A multi-module plasma unit combined conversion greenhouse gas device

Abstract

The application discloses a device for jointly converting greenhouse gas by multiple modules of plasma units, which comprises five parts of a plasma power supply unit, a gas supply unit, a warm plasma reforming unit, a separation and circulation unit and a cold plasma hydrogenation unit. The warm plasma reforming unit is composed of a metal cavity frame, a gas interface, a water-cooled interlayer, a voltage configuration and a turbulence component, and is used for realizing direct conversion of greenhouse gas under multiple warm plasma actions of spark, sliding arc and plasma torch. The separation and circulation unit is composed of a circulating pump, a bag-type dust collector, a dehydrocarbon column, a pressure swing adsorption and a heat exchange system, and is used for realizing purification and shunting of primary products and heat exchange between warm plasma and cold plasma. The cold plasma hydrogenation unit is composed of a dielectric barrier discharge array and a post-stage separation system, and is used for realizing fine synthesis of the purified primary products. The application achieves ideal indexes in conversion rate, processing flux and selectivity.

Description

Technical Field

[0001] This invention belongs to the field of greenhouse gas conversion technology, specifically relating to a device for the combined conversion of greenhouse gases using multiple plasma modules. Background Technology

[0002] The low-carbon and clean transformation of industrial production plays a crucial role in reducing carbon emission pressure and improving economic efficiency. Currently, carbon capture, utilization, and storage (CCUS) technologies developed based on the characteristics of various industrial production processes have become an important direction for carbon emission reduction. Current research focuses primarily on end-of-pipe carbon reduction, targeting carbon emission sources such as direct industrial exhaust gases for separation and decarbonization. Related carbon capture processes and industries are becoming increasingly mature. However, the extremely high chemical stability of carbon dioxide makes activation and conversion difficult under mild conditions. Technologies such as thermocatalysis, photocatalysis, electrocatalysis, and bio-fermentation suffer from drawbacks such as complex processes, high material costs, low reaction throughput, and uncontrollable processes, making direct industrial application difficult. Currently, captured carbon resources are mostly disposed of through landfill mineralization, requiring additional storage costs in current clean industrial production, impacting overall techno-economic viability and development prospects. Low-temperature discharge plasma technology can overcome the limitations of traditional thermodynamic equilibrium, has lower energy consumption, and enables in-situ CO2 conversion and utilization. Currently, most plasma carbon conversion routes employ low-temperature plasma technology to induce CO2 excitation, dissociation, and ionization, achieving near-room-temperature synthesis of syngas and liquid chemicals through CO2+H2 and CO2+CH4 reforming routes. Despite the advantages of discharge plasma technology, it still faces the following challenges: ① A single plasma unit cannot meet the needs of processing various types of raw materials and producing targeted products; moreover, the composition of plasma products is complex, requiring separation and purification; ② There is a lack of integrated, functionalized, and modular technologies for plasma CO2 conversion systems based on specific scenario requirements. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention proposes a device for the combined conversion of greenhouse gases using multiple modular plasma units. By connecting a warm plasma unit with high throughput and high conversion rate in series with a cold plasma unit that is easily coupled to a catalyst, efficient conversion of reactants and high-value utilization of carbon resources are simultaneously achieved over a wide throughput range. Furthermore, a separation and recycling unit is integrated between the conversion units to separate and purify primary and final products during the reaction process, while also recycling the reaction heat between the units.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A device for the combined conversion of greenhouse gases using multiple plasma modules includes a plasma power supply unit, a gas supply unit, a warm plasma reforming unit, a separation and circulation unit, and a cold plasma hydrogenation unit. The plasma power supply unit includes multiple plasma power supplies, a signal generator, and a high-voltage transmission line; the plasma power supply on the signal generator transmits the corresponding high-voltage pulse signal to the plasma reactor through the high-voltage transmission line; The gas supply unit includes an external gas source interface, a ball valve, a flow controller, a mixing tank, stainless steel pipelines, a demineralized water storage tank, and a heating and gasification pipeline. The external gas source interface is directly connected to a high-pressure gas cylinder, a small gas storage device, or a gas transmission pipeline. The ball valve controls the delivery of hydrogen-rich feed gas (pipeline natural gas, fermentation biogas) and carbon-rich feed gas (industrial waste gas, captured CO2) to the flow controller. After being mixed in the mixing tank, the mixture is introduced into the inlet of the warm plasma unit. The warm plasma reforming unit comprises a metal cavity frame, an air inlet, a heat exchange jacket, a variable high-voltage electrode, a graphite electrode, an insulating attachment layer, an electromagnetic coil, a coil power supply, a plasma power supply, a turbulence fan, a converged air outlet, a circulating water coolant outlet, and a circulating water coolant inlet. The separation and circulation unit is divided into a material circulation section and a heat circulation section. The material circulation section consists of stainless steel pipelines, a vacuum pump, a bag filter, a deacetylation tower, a light hydrocarbon removal tower, a pressure swing adsorption unit, and a small gas storage tank. The heat circulation section consists of a heat exchanger, heat exchange pipelines, and heat exchange fluid. The cold plasma reforming unit includes a plasma unit, stainless steel piping, a flow equalizer, an array-type media barrier reactor, a bag filter, a gas-liquid separator, and a liquid storage tank. Furthermore, in the aforementioned device for the joint conversion of greenhouse gases using multi-module plasma units, the plasma power supply is used to excite the generation of low-temperature plasma in the warm plasma reforming and cold plasma hydrogenation units, and is one of a DC power supply, a high-frequency AC power supply, a microsecond pulse power supply, or a nanosecond pulse power supply.

[0005] Furthermore, in the aforementioned multi-module plasma unit for the joint conversion of greenhouse gases, the raw materials are reacted in a warm plasma reforming unit to generate syngas and a small amount of low-carbon hydrocarbons. The syngas content after reforming is increased by a material separation and recycling device and used as raw material in a cold plasma hydrogenation unit. The syngas is then reacted in a plasma catalytic synergistic environment to generate liquid fuel, which is then stored or transported after primary purification.

[0006] Furthermore, the aforementioned device for the joint conversion of greenhouse gases by multiple plasma units introduces a heat exchange system between the cold and warm plasma units, uses high-pressure insulating oil as the heat exchange fluid, collects the heat dissipation energy inside the reactor for reuse, and ensures the insulation safety of the warm plasma.

[0007] Furthermore, in the aforementioned device for the combined conversion of greenhouse gases using multi-module plasma units, the warm plasma reforming unit comprises a warm plasma cavity formed by a metal cavity outer frame, an air inlet, a concentrated air outlet, a water-cooled jacket, a circulating heat exchange liquid outlet, a circulating heat exchange liquid inlet, an insulating layer, and a turbulence fan. The discharge generation structure consists of graphite electrodes, high-voltage electrodes, an electromagnetic coil, a coil power supply, and a plasma power supply. The metal cavity outer frame and high-voltage electrodes are made of stainless steel, and the insulating layer is made of polytetrafluoroethylene (PTFE). Both the high-voltage and low-voltage systems within the cavity are led out and connected to the outside via ceramic sleeves. The insulating layer and metal are sealed together using casting, and the metal frame and each outlet are sealed together using flanges to achieve a tight and airtight connection.

[0008] Furthermore, in the aforementioned device for the joint conversion of greenhouse gases using multi-module plasma units, the high-voltage electrode structure comprises three types: branch-shaped, inverted conical, and multi-needle-blade type, all made of stainless steel or tungsten carbide alloy. The rear end of the electrode is connected to the outside of the cavity via an insulating sleeve, and is subsequently linked to an external traction motor and the high-voltage output of the plasma power supply. When the plasma power supply outputs high voltage, a discharge channel is generated between the high-voltage electrode and the graphite electrode. The external traction motor pulls the high-voltage electrode, and an external magnetic field acts on the discharge region, stretching the plasma discharge channel region, while a turbulence fan enhances heat and mass transfer.

[0009] Furthermore, in the aforementioned multi-module plasma unit combined conversion of greenhouse gases device, a vacuum pump rapidly extracts the warm plasma reforming products, thereby removing carbon particles, alkynes, light hydrocarbons, and carbon dioxide through a bag filter, a de-alkyne tower, a light hydrocarbon removal tower, and a pressure swing adsorption unit, thereby increasing the syngas concentration.

[0010] Furthermore, the device for the combined conversion of greenhouse gases by multiple module plasma units employs either a shell-type heat exchanger or a tubular heat exchanger to achieve heat exchange between the warm plasma cavity and the cold plasma equalization sampler, and uses high-pressure insulating oil as the heat exchange fluid.

[0011] Furthermore, in the aforementioned device for the combined conversion of greenhouse gases using multi-module plasma units, the cold plasma hydrogenation unit is composed of a coaxial array of dielectric barrier discharge reactors. Each dielectric barrier discharge reactor is connected by a quartz tube, PTFE fasteners, stainless steel tubing, a straight-through ferrule, a stainless steel high-voltage inner electrode, a copper mesh outer electrode, a perfluoropolymer sealing ring, and stainless steel clamps, all connected by wires. The inner and outer electrodes are connected in parallel to the power supply and ground wire. The feed and discharge ports are connected to a flow equalizer and a bag filter, respectively.

[0012] Furthermore, in the aforementioned device for the combined conversion of greenhouse gases using multi-module plasma units, the cold plasma hydrogenation employs a catalyst supported on at least one of nickel, copper, cobalt, and magnesium.

[0013] Furthermore, in the aforementioned device for the combined conversion of greenhouse gases using multi-module plasma units, the catalyst support for cold plasma hydrogenation is at least one of nickel foam, copper foam, molecular sieve, and alumina.

[0014] Furthermore, in the aforementioned device for the combined conversion of greenhouse gases using multi-module plasma units, the cold plasma hydrogenation products undergo particulate matter capture and gas-liquid separation. The gaseous products then enter a flow equalizer for cyclic reaction, while the liquid products are separated and sealed in a small storage tank.

[0015] The beneficial effects of this invention are as follows: Reported plasma greenhouse gas conversion systems often focus only on the conversion effect under a single electrode structure or plasma discharge mode, and the reactions are relatively fixed and cannot adapt to various application scenarios. Furthermore, it is difficult to achieve a balance between conversion rate, throughput, and selectivity in a single plasma conversion unit. This invention combines the technical advantages of multiple plasma conversion unit modules. First, a warm plasma reforming unit is used to achieve high throughput and high conversion rate of reactants. Then, a cold plasma unit, which is easily coupled and coordinated with catalysts, is introduced to achieve targeted production of the target product. This achieves relatively ideal performance in terms of conversion rate, throughput, and selectivity. Addressing the problems of product complexity and heat dissipation in traditional plasma reactions, the separation and circulation unit proposed in this invention can effectively achieve product purification and heat utilization efficiency. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.

[0017] Figure 1 This is an overall structural diagram of a multi-module plasma unit combined to convert greenhouse gases according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the high-voltage electrode structure of the warm plasma reforming unit in this invention.

[0018] Figure 1 The reference numerals in the accompanying drawings are as follows: 1. Hydrogen-rich valve; 2. Carbon-rich valve; 3. Flow controller; 4. Mixing tank; 5. Stainless steel pipeline; 6. Plasma power supply; 7. High-voltage transmission line; 8. High-voltage electrode; 9. Raw material inlet of warm plasma chamber; 10. Circulation inlet of warm plasma chamber; 11. Electromagnetic coil; 12. Graphite ground electrode; 13. Insulating layer; 14. Metal cavity frame; 15. Coil power supply; 16. Wire; 17. Heat exchanger outlet of warm plasma chamber; 18. Product outlet of warm plasma chamber; 19. Turbulent fan; 20. Heat exchanger inlet of warm plasma chamber; 21. Warm plasma outlet pipeline; 22. Vacuum pump; 23. Bag filter No. 1; 24. Alkyne removal tower; 25. Light hydrocarbon removal tower; 26. Heat exchanger circulation pipeline; 27. Alkyne... 27. Hydrocarbon circulation feed line; 28. Light hydrocarbon circulation feed line; 29. ​​CO2 circulation feed line; 30. Pressure swing adsorption unit 1; 31. Sample pump; 32. Cold plasma unit feed line; 33. Equal flow sampler; 34. Plasma power supply; 35. Grounding wire; 36. Dielectric barrier discharge reactor array; 37. Heat exchanger; 38. Bag filter 2; 39. Gas-liquid separator; 40. Pressure swing adsorption unit 2; 41. Circulation feed pump; 42. CO circulation feed line; 43. Liquid transport line; 44. Liquid product storage tank; 45. Equal flow sampler heat exchanger inlet; 46. Equal flow sampler raw material inlet; 47. Equal flow sampler heat exchanger outlet; 48. Equal flow sampler raw material outlet; 55. Syngas storage tank.

[0019] Figure 2 The reference numerals in the accompanying drawings are as follows: 49. Short rod-shaped electrode, 50. Long rod-shaped electrode, 51. Inverted conical electrode, 52. Blade plate electrode, 53. Electrode connecting rod, 54. Tungsten needle electrode. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0021] Example 1 This invention provides a device for the combined conversion of greenhouse gases using multiple plasma units. The reactant gas passes through a warm plasma reforming unit, a separation and recycling unit, and a cold plasma hydrogenation unit to generate the corresponding target product. Since a single plasma unit cannot simultaneously achieve a balance between conversion rate, throughput, and product selectivity, and the product composition is complex with significant heat dissipation, multiple plasma units are combined to form a modular conversion system to achieve the desired technical performance.

[0022] like Figure 1As shown, the warm plasma reforming unit includes: The warm plasma chamber includes a warm plasma chamber raw material inlet 9, a warm plasma chamber circulation inlet 10, a metal chamber frame 14, an insulating layer 13, a warm plasma chamber heat exchange fluid outlet 17, a warm plasma chamber product outlet 18, a turbulence fan 19, a warm plasma chamber heat exchange fluid inlet 20, and a warm plasma outlet pipe 21. The warm plasma chamber raw material inlet 9, warm plasma chamber circulation inlet 10, warm plasma chamber heat exchange fluid outlet 17, warm plasma chamber heat exchange fluid inlet 20, and warm plasma outlet pipe 21 are fixedly connected to the metal chamber frame using flanges. The turbulence fan 19 is fixed by an internal support within the chamber. The insulating layer 13 is fixed to the inner wall of the metal chamber frame 14 by casting. The power supply and electrode structure includes a plasma power supply 6, a plasma power supply 34, a high-voltage transmission line 7, a high-voltage electrode 8, an electromagnetic coil 11, a graphite ground electrode 12, a coil power supply 15, and a wire 16. The plasma power supply 6 outputs a pulsed high-voltage signal, which is transmitted to the high-voltage electrode 8 via the high-voltage transmission line 7, inducing a discharge between the plasma power supply 6 and the graphite ground electrode 12. The plasma power supply 34 outputs a pulsed high-voltage signal, which is transmitted to the dielectric barrier discharge reactor array 36 via the high-voltage transmission line 7, inducing a discharge. The coil power supply 15 generates a DC voltage signal, which is transmitted to the electromagnetic coil 11 via the wire 16, generating a magnetic field that acts on the discharge region inside the cavity.

[0023] The gas supply system includes a hydrogen-rich valve 1, a carbon-rich valve 2, a flow controller 3, a mixing tank 4, and stainless steel piping 5. The hydrogen-rich valve 1, carbon-rich valve 2, flow controller 3, and mixing tank 4 are all connected via stainless steel piping 5. The plasma power supply 34 has a grounding wire 35.

[0024] To simultaneously achieve high mechanical strength and insulation requirements for the cavity, the main structure of the warm plasma reforming unit consists of a metal cavity frame 14, with an insulating layer 13 (polytetrafluoroethylene) attached to the inner layer for high-voltage protection. Openings are made at the corresponding gas paths, heat exchange jacket, and electrode inlets / outlets. The metal outlets of the gas paths and heat exchange jacket are sealed with flanges and connected to stainless steel pipelines using straight-through ferrules. The high-voltage electrode 8 and the graphite ground electrode 12 are fixed to the metal cavity frame 14 using insulating sleeves and flanges; all are detachable structures.

[0025] High voltage electrodes such as Figure 2As shown, there are three types of electrode structures: long and short branch electrode structure, inverted conical electrode structure, and blade-plate-multi-needle structure. These include a short rod electrode 49, a long rod electrode 50, an inverted conical electrode 51, a blade electrode 52, an electrode connecting rod 53, and a tungsten needle electrode 54. In the long and short branch electrode structure, the short rod electrode 49 and the long rod electrode 50 are combined via a threaded bayonet joint. This combination design ensures that the distance from the top of the electrodes in both the long and short branches to the ground electrode is consistent, guaranteeing that both electrodes can break down simultaneously under excitation, thus improving the conversion rate. The inverted conical electrode structure generates turbulent airflow through its electrode configuration, accelerating the mass and heat transfer process. The blade-plate-multi-needle structure combines blade electrode turbulence with a multi-needle array design, achieving the combined effect of generating airflow turbulence to enhance the heat and mass transfer process and increasing the discharge channels.

[0026] The upper and lower sides of the outer side of the cavity are respectively provided with a warm plasma cavity raw material inlet 9, a warm plasma cavity circulation inlet 10, a warm plasma cavity heat exchange liquid outlet 17, and a warm plasma cavity product outlet 18, which are used for transporting gas raw materials in the warm plasma cavity and replacing cavity heat.

[0027] The separation and circulation system includes a vacuum pump 22, a bag filter 23, an alkyne removal tower 24, a light hydrocarbon removal tower 25, an alkyne circulation feed pipeline 27, a light hydrocarbon circulation feed pipeline 28, a CO2 circulation feed pipeline 29, a pressure swing adsorption unit 30, a sample pump 31, and a heat exchanger 37. The separation system is connected in the following order: vacuum pump 22 → bag filter 23 → alkyne removal tower 24 → light hydrocarbon removal tower 25 → pressure swing adsorption unit 30 → sample pump 31. All units are connected by stainless steel pipelines. The alkyne circulation feed pipeline 27, light hydrocarbon circulation feed pipeline 28, and CO2 circulation feed pipeline 29 are connected to the warm plasma chamber circulation inlet 10 via flanges and straight-through fittings for the separation, purification, and circulation feeding of reforming and hydrogenation products. The warm plasma reforming products are extracted from the reforming unit by a vacuum pump, and then subjected to dust removal, alkyne removal, light hydrocarbon removal, and CO2 removal to obtain relatively pure syngas, which is then transported to the cold plasma hydrogenation unit. The removed hydrocarbons and CO2 are then recycled into the reforming chamber for further reaction, improving the feedstock utilization rate of the reforming reaction. Simultaneously, heat exchanger 37 facilitates thermal circulation between the warm plasma chamber and the cold plasma equalizer, using the residual heat generated by the warm plasma reforming to preheat the cold plasma sample gas, improving CO hydrogenation selectivity and reducing cold plasma power consumption.

[0028] The cold plasma hydrogenation unit includes a cold plasma unit feed line 32, a flow equalizer 33, a dielectric barrier discharge reactor array 36, a No. 2 bag filter 38, a gas-liquid separator 39, a No. 2 pressure swing adsorption device 40, a circulating feed pump 41, a CO circulating feed line 42, a liquid transport line 43, a liquid product storage and transport tank 44, a flow equalizer heat exchanger inlet 45, a flow equalizer raw material inlet 46, a flow equalizer heat exchanger outlet 47, a flow equalizer raw material outlet 48, and a syngas storage tank 55. The above-mentioned components are mainly connected by stainless steel pipelines in the following order: cold plasma unit feed line 32 → equal flow sampler 33 → dielectric barrier discharge reactor array 36 → No. 2 bag filter 38 → gas-liquid separator 39 → No. 2 pressure swing adsorption device 40 → liquid transport line 43 → liquid product storage tank 44. After the gas phase product is separated and purified, it is directly connected to the light hydrocarbon removal tower 25 in the manner of circulating feed pump 41, synthesis gas storage tank 55, and CO circulating feed line 42. The heat exchange liquid inlet 45 and the heat exchange liquid outlet 47 of the equal flow sampler are connected to the heat exchanger 37 through heat exchange pipes. The reforming products from the warm plasma unit are purified stepwise and then fed into the equalizer for preheating and equalization before being introduced into the dielectric barrier discharge reactor array for cold plasma hydrogenation. The products after the reaction are bag-type dust collectors and gas-liquid separators, and the liquid products are stored and transported. At the same time, the gaseous products can be purified by pressure swing adsorption, and the unreacted CO is added to the separation and recycling system to improve the overall atomic utilization and carbon fixation efficiency of the reaction.

Claims

1. A device for the combined conversion of greenhouse gases using multiple plasma modules, characterized in that: It includes a plasma power supply unit, a gas supply unit, a warm plasma reforming unit, a separation and circulation unit, and a cold plasma hydrogenation unit; the plasma power supply unit is connected to the warm plasma reforming unit and the cold plasma hydrogenation unit by high-voltage wires, and the gas supply unit is connected to the warm plasma reforming unit, the separation and circulation unit, and the cold plasma hydrogenation unit by stainless steel pipelines. The plasma power supply unit includes multiple plasma power supplies, a signal generator, and a high-voltage transmission line; the signal generator is connected to the plasma power supply and transmits the corresponding high-voltage pulse signal through the high-voltage transmission line. The gas supply unit includes an external gas source interface, a ball valve, a flow controller, a mixing tank, stainless steel pipelines, a demineralized water storage tank, and a heating and gasification pipeline. The external gas source interface is directly connected to a high-pressure steel cylinder, a small gas storage device, or a gas transmission pipeline. The ball valve controls the delivery of hydrogen-rich raw material gas and carbon-rich raw material gas to the flow controller. After being mixed in the mixing tank, the gas is introduced into the raw material inlet of the warm plasma cavity. The warm plasma reforming unit includes a metal cavity frame, a warm plasma cavity raw material inlet, a water-cooled interlayer, a high-voltage electrode, a graphite ground electrode, an insulating adhesive layer, an electromagnetic coil, a coil power supply, a turbulence fan, a warm plasma cavity product outlet, a warm plasma cavity heat exchange fluid inlet, and a warm plasma cavity heat exchange fluid outlet. The warm plasma cavity raw material inlet, warm plasma cavity product outlet, warm plasma cavity heat exchange fluid inlet, and warm plasma cavity heat exchange fluid outlet are fixedly connected to the metal cavity frame using flanges. The water-cooled interlayer is an internal structure of the metal cavity frame. The turbulence fan is fixed by an internal support within the cavity. The high-voltage electrode is fixed to the metal cavity using metal fasteners. The insulating adhesive layer is bonded to the inner wall of the metal cavity, and the graphite ground electrode is fixed to the insulating adhesive layer using screws. The electromagnetic coil is supported by a bracket, allowing the entire warm plasma cavity to pass through and be placed within the magnetic field region; The separation and circulation unit includes a material circulation section and a heat circulation section. The material circulation section includes stainless steel pipelines, a vacuum pump, a No. 1 bag filter, a deacetylation tower, a light hydrocarbon removal tower, and a No. 1 pressure swing adsorption device, which are sequentially connected to the vacuum pump, the No. 1 bag filter, the deacetylation tower, the light hydrocarbon removal tower, and the No. 1 pressure swing adsorption device via stainless steel pipelines. The heat circulation section includes a heat exchanger, heat exchange pipelines, and a heat exchange liquid. The cold plasma hydrogenation unit includes a uniform flow injector, a dielectric barrier discharge reactor array, a No. 2 bag filter, a gas-liquid separator, a No. 2 pressure swing adsorption device, and a liquid product storage and transportation tank. These components are sequentially connected to the cold plasma unit feed line, uniform flow injector, dielectric barrier discharge reactor array, No. 2 bag filter, and gas-liquid separator via stainless steel pipes and valves. The outlet of the gas-liquid separator is connected to either the No. 2 pressure swing adsorption device or the liquid product storage and transportation tank. After separation and purification, the gaseous product is connected from the outlet of the No. 2 pressure swing adsorption device to a light hydrocarbon removal tower or a synthesis gas storage tank via a circulating feed pump. The heat exchanger inlet and outlet of the uniform flow injector are connected to the heat exchanger via heat exchange pipes.

2. The apparatus for the combined conversion of greenhouse gases using a multi-module plasma unit according to claim 1, characterized in that: The plasma power supply is used to excite the generation of low-temperature plasma in the warm plasma reforming unit and the cold plasma hydrogenation unit, and is one of the following: DC power supply, high-frequency AC power supply, microsecond pulse power supply, and nanosecond pulse power supply.

3. The apparatus for the combined conversion of greenhouse gases using multiple plasma modules according to claim 1, characterized in that: After the raw materials are reacted in the warm plasma reforming unit, they produce syngas and a small amount of low-carbon hydrocarbons. The content of syngas after reforming is increased by the separation and recycling unit, and it is used as the raw material for the cold plasma hydrogenation unit. Under the synergistic environment of plasma catalysis, it reacts to produce liquid fuel, which is then stored or transported after primary purification.

4. The apparatus for the combined conversion of greenhouse gases using multiple plasma modules according to claim 1, characterized in that: Heat exchange pipes, heat exchangers, and heat exchange fluids are introduced between the warm plasma reforming unit and the cold plasma hydrogenation unit. High-pressure insulating oil is used as the heat exchange fluid to collect the internal heat dissipation energy of the discharge reaction region of the warm plasma reforming unit for reuse, while ensuring the insulation safety of the warm plasma.

5. The apparatus for the combined conversion of greenhouse gases using multiple plasma modules according to claim 1, characterized in that: The warm plasma cavity is formed by combining a metal cavity frame, a warm plasma cavity raw material inlet, a warm plasma cavity product outlet, a water-cooled jacket, a warm plasma cavity heat exchange fluid outlet, a warm plasma cavity heat exchange fluid inlet, an insulating adhesive layer, and a turbulence fan. A graphite ground electrode, a high-voltage electrode, an electromagnetic coil, a coil power supply, and a plasma power supply constitute the discharge generation structure. The metal cavity frame and the high-voltage electrode are made of stainless steel, and the insulating adhesive layer is made of polytetrafluoroethylene (PTFE). The high-voltage electrode inside the warm plasma cavity is led out of the cavity and connected to the outside via an electrode rod and a ceramic sleeve assembly. The insulating adhesive layer on the inner wall of the cavity is sealed to the inner wall of the metal cavity frame by casting. The metal cavity frame, the warm plasma cavity raw material inlet, the warm plasma cavity heat exchange fluid inlet, and the warm plasma cavity heat exchange fluid outlet are sealed together using flanges to achieve a tight and airtight connection.

6. The apparatus for the combined conversion of greenhouse gases by multiple plasma modules according to claim 1, characterized in that: The high-voltage electrodes are divided into branch type and inverted cone type, both made of stainless steel or tungsten carbide alloy. The rear end of the electrode is connected to the outside of the warm plasma cavity through an insulating sleeve. It is first connected to an external traction motor to achieve coaxial rotation of the electrode, and then connected to the high-voltage output of the plasma power supply. When the plasma power supply outputs high voltage, the discharge channel is generated between the high-voltage electrode and the graphite ground electrode. The high-voltage electrode is pulled by the external traction motor and the external magnetic field acts on the discharge area, stretching the plasma discharge channel area. The turbulence fan enhances heat and mass transfer.

7. The apparatus for the combined conversion of greenhouse gases using multiple plasma modules according to claim 1, characterized in that: A vacuum pump is used to quickly extract the warm plasma reforming products after the product outlet of the warm plasma chamber. The warm plasma reforming products are then passed sequentially through bag filter No. 1, alkyne removal tower, light hydrocarbon removal tower and pressure swing adsorption device No. 1 to remove carbon particles, alkynes and light hydrocarbons in sequence.

8. The apparatus for the combined conversion of greenhouse gases using a multi-module plasma unit according to claim 1, characterized in that: Heat exchange between the warm plasma cavity and the cold plasma hydrogenation unit is achieved using either a shell-and-shell heat exchanger or a tubular heat exchanger, with high-pressure insulating oil used as the heat exchange fluid.

9. The apparatus for the combined conversion of greenhouse gases by a multi-module plasma unit according to claim 1, characterized in that: The cold plasma hydrogenation unit adopts a coaxial dielectric barrier discharge reactor array. Each dielectric barrier discharge reactor is composed of a quartz tube, PTFE fasteners, stainless steel pipes, a straight-through ferrule, a stainless steel high-voltage inner electrode, a copper mesh outer electrode, a perfluorinated sealing ring, a stainless steel clamp, and wires. The stainless steel high-voltage inner electrode and the copper mesh outer electrode are connected in parallel and then connected to the high-voltage output terminal and the ground terminal of the power supply. The feed inlet and discharge outlet of the dielectric barrier discharge reactor array are connected to the flow equalizer and the No. 2 bag filter, respectively.

10. The apparatus for the combined conversion of greenhouse gases by a multi-module plasma unit according to claim 1, characterized in that: The catalyst used in the cold plasma hydrogenation unit is supported on at least one of nickel, copper, cobalt, and magnesium.

11. The apparatus for the combined conversion of greenhouse gases by a multi-module plasma unit according to claim 1, characterized in that: The catalyst support used in the cold plasma hydrogenation unit is at least one of nickel foam, copper foam, molecular sieve, and alumina.

12. The apparatus for the combined conversion of greenhouse gases by a multi-module plasma unit according to claim 1, characterized in that: After particulate matter capture and gas-liquid separation, the cold plasma hydrogenation products are processed by a flow equalizer for recycling and reaction, while the liquid products are stored in a liquid product storage tank.

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