Methane removal device

Abstract

The present invention provides a methane removal device comprising: a housing provided with a suction port and a discharge port; an adsorption part which is provided inside the housing and supports BEA-type zeolite containing cobalt that has been subjected to ion exchange; and an ozone supply device for supplying ozone between the suction inlet and the adsorption unit.

Description

Technical Field

[0001] The present disclosure relates to a device for removing methane from gas. Background Art

[0002] Methane is included in the exhaust gas from automobiles, various plants, agricultural and livestock facilities, waste disposal sites, sewage treatment plants, etc. Methane is a type of greenhouse gas, with a global warming potential (GWP) of 25 for carbon dioxide, which is 1.

[0003] Exhaust gas containing high concentrations of methane is treated by combustion of methane itself or combustion with added fuel, but exhaust gas containing low concentrations of methane is sometimes discharged in an untreated state. In addition, methane produced by anaerobic fermentation of ruminant burps or excrement in agricultural and livestock facilities is basically discharged in an untreated state. Summary of the invention

[0004] Problem that the invention aims to solve

[0005] As a countermeasure to global warming, it is required to reduce various greenhouse gases, and methane is also expected to be removed from various exhaust gases. However, at present, the technology for effectively decomposing and removing methane from exhaust gases has not been put into practical use.

[0006] An object of the present disclosure is to provide a methane removal apparatus that effectively removes methane from various exhaust gases and the like.

[0007] Solutions to the problem

[0008] The methane removal device of the present disclosure comprises: a housing provided with a suction port and a discharge port; an adsorption unit provided in the housing and carrying BEA type zeolite containing ion-exchanged cobalt; and an ozone supply device for supplying ozone between the suction port and the adsorption unit.

[0009] Effects of the Invention

[0010] According to the methane removal device disclosed herein, methane can be effectively decomposed by the catalytic action of the adsorption unit. In addition, since methane is adsorbed to the adsorption unit and decomposed by ozone, the contact opportunity between methane and ozone increases, and methane can be effectively decomposed and removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a diagram showing the main parts of the methane removal device.

[0012] Figure 2 It is a diagram showing the entirety of the methane removal device.

[0013] Figure 3 It is a diagram showing a modified example of the methane removal device.

[0014] Description of Reference Numerals

[0015] 1: Ozone supply device;

[0016] 2: Particle capture unit;

[0017] 3: adsorption part;

[0018] 4: Ozone decomposition unit;

[0019] 11: Inhalation chamber;

[0020] 12: Suction port;

[0021] 13: Fan;

[0022] 14: Oxidation chamber;

[0023] 15: discharge port;

[0024] 16: connecting pipe;

[0025] 50: housing;

[0026] 100: Methane removal unit. DETAILED DESCRIPTION

[0027] Hereinafter, the methane removal device of the embodiment of the present disclosure will be specifically described with reference to the accompanying drawings. It should be noted that the embodiments described below are all comprehensive or specific examples. In addition, each figure is a schematic diagram and is not necessarily a strictly illustrated figure. Furthermore, in each figure, the same figure mark is marked for substantially the same components, and repeated descriptions are sometimes omitted or simplified.

[0028] Figure 1 The main parts of the methane removal device 100 of the present disclosure are schematically shown. The gas to be processed flows from left to right through the methane removal device 100 along the arrows in the figure and is processed.

[0029] Reference numeral 1 is an ozone supply device for supplying ozone to the gas to be processed. The type of the ozone supply device 1 is not limited, and may be a silent discharge type, an ultraviolet lamp type, an electrolysis type, etc. The generated ozone is mixed with the gas to be processed and flows.

[0030] 2 is a particle capture unit that captures fine particles in the gas to be processed and further adsorbs and decomposes and removes unnecessary components other than methane. Examples of unnecessary components include fine particles such as ammonia, hydrogen sulfide, siloxane, volatile organic compounds (VOC), soot, etc.

[0031] The raw material of the particle capture unit 2 is preferably a material that is not degraded by ozone, and a filter such as a mesh or a porous body is formed using glass fiber or ceramic as the raw material. In addition, it is preferred that a zeolite such as BEA type, MOR type, FER type, MFI type, FAU type, CHA type, LTA type, etc. is supported on the filter as a catalyst for decomposing unnecessary components using ozone, and BEA type zeolite is particularly preferred from the perspective of economy and catalytic function.

[0032] 3 is an adsorption part for adsorbing, decomposing and removing methane in the treated gas. The adsorption part 3 is made of a material that is not degraded by ozone, such as glass fiber or ceramic, and is formed into a shape such as a honeycomb, corrugated, mesh, porous body, diamond net, etc. to make a carrier. Preferably, the adsorption part 3 is an adsorption part in which a zeolite such as BEA type, MOR type, FER type, MFI type, FAU type, CHA type, LTA type, etc. is supported on the carrier.

[0033] The zeolite in the adsorption section 3 is preferably a zeolite that has undergone ion exchange with metals such as Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Nb, Mo, Sn, lanthanide elements, Ta, W, and Bi. BEA-type zeolite that has undergone ion exchange with Co is particularly preferred because it can most effectively decompose methane.

[0034] Reference numeral 4 denotes an ozone decomposition unit for decomposing ozone in the treated gas. The ozone decomposition unit 4 decomposes ozone remaining in the treated gas after methane and the like have been decomposed and removed. The material thereof is not limited, and activated carbon, alumina compounds, manganese catalysts, etc. may be used.

[0035] Figure 2 The overall structure of the methane removal device 100 of the present disclosure is schematically shown. The treated gas flows from left to right along the arrows in the figure through the methane removal device 100 for treatment. The housing 50 of the methane removal device 100 includes: a suction chamber 11 having a suction port 12 for the treated gas to flow in; an oxidation chamber 14 having a discharge port 15 for discharging the treated gas; and a connecting pipe 16 connecting the suction chamber 11 and the oxidation chamber 14.

[0036] A fan 13 for sucking the treated gas from the suction port 12 is provided inside the suction chamber 11. An ozone supply device 1 is provided inside the connecting pipe 16 to supply ozone to the inside of the connecting pipe 16. Inside the oxidation chamber 14, a particle capture unit 2, an adsorption unit 3, and an ozone decomposition unit 4 are provided in order from the upstream side to the downstream side of the flow of the treated gas.

[0037] Next, the operation of the methane removal device 100 will be described. When the fan 13 is rotated, the gas to be treated containing methane is sucked into the suction chamber 11 from the suction port 12 and is transported to the connecting pipe 16. When the ozone supply device 1 in the connecting pipe 16 is driven, ozone is generated in the connecting pipe 16, and the gas to be treated and the ozone are mixed.

[0038] The treated gas containing ozone is transported to the oxidation chamber 14 and contacts the particle capture section 2. In the particle capture section 2, the microparticles in the treated gas are captured and separated. In addition, through the catalytic action of the BEA type zeolite and the like in the particle capture section 2, the ammonia, hydrogen sulfide, siloxane, volatile organic compounds (VOC) and other unnecessary components in the treated gas are decomposed and treated by ozone. As a result, microparticles or unnecessary components will not reach the downstream adsorption section 3, and there is no need to worry about hindering the decomposition reaction of methane in the adsorption section 3.

[0039] Next, when the treated gas from which particles and unnecessary components have been separated and removed contacts the adsorption unit 3, methane is adsorbed by the BEA zeolite in which cobalt ions have been exchanged. Then, methane is decomposed by ozone according to the following formula by the catalytic action of the BEA zeolite.

[0040] CH 4 +4O 3 →CO 2 +2H 2 O+4O 2

[0041] Since methane is adsorbed by the adsorption unit 3 , the chance of contact with ozone increases. Furthermore, since the adsorption unit 3 includes the BEA type zeolite in which Co has been ion-exchanged, the decomposition of methane is promoted by the catalytic action of the adsorption unit 3 .

[0042] The ozone remaining in the adsorption unit 3 without being used to decompose methane is decomposed into oxygen in the ozone decomposition unit 4. The treated gas from which methane and other impurities are decomposed and removed is discharged from the discharge port 15.

[0043] Figure 3 1 shows a modified example of the methane removal device 100. In this example, the ozone supply device 1 is provided outside the connecting pipe 16 instead of being provided inside the connecting pipe 16, and ozone is supplied from outside the connecting pipe 16. By adopting this structure, the flow of the gas to be treated in the connecting pipe 16 becomes smooth. In addition, the form and size of the ozone supply device 1 are not limited by the diameter of the connecting pipe 16, etc.

[0044] In the above-described embodiment and modified examples, the fan 13 is provided upstream of the ozone supply device 1 or the adsorption unit 3 , but the fan 13 may be provided between the ozone supply device 1 and the adsorption unit 3 or downstream of the adsorption unit 3 .

[0045] Furthermore, in the above-described embodiment and modified examples, the fan 13 is provided in the casing 50 of the methane removal apparatus 100 . However, the methane removal apparatus 100 may be configured to pressurize and transport the gas to be processed from the outside of the methane removal apparatus 100 into the methane removal apparatus 100 .

[0046] The above-described embodiments and modifications may be adopted in any combination.

[0047] Industrial Applicability

[0048] It can effectively decompose and remove methane and reduce greenhouse gases.

Claims

1. A methane removal device, characterized in that: have: A shell body provided with a suction port and a discharge port; an adsorption unit provided in the housing and carrying a BEA-type zeolite containing ion-exchanged cobalt; and The ozone supply device supplies ozone between the suction port and the adsorption unit.

2. The methane removal device according to claim 1, wherein: A fan is disposed in the housing to suck in the processed gas from the suction port and discharge the processed gas from the discharge port.

3. The methane removal device according to claim 1, wherein: The ozone supply device is disposed inside the housing.

4. The methane removal device according to claim 1, wherein: The ozone supply device is disposed outside the housing.

5. The methane removal device according to claim 1, wherein: An ozone decomposition unit is provided between the adsorption unit and the discharge port.

6. The methane removal device according to claim 1, wherein: A particle capturing unit for capturing fine particles contained in the gas to be processed is provided between the ozone supply device and the adsorption unit.

7. The methane removal device according to claim 6, wherein: The particle capturing portion includes zeolite.

8. The methane removal device according to claim 7, wherein: The zeolite is of BEA type.

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