A dielectric barrier discharge plasma particulate matter modification and gas purification device

Abstract

This invention discloses a dielectric barrier discharge plasma particulate matter modification and gas purification device, comprising a reactor, a particulate matter filter, a membrane gas separator, a flow meter, and a ball valve. The reactant gas enters a hollow electrode tube and mixes with the particulate matter through an opening. The working gas enters a buffer chamber and is fluidized into the particulate matter through a perforated plate. Charge enters the hollow electrode tube through a metal cap and forms a dielectric barrier discharge region with the grounding electrode outside the reactor. High-energy electrons reach the surface of the particulate matter and form a stable plasma sheath layer on the surface. The atomic bonds of the reactant gas break, forming small fragment groups and atoms. After treatment in the particulate matter filter, the particulate matter returns to the reactor. The post-reaction mixed gas enters the membrane gas separator, which separates different gases. The working gas is returned to the buffer chamber via the flow meter and ball valve for gas recycling. The post-reaction gas is collected via the ball valve.

Description

Technical Field

[0001] This invention relates to the field of particulate matter modification and gas purification technology, and in particular to a dielectric barrier discharge plasma particulate matter modification and gas purification device. Background Technology

[0002] Dielectric barrier discharge plasma (DPDP) for particulate matter modification utilizes high-energy electrons in the plasma to form a stable plasma sheath on the particulate surface. The reactant gas, stimulated by collisions with these high-energy electrons, undergoes atomic bond breakage, forming small fragment groups and atoms. Electrons, ions, and active groups in the reactor then engage in physicochemical reactions with the particulate matter, modulating the surface function of the particulate matter at the atomic and molecular scale. However, current DPDP methods for particulate matter modification or gas treatment suffer from problems such as uneven mixing of reactant gas and particulate matter, low modification efficiency, and waste of reactant gas. On one hand, current DPDP methods for particulate matter modification employ direct filling, resulting in uneven mixing of the inner layer of particles and insufficient modification energy. On the other hand, the direct discharge of unreacted gases leads to waste of reactant gas. Summary of the Invention

[0003] The purpose of this invention is to provide a dielectric barrier discharge plasma particulate matter modification and gas purification device to solve the problems existing in the prior art. By using a working gas to fluidize the particulate matter, the reaction process is more uniformly mixed, further improving the reaction efficiency. When a reducing gas is introduced through the hollow electrode tube, particulate matter modification can be achieved under the action of the reducing gas and plasma; when odorous gas is introduced through the hollow electrode tube, gas purification is achieved under the action of particulate matter and plasma. An incompletely reacted particulate matter is collected and returned to the reaction tube using a particulate matter separator, achieving complete particulate matter modification. Furthermore, a membrane gas separator uses a high-quality carbon molecular sieve to separate the working gas from the reaction gas and return it to the reaction tube, achieving gas recycling and reducing experimental waste.

[0004] To achieve the above objectives, the present invention provides the following solution: The present invention provides a dielectric barrier discharge plasma particulate matter modification and gas purification device, comprising:

[0005] A reactor, comprising a discharge electrode, a reactor body, a grounding electrode, a buffer chamber, a high-voltage electrode, and a hollow electrode tube, wherein particulate matter is contained within the reactor body, one end of the hollow electrode tube is located within the reactor body, and the other end extends out of the reactor body and is connected to a three-way valve for the reaction gas; a metal cap and a discharge electrode are installed on the extended end of the hollow electrode tube; openings are arranged on the hollow electrode tube located within the reactor body; a perforated plate is provided at the lower part of the reactor body, and the buffer chamber is located at the bottom of the perforated plate within the reactor body, the bottom of which is connected to the three-way valve for the working gas; a grounding electrode and a high-voltage electrode are provided on the outer side of the reactor body; and

[0006] A particulate filter, wherein the upper air outlet of the reactor body is connected to the particulate filter, and the bottom of the particulate filter is connected to the return port of the reactor body via a pipeline; and

[0007] A membrane gas separator, wherein the outlet of the particulate filter is connected to the membrane gas separator; the outlet of the membrane gas separator after the reaction is connected to the three-way valve for the reaction gas; and

[0008] The working gas outlet of the membrane gas separator is connected to the flow meter, and the working gas returns to the buffer chamber through the flow meter and the control of the ball valve.

[0009] Preferably, one end of the hollow electrode tube is located inside the reactor body and is disposed on top of the perforated plate.

[0010] Preferably, the perforated plate has evenly distributed openings with a diameter of 10-100 mesh; the hollow electrode tube has openings with a diameter of 10-100 mesh, and the hollow electrode tube has 3-5 rows of openings.

[0011] Preferably, the particulate filter includes a filter body, a valve, and an n-shaped pipeline. The upper air outlet of the reactor body is connected to the air inlet of the filter body, and the bottom of the filter body is connected to the return port of the reactor body through the n-shaped pipeline. The valve is installed at the inlet section of the n-shaped pipeline.

[0012] Preferably, the membrane gas separator includes a housing and a hollow fiber separation membrane, the hollow fiber separation membrane being disposed inside the housing, and the housing having a post-reaction gas outlet and a working gas outlet.

[0013] Preferably, a carbon molecular sieve is arranged in the hollow fiber separation membrane.

[0014] Preferably, the gas outlet after reaction is located at the top of the housing, and the working gas outlet is located at the tail of the housing.

[0015] The present invention achieves the following beneficial technical effects compared to the prior art:

[0016] This invention relates to a dielectric barrier discharge plasma particulate matter modification and gas purification device, belonging to the fields of particulate matter modification, odor gas treatment, and waste gas treatment technology. It provides a device for particulate matter modification and gas purification, comprising a reactor, a particulate filter, a membrane gas separator, a flow meter, and a ball valve. The reaction gas enters the hollow electrode tube from the left end of the three-way valve and mixes with the particulate matter at the outlet. The working gas enters the buffer chamber from the lower three-way valve and is passed into the particulate matter through a perforated plate, fluidizing the particulate matter. After energization, the charge enters the hollow electrode tube through the metal cap and forms a dielectric barrier discharge region with the grounding electrode outside the reactor. During particulate matter modification, high-energy electrons reach the surface of the particulate matter and form a stable plasma sheath layer. During gas purification, odorous gases are excited by collisions with high-energy electrons, breaking atomic bonds to form small fragment groups and atoms. The gas produced by the reaction is connected to the particulate filter from the upper outlet. After treatment, the particulate matter returns to the reactor through an n-type pipeline, and the gas enters the membrane gas separator through the outlet. The membrane gas separator separates the working gas from the reaction gas. After the reaction, the gas is collected by the control of the ball valve, and the working gas is returned to the buffer chamber by the control of the flow meter and the ball valve to achieve gas recycling. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the dielectric barrier discharge plasma particulate matter modification and gas purification device in an embodiment of the present invention.

[0019] The components include: 1. Reactor; 1-1. Three-way valve for reaction gas; 1-2. Metal cap; 1-3. Discharge electrode; 1-4. Reactor body; 1-5. Grounding electrode; 1-6. Perforated plate; 1-7. Buffer chamber; 1-8. Three-way valve for working gas; 1-9. High-pressure electrode; 1-10. Hollow electrode tube; 2. Particulate filter; 2-1. Filter body; 2-2. Valve; 2-3. N-type pipeline; 3. Membrane gas separator; 3-1. Shell; 3-2. Hollow fiber separation membrane; 4. Flow meter; 5. Ball valve. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The purpose of this invention is to provide a dielectric barrier discharge plasma particulate matter modification and gas purification device to solve the problems existing in the prior art. When a reducing gas is introduced through the hollow electrode tube, the reactor achieves particulate matter modification under the action of the reducing gas and plasma; when an odorous gas is introduced through the hollow electrode tube, the gas is purified under the action of particulate matter and plasma. Furthermore, by using the working gas to fluidize the particulate matter, the reaction process is mixed more uniformly, further improving the reaction efficiency. Simultaneously, a particulate matter separator collects unreacted particulate matter and returns it to the reaction tube, achieving complete particulate matter modification. A membrane gas separation device uses a high-quality carbon molecular sieve to separate the working gas from the reaction gas and return it to the reaction tube, achieving gas recycling and reducing experimental waste.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1 As shown, the present invention provides a device for modifying particulate matter and purifying gas using dielectric barrier discharge plasma, comprising:

[0024] Reactor 1 includes a discharge electrode 1-3, a reactor body 1-4, a grounding electrode 1-5, a buffer chamber 1-7, a high-voltage electrode 1-9, and a hollow electrode tube 1-10. Particulate matter is contained within the reactor body 1-4. One end of the hollow electrode tube 1-10 is located within the reactor body 1-4, and the other end extends out of the reactor body 1-4 and is connected to a three-way valve 1-1 for the reaction gas. A metal cap 1-2 and the discharge electrode 1-3 are installed on the extended end of the hollow electrode tube 1-10. The hollow electrode tube 1-10 within the reactor body 1-4 has openings. A perforated plate 1-6 is located at the lower part of the reactor body 1-4. The buffer chamber 1-7 is located at the bottom of the perforated plate 1-6 within the reactor body 1-4, and its bottom is connected to a three-way valve 1-8 for the working gas. The grounding electrode 1-5 and the high-voltage electrode 1-9 are located on the outer side of the reactor body 1-4.

[0025] Particulate filter 2 is connected to the upper air outlet of reactor body 1-4, and the bottom of particulate filter 2 is connected to the return port of reactor body 1-4 via a pipeline; and

[0026] The outlet of the membrane gas separator 3 and the particulate filter 2 are connected to the membrane gas separator 3; the outlet of the post-reaction gas of the membrane gas separator 3 is connected to the three-way valve 1-1 for the reaction gas; and

[0027] The working gas outlet of the flow meter 4 and the membrane gas separator 3 is connected to the flow meter 4. The outlet of the flow meter 4 is connected to the inlet of the ball valve 5 through a pipeline. The outlet of the ball valve 5 is connected to the right port of the working gas three-way valve 1-8 through a pipeline. The working gas returns to the buffer chamber 1-7 through the regulation of the flow meter 4 and the ball valve 5.

[0028] Specifically, the bottom of the reactor body 1-4 is provided with a buffer chamber 1-7 and a perforated plate 1-6, and a hollow electrode tube 1-10 is provided inside. The hollow electrode tube 1-10 can conduct electricity through the metal cap 1-2. The hollow electrode tube 1-10 is provided with micropores to allow the reaction gas to pass through. The membrane gas separator 3 is provided with a hollow fiber separation membrane 3-2 and a high-quality carbon molecular sieve, which realizes the separation of working gas and reaction gas according to the adsorption principle.

[0029] In one embodiment, the perforated plate 1-6 is provided with equidistantly distributed small holes, preferably with a diameter of 10-100 mesh, to facilitate the introduction of gas into the buffer chamber 1-7 and prevent particulate matter leakage. The hollow electrode tube 1-10 is provided with equidistantly arranged micropores to facilitate the permeation of reaction gas, preferably with a diameter of 10-100 mesh, and preferably in 3-5 rows.

[0030] In one embodiment, the particulate filter 2 includes a filter body 2-1, a valve 2-2, and an n-type pipe 2-3. The upper outlet of the reactor body 1-4 is connected to the inlet of the filter body 2-1, and the bottom of the filter body 2-1 is connected to the return port of the reactor body 1-4 through the n-type pipe 2-3. The inlet section of the n-type pipe 2-3 is equipped with a valve 2-2. The particulate filter 2 can separate particulate matter from the gas after the reaction. The particulate matter enters the return port of the reactor 1 through the n-type pipe 2-3.

[0031] In one embodiment, the membrane gas separator 3 includes a housing 3-1 and a hollow fiber separation membrane 3-2, the hollow fiber separation membrane 3-2 being disposed inside the housing 3-1, and the housing 3-1 having a post-reaction gas outlet and a working gas outlet.

[0032] In one embodiment, a high-quality carbon molecular sieve is arranged in the hollow fiber separation membrane 3-2 of the membrane gas separator 3. Due to its different permeability and permeation rate for gases of different molecular weights, it can achieve enrichment in the gas phase and adsorption phase, thereby realizing the separation of the reaction gas and the working gas. The reaction gas outlet is arranged at the top of the shell 3-1, and the working gas outlet is arranged at the tail of the shell 3-1.

[0033] In one embodiment, the reaction gas and working gas are selected according to the needs of the particulate matter modification experiment. The working gas connected at the working gas three-way valve 1-8 is preferably nitrogen. The reaction gas connected at the reaction gas three-way valve 1-1 is preferably ammonia, hydrogen, odorous gas or volatile organic gas. The particulate matter in the reactor body 1-4 is preferably Ni-Cu / Al2O3, Fe / Al2O3 and Cu / Al2O3, and the particle size is preferably 20-120 mesh.

[0034] In one embodiment, the reactant gas and working gas are selected according to the needs of the gas purification experiment. The working gas connected to the three-way valves 1-8 is preferably nitrogen; the reactant gas connected to the three-way valve 1-1 is preferably ammonia, odorous gas, or volatile organic compound gas, with a concentration of 200 ppm and a flow rate of 10000 m³ / h. 3 / h; the particulate matter in the reactor body 1-4 is preferably Ni-Cu / Al2O3, Fe / Al2O3 and Cu / Al2O3, and the particle size is preferably 20-120 mesh.

[0035] The working process of the dielectric barrier discharge plasma particulate matter modification and gas purification device of the present invention is as follows:

[0036] The reactant gas enters the hollow electrode tube 1-10 from the left end of the reactant gas three-way valve 1-1. The hollow electrode tube 1-10 has micropores, allowing the gas to mix with the particulate matter through the pores. The working gas enters the buffer chamber 1-7 from the lower working gas three-way valve 1-8 and is then introduced into the particulate matter through the perforated plate 1-6 to fluidize the particulate matter. When the reducing gas is introduced into the hollow electrode tube, after energization, the charge enters the hollow electrode tube 1-10 through the metal cap 1-2. A dielectric barrier discharge region is formed between the hollow electrode tube 1-10, the high-voltage electrode 1-9 plate, and the grounding electrode 1-5, generating electrons, ions, and active groups. These particles interact with the particulate matter at the atomic and molecular scale, regulating the surface function of the particulate matter and achieving particulate matter modification. When odorous gas is introduced into the hollow electrode tube, after electrolysis, the charge enters the hollow electrode tube 1-10 through the metal cap 1-2. A dielectric barrier discharge region is formed between the hollow electrode tube 1-10, the high-voltage electrode 1-9 plate, and the grounding electrode 1-5. High-energy particles promote the decomposition and recombination of the odorous gas, and particulate matter promotes the reaction. The gas produced by the reaction is connected to the particulate matter filter 2 through the upper outlet. After treatment, the particulate matter returns to the reactor 1 through the n-type pipeline 2-3, and the gas enters the membrane gas separator 3 through the outlet. In the membrane gas separator 3, due to the different diffusion rates of the reactant gas and the working gas on the molecular sieve surface, enrichment is achieved in the adsorption phase and the gas phase respectively in a short time according to the difference in adsorption, thereby achieving the separation of the working gas and the reactant gas. The reactant gas is then collected through the upper outlet, and the working gas is returned to the buffer chamber 1-7 through the regulation of the flow meter 4 and the ball valve 5 to achieve gas recycling.

[0037] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A device for modifying particulate matter and purifying gas using dielectric barrier discharge plasma, characterized in that, include: A reactor, comprising a discharge electrode, a reactor body, a grounding electrode, a buffer chamber, a high-voltage electrode, and a hollow electrode tube, wherein particulate matter is contained within the reactor body, one end of the hollow electrode tube is located within the reactor body, and the other end extends out of the reactor body and is connected to a three-way valve for the reaction gas; a metal cap and a discharge electrode are installed on the extended end of the hollow electrode tube; openings are arranged on the hollow electrode tube located within the reactor body, and a perforated plate is provided at the lower part of the reactor body, with the buffer chamber located at the bottom of the perforated plate within the reactor body, the bottom of which is connected to the three-way valve for the working gas; a grounding electrode and a high-voltage electrode are provided on the outer side of the reactor body; one end of the hollow electrode tube is located within the reactor body and positioned at the top of the perforated plate; as well as A particulate filter, wherein the upper air outlet of the reactor body is connected to the particulate filter, and the bottom of the particulate filter is connected to the return port of the reactor body via a pipeline; and A membrane gas separator, wherein the outlet of the particulate filter is connected to the membrane gas separator; the outlet of the membrane gas separator after the reaction is connected to the three-way valve for the reaction gas; and The working gas outlet of the membrane gas separator is connected to the flow meter, and the working gas returns to the buffer chamber through the flow meter and the control of the ball valve.

2. The dielectric barrier discharge plasma particulate matter modification and gas purification device according to claim 1, characterized in that: The perforated plate has holes evenly distributed, with a hole diameter of 10-100 mesh; the hollow electrode tube has holes with a hole diameter of 10-100 mesh, and the hollow electrode tube has 3-5 rows of holes.

3. The dielectric barrier discharge plasma particulate matter modification and gas purification device according to claim 1, characterized in that: The particulate filter includes a filter body, a valve, and an n-shaped pipeline. The upper air outlet of the reactor body is connected to the air inlet of the filter body, and the bottom of the filter body is connected to the return port of the reactor body through the n-shaped pipeline. The valve is installed at the inlet section of the n-shaped pipeline.

4. The dielectric barrier discharge plasma particulate matter modification and gas purification device according to claim 1, characterized in that: The membrane gas separator includes a housing and a hollow fiber separation membrane. The hollow fiber separation membrane is disposed inside the housing. The housing has a post-reaction gas outlet and a working gas outlet.

5. The dielectric barrier discharge plasma particulate matter modification and gas purification device according to claim 4, characterized in that: The hollow fiber separation membrane contains carbon molecular sieves.

6. The dielectric barrier discharge plasma particulate matter modification and gas purification device according to claim 4, characterized in that: The gas outlet after the reaction is located at the top of the shell, and the working gas outlet is located at the tail of the shell.

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