A multi-reactor tube plasma reactor and a switching control method thereof

Abstract

The present application relates to the technical field of plasma, in particular to a multi-reaction-tube plasma reactor and a switching control method thereof. The reactor has a reactor inlet and a reactor outlet, and comprises a gas mixing tank, a plurality of gas inlet tubes and a plurality of reaction tubes. The plurality of gas inlet tubes are arranged in one-to-one correspondence with the plurality of reaction tubes, forming a plurality of single-tube reaction branches. Parallel valve control components are arranged between the gas inlet tubes and the reaction tubes, and series valve control components are arranged between the reaction tubes and the reactor outlet. By controlling the parallel valve control components and the series valve control components, the reactor can be flexibly switched between single-tube independent working mode, parallel working mode and series working mode without disassembling the pipeline. The present application also provides a corresponding switching control method, and further realizes a series-parallel hybrid reaction structure. The present application integrates the gas mixing function, effectively solves the problems of limited processing flux, difficult residence time regulation, uneven gas distribution and complicated mode switching in the prior art.

Description

Technical Field

[0001] This invention relates to the field of plasma reactor technology, and in particular to a multi-reaction tube plasma reactor and its switching control method. Background Technology

[0002] Plasma technology is widely used in fields such as waste gas treatment, wastewater purification, material surface modification, nitrogen fixation, carbon fixation, and chemical synthesis. Low-temperature plasma utilizes high-energy electrons, free radicals, and other active particles to interact with species molecules, causing them to be activated or decomposed in a very short time.

[0003] Traditional plasma reactors mostly adopt a single-tube structure, which has the following shortcomings: First, the processing capacity is limited, making it difficult to meet the needs of high-flow-rate scenarios. Increasing the tube diameter will lead to uneven discharge and reduced energy utilization. Second, the length of the discharge region is limited, and the residence time is difficult to adjust flexibly, resulting in poor degradation effect on pollutants that require a long processing time. Third, once the single-tube structure is damaged, the entire reactor will fail, resulting in high maintenance costs and poor operational reliability.

[0004] To address the aforementioned issues, existing technologies have proposed multi-tube parallel reactors and multi-stage series reactors. For example, patent CN103611395A discloses a wire-tube type low-temperature plasma unit reactor and its combined system, which can be combined in series and parallel to form a reactor matrix; patent CN206136437U discloses a slender tube radio frequency inductively coupled plasma source reactor, which can generate slender plasma with adjustable length by multiple series connections; and patent CN216440598U discloses a multi-electrode dielectric barrier discharge low-temperature plasma reactor, which uses multiple parallel external electrodes to improve the edge effect.

[0005] However, these existing technologies still have the following drawbacks: the intake pipeline structure is simple, and when treating gases that need to be premixed, a separate gas mixing device must be used, resulting in low system integration; in the parallel structure, the gas flow distribution is uneven due to the difference in pipeline resistance among the reaction tubes, lacking effective uniform control methods, and the discharge state is inconsistent, affecting the stability of the treatment effect; switching between parallel and series modes requires disassembling and reassembling the pipeline, which is cumbersome. Summary of the Invention

[0006] The purpose of this invention is to provide a multi-reaction tube plasma reactor to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0007] The technical solution adopted to solve the above-mentioned technical problems is as follows: According to a first aspect of the present invention, a multi-reaction tube plasma reactor has a reactor inlet and a reactor outlet, and includes: a mixing tank, multiple inlet pipes and multiple reaction tubes; Multiple air inlet pipes and multiple reaction pipes are arranged in a one-to-one correspondence, forming multiple single-pipe reaction branches between the reactor inlet and the reactor outlet; A parallel valve control assembly is provided between the intake pipe and the reaction pipe. The intake pipe is connected to or disconnected from the reaction pipe through the parallel valve control assembly; or, connected to or disconnected from the mixing tank; or, sequentially connected to the mixing tank and the reaction pipe. A series valve control assembly is provided between the reaction tube and the reactor outlet. The reaction tube is connected to the reactor outlet through the series valve control assembly, or it is connected end-to-end to another reaction tube.

[0008] The multi-reaction tube plasma reactor according to embodiments of the present invention has at least the following advantages: by setting parallel and series valve control components, flexible switching between single-tube, parallel, and series operating modes is achieved, adapting to different process requirements for processing flow rates and depths without disassembling the pipeline. Simultaneously, the integrated design of the mixing tank and the inlet pipeline allows for uniform mixing of multiple gases within the reactor, eliminating the need for external independent mixing equipment, significantly improving system integration and ease of operation.

[0009] As a further improvement to the above technical solution, the reaction tube includes a dielectric barrier discharge tube, which includes an outer electrode sleeved on the outer wall and an inner electrode arranged along the central axis of the eye. The inner electrode and the outer electrode are respectively electrically connected to a high-voltage power supply module.

[0010] As a further improvement to the above technical solution, the dielectric barrier discharge tube is made of quartz glass or ceramic tube, the inner electrode is made of stainless steel rod, tungsten rod or copper rod, and the outer electrode is made of metal mesh, metal foil or conductive coating.

[0011] As a further improvement to the above technical solution, each of the intake pipes is provided with a first flow valve, which is used to control the flow rate and speed of the corresponding single-pipe reaction branch.

[0012] As a further improvement to the above technical solution, a second flow valve is provided between the mixing tank and the multiple reaction tubes, and the multiple second flow valves are used to control the flow rate and speed of the corresponding reaction tubes.

[0013] As a further improvement to the above technical solution, the multi-reaction tube plasma reactor also includes an outer shell, on which the reactor inlet and the reactor outlet are both located, and within which the gas inlet pipe, the gas mixing tank, and the reaction tube are all located.

[0014] As a further improvement to the above technical solution, an insulating partition is provided inside the outer shell, which divides the inner cavity of the outer shell into a high-voltage discharge area and a gas pipeline area. The air inlet pipe and the gas mixing tank are both located in the gas pipeline area, and the reaction tube is located in the high-voltage discharge area. The high-voltage discharge area is also provided with a high-voltage power supply module that is electrically connected to the reaction tube.

[0015] As a further improvement to the above technical solution, the high-voltage discharge area is provided with a cooling jacket and a cooling fan. The cooling jacket is connected to the reaction tube and / or the high-voltage power module, and the cooling fan connects the high-voltage discharge area to the outside of the outer casing. The cooling fan is used to dissipate heat from the high-voltage discharge area.

[0016] According to a second aspect of the present invention, a switching control method applicable to the above-described multi-reactor plasma reactor includes: The parallel valve control assembly is controlled to connect the inlet pipe to the reaction pipe and disconnect the gas mixing tank. The series valve control element is also controlled to connect the reaction pipe to the reactor outlet, thereby allowing the multi-reaction-tube plasma reactor to form a single-tube reaction structure. Multiple single-tube reaction branches work independently to perform plasma treatment on different gases. The parallel valve control assembly is controlled to connect the gas inlet pipe to the gas mixing tank and the reaction tube in sequence. The series valve control element is controlled to connect the reaction tube to the reactor outlet, thereby allowing the multi-reaction tube plasma reactor to form a parallel reaction structure. The reaction tubes of the multiple single-tube reaction branches are connected in parallel to each other, and the mixed gas in the gas mixing tank is uniformly distributed and synchronously treated with plasma. One of the single-tube reaction branches is used as the inlet branch, and the remaining single-tube reaction branches are used as series branches. The parallel valve control assembly of the inlet branch is controlled to connect the inlet pipe to the reaction tube and disconnect the mixing tank, or to connect the inlet pipe to the mixing tank and the reaction tube in sequence. At the same time, the parallel valve control assembly of the series branches is controlled to disconnect the reaction tube from the inlet pipe and the mixing tank. Furthermore, the series valve control assembly is controlled to connect the reaction tubes of the inlet branch and the reaction tubes of the series branches end to end in sequence, thereby forming a series reaction structure in the multi-reaction tube plasma reactor, with multiple reaction tubes connected in series, and the gas to be treated flows through multiple reaction tubes in sequence for plasma treatment.

[0017] The switching control method according to embodiments of the present invention has at least the following beneficial effects: Through the logical combination of valve control components, one-button switching between single-pipe, parallel, and series operating modes is achieved without disassembling any pipelines. The single-pipe mode is suitable for independent treatment or comparative experiments of multiple streams with different gas components; the parallel mode is suitable for uniform treatment under high flow conditions, which can multiply the treatment throughput; and the series mode significantly improves the removal efficiency of recalcitrant pollutants or the conversion rate of complex chemical reactions by extending the total residence time of the gas in the reaction zone. This method greatly expands the process adaptability of the reactor and reduces operational complexity and maintenance costs.

[0018] As a further improvement to the above technical solution, there are multiple air intake branches, and the multiple air intake branches and the corresponding series branches form multiple series reaction structures. The multiple series reaction structures are arranged in parallel with each other, so that the multi-reaction tube plasma reactor forms a series and parallel mixed reaction structure. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a schematic diagram of an embodiment of the multi-reaction tube plasma reactor provided by the present invention. Figure 2 This is a schematic diagram of the structure of a single-tube mode of the multi-reaction tube plasma reactor provided by the present invention. Figure 3 This is a schematic diagram of an embodiment of the multi-reaction tube plasma reactor provided by the present invention, in parallel mode; Figure 4 This is a schematic diagram of the multi-reaction tube plasma reactor provided by the present invention, in one embodiment in series mode. Figure 1 ; Figure 5 This is a schematic diagram of the multi-reaction tube plasma reactor provided by the present invention, in one embodiment in series mode. Figure 2 ; Figure 6 This is a schematic diagram of the multi-reactor plasma reactor provided by the present invention, in one embodiment of a series-parallel hybrid configuration. Figure 1 ; Figure 7 This is a schematic diagram of the multi-reactor plasma reactor provided by the present invention, in one embodiment of a series-parallel hybrid configuration. Figure 2 .

[0020] In the diagram: 100 - reactor inlet, 200 - air inlet pipe, 210 - first flow valve, 300 - parallel valve control assembly, 400 - mixing tank, 410 - second flow valve, 500 - reaction pipe, 600 - series valve control assembly, 700 - reactor outlet. Detailed Implementation

[0021] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0023] In the description of this invention, if there are words such as "several", they mean one or more, "multiple" means two or more, "greater than", "less than", "exceeding" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself.

[0024] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0025] Reference Figure 1 The multi-reaction tube plasma reactor of the present invention is exemplified as follows: A multi-reaction tube 500 plasma reactor, the multi-reaction tube 500 plasma reactor having a reactor inlet 100 and a reactor outlet 700, the multi-reaction tube 500 plasma reactor comprising: a mixing tank 400, multiple inlet pipes 200 and multiple reaction tubes 500.

[0026] Multiple air inlet pipes 200 and multiple reaction pipes 500 are arranged in a one-to-one correspondence and form multiple single-pipe reaction branches between the reactor inlet 100 and the reactor outlet 700.

[0027] A parallel valve control assembly 300 is provided between the intake pipe 200 and the reaction pipe 500. The intake pipe 200 is connected to or disconnected from the reaction pipe 500 through the parallel valve control assembly 300; or, the intake pipe 200 is connected to or disconnected from the mixing tank 400 through the parallel valve control assembly 300; or, the intake pipe 200 is sequentially connected to the mixing tank 400 and the reaction pipe 500 through the parallel valve control assembly 300.

[0028] A series valve control assembly 600 is provided between the reaction tube 500 and the reactor outlet 700. The reaction tube 500 is connected to the reactor outlet 700 through the series valve control assembly 600, or it is connected end-to-end to another reaction tube 500.

[0029] In practical use, when multiple inlet pipes 200 are connected one-to-one to multiple reaction pipes 500 via parallel valve control elements, and the reaction pipes 500 are connected to the reactor outlet 700 via series valve control elements, the multiple single-pipe reaction branches are independent of each other, and the multi-reaction-pipe 500 plasma reactor forms a single-pipe reaction structure. When multiple inlet pipes 200 are sequentially connected to the mixing tank 400 and the corresponding reaction pipe 500 via parallel valve control elements, and the outlet end is connected to the reactor outlet 700 via series valve control elements, the multiple single-pipe reaction branches are arranged in parallel, and the multi-reaction-pipe 500 plasma reactor forms a parallel reaction structure. When a reaction pipe 500 is connected to another reaction pipe 500 via a series valve control element, the multiple single-pipe reaction branches are connected in series, and the multi-reaction-pipe 500 plasma reactor forms a series reaction structure.

[0030] The multi-reaction tube 500 plasma reactor in this embodiment, through the configuration of parallel valve control components 300 and series valve control components 600, achieves flexible switching between single-tube, parallel, and series operating modes, adapting to different process requirements for processing flow rates and depths without disassembling the pipeline. Simultaneously, the integrated design of the mixing tank 400 and the inlet pipe 200 allows for uniform mixing of multiple gases within the reactor, eliminating the need for external independent mixing equipment and significantly improving system integration and operational convenience.

[0031] The reaction tube 500 includes a dielectric barrier discharge tube, which comprises an outer electrode sleeved on the outer wall and an inner electrode arranged along the central axis. The inner electrode and the outer electrode are electrically connected to a high-voltage power supply module. In this embodiment, the reaction tube 500 employs a dielectric barrier discharge tube structure, enabling the generation of stable and uniform low-temperature plasma under normal pressure. During discharge, the dielectric layer effectively suppresses arc discharge, improving operational safety. The coaxial structure, with the inner electrode arranged along the central axis and the outer electrode sleeved on the outer wall, facilitates the formation of a uniform annular electric field, enhancing the generation efficiency of active particles, thereby improving the uniformity and reaction rate of plasma treatment.

[0032] In a further embodiment, the dielectric barrier discharge tube is made of quartz glass or ceramic, the inner electrode is made of stainless steel, tungsten, or copper rods, and the outer electrode is made of metal mesh, metal foil, or a conductive coating. Quartz glass and ceramics have high dielectric constants, good high-temperature resistance, and corrosion resistance, making them suitable for treating highly oxidizing or corrosive waste gases and wastewater. The inner electrode is made of stainless steel, tungsten, or copper, which are highly conductive metals, while the outer electrode is made of metal mesh, metal foil, or a conductive coating, facilitating processing and forming and ensuring a tight fit with the tube wall. This combination of materials ensures discharge efficiency while also considering cost control and long-term operational stability.

[0033] In this embodiment, each of the inlet pipes 200 is equipped with a first flow valve 210, which is used to control the inflow rate and velocity of the corresponding single-pipe reaction branch. The independent installation of a first flow valve 210 on each inlet pipe 200 allows for precise adjustment of the inflow rate of each single-pipe reaction branch, effectively overcoming the problem of uneven flow distribution caused by differences in pipe resistance. In single-pipe or multi-path independent processing modes, optimal processing flow rates can be set for different gases, significantly improving the flexibility of process control.

[0034] In this embodiment, a second flow valve 410 is provided between the mixing tank 400 and each of the multiple reaction tubes 500. The multiple second flow valves 410 are used to control the flow rate and velocity of the corresponding reaction tube 500. The placement of the second flow valves 410 between the mixing tank 400 and each reaction tube 500 allows for independent flow rate fine-tuning when the gas, after being uniformly mixed in the mixing tank 400, is distributed to each reaction tube 500. In parallel operation mode, this ensures that each reaction tube 500 receives a uniform gas flow rate, thereby maintaining consistency in the discharge state and processing effect of each tube. This design not only ensures the consistency of the mixed gas composition but also compensates for resistance differences between the reaction tubes 500 caused by variations in manufacturing tolerances or aging levels, thus achieving truly uniform distribution in parallel mode and further improving the stability and repeatability of the processing effect.

[0035] The multi-reaction tube 500 plasma reactor also includes an outer shell. The reactor inlet 100 and reactor outlet 700 are both located on the outer shell, and the inlet pipe 200, mixing tank 400, and reaction tube 500 are all located within the outer shell. In this embodiment, the multi-reaction tube 500 plasma reactor integrates the inlet pipe 200, mixing tank 400, and reaction tube 500 into a single outer shell, forming an integrated structure. This reduces the number of external connecting pipes, lowers the risk of gas leakage, and reduces system pressure loss. Simultaneously, the integrated design facilitates equipment transportation, installation, and on-site deployment, and also improves the equipment's aesthetics and operational safety, making it particularly suitable for applications requiring space and cleanliness, such as laboratories and industrial sites.

[0036] Furthermore, an insulating partition is provided within the outer casing, dividing the inner cavity of the outer casing into a high-voltage discharge area and a gas pipeline area. The inlet pipe 200 and the mixing tank 400 are both located in the gas pipeline area, while the reaction tube 500 is located in the high-voltage discharge area. The high-voltage discharge area also includes a high-voltage power supply module electrically connected to the reaction tube 500. By physically isolating the high-voltage discharge area from the gas pipeline area through the insulating partition, the electromagnetic interference and electro-corrosion risks of high-voltage discharge to the inlet pipe 200, the mixing tank 400, and various valve control components are effectively avoided, improving the electrical safety and long-term operational reliability of the equipment. Simultaneously, the partitioned layout makes the internal structure clearer, facilitating installation, maintenance, and troubleshooting, and also reducing the potential threat to operators from the high-voltage area.

[0037] In a further embodiment, the high-voltage discharge area is equipped with a cooling jacket and a cooling fan. The cooling jacket is in direct contact with the reaction tube 500 and the high-voltage power module, thereby transferring heat. The cooling fan connects the high-voltage discharge area to the outside of the outer casing and is used to dissipate heat from the high-voltage discharge area. To improve heat dissipation efficiency, at least a portion of the cooling jacket is aligned with the airflow axis of the cooling fan. Significant heat is generated during high-voltage discharge and plasma reaction. Poor heat dissipation can lead to accelerated aging of the reaction tube 500 material, decreased discharge efficiency, and even dielectric breakdown. The cooling jacket can provide direct or indirect liquid or air cooling for the reaction tube 500 and the high-voltage power module, while the cooling fan forces the hot air from the high-voltage discharge area to the outer casing. The two work together to form an efficient thermal management solution, ensuring that the equipment maintains stable discharge performance and service life under high-power, long-term operation conditions.

[0038] The parallel valve control assembly 300 is used to switchably connect or disconnect the intake pipe 200 from the reaction pipe 500, sequentially connect the intake pipe 200, the mixing tank 400, and the reaction pipe 500, and connect or disconnect the intake pipe 200 from the mixing tank 400. The parallel valve control assembly 300 can be one or more of the following: a selector valve, a two-position three-way valve, a three-position five-way valve, a shut-off valve, a check valve, and a flow valve.

[0039] The series valve control assembly 600 is used to switchably connect the outlet of the reaction tube 500 to the reactor outlet 700 or the inlet of another reaction tube 500. In this embodiment, the series valve control assembly 600 adopts a two-position three-way valve, so that the outlet of the reaction tube 500 can be connected to the reactor outlet 700 or another reaction tube 500.

[0040] like Figure 1 As shown, in this embodiment, there are four inlet pipes 200 and four reaction pipes 500. The four inlet pipes 200 and four reaction pipes 500 are arranged one-to-one between the reactor inlet 100 and the reactor outlet 700 to form four single-pipe reaction branches.

[0041] This invention also provides a switching control method applicable to the above-mentioned multi-reaction tube 500 plasma reactor, so that the multi-reaction tube 500 plasma reactor can switch between different operating modes.

[0042] The switching control method of this invention includes: controlling the multi-reaction tube 500 plasma reactor to switch to single-tube mode. Specifically, the parallel valve control component 300 is controlled to connect the inlet pipe 200 to the reaction tube 500 and disconnect the mixing tank 400. Furthermore, the series valve control element is controlled to connect the reaction tube 500 to the reactor outlet 700, thereby allowing the multi-reaction tube 500 plasma reactor to form a single-tube reaction structure, with multiple single-tube reaction branches operating independently to perform plasma treatment on different gases.

[0043] based on Figure 1 The multi-reaction tube 500 plasma reactor shown has four single-tube reaction branches, such as... Figure 2 As shown, the multi-reaction tube 500 plasma reactor forms a single-tube reaction structure. The four inlet pipes 200 are connected to the four reaction tubes 500 respectively. The four single-tube reaction branches work independently, and four different gases can be controlled to enter each reaction tube 500 from the four inlet pipes 200 respectively, and perform plasma treatment independently without interfering with each other.

[0044] The switching control method of this embodiment further includes: controlling the multi-reaction tube 500 plasma reactor to switch to parallel mode. Specifically, the parallel valve control component 300 is controlled to connect the gas inlet pipe 200 sequentially to the gas mixing tank 400 and the reaction tube 500, and the series valve control element is controlled to connect the reaction tube 500 to the reactor outlet 700, thereby allowing the multi-reaction tube 500 plasma reactor to form a parallel reaction structure, with the reaction tubes 500 of the multiple single-tube reaction branches connected in parallel to each other, uniformly distributing and synchronously performing plasma treatment on the mixed gas in the gas mixing tank 400.

[0045] based on Figure 1 The multi-reaction tube 500 plasma reactor shown has four single-tube reaction branches, such as... Figure 3 As shown, the multi-reaction tube 500 plasma reactor forms a parallel reaction structure. Four inlet pipes 200 are all connected to a mixing tank 400, allowing control of the introduction of four different gases into the four inlet pipes 200. After thorough mixing within the mixing tank 400, the different gases flow into the four reaction tubes 500 respectively for plasma treatment. Furthermore, the gas flow rate and velocity are uniformly adjusted by second flow meters on each branch, ensuring consistent gas flow in each reaction tube 500 and avoiding uneven distribution due to differences in pipe resistance.

[0046] The switching control method of this embodiment further includes: controlling the multi-reaction tube 500 plasma reactor to switch to a series mode. Specifically: one of the single-tube reaction branches is used as the inlet branch, and the remaining single-tube reaction branches are used as series branches. The parallel valve control assembly 300 of the inlet branch is controlled to connect the inlet pipe 200 to the reaction tube 500 and disconnect the mixing tank 400, or the inlet pipe 200 is sequentially connected to the mixing tank 400 and the reaction tube 500. At the same time, the parallel valve control assembly 300 of the series branch is controlled to disconnect the reaction tube 500 from the inlet pipe 200 and the mixing tank 400. Furthermore, the series valve control assembly 600 is controlled to connect the reaction tubes 500 of the inlet branch and the reaction tubes 500 of the series branch sequentially end to end. Through the above control, the multi-reaction tube 500 plasma reactor is made into a series reaction structure, with multiple reaction tubes 500 connected in series, and the gas to be treated flows through multiple reaction tubes 500 in sequence for plasma treatment.

[0047] based on Figure 1 The multi-reaction tube 500 plasma reactor shown has four single-tube reaction branches, such as... Figure 4 and Figure 5As shown, the intake branch is connected end to end with the reaction tubes 500 of the other three series branches to form a series reaction structure. The gas flows through the four reaction tubes 500 in sequence, and the total residence time is the sum of the residence times of each tube, thus achieving deep treatment of the gas.

[0048] In this embodiment, refer to Figure 4 The gas to be treated is directly introduced into the series path through the inlet pipe 200 to achieve series treatment. Alternatively, refer to... Figure 5 It can control four different gases to be introduced through four air inlet pipes 200. After the different gases are fully mixed in the mixing tank 400, they flow through four reaction pipes 500 in sequence to achieve series processing.

[0049] The switching control method of this invention, through the logical combination of valve control components, achieves one-click switching between three operating modes: single-pipe, parallel, and series, without disassembling any pipelines. The single-pipe mode is suitable for independent treatment or comparative experiments of multiple streams with different gas compositions; the parallel mode is suitable for uniform treatment under high-flow conditions, which can significantly increase the treatment throughput; and the series mode significantly improves the removal efficiency of recalcitrant pollutants or the conversion rate of complex chemical reactions by extending the total residence time of the gas in the reaction zone. This method greatly expands the process adaptability of the reactor and reduces operational complexity and maintenance costs.

[0050] In a further embodiment, the switching control method further includes: controlling the multi-reaction tube 500 plasma reactor to switch to a series-parallel hybrid mode. Specifically: there are multiple air inlet branches, and the multiple air inlet branches and the corresponding series branches form multiple series reaction structures. The multiple series reaction structures are arranged in parallel with each other, thereby allowing the multi-reaction tube 500 plasma reactor to form a series-parallel hybrid reaction structure.

[0051] based on Figure 1 The multi-reaction tube 500 plasma reactor shown has four single-tube reaction branches, such as... Figure 6 and Figure 7 As shown, two single-tube reaction branches serve as intake branches, and the other two single-tube reaction branches serve as series branches. Each of the two intake branches is connected end-to-end to a reaction tube 500 of a series branch, forming two series reaction structures. These two series reaction structures are arranged side-by-side. In other words, the four single-tube reaction branches form two series reaction structures, and simultaneously, the two series reaction structures are arranged side-by-side to form a parallel reaction structure.

[0052] In this embodiment, refer to Figure 6 The gas to be treated can be introduced into two series-connected reaction structures through two separate inlet branches, and then processed sequentially through two reaction tubes 500. The two series-connected reaction structures operate independently without interference. Alternatively, refer to... Figure 7 It can control four intake pipes 200 to introduce four different gases. After the different gases are fully mixed in the mixing tank 400, they are respectively introduced into two series reaction structures for series processing in two reaction tubes 500. The two series reaction structures can achieve uniform distribution and synchronous processing.

[0053] In other embodiments, the number of single-tube reaction branches in the multi-reaction-tube 500 plasma reactor can be set according to requirements, and can be divided into multiple inlet branches and multiple series branches. Each inlet branch can be connected end to end with one or more series branches of the reaction tube 500, thereby forming a series reaction structure with different residence times. These different series reaction structures can also form a parallel reaction structure, which can adapt to uniform treatment under different flow conditions, or flexibly switch for different treatment depth requirements and different gas sources, greatly expanding the flexibility and adaptability of the reactor.

[0054] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0055] Although embodiments of the present invention have been shown and described, those skilled in the art can make various changes, modifications, substitutions and alterations to these embodiments without departing from the principles and spirit of the invention. All such changes, modifications, equivalent alterations or substitutions are included within the scope defined by the claims of this application, and the scope of the invention is defined by the claims and their equivalents.

Claims

1. A multi-reaction tube plasma reactor, characterized in that: The multi-reaction tube plasma reactor has a reactor inlet and a reactor outlet, and the multi-reaction tube plasma reactor includes: a mixing tank, multiple inlet pipes and multiple reaction tubes; Multiple air inlet pipes and multiple reaction pipes are arranged in a one-to-one correspondence, forming multiple single-pipe reaction branches between the reactor inlet and the reactor outlet; A parallel valve control assembly is provided between the intake pipe and the reaction pipe. The intake pipe is connected to or disconnected from the reaction pipe through the parallel valve control assembly; or, connected to or disconnected from the mixing tank; or, sequentially connected to the mixing tank and the reaction pipe. A series valve control assembly is provided between the reaction tube and the reactor outlet. The reaction tube is connected to the reactor outlet through the series valve control assembly, or it is connected end-to-end to another reaction tube.

2. The multi-reaction tube plasma reactor according to claim 1, characterized in that: The reaction tube includes a dielectric barrier discharge tube, which includes an outer electrode sleeved on the outer wall and an inner electrode arranged along the central axis of the eye. The inner electrode and the outer electrode are electrically connected to the high-voltage power supply module, respectively.

3. The multi-reaction tube plasma reactor according to claim 2, characterized in that: The dielectric barrier discharge tube is made of quartz glass or ceramic tube, the inner electrode is made of stainless steel rod, tungsten rod or copper rod, and the outer electrode is made of metal mesh, metal foil or conductive coating.

4. The multi-reaction tube plasma reactor according to claim 1, characterized in that: Each of the aforementioned intake pipes is equipped with a first flow valve, which is used to control the flow rate and speed of the corresponding single-pipe reaction branch.

5. The multi-reaction tube plasma reactor according to claim 1, characterized in that: A second flow valve is provided between the mixing tank and the multiple reaction pipes, and the multiple second flow valves are used to control the flow rate and speed of the corresponding reaction pipe.

6. The multi-reaction tube plasma reactor according to claim 1, characterized in that: The multi-reaction tube plasma reactor also includes an outer shell, on which the reactor inlet and the reactor outlet are located, and within which the gas inlet pipe, the gas mixing tank, and the reaction tube are located.

7. The multi-reaction tube plasma reactor according to claim 6, characterized in that: An insulating partition is provided inside the outer shell, which divides the inner cavity of the outer shell into a high-voltage discharge area and a gas pipeline area. The air inlet pipe and the gas mixing tank are both located in the gas pipeline area, and the reaction tube is located in the high-voltage discharge area. The high-voltage discharge area is also provided with a high-voltage power supply module that is electrically connected to the reaction tube.

8. The multi-reaction tube plasma reactor according to claim 7, characterized in that: The high-voltage discharge area is equipped with a cooling jacket and a cooling fan. The cooling jacket is connected to the reaction tube and / or the high-voltage power module. The cooling fan connects the high-voltage discharge area to the outside of the outer casing and is used to dissipate heat from the high-voltage discharge area.

9. A switching control method applicable to the multi-reaction tube plasma reactor according to any one of claims 1 to 8, characterized in that, include: The parallel valve control assembly is controlled to connect the inlet pipe to the reaction pipe and disconnect the mixing tank, and the series valve control element is controlled to connect the reaction pipe to the reactor outlet; This allows the multi-reaction tube plasma reactor to form a single-tube reaction structure, with multiple single-tube reaction branches working independently to treat different gases with plasma. The parallel valve control assembly is controlled to connect the gas inlet pipe to the gas mixing tank and the reaction tube in sequence, and the series valve control element is controlled to connect the reaction tube to the reactor outlet; thereby the multi-reaction tube plasma reactor forms a parallel reaction structure, and the reaction tubes of the multiple single-tube reaction branches are connected in parallel to each other, so as to evenly distribute and synchronously perform plasma treatment on the mixed gas in the gas mixing tank. One of the single-tube reaction branches is used as the inlet branch, and the remaining single-tube reaction branches are used as series branches. The parallel valve control assembly of the inlet branch is controlled to connect the inlet pipe to the reaction tube and disconnect the mixing tank, or to connect the inlet pipe to the mixing tank and the reaction tube in sequence. At the same time, the parallel valve control assembly of the series branches is controlled to disconnect the reaction tube from the inlet pipe and the mixing tank. Furthermore, the series valve control assembly is controlled to connect the reaction tubes of the inlet branch and the reaction tubes of the series branches end to end in sequence. Thus, the multi-reaction tube plasma reactor forms a series reaction structure, with multiple reaction tubes connected in series, and the gas to be treated flows through multiple reaction tubes in sequence for plasma treatment.

10. The switching control method according to claim 9, characterized in that: The number of intake branches is multiple, and the multiple intake branches and the corresponding series branches form multiple series reaction structures. The multiple series reaction structures are arranged in parallel with each other, so that the multi-reaction tube plasma reactor forms a series and parallel mixed reaction structure.

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