Energy-saving device for biogas digester by using biogas power generation waste heat

Abstract

The utility model relates to energy -conserving device technical field, concretely is a kind of energy -conserving device for heating biogas pool by biogas power generation waste heat, including heat -preserving outer tank, the inside fixed anaerobic biogas inner tank of heat -preserving outer tank, the side of heat -preserving outer tank top position place is equipped with biogas discharge pipe, the surface of heat -preserving outer tank is equipped with exhaust pipe, the side of heat -preserving outer tank bottom position place is equipped with air inlet pipe, the surface of anaerobic biogas inner tank is provided with inner tank heating mechanism, the inside including of inner tank heating mechanism has gas guide inlet pipe, piston outer cylinder, gas guide outlet pipe, heat conduction pipeline, air inlet valve, air outlet valve and piston inner tube, the surface of inner tank heating mechanism is provided with auxiliary heating mechanism, and auxiliary heating mechanism is composed of heat conduction rod and overturning stirring mechanism.The utility model not only improves the utilization rate of biogas generator set waste heat when energy -conserving device is used, improves the fermentation efficiency when energy -conserving device is used.

Description

Technical Field

[0001] This utility model relates to the field of energy-saving device technology, specifically an energy-saving device that uses waste heat from biogas power generation to heat a biogas digester. Background Technology

[0002] The most common biogas fermentation device today is the biogas digester. In order to increase the fermentation rate of the biogas digester, it is often necessary to heat the biogas digester. The commonly used heating methods are electric heating or boiler heating. Although both of the above heating methods can heat the biogas digester, they consume a lot of energy and are very wasteful. In addition, biogas generator sets usually generate a lot of heat during the power generation process, which also causes waste. Therefore, the waste heat from biogas power generation can be used to heat the biogas digester.

[0003] A search revealed a utility model patent with patent number 201721874924.X, entitled "A Utility Model of an Energy-Saving Device for Heating a Biogas Digester Using Waste Heat from Biogas Power Generation." The device includes a biogas digester, a biogas generator set, and a generator. The biogas digester includes an anaerobic fermentation gas-producing tank with an inlet and an outlet. A biogas discharge pipe is connected to the outlet, and the other end of the pipe is connected to the biogas generator set. The generator set burns biogas to drive the generator and generate electricity. An insulation cavity is provided on the outside of the anaerobic fermentation gas-producing tank, and an insulation pipe is installed inside the cavity. One end of the insulation pipe passes through the outer wall of the anaerobic fermentation gas-producing tank and connects to the biogas generator set.

[0004] Research and analysis revealed that this energy-saving device effectively utilizes the heat generated by the biogas generator set to heat the biogas digester through insulated pipes, reducing heating energy consumption and promoting energy conservation and environmental protection. Simultaneously, the insulated pipes are almost entirely placed inside the insulation cavity, reducing heat loss from the outside of the pipes to the working environment and improving the quality of the working environment. However, it still has some drawbacks: the energy-saving device only heats the outside of the anaerobic fermentation gas production tank by introducing the waste heat from the biogas generator set into the insulation cavity, resulting in a short residence time for the waste heat, low waste heat utilization rate, and poor heating effect. Utility Model Content

[0005] The purpose of this utility model is to provide an energy-saving device that uses waste heat from biogas power generation to heat a biogas digester, so as to solve the problems of low waste heat utilization rate and poor heating effect when using the energy-saving device mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an energy-saving device for heating a biogas digester using waste heat from biogas power generation, comprising an insulated outer tank, a control panel mounted on the surface of the insulated outer tank, an anaerobic biogas inner tank fixed inside the insulated outer tank, a biogas discharge pipe mounted on one side of the top of the insulated outer tank, one end of the biogas discharge pipe extending into the interior of the anaerobic biogas inner tank, an exhaust pipe mounted on the surface of the insulated outer tank, one end of the exhaust pipe penetrating the insulated outer tank and extending to the outside of the anaerobic biogas inner tank, and an air inlet pipe mounted on one side of the bottom of the insulated outer tank. One end of the device penetrates through the outer insulated tank and extends to the outside of the inner anaerobic biogas tank. An inlet is provided at the top of the outer insulated tank, which is connected to the inner anaerobic biogas tank. The surface of the inlet is covered with a sealing cap, which is detachably connected to the outer insulated tank by screws. The surface of the inner anaerobic biogas tank is provided with an inner tank heating mechanism. The interior of the inner tank heating mechanism includes a gas inlet pipe, an outer piston cylinder, a gas outlet pipe, a heat conduction pipe, an inlet valve, an outlet valve, and an inner piston cylinder. The surface of the inner tank heating mechanism is provided with an auxiliary heating mechanism, which consists of a heat conduction rod and a stirring mechanism.

[0007] Preferably, a piston outer cylinder is fixed at the center of the bottom of the anaerobic biogas inner tank. One end of the piston outer cylinder extends to the outside of the anaerobic biogas inner tank and is fixed with a gas inlet pipe. An air inlet valve is installed on the surface of the air inlet pipe, and the input end of the air inlet valve is electrically connected to the output end of the control panel.

[0008] Preferably, a gas outlet pipe is fixed on one side of the piston outer cylinder, one end of the gas outlet pipe passes through the heat-insulating outer tank and extends to the outside of the heat-insulating outer tank, and a gas outlet valve is installed on the surface of the gas outlet pipe. The input end of the gas outlet valve is electrically connected to the output end of the control panel.

[0009] Preferably, the piston outer cylinder is provided with a piston inner tube, the piston inner tube has a hollow structure, the piston inner tube and the piston outer cylinder slide together, one end of the piston outer cylinder is sealed to the surface of the piston inner tube, and a heat conduction pipe is fixed to one end of the piston inner tube. The heat conduction pipe has a hollow structure and is connected to the piston inner tube.

[0010] Preferably, the interior of the anaerobic biogas tank is equipped with a heat-conducting rod. The heat-conducting rod has a hollow structure and is fixed circumferentially to the surface of the piston outer cylinder. The heat-conducting rod is connected to the piston outer cylinder.

[0011] Preferably, a stirring mechanism is provided above the heat-conducting rod, and the stirring mechanism includes a stirring rod, a rack and a half gear.

[0012] Preferably, a stirring rod is provided on the outer side of the top position of the piston outer cylinder, and a half gear is fixed at one end of the stirring rod. The half gear is rotatably connected to the surface of the piston outer cylinder through a bracket.

[0013] Preferably, the racks are fixed to the bottom of the heat-conducting pipes, and the racks mesh with the half gears.

[0014] Compared with existing technologies, the beneficial effects of this utility model are as follows: This energy-saving device for heating a biogas digester using waste heat from biogas power generation is equipped with an inner tank heating mechanism and an auxiliary heating mechanism. By opening the air inlet valve via the control panel, some heat enters the piston outer cylinder through the air inlet pipe and then through the piston inner tube into the heat conduction pipe. The heat conduction pipe heats the material inside the anaerobic biogas inner tank. Subsequently, the heat continues to enter, lifting the piston inner tube and causing it to move upwards along the piston outer cylinder, synchronously moving the heat conduction pipe. This allows the heat conduction pipe to heat the material at different locations, accelerating fermentation. Then, the control panel can be used to open the air outlet valve on the surface of the air outlet pipe, venting the gas inside the piston outer cylinder. The piston inner tube then falls under its own gravity. During use, the opening degree of the air inlet and outlet valves can be adjusted via the control panel to regulate the air intake and exhaust volume inside the piston outer cylinder. When the gas intake in the inlet pipe is greater than the gas output in the outlet pipe, the gas inside the piston outer cylinder increases, causing the heat-conducting pipe to rise. Conversely, the gas output decreases, causing the heat-conducting pipe to fall. During operation, the inlet and outlet valves can be controlled via the control panel to make the heat-conducting pipe reciprocate linearly, heating the material. This allows the energy-saving device to utilize the waste heat to heat the material inside the anaerobic biogas tank. Simultaneously, as the heat-conducting pipe rises, it drives the rack to move linearly upwards. The meshing of the rack and half-gear drives the stirring rod to rotate, causing it to stir the material and improve the fermentation effect. When the piston inner pipe rises above the heat-conducting rod, some heat enters the rod and heats the material, providing auxiliary heating for the energy-saving device. This improves the utilization rate of waste heat from the biogas generator set and increases the fermentation efficiency of the device. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the front cross-sectional structure of this utility model; Figure 3 This is a schematic diagram of the working structure of the inner tank heating mechanism of this utility model; Figure 4 This is a three-dimensional enlarged structural schematic diagram of the inner tank heating mechanism of this utility model.

[0016] In the diagram: 1. Insulated outer tank; 11. Control panel; 12. Exhaust pipe; 13. Biogas discharge pipe; 14. Inlet pipe; 15. Anaerobic biogas inner tank; 16. Feed inlet; 2. Inner tank heating mechanism; 21. Gas inlet pipe; 22. Piston outer cylinder; 23. Gas outlet pipe; 24. Heat conduction pipe; 25. Inlet valve; 26. Outlet valve; 27. Piston inner tube; 3. Auxiliary heating mechanism; 31. Heat conduction rod; 32. Stirring mechanism; 321. Stirring rod; 322. Rack; 323. Half gear. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. In addition, the terms "first", "second", "third", "upper", "lower", "left", "right", etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance. At the same time, in the description of the present utility model, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. 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 an indirect connection through an intermediate medium. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0018] The structure of the energy-saving device for heating a biogas digester using waste heat from biogas power generation provided by this utility model is as follows: Figure 1 and Figure 2 As shown, the system includes an insulated outer tank 1, with a control panel 11 mounted on its surface. The control panel 11 contains an embedded lithium battery and a processor. The processor includes an amplifier tube, a protective resistor Rm, a filter, an A / D converter, and a microcontroller. A sensor and the protective resistor Rm are connected in parallel with the amplifier tube and then in series with the filter. The signal is converted by the A / D converter and sent to the microcontroller. The display screen receives the processing signals from the microcontroller. An anaerobic biogas inner tank 15 is fixed inside the insulated outer tank 1. A biogas discharge pipe 13 is installed on one side of the top of the insulated outer tank 1. One end of 13 extends into the interior of the anaerobic biogas inner tank 15. An exhaust pipe 12 is installed on the surface of the heat-insulating outer tank 1. One end of the exhaust pipe 12 passes through the heat-insulating outer tank 1 and extends to the outside of the anaerobic biogas inner tank 15. An air inlet pipe 14 is installed on one side at the bottom of the heat-insulating outer tank 1. One end of the air inlet pipe 14 passes through the heat-insulating outer tank 1 and extends to the outside of the anaerobic biogas inner tank 15. A feed inlet 16 is opened at the top of the heat-insulating outer tank 1. The feed inlet 16 is connected to the anaerobic biogas inner tank 15. The surface of the feed inlet 16 is covered with a sealing cap. The sealing cap is detachably connected to the heat-insulating outer tank 1 by screws.

[0019] Furthermore, such as Figure 2 , Figure 3 and Figure 4 As shown, the surface of the anaerobic biogas inner tank 15 is provided with an inner tank heating mechanism 2. The inner tank heating mechanism 2 includes a gas inlet pipe 21, a piston outer cylinder 22, a gas outlet pipe 23, a heat conduction pipe 24, an inlet valve 25, an outlet valve 26, and a piston inner tube 27. The piston outer cylinder 22 is fixed at the center of the bottom of the anaerobic biogas inner tank 15. One end of the piston outer cylinder 22 extends to the outside of the anaerobic biogas inner tank 15 and is fixed with the gas inlet pipe 21. The surface of the gas inlet pipe 21 is equipped with an inlet valve 25. The model of the inlet valve 25 can be a TM series solenoid valve. The input end of the inlet valve 25 is electrically connected to the output end of the control panel 11. A gas outlet valve is fixed on one side of the piston outer cylinder 22. The outlet pipe 23 has one end that passes through the outer insulated tank 1 and extends to the outside of the outer insulated tank 1. An outlet valve 26 is installed on the surface of the outlet pipe 23. The outlet valve 26 can be a TM series solenoid valve. The input end of the outlet valve 26 is electrically connected to the output end of the control panel 11. The piston outer cylinder 22 is provided with a piston inner tube 27. The piston inner tube 27 has a hollow structure. The piston inner tube 27 and the piston outer cylinder 22 slide against each other. One end of the piston outer cylinder 22 is sealed to the surface of the piston inner tube 27. A heat conduction pipe 24 is fixed to one end of the piston inner tube 27. The heat conduction pipe 24 has a hollow structure and is connected to the piston inner tube 27.

[0020] In use, the air inlet valve 25 is opened via the control panel 11, allowing some heat to enter the piston outer cylinder 22 through the air inlet pipe 21 and then through the piston inner pipe 27 into the heat conduction pipe 24. The heat conduction pipe 24 heats the material inside the anaerobic biogas tank 15. Subsequently, as more heat enters, it lifts the piston inner pipe 27, causing it to move upwards along the piston outer cylinder 22. This moves the heat conduction pipe 24 synchronously, allowing it to heat the material at different locations and accelerate fermentation. Afterwards, the air outlet valve 26 on the surface of the air outlet pipe 23 is opened via the control panel 11 to release the gas inside the piston outer cylinder 22. The piston inner tube 27 falls under its own gravity. During use, the opening degree of the air inlet valve 25 and the air outlet valve 26 can be adjusted through the control panel 11 to adjust the air intake and exhaust volume inside the piston outer cylinder 22. When the air intake volume in the air inlet pipe 21 is greater than the air exhaust volume in the air outlet pipe 23, the gas inside the piston outer cylinder 22 increases, causing the heat conduction pipe 24 to rise. Conversely, the gas inside the piston outer cylinder 22 decreases, causing the heat conduction pipe 24 to fall. During use, the air inlet valve 25 and the air outlet valve 26 can be controlled through the control panel 11 to make the heat conduction pipe 24 reciprocate linearly to heat the material, so as to realize the function of the energy-saving device to heat the material inside the anaerobic biogas inner tank 15 by utilizing the waste heat entering.

[0021] Furthermore, such as Figure 3 and Figure 4 As shown, an auxiliary heating mechanism 3 is provided on the surface of the inner tank heating mechanism 2. The auxiliary heating mechanism 3 consists of a heat-conducting rod 31 and a stirring mechanism 32. The anaerobic biogas inner tank 15 is equipped with a heat-conducting rod 31 inside. The heat-conducting rod 31 has a hollow structure and is fixed circumferentially on the surface of the piston outer cylinder 22. The heat-conducting rod 31 is connected to the piston outer cylinder 22. A stirring mechanism 32 is provided above the heat-conducting rod 31. The stirring mechanism 32 includes a stirring rod 321, a rack 322, and a half gear 323. A stirring rod 321 is provided on the outer side of the top position of the piston outer cylinder 22. A half gear 323 is fixed to one end of the stirring rod 321. The half gear 323 is rotatably connected to the surface of the piston outer cylinder 22 through a bracket. The rack 322 is fixed to the bottom of the heat-conducting pipe 24. The rack 322 and the half gear 323 mesh with each other.

[0022] In use, when the heat-conducting pipe 24 rises, it drives the rack 322 to move in a straight line. Under the meshing action of the rack 322 and the half gear 323, it drives the stirring rod 321 to rotate, so that the stirring rod 321 stirs the material and improves the fermentation effect. At the same time, when the piston inner tube 27 rises above the heat-conducting rod 31, some heat enters the interior of the heat-conducting rod 31 and heats the material under the action of the heat-conducting rod 31, so as to realize the auxiliary heating function of the energy-saving device, thereby improving the utilization rate of waste heat of the biogas generator set when the energy-saving device is used and improving the fermentation efficiency when the energy-saving device is used.

[0023] Working principle: When in use, the biogas material is first poured into the anaerobic biogas inner tank 15 through the feed inlet 16. Then, the sealing cap is sealed on the surface of the feed inlet 16 with screws. After a period of time, the material ferments and produces biogas. The biogas is introduced into the biogas generator set through the biogas discharge pipe 13. The biogas generator set burns the biogas to drive the generator to generate electricity. At the same time, the heat generated by the biogas generator set is directly introduced into the air inlet pipe 14 to heat the anaerobic biogas inner tank 15 to improve the fermentation efficiency.

[0024] Simultaneously, the air inlet valve 25 can be opened via the control panel 11, allowing some heat to enter the piston outer cylinder 22 through the air inlet pipe 21 and then through the piston inner pipe 27 into the heat conduction pipe 24. The heat conduction pipe 24 heats the material inside the anaerobic biogas tank 15. Subsequently, the heat continues to enter, lifting the piston inner pipe 27 and causing it to move upwards along the piston outer cylinder 22. This moves the heat conduction pipe 24 synchronously, allowing it to heat the material at different locations and accelerate fermentation. Afterwards, the air outlet valve 26 on the surface of the air outlet pipe 23 can be opened via the control panel 11 to discharge the gas inside the piston outer cylinder 22. The piston inner tube 27 falls under its own gravity. During use, the opening degree of the air inlet valve 25 and the air outlet valve 26 can be adjusted through the control panel 11 to adjust the air intake and exhaust volume inside the piston outer cylinder 22. When the air intake volume in the air inlet pipe 21 is greater than the air exhaust volume in the air outlet pipe 23, the gas inside the piston outer cylinder 22 increases, causing the heat conduction pipe 24 to rise. Conversely, the gas inside the piston outer cylinder 22 decreases, causing the heat conduction pipe 24 to fall. During use, the air inlet valve 25 and the air outlet valve 26 can be controlled through the control panel 11 to make the heat conduction pipe 24 reciprocate linearly to heat the material, so as to realize the function of the energy-saving device to heat the material inside the anaerobic biogas inner tank 15 by utilizing the waste heat entering.

[0025] Simultaneously, when the heat-conducting pipe 24 rises, it drives the rack 322 to move linearly upward. Under the meshing action of the rack 322 and the half gear 323, it drives the stirring rod 321 to rotate, causing the stirring rod 321 to stir the material and improve the fermentation effect. At the same time, when the piston inner tube 27 rises above the heat-conducting rod 31, some heat enters the interior of the heat-conducting rod 31 and heats the material under the action of the heat-conducting rod 31, so as to realize the auxiliary heating function of the energy-saving device. This improves the utilization rate of waste heat of the biogas generator set when the energy-saving device is used, improves the fermentation efficiency when the energy-saving device is used, and finally completes the use of the energy-saving device.

[0026] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An energy-saving device for heating a biogas digester using waste heat from biogas power generation, comprising an insulated outer tank (1), characterized in that: A control panel (11) is installed on the surface of the insulated outer tank (1). An anaerobic biogas inner tank (15) is fixed inside the insulated outer tank (1). A biogas discharge pipe (13) is installed on one side of the top of the insulated outer tank (1). One end of the biogas discharge pipe (13) extends into the interior of the anaerobic biogas inner tank (15). An exhaust pipe (12) is installed on the surface of the insulated outer tank (1). One end of the exhaust pipe (12) passes through the insulated outer tank (1) and extends to the outside of the anaerobic biogas inner tank (15). An air inlet pipe (14) is installed on one side of the bottom of the insulated outer tank (1). One end of the air inlet pipe (14) passes through the insulated outer tank (1) and extends to the outside of the anaerobic biogas inner tank (15). An inlet (16) is provided at the top of the anaerobic biogas tank (15). The inlet (16) is connected to the inner tank (15) of the anaerobic biogas tank. The surface of the inlet (16) is covered with a sealing cover. The sealing cover is connected to the outer tank (1) of the heat-insulating tank by screws. The surface of the inner tank (15) of the anaerobic biogas tank is provided with an inner tank heating mechanism (2). The inner tank heating mechanism (2) includes a gas inlet pipe (21), a piston outer cylinder (22), a gas outlet pipe (23), a heat conduction pipe (24), an air inlet valve (25), an air outlet valve (26), and a piston inner pipe (27). The surface of the inner tank heating mechanism (2) is provided with an auxiliary heating mechanism (3). The auxiliary heating mechanism (3) consists of a heat conduction rod (31) and a stirring mechanism (32).

2. The energy-saving device for heating a biogas digester using waste heat from biogas power generation according to claim 1, characterized in that: A piston outer cylinder (22) is fixed at the center of the bottom of the anaerobic biogas inner tank (15). One end of the piston outer cylinder (22) extends to the outside of the anaerobic biogas inner tank (15) and is fixed with a gas inlet pipe (21). An air inlet valve (25) is installed on the surface of the air inlet pipe (21). The input end of the air inlet valve (25) is electrically connected to the output end of the control panel (11).

3. The energy-saving device for heating a biogas digester using waste heat from biogas power generation according to claim 2, characterized in that: A gas outlet pipe (23) is fixed on one side of the piston outer cylinder (22). One end of the gas outlet pipe (23) passes through the heat-insulating outer tank (1) and extends to the outside of the heat-insulating outer tank (1). A gas outlet valve (26) is installed on the surface of the gas outlet pipe (23). The input end of the gas outlet valve (26) is electrically connected to the output end of the control panel (11).

4. An energy-saving device for heating a biogas digester using waste heat from biogas power generation, as described in claim 3, is characterized in that: The piston outer cylinder (22) is provided with a piston inner tube (27) inside. The piston inner tube (27) has a hollow structure. The piston inner tube (27) and the piston outer cylinder (22) slide together. One end of the piston outer cylinder (22) is sealed to the surface of the piston inner tube (27). One end of the piston inner tube (27) is fixed with a heat conduction pipe (24). The heat conduction pipe (24) has a hollow structure and is connected to the piston inner tube (27).

5. An energy-saving device for heating a biogas digester using waste heat from biogas power generation, as described in claim 1, characterized in that: The anaerobic biogas tank (15) is equipped with a heat-conducting rod (31) inside. The heat-conducting rod (31) has a hollow structure and is fixed circumferentially to the surface of the piston outer cylinder (22). The heat-conducting rod (31) is connected to the piston outer cylinder (22).

6. An energy-saving device for heating a biogas digester using waste heat from biogas power generation, as described in claim 5, is characterized in that: A stirring mechanism (32) is provided above the heat-conducting rod (31). The stirring mechanism (32) contains a stirring rod (321), a rack (322), and a half gear (323).

7. An energy-saving device for heating a biogas digester using waste heat from biogas power generation, as described in claim 6, is characterized in that: A stirring rod (321) is provided on the outer side of the top position of the piston outer cylinder (22). A half gear (323) is fixed at one end of the stirring rod (321). The half gear (323) is rotatably connected to the surface of the piston outer cylinder (22) through a bracket.

8. An energy-saving device for heating a biogas digester using waste heat from biogas power generation, as described in claim 7, characterized in that: The rack (322) is fixed to the bottom of the heat-conducting pipe (24), and the rack (322) meshes with the half gear (323).

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