A skid-mounted modular marine membrane-based carbon capture system

Abstract

The utility model discloses a pry dress formula modularization marine membrane method carbon capture system, the pry dress formula modularization marine membrane method carbon capture system includes: marine exhaust gas pretreatment pry, carbon dioxide capture pry and carbon dioxide liquefied storage pry, marine exhaust gas pretreatment pry is connected with carbon dioxide capture pry, and carbon dioxide capture pry is connected with carbon dioxide liquefied storage pry. The utility model discloses the marine exhaust gas pretreatment pry, carbon dioxide capture pry and carbon dioxide liquefied storage pry that are set up, to the absorption of marine exhaust gas first pretreatment to remove dust and desulfurization denitration, then to the pretreated marine exhaust gas carries out carbon dioxide's capture and compression, obtains high concentration carbon dioxide, finally carries out multistage cooling compression to high concentration carbon dioxide of carbon dioxide capture pry input, obtains liquefied carbon dioxide and stores, and the integrated comprehensive treatment of marine exhaust gas is realized based on membrane method carbon capture.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas treatment technology, and in particular to a skid-mounted modular marine membrane carbon capture system. Background Technology

[0002] Marine exhaust carbon capture technology, as an important means of emission reduction, is dedicated to capturing and storing CO2 emitted by ships, thereby significantly reducing its emissions into the atmosphere. It is gradually becoming a key measure to promote the shipping industry's transformation towards sustainable development.

[0003] Ship exhaust emissions are not only high-volume but also complex in composition, making it difficult to directly transplant mature land-based carbon capture technologies. Currently, mainstream marine technologies still rely on liquid absorption methods, but their inherent drawbacks, such as large equipment size and high energy consumption, create a sharp conflict with the limited space and load capacity of ships. Furthermore, the vastly different engine power and spatial layouts of various types of ships make it difficult to standardize carbon capture systems tailored to specific ship types, thus severely restricting the large-scale adoption of this technology.

[0004] As a technology that relies on semi-permeable membranes to separate components, membrane separation has mature and widespread applications in industry. Introducing it into the field of ship carbon capture can achieve higher capture efficiency and lower operating energy consumption, and is expected to solve the pain points of traditional methods, such as large footprint, heavy weight, and high energy consumption.

[0005] Therefore, there is an urgent need for a skid-mounted modular marine membrane carbon capture system. Utility Model Content

[0006] In view of the above problems, this utility model is proposed to provide a skid-mounted modular marine membrane carbon capture system that overcomes or at least partially solves the above problems.

[0007] This invention provides a skid-mounted modular marine membrane carbon capture system, comprising: a ship exhaust gas pretreatment skid, a carbon dioxide capture skid, and a carbon dioxide liquefaction and storage skid. The ship exhaust gas pretreatment skid is connected to the carbon dioxide capture skid, and the carbon dioxide capture skid is connected to the carbon dioxide liquefaction and storage skid. The ship exhaust gas pretreatment skid is installed at the ship's exhaust gas outlet and is used to pretreat the ship exhaust gas entering through the exhaust gas outlet for dust removal, desulfurization, and denitrification. The carbon dioxide capture skid is used to capture and compress carbon dioxide from the pretreated ship exhaust gas to obtain high-concentration carbon dioxide. The carbon dioxide liquefaction and storage skid is used to perform multi-stage cooling and compression on the high-concentration carbon dioxide input from the carbon dioxide capture skid to obtain liquefied carbon dioxide for storage.

[0008] Optionally, the ship exhaust gas pretreatment skid includes a high-temperature resistant gas transfer pump, a cold water spray tower, an adsorption desulfurization tank, an adsorption denitrification tank, and a dehumidifier / mist eliminator; wherein, the inlet end of the high-temperature resistant gas transfer pump is located at the ship's exhaust gas outlet to absorb the ship's exhaust gas entering through the exhaust gas outlet, and the outlet end of the high-temperature resistant gas transfer pump is connected to the inlet end of the cold water spray tower; the upper end of the cold water spray tower is provided with an outlet end, which is connected to the inlet end of the adsorption desulfurization tank; the outlet end of the adsorption desulfurization tank is connected to the inlet end of the adsorption denitrification tank; the outlet end of the adsorption denitrification tank is connected to the inlet end of the dehumidifier / mist eliminator, and the outlet end of the dehumidifier / mist eliminator is connected to the carbon dioxide capture skid.

[0009] Optionally, the ship exhaust gas pretreatment skid also includes a cooling water tank and a circulating water pump. A circulation port is provided in the middle of the tower body of the cold water spray tower. The circulation port is connected to the cooling water tank through a circulation pipeline, and a circulating water pump is provided on the circulation pipeline.

[0010] Optionally, the carbon dioxide capture skid includes a first-stage gas buffer tank, a first-stage gas booster pump, a humidifier tank, a first-stage membrane separator, a second-stage gas buffer tank, a second-stage gas booster pump, and a second-stage membrane separator. The inlet of the first-stage gas buffer tank is connected to the outlet of the dehumidifier / mist eliminator, and the outlet of the first-stage gas buffer tank is connected to the inlet of the first-stage gas booster pump. The outlet of the first-stage gas booster pump is connected to the inlet of the humidifier tank, and the outlet of the humidifier tank is connected to the retention side of the first-stage membrane separator. The retention side of the first-stage membrane separator is connected to the inlet of the second-stage gas buffer tank, and the outlet of the second-stage gas buffer tank is connected to the inlet of the second-stage gas booster pump. The outlet of the second-stage gas booster pump is connected to the retention side of the second-stage membrane separator.

[0011] Optionally, the carbon dioxide capture skid further includes a secondary gas buffer tank, a secondary gas booster pump, and a secondary membrane separator. The permeate side of the first-stage membrane separator and the permeate side of the first-stage membrane separator are both connected to the inlet end of the secondary gas buffer tank. The outlet end of the secondary gas buffer tank is connected to the inlet end of the secondary gas booster pump, and the outlet end of the secondary gas booster pump is connected to the filtration side of the secondary membrane separator. The permeate side of the secondary membrane separator is connected to the carbon dioxide liquefaction storage skid.

[0012] Optionally, a gas flow controller is provided at the outlet of each of the first-stage gas buffer tank, the first-stage second-stage gas buffer tank, and the second-stage gas buffer tank.

[0013] Optionally, the carbon dioxide liquefaction storage skid includes a carbon dioxide buffer tank, a multi-stage cooling compressor, and a liquid carbon dioxide storage tank. The inlet of the carbon dioxide buffer tank is connected to the permeate side of the secondary membrane separator, the outlet of the carbon dioxide buffer tank is connected to the inlet of the multi-stage cooling compressor, and the outlet of the multi-stage cooling compressor is connected to the liquid carbon dioxide storage tank.

[0014] Optionally, the ship exhaust gas pretreatment skid, carbon dioxide capture skid, and carbon dioxide liquefaction storage skid are all equipped with detection instrument assemblies, which include at least a pressure gauge and a carbon dioxide concentration detector.

[0015] Optionally, the ship exhaust gas pretreatment skid, carbon dioxide capture skid, and carbon dioxide liquefaction storage skid are all modular structures, and the ship exhaust gas pretreatment skid, carbon dioxide capture skid, and carbon dioxide liquefaction storage skid are integrated into a standard container.

[0016] Optionally, the ship exhaust gas pretreatment skid, carbon dioxide capture skid, and carbon dioxide liquefaction storage skid are respectively installed in different standard containers and interconnected by pipelines in a combination of parallel series or vertical arrangement.

[0017] The technical solution provided in this embodiment of the utility model has at least the following technical effects or advantages: The skid-mounted modular marine membrane carbon capture system described in this embodiment uses a pre-treatment skid for ship exhaust gas, a carbon dioxide capture skid, and a carbon dioxide liquefaction and storage skid to pre-treat the absorbed ship exhaust gas for dust removal, desulfurization, and denitrification. Then, the pre-treated ship exhaust gas is subjected to carbon dioxide capture and compression to obtain high-concentration carbon dioxide. Finally, the high-concentration carbon dioxide input from the carbon dioxide capture skid is subjected to multi-stage cooling and compression to obtain liquefied carbon dioxide, which is then stored. Based on membrane carbon capture, integrated treatment of ship exhaust gas is achieved.

[0018] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the principle structure of the skid-mounted modular marine membrane carbon capture system described in this utility model.

[0021] Explanation of reference numerals in the attached figures: 1. Ship exhaust gas pretreatment skid; 10. High-temperature resistant gas transfer pump; 11. Cold water spray tower; 12. Adsorption desulfurization tank; 13. Adsorption denitrification tank; 14. Dehumidifier and mist eliminator; 15. Cooling water tank; 16. Circulating water pump; 2. Carbon dioxide capture skid; 20. First-stage gas buffer tank; 21. First-stage gas booster pump; 22. Humidifier tank; 23. First-stage membrane separator; 24. First-stage second-stage gas buffer tank; 25. First-stage second-stage gas booster pump; 26. First-stage second-stage membrane separator; 27. Second-stage gas buffer tank; 28. Second-stage gas booster pump; 29. ​​Second-stage membrane separator; 3. Carbon dioxide liquefaction storage skid; 30. Carbon dioxide buffer tank; 31. Multistage cooling compressor; 32. Liquid carbon dioxide storage tank. Detailed Implementation

[0022] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings.

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The accompanying drawings show preferred embodiments of the present invention. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present invention more thorough and complete.

[0024] Unless otherwise specified, all raw materials, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0025] Figure 1 This is a schematic diagram illustrating the principle and structure of a skid-mounted modular marine membrane carbon capture system according to an embodiment of this utility model. (See attached diagram.) Figure 1As shown, the skid-mounted modular marine membrane carbon capture system includes a ship exhaust gas pretreatment skid 1, a carbon dioxide capture skid 2, and a carbon dioxide liquefaction and storage skid 3. The ship exhaust gas pretreatment skid 1 is connected to the carbon dioxide capture skid 2, and the carbon dioxide capture skid 2 is connected to the carbon dioxide liquefaction and storage skid 3. The ship exhaust gas pretreatment skid 1 is located at the ship's exhaust gas outlet and is used to pretreat the ship exhaust gas entering through the exhaust gas outlet for dust removal, desulfurization, and denitrification. The carbon dioxide capture skid 2 is used to capture and compress carbon dioxide from the pretreated ship exhaust gas to obtain high-concentration carbon dioxide. The carbon dioxide liquefaction and storage skid 3 is used to perform multi-stage cooling and compression on the high-concentration carbon dioxide input from the carbon dioxide capture skid 2 to obtain liquefied carbon dioxide for storage.

[0026] In this embodiment of the invention, the ship exhaust gas pretreatment skid 1 includes a high-temperature resistant gas transfer pump 10, a cold water spray tower 11, an adsorption desulfurization tank 12, an adsorption denitrification tank 13, a dehumidifier / mist eliminator 14, a cooling water tank 15, and a circulating water pump 16; wherein, the air inlet of the high-temperature resistant gas transfer pump 10 is located at the ship's exhaust gas outlet, for absorbing the ship's exhaust gas entering through the exhaust gas outlet, and the air outlet of the high-temperature resistant gas transfer pump 10 is connected to the air inlet of the cold water spray tower 11; the upper part of the cold water spray tower 11 is provided with... The cold water spray tower 11 has an outlet, which is connected to the inlet of the adsorption desulfurization tank 12; the outlet of the adsorption desulfurization tank 12 is connected to the inlet of the adsorption denitrification tank 13; the outlet of the adsorption denitrification tank 13 is connected to the inlet of the dehumidifier 14, and the outlet of the dehumidifier 14 is connected to the carbon dioxide collection skid 2; a circulation port is provided in the middle of the tower body of the cold water spray tower 11, and the circulation port is connected to the cooling water tank 15 through a circulation pipeline, and a circulation water pump 16 is provided on the circulation pipeline.

[0027] The high-temperature resistant gas transfer pump 10 can be installed at or near the ship's exhaust outlet. The high-temperature resistant gas transfer pump 10 absorbs the ship's exhaust gas (composed of CO2, N2, O2, SO2, etc.) discharged from the exhaust outlet by generating negative pressure. x NO x The exhaust gas, composed of smoke, dust, etc., is first introduced into the cold water spray tower 11 for cooling and dust removal. The cold water spray tower 11 is connected to the cooling water tank 15 and can continuously provide cooling water for recycling under the action of the circulating water pump 16. The exhaust gas after cooling and dust removal is then introduced into the adsorption desulfurization tank 12, the adsorption denitrification tank 13 and the dehumidification mist eliminator 14 through the gas outlet at the upper end of the tower body of the cold water spray tower 11 for desulfurization, denitrification and demisting, respectively, to remove SOx and NOx and dehydrate. The dehydrated dry gas is then introduced into the carbon dioxide capture skid 2.

[0028] The carbon dioxide capture skid 2 includes a primary gas buffer tank 20, a primary gas booster pump 21, a humidifier tank 22, a primary membrane separator 23, a primary second-stage gas buffer tank 24, a primary second-stage gas booster pump 25, a primary second-stage membrane separator 26, a secondary gas buffer tank 27, a secondary gas booster pump 28, and a secondary membrane separator 29. The inlet of the primary gas buffer tank 20 is connected to the outlet of the dehumidifier / mist eliminator 14, and the outlet of the primary gas buffer tank 20 is connected to the primary gas booster pump. The air inlet of 21 is connected; the air outlet of the first-stage gas booster pump 21 is connected to the air inlet of the humidifier tank 22, and the air outlet of the humidifier tank 22 is connected to the retention side of the first-stage membrane separator 23; the retention side of the first-stage membrane separator 23 is connected to the air inlet of the first-stage second-stage gas buffer tank 24, the air outlet of the first-stage second-stage gas buffer tank 24 is connected to the air inlet of the first-stage second-stage gas booster pump 25, and the air outlet of the first-stage second-stage gas booster pump 25 is connected to the retention side of the first-stage second-stage membrane separator 26.

[0029] The permeate side of the first-stage membrane separator 23 and the permeate side of the first-stage membrane separator 26 are both connected to the inlet end of the second-stage gas buffer tank 27. The outlet end of the second-stage gas buffer tank 27 is connected to the inlet end of the second-stage gas booster pump 28. The outlet end of the second-stage gas booster pump 28 is connected to the filtration side of the second-stage membrane separator 29. The permeate side of the second-stage membrane separator 29 is connected to the carbon dioxide liquefaction storage skid 3.

[0030] Dry gas (mainly CO2, N2, and O2) enters the first-stage gas buffer tank 20 and is pressurized by the first-stage gas booster pump 21 to the pressure required for membrane separation. It then passes through the humidification tank 22 to increase humidity (enhancing the polymer membrane separation effect) before entering the first-stage membrane separator 23 for CO2 capture. The gas from the retentate side of the first-stage membrane separator 23 is then pressurized by the second-stage gas buffer tank 24 and the second-stage gas booster pump 25 before entering the second-stage membrane separator 26 for secondary CO2 capture. O2 capture occurs when the decarbonized gas on the retrieval side of the first-stage two-stage membrane separator 26 is vented. Subsequently, the high CO2 concentration gas on the permeate side of the first-stage one-stage membrane separator 23 and the first-stage two-stage membrane separator 26 enters the second-stage gas buffer tank 27. After being pressurized by the second-stage gas booster pump 28, it enters the second-stage membrane separator 29 to achieve CO2 concentration. The decarbonized gas on the retrieval side of the second-stage membrane separator 29 is vented, and the high-purity CO2 product on the permeate side of the second-stage membrane separator 29 enters the carbon dioxide buffer tank 30.

[0031] In this embodiment of the invention, the outlet ends of the first-stage gas buffer tank 20, the first-stage second-stage gas buffer tank 24, and the second-stage gas buffer tank 27 are all equipped with gas flow controllers to control the gas flow rate output to each stage of the membrane separator. The gas pressure is also adjusted by cooperating with the corresponding gas booster pumps to enhance the membrane separation effect and improve the CO2 capture efficiency.

[0032] In this embodiment of the present invention, when the membrane separation material of the first-stage membrane separator 23 is a polymer membrane material, humidification can be achieved through the humidification tank 22 to improve the separation effect. When the membrane separation material is another material, such as a membrane separation material that does not require humidity, the humidification tank 22 can be bypassed (or the humidification tank 22 can be removed directly).

[0033] The carbon dioxide liquefaction storage skid 3 includes a carbon dioxide buffer tank 30, a multi-stage cooling compressor 31, and a liquid carbon dioxide storage tank 32. The inlet of the carbon dioxide buffer tank 30 is connected to the permeate side of the secondary membrane separator 29, the outlet of the carbon dioxide buffer tank 30 is connected to the inlet of the multi-stage cooling compressor 31, and the outlet of the multi-stage cooling compressor 31 is connected to the liquid carbon dioxide storage tank 32.

[0034] The stored gas in the carbon dioxide buffer tank 30 is liquefied by a multi-stage cooling compressor 31 and then stored in a liquid carbon dioxide storage tank 32.

[0035] In this embodiment of the invention, the ship exhaust gas pretreatment skid 1, the carbon dioxide capture skid 2, and the carbon dioxide liquefaction storage skid 3 are all equipped with detection instrument assemblies. The detection instrument assemblies can be respectively installed at the pipeline inlet of each component in the ship exhaust gas pretreatment skid 1, the carbon dioxide capture skid 2, and the carbon dioxide liquefaction storage skid 3. The detection instrument assemblies include at least a pressure gauge and a carbon dioxide concentration detector, which are used to monitor the gas pressure and CO2 concentration in real time, respectively, and provide feedback for the regulation of gas flow and pressure.

[0036] In this embodiment of the invention, the ship exhaust gas pretreatment skid 1, the carbon dioxide capture skid 2, and the carbon dioxide liquefaction storage skid 3 are all modular structures. These skids are integrated into a standard container. They can be stacked on top of each other or separately installed in different standard containers and connected to each other via pipelines using parallel series, vertical arrangement, or other combinations, as long as the ship exhaust gas pretreatment skid 1 is positioned on the ship near the exhaust gas outlet. This modular design significantly reduces the footprint and weight of the entire system.

[0037] Compared with the prior art, the skid-mounted modular marine membrane carbon capture system described in this embodiment of the invention has the following advantages: 1. By setting up a ship exhaust gas pretreatment skid 1, a carbon dioxide capture skid 2, and a carbon dioxide liquefaction and storage skid 3, the absorbed ship exhaust gas is first pretreated to remove dust and desulfurize and denitrify. Then, the pretreated ship exhaust gas is subjected to carbon dioxide capture and compression to obtain high-concentration carbon dioxide. Finally, the high-concentration carbon dioxide input into the carbon dioxide capture skid 2 is subjected to multi-stage cooling and compression to obtain liquefied carbon dioxide and stored. Based on membrane carbon capture, integrated treatment of ship exhaust gas is realized. 2. The ship exhaust gas pretreatment skid 1, carbon dioxide capture skid 2, and carbon dioxide liquefaction storage skid 3 are all modular structures. Through modular design, the footprint and weight of the entire system are greatly reduced. 3. Gas flow controllers are installed at the outlets of the first-stage gas buffer tank 20, the first-stage second-stage gas buffer tank 24, and the second-stage gas buffer tank 27 to control the gas flow rate output to each stage of the membrane separator. The gas pressure is also adjusted by cooperating with the corresponding gas booster pump, which enhances the membrane separation effect and improves the CO2 capture efficiency.

[0038] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0039] Similarly, it should be understood that, in order to simplify this disclosure and aid in understanding one or more aspects of the various utility models, in the above description of exemplary embodiments of the present utility model, various features of the present utility model are sometimes grouped together in a single embodiment, figure, or description thereof. Other embodiments of the present disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and it should be noted that the above embodiments are illustrative of the present utility model and not restrictive of it, and that alternative embodiments can be devised by those skilled in the art without departing from its scope.

Claims

1. A skid-mounted modular marine membrane carbon capture system, characterized in that, The skid-mounted modular marine membrane carbon capture system includes: a ship exhaust gas pretreatment skid, a carbon dioxide capture skid, and a carbon dioxide liquefaction and storage skid. The ship exhaust gas pretreatment skid is connected to the carbon dioxide capture skid, and the carbon dioxide capture skid is connected to the carbon dioxide liquefaction and storage skid. The ship exhaust gas pretreatment skid is installed at the ship's exhaust gas outlet and is used to pretreat the ship exhaust gas entering through the exhaust gas outlet for dust removal, desulfurization, and denitrification. The carbon dioxide capture skid is used to capture and compress carbon dioxide from the pretreated ship exhaust gas to obtain high-concentration carbon dioxide. The carbon dioxide liquefaction and storage skid is used to perform multi-stage cooling and compression on the high-concentration carbon dioxide input from the carbon dioxide capture skid to obtain liquefied carbon dioxide for storage.

2. The skid-mounted modular marine membrane carbon capture system according to claim 1, characterized in that: The ship exhaust gas pretreatment skid includes a high-temperature resistant gas transfer pump, a cold water spray tower, an adsorption-type desulfurization tank, an adsorption-type denitrification tank, and a dehumidifier / mist eliminator. The inlet of the high-temperature resistant gas transfer pump is located at the ship's exhaust outlet to absorb the exhaust gas entering through the outlet. The outlet of the high-temperature resistant gas transfer pump is connected to the inlet of the cold water spray tower. The upper part of the cold water spray tower has an outlet, which is connected to the inlet of the adsorption-type desulfurization tank. The outlet of the adsorption-type desulfurization tank is connected to the inlet of the adsorption-type denitrification tank. The outlet of the adsorption-type denitrification tank is connected to the inlet of the dehumidifier / mist eliminator, and the outlet of the dehumidifier / mist eliminator is connected to the carbon dioxide capture skid.

3. The skid-mounted modular marine membrane carbon capture system according to claim 2, characterized in that: The ship exhaust gas pretreatment skid also includes a cooling water tank and a circulating water pump. A circulation pipe is provided in the middle of the tower body of the cold water spray tower. The circulation pipe is connected to the cooling water tank through a circulation pipeline, and a circulating water pump is provided on the circulation pipeline.

4. The skid-mounted modular marine membrane carbon capture system according to claim 2, characterized in that: The carbon dioxide capture skid includes a first-stage gas buffer tank, a first-stage gas booster pump, a humidifier tank, a first-stage membrane separator, a second-stage gas buffer tank, a second-stage gas booster pump, and a second-stage membrane separator. The inlet of the first-stage gas buffer tank is connected to the outlet of the dehumidifier / mist eliminator, and the outlet of the first-stage gas buffer tank is connected to the inlet of the first-stage gas booster pump. The outlet of the first-stage gas booster pump is connected to the inlet of the humidifier tank, and the outlet of the humidifier tank is connected to the retention side of the first-stage membrane separator. The retention side of the first-stage membrane separator is connected to the inlet of the second-stage gas buffer tank, and the outlet of the second-stage gas buffer tank is connected to the inlet of the second-stage gas booster pump. The outlet of the second-stage gas booster pump is connected to the retention side of the second-stage membrane separator.

5. The skid-mounted modular marine membrane carbon capture system according to claim 4, characterized in that: The carbon dioxide capture skid also includes a secondary gas buffer tank, a secondary gas booster pump, and a secondary membrane separator. The permeate side of the first-stage membrane separator and the permeate side of the first-stage membrane separator are both connected to the inlet end of the secondary gas buffer tank. The outlet end of the secondary gas buffer tank is connected to the inlet end of the secondary gas booster pump, and the outlet end of the secondary gas booster pump is connected to the filtration side of the secondary membrane separator. The permeate side of the secondary membrane separator is connected to the carbon dioxide liquefaction storage skid.

6. The skid-mounted modular marine membrane carbon capture system according to claim 5, characterized in that: Gas flow controllers are installed at the outlets of the first-stage gas buffer tank, the first-stage second-stage gas buffer tank, and the second-stage gas buffer tank.

7. The skid-mounted modular marine membrane carbon capture system according to claim 5, characterized in that: The carbon dioxide liquefaction storage skid includes a carbon dioxide buffer tank, a multi-stage cooling compressor, and a liquid carbon dioxide storage tank. The inlet of the carbon dioxide buffer tank is connected to the permeate side of the secondary membrane separator, the outlet of the carbon dioxide buffer tank is connected to the inlet of the multi-stage cooling compressor, and the outlet of the multi-stage cooling compressor is connected to the liquid carbon dioxide storage tank.

8. The skid-mounted modular marine membrane carbon capture system according to claim 1, characterized in that: The ship exhaust gas pretreatment skid, carbon dioxide capture skid, and carbon dioxide liquefaction storage skid are all equipped with detection instrument assemblies, which include at least pressure gauges and carbon dioxide concentration detectors.

9. The skid-mounted modular marine membrane carbon capture system according to claim 1, characterized in that: The ship exhaust gas pretreatment skid, carbon dioxide capture skid, and carbon dioxide liquefaction storage skid are all modular structures, and are integrated into a standard container.

10. The skid-mounted modular marine membrane carbon capture system according to claim 9, characterized in that: The ship exhaust gas pretreatment skid, carbon dioxide capture skid, and carbon dioxide liquefaction storage skid are respectively installed in different standard containers and connected to each other by pipelines in a combination of parallel series or vertical arrangement.

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