Novel biogas recovery device

Abstract

The utility model relates to the technical field of methane recovery, in particular to a methane recovery device which comprises a methane recovery module and an overpressure emptying module, the biogas recovery module comprises a biogas generator, a booster fan and an incinerator which are sequentially connected through a gas pipeline, a first water-sealed tank is arranged between the biogas generator and the booster fan, and a second water-sealed tank is arranged between the booster fan and the incinerator; the biogas generator is communicated with the first water-sealed tank through a first gas pipeline; the overpressure emptying module comprises an air discharging pipeline, an emptying valve and an emptying water-sealed tank, one end of the air discharging pipeline is communicated with the first air conveying pipeline, the other end of the air discharging pipeline is communicated to the interior of the emptying water-sealed tank, the emptying valve is arranged on the air discharging pipeline, and an emptying valve is arranged on the emptying water-sealed tank. The system comprises a dual pressure stabilizing system and emptying and overpressure protection integrated dual-mode switching, and has the advantages of being simple in structure, low in cost, high in operation stability and safety and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of biogas recovery, in particular to a novel biogas recovery device. Background Art

[0002] At present, the chemical industry is generally equipped with sewage treatment plants and incinerators to treat the wastewater and waste gas generated during the production process. In the sewage treatment process, anaerobic treatment processes are usually used. This process produces a large amount of biogas, of which the main component methane has a high calorific value. Recycling this biogas into the incinerator for heat production can reduce the incinerator's dependence on other fuel gases. However, the amount of biogas produced during the anaerobic treatment process is unstable, and biogas is flammable and explosive, which poses a high risk. Currently, most existing technologies use more complex pressure stabilization systems to stabilize the biogas pressure. Not only is the cost high, but the biogas recovery process and subsequent maintenance are also complicated, making it unsuitable for small and medium-sized enterprises. Utility Model Content

[0003] The purpose of the utility model is to provide a novel biogas recovery device, aiming to solve the technical problems existing in the prior art such as the biogas recovery system having a complex structure, complicated recovery process and subsequent maintenance, and high cost.

[0004] In order to solve the above technical problems, the present utility model provides a new type of biogas recovery device, including a biogas recovery module and an overpressure venting module; the biogas recovery module includes a biogas generator, a booster fan and an incinerator, a first water seal tank is provided between the biogas generator and the booster fan, a second water seal tank is provided between the booster fan and the incinerator, and the biogas generator and the first water seal tank are connected through a first gas pipeline; the overpressure venting module includes a vent pipe, a vent valve, and a vent water seal tank, one end of the vent pipe is connected to the first gas pipeline, and the other end is connected to the interior of the vent water seal tank, the vent valve is provided on the vent pipe, and a drain valve is provided on the vent water seal tank.

[0005] The first water seal tank uses its water seal layer to perform secondary gas-liquid separation on the biogas, dries the biogas, and prevents the biogas fan from carrying liquid during operation, which is beneficial to improving the safety of equipment operation; in addition, the first water seal tank can maintain the pressure of the biogas generator and the biogas recovery system stable. The second water seal tank also has the above-mentioned functions of the first water seal tank, which can maintain the pressure of the biogas recovery system stable. At the same time, it can also prevent the burning biogas from flowing back from the input end of the incinerator to the output end of the booster fan, thereby improving the safety of the equipment and further improving the safety of the device. In addition, the first water seal tank and the second water seal tank can also remove some impurities in the biogas and have the effect of purifying the biogas. Therefore, the first water seal tank and the second water seal tank form a dual pressure stabilization system, which can ensure that the pressure of the biogas recovery system remains stable, effectively improving the stability and safety of the biogas recovery process.

[0006] For the overpressure venting module, on the one hand, when the biogas generated by the biogas generator needs to be vented directly, the water in the venting water seal tank is emptied through the vent valve, and then the venting valve is opened, and the biogas will be discharged directly from the venting pipe; on the other hand, when it is necessary to recover the biogas to the incinerator, the venting valve and the venting valve are kept closed first, and water is added to the venting water seal tank to make the liquid level meet the venting pressure required by the biogas pipeline network. After the biogas is transported to the incinerator, the venting valve is opened to complete the commissioning of the venting water seal tank; during operation, when the first gas pipeline of the device is overpressured, the biogas will pass through the venting pipe, break through the water seal of the venting water seal tank and be discharged, thereby preventing the biogas generator from being damaged by overpressure. Therefore, the venting water seal tank can prevent the first gas pipeline from being damaged by overpressure and damaging the biogas generator; combined with the opening and closing of the venting valve and the venting valve, the overpressure venting module can be switched between venting and commissioning, which is conducive to simplifying the structure of the biogas recovery system and further improving the stability and safety of biogas recovery.

[0007] Preferably, the biogas generator includes an anaerobic reactor and a gas-water separator, and the top of the anaerobic generator is connected to the gas-water separator.

[0008] The anaerobic reactor produces biogas for the device, and the gas-water separator can remove the liquid phase in the biogas, thereby improving the flammability and combustion efficiency of the biogas. After removing the water, the dry biogas can reduce corrosion to the device and extend the service life of various components in the device. In addition, installing a gas-water separator at the output end of the anaerobic reactor can also prevent direct damage to the anaerobic reactor when the biogas is over-pressurized to a certain extent, which is beneficial to improving the safety of the device.

[0009] Preferably, the output end of the gas-water separator is connected to the input end of the first water seal tank through the first gas pipeline, the output end of the first water seal tank is connected to the input end of the booster fan through the second gas pipeline, and the output end of the booster fan is connected to the input end of the second water seal tank through the third gas pipeline.

[0010] The booster fan can pressurize the biogas and improve the fluidity of the biogas in the device pipeline. The output end of the first water seal tank is connected to the input end of the booster fan, so that the pressure of the biogas before entering the booster fan can be maintained stable, and the pressurized biogas can be prevented from backflowing, thereby affecting the operation of the first water seal tank and the biogas generator; after being pressurized by the booster fan, the biogas enters the second water seal tank through the output end of the booster fan and the input end of the second water seal tank. After entering, the biogas can be prevented from backflowing back into the booster fan, so that the pressure of the biogas output by the booster fan can be maintained stable, and the output end of the second water seal tank can output biogas stably; therefore, through the first water seal tank, the booster fan and the second water seal tank, the air pressure in the biogas pipeline can be adjusted in real time to ensure that the air pressure is stable within the set range, thereby solving the problem of unstable air pressure.

[0011] Preferably, the output end of the second water seal tank is connected to the input end of the incinerator through a fourth gas pipeline.

[0012] The methane in biogas has a high calorific value. The biogas stably output by the second water seal tank is recovered into the incinerator for combustion and heat generation, and is applied to other processes and procedures. This can effectively reduce the gas consumption of the incinerator and improve the combustion efficiency of biogas, which is conducive to reducing energy consumption, improving biogas recovery efficiency, and reducing production and processing costs.

[0013] Preferably, the drain valve is located at the bottom of the drain water seal tank, and the vent pipe extends toward the bottom of the drain water seal tank.

[0014] The drain valve is located at the bottom of the drain water seal tank. It is not only easy to operate, but also can naturally drain the stored water by gravity alone, which is beneficial to optimizing the device structure and reducing the difficulty of operating the device; the vent pipe extends toward the bottom of the drain water seal tank, and the difference between it and the liquid level in the drain water seal tank will increase, thereby increasing the buffering time for biogas and increasing the adjustment range of biogas overpressure protection.

[0015] Preferably, the venting pipe is an inverted U-shaped pipe.

[0016] The inverted U-shaped pipe has a simple structure and is easy to install and maintain, which can reduce the difficulty of operation and maintenance costs. Due to the characteristics of its shape and structure, it also has the effects of guiding gas flow, smoothing gas flow rate, and preventing backfire. When the water seal tank is emptied to drain the stored water and directly emptied the biogas, the inverted U-shaped pipe can also prevent air from backflowing into the gas transmission pipeline. When the water seal tank is injected with stored water for overpressure protection, the inverted U-shaped pipe can also cooperate with the water in the water seal tank to form a liquid seal. The liquid level of the liquid seal can ensure that the biogas can be discharged from the inverted U-shaped pipe extending into the water seal tank after overpressure. In addition, the U-shaped bend of the inverted U-shaped pipe can be used as a buffer zone. When the gas pressure suddenly increases, part of the gas can be temporarily stored in the top space of the inverted U-shaped pipe, thereby alleviating the impact of instantaneous pressure and effectively improving the stability and safety of the device.

[0017] Preferably, the vent valve is located outside the vent water seal tank and close to the first gas pipeline.

[0018] The vent valve is set on the vent pipe, and the vent pipe does not enter the vent water seal tank. On the one hand, it can effectively control the inflow of biogas and switch the vent valve to the open or closed state in time when needed, effectively improving the safety of the device. On the other hand, it can make it easier for operators to approach the vent valve, facilitate daily operation and inspection, and in an emergency, the vent valve can also be quickly opened or closed, effectively improving the emergency response capability of the device.

[0019] In addition, since biogas contains flammable gases, when the vent pipe is connected to the gas transmission pipe and is filled with biogas, it is difficult to empty the biogas in the vent pipe, which is not conducive to improving the safety of the device. The vent valve arranged on the vent pipe and close to the gas transmission pipe can not only further enhance the effect of the above-mentioned vent valve, but also more conveniently and fully empty the gas in the vent pipe, reduce the gas exchange between the gas transmission pipe and the vent pipe when the vent valve is closed, and reduce the travel of biogas in the device pipeline network, so as to improve the efficiency and stability of biogas transportation in the device.

[0020] Preferably, there are at least two booster fans, and the two booster fans are arranged in parallel.

[0021] If a single booster fan fails, the entire plant needs to be shut down for repairs, affecting operational efficiency. By installing at least two booster fans in parallel, at least one booster fan can be in operation and the other in standby. If the active booster fan fails, the standby fan can be switched to, without affecting the biogas recovery process and effectively improving the operating efficiency of the plant.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] The device has a simple overall structure and low production costs. It utilizes a first and second water seal tank for dual water sealing and pressure stabilization. This allows for regulation of the biogas pressure within the device, ensuring stable pressure even with changes in biogas production. It also isolates air, removes impurities from the biogas, and prevents backfire and backflow, effectively improving the stability and safety of the device during biogas recovery. The use of an overpressure air defense module eliminates the need for shut-off valves, safety valves, and other accessories to achieve automatic overpressure venting. This significantly simplifies the device structure and biogas recovery process, reduces equipment investment costs, and further improves the stability and safety of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a structural diagram of a new type of biogas recovery device.

[0026] Icons: 10-biogas generator; 11-anaerobic reactor; 12-gas-water separator; 20-overpressure venting module; 21-venting pipe; 211-venting valve; 22-venting water seal tank; 30-first water seal tank; 40-boosting fan; 50-second water seal tank; 60-incinerator; 70-first gas pipeline; 71-second gas pipeline; 72-third gas pipeline; 73-fourth gas pipeline. DETAILED DESCRIPTION

[0027] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0028] In the description of the present invention, it should be understood that terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 a limitation on the present invention.

[0029] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0030] In the present embodiment, please refer to Figure 1 The present application provides a novel biogas recovery device, comprising a biogas recovery module and an overpressure venting module 20; the biogas recovery module comprises a biogas generator 10, a booster fan 40 and an incinerator 60, a first water seal tank 30 is arranged between the biogas generator 10 and the booster fan 40, a second water seal tank 50 is arranged between the booster fan 40 and the incinerator 60, and the biogas generator 10 is communicated with the first water seal tank 30 through a first gas conveying pipeline 70. The overpressure venting module 20 comprises a gas discharging pipeline 21, a venting valve 211 and a venting water seal tank 22, one end of the gas discharging pipeline 21 is communicated with the first gas conveying pipeline 70, the other end is communicated with the inside of the venting water seal tank 22, the venting valve 211 is arranged on the gas discharging pipeline 21, and a purging valve (not shown) is arranged on the venting water seal tank 22.

[0031] It can be understood that the first water seal tank 30 and the second water seal tank 50 form a double pressure stabilizing system, and the booster fan 40 is arranged therein, so that the first water seal tank 30 and the second water seal tank 50 can adjust and stabilize the pressure of the biogas before and after boosting; the first water seal tank 30 is provided with stored water and forms a water seal through the stored water, the biogas is subjected to secondary gas-liquid separation through the water seal layer, the dry biogas is prevented from being brought by the biogas fan, air can be isolated, the biogas recovery inside the device is avoided from being affected, the booster fan 40 is connected, so that the biogas pressure between the biogas generator and the first water seal tank 30 is maintained stable; the second water seal tank 50 also has the above functions of the first water seal tank 30, so that the biogas pressure between the output end of the booster fan 40 and the input end of the incinerator 60 is maintained stable, and the backflow of the burning biogas from the input end of the incinerator 60 to the output end of the booster fan 40 is also prevented; in addition, the first water seal tank 30 and the second water seal tank 50 can also remove part of impurities in the biogas, and further improve the combustion efficiency of the biogas.

[0032] For the overpressure venting module 20, on the one hand, when the biogas generated by the biogas generator 10 needs to be vented, the water in the venting water seal tank 22 is emptied through the vent valve, and then the venting valve 211 is opened, and the biogas will be discharged directly from the vent pipe 21. On the other hand, when the biogas needs to be recovered into the incinerator 60, the vent valve and the venting valve 211 are kept closed first, and the stored water is injected into the venting water seal tank 22 to make the liquid level meet the venting pressure required by the biogas pipeline network. After waiting for the biogas to be transported to the incinerator 60, the venting valve 211 is opened to complete the commissioning of the venting water seal tank 22. During operation, when the biogas in the first gas pipeline 70 in the device is overpressured, the biogas will pass through the venting pipe 21, break through the water seal of the venting water seal tank 22 and be discharged, thereby preventing the biogas generator 10 from being damaged by overpressure. Therefore, the venting water seal tank 22 can prevent the first gas pipeline 70 from overpressure and damaging the biogas generator 10; combined with the opening and closing of the drain valve and the vent valve 211, the overpressure venting module 20 can be switched between venting and commissioning protection, which is conducive to simplifying the structure of the biogas recovery system and further improving the stability and safety of biogas recovery.

[0033] In addition, in some embodiments, the biogas generator 10, the first water seal tank 30, the second water seal tank 50, the booster fan 40, and the overpressure venting module 20 can all be multiple, which can increase the biogas recovery amount, recovery efficiency, or improve the stability and safety of the device.

[0034] In this embodiment, please refer to Figure 1 As shown, the biogas generator 10 includes an anaerobic reactor 11 and a gas-water separator 12. The top of the anaerobic generator 11 is connected to the gas-water separator 12, that is, the gas-water separator 12 is connected to the output end of the anaerobic generator 11, and the output end of the gas-water separator 12 is connected to the input end of the first water seal tank 30 through a first gas pipeline 70; the output end of the first water seal tank 30 is connected to the input end of the booster fan 40 through a second gas pipeline 71, and the output end of the booster fan 40 is connected to the input end of the second water seal tank 50 through a third gas pipeline 72; the output end of the second water seal tank 50 is connected to the input end of the incinerator 60 through a fourth pipeline 73.

[0035] It can be understood that the anaerobic reactor 11 produces biogas, and the gas-water separator 12 can remove the liquid phase in the biogas, thereby improving the flammability and combustion efficiency of the biogas. After removing the moisture, the dry biogas can reduce corrosion to the device and extend the service life of various components in the device. In addition, the gas-water separator 12 is provided at the output end of the anaerobic reactor 11. It can also prevent the anaerobic reactor 11 from being directly damaged by overpressure of biogas to a certain extent, which is beneficial to improving the safety of the device.

[0036] The booster fan 40 can boost the biogas and improve the flowability of the biogas in the device pipe network. The output end of the first water seal tank 30 is connected with the input end of the booster fan 40, so that the pressure of the biogas before entering the booster fan 40 can be maintained stable, and the boosted biogas can be prevented from backflowing, thereby affecting the operation of the first water seal tank 30 and the biogas generator. After the biogas is boosted by the booster fan 40, the biogas enters the second water seal tank 50 through the output end of the booster fan 40 and the input end of the second water seal tank 50. After entering, the biogas can be prevented from backflowing to the booster fan 40, the pressure of the biogas output by the booster fan 40 can be maintained stable, and the output end of the second water seal tank 50 can stably output the biogas. The biogas stably output by the second water seal tank 50 is transported to the incinerator 60 for combustion to produce heat, which is applied to other processes and procedures. The incinerator 60 can fully combust the biogas, which can effectively reduce the gas consumption of the incinerator 60, improve the biogas recovery efficiency, and reduce the production and processing cost.

[0037] In the embodiment, as shown in Figure 1 , the purge valve is located at the bottom of the vent water seal tank 22, and the gas discharge pipeline 21 extends towards the bottom of the vent water seal tank 22. The gas discharge pipeline 21 is a reverse U-shaped pipeline.

[0038] It can be understood that the vent water seal tank 22 has stored water, which can be naturally discharged from the purge valve by gravity. The liquid level height of the stored water can be adjusted according to the pressure when the biogas in the device is over-pressured. The end of the gas discharge pipeline 21 extends towards the bottom of the vent water seal tank 22, and the liquid level difference in the vent water seal tank 22 is increased, thereby increasing the buffering time of the biogas and increasing the adjustment range of the over-pressured protection of the biogas. One end of the reverse U-shaped pipeline is connected with the gas conveying pipeline 70, and the other end extends to the bottom of the vent water seal tank 22. Both ends extend upwards and are connected by a connecting pipe, so that the entire gas discharge pipeline 21 is in a reverse U-shaped form.

[0039] In addition, in some embodiments, the gas discharge pipeline 21 can also be multiple, which is used for redundancy protection and increases the reliability of the device. The connecting pipe is arc-shaped, which can make the flow of the biogas more gentle and avoid the pressure concentration of the gas discharge pipeline 21.

[0040] In the embodiment, as shown in Figure 1 , the vent valve 211 is located outside the vent water seal tank 22 and close to the first gas conveying pipeline 70.

[0041] It can be understood that the vent valve 211 is set on the vent pipe 21, and the position on the vent pipe 21 that does not enter the vent water seal tank 22 can effectively control the inflow of biogas, timely switch the state of the vent valve 211, and facilitate daily operation and inspection. Specifically, it is set before the vent water seal tank 22, close to the connection between the gas pipeline 70 and the vent pipe 21. In addition to further enhancing the effect of the above-mentioned vent valve 211, it can also more conveniently and fully evacuate the gas in the vent pipe 21, reduce the gas exchange of biogas between the gas pipeline 70 and the vent pipe 21 when the vent valve 211 is closed, and reduce the travel of biogas in the device pipeline network, so as to improve the efficiency and stability of biogas transportation in the device.

[0042] In addition, in some embodiments, there may be multiple vent valves 211 for redundancy protection to increase the reliability of the device.

[0043] In this embodiment, please refer to Figure 1 As shown, there are at least two booster fans 40, and the two booster fans 40 are arranged in parallel.

[0044] As will be appreciated, the booster fan 40 is a biogas fan used to boost the biogas pressure. Failure of a single booster fan 40 would require the entire device to be shut down for repair, impacting operational efficiency. By providing at least two booster fans 40 in parallel, at least one booster fan 40 can be in operation and one in standby. If the active booster fan 40 fails, the standby booster fan 40 can be switched to, without affecting the biogas recovery process and effectively improving the operational efficiency of the device.

[0045] In addition, in some embodiments, pressure transmitters can be set at the input and output ends of the booster fan 40 to measure and monitor pressure changes and understand the operating status of the device so as to detect abnormalities in time, or to cooperate with the drain valve and the vent valve 211 to achieve automatic control.

[0046] The specific application process of this utility model is as follows:

[0047] Biogas recovery process: First, keep the drain valve and the vent valve 211 closed, inject stored water into the vent water seal tank 22 to make the liquid level match the vent pressure required by the biogas network, and start biogas recovery; the biogas generated by the anaerobic reactor enters the gas-water separator 12 for liquid separation, and the separated biogas enters the first water seal tank 30 through the first gas pipeline 70, then enters the booster fan 40 for pressurization, and is then transported to the second water seal tank 50, and finally enters the incinerator 60 for combustion. After the biogas is transported to the incinerator 60, the vent valve 211 is opened. After this, if the biogas network inside the device is over-pressurized, the generated biogas will be discharged from the vent water seal tank 22 through the first gas pipeline 70 and the vent pipe 21, to prevent the biogas network from being over-pressurized and causing damage to the gas-water separator 12 and the anaerobic reactor.

[0048] When venting biogas: directly open the drain valve to drain the water in the drain water seal tank 22, open the drain valve 211, and the biogas separated by the gas-water separator 12 will be directly discharged from the vent pipe 21.

[0049] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new type of biogas recovery device, characterized in that: include: A biogas recovery module and an overpressure venting module; the biogas recovery module includes a biogas generator, a booster fan and an incinerator, a first water seal tank is provided between the biogas generator and the booster fan, a second water seal tank is provided between the booster fan and the incinerator, and the biogas generator and the first water seal tank are connected through a first gas pipeline; the overpressure venting module includes a venting pipe, a venting valve, and a venting water seal tank, one end of the venting pipe is connected to the first gas pipeline, and the other end is connected to the interior of the venting water seal tank, the venting valve is provided on the venting pipe, and a drain valve is provided on the venting water seal tank.

2. A novel biogas recovery device according to claim 1, characterized in that: The biogas generator comprises an anaerobic reactor and a gas-water separator, and the top of the anaerobic generator is connected to the gas-water separator.

3. A novel biogas recovery device according to claim 2, characterized in that: The output end of the gas-water separator is connected to the input end of the first water seal tank through the first gas pipeline, the output end of the first water seal tank is connected to the input end of the booster fan through the second gas pipeline, and the output end of the booster fan is connected to the input end of the second water seal tank through the third gas pipeline.

4. A novel biogas recovery device according to claim 3, characterized in that: The output end of the second water seal tank is connected to the input end of the incinerator through a fourth gas pipeline.

5. A novel biogas recovery device according to claim 1, characterized in that: The drain valve is located at the bottom of the drain water seal tank, and the vent pipe extends toward the bottom of the drain water seal tank.

6. A novel biogas recovery device according to claim 5, characterized in that: The air venting pipe is in an inverted U shape.

7. A novel biogas recovery device according to claim 1, characterized in that: The vent valve is located outside the vent water seal tank and close to the first gas pipeline.

8. A novel biogas recovery device according to any one of claims 1 to 7, characterized in that: There are at least two booster fans, and the two booster fans are arranged in parallel.

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