Biogas recycling system for anaerobic tank

Abstract

The utility model belongs to the technical field of landfill leachate treatment, and particularly discloses a biogas recycling system for an anaerobic tank, which comprises the anaerobic tank and a biogas evaporator, the biogas evaporator is connected with the anaerobic tank through a main pipe, and a biogas fan for providing power is arranged on the main pipe. The methane evaporator is sequentially connected with a gas utilization device, a steam-water flash tank and a thermal deaerator through pipelines, the thermal deaerator is connected with the methane evaporator through a pipeline to form a closed loop, and a water feeding pump for providing power is arranged on the pipeline connected between the thermal deaerator and the methane evaporator. Compared with the prior art that the biogas is directly conveyed to the biogas torch for direct combustion, the biogas recycling system disclosed by the utility model has the advantages that the biogas generated by the anaerobic tank can be effectively utilized, the energy waste is avoided, and the energy recycling is realized; in addition, equipment in the system can be maintained through the standby pipe under the condition that biogas conveying is not stopped.

Description

Technical Field

[0001] The utility model relates to the technical field of landfill leachate treatment, in particular to a biogas recycling system for an anaerobic pond. Background Art

[0002] In a waste incineration power plant, waste first ferments in a waste pit, and the leachate generated by the fermentation of the waste needs to be transported to a leachate treatment system for a series of treatments. The leachate treatment system includes an adjustment pond, an anaerobic pond, a denitrification pond, a digestion pond, etc. The main function of the anaerobic pond is to use anaerobic bacteria to hydrolyze, acidify and methanate organic substances, so as to remove the organic substances in the leachate and improve the biodegradability of the leachate, which is beneficial to subsequent aerobic treatment. In the anaerobic pond, a large amount of biogas will be generated after the anaerobic reaction of the leachate. The biogas is stinky and is a combustible substance that is toxic and harmful. Therefore, the biogas generated by the anaerobic pond must be treated.

[0003] Refer to Figure 1 , the biogas treatment system of the prior art includes an anaerobic pond (1) and a biogas flare (10). The anaerobic pond (1) is connected to the biogas flare (10) through a pipeline, and a biogas blower (201) for providing power is arranged on the pipeline. As can be seen from the above, the current treatment method for biogas is to directly transport the biogas to the biogas flare for combustion. It can be seen that the biogas treatment system of the prior art does not effectively utilize the biogas generated by the anaerobic pond, resulting in waste of energy. Summary of the Utility Model

[0004] Aiming at the technical problem that the biogas treatment system of the prior art does not effectively utilize the biogas generated by the anaerobic pond, resulting in waste of energy, the utility model provides a biogas recycling system for an anaerobic pond.

[0005] The technical solution adopted by the utility model is: a biogas recycling system for an anaerobic pond, including an anaerobic pond and a biogas evaporator. The biogas evaporator is connected to the anaerobic pond through a main pipe, and the main pipe is used to transport the biogas generated by the anaerobic pond. A biogas blower for providing power is arranged on the main pipe. The biogas evaporator is sequentially connected to a gas-using device, a steam-water expander, and a thermal deaerator through pipelines. The thermal deaerator is connected to the biogas evaporator through a pipeline to form a closed loop. A feed water pump for providing power is arranged on the pipeline connecting the thermal deaerator and the biogas evaporator.

[0006] Furthermore, a first valve is arranged on the main pipe. A spare pipe is arranged on the main pipe between the first valve and the biogas blower. A biogas flare is arranged at the end of the spare pipe, and the biogas flare is used to burn biogas. A second valve is arranged on the spare pipe.

[0007] Furthermore, the second valve is a manual valve.

[0008] Furthermore, the second valve is a manual gas valve.

[0009] Furthermore, a make-up water pipe is provided on the thermal deaerator, and a make-up water valve is provided on the make-up water pipe. The make-up water pipe is used to introduce water into the thermal deaerator.

[0010] Furthermore, the water introduced into the make-up water pipe is demineralized water.

[0011] Furthermore, the make-up water valve is a manual ball valve.

[0012] The beneficial effects of the present utility model are as follows:

[0013] 1. Compared with the prior art of directly transporting biogas to a biogas flare for direct combustion, the biogas recycling system of the present utility model can effectively utilize the biogas generated in the anaerobic pond, avoid waste of energy, and achieve recycling of energy.

[0014] 2. The present utility model can maintain the equipment in the system without stopping the transportation of biogas through the standby pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of a prior art biogas treatment system.

[0016] Figure 2 is a schematic structural diagram of the present utility model.

[0017] The labels in the figure are:

[0018] 1. Anaerobic pond;

[0019] 2. Main pipe; 201. Biogas blower; 202. First valve;

[0020] 3. Biogas evaporator; 4. Gas-using equipment; 5. Steam-water expansion vessel; 6. Thermal deaerator; 7. Feed water pump;

[0021] 8. Standby pipe; 801. Second valve;

[0022] 9. Make-up water pipe; 901. Make-up water valve;

[0023] 10. Biogas flare. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "front", "upper", "lower", "left", "right", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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 should not be construed as a limitation to the present utility model.

[0025] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "linkage" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] The following is a further description of the present utility model in conjunction with the attached Figure 2 drawings.

[0027] Embodiment 1

[0028] In view of the technical problems existing in the background art, the present utility model provides a biogas recycling system for an anaerobic pond.

[0029] In the specific technical solution, referring to Figure 2 , the biogas recycling system includes an anaerobic pond 1 and a biogas evaporator 3. The biogas evaporator 3 is connected to the anaerobic pond 1 through a main pipe 2. The main pipe 2 is used to transport the biogas generated by the anaerobic pond 1. A biogas blower 201 for providing power is arranged on the main pipe 2. The biogas evaporator 3 is sequentially connected to a gas-using device 4, a steam-water flash tank 5, and a thermal deaerator 6 through pipelines. The thermal deaerator 6 is connected to the biogas evaporator 3 through a pipeline to form a closed loop. A feed water pump 7 for providing power is arranged on the pipeline connecting the thermal deaerator 6 and the biogas evaporator 3.

[0030] Working principle: The function of the biogas evaporator 3 is to use biogas as an energy source, heat the evaporator by burning biogas, so as to realize the evaporation process of substances and achieve energy utilization. The main function of the steam-water flash tank 5 is to receive and collect the excess gas generated by the gas-using device 4 during operation due to thermal expansion and other reasons, so as to ensure the safe operation of the system; by collecting the excess gas, the steam-water flash tank 5 helps to maintain the pressure stability of the system and prevent equipment damage or safety accidents caused by excessive pressure; at the same time, the steam-water flash tank 5 also has a drainage function, and it can also receive and process the drainage (condensate water) discharged from the gas-using device 4, further improving the efficiency and safety of the system. The main function of the thermal deaerator 6 is to remove the dissolved oxygen and other corrosive gases in the feed water to prevent the biogas evaporator 3 and related equipment from being corroded, so as to extend the service life of the equipment and ensure the safe operation of the system. The gas-using device 4 can be a urea preparation system, a sludge drying system, a heating system for a UBF pond, etc. The biogas evaporator 3, the steam-water flash tank 5, and the thermal deaerator 6 are existing technical equipment, and their principles and structures will not be elaborated here.

[0031] As can be seen from the above structure and principle, compared with the prior art of directly transporting biogas to a biogas torch for direct combustion, the utility model converts biogas into heat energy through a biogas evaporator and provides the heat energy for gas-using equipment. After the steam is used by the gas-using equipment, it condenses into a steam-water mixture, and the steam-water mixture is collected in a thermal deaerator for recycling. The thermal deaerator performs deaeration operation on the condensed water, and finally returns to the biogas evaporator through a feed water pump for circulating heating to achieve circulation. It can be seen that the biogas recycling system of the utility model can effectively utilize the biogas generated in the anaerobic pond, avoid waste of energy, and achieve recycling of energy.

[0032] There are always certain losses in the steam and condensed water after being used by the steam-consuming equipment in the system, resulting in insufficient water volume in the biogas evaporator. Therefore, in view of the above technical problems, referring to Figure 2 , in this embodiment, a make-up water pipe 9 is also provided on the thermal deaerator 6. A make-up water valve 901 is provided on the make-up water pipe 9. The make-up water pipe 9 is used to introduce water into the thermal deaerator 6. Desalted water is regularly introduced into the thermal deaerator 6 through the make-up water pipe as the supplementary water for the system. The make-up water valve 901 in this embodiment adopts a manual ball valve.

[0033] Embodiment 2

[0034] The equipment in the biogas recycling system needs to be maintained regularly, and also needs to be repaired after equipment failures. Therefore, to facilitate the maintenance of the equipment without stopping the transportation of biogas, on the basis of Embodiment 1, referring to Figure 2 , in this embodiment, a first valve 202 is also provided on the main pipe 2, and a spare pipe 8 is provided on the main pipe 2 between the first valve 202 and the biogas blower 201. A biogas torch 10 is provided at the end of the spare pipe 8. The biogas torch 10 is used to burn biogas. A second gate valve 801 is provided on the spare pipe 8.

[0035] Working principle: The spare pipe is only used as a backup method. Under normal circumstances, the biogas generated in the anaerobic pond realizes energy recycling through the biogas evaporator 3. When the equipment in the biogas recycling system needs to be maintained or repaired, at this time, the first valve is closed and the second valve is opened, and the biogas at this time is transported to the biogas torch for combustion. It can be seen that the utility model can maintain the equipment without stopping the transportation of biogas through the spare pipe.

[0036] After all, the frequency of maintenance or repair of the equipment in the biogas recycling system is low. Therefore, the second valve 801 in this embodiment adopts a manual gas valve.

[0037] The specific embodiments described above further elaborate on the purpose, technical solution, and beneficial effects of the present utility model. It should be understood that the above description is only the specific embodiments of the present utility model and is not used to limit the protection scope of the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A biogas recycling system for an anaerobic tank, comprising an anaerobic tank (1), characterized in that: The invention also comprises a biogas evaporator (3), which is connected to the anaerobic tank (1) via a main pipe (2), the main pipe (2) is used to transport the biogas generated by the anaerobic tank (1), and a biogas fan (201) for providing power is arranged on the main pipe (2), the biogas evaporator (3) is connected to a gas-using device (4), a steam-water expansion tank (5), and a thermal deaerator (6) in sequence via a pipeline, the thermal deaerator (6) is connected to the biogas evaporator (3) via a pipeline to form a closed loop, and a water supply pump (7) for providing power is arranged on the pipeline connected between the thermal deaerator (6) and the biogas evaporator (3).

2. The biogas recycling system for anaerobic tanks according to claim 1, characterized in that: The main pipe (2) is provided with a first valve (202), a spare pipe (8) is provided on the main pipe (2) between the first valve (202) and the biogas blower (201), a biogas torch (10) is provided at the end of the spare pipe (8), the biogas torch (10) is used to burn biogas, and a second valve (801) is provided on the spare pipe (8).

3. The biogas recycling system for anaerobic tanks according to claim 2, characterized in that: The second valve (801) is a manual valve.

4. The biogas recycling system for anaerobic tanks according to claim 3, characterized in that: The second valve (801) is a manual gas valve.

5. The biogas recycling system for anaerobic tanks according to claim 1, characterized in that: The thermal deaerator (6) is provided with a water supply pipe (9), on which a water supply valve (901) is provided. The water supply pipe (9) is used to introduce water into the thermal deaerator (6).

6. The biogas recycling system for anaerobic tanks according to claim 5, characterized in that: The water introduced into the water supply pipe (9) is desalted water.

7. The biogas recycling system for anaerobic tanks according to claim 5, characterized in that: The water supply valve (901) is a manual ball valve.

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