Device for catalyzing methane dry reforming reaction by trapping carbon dioxide through plasma

Abstract

The utility model discloses a plasma trapping carbon dioxide catalytic methane dry reforming reaction device, which belongs to the technical field of methane treatment and comprises a reactor unit, a gas inlet unit, a gas separation unit and a synthesis gas collecting tank. The gas inlet unit is communicated with the reactor unit and is used for inputting biogas and carbon dioxide into the reactor unit; a reaction tank, a pulse generation mechanism and a heating structure are arranged in the reactor unit; a high-voltage electrode and a grounding electrode in the pulse generation mechanism are arranged in the reaction tank; the grounding electrode is arranged on the inner wall of the reaction tank; the high-voltage electrode is arranged in the quartz tube in the middle of the reaction tank; the high-voltage electrode is connected with a pulse power supply; a catalyst structure is arranged in the reaction tank; a gas separation unit is connected behind the reaction tank; a molecular sieve is arranged in the gas separation unit; the synthesis gas collecting tank is connected behind the gas separation unit and is used for collecting synthesis gas. The device disclosed by the utility model has the advantages of low-temperature efficient reforming and directional regulation and control of synthesis gas components.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the biogas treatment technical field, more specifically, it relates to a kind of plasma capture carbon dioxide catalytic biogas dry reforming reaction device. BACKGROUND

[0002] Traditional biogas (CH4 / CO2) dry reforming reaction needs to be operated at high temperature above 800℃, and there are problems such as catalyst carbon deposition deactivation, high energy consumption, and difficult to control H2 / CO product ratio. At the same time, the existing process needs to separate CO2 capture and reaction, which leads to complex equipment and increased energy consumption. Conventional plasma-assisted reforming can reduce the reaction temperature, but it has defects such as uneven electron energy distribution, poor reaction selectivity, and no integrated carbon capture function. Therefore, how to provide a kind of plasma capture carbon dioxide catalytic biogas dry reforming reaction device with high efficiency and low energy consumption is a problem that needs to be solved by the skilled in the art. SUMMARY

[0003] Therefore, the utility model provides a kind of plasma capture carbon dioxide catalytic biogas dry reforming reaction device, the utility model adopts the following technical scheme:

[0004] A kind of plasma capture carbon dioxide catalytic biogas dry reforming reaction device, comprising reactor unit, gas inlet unit, gas separation unit and synthesis gas collection tank;The gas inlet unit is communicated with the reactor unit by pipeline, for inputting biogas and carbon dioxide into the reactor unit;The reactor unit is internally provided with reaction tank, pulse generating mechanism and heating structure;The pulse generating mechanism includes high-voltage electrode, ground electrode and pulse power supply;The high-voltage electrode and the ground electrode are arranged in the reaction tank;The ground electrode is arranged on the inner wall of the reaction tank, and one end is grounded;The reaction tank middle part is provided with vertically arranged quartz tube;The high-voltage electrode is arranged in the quartz tube;The quartz tube and ground electrode are arranged as discharge gap;The high-voltage electrode is connected with the pulse power supply by high-voltage lead;The discharge gap in the reaction tank is provided with catalyst structure;The reaction tank rear is connected with the gas separation unit by pipeline, and the gas separation unit is provided with molecular sieve, for screening impurity gas in the synthesis gas after reaction;The gas separation unit rear is connected with synthesis gas collection tank by pipeline, for collecting synthesis gas.

[0005] Further, the gas inlet unit comprises a biogas tank, a carbon dioxide tank and a gas mixer; the biogas tank and the carbon dioxide tank are communicated with the gas mixer through pipelines; the gas mixer is communicated with the reaction tank through a pipeline; a first gas valve is arranged between the biogas tank and the gas mixer for controlling the biogas flow; a second gas valve and a flow meter are arranged between the carbon dioxide tank and the gas mixer for controlling the carbon dioxide tank flow and monitoring; a third gas valve is arranged between the gas mixer and the reaction tank for controlling the mixed gas flow.

[0006] Further, the high-voltage electrode is a spiral copper electrode and is fixed to the inner wall surface of the quartz tube.

[0007] Further, the reaction tank comprises a support partition plate and ceramic beads; the support partition plate is arranged between the discharge gaps and is used for supporting the ceramic beads; a plurality of pores are arranged on the support partition plate and are used for passing gas; and the ceramic beads are loaded with a reaction catalyst.

[0008] The utility model discloses the beneficial effect lies in:

[0009] The utility model provides a kind of plasma captures carbon dioxide catalytic biogas dry reforming reaction device, biogas flows through the discharge gap in reaction tank, is impacted by high-energy electron and is cracked into active free radical, ceramic bead surface is attached with reaction catalyst, assist the reaction of methane and carbon dioxide in biogas, and the dielectric property of ceramic bead prolongs electron residence time, improves ionization efficiency.Quartz tube formed dielectric barrier and ceramic bead jointly inhibit arc, ensure that discharge uniformity under continuous operation.The setting of carbon dioxide tank can increase the content of carbon dioxide in reaction tank, can improve the conversion rate of methane and carbon dioxide, promote reaction to proceed in positive direction, reduce the carbon deposition risk of intermediate product, can inhibit catalyst surface carbon deposition.And the flow of second gas valve can be controlled by the setting of flow meter adjustment carbon dioxide content, directional control H2 / CO ratio in synthesis gas after reaction.The plasma generation structure of the utility model can realize low-temperature efficient reforming, optimize catalyst activity and operating temperature, balance conversion rate and carbon deposition risk. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in embodiment or prior art description, obviously, the drawings in the following description are only embodiments of the utility model, and for those skilled in the art, other drawings can be obtained without creative labor on the premise of providing the drawings.

[0011] Figure 1 It is a structural schematic diagram of the utility model.

[0012] Wherein, the figure shows:

[0013] 1-biogas tank; 2-carbon dioxide tank; 3-first gas valve; 4-second gas valve; 5-flow meter; 6-gas mixer; 7-third gas valve; 8-heating structure; 9-high voltage electrode; 10-reaction tank; 11-ceramic beads; 12-supporting partition; 13-gas separation unit; 14-pulse power supply; 15-quartz tube; 16-ground electrode; 17-synthetic gas collection tank 17. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the utility model will be apparently and completely described in connection with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor fall within the protection scope of the utility model.

[0015] Please refer to the drawings Figure 1 The utility model provides a kind of plasma captures carbon dioxide catalytic biogas dry reforming reaction device, including reactor unit, gas inlet unit, gas separation unit 13 and synthetic gas collection tank 17;

[0016] The gas inlet unit is communicated with the reactor unit by pipeline, for inputting biogas and carbon dioxide into the reactor unit;The gas inlet unit includes biogas tank 1, carbon dioxide tank 2 and gas mixer 6;The biogas tank 1 and carbon dioxide tank 2 are communicated with the gas mixer 6 by pipeline respectively;The gas mixer 6 is communicated with the reaction tank 10 by pipeline;First gas valve 3 is arranged between the biogas tank 1 and the gas mixer 6, for controlling biogas flow;Second gas valve 4 and flow meter 5 are arranged between the carbon dioxide tank 2 and the gas mixer 6, for controlling carbon dioxide tank 2 flow and monitoring;Third gas valve 7 is arranged between the gas mixer 6 and the reaction tank 10, for controlling mixed gas flow.

[0017] The reactor unit is internally provided with a reaction tank 10, a pulse generating mechanism and a heating structure 8; the pulse generating mechanism comprises a high-voltage electrode 9, a grounding electrode 16 and a pulse power supply 14; the high-voltage electrode 9 and the grounding electrode 16 are arranged inside the reaction tank 10; the grounding electrode 16 is arranged on the inner wall of the reaction tank 10 and is grounded at one end; a quartz tube 15 is arranged in the middle of the reaction tank 10 and is arranged vertically, and is arranged as a dielectric barrier between the high-voltage electrode 9 and the grounding electrode 16; the high-voltage electrode 9 is arranged as a spiral copper electrode and is fixedly arranged on the inner wall surface of the quartz tube 15; a discharge gap is arranged between the quartz tube 15 and the grounding electrode 16; the high-voltage electrode 9 is connected to the pulse power supply through a high-voltage lead wire, can apply a high-frequency high-voltage electric field, and ionizes the gas in the discharge gap.

[0018] A catalyst structure is arranged in the discharge gap in the reaction tank 10 and comprises a support partition plate 12 and ceramic beads 11; the support partition plate 12 is arranged between the discharge gaps and is used for supporting the ceramic beads 11; a plurality of pores are arranged on the support partition plate 12 and are used for passing gas; and the ceramic beads 11 are loaded with a reaction catalyst on the surface. The heating structure 8 is arranged outside the reaction tank 10 and is used for providing the required temperature for the reaction tank 10. The reaction tank 10 is connected to a gas separation unit 13 through a pipeline at the back, the gas separation unit 13 is provided with molecular sieves and is used for screening out impurity gas in the synthesis gas after reaction. The gas separation unit 13 is connected to a synthesis gas collecting tank 17 through a pipeline at the back and is used for collecting synthesis gas.

[0019] In the utility model, the biogas enters the reaction tank 10 from the gas mixer 6 through the biogas tank 1, a radial electric field is formed between the high-voltage electrode 9 and the grounding electrode 16 in the reaction tank 10, the quartz tube 15 is arranged as a dielectric barrier to discharge, the discharge gap is filled with plasma, the gas flows through the discharge gap and is cracked into active free radicals under the impact of high-energy electrons, the ceramic beads 11 are attached with a reaction catalyst on the surface and assist the reaction of the methane and carbon dioxide in the biogas, the dielectric property of the ceramic beads prolongs the residence time of the electrons and improves the ionization efficiency. The dielectric barrier formed by the quartz tube 15 and the ceramic beads 11 together suppress the electric arc and ensure the uniformity of the discharge under continuous operation. The arrangement of the carbon dioxide tank 2 can increase the content of the carbon dioxide in the reaction tank 10, improve the conversion rate of the methane and carbon dioxide, promote the reaction to proceed in a positive direction, reduce the risk of carbon deposition of the intermediate product and inhibit the carbon deposition on the surface of the catalyst. And the arrangement of the flow meter 5 can adjust the flow of the second gas valve 4 to control the content of the carbon dioxide and directionally control the H2 / CO ratio in the synthesis gas after reaction.

[0020] The various embodiments described in this specification are presented by way of example, and each embodiment is presented for the purpose of conveying the novelty and inventive aspects of the present patent application. Each embodiment is presented in a progressive and explanatory manner, and each embodiment highlights differences from other embodiments. The same or similar parts and / or functions between embodiments are to be understood as mutual references among the embodiments.

[0021] The foregoing description of the disclosed embodiments enables a person skilled in the art to implement or use the present patent application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present patent application. Therefore, the present patent application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for dry reforming of biogas with carbon dioxide capture by plasma, characterized in that, The application relates to a biogas synthesis device, which comprises a reactor unit, an air inlet unit, a gas separation unit (13) and a synthesis gas collecting tank (17); the air inlet unit is communicated with the reactor unit through a pipeline and is used for inputting biogas and carbon dioxide into the reactor unit; the reactor unit is internally provided with a reaction tank (10), a pulse generating mechanism and a heating structure (8); the pulse generating mechanism comprises a high-voltage electrode (9), a grounding electrode (16) and a pulse power supply (14); the high-voltage electrode (9) and the grounding electrode (16) are arranged in the reaction tank (10); the grounding electrode (16) is arranged on the inner wall of the reaction tank (10) and is grounded at one end; a quartz tube (15) is vertically arranged in the middle of the reaction tank (10); the high-voltage electrode (9) is arranged in the quartz tube (15); a discharge gap is arranged between the quartz tube (15) and the grounding electrode (16); the high-voltage electrode (9) is connected with the pulse power supply through a high-voltage lead wire; a catalyst structure is arranged in the discharge gap in the reaction tank (10); the reaction tank (10) is connected with the gas separation unit (13) through a pipeline at the back; the gas separation unit (13) is provided with molecular sieves and is used for screening impurity gas in the synthesis gas after reaction; the gas separation unit (13) is connected with the synthesis gas collecting tank (17) through a pipeline at the back and is used for collecting the synthesis gas.

2. The device for dry reforming of biogas with carbon dioxide capture by plasma according to claim 1, characterized in that, The air inlet unit comprises a biogas tank (1), a carbon dioxide tank (2) and a gas mixer (6); the biogas tank (1) and the carbon dioxide tank (2) are respectively communicated with the gas mixer (6) through pipelines; the gas mixer (6) is communicated with the reaction tank (10) through a pipeline; a first gas valve (3) is arranged between the biogas tank (1) and the gas mixer (6) and is used for controlling the biogas flow; a second gas valve (4) and a flowmeter (5) are arranged between the carbon dioxide tank (2) and the gas mixer (6) and are used for controlling the carbon dioxide tank (2) flow and monitoring; a third gas valve (7) is arranged between the gas mixer (6) and the reaction tank (10) and is used for controlling the mixed gas flow.

3. The device for dry reforming of biogas with carbon dioxide capture by plasma according to claim 1, characterized in that, The high-voltage electrode (9) is arranged as a spiral copper electrode and is fixedly arranged on the inner wall surface of the quartz tube (15).

4. The device for dry reforming of biogas with carbon dioxide capture by plasma according to claim 1, characterized in that, The reaction tank (10) comprises a support partition plate (12) and ceramic beads (11); the support partition plate (12) is arranged between the discharge gaps and is used for supporting the ceramic beads (11); a plurality of pores are arranged on the support partition plate (12) and are used for passing gas; the ceramic beads (11) are loaded with a reaction catalyst on the surface.

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