Reactor for carrying out biological carbon sequestration on biogas

Abstract

The utility model discloses a reactor for carrying out biological carbon sequestration on biogas, which comprises an anaerobic reactor, a biological carbon sequestration reactor and a hydrogen storage tank, the top of the anaerobic reactor is connected with a coarse biogas pipe, the coarse biogas pipe is connected with a biogas purification device, a carbon dioxide releaser and a hydrogen releaser are arranged in the biological carbon sequestration reactor, and the hydrogen storage tank is connected with a hydrogen storage tank. And the carbon dioxide releaser is connected with a purified biogas pipe. According to the reactor for biological carbon sequestration of the biogas, carbon dioxide is immobilized by adopting a biological method, so that the energy consumption is low, chemical agents do not need to be added, and the operation cost is low; carbon dioxide immobilized by microorganisms is converted into acetic acid at the same time, emission of greenhouse gas is reduced, and meanwhile the product can be used as a chemical product; after purification by a biological method, the content of methane can reach 97% or above, and the natural gas standard is reached; hydrogen and carbon dioxide are diffused into the reactor by adopting a bubble-free film, so that the mass transfer efficiency is high, and the reaction is more thorough.

Description

Technical Field

[0001] The utility model relates to the field of waste liquid treatment and regeneration, in particular to a reactor for biological carbon fixation of biogas. Background Art

[0002] The reactor for biological carbon fixation of biogas is a supporting equipment for waste liquid treatment and regeneration. The biogas produced by anaerobic fermentation of organic waste liquid and solid waste is a renewable energy source. Its main components are about 40% carbon dioxide and about 60% methane, with a calorific value of 5000~5500Kcal / Nm³. Compared with natural gas, the energy density of biogas is not high, and the energy quality and utilization value are relatively low. Therefore, it is necessary to remove about 40% of the carbon dioxide in the biogas to improve the energy density and energy quality. With the continuous development of science and technology, people have higher and higher requirements for the manufacturing process of reactors for biological carbon fixation of biogas.

[0003] Existing reactors for biological carbon fixation of biogas have certain drawbacks when used. First, the methods for removing carbon dioxide from biogas mainly include physical and chemical methods such as pressure swing adsorption, pressurized water washing, chemical absorption, and membrane separation. These methods have high energy consumption, require the consumption of chemical reagents, and produce secondary pollution. The removed carbon dioxide is not effectively utilized, which is not conducive to people's use. In addition, there is also a chemical synthesis method that introduces a certain amount of hydrogen into the biogas, which is directly called methane. The temperature and pressure required for the synthesis process of this method are high, the energy consumed is large, the parameter control requirements are strict, the operation is relatively complicated, and the equipment investment is high, which brings certain adverse effects to the actual use process. For this reason, we propose a reactor for biological carbon fixation of biogas. Utility Model Content

[0004] Technical problems solved: In view of the shortcomings of the prior art, the utility model provides a reactor for biological carbon fixation of biogas, which uses biological methods to fix carbon dioxide, has low energy consumption, does not require the addition of chemical agents, and has low operating costs; the carbon dioxide fixed by microorganisms is simultaneously converted into acetic acid, reducing greenhouse gas emissions, and the product can be used as a chemical product; after purification by biological methods, the methane content can reach more than 97%, meeting the natural gas standard; a bubble-free membrane is used to diffuse hydrogen and carbon dioxide into the reactor, with high mass transfer efficiency and a more thorough reaction, which can effectively solve the problems in the background technology.

[0005] Technical solution: To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a reactor for biological carbon fixation of biogas, comprising an anaerobic reactor, a biological carbon fixation reactor and a hydrogen storage tank, the top of the anaerobic reactor is connected with a rough biogas pipe, the rough biogas pipe is connected with a biogas purification device, a carbon dioxide releaser and a hydrogen releaser are arranged inside the biological carbon fixation reactor, the carbon dioxide releaser is connected with a purified biogas pipe, the hydrogen releaser is connected with a hydrogen pipe, the biological carbon fixation reactor is connected with a methane online monitor, a carbon dioxide online monitor, a purified biogas pipe, a hydrogen online monitor, an acetic acid rich liquid pipe and a water inlet pipe, the hydrogen pipe is connected with a hydrogen storage tank, the purified biogas pipe is connected with the biogas purification device, and a regulating valve is arranged on the hydrogen pipe.

[0006] Preferably, a suction pump and a spray mechanism are provided inside the anaerobic reactor, and a mixing box is connected to the outer wall of the anaerobic reactor.

[0007] Preferably, a drug feed pump and a drug feed pipe are connected between the mixing box and the anaerobic reactor, a stirrer is installed at the bottom of the mixing box, a stirrer is arranged inside the mixing box, and the mixing box is connected to an additive box.

[0008] Preferably, the output end of the anaerobic reactor is connected to the input end of the crude biogas pipe, the output end of the crude biogas pipe is connected to the input end of the biogas purification device, the output end of the biogas purification device is connected to the input end of the purified biogas pipe, the output end of the purified biogas pipe is connected to the input end of the carbon dioxide releaser, and the biological carbon fixation reactor is connected to the methane online monitor, the carbon dioxide online monitor, the purified biogas pipe, the hydrogen online monitor, the acetic acid rich liquid pipe and the water inlet pipe.

[0009] Preferably, the output end of the hydrogen pipe is connected to the input end of the hydrogen releaser through the hydrogen pipe and is controlled by a regulating valve.

[0010] Preferably, the output end of the additive box is connected to the input end of the mixing box, the mixer drives the agitator to rotate at high speed inside the mixing box, and the output end of the mixing box is connected to the input end of the anaerobic reactor through a drug feed pump and a drug feed pipe.

[0011] Beneficial effects: Compared with the prior art, the utility model provides a reactor for biological carbon fixation of biogas, which has the following beneficial effects: the reactor for biological carbon fixation of biogas adopts biological methods to fix carbon dioxide, has low energy consumption, does not require the addition of chemical agents, and has low operating costs; the carbon dioxide fixed by microorganisms is simultaneously converted into acetic acid, which reduces greenhouse gas emissions, and the product can be used as a chemical product; after purification by biological methods, the methane content can reach more than 97%, meeting the natural gas standard; a bubble-free membrane is used to diffuse hydrogen and carbon dioxide into the reactor, with high mass transfer efficiency and more thorough reaction, the entire reactor for biological carbon fixation of biogas has a simple structure, is easy to operate, and has better effects than traditional methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The utility model is a schematic diagram of the overall structure of a reactor for biological carbon fixation of biogas.

[0013] Figure 2 The utility model is a schematic diagram of the structure of an anaerobic reactor in a reactor for biological carbon fixation of biogas.

[0014] Figure 3 The utility model is a schematic structural diagram of a biological carbon fixation reactor in a reactor for biological carbon fixation of biogas.

[0015] Figure 4 The utility model is a schematic diagram of the structure of a mixing box in a reactor for biological carbon fixation of biogas.

[0016] In the figure: 1. anaerobic reactor; 2. biological carbon fixation reactor; 3. biogas purification device; 4. carbon dioxide releaser; 5. hydrogen releaser; 6. hydrogen storage tank; 7. methane online monitor; 8. carbon dioxide online monitor; 9. hydrogen online monitor; 10. regulating valve; 11. water inlet pipe; 12. crude biogas pipe; 13. purified biogas pipe; 14. hydrogen pipe; 15. purified biogas pipe; 16. acetic acid rich liquid pipe; 17. suction pump; 18. spray mechanism; 19. mixing box; 20. additive box; 21. mixer; 22. agitator; 23. drug inlet pump; 24. drug inlet pipe. DETAILED DESCRIPTION

[0017] The technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but those skilled in the art will understand that the embodiments described below are part of the embodiments of the utility model, rather than all of the embodiments, and are only used to illustrate the utility model, and should not be considered as limiting the scope of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the utility model. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0018] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] like Figure 1-4As shown, a reactor for biological carbon fixation of biogas includes an anaerobic reactor 1, a biological carbon fixation reactor 2 and a hydrogen storage tank 6. The top of the anaerobic reactor 1 is connected to a rough biogas pipe 12, and the rough biogas pipe 12 is connected to a biogas purification device 3. A carbon dioxide releaser 4 and a hydrogen releaser 5 are arranged inside the biological carbon fixation reactor 2. The carbon dioxide releaser 4 is connected to a purified biogas pipe 13, and the hydrogen releaser 5 is connected to a hydrogen pipe 14. The biological carbon fixation reactor 2 is connected to a methane online monitor 7, a carbon dioxide online monitor 8, a purified biogas pipe 15, a hydrogen online monitor 9, and an acetic acid rich liquid pipe 16 is connected to the water inlet pipe 11, the hydrogen pipe 14 is connected to the hydrogen storage tank 6, the purified biogas pipe 13 is connected to the biogas purification device 3, and the hydrogen pipe 14 is provided with a regulating valve 10. The carbon dioxide is fixed by biological method, the energy consumption is low, no chemical agent is needed, and the operation cost is low; the carbon dioxide fixed by microorganisms is converted into acetic acid at the same time, which reduces the emission of greenhouse gases, and the product can be used as a chemical product; after purification by biological method, the methane content can reach more than 97%, reaching the natural gas standard; the bubble-free membrane is used to diffuse hydrogen and carbon dioxide into the reactor, the mass transfer efficiency is high, and the reaction is more thorough.

[0021] Furthermore, a suction pump 17 and a spray mechanism 18 are provided inside the anaerobic reactor 1 , and a mixing box 19 is connected to the outer wall of the anaerobic reactor 1 .

[0022] Furthermore, a drug feed pump 23 and a drug feed pipe 24 are connected between the mixing box 19 and the anaerobic reactor 1 , a stirrer 21 is installed at the bottom of the mixing box 19 , a stirrer 22 is arranged inside the mixing box 19 , and the mixing box 19 is connected to an additive box 20 .

[0023] Furthermore, the output end of the anaerobic reactor 1 is connected to the input end of the crude biogas pipe 12, the output end of the crude biogas pipe 12 is connected to the input end of the biogas purification device 3, the output end of the biogas purification device 3 is connected to the input end of the purified biogas pipe 13, the output end of the purified biogas pipe 13 is connected to the input end of the carbon dioxide releaser 4, and the biological carbon fixation reactor 2 is connected to the methane online monitor 7, the carbon dioxide online monitor 8, the purified biogas pipe 15, the hydrogen online monitor 9, the acetic acid rich liquid pipe 16 and the water inlet pipe 11.

[0024] Furthermore, the output end of the hydrogen pipe 14 is connected to the input end of the hydrogen releaser 5 through the hydrogen pipe 14 and is controlled by the regulating valve 10 .

[0025] Furthermore, the output end of the additive box 20 is connected to the input end of the mixing box 19, and the mixer 21 drives the agitator 22 to rotate at high speed inside the mixing box 19. The output end of the mixing box 19 is connected to the input end of the anaerobic reactor 1 through the drug feed pump 23 and the drug feed pipe 24.

[0026] Working principle: The utility model comprises an anaerobic reactor 1, a biological carbon fixation reactor 2, a biogas purification device 3, a carbon dioxide releaser 4, a hydrogen releaser 5, a hydrogen storage tank 6, a methane online monitor 7, a carbon dioxide online monitor 8, a hydrogen online monitor 9, a regulating valve 10, a water inlet pipe 11, a crude biogas pipe 12, a purified biogas pipe 13, a hydrogen pipe 14, a purified biogas pipe 15, an acetic acid rich liquid pipe 16, a suction pump 17, a spray mechanism 18, a mixing box 19, an auxiliary agent box 20, a stirrer 21, a stirrer 22, a drug feed pump 23 and a drug feed pipe 24. The carbon dioxide is fixed by biological methods, and the energy consumption is low, no chemical agents need to be added, and the operating cost is low; the carbon dioxide fixed by microorganisms is simultaneously converted into acetic acid, which reduces the emission of greenhouse gases, and the product can be used as a chemical product; after being purified by biological methods, the content of methane can reach more than 97%, reaching the natural gas standard; a bubble-free membrane is used to diffuse hydrogen and carbon dioxide into the reactor, and the mass transfer efficiency is high and the reaction is more thorough.

[0027] The raw biogas produced by the anaerobic reactor 1 passes through the biogas purification device 3 to remove moisture and impurities to obtain purified biogas, which enters the carbon dioxide releaser 4 arranged in the biological carbon fixation reactor 2. The carbon dioxide in the biogas diffuses from the membrane cavity of the membrane component to the biofilm on the surface of the membrane fiber. The hydrogen in the hydrogen pipe 14 in the hydrogen storage tank 6 enters the hydrogen releaser 5. The hydrogen diffuses from the membrane cavity of the membrane component to the biofilm on the surface of the membrane fiber. The biological carbon fixation reactor 2 is inoculated with the same type of acid-producing bacteria, which metabolize hydrogen and carbon dioxide to produce organic acetic acid.

[0028] The homoacetogenic reaction is as follows:

[0029] 4H2+2CO2------------- CH3COOH+ 2H2O

[0030] The water inlet pipe 11 is wastewater or artificial nutrient solution rich in nitrogen, phosphorus and nutrients, which is used as a nutrient supplement for the growth of homotypic acid-producing bacteria. The acetic acid-rich solution produced can be used as a carbon source for heterotrophic microorganisms or other chemical primary raw materials. After carbon fixation, purified biogas is obtained.

[0031] A methane online monitor 7 , a carbon dioxide online monitor 8 and a hydrogen online monitor 9 are arranged on the upper part of the biological carbon fixation reactor 2 .

[0032] The carbon dioxide releaser 4 and the hydrogen releaser 5 are both in the form of membrane components, using a breathable membrane to dissolve gas and diffuse gas through the gas concentration difference inside and outside the membrane cavity. The membrane material is a hydrophobic material such as vinylidene fluoride PVDF or silicone. Dense membranes, microporous membranes and composite membranes are all acceptable.

[0033] The membrane in the carbon dioxide releaser 4 allows carbon dioxide to diffuse into the water body in the form of molecules, while water does not reversely permeate to the gas phase side. No bubbles are generated during the transfer of carbon dioxide, which is conducive to improving the solubility in water. The gas supply method of the membrane module is through-type. Methane and other small amounts of gas that have not diffused into the water are discharged from the other end of the membrane cavity.

[0034] The membrane in the hydrogen releaser 5 allows hydrogen to diffuse into the water body in the form of molecules, while water will not permeate back to the gas phase side. No bubbles are generated during the transfer of hydrogen, which is conducive to improving the solubility in water.

[0035] The membrane modules are available in hollow fiber, flat plate or roll format.

[0036] The material of the membrane support is SS304. The membrane support of the carbon dioxide releaser 4 is provided with a gas stripping unit, which uses methane and other gases that do not pass through the membrane as power to stir the liquid in the entire reactor, thereby increasing the contact between microorganisms and metabolites and improving the reaction efficiency.

[0037] The reactor is a closed structure with a water-sealed floating cover on the top. When the carbon dioxide releaser 4 and the hydrogen releaser 5 are inspected or maintained, the floating cover is removed to take out the carbon dioxide releaser 4 and the hydrogen releaser 5.

[0038] The water in the same type of acid-generating reaction stays in the reactor for 4 to 6 hours. The suitable water temperature in the reactor is 35 to 39°C.

[0039] The homoacetogenic stage is one of the four stages of anaerobic fermentation. The homoacetogenic bacteria in the reactor are taken into the anaerobic reactor and are screened, purified and cultured.

[0040] A methane online monitor 7, a carbon dioxide online monitor 8 and a hydrogen online monitor 9 are arranged on the top of the reactor. When the reactor is running stably, the values ​​of the methane online monitor 7, the carbon dioxide online monitor 8 and the hydrogen online monitor 9 are all at a relatively stable value.

[0041] When the methane online monitor 7 is lower than a certain value, it means that the homogeneous acid production reaction is not complete, and the microbial activity in the reactor needs to be checked, or the biogas supply after purification is insufficient, or the hydrogen supply may be excessive.

[0042] When the carbon dioxide online monitor 8 is higher than a certain value, it means that the same type of acid production reaction is not complete, and the microbial activity in the reactor needs to be checked. It may also be that the hydrogen supply is excessive.

[0043] When the hydrogen online monitor 9 is higher than a certain value, it means that the same type of acid production reaction is not complete, and it is necessary to check the activity of microorganisms in the reactor, or the biogas supply after purification is insufficient, or the hydrogen supply may be excessive.

[0044] The amount of hydrogen supplied can be adjusted by regulating valve 10 .

[0045] The methane content of purified biogas is greater than 97%.

[0046] This method is also applicable to carbon fixation of pure carbon dioxide or other mixed gases containing carbon dioxide.

[0047] It should be noted that, in this article, relational terms such as first and second (number one, number two), etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0048] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A reactor for biogas biocarbon fixation, comprising an anaerobic reactor (1), a biocarbon fixation reactor (2) and a hydrogen storage tank (6), characterized in that: The top of the anaerobic reactor (1) is connected to a crude biogas pipe (12), and the crude biogas pipe (12) is connected to a biogas purification device (3). A carbon dioxide releaser (4) and a hydrogen releaser (5) are arranged inside the biological carbon fixation reactor (2). The carbon dioxide releaser (4) is connected to a purified biogas pipe (13), and the hydrogen releaser (5) is connected to a hydrogen pipe (14). The biological carbon fixation reactor (2) is connected to a methane online monitor (7), a carbon dioxide online monitor (8), a purified biogas pipe (15), a hydrogen online monitor (9), an acetic acid rich liquid pipe (16), and a water inlet pipe (11). The hydrogen pipe (14) is connected to a hydrogen storage tank (6), the purified biogas pipe (13) is connected to the biogas purification device (3), and a regulating valve (10) is arranged on the hydrogen pipe (14).

2. A reactor for biogas biocarbon fixation according to claim 1, characterized in that: A suction pump (17) and a spray mechanism (18) are provided inside the anaerobic reactor (1), and a mixing box (19) is connected to the outer wall of the anaerobic reactor (1).

3. A reactor for biogas biocarbon fixation according to claim 2, characterized in that: A drug feed pump (23) and a drug feed pipe (24) are connected between the mixing box (19) and the anaerobic reactor (1); a stirrer (21) is installed at the bottom of the mixing box (19); a stirrer (22) is arranged inside the mixing box (19); and the mixing box (19) is connected to an auxiliary agent box (20).

4. A reactor for biogas biocarbon fixation according to claim 1, characterized in that: The output end of the anaerobic reactor (1) is connected to the input end of a crude biogas pipe (12), the output end of the crude biogas pipe (12) is connected to the input end of a biogas purification device (3), the output end of the biogas purification device (3) is connected to the input end of a purified biogas pipe (13), the output end of the purified biogas pipe (13) is connected to the input end of a carbon dioxide releaser (4), and the biological carbon fixation reactor (2) is connected to an online methane monitor (7), an online carbon dioxide monitor (8), a purified biogas pipe (15), an online hydrogen monitor (9), an acetic acid rich liquid pipe (16) and a water inlet pipe (11).

5. A biogas biocarbon fixation reactor according to claim 1, characterized in that: The output end of the hydrogen pipe (14) is connected to the input end of the hydrogen releaser (5) through the hydrogen pipe (14), and is controlled by the regulating valve (10).

6. A biogas biocarbon fixation reactor according to claim 3, characterized in that: The output end of the auxiliary agent box (20) is connected to the input end of the mixing box (19); the stirrer (21) drives the stirrer (22) to rotate at a high speed inside the mixing box (19); and the output end of the mixing box (19) is connected to the input end of the anaerobic reactor (1) via a drug feed pump (23) and a drug feed pipe (24).

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