) of the second gas-liquid separator is connected to the first outlet (16B1) of the refrigerating machine; The first outlet of the second gas-liquid separator (17B1); The second outlet (17B2) of the second gas-liquid separator is used to communicate with the external sewage tank; The second particulate filter (18) includes: The second particle filter inlet (18A) communicates with the first outlet (17B1) of the second gas-liquid separator; The first outlet (18B1) of the second particle filter is communicated with the compressor inlet block (C); The second outlet (18B2) of the second particle filter is used to communicate with the external sewage pool; Wherein, the desulfurized separated gas discharged from the primary desulfurization tower (13) and the secondary desulfurization tower (14) enters the refrigerated dryer (16) through the refrigerated dryer inlet (16A) for refrigerated dehydration treatment, and the dehydrated The separated gas enters the second gas-liquid separator (17) through the first outlet (16B1) of the cold dryer and the second gas-liquid separator inlet (17A) for gas-liquid separation, and the separated gas passes through the second gas-liquid separator The first outlet (17B1) and the second particle filter inlet (18A) enter the second particle filter (18) to further remove solid impurity particles in the gas, and the removed solid impurity particles are discharged into the sewage tank , the gas filtered by the second particle filter (18) flows into the compressor feed block (C) through the first outlet (18B1) of the second particle filter for further operation. 6. The skid-mounted carbon dioxide drive-back exhaust gas desulfurization dehydration and carbon dioxide recovery system according to claim 5 is characterized in that, The compressor film feed block (C) includes a first compressor (20), The first compressor (20) includes: The first compressor inlet (20A) is connected to the first outlet (18B1) of the second particulate filter; a first compressor first outlet (20B1); The second outlet (20B2) of the first compressor is used to communicate with the external sewage pool; Wherein, the gas discharged through the first outlet (18B1) of the second particulate filter enters the first compressor (20) through the first compressor inlet (20A), and the gas is compressed and pressurized by the first compressor (20), It then enters the membrane separation skid (D) via the first compressor first outlet (20B1) for further operation. 7. The skid-mounted carbon dioxide drive-back exhaust gas desulfurization dehydration and carbon dioxide recovery system according to claim 6, characterized in that, The membrane separation block (D) comprises a filter assembly (21), an electric heater (22), a primary membrane tube (23), and a secondary membrane tube (24); The filter assembly (21) includes a third particle filter (211) and a fourth particle filter (212), and the third particle filter (211) and the fourth particle filter (212) are sequentially arranged on the first compressor. Downstream of an outlet (20B1), The third particulate filter (211) includes: The third particle filter inlet (211A) communicates with the first compressor first outlet (20B1); The first outlet of the third particle filter (211B1); The second outlet (211B2) of the third particle filter is used to communicate with the external sewage pool; The fourth particulate filter (212) includes: The fourth particle filter inlet (212A) is connected to the third particle filter first outlet (211B1); The fourth particle filter first outlet (212B1); The second outlet (212B2) of the fourth particle filter is used to communicate with the external sewage pool; The electric heater (22) includes: The electric heater inlet (22A) communicates with the first outlet (212B1) of the fourth particulate filter; Electric heater outlet (22B); The primary membrane tube (23) includes: The first-stage membrane tube inlet (23A) is connected to the electric heater outlet (22B); The first-stage membrane tube low-pressure outlet (23B1) is connected to the first compressor inlet (20A); The high pressure outlet of the first-stage membrane tube (23B2); The secondary membrane tube (24) includes: The inlet (24A) of the secondary membrane tube is connected to the high pressure outlet (23B2) of the primary membrane tube; The low-pressure outlet (24B1) of the secondary membrane tube is connected to the carbon dioxide pressurized reinjection block (E); Secondary membrane tube high pressure outlet (24B2), used to connect external natural gas pipelines; The pressurized gas discharged through the first outlet (20B1) of the first compressor enters the third particle filter (211) and the fourth particle filter (212) for filtration in turn, and the filtered gas passes through the electric heater. The inlet (23A) enters the electric heater (22) for gasification treatment, and then is discharged through the electric heater outlet (22B). The secondary membrane tube (24) performs secondary separation and separates the carbon dioxide in the gas from the hydrocarbon gas, and the separated carbon dioxide enters the carbon dioxide pressurization reinjection block (E) through the secondary membrane tube low-pressure outlet (24B1); The separated hydrocarbon gas goes directly to the external natural gas pipeline. 8. The skid-mounted carbon dioxide drive-back exhaust gas desulfurization dehydration and carbon dioxide recovery system according to claim 7, characterized in that, The membrane separation skid (D) further comprises a second gas analyzer (25), Among them, the low-pressure outlet of the primary membrane tube (23B1), the high-pressure outlet of the primary membrane tube (23B2), the low-pressure outlet of the secondary membrane tube (24B1), and the high-pressure outlet of the secondary membrane tube (24B2) are respectively connected to the second gas analyzer ( 25). 9. The skid-mounted carbon dioxide drive-back exhaust gas desulfurization dehydration and carbon dioxide recovery system according to claim 8, characterized in that, The number of compressor membrane feed sleds (C) is set to two; correspondingly, the number of membrane separation sleds (D) is set to two, and each membrane separation sled (D) and the two compressor membrane feed sleds (C) are respectively communication, and each membrane separation block (D) communicates with the carbon dioxide pressurization reinjection block (E). 10. The skid-mounted carbon dioxide drive-back exhaust gas desulfurization dehydration and carbon dioxide recovery system according to claim 9, characterized in that: The carbon dioxide booster reinjection skid (E) includes a second compressor (26), the second compressor (26) including: second compressor inlet (26A); The second compressor first outlet (26B1) is used to discharge carbon dioxide; The second outlet (26B2) of the second compressor is used to communicate with the external sewage pool; Wherein, the gas separated from the secondary membrane tube low pressure outlet (24B1) of the secondary membrane tube (24) of each membrane separation block (D) enters the second compressor (26A) from the second compressor inlet (26A) ) is compressed, and the compressed carbon dioxide is discharged through the first outlet (26B1) of the second compressor for further processing.