A combined device for producing biogas and generating electricity by using biogas feed
By installing a monitoring and stirring mechanism in the biogas slurry storage tank, combined with a feeding mechanism, real-time monitoring and dynamic adjustment of pH and temperature can be achieved, solving the problem of abnormal pH in the biogas slurry storage tank, improving fermentation stability and gas production efficiency, and making it suitable for small and medium-sized biogas projects.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG NORTH IND TECHNOLOGY CO LTD
- Filing Date
- 2025-07-29
- Publication Date
- 2026-08-04
AI Technical Summary
Existing biogas slurry storage tanks lack real-time pH monitoring and automatic adjustment functions, which may lead to abnormal pH values, acidification, inhibition of methanogenic bacteria activity, a sharp drop in biogas production, system paralysis, increased ammonia nitrogen toxicity, and microbial community imbalance, affecting fermentation efficiency. Manual intervention is required for adjustment, which is time-consuming and labor-intensive.
The system employs a combination of monitoring, stirring, and feeding mechanisms, including a pH monitor, temperature sensor, biogas composition sensor, stirring mechanism, and feeding mechanism, to achieve real-time monitoring and dynamic adjustment of pH, temperature, and biogas composition. Through motor-driven stirring and quantitative addition of microbial agents, it prevents the formation and sedimentation of scum layer, ensuring fermentation stability.
It enables real-time monitoring and dynamic adjustment of pH and temperature, reduces human intervention, improves fermentation stability, enhances vertical and radial mixing, prevents sedimentation, improves gas production efficiency, avoids system failure, and is suitable for small and medium-sized biogas projects.
Smart Images
Figure CN224590921U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of green new energy technology, specifically a combined device for producing biogas and generating electricity using biogas slurry. Background Technology
[0002] Biogas is a mixed gas produced by the fermentation of organic matter under anaerobic conditions by microorganisms. It's the gas found in swamps; people often see bubbles rising from swamps, sewage ditches, or cesspools. These bubbles can be ignited with a match. This is naturally occurring biogas. Because it was first discovered in swamps, it's called biogas. Human and animal excrement, straw, sewage, and other organic matter ferment in a closed biogas digester under anaerobic (oxygen-free) conditions, being decomposed and transformed by a variety of biogas-fermenting microorganisms to produce biogas. Biogas is a mixture of various gases, with properties similar to natural gas. Besides direct combustion for cooking, drying agricultural products, heating, lighting, and gas welding, biogas can also be used as fuel for internal combustion engines and as a raw material for producing methanol, formaldehyde, carbon tetrachloride, and other chemicals. The liquid and sediment discharged after fermentation in a biogas digester contain relatively rich nutrients and can be used as fertilizer and animal feed. A search revealed a Chinese patent with publication number CN201999929U, which discloses a combined device for producing biogas and generating electricity from biogas slurry. While this patent achieves efficient utilization of biogas slurry and offers advantages such as simple operation, low power generation cost, and being both economical and environmentally friendly, the biogas slurry storage tank lacks real-time pH monitoring and automatic adjustment. This can lead to abnormally low pH levels, which can cause acidification, inhibit methanogen activity, drastically reduce biogas production, and even cause system "runaway" and paralysis. Conversely, excessively high pH levels increase ammonia nitrogen toxicity, disrupt the microbial community, and negatively impact fermentation efficiency, requiring manual intervention, which is time-consuming and labor-intensive. Therefore, we provide a combined device for producing biogas and generating electricity from biogas slurry to address these issues. Utility Model Content
[0003] Technical problems to be solved This invention proposes a combined device for producing biogas and generating electricity using biogas slurry. Through the coordination between the monitoring mechanism, the stirring mechanism, and the feeding mechanism, it solves the problems of abnormally low pH values, which can easily lead to acidification and inhibit the activity of methanogens, causing a sharp drop in biogas production and even causing the system to "go bad" and paralyze; and excessively high pH values, which increase ammonia nitrogen toxicity, cause microbial community imbalance, and easily affect fermentation efficiency, requiring manual intervention and adjustment, which is time-consuming and labor-intensive.
[0004] Technical solution
[0005] To achieve the above objectives, this utility model provides the following technical solution: a combined device for producing biogas and generating electricity using biogas slurry, comprising: a storage tank, a monitoring mechanism, a stirring mechanism, and a feeding mechanism; The monitoring system includes a pH monitor, a temperature sensor, and a biogas composition sensor, which are used to monitor the pH value, temperature, and biogas composition inside the storage tank in real time. The stirring mechanism includes a mounting shaft, threaded blades, and a stirring frame. The stirring mechanism is used to stir the biogas liquid and microbial agents inside the storage tank to prevent the formation of a scum layer. The feeding mechanism includes a storage tank and a weighing sensor, and is used to quantitatively add an appropriate amount of microbial agent to the inside of the storage tank.
[0006] Furthermore, a feed inlet is provided through the outer side of the storage tank, and a sealing cap is threaded onto one end of the feed inlet. A support frame is provided at the bottom of the storage tank.
[0007] Furthermore, the storage tank is provided with a combined cover at the top, and the pH monitor, the temperature sensor, and the biogas composition sensor are all installed through the top of the combined cover.
[0008] Furthermore, a No. 1 motor is provided at the top of the center point of the combined cover, and a connecting shaft is provided at the output end of the No. 1 motor. The top end of the mounting shaft and the bottom end of the connecting shaft are detachably connected by bolts.
[0009] Furthermore, a heating coil is wound around the outside of the storage tank, and a protective shell is provided on the outside of the storage tank, with the protective shell located outside the heating coil.
[0010] Furthermore, a mounting bracket is provided at the top of the storage tank, and multiple sets of weighing sensors are installed at the top of the mounting bracket. The pipes inside the mounting bracket are connected to the inner wall of the bottom of the storage tank, and the storage tank is installed at the top of the multiple sets of weighing sensors.
[0011] Furthermore, a discharge pipe is provided through the bottom of the storage tank, and a spiral component is rotatably provided inside the discharge pipe. The spiral component consists of a shaft and spiral blades. A second motor is provided at one end of the discharge pipe, and the shaft of the output end of the second motor is connected to one end of the spiral component. The spiral blades are provided on the outside of the mounting shaft, and the stirring frame is provided at the bottom of the mounting shaft.
[0012] Furthermore, the storage tank is equipped with a support frame inside, and a power generation mechanism is provided at the top of the support frame. The power generation mechanism includes an anode plate and a cathode plate. A wire is provided at the top of the power generation mechanism and is connected to the anode plate and the cathode plate respectively. A distribution box is provided at the other end of the wire.
[0013] Furthermore, a gas guide pipe is provided through the interior of the storage tank, and a gas storage cabinet is provided through the other end of the gas guide pipe.
[0014] (iii) Beneficial effects: Compared with existing technologies, this combined device for producing biogas and generating electricity from biogas slurry has the following advantages: I. This combined device for producing biogas and generating electricity from biogas slurry is equipped with a monitoring mechanism, a stirring mechanism, and a feeding mechanism. The monitoring mechanism monitors the pH value, temperature, and biogas composition inside the storage tank in real time, enabling real-time feedback of pH, temperature, and biogas composition data and dynamically adjusting the amount of microbial agent added. For example, when the pH is low, acidic raw materials are reduced, effectively reducing human intervention and improving fermentation stability. A No. 1 motor drives the mounting shaft to rotate the threaded blades and stirring frame inside the storage tank. The threaded blades can axially propel the slurry, enhancing vertical mixing, while the stirring frame can radially stir, breaking up the scum layer and promoting mass transfer, preventing bottom sedimentation. Multiple sets of weighing sensors at the top of the mounting frame can precisely control the amount of microbial agent added. Through mechatronics design, a highly efficient closed loop of monitoring-control-gas production-power generation is achieved, making it particularly suitable for small and medium-sized biogas projects.
[0015] II. This combined device for producing biogas and generating electricity from biogas slurry is equipped with heating coils and spiral components. The stirring mechanism works in conjunction with the heating coils to ensure uniform heating of the slurry, avoiding localized overheating or underheating. Heating promotes microbial activity, and stirring accelerates the reaction. Compared with static heating, this device can effectively improve gas production efficiency. The shaft at the output end of the No. 2 motor is connected to one end of the spiral component. When the No. 2 motor is running, the spiral component enables controllable slag discharge, preventing blockage of the discharge pipe. Attached Figure Description
[0016] 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.
[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of one side of the overall structure of this utility model; Figure 3 This is a schematic diagram of the heating coil structure of this utility model; Figure 4 This is a schematic cross-sectional view of the storage tank of this utility model; Figure 5 In this utility model Figure 3 A magnified view of the local structure at point A.
[0018] In the diagram: 1. Storage tank; 2. Feed inlet; 3. Support frame; 4. Combined cover; 5. pH monitor; 6. Temperature sensor; 7. Biogas composition sensor; 8. Motor No. 1; 9. Connecting shaft; 10. Mounting shaft; 11. Threaded blade; 12. Mixing rack; 13. Heating coil; 14. Protective shell; 15. Mounting frame; 16. Weighing sensor; 17. Storage hopper; 18. Discharge pipe; 19. Spiral component; 20. Motor No. 2; 21. Support frame; 22. Generator; 23. Wire; 24. Distribution box; 25. Gas duct; 26. Gas storage tank. Detailed Implementation
[0019] 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.
[0020] like Figure 1-5 As shown, this utility model provides a technical solution: a combined device for producing biogas and generating electricity using biogas slurry; Includes: storage tank 1, monitoring mechanism, mixing mechanism, and feeding mechanism; The monitoring mechanism includes a pH monitor 5, a temperature sensor 6, and a biogas composition sensor 7. The monitoring mechanism is used to monitor the pH value, temperature, and biogas composition inside the storage tank 1 in real time. The top of the storage tank 1 is provided with a combination cover 4. The pH monitor 5 is installed through the top of the combination cover 4, the temperature sensor 6 is installed through the top of the combination cover 4, and the biogas composition sensor 7 is installed through the top of the combination cover 4. The stirring mechanism includes a mounting shaft 10, a threaded blade 11, and a stirring frame 12. The stirring mechanism is used to stir the biogas liquid and microbial agent inside the storage tank 1 to prevent the formation of a scum layer. A No. 1 motor 8 is provided at the top of the center point of the combined cover 4. A connecting shaft 9 is provided at the output end of the No. 1 motor 8. The top of the mounting shaft 10 and the bottom of the connecting shaft 9 are detachably connected by bolts. The feeding mechanism includes a storage tank 17 and a weighing sensor 16. The feeding mechanism is used to quantitatively add an appropriate amount of microbial agent to the inside of the storage tank 1. The top of the storage tank 1 is provided with a mounting frame 15. Multiple sets of weighing sensors 16 are set on the top of the mounting frame 15. The pipe inside the mounting frame 15 is connected to the bottom inner wall of the storage tank 17. The storage tank 17 is set on the top of the multiple sets of weighing sensors 16.
[0021] The pH monitor 5 inside the monitoring unit is used to monitor the acidity and alkalinity of the feed liquid in real time, and link the alkali or acid system to maintain the pH at 6.5-7.5. The temperature sensor 6 is used to provide feedback on the control signal of the heating coil 13 to avoid temperature fluctuations affecting the activity of methanogenic bacteria. The biogas component sensor 7 is used to detect the ratio of CH4, CO2 and H2S, optimize the operating parameters of the generator set, realize real-time feedback of pH, temperature and biogas component data, and dynamically adjust the amount of bacterial agent added, such as reducing acidic raw materials when the pH is low, effectively reducing human intervention and improving fermentation stability. The bottom end of the connecting shaft 9 connected to the output end of the No. 1 motor 8 is assembled and connected to the top end of the mounting shaft 10 with bolts, which facilitates the disassembly and assembly of the mounting shaft 10 later. When the No. 1 motor 8 is driven, it can provide power to the connecting shaft 9, so that the mounting shaft 10 drives the threaded blade 11 and the stirring frame 12 to rotate inside the storage tank 1. The threaded blade 11 can axially propel the liquid and enhance vertical mixing, while the stirring frame 12 can radially stir, break up the scum layer and promote mass transfer, and prevent bottom sedimentation.
[0022] The storage bin 17 is used to store microbial agents. The pipe inside the mounting frame 15 is used to connect the storage bin 17 and the storage tank 1. The pipe is equipped with a solenoid valve, which can be opened or closed by external control equipment. The microbial agents inside the storage bin 17 are transported to the storage tank 1 through the pipe. The amount of microbial agents added can be accurately controlled by multiple sets of weighing sensors 16 at the top of the mounting frame 15.
[0023] A feed inlet 2 is provided through the outside of the storage tank 1. A sealing cap is threaded onto one end of the feed inlet 2. A support frame 3 is provided at the bottom of the storage tank 1.
[0024] Storage tank 1 is the core reaction vessel, which carries the biogas liquid anaerobic fermentation process. The feed inlet 2 can be sealed with a plug to prevent gas leakage. Biogas liquid can be injected into storage tank 1 through feed inlet 2. Support frame 3 ensures the stability of the tank.
[0025] A heating coil 13 is wound around the outside of the storage tank 1, and a protective shell 14 is provided on the outside of the storage tank 1. The protective shell 14 is located outside the heating coil 13.
[0026] The heating coil 13 is spirally wound around the outside of the storage tank 1. The power source for the heating coil 13 can be the waste heat from biogas power generation. The heating coil 13 can maintain a constant temperature fermentation environment (such as 35-55℃) inside the storage tank 1. The protective shell 14 can cover and protect the heating coil 13. The stirring mechanism works in conjunction with the heating coil 13 to ensure that the liquid is heated evenly, avoiding local overheating or low temperature. Heating promotes microbial activity, and stirring accelerates the reaction. Compared with static heating, it can effectively improve gas production efficiency.
[0027] A discharge pipe 18 is provided through the bottom of the storage tank 1. A spiral component 19 is rotatably arranged inside the discharge pipe 18. The spiral component 19 consists of a shaft and spiral blades. A second motor 20 is provided at one end of the discharge pipe 18. The shaft of the output end of the second motor 20 is connected to one end of the spiral component 19. The threaded blade 11 is arranged on the outside of the mounting shaft 10. The stirring rack 12 is arranged at the bottom end of the mounting shaft 10.
[0028] The discharge pipe 18 is connected to the bottom of the storage tank 1, and a solenoid valve is installed inside the discharge pipe 18. The shaft of the output end of the second motor 20 is connected to one end of the screw component 19. When the second motor 20 is running, the screw component 19 can achieve controllable slag discharge and avoid blockage of the discharge pipe 18.
[0029] The storage tank 1 has a support frame 21 inside, and a power generation mechanism 22 is provided at the top of the support frame 21. The power generation mechanism 22 includes an anode plate and a cathode plate. A wire 23 is provided at the top of the power generation mechanism 22. The wire 23 is connected to the anode plate and the cathode plate respectively. A distribution box 24 is provided at the other end of the wire 23. A gas guide pipe 25 is provided through the inside of the storage tank 1. A gas storage tank 26 is provided through the other end of the gas guide pipe 25.
[0030] The power generation unit 22, a microbial fuel cell (MFC) or a traditional gas generator, converts chemical energy into electrical energy. After the power generation unit 22 is connected, the generated electricity is transmitted to the distribution box 24 via the wire 23. After passing through the voltage conversion circuit in the distribution box 24, it can directly provide electrical energy to users. The gas discharged through the gas pipe 25 passes through the gas storage tank 26, where the purified biogas is collected to balance supply and demand fluctuations, and users can use it directly.
[0031] 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.
[0032] 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. A combined device for producing biogas and generating electricity using biogas slurry, characterized in that, include: Storage tank (1), monitoring mechanism, stirring mechanism and feeding mechanism; The monitoring mechanism includes a pH monitor (5), a temperature sensor (6) and a biogas composition sensor (7), which is used to monitor the pH value, temperature and biogas composition inside the storage tank (1) in real time. The stirring mechanism includes a mounting shaft (10), a threaded blade (11), and a stirring frame (12). The stirring mechanism is used to stir the biogas liquid and microbial agent inside the storage tank (1) to prevent the formation of a scum layer. The feeding mechanism includes a storage tank (17) and a weighing sensor (16), which is used to quantitatively add an appropriate amount of microbial agent to the inside of the storage tank (1).
2. The combined device for producing biogas and generating electricity using biogas slurry according to claim 1, characterized in that: The storage tank (1) has a feed inlet (2) through it. One end of the feed inlet (2) is threaded with a sealing cap. The bottom of the storage tank (1) is provided with a support frame (3).
3. The combined device for producing biogas and generating electricity using biogas slurry according to claim 1, characterized in that: The storage tank (1) is provided with a combined cover (4) at the top. The pH monitor (5) is installed through the top of the combined cover (4). The temperature sensor (6) is installed through the top of the combined cover (4). The biogas composition sensor (7) is installed through the top of the combined cover (4).
4. The combined device for producing biogas and generating electricity using biogas slurry according to claim 3, characterized in that: A No. 1 motor (8) is provided at the top of the center point of the combined cover (4), and a connecting shaft (9) is provided at the output end of the No. 1 motor (8). The top end of the mounting shaft (10) and the bottom end of the connecting shaft (9) are detachably connected by bolts.
5. The combined device for producing biogas and generating electricity using biogas slurry according to claim 1, characterized in that: A heating coil (13) is wound around the outside of the storage tank (1), and a protective shell (14) is provided on the outside of the storage tank (1), with the protective shell (14) located outside the heating coil (13).
6. The combined device for producing biogas and generating electricity using biogas slurry according to claim 1, characterized in that: The storage tank (1) is provided with a mounting frame (15) at the top, and multiple sets of weighing sensors (16) are provided at the top of the mounting frame (15). The pipe inside the mounting frame (15) is connected to the bottom inner wall of the storage bucket (17), and the storage bucket (17) is provided at the top of the multiple sets of weighing sensors (16).
7. The combined device for producing biogas and generating electricity using biogas slurry according to claim 1, characterized in that: The storage tank (1) has a discharge pipe (18) running through its bottom end. The discharge pipe (18) has a rotating spiral component (19) inside it. The spiral component (19) consists of a shaft and spiral blades. A second motor (20) is installed at one end of the discharge pipe (18). The shaft of the output end of the second motor (20) is connected to one end of the spiral component (19). The spiral blade (11) is located on the outside of the mounting shaft (10). The stirring rack (12) is located at the bottom end of the mounting shaft (10).
8. The combined device for producing biogas and generating electricity using biogas slurry according to claim 1, characterized in that: The storage tank (1) is provided with a support frame (21) inside. A power generation mechanism (22) is provided at the top of the support frame (21). The power generation mechanism (22) includes an anode plate and a cathode plate. A wire (23) is provided at the top of the power generation mechanism (22). The wire (23) is connected to the anode plate and the cathode plate respectively. A distribution box (24) is provided at the other end of the wire (23).
9. A combined device for producing biogas and generating electricity using biogas slurry according to claim 1, characterized in that: The storage tank (1) is provided with a gas guide pipe (25) running through its interior, and a gas storage cabinet (26) is provided at the other end of the gas guide pipe (25).