An apparatus and method for cracking CO in a packed bed plasma 2 ​

Abstract

The present invention discloses a device and a method for cracking CO2 by packed bed plasma, belonging to the technical field of carbon dioxide conversion and utilization. It includes a gas-liquid input end, a conversion section, and a gas-liquid output end; the gas-liquid input end and the gas-liquid output end are respectively and hermetically connected to two ends of the conversion section; the conversion section is a coaxial multi-layer structure, and the conversion section is successively provided with an insulating high-thermal conductivity hose layer, a solid copper tube layer, a micron-hole porous sintered copper metal layer, a sub-millimeter-hole porous sintered ceramic layer, a grounded copper tube layer, an external insulating and sealing layer, and a water-cooling layer from the central axis along the radial direction; the inner surface of the grounded copper tube layer is subjected to ion sputtering treatment, and the microstructure of the inner surface of the grounded copper tube layer is in the shape of fish-scale protrusions, and the size of the protrusions is 100-500 μm; the solid copper tube layer is connected to a high-frequency power supply. The device and method for cracking CO2 by packed bed plasma of the present invention do not use a catalyst, have a simple structure, intense discharge, good conversion effect, can realize the cracking of large-flow CO2 waste gas, and are easy to scale up.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide conversion and utilization, and particularly relates to a device and method for cracking CO 2 by a packed bed plasma. Background Art

[0002] From the perspective of converting CO 2 and reducing its inventory, researchers have proposed some technical means. Dielectric barrier discharge (DBD) can generate non-thermal equilibrium plasma, which can reduce CO 2 under normal temperature and pressure conditions. It is one of the important methods for the conversion and utilization of CO 2 . Non-thermal equilibrium plasma consists of a large number of charged particles and neutral substances, and the electron energy ranges from 1 to 20 eV. Different average electron energies will lead to different CO 2 decomposition pathways, which can significantly reduce the CO 2 cracking barrier and promote the conversion of CO 2 into high-value-added chemicals. However, the conversion effect of conventional flat or coaxial cylindrical DBD conversion units is not good, and the conversion rate and energy efficiency are low.

[0003] Currently, related technologies for converting CO 2 by plasma, such as: Qin Zugeng et al. (CN202945185U) used needle-plate discharge corona to convert a CO 2 / H 2 mixed gas, and at the same time, a solid reaction bed was set at the rear of the plasma for conversion, and the conversion area was small; Zhao Wenji (CN101903089A) used multiple pairs of rod-shaped titanium dioxide electrodes to generate plasma and separated O 2 by pressure swing adsorption. The discharge volume of this structure is small, and the gas-solid interface catalytic effect is not well utilized; Yin Yongxiang et al. (CN108373156A) designed a high-temperature environment using a high-temperature CO 2 plasma jet, so that while the carbon-containing substance quickly consumes the oxygen element in the cracked gas, the carbon-containing substance reacts with the uncracked CO 2 to be converted into CO, with high energy consumption; Li Jing et al. (CN115466167A) used a low-temperature plasma reactor to cooperate with a hydrophobic CeO 2 / ZSM-5 catalyst for continuous gas-solid reaction. The catalyst preparation process is complex and there are problems such as catalyst poisoning and deactivation; Wu Angjian et al. (CN115364791A) used a low-temperature dielectric barrier discharge array plasma technology to promote the common activation of CO 2 and H 2 by an arc, but the CO 2The conversion rate is relatively low; Mei Danhua et al. (CN114733327A) adopted a barrier dielectric discharge integrated device for coupling CO 2 decomposition and hydrogenation reactions, using a two-stage plasma reaction structure, capable of preparing high-value chemical products, but the conversion effect of dielectric barrier discharge in a single region is not good.

[0004] In summary, at present, there are still problems such as low efficiency, difficult and costly research and development of catalytic materials, and small scale in the conversion treatment of CO 2 by using plasma. 2 Summary of the Invention

[0005] The purpose of the present invention is to overcome the problems in the prior art and provide a device and method for cracking CO 2 with a packed bed plasma. This device does not use a catalyst, has a simple structure, intense discharge, good conversion effect, can achieve the cracking of large-flow CO 2 waste gas, and is easy to scale up.

[0006] One of the purposes of the present invention is to provide a device for cracking CO 2 with a packed bed plasma, including a gas-liquid input end, a conversion section, and a gas-liquid output end; the gas-liquid input end and the gas-liquid output end are respectively sealed and connected to two ends of the conversion section; the conversion section is a coaxial multi-layer structure, and the conversion section is sequentially provided with an insulating high thermal conductivity hose layer, a solid copper tube layer, a micron-hole porous sintered copper metal layer, a sub-millimeter-hole porous sintered ceramic layer, a grounded copper tube layer, an external insulating seal layer, and a water cooling layer from the central axis along the radial direction;

[0007] The inner surface of the grounded copper tube layer is subjected to ion sputtering treatment, and the micro-structure of the inner surface of the grounded copper tube layer is in the shape of fish scale protrusions, and the size of the protrusions is 100-500 μm; the solid copper tube layer is connected to a high-frequency power supply, and the grounded copper tube layer is grounded.

[0008] Preferably, both the gas-liquid input end and the gas-liquid output end include a fixed insulating seal layer, a gas delivery pipe, and a liquid delivery pipe. The fixed insulating seal layer is sealed and connected to the end of the conversion section, and the inner wall of the fixed insulating seal layer is hermetically sleeved outside the solid copper tube layer. The outer surface of the fixed insulating seal layer is flush with the outer edge of the external insulating seal layer. The insulating high thermal conductivity hose layer and the solid copper tube layer penetrate the center of the fixed insulating seal layer, and the high thermal conductivity hose layer is communicated with the liquid delivery pipe. The gas delivery pipe is hermetically embedded in the fixed insulating seal layer. Insulating sealing rings are provided on the outer periphery of the inlet pipe and at the connection between the solid copper tube layer and the fixed insulating seal layer;

[0009] ​An intake one-way valve is provided on the gas delivery pipe of the gas-liquid input end, and a liquid intake one-way valve is provided on the liquid delivery pipe. An outlet one-way valve is provided on the gas delivery pipe of the gas-liquid output end, and a liquid outlet one-way valve is provided on the liquid delivery pipe. The position of the intake pipe corresponds to the position of the sub-millimeter pore porous sintered ceramic layer.

[0010] Preferably, the end of the solid copper pipe layer corresponding to the gas-liquid output end is a hemispherical structure that buckles towards the gas-liquid input end, and the buckled hemispherical structure can cover the end of the micro-pore porous sintered copper metal layer.

[0011] Preferably, the materials of the solid copper pipe layer and the micro-pore porous sintered copper metal layer are one or several of brass, red copper, or copper-containing alloys.

[0012] Preferably, the inside of the micro-pore porous sintered copper metal layer is a sponge-like porous structure, and the pore size of the porous structure is 1 - 100 μm.

[0013] Preferably, the sub-millimeter pore porous sintered ceramic layer is zirconia ceramic or alumina ceramic, and the inside is a sponge-like porous structure, and the pore size of the porous structure is 50 - 500 μm.

[0014] Preferably, the water-cooling layer is a spiral arrangement of cold water attached to the surface of the external insulating and sealing layer.

[0015] Preferably, the flow rate of the coolant flowing inside the insulating and highly heat-conductive hose layer is 100 - 1000 sccm.

[0016] Preferably, the inner diameter of the insulating and highly heat-conductive hose layer is 8 mm, the wall thickness is 1 mm, the thickness of the solid copper pipe layer is 2 mm, the diameter of the spherical end of the solid copper pipe layer corresponding to the gas-liquid output end is 10 mm, the thickness of the micro-pore porous sintered copper metal layer is 3 mm, the thickness of the sub-millimeter pore porous sintered ceramic layer is 2 - 5 mm, the thickness of the grounding copper pipe layer is 3 mm, the thickness of the external insulating and sealing layer is 1 - 2 mm, the diameter of the water-cooling pipe of the water-cooling layer is 3 mm, the inner diameter is 1 - 2 mm, the length of the fixed insulating and sealing layer is 10 mm, the aperture of the gas inlet and outlet pipe hole is 3 mm, and it is embedded 10 mm away from the symmetry axis.

[0017] The second object of the present invention is to provide the above-mentioned packed bed plasma cracking CO 2 The method for cracking CO 2 by the device is as follows: The working medium gas enters the conversion section through the gas delivery pipe, slowly and evenly flows out to the surroundings through the micro-pore porous sintered copper metal layer and the sub-millimeter pore porous sintered ceramic layer, forms micro gas columns in the voids, and together with the micro pores constitutes numerous micro-meter / sub-millimeter filamentary discharge units; The converted gas flows out through the outlet gas delivery pipe, and the coolant flowing in the insulating and highly heat-conductive hose layer and the water-cooling layer attached to the external insulating and sealing layer cool down the conversion system.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: The device and method for cracking CO by packed bed plasma provided by the present invention 2 synergistically utilize the catalytic effect of copper-based materials, the effect of micron pore electrodes in enhancing the local electric field intensity and microdischarge intensity, and the ion sputtering of the inner surface of the grounded copper pipe in a fish scale shape. The micron pore sintered metal and the ion sputtering of the inner surface of the grounded copper pipe in a fish scale shape are used for multi-stage plasma catalytic conversion treatment. Under a smaller discharge volume, the catalytic effect of the copper-based material at the gas-solid interface is fully utilized to ensure the 2 efficient conversion of CO, and improve the conversion rate and energy efficiency. The device has a simple structure, intense discharge, no poisoning inactivation effect of the electrode material, and good conversion effect.

[0019] 2. The present invention uses sub-millimeter pore sintered ceramics as the filling medium. While equalizing the flow, it enhances the microdischarge intensity and increases the number of discharges, improving the CO 2 conversion ability in the plasma region. As the filling medium, the sub-millimeter pore sintered ceramics can be directly in contact with the high-voltage electrode and the grounded electrode, omitting the insulating material layer between the conventional barrier dielectric discharge, the packed bed gas medium and the grounded electrode, which can further improve the discharge conversion energy efficiency. This discharge structure is novel and simple, and can generate a large-area plasma even at a relatively low applied voltage. Selecting a barrier material with a high relative dielectric constant and a secondary electron emission coefficient to make the sub-millimeter pore sintered ceramics as the filling medium (such as zirconia) can further enhance the local field strength and improve the conversion rate.

[0020] 3. The present invention applies high-frequency high voltage to the micron pore sintered metal to generate synchronous, stable and uniform discharges, generating abundant highly active particles in the core conversion unit, strengthening the 2 two paths of vibrational state pumping excitation and CO+2 composite decomposition in the CO plasma, reducing the energy required for conversion. The conversion system has a small back pressure and low energy consumption, and can improve the processing efficiency.

[0021] 4. The present invention uses a coolant layer and a water-cooled layer to reduce the system temperature, especially the temperature of the electrodes, to extend the service life of the system. The high field strength and long-time filamentous discharges in the micropores of the sub-millimeter pore sintered ceramics and the micron pore sintered metal will generate local high heat, damaging the microstructures on the electrode surface that play a catalytic role. Adding the coolant layer and the water-cooled layer is beneficial to protecting the microstructures on the electrode surface, extending the service life of the conversion unit, reducing the operation cost of the enterprise, and at the same time facilitating the reuse of the collected thermal energy.

[0022] 5. The present invention can work normally at normal temperature and pressure, without the need for expensive temperature control equipment; it can increase or decrease the volume of the discharge interval according to actual requirements, adjust and control the processing volume, and all components of this structure are convenient to disassemble and assemble, and convenient for maintenance. Description of the Drawings

[0023] Figure 1 Structural schematic of the present invention Figure 1 ;

[0024] Figure 2 Structural schematic of the present invention Figure 2 。

[0025] Description of reference numerals:

[0026] 1. Insulating high - thermal - conductivity hose layer, 2. Solid copper tube layer, 3. Micron - pore porous sintered copper metal layer, 4. Sub - millimeter - pore porous sintered ceramic layer, 5. Grounding copper tube layer, 6. External insulating and sealing layer, 7. Water - cooling layer, 8. Fixed insulating and sealing layer, 9. Gas delivery pipe, 10. Liquid delivery pipe, 11. Intake check valve, 12. Liquid intake check valve, 13. Insulating sealing ring, 14. Coolant. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "provided with", "sheathed / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0030] As Figure 1 shown, the present invention provides a packed - bed plasma cracking of CO 2The device includes a gas-liquid input end, a conversion section, and a gas-liquid output end; the gas-liquid input end and the gas-liquid output end are respectively hermetically connected to two ends of the conversion section; the conversion section is a coaxial multi-layer structure, and the conversion section is sequentially provided with an insulating high thermal conductivity hose layer 1, a solid copper pipe layer 2, a micron-hole porous sintered copper metal layer 3, a sub-millimeter-hole porous sintered ceramic layer 4, a grounded copper pipe layer 5, an external insulating sealing layer 6, and a water-cooling layer 7 from the central axis along the radial direction;

[0031] The inner surface of the grounded copper pipe layer 5 is subjected to ion sputtering treatment, and the microstructure of the inner surface of the grounded copper pipe layer is in the shape of fish-scale protrusions, and the size of the protrusions is 100-500 μm; the solid copper pipe layer 2 is connected to a high-frequency power supply, and the grounded copper pipe layer 5 is grounded.

[0032] Preferably, both the gas-liquid input end and the gas-liquid output end include a fixed insulating sealing layer 8, a gas delivery pipe 9, and a liquid delivery pipe 10. The fixed insulating sealing layer 8 is hermetically connected to the end of the conversion section, and the inner wall of the fixed insulating sealing layer 8 is hermetically sleeved outside the solid copper pipe layer 2. The outer surface of the fixed insulating sealing layer 8 is flush with the outer edge of the external insulating sealing layer 6. The insulating high thermal conductivity hose layer 1 and the solid copper pipe layer 2 penetrate the center of the fixed insulating sealing layer 8, and the high thermal conductivity hose layer 1 is communicated with the liquid delivery pipe 10. The gas delivery pipe 9 is hermetically embedded in the fixed insulating sealing layer 8. Insulating sealing rings 13 are provided on the outer periphery of the intake pipe 9 and at the connection between the solid copper pipe layer 2 and the fixed insulating sealing layer 8; the diameter of the fixed insulating sealing layer 8 is equal to the outer diameter of the external insulating sealing layer, the inner diameter is equal to the outer diameter of the solid copper pipe layer, the length is 10 mm, and the material is the same as that of the external insulating sealing layer.

[0033] An intake check valve 11 is provided on the gas delivery pipe 9 of the gas-liquid input end, and a liquid intake check valve 12 is provided on the liquid delivery pipe 10. An outlet check valve 11 is provided on the gas delivery pipe 9 of the gas-liquid output end, and a liquid outlet check valve 12 is provided on the liquid delivery pipe 10. The position of the intake pipe 9 corresponds to the position of the sub-millimeter-hole porous sintered ceramic layer 4.

[0034] Preferably, the end of the solid copper pipe layer 2 corresponding to the gas-liquid output end is a hemispherical structure buckled towards the gas-liquid input end, and the buckled hemispherical structure can cover the end of the micron-hole porous sintered copper metal layer 3, and the end of the solid copper pipe layer is a hemispherical body with a chamfered treatment.

[0035] Preferably, the materials of the solid copper pipe layer 2 and the micron-hole porous sintered copper metal layer 3 are one or more of brass, red copper, or copper-containing alloys.

[0036] Preferably, the inside of the micron-hole porous sintered copper metal layer 3 is a sponge-like porous structure, and the pore size of the porous structure is 1-100 μm.

[0037] Preferably, the sub-millimeter pore porous sintered ceramic layer 4 is zirconia ceramic or alumina ceramic, with a spongy porous structure inside, and the pore size of the porous structure is 50 - 500 μm.

[0038] Preferably, the water cooling layer 7 is cold water spirally arranged on the surface of the external insulation sealing layer 6.

[0039] Preferably, the flow rate of the flowing coolant in the coolant layer is 100 - 1000 sccm, which can absorb heat sufficiently, quickly reduce the temperature of the solid copper tube layer with a small amount of coolant used, and extend the service life of the conversion unit.

[0040] Preferably, the inner diameter of the insulating high thermal conductivity hose layer 1 is 8 mm, the wall thickness is 1 mm, the thickness of the solid copper tube layer 2 is 2 mm, the diameter of the sphere at the end of the solid copper tube layer 2 corresponding to the gas-liquid output end is 10 mm, the thickness of the micro-pore porous sintered copper metal layer 3 is 3 mm, the thickness of the sub-millimeter pore porous sintered ceramic layer 4 is 2 - 5 mm, the thickness of the grounding copper tube layer 5 is 3 mm, the thickness of the external insulation sealing layer 6 is 1 - 2 mm, the diameter of the water cooling tube of the water cooling layer 7 is 3 mm, the inner diameter is 1 - 2 mm, the length of the fixed insulation sealing layer is 10 mm, the pore diameter of the gas inlet and outlet tube hole is 3 mm, and it is embedded 10 mm away from the symmetry axis. The single conversion unit in this embodiment is miniaturized, which is convenient for series and parallel connection for industrial scale-up; it can ensure sufficient contact between gas and sintered metal and rapid conversion; and it can ensure that the discharge mode is always in the state with the best conversion effect.

[0041] The above-mentioned packed bed plasma cracking CO 2 device for cracking CO 2 The method is as follows: The working medium gas enters the conversion section through the gas delivery pipe 9, slowly and evenly flows out to the surroundings through the micro-pore porous sintered copper metal layer 3 and the sub-millimeter pore porous sintered ceramic layer 4, forms micro gas columns in the voids, and together with the micro pores constitutes numerous micro / sub-millimeter filamentary discharge units; the converted gas flows out through the gas outlet delivery pipe 9, and the coolant flowing in the insulating high thermal conductivity hose layer 1 and the water cooling layer 7 attached to the external insulation sealing layer 6 cool down the conversion system.

[0042] Among them, the material of the insulating high thermal conductivity hose layer 1 is one or several of high thermal conductivity inorganic filler polyethylene composite material, high thermal conductivity inorganic filler phenolic resin composite material, high thermal conductivity silica gel material, high thermal conductivity adhesive material or high thermal conductivity glass fiber material.

[0043] The liquid injected into the insulating high thermal conductivity hose layer 1 is coolant, and the coolant is one or several of water, deionized water, alcohol-based coolant, glycerol-based coolant or ethylene glycol-based coolant.

[0044] The fixed insulating and sealing layer 8 and the external insulating and sealing layer 6 are made of zirconia ceramics or quartz glass. The water-cooling tube has a diameter of 3 mm and an inner diameter of 1 - 2 mm. The solid copper tube layer 2 is made of one or more of brass, pure copper, or copper-containing alloys.

[0045] In this embodiment, the conversion section of the device for the plasma cracking of CO 2 serves as the plasma generation section;

[0046] In this conversion section, the discharge gas atmosphere for plasma generation is CO 2 、CO 2 / N 2 CO 2 / Ar mixed gas or CO 2 / Ar mixed gas. The gas mixing ratio is adjustable, the conversion pressure is 0.1 kPa - 200 kPa, and the conversion temperature is room temperature;

[0047] Among them, in the conversion section, the solid copper tube layer is connected to a high-frequency voltage, and the high-frequency voltage is a kHz AC source (frequency 1 - 80 kHz), a repetitive microsecond pulse source (frequency 1 - 100 kHz), or a kHz modulated voltage, and the voltage amplitude is at the kV level;

[0048] Among them, the micron-hole porous sintered copper metal layer 3 serves both as a conductive metal and as a flow equalizing device, and can also enhance the microdischarge in the system pores and increase the gas-solid interface surface area, enhancing the catalytic conversion effect; the inside of the micron-hole porous sintered copper metal layer 3 is a spongy porous structure with uniform pore distribution, the pore size is 1 - 100 μm, and the pores can pass gas molecules;

[0049] Among them, the sub-millimeter-hole porous sintered ceramic layer 4 is made of a material with a high relative dielectric constant and a high secondary electron emission coefficient, serves both as a packed bed medium and as a flow equalizing device, and can also increase the discharge plasma volume, the number of microdischarges, and enhance the microdischarge intensity, enhancing the conversion effect; the inside of the sub-millimeter-hole porous sintered ceramic layer 4 is a spongy porous structure with uniform pore distribution, the pore size is 50 - 500 μm, and the pores can pass gas molecules;

[0050] Among them, the grounded copper tube layer 5 serves both as a grounded conductive metal and as a catalytic device. The inner surface of the grounded copper tube layer is subjected to ion sputtering treatment, and the inner surface microstructure shows fish-scale-like protrusions with a protrusion size of about 100 - 500 μm; enabling CO 2 vibrational states and CO+2 to be converted into CO and O 2 more effectively;

[0051] Among them, the external insulating and sealing layer 10 is provided with an opening with a diameter of 2 - 3 mm for leading out the conductive metal of the grounded copper tube layer 5 and grounding it;

[0052] The working fluid gas enters the conversion section through the gas delivery pipe 9 embedded in the fixed insulation sealing layer 8 in the intake air and liquid insulation sealing module, and slowly and evenly flows out to the surroundings through the micron-hole porous sintered copper metal layer 3 and the sub-millimeter-hole porous sintered ceramic layer 4, forming micro gas columns in the voids, which together with the micro holes constitute numerous micron / sub-millimeter filamentary discharge units. The micro holes are irregular in shape and have many electric field concentration points, and the local electric field strength can reach 105-106 V / m, which is conducive to the formation of large-area high-power discharge corona and discharge filaments. The inner surface of the grounded copper pipe layer 5 is subjected to ion sputtering treatment, and the inner surface microstructure is in the form of fish-scale protrusions, which can further enhance the discharge intensity. At the same time, the copper-based material has a certain catalytic effect on the decomposition of CO 2 to generate CO and O 2 and has a certain catalytic effect. The fish-scale-like microscopic structure on the surface is conducive to increasing the gas-solid interface area, expanding the catalytic area, and enhancing the catalytic effect. The solid copper pipe layer 2 and the micron-hole porous sintered copper metal layer 3 as a whole serve as the high-voltage electrode, and together with the sub-millimeter-hole porous sintered ceramic layer 4 and the grounded copper pipe layer 5, they constitute a packed bed enhanced dielectric barrier discharge plasma device, with stable discharge and easy control. The converted gas flows out through the gas delivery pipe 9 embedded in the fixed insulation sealing layer 8 in the outlet air and liquid insulation sealing module. The coolant flowing in the insulating high thermal conductivity hose layer 1 and the water-cooled layer 7 attached to the external insulation sealing layer 6 cool the conversion system and extend the service life of the device.

[0053] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An apparatus for pyrolyzing CO in a packed bed plasma 2 device It is characterized in that it includes a gas-liquid input end, a conversion section, and a gas-liquid output end; the gas-liquid input end and the gas-liquid output end are respectively and hermetically connected to two ends of the conversion section; the conversion section is a coaxial multi-layer structure, and the conversion section is successively provided with an insulating high thermal conductivity hose layer (1), a solid copper pipe layer (2), a micron-hole porous sintered copper metal layer (3), a sub-millimeter-hole porous sintered ceramic layer (4), a grounded copper pipe layer (5), an external insulating seal layer (6), and a water-cooling layer (7) from the central axis along the radial direction; the inner surface of the grounded copper pipe layer (5) is subjected to ion sputtering treatment, and the microstructure of the inner surface of the grounded copper pipe layer is in the shape of fish-scale protrusions, and the size of the protrusions is 100-500 μm; the solid copper pipe layer (2) is connected to a high-frequency power supply, and the grounded copper pipe layer (5) is grounded; both the gas-liquid input end and the gas-liquid output end include a fixed insulating seal layer (8), a gas delivery pipe (9), and a liquid delivery pipe (10). The fixed insulating seal layer (8) is hermetically connected to the end of the conversion section, and the inner wall of the fixed insulating seal layer (8) is hermetically sleeved outside the solid copper pipe layer (2). The outer surface of the fixed insulating seal layer (8) is flush with the outer edge of the external insulating seal layer (6). The insulating high thermal conductivity hose layer (1) and the solid copper pipe layer (2) penetrate through the center of the fixed insulating seal layer (8), and the high thermal conductivity hose layer (1) is communicated with the liquid delivery pipe (10). The gas delivery pipe (9) is hermetically embedded in the fixed insulating seal layer (8), and insulating sealing rings (13) are provided on the outer circumference of the gas delivery pipe (9) and at the connection between the solid copper pipe layer (2) and the fixed insulating seal layer (8); an intake check valve (11) is provided on the gas delivery pipe (9) of the gas-liquid input end, and a liquid intake check valve (12) is provided on the liquid delivery pipe (10). An outlet check valve is provided on the gas delivery pipe (9) of the gas-liquid output end, and a liquid outlet check valve is provided on the liquid delivery pipe (10). The position of the intake pipe (9) corresponds to the position of the sub-millimeter-hole porous sintered ceramic layer (4).

2. The apparatus for pyrolyzing CO in a packed bed plasma as described in claim 1 2 and It is characterized in that the end of the solid copper pipe layer (2) corresponding to the gas-liquid output end is a hemispherical structure buckled towards the gas-liquid input end, and the buckled hemispherical structure can cover the end of the micron-hole porous sintered copper metal layer (3).

3. The apparatus for cracking CO in a packed bed plasma as claimed in claim 1 2 and It is characterized in that the materials of the solid copper pipe layer (2) and the micron-hole porous sintered copper metal layer (3) are one or several of brass, red copper, or copper-containing alloys.

4. The apparatus for cracking CO in a packed bed plasma as claimed in claim 1 2 wherein It is characterized in that the inside of the micron-hole porous sintered copper metal layer (3) is a sponge-like porous structure, and the pore size of the porous structure is 1-100 μm.

5. The apparatus for cracking CO in a packed bed plasma as claimed in claim 1 2 and It is characterized in that the sub-millimeter-hole porous sintered ceramic layer (4) is zirconia ceramic or alumina ceramic, and the inside is a sponge-like porous structure, and the pore size of the porous structure is 50-500 μm.

6. The apparatus for cracking CO in a packed bed plasma as claimed in claim 1 2 and It is characterized in that the water-cooling layer (7) is a cold water pipe spirally arranged on the surface of the external insulating seal layer (6).

7. The apparatus for cracking CO in a packed bed plasma as described in claim 1 2 and It is characterized in that the flow rate of the coolant flowing inside the insulating high thermal conductivity hose layer (1) is 100-1000 sccm.

8. The apparatus for pyrolyzing CO in a packed bed plasma as claimed in claim 1 2 and It is characterized in that The inner diameter of the insulating high thermal conductivity hose layer (1) is 8 mm, the wall thickness is 1 mm, the solid copper pipe layer (2) is 2 mm thick, the diameter of the sphere at the end of the solid copper pipe layer (2) corresponding to the gas-liquid output end is 10 mm, the micron pore porous sintered copper metal layer (3) has a thickness of 3 mm, the sub-millimeter pore porous sintered ceramic layer (4) has a thickness of 2 - 5 mm, the grounding copper pipe layer (5) has a thickness of 3 mm, the external insulating seal layer (6) has a thickness of 1 - 2 mm, the water cooling pipes of the water cooling layer (7) have a diameter of 3 mm and an inner diameter of 1 - 2 mm, the length of the fixed insulating seal layer is 10 mm, the aperture of the gas inlet and outlet pipe hole is 3 mm, and it is embedded 10 mm away from the symmetry axis.

9. Using the apparatus for cracking CO as described in claim 1 to crack CO 2 and the method for cracking CO 2 as claimed It is characterized in that The working medium gas enters the conversion section through the gas delivery pipe at the gas-liquid input end, slowly and evenly flows out to the surroundings through the micron pore porous sintered copper metal layer (3) and the sub-millimeter pore porous sintered ceramic layer (4), forms micro gas columns in the voids, and together with the micropores constitutes numerous micron / sub-millimeter filamentary discharge units; the converted gas flows out through the gas delivery pipe at the gas-liquid output end, and the coolant flowing in the insulating high thermal conductivity hose layer (1) and the water cooling layer (7) attached to the external insulating seal layer (6) cool the conversion section.

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