Membrane-method filtration decarburization device for biogas production

Abstract

The utility model provides a membrane filtration decarburization device for biogas production, which relates to the technical field of biogas production and comprises a reaction mechanism and a main body mechanism, the reaction mechanism comprises an oxidation tank, a cover plate is clamped at the top of the oxidation tank, a stirring shaft is inserted into the cover plate in a penetrating manner, a stirring paddle fixedly sleeves the outer surface wall of the stirring shaft, an agent inlet pipe, an oxygen inlet pipe and an air inlet pipe are fixedly communicated with the top of the cover plate, and a motor is fixedly mounted at the top of the cover plate. And the output end of the motor is fixedly connected with the top end of the stirring shaft. According to the device disclosed by the utility model, a catalyst is poured into the oxidation tank from the catalyst inlet pipe, biogas is introduced by utilizing the gas inlet pipe, oxygen is introduced by utilizing the oxygen inlet pipe, and the stirring paddle is driven to rotate by utilizing the motor, so that the catalytic oxidation efficiency is conveniently improved, hydrogen sulfide and volatile organic compounds in the biogas are removed, and metal parts in the device are prevented from being corroded; the separation performance of the membrane is influenced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the biogas production technical field especially biogas production membrane method filtration decarbonization device. BACKGROUND

[0002] The biogas production membrane method filtration decarbonization device is a professional equipment for removing impurities such as carbon dioxide (CO2) from biogas, improving the purity and quality of biogas. It is based on gas membrane separation technology, using the difference in permeation rate of different gases in the membrane material to separate methane (CH4) and carbon dioxide in biogas, so as to obtain high-purity methane gas, which can be used for power generation, heating, as automobile fuel and other purposes, improving the energy utilization value and economic value of biogas.

[0003] In the prior art, biogas contains hydrogen sulfide and volatile organic compounds. Hydrogen sulfide is an acidic gas with strong corrosive properties. In the membrane method filtration decarbonization device, it will react with the metal parts (such as pipelines, membrane assembly housings, etc.) in the device, thereby affecting the separation performance of the membrane. Volatile organic compounds are prone to cause membrane hole blockage, resulting in reduced membrane flux and affecting the decarbonization efficiency. UTILITY MODEL CONTENT

[0004] The utility model discloses a membrane method filtration decarbonization device for biogas production.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: including: reaction mechanism and main body mechanism, the reaction mechanism includes oxidation tank, the top of oxidation tank is connected with cover plate, the inside of cover plate is inserted and equipped with stirring shaft, the outer surface wall of stirring shaft is fixedly provided with stirring paddle, the top of cover plate is fixedly connected with agent inlet pipe, oxygen inlet pipe and air inlet pipe, the top of cover plate is fixedly installed motor, and the output end of motor is fixedly connected with the top end of stirring shaft.

[0006] Preferably, the main body mechanism includes a buffer tank, the bottom of the buffer tank is fixedly connected with a coarse particle filter, the bottom of the coarse particle filter is fixedly connected with an activated carbon filter, and the bottom of the activated carbon filter is fixedly connected with a connecting pipe.

[0007] Preferably, the outer surface wall of the buffer tank is fixedly connected with a compressor, and the output end of the compressor is fixedly connected with a fine particle filter.

[0008] The bottom of the fine particle filter is fixedly connected with a primary membrane, and the bottom of the primary membrane is fixedly connected with a secondary membrane.

[0009] The outer wall of the secondary membrane is respectively connected with an air outlet pipe and a detection box, and the inside of the detection box is fixedly installed with a gas sensor.

[0010] The top of the detection box is fixedly installed with a gas pump, the gas inlet end of the gas pump is fixedly connected with the top of the detection box, the gas outlet end of the gas pump is fixedly connected with a three-way pipe, and one end of the three-way pipe is fixedly connected with the outer wall of the buffer tank.

[0011] The main body mechanism is arranged on one side of the oxidation tank, and the connecting pipe is fixedly connected with the oxidation tank.

[0012] Compared with the prior art, the advantages and positive effects of the utility model are that,

[0013] 1、 in the utility model, the catalyst is poured into the inside of the oxidation tank from the agent inlet pipe, the biogas is introduced by the air inlet pipe, the oxygen is introduced by the oxygen inlet pipe, and the stirring paddle is driven to rotate by the motor, so that the catalytic oxidation efficiency is improved, the hydrogen sulfide and volatile organic compounds in the biogas are removed, the metal parts in the inside of the device are prevented from being corroded, and the separation performance of the membrane is affected.

[0014] 2、 in the utility model, the gas sensor is additionally arranged, the gas concentration after the secondary membrane separation is detected, the residual gas is classified and treated (next step or returned) according to the carbon dioxide concentration in the gas, the methane recovery rate of the system is improved, and the content of carbon dioxide is reduced. DRAWINGS

[0015] Figure 1 A perspective view of the membrane method filtering and decarburization device for biogas production is provided for the utility model;

[0016] Figure 2 A side view of the membrane method filtering and decarburization device for biogas production is provided for the utility model;

[0017] Figure 3 A split view of the reaction mechanism in the membrane method filtering and decarburization device for biogas production is provided for the utility model;

[0018] Figure 4 A perspective view of the main body mechanism in the membrane method filtering and decarburization device for biogas production is provided for the utility model.

[0019] Legend: 1. Reaction Mechanism; 101. Oxidation Tank; 102. Cover Plate; 103. Stirring Shaft; 104. Stirring Paddle; 105. Inlet Pipe; 106. Oxygen Inlet Pipe; 107. Gas Inlet Pipe; 108. Motor; 2. Main Mechanism; 201. Buffer Tank; 202. Coarse Particle Filter; 203. Activated Carbon Filter; 204. Connecting Pipe; 205. Compressor; 206. Fine Particle Filter; 207. Primary Membrane; 208. Secondary Membrane; 209. Gas Outlet Pipe; 210. Detection Box; 211. Gas Sensor; 212. Gas Pump; 213. T-Connector. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0022] Example 1: As Figures 1-4 As shown, this utility model provides a membrane filtration decarbonization device for biogas production, including: a reaction mechanism 1 and a main body mechanism 2; the reaction mechanism 1 includes an oxidation tank 101, the top of the oxidation tank 101 is snapped with a cover plate 102, a stirring shaft 103 is inserted through the inside of the cover plate 102, a stirring paddle 104 is fixedly sleeved on the outer wall of the stirring shaft 103, the top of the cover plate 102 is fixedly connected to an inlet pipe 105, an oxygen inlet pipe 106 and an air inlet pipe 107, a motor 108 is fixedly installed on the top of the cover plate 102, and the output end of the motor 108 is fixedly connected to the top end of the stirring shaft 103.

[0023] The overall effect of Embodiment 1 is as follows: by attaching a cover plate 102 to the top of the oxidation tank 101, the oxidation tank 101 is easily sealed. The top of the cover plate 102 is fixedly connected to the inlet pipe 105, the oxygen inlet pipe 106, and the air inlet pipe 107. The catalyst is poured into the interior of the oxidation tank 101 through the inlet pipe 105. Biogas is introduced through the air inlet pipe 107, and oxygen is introduced through the oxygen inlet pipe 106. A stirring shaft 103 is inserted through the interior of the cover plate 102. A stirring paddle 104 is fixedly sleeved on the outer wall of the stirring shaft 103. A motor 108 is fixedly installed on the top of the cover plate 102. The output end of the motor 108 is fixedly connected to the top end of the stirring shaft 103. The motor 108 drives the stirring paddle 104 to rotate, which improves the efficiency of catalytic oxidation and removes hydrogen sulfide and volatile organic compounds from the biogas.

[0024] Example 2: AsFigures 1-4 As shown, the main body mechanism 2 comprises a buffer tank 201, the bottom of the buffer tank 201 is fixedly connected with a coarse particle filter 202, the bottom of the coarse particle filter 202 is fixedly connected with an activated carbon filter 203, the bottom of the activated carbon filter 203 is fixedly connected with a connecting pipe 204; the outer wall of the buffer tank 201 is fixedly connected with a compressor 205, the output end of the compressor 205 is fixedly connected with a fine particle filter 206; the bottom of the fine particle filter 206 is fixedly connected with a primary membrane 207, the bottom of the primary membrane 207 is fixedly connected with a secondary membrane 208; the outer wall of the secondary membrane 208 is respectively connected with an air outlet pipe 209 and a detection box 210, the inside of the detection box 210 is fixedly installed with a gas sensor 211; the top of the detection box 210 is fixedly installed with a gas pump 212, the gas inlet end of the gas pump 212 is fixedly connected with the top of the detection box 210, the gas outlet end of the gas pump 212 is fixedly connected with a three-way pipe 213, one end of the three-way pipe 213 is fixedly connected with the outer wall of the buffer tank 201; the main body mechanism 2 is arranged on one side of the oxidation tank 101, and the connecting pipe 204 is fixedly connected with the oxidation tank 101.

[0025] The effect achieved by the whole embodiment 2 is that, by fixedly connecting the connecting pipe 204 with the bottom of the oxidation tank 101, the biogas enters the inside of the buffer tank 201 after being filtered by the activated carbon filter 203 and the coarse particle filter 202 in sequence through the connecting pipe 204, is pressurized to a preset pressure value by the compressor 205, and then enters the membrane assembly for decarburization after removing oil and dust by the fine particle filter 206; the pretreated biogas enters the primary membrane 207, the main component of the permeate gas of the primary membrane 207 is carbon dioxide, and the retentate gas is mostly methane; the primary retentate gas enters the secondary membrane 208 for separation, the retentate gas is product gas; finally, the air outlet pipe 209 and the detection box 210 are fixedly connected with the outer wall of the secondary membrane 208, the permeate gas of the secondary membrane 208 is discharged through the air outlet pipe 209, the retentate gas enters the inside of the detection box 210, and the gas concentration is detected by the gas sensor 211; when the concentration of carbon dioxide is lower than 3%, the product gas is compressed by natural gas to become CNG for vehicle fuel gas or is not compressed to become BNG for injection into a pipe network for sale, and the secondary permeate gas has a higher content of methane, which is extracted by the gas pump 212 and returned to the raw material gas buffer tank 201, thereby improving the methane recovery rate of the system.

[0026] Working principle: the device in use, first, by the top of the oxidation tank 101 clamping cover plate 102, facilitate sealing oxidation tank 101, in the top of the cover plate 102 fixedly connected with the agent pipe 105, oxygen pipe 106 and inlet pipe 107, the catalyst from the agent pipe 105 poured into the inside of the oxidation tank 101, using inlet pipe 107 introduced into the biogas, using the oxygen pipe 106 introduced into the oxygen, again in the inside of the cover plate 102 through the insertion of the stirring shaft 103, in the outer surface wall of the stirring shaft 103 fixedly sleeved with stirring paddle 104, the motor 108 is fixedly installed on the top of the cover plate 102, the output end of the motor 108 and the top end of the stirring shaft 103 are fixedly connected, the motor 108 is driven to rotate the stirring paddle 104, which can improve the efficiency of catalytic oxidation and remove hydrogen sulfide and volatile organic compounds in the biogas; second, the connecting pipe 204 is fixedly connected at the bottom of the oxidation tank 101, the biogas is filtered by the activated carbon filter 203, the coarse particle filter 202 in turn and then enters the inside of the buffer tank 201 through the connecting pipe 204, is pressurized to a preset pressure value by the compressor 205, and then enters the membrane module decarburization after removing oil and dust by the fine particle filter 206; the pretreated biogas enters the primary membrane 207, the primary membrane 207 penetrates the gas mainly composed of carbon dioxide, and the retentate gas is mostly methane; the primary retentate gas enters the secondary membrane 208 for separation, and the retentate gas is product gas; finally, the gas pipe 209 and the detection box 210 are fixedly connected on the outer surface wall of the secondary membrane 208, the permeate gas of the secondary membrane 208 is discharged from the gas pipe 209, the retentate gas enters the inside of the detection box 210, and the gas concentration is detected by the gas sensor 211; when the concentration of carbon dioxide is less than 3%, the product gas is compressed by natural gas to become CNG for vehicle fuel gas or is not compressed to become BNG for injection into the pipe network for sale; if the content of methane in the secondary permeate gas is high, the gas pump 212 is used to extract the gas back to the raw gas buffer tank 201, so that the methane recovery rate of the system is improved.

[0027] The wiring diagram of the motor 108, the gas sensor 211 and the gas pump 212 in the utility model belongs to the common knowledge in the field, and its working principle is a known technology, and the model is selected according to actual use, so the control mode and wiring arrangement of the motor 108, the gas sensor 211 and the gas pump 212 are not explained in detail.

[0028] The above is only a preferred embodiment of the utility model, and does not limit other forms of the utility model, and any skilled person in the art can change or modify the above disclosed technical content into equivalent embodiments applied to other fields, but any simple modification, equivalent change and modification made on the basis of the technical essence of the utility model to the above embodiments still belongs to the protection scope of the technical scheme of the utility model.

Claims

1. A membrane filtration and decarbonization device for biogas production, characterized in that, include: The reaction mechanism (1) and the main body mechanism (2); The reaction mechanism (1) includes an oxidation tank (101), with a cover plate (102) snapped onto the top of the oxidation tank (101). A stirring shaft (103) is inserted through the inside of the cover plate (102), and a stirring paddle (104) is fixedly fitted onto the outer wall of the stirring shaft (103). The top of the cover plate (102) is fixedly connected to an inlet pipe (105), an oxygen inlet pipe (106), and an air inlet pipe (107). A motor (108) is fixedly installed on the top of the cover plate (102), and the output end of the motor (108) is fixedly connected to the top end of the stirring shaft (103).

2. The membrane filtration decarbonization device for biogas production according to claim 1, characterized in that: The main body (2) includes a buffer tank (201), the bottom of which is fixedly connected to a coarse particle filter (202), the bottom of which is fixedly connected to an activated carbon filter (203), and the bottom of which is fixedly connected to a connecting pipe (204).

3. The membrane filtration decarbonization device for biogas production according to claim 2, characterized in that: The outer wall of the buffer tank (201) is fixedly connected to the compressor (205), and the output end of the compressor (205) is fixedly connected to the fine particle filter (206).

4. The membrane filtration decarbonization device for biogas production according to claim 3, characterized in that: The bottom of the fine particulate filter (206) is fixedly connected to the primary membrane (207), and the bottom of the primary membrane (207) is fixedly connected to the secondary membrane (208).

5. The membrane filtration decarbonization device for biogas production according to claim 4, characterized in that: The outer wall of the secondary membrane (208) is connected to the gas outlet pipe (209) and the detection box (210), respectively. The gas sensor (211) is fixedly installed inside the detection box (210).

6. The membrane filtration decarbonization device for biogas production according to claim 5, characterized in that: An air pump (212) is fixedly installed on the top of the test box (210). The air inlet of the air pump (212) is fixedly connected to the top of the test box (210). The air outlet of the air pump (212) is fixedly connected to a three-way pipe (213). One end of the three-way pipe (213) is fixedly connected to the outer wall of the buffer tank (201).

7. The membrane filtration decarbonization device for biogas production according to claim 2, characterized in that: The main body (2) is located on one side of the oxidation tank (101), and the connecting pipe (204) is fixedly connected to the oxidation tank (101).

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