Pyrolysis gas conveying system and method comprising coupled carbon capture assembly

Abstract

A pyrolysis gas conveying system comprising a coupled carbon capture assembly. The pyrolysis gas conveying system comprises: a pyrolysis gas purification assembly (1) used for purifying a pyrolysis gas, a carbon capture assembly (2) used for capturing carbon dioxide in the passing air, a methanation reaction assembly (3) used for receiving the purified pyrolysis gas and carbon dioxide to undergo a methanation reaction for increasing a methane proportion in the pyrolysis gas, and a follow-up flow mixing and transport assembly (4) connected to the methanation reaction assembly (3) and used for removing carbon dioxide from a reaction gas generated by the methanation reaction and mixing the reaction gas with natural gas in a specified ratio to meet the requirements of different user terminals. A pyrolysis gas conveying method comprising a coupled carbon capture assembly uses the pyrolysis gas conveying system comprising the coupled carbon capture assembly. By means of such arrangement, the carbon dioxide captured by the carbon capture assembly is used as a methanation carbon source, and the pyrolysis gas undergoes the methanation reaction by means of a supplementary carbon source, thereby increasing the methane proportion, and reducing a hydrogen proportion, the natural gas is supplemented by means of the follow-up flow mixing and transport assembly on the basis of the requirements of the user terminals to adjust a hydrogen doping proportion, and the gas is conveyed to different user terminals by means of a natural gas pipeline.

Description

Pyrolysis gas delivery system and delivery method coupled with carbon capture assembly

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on December 7, 2023, with application number 202311676872.5 and invention name “Pyrolysis Gas Delivery System and Delivery Method Coupled with Carbon Capture Components”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the technical field of pyrolysis gas transportation, and in particular to a pyrolysis gas transportation system and a transportation method coupled with a carbon capture component. Background Art

[0004] In recent years, greenhouse gas emissions have continued to increase, exacerbating climate change. Carbon capture and storage (CCS) technology has become very mature after years of development. However, the direct utilization efficiency of captured CO2 is low, and storage requires long-distance transportation, which is costly. Furthermore, when CO2 is stored in geology, the irregularities of geological strata and unpredictable geological movements may cause CO2 to leak and overflow into the surface air, causing a greenhouse effect and ecological pollution, thereby affecting the stability of the entire ecosystem and posing a threat to the safety of animals, plants, and humans. In the context of "dual carbon," the development and utilization of natural gas is a necessary resource guarantee for long-term development. Currently, the proportion of natural gas consumption is increasing, and there has long been a supply-demand contradiction between natural gas production and consumption. The natural gas produced cannot meet the growing consumer demand.

[0005] my country's coal pyrolysis technology has developed rapidly since independent research and development began in the 1950s. The pyrolysis process produces a large amount of pyrolysis gas, which has a high calorific value and is primarily composed of hydrogen and methane. While pyrolysis gas is a hydrogen-rich gas with great potential for application, its high hydrogen content makes it difficult to transport over long distances, and the cost of building dedicated pipelines is very high. Producing hydrogen and ammonia from pyrolysis gas is also expensive and requires sophisticated equipment. Currently, pyrolysis gas utilization is low, particularly in the coking industry, where approximately 20% is directly discharged or flared. This treatment method not only exacerbates the greenhouse effect but also results in resource waste and energy inefficiency.

[0006] Under the background of "dual carbon", how to reduce carbon dioxide emissions and rationally utilize the captured carbon dioxide to expand the overall benefits of the system is a technical problem that technical personnel in this field urgently need to solve.

[0007] Summary of the Invention

[0008] The present application aims to at least partially address one of the technical issues in the related art. To this end, the present application aims to propose a pyrolysis gas delivery system and method coupled with a carbon capture assembly, wherein carbon dioxide captured by the carbon capture assembly serves as a methanogenic carbon source, and the pyrolysis gas undergoes a methanogenic reaction by supplementing the carbon source, thereby increasing the methane ratio and reducing the hydrogen ratio. The pyrolysis gas is then delivered to different user ends via a natural gas pipeline by supplementing natural gas with natural gas according to user demand through a flow-following blending and transportation assembly.

[0009] To achieve the above objectives, the present application proposes a pyrolysis gas delivery system coupled with a carbon capture assembly, comprising:

[0010] A pyrolysis gas purification component, which is used to purify pyrolysis gas;

[0011] A carbon capture component is used to capture CO2 from the passing air;

[0012] a methanation reaction component connected to the pyrolysis gas purification component and the carbon capture component, and receiving the purified pyrolysis gas and CO2 for a methanation reaction to increase the methane ratio in the pyrolysis gas; and

[0013] The flow-following mixing and transport component is connected to the methanation reaction component, removes CO2 from the reaction gas produced by the methanation reaction and mixes it with natural gas in a set ratio to meet the needs of different user ends.

[0014] In some embodiments, the methanation reaction component and the carbon capture component are connected to each other through a molten salt component for heat exchange, and the heat generated by the methanation reaction is used to desorb the CO2 captured in the carbon capture component.

[0015] In some embodiments, the pyrolysis gas purification component includes an activated carbon processor and a fine deoiling and naphthalene removal device arranged upstream and downstream in sequence. The pressurized pyrolysis gas passes through the activated carbon processor and the fine deoiling and naphthalene removal device in sequence to obtain purified pyrolysis gas and is stored in a purified gas storage tank.

[0016] In some embodiments, the pyrolysis gas purification component also includes a hydrodesulfurizer and a sulfur recovery device, wherein the hydrodesulfurizer is connected between the fine deoiling and naphthalene removal device and the purified gas storage tank, and is used to desulfurize the pyrolysis gas output from the fine deoiling and naphthalene removal device and process it into sulfur for storage in the sulfur recovery device.

[0017] In some embodiments, the carbon capture assembly includes a temperature swing adsorption desorber and a CO2 gas storage tank arranged in sequence; wherein the temperature swing adsorption desorber is provided with a temperature swing adsorption desorption material, which can capture CO2 in the passing air during the adsorption stage, and when the temperature of the temperature swing adsorption desorber is increased during the desorption stage, the temperature swing adsorption desorption material desorbs the adsorbed CO2 gas and stores it in the CO2 gas storage tank.

[0018] In some embodiments, the carbon capture assembly further includes an air compressor, which compresses the passing air into pressurized air for increasing the density of the air passing through the temperature swing adsorption desorber.

[0019] In some embodiments, the methanation reaction component includes a methanation reactor, which is connected to the purified gas storage tank and the CO2 gas storage tank, and the purified pyrolysis gas and CO2 undergo a methanation reaction in the methanation reactor; the molten salt component is connected to the methanation reactor for heat exchange, and is used to recover the heat generated by the methanation reaction, and use the heat to increase the temperature of the temperature swing adsorption desorber during the desorption stage.

[0020] In some embodiments, the follow-up flow blending and transportation component includes a steam-water separator, a decarbonization device, a follow-up flow blending device and a user end arranged in sequence; wherein the steam-water separator is connected to the methanation reactor; the reaction gas output by the methanation reactor passes through the steam-water separator and the decarbonization device to remove water vapor and CO2 and then enters the follow-up flow blending device; a set proportion of natural gas is input into the follow-up flow blending device, and the reaction gas is mixed with the natural gas and then transmitted to different user ends.

[0021] In some embodiments, a carbon transport pipeline for transporting CO2 is connected between the decarbonization device and the methanation reactor, for transporting the CO2 removed by the decarbonization device to the methanation reactor.

[0022] In some embodiments, a drying compressor is connected between the decarbonization device and the follow-up flow mixing device to dry and compress the reaction gas after the CO2 is removed.

[0023] In some embodiments, a method for transporting pyrolysis gas coupled with a carbon capture assembly, utilizing the pyrolysis gas transport system described in any of the above embodiments to transport pyrolysis gas, includes:

[0024] The purified pyrolysis gas and the CO2 in the air captured by the carbon capture component undergo a methanation reaction in the methanation reaction component to increase the methane ratio in the pyrolysis gas;

[0025] After removing CO2 from the reaction gas produced by the methanation reaction, the volume percentage of hydrogen is 2% to 20%; the reaction gas and natural gas are mixed according to a set ratio in the follow-up flow mixing and transportation component. Taking the mixture of reaction gas and natural gas as the benchmark, when the volume percentage of hydrogen is 2% to 10%, the pyrolysis gas of the mixed gas can be used as domestic gas; when the volume percentage of hydrogen is 10% to 20%, it is used as transportation gas and combustion for power generation to meet the needs of different user ends.

[0026] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0028] FIG1 is a schematic structural diagram of a pyrolysis gas delivery system proposed in one embodiment of the present application;

[0029] FIG2 is a schematic structural diagram of a pyrolysis gas delivery system according to an embodiment of the present application;

[0030] FIG3 is a schematic structural diagram of a pyrolysis gas delivery system proposed in another embodiment of the present application;

[0031] FIG4 is a flow chart of a method for transporting pyrolysis gas coupled with a carbon capture assembly according to an embodiment of the present application;

[0032] In the figure, 1. Pyrolysis gas purification component; 2. Carbon capture component; 3. Methanation reaction component; 4. Follow-up flow mixing and transportation component; 5. Molten salt component; 6. Activated carbon processor; 7. Refined deoiling and naphthalene removal device; 8. Purification gas storage tank; 9. Hydrodesulfurization device; 10. Sulfur recovery device; 11. Temperature swing adsorption desorber; 12. CO2 gas storage tank; 13. Air compressor; 14. Methanation reactor; 15. Steam-water separator; 16. Decarbonization device; 17. Follow-up flow mixing device; 18. User end; 19. Carbon transmission pipeline; 20. Drying compressor. DETAILED DESCRIPTION

[0033] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present application and are not to be construed as limiting the present application. On the contrary, the embodiments of the present application include all variations, modifications, and equivalents that fall within the spirit and scope of the appended claims.

[0034] To achieve the above-mentioned purpose, the present application proposes a pyrolysis gas transportation system coupled with a carbon capture component 2 as shown in Figure 1, comprising: a pyrolysis gas purification component 1, a carbon capture component 2, a methanation reaction component 3 and a follow-up flow mixing and transportation component 4; wherein the pyrolysis gas purification component 1 is used to purify the pyrolysis gas; the carbon capture component 2 is used to capture CO2 in the passing air; the methanation reaction component 3 is connected to the pyrolysis gas purification component 1 and the carbon capture component 2 respectively, and receives the purified pyrolysis gas and CO2 for methanation reaction, so as to increase the methane ratio in the pyrolysis gas; the follow-up flow mixing and transportation component 4 is connected to the methanation reaction component 3, removes CO2 from the reaction gas generated by the methanation reaction, and mixes it with natural gas according to a set ratio to meet the needs of different user ends 18.

[0035] This application solves the problem of carbon capture and utilization after carbon capture is applied to the purified pyrolysis gas, which is then carbonized by a carbon capture assembly 2 to generate a methanation reaction, thereby increasing the methane content in the pyrolysis gas. Furthermore, the CO2 captured by the carbon capture assembly 2 is used as a carbon source for the methanation reaction. Therefore, this application increases the methane content in the pyrolysis gas and reduces the hydrogen content, controlling the hydrogen content to 2% to 20%. The gas is then transported to the user end 18 via a natural gas pipeline. Pyrolysis gas with a hydrogen content of 2% to 10% can be used as domestic fuel, while pyrolysis gas with a hydrogen content of 10% to 20% can be used as transportation gas and for combustion power generation. Therefore, this application solves the problem of pyrolysis gas being difficult to fully utilize despite its high hydrogen content and calorific value by being transported to the user end 18 via a natural gas pipeline. This also addresses the peak demand and resource mismatch issues. Furthermore, the dynamic flow blending and transportation assembly 4 can adjust the hydrogen content of the reaction gas produced by the methanation reaction, after removing CO2, in real time by adding natural gas, thereby achieving the different hydrogen / methane mixtures required by different user ends 18.

[0036] As shown in FIG1 , a pyrolysis gas purification component 1 inputs pressurized pyrolysis gas to be processed, removes impurities from the pyrolysis gas, and purifies the pyrolysis gas. The output end of the pyrolysis gas purification component 1 is connected to the methanation reaction component 3, and the purified pyrolysis gas can be output to the methanation reaction component 3. At the same time, the carbon capture component 2 captures CO2 from the passing air and separates the CO2. The output end of the carbon capture component 2 is connected to the methanation reaction component 3, and the separated CO2 can be output to the methanation reaction component 3. The purified pyrolysis gas and CO2 undergo a methanation reaction in the methanation reaction component 3. The dynamic flow mixing and transportation component 4 is connected to the methanation reaction component 3. The reaction gas produced by the methanation reaction removes CO2 and is mixed with natural gas in a set ratio to meet the needs of different user terminals 18.

[0037] In addition, the methanation reaction component 3 is connected to the carbon capture component 2 for heat exchange via the molten salt component 5, and the heat generated by the methanation reaction is used for desorption of CO2 captured in the carbon capture component 2. Therefore, the heat generated by the methanation reaction is used for desorption of CO2 captured in the carbon capture component 2, which greatly reduces the energy consumption in the desorption stage.

[0038] In some embodiments, the pyrolysis gas purification component 1 includes an activated carbon processor 6 and a fine deoiling and naphthalene removal device 7 arranged upstream and downstream in sequence. The pressurized pyrolysis gas passes through the activated carbon processor 6 and the fine deoiling and naphthalene removal device 7 in sequence to obtain purified pyrolysis gas and is stored in a purified gas storage tank 8.

[0039] Wherein, pyrolysis gas purification assembly 1 comprises activated carbon processor 6 and refined de-oiling and naphthalene removing device 7, wherein the outlet of activated carbon processor 6 is connected to the inlet of refined de-oiling and naphthalene removing device 7, pyrolysis gas composition is complex, hydrogen and methane ratio is about 87%, also contains some impurities, pyrolysis gas can be compressed by compressor to generate pressurized pyrolysis gas, pressurized pyrolysis gas is roughly removed impurities such as tar, naphthalene and deuterium in the pyrolysis gas by activated carbon processor 6, and then enters refined de-oiling and naphthalene removing device 7 for further purification. As shown in Figure 2, compressor, activated carbon processor 6 and refined de-oiling and naphthalene removing device 7 are connected in sequence upstream and downstream, and pressurized pyrolysis gas passes through activated carbon processor 6 and refined de-oiling and naphthalene removing device 7 successively to obtain purified pyrolysis gas and is stored in purification gas storage tank 8. In addition, in some schemes, the pyrolysis gas purification component 1 also includes a hydrodesulfurizer 9 and a sulfur recovery device 10 as shown in Figure 3, wherein the hydrodesulfurizer 9 is connected between the refined deoiling and naphthalene removal device 7 and the purified gas storage tank 8, and is used to desulfurize the pyrolysis gas output by the refined deoiling and naphthalene removal device 7 and process it into sulfur and store it in the sulfur recovery device 10. In this embodiment, the removed sulfur is further recovered and processed into sulfur, which can increase the profit of this system.

[0040] In some embodiments, the carbon capture assembly 2 includes a temperature swing adsorption desorber 11 and a CO2 gas storage tank 12 arranged in sequence; wherein the temperature swing adsorption desorber 11 is provided with a temperature swing adsorption desorption material, which can capture CO2 in the passing air during the adsorption stage, and when the temperature of the temperature swing adsorption desorber 11 is increased during the desorption stage, the temperature swing adsorption desorption material desorbs the adsorbed CO2 gas and stores it in the CO2 gas storage tank 12.

[0041] The carbon capture assembly 2 includes a temperature swing adsorption desorber 11 and a CO2 storage tank 12. The temperature swing adsorption desorber 11 is provided with a temperature swing adsorption desorption material. During the adsorption phase, the temperature swing adsorption desorption material can capture CO2 in the passing air at low temperatures and adsorb the CO2 in the temperature swing adsorption desorption material. During the desorption phase, the temperature swing adsorption desorption material desorbs the captured CO2 at high temperatures to obtain CO2 gas, which is stored in the CO2 storage tank 12. In some embodiments, the carbon capture assembly 2 further includes an air compressor 13, which compresses the passing air into pressurized air and increases the density of the air passing through the temperature swing adsorption desorber 11. As shown in the figure, the air compressor 13, the temperature swing adsorption desorber 11, and the CO2 storage tank 12 are connected in sequence upstream and downstream, and the temperature swing adsorption desorber 11 is provided with a temperature swing adsorption desorption material.

[0042] In some embodiments, the methanation reaction component 3 includes a methanation reactor 14, which is connected to the purified gas storage tank 8 and the CO2 gas storage tank 12, and the purified pyrolysis gas and CO2 undergo a methanation reaction in the methanation reactor 14; the molten salt component 5 is connected to the methanation reactor 14 for heat exchange, for recovering the heat generated by the methanation reaction, and in the desorption stage, the heat is used to increase the temperature of the temperature swing adsorption desorber 11.

[0043] Methanation reaction assembly 3 includes a methanation reactor 14. The input ends of methanation reactor 14 are connected to the purified gas storage tank 8 and the CO2 gas storage tank 12, respectively, for receiving CO2 gas from the CO2 gas storage tank 12 and purified pyrolysis gas from the purified gas storage tank 8. A regulating valve and flowmeter are provided between the purified gas storage tank 8 and methanation reactor 14 to regulate the flow of pyrolysis gas into the purified gas storage tank 8. A regulating valve and flowmeter are also provided between the CO2 gas storage tank 12 and methanation reactor 14 to regulate the flow of CO2 gas into the purified gas storage tank 8. The purified pyrolysis gas and CO2 undergo a methanation reaction in methanation reactor 14 to produce methane, thereby reducing the hydrogen content in the pyrolysis gas and increasing the methane content, thereby adapting to the transportation of hydrogen-mixed methane gas via natural gas pipelines. In addition, the methanation reaction is a highly exothermic reaction that releases a large amount of heat during this process. Therefore, the heat released during the methanation reaction can be recovered by the molten salt component 5 through heat exchange connection with the methanation reactor 14 and the temperature swing adsorption desorber 11, and used to increase the temperature swing adsorption desorber 11 during the desorption stage of the temperature swing adsorption desorption material. The present application makes full use of the system energy and reduces the operating cost of the entire device. The volumetric heat storage density of molten salt is 8 times that of water. Under the same heat storage capacity, the volume of the molten salt heat storage tank is one-eighth of the water heat storage tank. Therefore, the use of molten salt heat storage occupies a small area, and the initial investment of the heat storage system can be reduced by more than 20%. In addition, the molten salt heat storage temperature is high and the grade loss is small.

[0044] In some embodiments, the follow-up flow blending and transportation component 4 includes a steam-water separator 15, a decarbonization device 16, a follow-up flow blending device 17 and a user end 18 arranged in sequence; wherein the steam-water separator 15 is connected to the methanation reactor 14; the reaction gas output by the methanation reactor 14 passes through the steam-water separator 15 and the decarbonization device 16 to remove water vapor and CO2 and then enters the follow-up flow blending device 17; a set proportion of natural gas is input into the follow-up flow blending device 17, and the reaction gas is mixed with the natural gas and then transmitted to different user ends 18.

[0045] Among them, the follow-up flow mixing and transportation component 4 includes a steam-water separator 15, a decarbonization device 16, a follow-up flow mixing device 17 and a user end 18 arranged in sequence upstream and downstream. The steam-water separator 15 is connected to the methanation reactor 14 and is used to receive the reaction gas output by the methanation reactor 14. In addition to generating methane, the methanation reaction also produces a certain amount of water vapor. The reaction gas enters the steam-water separator 15 after molten salt heat exchange to achieve water vapor separation. After the water vapor is separated, the reaction gas removes carbon dioxide in the decarbonization device 16 and the purified gas is hydrogen-mixed methane gas. The hydrogen-mixed methane gas enters the follow-up flow mixing device 17 through a regulating valve and a flow meter. The natural gas supplemented outside the system can be input into the follow-up flow mixing device 17 in real time. The supplemented natural gas can adjust the hydrogen ratio in the mixed gas in real time to achieve different hydrogen / methane mixed gases required by different user ends 18. The hydrogen ratio in different hydrogen / methane mixtures is controlled at 2% to 20%, and then transported to the user end 18 through a natural gas pipeline. Pyrolysis gas with a hydrogen ratio of 2% to 10% can be used as domestic gas, and pyrolysis gas with a hydrogen ratio of 10% to 20% can be used as traffic gas and combustion for power generation.

[0046] In some embodiments, a carbon transport pipeline 19 for transporting CO 2 is connected between the decarbonization device 16 and the methanation reactor 14 , and is used to transport the CO 2 removed by the decarbonization device 16 to the methanation reactor 14 .

[0047] A carbon transport pipeline 19 for transporting CO2 is connected between the decarbonization device 16 and the methanation reactor 14. After the reaction gas, which has separated water vapor, removes carbon dioxide in the decarbonization device 16, the carbon dioxide is then delivered to the methanation reactor 14 through the carbon transport pipeline 19 connecting the decarbonization device 16 and the methanation reactor 14. In addition, in some embodiments, a drying and compressor 20 is connected between the decarbonization device 16 and the follow-up flow blending device 17 to dry and compress the reaction gas after the CO2 is removed.

[0048] In this embodiment, carbon is added to the pyrolysis gas through a methanation reaction to control the hydrogen content of the mixed gas. Natural gas is then added through a flow-following blending device 17 to adjust the ratio based on the needs of the specific user end 18. The mixture is then transported to the user end 18 via different pipelines. Alternative methods include directly mixing natural gas and pyrolysis gas to adjust the hydrogen content of the mixed gas; or using only the methanation reaction to adjust the mixture content. In this application, the hydrogen content of the mixed gas is 2% to 24%, which is suitable for safe long-distance transportation.

[0049] In some embodiments, a method for transporting pyrolysis gas coupled with a carbon capture assembly 2 is shown in FIG4 , and the method utilizes the pyrolysis gas transport system of any of the above embodiments to transport pyrolysis gas, including:

[0050] S1: The purified pyrolysis gas and the CO2 in the air captured by the carbon capture component 2 undergo a methanation reaction in the methanation reaction component 3 to increase the methane content of the pyrolysis gas;

[0051] S2: After removing CO2 from the reaction gas produced by the methanation reaction, the volume percentage of hydrogen is 2% to 20%; the reaction gas and natural gas are mixed according to the set ratio in the follow-up flow mixing and transportation component. Taking the mixture of reaction gas and natural gas as the benchmark, when the volume percentage of hydrogen is 2% to 10%, the pyrolysis gas of the mixed gas can be used as domestic gas; when the volume percentage of hydrogen is 10% to 20%, it is used as transportation gas and combustion for power generation to meet the needs of different user ends.

[0052] It should be noted that, in the description of this application, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0053] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0054] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0055] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A pyrolysis gas delivery system coupled with a carbon capture assembly, characterized in that: include: A pyrolysis gas purification component, which is used to purify pyrolysis gas; A carbon capture module to capture CO2 from passing air; A methanation reaction component, which is connected to the pyrolysis gas purification component and the carbon capture component, and receives the purified pyrolysis gas and CO2 for methanation reaction, so as to increase the methane ratio in the pyrolysis gas; as well as The dynamic flow mixing and transport component is connected to the methanation reaction component, removes CO2 from the reaction gas produced by the methanation reaction and mixes it with natural gas in a set ratio to meet the needs of different user ends.

2. The pyrolysis gas delivery system according to claim 1, characterized in that: The methanation reaction component is connected to the carbon capture component through a molten salt component for heat exchange, and the heat generated by the methanation reaction is used for desorption of CO2 captured in the carbon capture component.

3. The pyrolysis gas delivery system according to claim 1 or 2, characterized in that: The pyrolysis gas purification component comprises an activated carbon processor and a refined de-oiling and de-naphthalene device arranged in sequence upstream and downstream. The pressurized pyrolysis gas passes through the activated carbon processor and the refined de-oiling and de-naphthalene device in sequence to obtain purified pyrolysis gas which is stored in a purified gas storage tank.

4. The pyrolysis gas delivery system according to claim 3, characterized in that: The pyrolysis gas purification component also includes a hydrodesulfurizer and a sulfur recovery device, wherein the hydrodesulfurizer is connected between the refined deoiling and naphthalene removal device and the purified gas storage tank, and is used to desulfurize the pyrolysis gas output by the refined deoiling and naphthalene removal device and process it into sulfur to be stored in the sulfur recovery device.

5. The pyrolysis gas delivery system according to claim 2, characterized in that: The carbon capture assembly includes a temperature swing adsorption desorber and a CO2 gas storage tank which are arranged in sequence; wherein the temperature swing adsorption desorber is provided with a temperature swing adsorption desorption material, which can capture CO2 in the passing air during the adsorption stage, and when the temperature of the temperature swing adsorption desorber is increased during the desorption stage, the temperature swing adsorption desorption material desorbs the adsorbed CO2 gas and stores it in the CO2 gas storage tank.

6. The pyrolysis gas delivery system according to claim 5, characterized in that: The carbon capture assembly further includes an air compressor, which compresses the passing air into pressurized air for increasing the density of the air passing through the temperature swing adsorption desorber.

7. The pyrolysis gas delivery system according to claim 5, characterized in that: The methanation reaction component includes a methanation reactor, which is connected to the purified gas storage tank and the CO2 gas storage tank, and the purified pyrolysis gas and CO2 undergo a methanation reaction in the methanation reactor; the molten salt component is connected to the methanation reactor for heat exchange, and is used to recover the heat generated by the methanation reaction, and in the desorption stage, the heat is used to increase the temperature of the temperature-swinging adsorption desorber.

8. The pyrolysis gas delivery system according to claim 3, characterized in that: The follow-up flow mixing and transport component comprises a steam-water separator, a decarbonization device, a follow-up flow mixing device and a user end which are arranged in sequence; wherein the steam-water separator is connected to the methanation reactor; the reaction gas output by the methanation reactor passes through the steam-water separator and the decarbonization device to remove water vapor and CO2 and then enters the follow-up flow mixing device; A set proportion of natural gas is input into the follow-up flow mixing device, and the reaction gas is mixed with the natural gas and then transmitted to different user ends.

9. The pyrolysis gas delivery system according to claim 8, characterized in that: A carbon transport pipeline for transporting CO2 is connected between the decarbonization device and the methanation reactor, which is used to transport the CO2 removed by the decarbonization device to the methanation reactor.

10. The pyrolysis gas delivery system according to claim 8, characterized in that: A drying compressor is connected between the decarbonization device and the follow-up flow mixing device, which is used to dry and compress the reaction gas after the CO2 is removed.

11. A method for delivering pyrolysis gas coupled with a carbon capture assembly, characterized in that: The method of transporting pyrolysis gas using the pyrolysis gas transport system described in any one of claims 1 to 10 includes: The purified pyrolysis gas and CO2 in the air captured by the carbon capture component undergo a methanation reaction in a methanation reaction component to increase the methane ratio in the pyrolysis gas; After removing CO2 from the reaction gas produced by the methanation reaction, the volume percentage of hydrogen is 2% to 20%; the reaction gas and natural gas are mixed in a follow-up flow mixing and transportation component according to a set ratio, wherein the mixed gas of reaction gas and natural gas is used as a benchmark, when the volume percentage of hydrogen is 2% to 10%, the mixed gas pyrolysis gas can be used as domestic fuel gas; when the volume percentage of hydrogen is 10% to 20%, it is used as transportation gas and combustion for power generation, to meet the needs of different user ends.

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