Plasma reactor array and device for photothermally driving plasma reactor array comprising same

Abstract

The invention relates to a plasma reactor array and a device comprising the same for photo-thermally driving the plasma reactor array, the plasma reactor array comprises n basic units stacked and arranged in a honeycomb shape, and n is greater than or equal to 2; the basic unit comprises six dielectric barrier discharge plasma reactors which are arranged in a hexagonal structure; by designing the structure of the plasma reactor array and cooperating with a photo-thermal driving mode, the CO2 treatment efficiency is improved, the conversion rate of CO2 is preferably improved to 54.0% or above, and meanwhile, the selectivity of CO is preferably improved to 98.0% or above; the problems that when an existing device is used for preparing CO by driving CO2 through a low-temperature plasma technology, the coupling performance with renewable energy sources is poor, the flow of single equipment is small, and consequently the treatment efficiency is low are solved, and the device has wide application prospects.

Description

Technical Field

[0001] This invention relates to the fields of CO2 conversion and renewable energy technology, and more particularly to a plasma reactor array and an apparatus including the photothermal driven plasma reactor array thereof, especially to a dielectric barrier discharge plasma reactor array for CO2 conversion and an apparatus including the photothermal driven dielectric barrier discharge plasma reactor array thereof. Background Technology

[0002] In carbon capture, utilization, and storage (CCUS) technology, the conversion of CO2 to CO is particularly important. This is because CO2 is an inert molecule, and the synthesis of various chemicals requires significant energy to break the two carbon-oxygen double bonds. CO, on the other hand, has only one triple bond with lower bond energy, making it easier to synthesize C1 chemicals. Therefore, CO serves as a medium linking CO2 and high-value-added chemicals, and the efficient and clean conversion of CO2 to CO has become a key focus.

[0003] Traditional industrial CO2-to-CO conversion typically utilizes a reverse water-gas shift reaction involving the combustion of fossil fuels. This reaction requires a high-temperature, atmospheric-pressure catalytic environment, often relying on the combustion of natural gas or coal for heat, resulting in additional carbon emissions and failing to achieve both high efficiency and cleanliness. Currently, the use of low-temperature plasma technology for CO2-to-CO conversion is advocated. This process is electrically driven, requiring no additional heat source. Its unique advantage lies in utilizing high-energy electrons to non-equilibrium activate CO2 molecules, allowing the reaction to occur under mild conditions close to room temperature, thus theoretically avoiding indirect carbon emissions from high-temperature heat sources. However, despite robust laboratory research demonstrating its technical feasibility, this technology remains largely confined to academic papers and proof-of-concept stages. Energy consumption and efficiency were not considered in the technical design, hindering industrial-scale implementation.

[0004] The current low-temperature plasma technology for driving CO2 to produce CO generally faces the following technical challenges: (1) High-quality power dependence is strong and poor coupling with renewable energy. Existing technical solutions lack effective power smoothing and energy buffering mechanisms, which can easily lead to unstable plasma discharge and serious deterioration of conversion efficiency; (2) Due to the physical mechanism of dielectric barrier discharge, laboratory-scale plasma reactors are mostly microreactors or small tubular reactors. Their gas handling capacity is extremely low. Simply geometrically enlarging the reactor size can lead to uneven discharge, formation of local hot spots, and a sharp drop in energy efficiency. How to achieve a large-scale increase in gas flux is a difficult problem to achieve industrialization.

[0005] Therefore, there is an urgent need in this field for novel dielectric barrier discharge plasma arrays and their driving devices to solve problems such as poor coupling with renewable energy and low flow rate of individual devices in CO2-to-CO systems driven by low-temperature plasma technology. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a plasma reactor array and a device for a photothermal driven plasma reactor array including the same, which solves the problems of poor coupling with renewable energy and low processing efficiency due to small flow rate of individual devices when using low-temperature plasma technology to drive CO2 to produce CO.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a plasma reactor array comprising n basic units arranged in a honeycomb pattern, wherein n≥2 (e.g., 2, 3, 4, 5, 6, 7, 8, 9 or 10, etc.).

[0009] The basic unit comprises six dielectric barrier discharge plasma reactors arranged in a hexagonal structure.

[0010] The plasma reactor array of this invention uses six hexagonal dielectric barrier discharge plasma reactors as basic units, and designs n of these basic units to be stacked in a honeycomb pattern. It has the following advantages:

[0011] (1) High space utilization: The hexagonal arrangement can fill the space more tightly and cover a larger area than the conventional rectangular arrangement. Within the same area, the honeycomb stack can accommodate more basic plasma reactor units, increasing the processing efficiency.

[0012] (2) Good discharge uniformity: The honeycomb stacking arrangement can make the distance between each basic unit uniform, the discharge field distribution more uniform, and the influence of each basic unit on the surrounding units is relatively symmetrical, which is conducive to maintaining the consistency of plasma density and temperature and reducing the problem of uneven discharge or local hot spots.

[0013] (3) Reduce electromagnetic interference: Due to the geometric symmetry of the honeycomb stacking arrangement, the electric field and magnetic field between the basic units of each plasma reactor are balanced, which can effectively reduce electromagnetic interference during the discharge process. Especially when working at high frequency, reducing electromagnetic interference is very important.

[0014] (4) Modular design: The honeycomb stacking arrangement is easy to expand and is suitable for modular design. Each basic unit can be used as an independent module, which is convenient for maintenance and replacement. At the same time, the array size can be expanded or reduced according to needs.

[0015] Preferably, the basic unit comprises six dielectric barrier discharge plasma reactors arranged in a regular hexagonal structure.

[0016] Preferably, the vertical distance between the axes of any two adjacent dielectric barrier discharge plasma reactors in the plasma reactor array is 100~110 mm, for example, it can be 100 mm, 101 mm, 102 mm, 103 mm, 104 mm, 105 mm, 106 mm, 107 mm, 108 mm, 109 mm, or 110 mm, etc.

[0017] Preferably, each of the basic units is provided with an intake manifold and an exhaust manifold.

[0018] Preferably, the dielectric barrier discharge plasma reactor comprises a composite tubular structure.

[0019] Preferably, the dielectric barrier discharge plasma reactor includes an outer electrode, an inner electrode, and a barrier dielectric layer.

[0020] Preferably, the external electrode includes a ring-shaped structure with a mesh.

[0021] Preferably, the external electrode comprises a stainless steel mesh.

[0022] Preferably, the external electrode is provided with an insulating protective layer.

[0023] Preferably, the internal electrode comprises a metal cylindrical structure with a threaded structure.

[0024] Compared to conventional cylindrical internal electrodes, the present invention further preferably includes a metal cylindrical structure with a threaded structure, which can further form a tip discharge on the basis of filamentary discharge, thereby strengthening the electric field strength and promoting CO2 conversion.

[0025] Preferably, the inner electrode is disposed inside the outer electrode.

[0026] Preferably, the material of the internal electrode includes tungsten steel.

[0027] Preferably, the inner electrode is provided with an insulating protective layer.

[0028] It is worth noting that the inner electrode is only exposed at its end, and its connection method is as follows: a screw-in insulating protective layer is provided on the end support base, and a cable introduction hole is opened on the upper part of the insulating protective layer for connecting the cable and the inner electrode. The insulating protective layer does not contact the inner electrode.

[0029] Preferably, the outer electrode is grounded, and the inner electrode is connected to an AC power source via a cable.

[0030] Preferably, the barrier medium layer comprises a ring-shaped structure.

[0031] Preferably, the material of the barrier medium layer includes quartz glass.

[0032] Preferably, the barrier dielectric layer forms the inner wall of the outer electrode.

[0033] Preferably, the dielectric barrier discharge plasma reactor further includes a discharge zone, an inlet manifold, and an outlet manifold.

[0034] Preferably, the discharge region includes an annular cavity region between the region where the inner electrode is provided with a threaded structure and the region of the opposing barrier dielectric layer.

[0035] Preferably, the length of the discharge region accounts for 25-50% of the length of the inner electrode, for example, it can be 25%, 30%, 35%, 40%, 45% or 50%, etc.

[0036] Preferably, the thickness of the barrier medium layer is 2.5~3.5mm, for example, it can be 2.5mm, 2.7mm, 3mm, 3.2mm or 3.5mm, etc.

[0037] Preferably, the thickness of the cavity region is 1.3~1.7mm, for example, it can be 1.3mm, 1.4mm, 1.5mm, 1.6mm or 1.7mm.

[0038] It is worth noting that the discharge effect and conversion performance are optimal when the thickness of the barrier dielectric layer is 3 mm and the thickness of the cavity region is 1.5 mm.

[0039] Preferably, with the axis of the discharge zone as the center line, the intake manifold and the exhaust manifold are symmetrically arranged on the outer wall of the barrier medium layer and communicate with the discharge zone.

[0040] Preferably, the inlet manifold of each dielectric barrier discharge plasma reactor in each basic unit is connected to the main inlet pipe of the corresponding basic unit.

[0041] Preferably, the exhaust manifold of each dielectric barrier discharge plasma reactor in each basic unit is connected to the exhaust main of the corresponding basic unit.

[0042] Preferably, the discharge zone is equipped with a temperature monitoring component.

[0043] Preferably, the temperature monitoring component includes a thermocouple.

[0044] Preferably, a support member is provided at the end of the dielectric barrier discharge plasma reactor.

[0045] Preferably, the support includes a first flange seat and a second flange seat.

[0046] In a second aspect, the present invention provides an apparatus for a photothermal driven plasma reactor array, the apparatus comprising a photothermal power generation unit, a control unit, and the plasma reactor array described in the first aspect, connected in sequence.

[0047] The present invention provides a photothermal-driven plasma reactor array device that couples the photothermal power generation unit, the control unit, and the plasma reactor array described in the first aspect. The photothermal power generation unit converts the thermal energy concentrated by light into electrical energy and transmits the electrical energy to drive the plasma reactor array. The control unit is used to control the flow rate of the raw material gas into the plasma reaction gas and controls the electrical energy transmitted by the photothermal power generation unit to be distributed to the plasma reactor array as needed. The device achieves stable operation of the plasma reactor array through photothermal drive, thereby improving the stability of CO2 conversion performance.

[0048] Preferably, the solar thermal power generation unit includes a solar thermal unit and a power generation unit connected together.

[0049] Preferably, the photothermal unit is used to convert light into heat energy and transmit it to the power generation unit.

[0050] Preferably, the photothermal unit includes a concentrating component, a heat collecting component, a heat storage component, and a heat exchange component connected in sequence.

[0051] In this invention, the photothermal unit concentrates sunlight through the light-concentrating component, which then absorbs the sunlight and converts it into heat energy, which is then transported to the heat storage component. The heat storage component then transports the heat energy to the heat exchange component in response to demand.

[0052] Preferably, the focusing component includes a fluorescent focusing component.

[0053] Preferably, the fluorescent focusing component includes a substrate and a fluorescent layer disposed on the surface of the substrate.

[0054] Preferably, the substrate is a transparent substrate.

[0055] Preferably, the refractive index of the transparent substrate is 1.4 to 1.6%, for example, it can be 1.4%, 1.5% or 1.6%.

[0056] Preferably, the transparent substrate comprises plexiglass.

[0057] Preferably, the fluorescent focusing component further includes a protective layer disposed on the surface of the fluorescent layer.

[0058] Preferably, the fluorescent material of the fluorescent layer comprises cadmium sulfide / cadmium selenide quantum dots.

[0059] Preferably, the protective material of the protective layer includes silicon dioxide and titanium dioxide.

[0060] Preferably, the heat storage component includes a first molten salt storage component and a second molten salt storage component.

[0061] Preferably, the heat collection component, the first molten salt storage component, the heat exchange component, and the second molten salt storage component are connected in a loop.

[0062] In this invention, the first molten salt storage component and the second molten salt storage component are provided with circulating molten salt for exchanging heat. The first molten salt storage component is used to store low-temperature molten salt. After absorbing the heat energy of the heat collection component, the low-temperature molten salt is transformed into high-temperature molten salt and enters the second molten salt storage component. The second molten salt storage component is used to store high-temperature molten salt for releasing heat energy when needed, and then transforms into low-temperature molten salt and enters the second molten salt storage component.

[0063] Preferably, the outer wall of the first molten salt storage component is provided with M layers of first insulation layer, wherein M≥2, for example, it can be 2, 3, 4, 5, 6, 7 or 8, etc.

[0064] Preferably, the inner wall of the first molten salt storage component is provided with a first corrosion-resistant coating.

[0065] Preferably, the outer wall of the second molten salt storage component is provided with N layers of second insulation layer, wherein N≥2, for example, it can be 2, 3, 4, 5, 6, 7 or 8, etc.

[0066] Preferably, the inner wall of the second molten salt storage component is provided with a second corrosion-resistant coating.

[0067] In this invention, it is further preferred that the outer wall of the first molten salt storage component is provided with M layers of first insulation layer, where M≥2, or the outer wall of the second molten salt storage component is provided with N layers of second insulation layer, where N≥2, in order to form gradient insulation and gradually reduce the conduction of heat to the outside.

[0068] In this invention, it is further preferred that the inner wall of the first molten salt storage component is provided with a first corrosion-resistant coating, or the inner wall of the second molten salt storage component is provided with a second corrosion-resistant coating, in order to prevent the molten salt from corroding the corresponding storage component.

[0069] Preferably, the heat exchange component includes a housing and a heat exchange tube disposed inside the housing.

[0070] It is worth noting that in the heat exchange component, molten salt flows through the heat exchange tube, and the working fluid (water / steam) flows through the area between the outer shell and the heat exchange tube.

[0071] Preferably, the power generation unit is used to convert the thermal energy transmitted by the solar thermal unit into electrical energy and to transmit the electrical energy to the control unit.

[0072] Preferably, the discharge unit includes a steam turbine, a power generation component, and a transformer component.

[0073] In this invention, the steam turbine in the heat release unit is a single-stage steam turbine. Molten salt heats the working fluid (water) through a heat exchanger to generate high-temperature and high-pressure steam. The steam enters the steam turbine to expand and do work, and then is cooled back to the liquid state through a condenser. The power generation component and the transformer component are selected as a synchronous generator and a double-winding transformer.

[0074] Preferably, the control unit includes a power control unit and a gas control unit.

[0075] Preferably, the power control unit is used to receive electrical energy transmitted by the power generation unit and drive the plasma reactor array.

[0076] Preferably, the gas control unit is used to deliver raw material gas to the main inlet pipe of the plasma reactor array.

[0077] Preferably, the power control unit includes a power input module, an energy storage module, and a plasma power supply module.

[0078] Preferably, the power input module is used to receive the alternating current output by the solar thermal power generation unit, convert the alternating current into direct current and then send it to the energy storage module for buffering, and then the plasma power supply module converts the direct current into alternating current and sends it to the plasma reactor array.

[0079] The present invention further preferably includes an energy storage module in the power control unit. The energy storage module uses an electrochemical capacitor as the core component, which plays a role in peak shaving and valley filling. Specifically, when cloud cover causes a sudden drop in the solar thermal input power, the energy storage module can release the stored electrical energy instantly to make up for the power gap and prevent the plasma from extinguishing or becoming unstable due to insufficient power. When the light intensity recovers or becomes too strong, causing a sudden surge in the input power, the energy storage module can quickly absorb the excess electrical energy to avoid overvoltage and overcurrent impacting the subsequent plasma power supply and reactor electrodes.

[0080] In addition, the low-temperature plasma discharge process is fluctuating, and the power of each transient discharge is different. The energy storage module can achieve dynamic compensation mechanism through real-time charging and discharging. By utilizing the extremely high power density and millisecond-level response speed of the electrochemical capacitor, the transient power fluctuations can be smoothed and compensated in real time, so as to maintain the plasma discharge at a relatively stable level and ensure the stability of its CO2 conversion performance.

[0081] Preferably, the plasma power supply module is provided with n plasma power supplies, n≥2, for example, 2, 3, 4, 5, 6, 7, 8, 9 or 10, etc.

[0082] Preferably, the power control unit further includes a cooling module and a human-machine interface module.

[0083] The cooling module is designed to prevent the power input module from generating excessive heat during high-power operation, and to effectively remove the heat generated during equipment operation by using an air-cooling system.

[0084] Preferably, any two of the power input module, energy storage module, and human-machine control module are each independently provided with an electromagnetic shielding layer.

[0085] In this invention, it is further preferred that an electromagnetic shielding layer is independently provided between any two modules in the power input module, energy storage module and human-machine control module, which can prevent the plasma array from interfering with the power control unit.

[0086] The present invention further preferably incorporates filters into key circuits to reduce the impact of electromagnetic interference on the internal and external environment of the system.

[0087] Preferably, the gas control unit includes a gas supply module, a flow control module, and a gas mixing module.

[0088] Preferably, the flow control module includes a flow control component and a flow sensing component.

[0089] It is worth noting that in this invention, the raw material gas enters from the gas supply module through a pressure reducing valve, flows into the gas mixing module according to the set mixing ratio, and after uniform mixing, flows through the flow control module (MFC) according to the plasma reactor array. The MFC precisely adjusts the gas flow rate, while the flow sensor monitors the real-time flow rate and provides feedback.

[0090] Preferably, the device further includes a gas storage unit.

[0091] Preferably, the gas storage unit is connected to the main gas outlet pipe of the plasma reactor array and is used to store the product gas processed by the plasma reactor array.

[0092] Compared with the prior art, the present invention has at least the following beneficial effects:

[0093] (1) The plasma reactor array provided by the present invention is designed with 6 dielectric barrier discharge plasma reactors arranged in a regular hexagonal structure and n basic units arranged in a honeycomb stack. The two work together to significantly improve the CO2 treatment efficiency. The CO2 conversion rate is preferably increased to more than 54.0%, while the CO selectivity is preferably increased to more than 98.0%. At the same time, it also solves the problems that the current low temperature plasma technology is difficult to match with renewable energy and the low flow rate of the low temperature plasma reactor is difficult to meet the large flow rate requirements.

[0094] (2) The photothermal driven plasma reactor array device provided by the present invention drives the plasma reactor array to work by photothermal drive. Compared with traditional catalytic methods such as thermal catalysis, the reaction conditions are milder and cleaner and more environmentally friendly. In addition, the photothermal drive converts part of the heat energy collected at the front end into electrical energy to drive the plasma reactor array to work, and another part of the heat energy is directly stored to meet the requirement of keeping the temperature of the different plasma reactors constant. Attached Figure Description

[0095] Figure 1 This is a schematic diagram of the plasma reactor array provided in Embodiment 1 of the present invention, where M represents the basic unit.

[0096] Figure 2 This is a schematic diagram of the basic unit in the plasma reactor array provided in Embodiment 1 of the present invention; N in the figure represents the dielectric barrier discharge plasma reactor.

[0097] Figure 3 This is a schematic diagram of the structure of a single dielectric barrier discharge plasma reactor in the plasma reactor array provided in Embodiment 1 of the present invention.

[0098] Figure 4 This is a schematic diagram of the structure and connection relationship of the photothermal driven plasma reactor array provided in Embodiment 1 of the present invention.

[0099] In the diagram: a, inner electrode; b, first flange seat; c, intake manifold; d, discharge area; e, outer electrode; f, barrier dielectric layer; g, exhaust manifold; h, second flange seat; 1, solar thermal power generation unit; 11, concentrating component; 12, heat collection component; 13, heat storage component; 131, first molten salt storage component; 132, second molten salt storage component; 14, heat exchange component; 15, steam turbine; 16, power generation component; 17, transformer component; 2, control unit; 21, power control unit; 22, gas control unit; 3, plasma reactor array; 4, gas storage unit. Detailed Implementation

[0100] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, the following examples are merely simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention is determined by the claims.

[0101] In the following embodiments or comparative examples, the molten salt in the first molten salt storage component is 60 wt% sodium nitrate and 40 wt% potassium nitrate, and the molten salt in the second molten salt storage component is 60 wt% sodium nitrate and 40 wt% potassium nitrate.

[0102] I. Implementation Examples

[0103] Example 1

[0104] This embodiment provides a plasma reactor array 3, such as Figures 1 to 3 As shown, the plasma reactor array 3 includes 7 basic units M arranged in a honeycomb stack. Each basic unit M includes 6 dielectric barrier discharge plasma reactors N arranged in a regular hexagonal structure. Each basic unit is provided with an inlet manifold and an outlet manifold. The vertical distance between the axes of any two adjacent dielectric barrier discharge plasma reactors in the plasma reactor array 3 is 100 mm.

[0105] The dielectric barrier discharge plasma reactor N includes a composite tubular structure; the dielectric barrier discharge plasma reactor N includes an outer electrode e, an inner electrode a, a barrier dielectric layer f, a discharge zone d, an inlet manifold c, and an outlet manifold g; the end of the dielectric barrier discharge plasma reactor N is provided with a support member, the support member including a first flange seat b and a second flange seat h;

[0106] The outer electrode e includes a ring-shaped structure (stainless steel mesh) with a grid, and an insulating protective layer (made of quartz glass) is provided on the outer electrode e. The inner electrode a includes a metal cylindrical structure with a threaded structure, and is located inside the outer electrode e. The inner electrode a is made of tungsten carbide and has an insulating protective layer (made of polytetrafluoroethylene). The outer electrode e is grounded, and the inner electrode a is connected to an AC power source via a cable. The blocking dielectric layer f includes a ring-shaped structure, and the blocking dielectric layer f is made of quartz glass. The inner wall of the outer electrode e is provided by the dielectric layer f. The discharge region d includes an annular cavity region between the region where the inner electrode a has a threaded structure and the region of the opposing barrier dielectric layer f. The length of the discharge region d is 35% of the length of the inner electrode a. The thickness of the barrier dielectric layer f is 3 mm. The thickness of the cavity region is 1.5 mm. With the axis of the discharge region d as the center line, the intake manifold c and the exhaust manifold g are symmetrically arranged on the outer wall of the barrier dielectric layer f and communicate with the discharge region d. The discharge region d is provided with a temperature monitoring component (thermocouple).

[0107] The inlet manifold c of each dielectric barrier discharge plasma reactor N in each basic unit M is connected to the main inlet pipe of the corresponding basic unit; the outlet manifold g of each dielectric barrier discharge plasma reactor N in each basic unit M is connected to the main outlet pipe of the corresponding basic unit.

[0108] This embodiment also provides a device for a photothermal driven plasma reactor array 3, such as... Figure 4 As shown, the device includes a solar thermal power generation unit 1, a control unit 2, a plasma reactor array 3 as described in this embodiment, and a gas storage unit 4 connected in sequence.

[0109] The solar thermal power generation unit 1 includes a solar thermal unit and a power generation unit connected together. The solar thermal unit is used to convert light into heat energy and transfer it to the power generation unit. The solar thermal unit includes a concentrating component 11 (fluorescent concentrator), a heat collection component 12 (heat collector), a heat storage component 13 (heat accumulator), and a heat exchange component 14 (heat exchanger) connected in sequence. The fluorescent concentrator includes a transparent substrate (plexiglass with a refractive index of 1.5%) and a fluorescent layer (cadmium sulfide / cadmium selenide quantum dots, with a mass ratio of cadmium sulfide to cadmium selenide of 1:4) and a protective layer (a composite protective layer of silicon dioxide and titanium dioxide, with a mass ratio of 1:1) sequentially disposed on the surface of the transparent substrate. The heat storage component 13 includes a first Molten salt storage component 131 and second molten salt storage component 132 are cyclically connected, including the heat collection component 12, the first molten salt storage component 131, the heat exchange component 14, and the second molten salt storage component 132. The outer wall of the first molten salt storage component 131 is provided with five layers of first insulation (material: ceramic fiber blanket), and the inner wall of the first molten salt storage component 131 is provided with a first corrosion-resistant coating (material: high-purity alumina (Al2O3) coating). The outer wall of the second molten salt storage component 132 is provided with five layers of second insulation (material: aluminosilicate fiber felt), and the inner wall of the second molten salt storage component 132 is provided with a second corrosion-resistant coating (material: nickel-based alloy coating, Inconel). 738, which mainly contains 53wt% Ni, 19wt% Cr, 18wt% Fe, 5wt% Nb, 3wt% Mo, 0.9wt% Ti, 0.5wt% Al and the balance unavoidable impurities); the heat exchange component 14 includes a shell and heat exchange tubes disposed inside the shell, wherein molten salt flows through the heat exchange tubes, and the working fluid (water / steam) flows through the area between the shell and the heat exchange tubes; the power generation unit is used to convert the thermal energy transmitted by the solar thermal unit into electrical energy and transmit the electrical energy to the control unit 2, the power generation unit includes a steam turbine 15, a power generation component 16, and a transformer component 17;

[0110] The control unit 2 includes a power control unit 21 and a gas control unit 22. The power control unit 21 is used to receive electrical energy transmitted by the power generation unit and drive the plasma reactor array 3. The power control unit 21 includes a power input module, an energy storage module, a plasma power supply module, a cooling module, and a human-machine control module. The plasma power supply module is equipped with 10 plasma power supplies. An electromagnetic shielding layer is independently provided between any two modules of the power input module, the energy storage module, and the human-machine control module. The gas control unit 22 includes a gas supply module, a flow control module, and a gas mixing module. The gas storage unit 4 is connected to the main gas outlet of the plasma reactor array 3 and is used to store the product gas processed by the plasma reactor array 3.

[0111] Example 2

[0112] This embodiment provides a plasma reactor array, which is the same as that in Embodiment 1 except that it includes 12 basic units arranged in a honeycomb stack.

[0113] This embodiment also provides a device for a photothermal driven plasma reactor array, which is the same as that in Embodiment 1 except that it uses the plasma reactor array described in this embodiment.

[0114] Example 3

[0115] This embodiment provides a plasma reactor array, which is the same as that in Embodiment 1 except that it includes 6 basic units arranged in a honeycomb stack.

[0116] This embodiment also provides a device for a photothermal driven plasma reactor array, which is the same as that in Embodiment 1 except that it uses the plasma reactor array described in this embodiment.

[0117] Example 4

[0118] This embodiment provides a plasma reactor array, which is the same as in Embodiment 1 except that the length of the discharge region in the dielectric barrier discharge plasma reactor accounts for 20% of the length of the inner electrode, that is, the area with the threaded structure on the inner electrode accounts for 20% of the total length of the inner electrode.

[0119] This embodiment also provides a device for a photothermal driven plasma reactor array, which is the same as that in Embodiment 1 except that it uses the plasma reactor array described in this embodiment.

[0120] Example 5

[0121] This embodiment provides a plasma reactor array. Except for the fact that the length of the discharge region in the dielectric barrier discharge plasma reactor accounts for 60% of the length of the inner electrode, that is, the area on the inner electrode with a threaded structure accounts for 60% of the total length of the inner electrode, the rest of the plasma reactor array is the same as that in Embodiment 1.

[0122] This embodiment also provides a device for a photothermal driven plasma reactor array, which is the same as that in Embodiment 1 except that it uses the plasma reactor array described in this embodiment.

[0123] Example 6

[0124] This embodiment provides a plasma reactor array. Except for the thickness of the cavity region being 2 mm, the plasma reactor array provided in this embodiment is the same as that in Embodiment 1.

[0125] This embodiment also provides a device for a photothermal driven plasma reactor array, which is the same as that in Embodiment 1 except that it uses the plasma reactor array described in this embodiment.

[0126] Example 7

[0127] This embodiment provides a plasma reactor array, which is the same as that in Embodiment 1 except that the thickness of the cavity region is 1 mm.

[0128] This embodiment also provides a device for a photothermal driven plasma reactor array, which is the same as that in Embodiment 1 except that it uses the plasma reactor array described in this embodiment.

[0129] Example 8

[0130] This embodiment provides a plasma reactor array. Except for the vertical distance between the axes of any two adjacent dielectric barrier discharge plasma reactors being 90 mm, the plasma reactor array provided in this embodiment is the same as that in Embodiment 1.

[0131] This embodiment also provides a device for a photothermal driven plasma reactor array, which is the same as that in Embodiment 1 except that it uses the plasma reactor array described in this embodiment.

[0132] Example 9

[0133] This embodiment provides a plasma reactor array. Except for the vertical distance between the axes of any two adjacent dielectric barrier discharge plasma reactors being 120 mm, the plasma reactor array provided in this embodiment is the same as that in Embodiment 1.

[0134] This embodiment also provides a device for a photothermal driven plasma reactor array, which is the same as that in Embodiment 1 except that it uses the plasma reactor array described in this embodiment.

[0135] II. Comparative Example

[0136] Comparative Example 1

[0137] This comparative example provides a plasma reactor array, which is identical to that of Example 1 except that the seven basic units are arranged in parallel vertically.

[0138] This comparative example also provides a device for a photothermal driven plasma reactor array, which is the same as that in Example 1 except that it uses the plasma reactor array described in this comparative example.

[0139] Comparative Example 2

[0140] This comparative example provides a plasma reactor array, which is the same as in Example 1 except that the six dielectric barrier discharge plasma reactors in the basic unit are arranged in a rectangular shape and the basic unit is also arranged in a rectangular shape.

[0141] This comparative example also provides a device for a photothermal driven plasma reactor array, which is the same as that in Example 1 except that it uses the plasma reactor array described in this comparative example.

[0142] III. Tests and Results

[0143] The CO2 conversion test was conducted using the photothermal driven plasma reactor array provided in the above embodiments or comparative examples. The test conditions were as follows: the volume ratio of CO2 to H2 in the feed gas was 1:3, the input voltage of the plasma reactor array was 55V, the temperature was 200℃, and the gas flow rate of the basic unit was 100mL / min. The test results are shown in Table 1.

[0144] Table 1

[0145]

[0146] As can be seen from Table 1:

[0147] (1) As can be seen from the comprehensive examples 1 to 3, the present invention designs the six dielectric barrier discharge plasma reactors in the basic unit to be arranged in a hexagonal structure and designs n basic units to be stacked in a honeycomb pattern. The two work together to improve the efficiency of the photothermal driven plasma reactor array in processing CO2. The conversion rate of CO2 is increased to more than 54.0%, while the selectivity of CO is increased to more than 98.0%.

[0148] (2) As can be seen from the combined embodiments 1 and 4 to 9, the present invention further improves the efficiency of the photothermal driven plasma reactor array in processing CO2 or CO selectivity and reduces space waste by further optimizing the length of the discharge region to be 25-50% of the length of the inner electrode, or further optimizing the thickness of the cavity region to be 1.3-1.7 mm, even more preferably 1.5 mm, or further optimizing the vertical distance between the axes of any two adjacent dielectric barrier discharge plasma reactors in the plasma reactor array to be 100-110 mm.

[0149] (3) It can be seen from the comprehensive comparison of Example 1 with Comparative Examples 1 and 2 that the seven basic units in the plasma reactor array of Comparative Example 1 are arranged in parallel, resulting in wasted space; and the six dielectric barrier discharge plasma reactors in the basic unit of Comparative Example 2 are arranged in a rectangular shape, and the basic unit is also arranged in a rectangular shape, resulting in flow dead zones and "hot spots" and "cold spots" in energy distribution in the reactor array, which increases the non-uniformity of the discharge area, resulting in poor energy utilization efficiency and limiting the effective integration scale and processing throughput of the reactor unit. This shows that the present invention designs the six dielectric barrier discharge plasma reactors in the basic unit to be arranged in a regular hexagonal structure, and designs n basic units to be stacked in a honeycomb shape. The two work together to significantly improve the CO2 processing efficiency, and also solves the problems that the current low-temperature plasma technology is difficult to match with renewable energy and the low flow rate of the low-temperature plasma reactor is small and difficult to meet the large flow rate requirements. It has high economic efficiency and operability.

[0150] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A plasma reactor array, characterized in that, The plasma reactor array comprises n basic units arranged in a honeycomb-like stacked pattern, where n ≥ 2; The basic unit comprises six dielectric barrier discharge plasma reactors arranged in a hexagonal structure.

2. The plasma reactor array according to claim 1, characterized in that, The vertical distance between the axes of any two adjacent dielectric barrier discharge plasma reactors in the plasma reactor array is 100~110mm. Preferably, each of the basic units is provided with an intake manifold and an exhaust manifold.

3. The plasma reactor array according to claim 1 or 2, characterized in that, The dielectric barrier discharge plasma reactor includes an outer electrode, an inner electrode, and a barrier dielectric layer; Preferably, the external electrode includes a ring-shaped structure with a mesh; Preferably, the internal electrode comprises a metal cylindrical structure with a threaded structure; Preferably, the inner electrode is disposed inside the outer electrode; Preferably, the barrier medium layer comprises a ring-shaped structure; Preferably, the barrier dielectric layer forms the inner wall of the outer electrode.

4. The plasma reactor array according to claim 3, characterized in that, The dielectric barrier discharge plasma reactor also includes a discharge zone, an inlet manifold, and an outlet manifold. Preferably, the discharge region includes an annular cavity region between the region where the inner electrode is provided with a threaded structure and the region of the opposing barrier dielectric layer; Preferably, the length of the discharge region accounts for 25-50% of the length of the inner electrode; Preferably, the thickness of the barrier dielectric layer is 2.5~3.5mm; Preferably, the thickness of the cavity region is 1.3~1.7mm; Preferably, with the axis of the discharge zone as the center line, the intake manifold and the exhaust manifold are symmetrically arranged on the outer wall of the barrier medium layer and communicate with the discharge zone.

5. The plasma reactor array according to claim 4, characterized in that, The inlet manifold of each dielectric barrier discharge plasma reactor in each basic unit is connected to the main inlet pipe of the corresponding basic unit. Preferably, the exhaust manifold of each dielectric barrier discharge plasma reactor in each basic unit is connected to the exhaust main of the corresponding basic unit.

6. A device for a photothermal driven plasma reactor array, characterized in that, The device includes a solar thermal power generation unit, a control unit, and a plasma reactor array as described in any one of claims 1 to 5, connected in sequence.

7. The apparatus according to claim 5, characterized in that, The solar thermal power generation unit includes a solar thermal unit and a power generation unit connected together; Preferably, the photothermal unit is used to convert light into heat energy and transmit it to the power generation unit; Preferably, the power generation unit is used to convert the thermal energy transmitted by the solar thermal unit into electrical energy and to transmit the electrical energy to the control unit.

8. The apparatus according to claim 7, characterized in that, The control unit includes a power control unit and a gas control unit; Preferably, the power control unit is used to receive electrical energy transmitted by the power generation unit and drive the plasma reactor array; Preferably, the gas control unit is used to deliver raw material gas to the main inlet pipe of the plasma reactor array.

9. The apparatus according to claim 8, characterized in that, The power control unit includes a power input module, an energy storage module, and a plasma power supply module; Preferably, the plasma power supply module is provided with n plasma power supplies, where n≥2; Preferably, the gas control unit includes a gas supply module, a flow control module, and a gas mixing module.

10. The apparatus according to any one of claims 6 to 9, characterized in that, The device also includes a gas storage unit; Preferably, the gas storage unit is connected to the main gas outlet pipe of the plasma reactor array and is used to store the product gas processed by the plasma reactor array.

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