Papermaking wastewater treatment biogas utilization device

Abstract

The utility model discloses a papermaking wastewater treatment biogas utilization device which comprises a wastewater anaerobic treatment unit, the wastewater anaerobic treatment unit is communicated with a gas-liquid separation tank, the output end of the gas-liquid separation tank is communicated with a water seal defoaming tank, the water seal defoaming tank is communicated with a biogas storage cabinet, and the biogas storage cabinet is communicated with a biogas storage tank. The biogas storage cabinet is provided with a first bypass pipeline, the biogas storage cabinet is communicated with a water-sealed tank through the bypass pipeline, one side of the biogas storage cabinet is provided with a booster fan, the input end of the booster fan is communicated with the biogas storage cabinet, and the output end of the booster fan is communicated with a desulfurization system; and the desulfurization system is communicated with the steam boiler. According to the utility model, the torch body is arranged in front of the booster fan and is used for emergency combustion treatment under the working conditions of follow-up single body troubleshooting or unstable gas flow and the like, so that the biogas can be effectively treated and fully utilized, and the utilization rate of the biogas is increased.

Description

Technical Field

[0001] This utility model relates to the field of biogas treatment technology, and in particular to a biogas utilization device for treating papermaking wastewater. Background Technology

[0002] In the anaerobic treatment of papermaking wastewater, the efficient utilization of biogas faces multiple technical challenges: the biogas contains too high a proportion of corrosive components such as hydrogen sulfide and carbon dioxide, resulting in low calorific value and easy corrosion of equipment; the treatment system is affected by water quality fluctuations, resulting in unstable gas production and difficulty in meeting the needs of continuous utilization; when the system is in abnormal operation, the foam carried by the biogas can easily cause pipeline blockage or equipment failure.

[0003] Traditional biogas treatment methods often employ flare combustion, which, while effective for emergency biogas processing, results in energy waste and secondary sulfur oxide pollution. Some companies have attempted to use biogas for their own power plants, but its applicability is limited by the constraints of power plant infrastructure. Current technologies have not effectively addressed issues such as improving biogas quality, ensuring stable supply, and achieving low-cost purification; therefore, there is an urgent need to develop more adaptable resource utilization solutions.

[0004] Patent document CN211972287U discloses a biogas treatment system for a landfill leachate regulating pond, including an inlet pipe, a regulating pond sealing device, a biogas collection device, an exhaust fan, and a water-gas separator flare combustion device. The regulating pond sealing device includes a regulating pond and a geomembrane, with the geomembrane covering the regulating pond and extending to the ground around the perimeter of the regulating pond and fixed thereon. The inlet pipe is connected to the regulating pond. The biogas collection device includes a biogas collection pipe, with its inlet end connected to the regulating pond and its outlet end connected to the inlet of the exhaust fan. The exhaust fan's outlet is connected to the water-gas separator, which is connected to the flare combustion device. The flare combustion device is used to burn the gas separated by the water-gas separator. This invention collects biogas through a biogas collection pipe, simultaneously extracts biogas from the landfill leachate using an exhaust fan, and treats the biogas using a flare combustion device, thus solving the odor problem in the regulating pond.

[0005] As in the prior art of the aforementioned patent, the system uses a torch to directly burn biogas, which does not fully utilize the biogas. The economic and industrial value of biogas itself has not been fully developed. Secondly, the torch directly draws in biogas using a blower, but it is difficult for outside air to re-enter the interior to enhance combustion efficiency. If ventilation holes are opened, there is also a risk of biogas leakage. Therefore, a biogas recovery and utilization device that can solve the above problems is needed. Utility Model Content

[0006] The purpose of this invention is to provide a biogas utilization device for papermaking wastewater treatment, so as to solve the above-mentioned shortcomings in the prior art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a biogas utilization device for papermaking wastewater treatment, comprising an anaerobic wastewater treatment unit, wherein the anaerobic wastewater treatment unit is interconnected with a gas-liquid separator, the output end of the gas-liquid separator is connected to a water-sealed demister, the water-sealed demister is connected to a biogas storage tank, the biogas storage tank is provided with a first bypass pipe, the biogas storage tank is connected to a water-sealed tank through the bypass pipe, a booster fan is provided on one side of the biogas storage tank, the input end of the booster fan is connected to the biogas storage tank, the output end of the booster fan is connected to a desulfurization system, the desulfurization system is connected to a steam boiler, a second bypass pipe is provided between the desulfurization system and the steam boiler, the second bypass pipe is connected to a self-owned power plant, a third bypass pipe is provided between the biogas storage tank and the booster fan, and the third bypass pipe is connected to a flare assembly.

[0008] As a further description of the above technical solution: the flare assembly includes a flare body and a secondary air intake assembly. An igniter body is fixedly installed inside the flare body. A biogas pipe is connected to one side of the flare body and is connected to a third bypass pipe.

[0009] As a further description of the above technical solution: the secondary air intake assembly includes a plurality of second passage slots opened on the torch body, an annular chamber fixedly sleeved on the torch body, and an annular component fixedly installed on the inner wall of the torch body. The annular component has a first passage slot corresponding to the plurality of second passage slots. The interior of the annular chamber is connected to the interior of the torch body through the first passage slot and the second passage slot.

[0010] As a further description of the above technical solution: the secondary air intake assembly also includes a blower, and the output end of the blower is provided with a secondary air intake pipe, which is connected to the bottom end of the annular chamber.

[0011] As a further description of the above technical solution: the inner wall of the annular part is provided with a plurality of air guide plates, and the plurality of air guide plates are respectively arranged in a plurality of second through slots. Each air guide plate includes a bottom plate and a side plate. The plurality of bottom plates are inclined upwards, and the plurality of side plates are inclined in a counterclockwise direction.

[0012] As a further description of the above technical solution: the top of the torch body is provided with multiple support members, and the top of the multiple support members is fixedly connected with a rainproof member.

[0013] This invention provides a biogas utilization device for treating papermaking wastewater. It offers the following advantages: A high-efficiency anaerobic reactor deeply degrades organic matter in the wastewater to produce biogas. Subsequently, biogas and wastewater are separated in a gas-liquid separator. A water-sealed demister tank eliminates large amounts of foam generated during the initial stages of wastewater treatment or in case of operational abnormalities, preventing it from entering subsequent systems. The separated biogas enters a biogas storage tank for volume buffering and pressure stabilization. A safety water seal before the storage tank effectively prevents biogas leakage and equipment overpressure damage. After being pressurized by a booster fan, the biogas is sent to a desulfurization system for purification, removing impurities such as hydrogen sulfide. The purified biogas can be directly supplied to a steam boiler to produce steam or hot water, connected to a gas pipeline network as an energy source, or transported to a self-owned power plant for power generation. The system is specially equipped with an emergency flare assembly that automatically activates during equipment maintenance or biogas volume fluctuations. Safe combustion prevents biogas overpressure leakage or disorderly emissions, forming a dual safety guarantee mechanism together with the safety water seal.

[0014] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0015] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a biogas utilization device for papermaking wastewater treatment proposed in this utility model.

[0017] Figure 2 This is a three-dimensional structural diagram of the torch body of this utility model;

[0018] Figure 3 This is a three-dimensional cross-sectional structural diagram of the torch body of this utility model;

[0019] Figure 4 This is a three-dimensional cross-sectional view of the secondary air intake assembly of the torch of this utility model.

[0020] Figure 5 This is a three-dimensional structural schematic diagram of the air guide plate of this utility model;

[0021] Figure 6 This is a top view cross-sectional structural diagram of the annular component of this utility model.

[0022] Legend:

[0023] 1. Anaerobic wastewater treatment unit; 2. Gas-liquid separator; 3. Water seal demister; 4. Biogas storage tank; 5. Water seal tank; 501. First bypass pipeline; 6. Booster fan; 7. Desulfurization system; 8. Steam boiler; 9. Self-owned power plant; 901. Second bypass pipeline; 10. Flare body; 1001. Third bypass pipeline; 11. Rainproof component; 12. Support component; 13. Biogas pipe; 14. Blower; 15. Secondary air inlet pipe; 16. Annular compartment; 17. Igniter body; 18. Annular component; 19. First through channel; 20. Second through channel; 21. Air guide plate; 2101. Bottom plate; 2102. Side plate. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Reference Figure 1-6A biogas utilization device for treating papermaking wastewater includes an anaerobic wastewater treatment unit 1, which is interconnected with a gas-liquid separator 2. A water-sealed demister 3 is connected to the output end of the gas-liquid separator 2. The water-sealed demister 3 is connected to a biogas storage tank 4. The biogas storage tank 4 is equipped with a first bypass pipe 501 and is connected to a water-sealed tank 5 via the bypass pipe. A booster fan 6 is installed on one side of the biogas storage tank 4. The input end of the blower 6 is connected to the biogas storage tank 4, and the output end of the booster blower 6 is connected to the desulfurization system 7. The desulfurization system 7 is connected to the steam boiler 8. A second bypass pipe 901 is provided between the desulfurization system 7 and the steam boiler 8. The second bypass pipe 901 is connected to a self-provided power plant 9. A third bypass pipe 1001 is provided between the biogas storage tank 4 and the booster blower 6. The third bypass pipe 1001 is connected to a flare assembly. The wastewater to be treated... The biogas enters the anaerobic wastewater treatment unit 1, where it is mixed with wastewater and enters the gas-liquid separator 2 for gas-liquid separation. Excess foam is eliminated by the water-sealed defoaming tank 3. The biogas then enters the biogas storage tank 4 for buffering. The water seal pipe installed before the biogas storage tank 4 can achieve a safe water seal to prevent leakage and also protect the biogas storage tank 4 from overpressure damage. The biogas in the biogas storage tank 4 is pressurized by the booster fan 6 and then sent to the desulfurization system 7. The desulfurization system 7 can remove hydrogen sulfide and other sulfur compounds from the biogas. The purified and desulfurized biogas can enter the steam boiler 8 to produce steam or hot water for workshop production, or it can enter the gas pipeline network for gas energy. It can also enter the self-owned power plant 9 for power generation through the second bypass pipe 901. Since the above process is a continuous process, a flare body 10 is set before the booster fan 6 for emergency combustion treatment in case of subsequent single-unit failure maintenance or unstable gas volume. The above device can effectively treat biogas and make full use of biogas, increasing the utilization rate of biogas.

[0026] It is worth mentioning that the above-mentioned anaerobic wastewater treatment unit 1 is a preliminary biochemical treatment process for papermaking wastewater. It anaerobically treats the COD in the papermaking wastewater to produce biogas. The anaerobic treatment commonly used in paper mills includes EGSB anaerobic reactors and IC anaerobic reactors.

[0027] The water-sealed demister 3 is used to remove a large amount of foam generated during the initial start-up, high load, and abnormal operation of the anaerobic wastewater treatment unit 1, so as to prevent the foam from entering the subsequent pipelines and biogas storage tank 4.

[0028] The biogas storage tank 4 is used to balance the difference between the biogas production at the front end and the biogas demand at the back end, playing a role in gas volume buffering and regulation, and pressure stabilization. The commonly used types of biogas storage tank 4 are mainly double-membrane dry storage tanks and floating roof storage tanks. In order to protect the biogas storage tank 4 and prevent overpressure damage, a safety water seal is installed in front of the biogas storage tank 4. At the same time, the biogas storage tank 4 is equipped with a bypass for easy maintenance.

[0029] As a preferred technical solution in this embodiment, the flare assembly includes a flare body 10 and a secondary air intake assembly. An igniter body 17 is fixedly installed inside the flare body 10. A biogas pipe 13 is connected to one side of the flare body 10 and is connected to a third bypass pipe 1001. The flare body 10 is a prior art technology, and its function is to introduce biogas into the flare and ignite it through an igniter to burn the biogas. The secondary air intake assembly can increase ventilation and further increase the combustion efficiency of biogas.

[0030] As a preferred technical solution of this embodiment, the secondary air intake assembly includes a plurality of second through slots 20 formed on the torch body 10, an annular chamber 16 fixedly sleeved on the torch body 10, and an annular member 18 fixedly installed on the inner wall of the torch body 10. The annular member 18 has a first through slot 19 corresponding to the plurality of second through slots 20. The interior of the annular chamber 16 is connected to the interior of the torch body 10 through the first through slot 19 and the second through slot 20. Air can be introduced into the interior of the torch body 10 through the annular chamber 16 and enter the interior of the torch body 10 through the first through slot 19 and the second through slot 20.

[0031] As a preferred technical solution of this embodiment, the secondary air intake assembly further includes a blower 14, and the output end of the blower 14 is provided with a secondary air intake pipe 15, which is connected to the bottom end of the annular chamber 16; the blower 14 can ventilate the interior of the annular chamber 16 to achieve secondary air intake.

[0032] As a preferred technical solution of this embodiment, the inner wall of the annular component 18 is provided with a plurality of air guide plates 21, which are sequentially arranged at a plurality of second through slots 20. Each air guide plate 21 includes a bottom plate 2101 and a side plate 2102. The bottom plate 2101 is inclined upward, and the side plate 2102 is inclined in a counterclockwise direction. The air guide can guide the airflow through the first through slot 19 and the second through slot 20, so that the air forms an upward rotating airflow. The rotating airflow can, on the one hand, push the biogas introduced through the biogas pipe 13 upward for combustion and gas supply, and on the other hand, the generated spiral airflow can better mix the biogas and increase the combustion efficiency of the biogas.

[0033] As a preferred technical solution in this embodiment, the top of the torch body 10 is provided with a plurality of support members 12, and the top of the plurality of support members 12 is fixedly connected with a rain shield 11; the rain shield 11 can prevent rainwater from entering the torch and avoid affecting the normal operation of the torch.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A papermaking wastewater treatment and biogas utilization apparatus comprising a wastewater anaerobic treatment unit (1), characterized by, The wastewater anaerobic treatment unit (1) is communicated with a gas-liquid separation tank (2), the output end of the gas-liquid separation tank (2) is communicated with a water seal defoaming tank (3), the water seal defoaming tank (3) is communicated with a biogas storage tank (4), the biogas storage tank (4) is provided with a first bypass pipeline (501), the biogas storage tank (4) is communicated with a water seal tank (5) through a bypass pipeline, one side of the biogas storage tank (4) is provided with a booster fan (6), the input end of the booster fan (6) is communicated with the biogas storage tank (4), the output end of the booster fan (6) is communicated with a desulfurization system (7), the desulfurization system (7) is communicated with a steam boiler (8), a second bypass pipeline (901) is arranged between the desulfurization system (7) and the steam boiler (8), the second bypass pipeline (901) is communicated with a self-provided power plant (9), a third bypass pipeline (1001) is arranged between the biogas storage tank (4) and the booster fan (6), and the third bypass pipeline (1001) is communicated with a torch assembly.

2. The papermaking wastewater treatment and biogas utilization apparatus according to claim 1, wherein The torch assembly comprises a torch body (10) and a secondary air inlet assembly, a lighter body (17) is fixedly installed in the torch body (10), a biogas pipe (13) is communicated and installed on one side of the torch body (10), and the biogas pipe (13) is communicated with the third bypass pipeline (1001).

3. The papermaking wastewater treatment and biogas utilization apparatus according to claim 2, characterized by The secondary air inlet assembly comprises a plurality of second through grooves (20) formed in the torch body (10), an annular bin (16) fixedly sleeved on the torch body (10) and an annular piece (18) fixedly installed on the inner wall of the torch body (10), a plurality of first through grooves (19) corresponding to the plurality of second through grooves (20) are formed in the annular piece (18), and the inside of the annular bin (16) is communicated with the inside of the torch body (10) through the first through grooves (19) and the second through grooves (20).

4. The papermaking wastewater treatment and biogas utilization apparatus according to claim 2, characterized by The secondary air inlet assembly further comprises a blower (14), and the output end of the blower (14) is provided with a secondary air inlet pipe (15) communicated with the bottom end of the annular bin (16).

5. The papermaking wastewater treatment and biogas utilization apparatus according to claim 3, characterized by The inner wall of the annular piece (18) is provided with a plurality of air deflectors (21), and the plurality of air deflectors (21) are sequentially arranged at the plurality of second through grooves (20), respectively.

6. The papermaking wastewater treatment and biogas utilization apparatus according to claim 2, wherein The top end of the torch body (10) is provided with a plurality of supporting pieces (12), and the top end of each supporting piece (12) is fixedly connected with a rain shielding piece (11).

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