Energy-saving device for biogas digester by using biogas power generation waste heat
By designing an energy-saving device that uses waste heat from biogas power generation to heat a biogas digester, the problem of unused waste heat from flue gas was solved, achieving efficient recovery of waste heat and energy conservation, reducing operating costs and environmental pollution.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG NORTH IND TECHNOLOGY CO LTD
- Filing Date
- 2025-07-22
- Publication Date
- 2026-05-29
AI Technical Summary
In traditional biogas power generation, the waste heat from the flue gas is not effectively utilized, resulting in energy waste. Furthermore, traditional heating methods consume additional energy, increasing operating costs and potentially causing environmental pollution.
Design an energy-saving device that uses waste heat from biogas power generation to heat a biogas digester. Through the cooperation of heat exchange pipes, liquid inlet pipes, liquid outlet pipes and water pumps, the waste heat from the flue gas generated by biogas power generation is recovered for heating. Combined with a dust filtration and cleaning system, the heat is effectively transferred and pollution is reduced.
It achieves efficient recovery and utilization of waste heat from biogas power generation, improves energy utilization efficiency, reduces operating costs, and reduces environmental pollution by purifying flue gas.
Smart Images
Figure CN224302839U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of biogas energy utilization technology, specifically an energy-saving device that uses waste heat from biogas power generation to heat a biogas digester. Background Technology
[0002] In the current energy utilization system, biogas has been widely used as a clean energy source. Biogas power generation is a technology that converts biogas into electricity, which has multiple advantages such as environmental protection, energy saving, and resource recycling. The biogas fermentation process is relatively sensitive to temperature, and a suitable temperature can significantly improve the biogas fermentation efficiency and gas production rate.
[0003] However, in the traditional biogas power generation process, the flue gas produced contains a large amount of heat, and this large amount of waste heat is usually directly discharged into the external environment, resulting in a huge waste of energy. Traditional biogas digester heating methods mostly use electric heating, coal heating, etc., which not only consume a lot of additional energy and increase operating costs, but may also cause certain pollution to the environment.
[0004] To address these issues, we have developed an energy-saving device that uses waste heat from biogas power generation to heat the biogas digester. Utility Model Content
[0005] 1) Technical problems to be solved
[0006] This utility model proposes an energy-saving device for heating a biogas digester using waste heat from biogas power generation. Through the coordination of heat exchange pipes, liquid inlet pipes, liquid outlet pipes, and water pumps, it solves the problem of energy waste caused by the ineffective utilization of waste heat from flue gas during traditional biogas power generation, thereby reducing the additional energy consumption of traditional heating methods and lowering operating costs.
[0007] (ii) Technical Solution
[0008] 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 a heat exchange plate, wherein heat exchange tubes are uniformly connected inside the heat exchange plate, gas channels are formed between adjacent heat exchange tubes, and fins are uniformly connected to the outer ends of the heat exchange tubes.
[0009] One side of the heat exchange plate is connected to a liquid inlet pipe, and the other side is connected to a liquid outlet pipe. The two ends of the heat exchange tube are respectively connected to the liquid inlet pipe and the liquid outlet pipe.
[0010] A water pump is connected to the side end of the inlet pipe, and the pumping end of the water pump and the outlet pipe are respectively connected to the heating equipment of the biogas digester.
[0011] The heat exchange plate is connected to an exhaust duct at the upper end near the liquid inlet pipe and an ash discharge duct at the lower end.
[0012] A dust filter plate is installed inside the exhaust duct, and a collection box is installed at the lower end of the ash discharge duct;
[0013] The heat exchange plate is connected to an air inlet near the lower end of the drain pipe, and an air inlet pipe is connected to the lower end of the air inlet.
[0014] Furthermore, the outer shell of the heat exchange plate is made of an alloy that is resistant to high temperatures and corrosion and has poor thermal conductivity, while the heat exchange tubes and fins are made of an alloy with good thermal conductivity.
[0015] Furthermore, the drain end of the water pump is connected to the liquid inlet pipe, and the exhaust duct and ash discharge duct are internally connected to the heat exchange plate.
[0016] Furthermore, the air intake duct is connected to the heat exchange plate, and the air intake pipe is connected to the flue gas pipe of the biogas power generation equipment.
[0017] Furthermore, the heat exchange tube section at the upper end of the ash discharge channel has no fins at its outer end, and the upper end of the heat exchange tube is set as an inclined surface.
[0018] Furthermore, there is a gap between the heat exchange tube and the top plate of the heat exchange plate, and a cleaning plate is slidably connected inside the heat exchange plate, the cleaning plate being slidably connected to the outer end of the heat exchange tube and fins.
[0019] Furthermore, a threaded rod is rotatably connected inside the heat exchange plate, the cleaning plate is threadedly connected to the outer end of the threaded rod, a servo motor is connected to the side end of the heat exchange plate, and the drive end of the servo motor is connected to the threaded rod.
[0020] (iii) Beneficial effects:
[0021] Compared with existing technologies, this energy-saving device for heating a biogas digester using waste heat from biogas power generation has the following advantages:
[0022] Beneficial effects:
[0023] I. This energy-saving device for heating a biogas digester using waste heat from biogas power generation, equipped with heat exchange pipes, inlet pipes, outlet pipes, and a water pump, can recover waste heat generated during biogas power generation and use it to heat the biogas digester. Specifically, the flue gas generated by the biogas power generation equipment enters the heat exchange plate through the inlet duct. The flue gas moves within the heat exchange plate, and its internal heat is exchanged with the medium inside the heat exchange pipes through the fins and heat exchange pipes, thereby heating the medium. The medium circulates between the heat exchange plate and the biogas digester heating equipment through the inlet and outlet pipes, thus heating the biogas digester. Therefore, this device can recover and utilize the waste heat from the flue gas generated by the biogas power generation equipment, which can improve the energy utilization efficiency of the entire biogas power generation system, while reducing the additional energy consumption of traditional heating methods, reducing operating costs, and having a significant energy-saving effect.
[0024] II. This energy-saving device for heating a biogas digester using waste heat from biogas power generation features an exhaust duct and a dust filter plate. Flue gas exits the heat exchange plate through the exhaust duct, and the dust filter plate adsorbs dust particles in the flue gas, preventing pollution of the surrounding environment. A cleaning plate and a threaded rod are also included. When a servo motor is activated, the threaded rod rotates, interacting with the cleaning plate to move it within the heat exchange plate. This pushes away accumulated dust within the heat exchange plate, which then falls into a collection box through the ash discharge duct. This prevents excessive dust accumulation at the outer end of the heat exchange tubes, thus avoiding reduced heat exchange efficiency. Attached Figure Description
[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.
[0026] Figure 1 This is a schematic diagram of the overall structure of the energy-saving device of this utility model that uses waste heat from biogas power generation to heat the biogas digester;
[0027] Figure 2 This is a schematic diagram of the heat exchanger tube structure of the energy-saving device of this utility model that uses waste heat from biogas power generation to heat the biogas digester.
[0028] Figure 3 This is a schematic diagram of the cleaning plate structure of the energy-saving device of this utility model that uses waste heat from biogas power generation to heat the biogas digester;
[0029] Figure 4 This is a side cross-sectional view of the energy-saving device of this utility model that uses waste heat from biogas power generation to heat a biogas digester.
[0030] Figure 5 This is a top-view cross-sectional structural diagram of the energy-saving device of this utility model that uses waste heat from biogas power generation to heat a biogas digester.
[0031] In the diagram: 1. Heat exchange plate; 2. Heat exchange tube; 3. Fin; 4. Liquid inlet pipe; 5. Liquid outlet pipe; 6. Water pump; 7. Exhaust duct; 8. Ash discharge duct; 9. Dust filter plate; 10. Collection box; 11. Air inlet duct; 12. Air inlet pipe; 13. Cleaning plate; 14. Threaded rod; 15. Servo motor. Detailed Implementation
[0032] 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, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0033] like Figures 1-5 As shown, this utility model provides a technical solution: an energy-saving device for heating a biogas digester using waste heat from biogas power generation, including a heat exchange plate 1. The outer shell of the heat exchange plate 1 is made of an alloy that is resistant to high temperatures and corrosion and has poor thermal conductivity, thereby reducing the heat transfer to the outside through the heat exchange plate 1 and giving the heat exchange plate 1 a heat preservation effect. Heat exchange tubes 2 are uniformly connected inside the heat exchange plate 1, and air passages are formed between adjacent heat exchange tubes 2. Fins 3 are uniformly connected to the outer end of the heat exchange tubes 2. The fins 3 are used to increase the heat exchange area of the heat exchange tubes 2. The heat exchange tubes 2 and fins 3 are made of an alloy with good thermal conductivity, thereby facilitating heat exchange between the fins 3, the heat exchange tubes 2 and the medium inside the heat exchange tubes 2.
[0034] One side of the heat exchange plate 1 is connected to the liquid inlet pipe 4, and the other side is connected to the liquid outlet pipe 5. The two ends of the heat exchange tube 2 are connected to the liquid inlet pipe 4 and the liquid outlet pipe 5 respectively, so that the medium can enter the heat exchange tube 2 from the liquid inlet pipe 4 and then be discharged from the liquid outlet pipe 5. The side end of the liquid inlet pipe 4 is connected to the water pump 6. The water pump 6 and the liquid outlet pipe 5 are connected to the heating equipment of the biogas digester respectively, so that the heated medium can be transported to the heating equipment of the biogas digester. The water pump 6 and the drain end are connected to the liquid inlet pipe 4.
[0035] The lower end of the heat exchange plate 1 near the drain pipe 5 is connected to an air inlet 11, which is connected to the heat exchange plate 1. The lower end of the air inlet 11 is connected to an air inlet pipe 12, which is connected to the flue gas pipe of the biogas power generation equipment. Thus, the flue gas generated by the biogas power generation equipment can enter the heat exchange plate 1 through the air inlet pipe 12 and the air inlet 11.
[0036] The heat exchange plate 1 is connected to an exhaust duct 7 at its upper end near the liquid inlet pipe 4 and to an ash discharge duct 8 at its lower end. The exhaust duct 7 and the ash discharge duct 8 are internally connected to the heat exchange plate 1. A dust filter plate 9 is installed inside the exhaust duct 7, and the flue gas can be discharged through the exhaust duct 7. The dust filter plate 9 is used to adsorb dust in the flue gas. A collection box 10 is installed at the lower end of the ash discharge duct 8, and the collection box 10 is used to collect flue gas dust.
[0037] There is a gap between the heat exchange tube 2 and the top plate of the heat exchange plate 1. A cleaning plate 13 is slidably connected inside the heat exchange plate 1. The cleaning plate 13 is slidably connected to the outer end of the heat exchange tube 2 and the fins 3, and is slidably connected in the gap between the heat exchange tube 2 and the heat exchange plate 1. A threaded rod 14 is rotatably connected inside the heat exchange plate 1. The cleaning plate 13 is threadedly connected to the outer end of the threaded rod 14. A servo motor 15 is connected to the side end of the heat exchange plate 1. The drive end of the servo motor 15 is connected to the threaded rod 14. When the servo motor 15 is started, it will drive the threaded rod 14 to rotate. The rotation of the threaded rod 14 will drive the cleaning plate 13 to move. The heat exchange tube 2 section at the upper end of the ash discharge channel 8 has no fins 3 at its outer end, and the upper end of the heat exchange tube 2 is set as an inclined surface. In this way, when the cleaning plate 13 moves to the upper end of the ash discharge channel 8, the dust on the fins 3 can fall into the ash discharge channel 8.
[0038] Working principle: During operation, the flue gas generated by the biogas power generation equipment enters the intake duct 11 through the intake pipe 12, and then enters the heat exchange plate 1 through the intake duct 11. The flue gas can move within the heat exchange plate 1, and the heat in the flue gas exchanges heat with the fins 3 and heat exchange tubes 2, thereby heating the medium inside the heat exchange tubes 2. When the water pump 6 starts, the medium enters the heat exchange tubes 2 through the liquid inlet pipe 4. The medium inside the heat exchange tubes 2 is heated by the heat in the flue gas, and then injected into the heating equipment of the biogas digester through the liquid outlet pipe 5. The medium then flows back to the liquid inlet pipe 4 through the water pump 6, thus circulating and heating the biogas digester. The flue gas undergoes heat exchange... The flue gas moves within the heat exchange plate 1 and is eventually discharged through the exhaust duct 7. The dust filter plate 9 inside the exhaust duct 7 adsorbs dust particles in the flue gas, thereby purifying the flue gas and preventing pollution of the surrounding environment. By starting the servo motor 15, it will drive the threaded rod 14 to rotate. The rotation of the threaded rod 14 interacts with the cleaning plate 13, which will enable the cleaning plate 13 to move within the heat exchange plate 1, thereby pushing the dust on the inner wall of the heat exchange plate 1, the heat exchange tube 2, and the outer end of the fins 3. Finally, the dust will fall into the collection box 10 along the ash discharge duct 8, thus cleaning the heat exchange plate 1. Through regular cleaning, the accumulation of dust is reduced, ensuring that the heat of the flue gas can be efficiently transferred to the medium.
[0039] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0040] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.
Claims
1. An energy-saving device for heating a biogas digester using waste heat from biogas power generation, comprising a heat exchange plate (1), characterized in that: The heat exchange plate (1) is uniformly connected with heat exchange tubes (2), and air passages are formed between adjacent heat exchange tubes (2). Fins (3) are uniformly connected to the outer end of the heat exchange tubes (2). One side of the heat exchange plate (1) is connected to the liquid inlet pipe (4), and the other side is connected to the liquid outlet pipe (5). The two ends of the heat exchange tube (2) are connected to the liquid inlet pipe (4) and the liquid outlet pipe (5) respectively. The side end of the liquid inlet pipe (4) is connected to a water pump (6), and the water pump (6) and the liquid outlet pipe (5) are respectively connected to the heating equipment of the biogas digester. The heat exchange plate (1) is connected to an exhaust duct (7) at its upper end near the liquid inlet pipe (4) and to an ash discharge duct (8) at its lower end. A dust filter plate (9) is provided inside the exhaust duct (7), and a collection box (10) is provided at the lower end of the ash discharge duct (8); The heat exchange plate (1) is connected to an air inlet (11) at the lower end near the drain pipe (5), and the lower end of the air inlet (11) is connected to an air inlet pipe (12).
2. The energy-saving device for heating a biogas digester using waste heat from biogas power generation according to claim 1, characterized in that: The outer shell of the heat exchange plate (1) is made of an alloy that is resistant to high temperature and corrosion and has poor thermal conductivity, while the heat exchange tube (2) and fins (3) are made of an alloy with good thermal conductivity.
3. The energy-saving device for heating a biogas digester using waste heat from biogas power generation according to claim 1, characterized in that: The drain end of the water pump (6) is connected to the liquid inlet pipe (4), and the exhaust duct (7) and ash discharge duct (8) are both internally connected to the heat exchange plate (1).
4. An energy-saving device for heating a biogas digester using waste heat from biogas power generation, as described in claim 1, is characterized in that: The air intake duct (11) is connected to the heat exchange plate (1), and the air intake pipe (12) is connected to the flue gas pipe of the biogas power generation equipment.
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 heat exchange tube (2) at the upper end of the ash discharge channel (8) has no fins (3) at its outer end, and the upper end of the heat exchange tube (2) is set as an inclined surface.
6. An energy-saving device for heating a biogas digester using waste heat from biogas power generation, as described in claim 1, is characterized in that: There is a gap between the heat exchange tube (2) and the top plate of the heat exchange plate (1). A cleaning plate (13) is slidably connected inside the heat exchange plate (1). The cleaning plate (13) is slidably connected to the outer end of the heat exchange tube (2) and the fins (3).
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 threaded rod (14) is rotatably connected inside the heat exchange plate (1), and the cleaning plate (13) is threadedly connected to the outer end of the threaded rod (14). A servo motor (15) is connected to the side end of the heat exchange plate (1), and the drive end of the servo motor (15) is connected to the threaded rod (14).