A biogas fermentation device based on LSTM model

Abstract

A biogas fermentation device based on an LSTM model comprises a tank assembly (1), a top plate assembly (2), a stirring assembly (3) and a server (6), wherein the tank assembly (1) is designed as a circular tank structure, the top plate assembly (2) is slidably arranged on the top of the tank assembly (1), the stirring assembly (3) is arranged below the top plate assembly (2) and is used to stir the material in the tank assembly (1), the top plate assembly (2) is provided with a transmission motor (2-4), a pressure sensor (2-13) and a pH sensor (2-14), the tank assembly (1) is provided with a heating strip (1-3) for heating the material, and a biogas collection and transmission pipe (4) is also provided above the tank assembly (1) for conveying the collected and generated biogas. The beneficial effect is that the biogas fermentation device can be kept in an optimal working state for a long time.

Description

Technical Field

[0001] The invention relates to the fields of biogas fermentation and deep learning, and in particular to a biogas fermentation device based on an LSTM model. Background Art

[0002] Anaerobic digestion units are commonly used to convert organic waste into biogas, which is an environmentally friendly way of producing energy, helping to reduce waste and generate renewable energy.

[0003] During the use of the anaerobic fermentation device of biogas, the commonly used feeding method of the anaerobic fermentation device of biogas is usually to perform feeding operations by means of pipelines, etc. Such a feeding method is inefficient and cannot ferment some larger organic matter. However, if the input feeding method is adopted, organic matter will remain at the feeding edge of the anaerobic fermentation device of biogas, which may easily lead to a decrease in the sealing of the anaerobic fermentation device of biogas, and affect the fermentation quality of the anaerobic fermentation device of biogas.

[0004] Biogas is produced by the decomposition of organic matter by various microorganisms (collectively known as biogas bacteria) under conditions of isolation from air and maintaining a certain moisture, temperature, pH, etc. The process of biogas bacteria decomposing organic matter to produce biogas is called biogas fermentation. This is the basic principle of biogas production, namely the anaerobic mechanism. To produce biogas normally, good conditions must be created for microorganisms so that they can survive and reproduce in a good environment. The biogas tank must meet a variety of conditions, which is the pretreatment process.

[0005] The publication number is CN117903913A, which discloses an environmentally friendly agricultural waste treatment system and method. The treatment system includes a pretreatment module, an anaerobic fermentation module, a biogas utilization module, a biogas residue utilization module and a monitoring and control module. The pretreatment module is used to pretreat agricultural waste; the anaerobic fermentation module is used to perform anaerobic fermentation on pretreated organic waste; the biogas utilization module is used to collect, purify, store and comprehensively utilize the biogas produced by anaerobic fermentation; the biogas residue utilization module is used to further process and utilize the biogas residue produced by anaerobic fermentation; the monitoring and control module is used to collect and analyze the data of each module, and send control instructions to each module according to the preset intelligent control model and algorithm to realize process monitoring and optimization control. This application realizes the efficient treatment and resource utilization of agricultural waste, which not only reduces the pollution of agricultural waste to the environment, but also can transform waste into resources.

[0006] Based on the above understanding, how to put the system in the best state during the biogas generation process and obtain biogas continuously and efficiently is one of the key issues that everyone is studying. How to efficiently ferment during raw material pretreatment is one of the difficulties of this problem. Moreover, if the internal air pressure of the biogas raw material pretreatment device is too high, there is a threat of explosion, which is dangerous. Summary of the invention

[0007] The purpose of this application is to provide a biogas fermentation device based on an LSTM model to solve the problems of poor efficiency in the existing pretreatment of biogas raw materials, the threat of explosion if the internal air pressure of the biogas raw material pretreatment device is too high, and the fermentation device cannot maintain the optimal aeration state for a long time. In addition, when dumping materials, it is easy to spill around the tank body, causing the sealed tank body to be loosely sealed, affecting the fermentation.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A biogas fermentation device based on an LSTM model comprises a tank assembly (1), a top plate assembly (2), a stirring assembly (3) and a server (6), wherein the tank assembly (1) is designed as a circular tank structure, the top plate assembly (2) is slidably arranged on the top of the tank assembly (1), the stirring assembly (3) is arranged below the top plate assembly (2) and is used to stir the material in the tank assembly (1), the top plate assembly (2) is provided with a transmission motor (2-4), a pressure sensor (2-13) and a pH sensor (2-14), a heating strip (1-3) for heating the material is arranged in the tank assembly (1), and a biogas collection and transmission pipe (4) is also arranged above the tank assembly (1) and is used to transport the collected and generated biogas, characterized in that:

[0010] The stirring assembly (3) mainly comprises a stirring shaft (3-3) and a connecting head (3-4); the stirring shaft (3-3) is installed in the connecting head (3-4) through a transmission seat (3-1); a transmission head (3-2) is provided at the upper end of the stirring shaft (3-3) for being matched and connected with a transmission motor (2-4); the stirring shaft (3-3) is divided into an upper stirring shaft (3-3-1) and a lower stirring shaft (3-3-2); the lower stirring shaft (3-3-2) is located below the upper stirring shaft (3-3-1); an upper limit frame (3-3-5) and a lower limit frame (3-3-7) are provided at the connection between the upper stirring shaft (3-3-1) and the lower stirring shaft (3-3-2) A fixed limit rod (3-3-6) for fixing the lower limit frame (3-3-7) is provided on one side of the lower limit frame (3-3-7), and a bevel gear (3-3-8) is provided on the end faces of the upper stirring shaft (3-3-1) and the lower stirring shaft (3-3-2), and the two bevel gears (3-3-8) are movably connected via a transmission gear (3-3-9) fixed on the upper limit frame (3-3-5); when the upper stirring shaft (3-3-1) rotates under the drive of the transmission motor (2-4), the lower stirring shaft (3-3-2) rotates in the opposite direction to the upper stirring shaft (3-3-1) due to the transmission of the transmission gear (3-3-9);

[0011] The server (6) is provided with a fermentation control model for processing data collected by the biogas fermentation device, calculating the power value for controlling the transmission motor (2-4) and the stirring component (3), and sending corresponding control signals to the transmission motor (2-4) and the stirring component (3) through the network switch (5), so as to put the biogas fermentation device in an optimal production state.

[0012] Furthermore, the training generation process of the fermentation control model includes the following steps:

[0013] Step S101, collecting data: collecting real-time data of the temperature sensor (1-20), the pressure sensor (2-13), the pH sensor (2-14), as well as the external temperature value, the real-time power value of the transmission motor (2-4), the stirring component (3) and the time when the material is put into the tank body (1-19);

[0014] Step S102, data preprocessing: cleaning the collected data, filling missing values ​​with the average value, and normalizing the data using the maximum and minimum method;

[0015] Step S103, constructing an LSTM model: inputting the preprocessed data into the LSTM model in time sequence, the model hyperparameters include the number of input features being 6, the hidden layer dimension being 64, the number of LSTM layers being 3, the number of output features being 2, the learning rate being 0.001, the loss function being the mean square error loss function, and the optimizer being Adam;

[0016] Step S104, training to generate a fermentation control model: the LSTM model of step S103 is trained for 1000 iterations or the training is terminated when the loss error value tends to be stable, and the final trained model is saved as the fermentation control model.

[0017] Furthermore, the tank body assembly (1) comprises a tank body (1-19), and eight trigger assemblies (1-16) are provided at the upper opening of the tank body (1-19). When the trigger assemblies (1-16) are connected end to end, the circle formed by them matches the opening of the tank body (1-19). The top plate assembly (2) is provided with a pressing assembly (2-12) that matches the trigger assemblies (1-16). By using the trigger assemblies (1-16) and the pressing assembly (2-12) in coordination, it is possible to prevent materials from being spilled at the upper opening of the tank body (1-19) when pouring materials into the tank body (1-19).

[0018] Furthermore, the top plate assembly (2) includes a top plate body (2-11) and a connecting assembly (2-10). The top plate body (2-11) is provided with a connecting assembly (2-10) for covering or opening the tank body (1-19). The connecting assembly (2-10) mainly includes two connecting joints (2-2) which are fixedly installed in cooperation with the cylinder A (1-4). A transmission bracket (2-1) is provided between the two connecting joints (2-2). A bracket mounting bracket (2-3) is provided inside the transmission bracket (2-1). A transmission motor (2-4) is installed inside the bracket for being connected in cooperation with the stirring assembly (3). The pressing assembly (2-12) is evenly distributed on the top plate body (2-11).

[0019] Furthermore, a support base (1-1) is fixed to the upper half of the tank body (1-19), and the support base (1-1) is fixedly connected to the tank body (1-19) via support columns (1-2) around the tank body (1-19). A discharge pipe (1-5) for discharging internal raw materials is provided below the front end of the tank body (1-19), and a biogas pipe (1-15) is provided above the front end of the tank body (1-19). The biogas pipe (1-15) is connected to the transmission pipe (4). A cylinder A (1-4) is provided at a symmetrical position above the support base (1-1) for installing a top plate assembly (2). Six heating strips (1-3) are evenly distributed inside the tank body (1-19) and are installed in a circular array to maintain uniform heating of the material. A temperature sensor (1-20) is provided inside the tank body (1-19) to upload the working temperature of the tank body (1-19) to the server (6) in real time.

[0020] Furthermore, the transmission pipe (4) is provided with a sealing plug (4-4), a ventilation frame (4-3), a spring (4-2) and a positioning ring (4-1) in sequence from front to back, and a fan (4-5) is provided at the rear end of the positioning ring (4-1). The front end of the interior of the transmission pipe (4) is of a conical design, and the shape of the sealing plug (4-4) is adapted to the shape of the front end of the transmission pipe (4); the positioning ring (4-1) functions to provide a fixed point for the ventilation frame (4-3) to ensure that the ventilation frame (4-3) maintains a correct position in the transmission pipe (4); the positioning ring (4-1) can stabilize the ventilation frame (4-3) so that it does not move in the transmission pipe (4), thereby ensuring that the sealing plug (4-4) can correctly fit the conical rear end of the transmission pipe (4).

[0021] Furthermore, the protective shell (1-6) is designed as an L-shaped shell structure, and a reinforcement block is added at the connection with the tank body component (1) to improve the structural stability. The protective slider (1-7) is a rectangular block structure and can slide inside the protective shell (1-6). The protective block (1-8) adopts an arc block structure design and is integrally arranged on the outside of the protective slider (1-7). Its arc shape matches the tank body (1-19). A sliding connection sliding component (1-17) is provided above the transmission slot (1-9). The transmission slot (1-9) is used to limit the sliding range of the sliding component (1-17). When the sliding component (1-17) slides into the transmission slot (1-9), the protective block (1-8) slides outward along the edge of the tank body (1-19).

[0022] Furthermore, the sliding assembly (1-17) comprises a touch slider (1-10) and a transmission plug-in block (1-11), and transmission joints A (1-13) are respectively provided on both sides of the touch slider (1-10), and springs for resetting the sliding assembly (1-17) are provided thereunder, and the size of the transmission slot (1-9) matches that of the transmission plug-in block (1-11) to ensure that the two can work together smoothly.

[0023] Furthermore, the protection component (1-18) comprises a protection block (1-8), a protection slider (1-7) is integrally connected to the outer side of the protection block (1-8), a transmission slot (1-9) is provided at the top of the protection slider (1-7), the size of the transmission slot (1-9) is adapted to the sliding component (1-17), a transmission joint B (1-14) is connected to the bottom end of the protection slider (1-7), and a spring for elastically restoring the protection component (1-18) is provided at the bottom of the transmission joint B (1-14) and the trigger component (1-16).

[0024] Furthermore, the top plate assembly (2) further comprises a transmission bracket (2-1), which is symmetrically mounted on the top of the top plate assembly (2); one end of the connecting joint (2-2) is designed in an arc-shaped structure and is symmetrically fixedly mounted on one side of the transmission bracket (2-1); the connecting joint (2-2) is fixedly connected to the piston rod of the cylinder A (1-4); the mounting bracket (2-3) is mounted between the top of the biogas fermentation device, the transmission motor (2-4) is mounted in the middle of the mounting bracket (2-3), a hexagonal transmission groove is provided at the bottom of the rotating shaft of the transmission motor (2-4), a hexagonal groove is provided at the top of the transmission motor (2-4), and the hexagonal groove of the transmission motor (2-4) is plugged into the transmission head (3-2). When the top plate assembly (2) descends, the hexagonal groove on the transmission motor (2-4) is plugged into the transmission head (3-2).

[0025] Its beneficial effects are:

[0026] 1. By adopting the fermentation control model, the biogas fermentation device is kept in the best working state for a long time, and the efficiency of biogas production in the biogas fermentation device is improved by improving the efficiency of material pretreatment in the biogas fermentation device;

[0027] 2. The downward pressure component (2-12) and the trigger component (1-16) are used in combination to reduce the sealing gap caused by the material. When the material is poured into the fermentation tank, part of the material will fall onto the protective block (1-8). When the fermentation top plate moves downward to seal the fermentation tank, the trigger block (2-8) on the outside of the fermentation top plate will first touch the trigger slider (1-10), and the protective block (1-8) will be separated from the top of the fermentation tank, thereby removing the obstruction to the top of the fermentation tank. The material remaining on the protective block (1-8) will be separated from the connection between the fermentation tank and the fermentation top plate, so that the remaining material will not be in the connection between the fermentation tank and the fermentation top plate, thereby strengthening the connection sealing between the fermentation tank and the fermentation top plate, and improving the fermentation quality;

[0028] 2. The arrangement of the top plate assembly (2) can further improve the fermentation quality. The stirring shaft (3-3) at the bottom of the transmission seat rotates together, and the spiral blades (3-3-4) on the stirring shaft (3-3) stir the fermented material, so that the material can be fermented more evenly. Through the cooperation between the cylinder B (2-9) and the stirring shaft (3-3), the stirring shaft (3-3) and the transmission motor (2-4) can be freely matched, which is convenient for the installation and use of the stirring shaft (3-3);

[0029] 3. By using the coordination of the helical gear (3-3-8) and the transmission gear (3-3-9), the spiral blades (3-3-4) on the upper stirring shaft (3-3-1) and the lower stirring shaft (3-3-2) can be rotated in opposite directions, so that the materials in the tank body (1-19) can be stirred evenly, which is conducive to the full mixing of the materials and makes it easier to release the biogas in the materials;

[0030] 4. The front end of the biogas pipe (1-15) is docked with the transmission pipe (4). After the fan (4-5) is started, the fan (4-5) generates wind force in the forward direction, thereby generating an adsorption effect. The adsorption force drives the sealing plug (4-4) to break away from the fitting with the conical position of the gas transmission pipe, and the biogas inside the treatment tank (1-19) is transferred from the transmission pipe (4) to the collection container, thereby avoiding excessive pressure inside the treatment tank;

[0031] 5. When the internal pressure of the treatment tank body (1-19) is too high, the air pressure inside the treatment tank body (1-19) will push the sealing plug (4-4) to slide, and the spring (4-2) will shrink simultaneously. The biogas inside the treatment tank body (1-19) will be transferred from the internal gap between the biogas pipe (1-15) and the transmission pipe (4) to the collection container, which can effectively release the pressure inside the tank body (1-19). BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural diagram of a biogas fermentation device based on the LSTM model;

[0033] Figure 2 is a schematic structural diagram of a tank assembly (1);

[0034] Figure 3 is a schematic diagram of the disassembled structure of the trigger assembly (1-16);

[0035] Figure 4 is a schematic diagram of the structure of a sliding assembly (1-17);

[0036] Figure 5 is a schematic diagram of the structure of the protection component (1-18);

[0037] Figure 6 is a schematic structural diagram of a top plate assembly (2);

[0038] Figure 7 It is a schematic diagram of the connection joint structure of a biogas fermentation device based on the LSTM model;

[0039] Figure 8 is a schematic structural diagram of a pressing component (2-12);

[0040] Fig. 9 It is a schematic diagram of the structure of a stirring component (3) of a biogas fermentation device based on an LSTM model;

[0041] Fig.10 yes Figure 6 The enlarged view of point A in the middle;

[0042] Fig.11 is a cross-sectional view of the transmission pipe (4);

[0043] Fig.12 yes Fig. 9 Stereoscopic image of

[0044] Fig.13 It is a circuit structure diagram of a biogas fermentation device;

[0045] Fig.14 It is a flow chart of fermentation control model training generation.

[0046] 1: Tank assembly, 2: Top plate assembly, 3: Stirring assembly, 4: Transmission pipe, 5: Network switch, 6: Server, 1-1: Support seat, 1-2: Support column, 1-3: Heating strip, 1-4: Cylinder A, 1-5: Discharge pipe, 1-6: Protective shell, 1-7: Protective slider, 1-8: Protective block, 1-9: Transmission slot, 1-10: Touch slider, 1-11: Transmission plug-in block, 1-12: Protective baffle, 1-13: Transmission joint A, 1-14: Transmission joint B, 1-15: Biogas pipe, 1-16: Touch assembly, 1-17: Sliding assembly, 1-18: Protective assembly, 1-19: Tank, 1-20: Temperature sensor, 2-1: Transmission bracket, 2-2: Connecting joint, 2-3: Mounting bracket, 2-4: Transmission motor, 2-5: Transmission side seat, 2-6: Limit support, 2-7: Transmission slide, 2-8: Touch block, 2-9: Cylinder B, 2-10: Connecting assembly, 2-11: Top plate body, 2-12: Down pressure assembly, 2-13: Pressure sensor, 2-14: PH sensor, 3-1: Transmission seat, 3-2: Transmission head, 3-3: Stirring shaft, 3-3-1: Upper stirring shaft, 3-3-2: Lower stirring shaft, 3-3-3: Fixed rod, 3-3-4: Spiral blade, 3-3-5: Upper limit frame, 3-3-6: Fixed limit rod, 3-3-7: Lower limit frame, 3-3-8: Bevel gear, 3-3-9: Transmission gear, 3-4: Connecting head, 4-1: Positioning ring, 4-2: Spring, 4-3: Ventilation frame, 4-4: Sealing plug, 4-5: Fan. DETAILED DESCRIPTION

[0047] The following embodiments, in conjunction with the relevant drawings, further illustrate the specific implementation methods provided by the present invention in detail. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work are within the scope of protection of the present invention.

[0048] like Figure 1 and 13 As shown, a biogas fermentation device based on an LSTM model comprises: a tank assembly (1), a top plate assembly (2), a stirring assembly (3) and a server (6), wherein the tank assembly (1) is in the shape of a circular tank structure; a slidable circular top plate assembly (2) is designed on the top. A stirring assembly (3) is arranged below the top plate assembly (2) for stirring the material in the tank assembly (1). A biogas collection and transmission pipe (4) is also arranged above the tank assembly (1) for transmitting the collected and generated biogas.

[0049] A fermentation control model is provided in the server (6). After the data collected by the biogas fermentation device is processed by the fermentation control model, the server (6) calculates the power values ​​of the control drive motor (2-4) and the stirring component (3), and sends corresponding control signals to the drive motor (2-4) and the stirring component (3) through the network switch (5). The optimal stirring power and heater power are obtained by using the fermentation control model.

[0050] The training and generation process of the fermentation control model is as follows: Fig.14 As shown:

[0051] Step S101, collecting data: collecting real-time data of the temperature sensor (1-20), the pressure sensor (2-13), and the pH sensor (2-14) in the biogas fermentation device, as well as the external temperature, the real-time power value of the transmission motor (2-4) and the stirring component (3), and the time when the material is put into the tank (1-19);

[0052] Step S102, data preprocessing: clean the data collected in step S101, fill the missing values ​​involved therein with the average value, and use the maximum and minimum value method for data normalization;

[0053] Step S103, constructing an LSTM model, inputting the data processed in step S102 into the LSTM model in time sequence, wherein the hyperparameters of the LSTM model are as follows:

[0054] The number of input features is 6, and the data items input to the model are the temperature sensor (1-20), pressure sensor (2-13), pH sensor (2-14), external temperature, transmission motor (2-4) and stirring component (3) in the biogas fermentation device;

[0055] The dimension of the hidden layer is 64;

[0056] The number of LSTM layers is 3;

[0057] The number of output features is 2 because the model is used to predict the power values ​​that the drive motor (2-4) and the stirring component (3) should use;

[0058] The learning rate is 0.001;

[0059] The loss function used by the model is the mean square error loss function, and the optimizer is Adam.

[0060] Step S104, training to generate a fermentation control model, the LSTM model of step S103 is trained for 1000 iterations or the training is terminated when the loss error value tends to be stable, and the final trained model is saved as the fermentation control model.

[0061] The LSTM model is able to process time series data, which is very important in the biogas fermentation process because fermentation is a time-varying process. The LSTM model can predict future fermentation conditions such as temperature, pH value, and pressure based on historical data.

[0062] At the same time, it can also optimize operating parameters and predict the optimal power values ​​of the drive motor and stirring components through the fermentation control model. The LSTM model helps to optimize the fermentation process and ensure that the materials are fully stirred while maintaining a suitable fermentation environment.

[0063] Finally, the degree of automated control is also improved. The output of the fermentation control model can be directly used in the automated control system to send control signals to related components through the network switch, reducing manual intervention and improving the accuracy and efficiency of operations.

[0064] The fermentation efficiency can be improved by adopting the fermentation control model. By accurately controlling the fermentation conditions, the fermentation control model helps to improve the biogas production and quality, making the fermentation process more efficient. It can also save energy and reduce consumption. The model can predict and adjust power consumption to avoid excessive use of energy, thereby reducing operating costs and enhancing system stability. The LSTM model helps to improve product quality and ensure the stable operation of the system by accurately controlling these parameters. In summary, the application of the fermentation control model generated by the LSTM model in the biogas fermentation device significantly improves the automation level and efficiency of the fermentation process, and also provides strong help for energy management and process optimization.

[0065] like Figure 2 As shown, the tank assembly (1) is composed of a plurality of components including a tank (1-19). A support seat (1-1) is fixed to the upper half of the tank (1-19), and the support seat (1-1) is fixedly connected to the tank (1-19) around the support column (1-2). The lower front end of the tank (1-19) is connected to the outside world through a discharge pipe (1-5) to facilitate the discharge of internal raw materials. The biogas pipe (1-15) is connected to the transmission pipe (4). A cylinder A (1-4) is provided at a symmetrical position above the support seat (1-1) for installing the top plate assembly (2). Six heating strips (1-3) are evenly distributed inside the tank (1-19) and are installed in a circular array to maintain uniform heating of the material, ensure uniform temperature distribution, and improve fermentation efficiency. A temperature sensor (1-20) is provided inside the tank (1-19) to upload the working temperature of the tank (1-19) to the server (6) in real time. Eight trigger assemblies (1-16) are arranged at the upper opening of the tank body (1-19); when the trigger assemblies (1-16) are connected end to end, the circle formed by them matches the opening of the tank body (1-19).

[0066] like Figure 3As shown, the protective shell (1-6) is designed as an L-shaped shell structure, and a reinforcing block is added at the connection with the tank body component (1) to improve the structural stability. The protective slider (1-7) is a rectangular block structure and can slide inside the protective shell (1-6). The protective block (1-8) adopts an arc block structure design and is integrally arranged on the outside of the protective slider (1-7), and its arc shape matches the tank body (1-19). A sliding connection sliding component (1-17) is provided above the transmission slot (1-9), and the transmission slot (1-9) is used to limit the sliding range of the sliding component (1-17). When the sliding component (1-17) slides into the transmission slot (1-9), the protective block (1-8) slides outward along the edge of the tank body (1-19).

[0067] like Figure 3 and 4 As shown, the sliding assembly (1-17) includes a touch slider (1-10) and a transmission plug-in block (1-11), and a transmission joint A (1-13) is provided on both sides of the touch slider (1-10), and a spring for resetting the sliding assembly (1-17) is provided thereunder. The size of the transmission slot (1-9) matches the transmission plug-in block (1-11) to ensure that the two can work together smoothly. Through the cooperation between the above components, the top plate assembly (2) can be accurately slid and positioned, so that the top plate assembly is kept stable during operation, and the safety risks caused by improper operation are reduced.

[0068] like Figure 3 and 5 As shown, the protection component (1-18) includes a protection block (1-8), a protection slider (1-7) is integrally connected to the outer side of the protection block (1-8), a transmission slot (1-9) is provided at the top of the protection slider (1-7), and the size of the transmission slot (1-9) is adapted to the sliding component (1-17); a transmission joint B (1-14) is connected to the bottom end of the protection slider (1-7), and a spring for elastically restoring the protection component (1-18) is provided at the bottom of the transmission joint B (1-14) and the trigger component (1-16).

[0069] like Figure 6 As shown, the top plate assembly (2) includes a top plate body (2-11) and a connection assembly (2-10), and the top plate body (2-11) is provided with the connection assembly (2-10) for covering or opening the tank body (1-19). Figure 7 As shown, the connection assembly (2-10) mainly includes two connection joints (2-2) which are fixedly installed in cooperation with the cylinder A (1-4). A transmission bracket (2-1) is provided between the two connection joints (2-2), a bracket mounting bracket (2-3) is provided inside the transmission bracket (2-1), and a transmission motor (2-4) is installed inside the bracket for connecting with the stirring assembly (3) to provide power for the stirring assembly (3).

[0070] A pressing component (2-12) matching with the trigger component (1-16) is provided on the upper part of the top plate body (2-11). Figure 8 As shown, a transmission side seat (2-5) is provided on the top of the pressing assembly (2-12), a limiting pillar (2-6) is provided below the transmission side seat (2-5), a transmission slide (2-7) is provided on the limiting pillar (2-6), the transmission slide (2-7) is designed as an elliptical seat structure, and the transmission slide (2-7) is slidably arranged outside the limiting pillar (2-6), a trigger block (2-8) is provided on the outside of the transmission slide (2-7), and a spring is provided between the transmission slide (2-7) and the transmission side seat (2-5). Two cylinders B (2-9) are provided on the top plate body (2-11) for installing and adjusting the stirring assembly (3). A pressing assembly (2-12) and a pressure sensor (2-13) are provided near the edge of the top plate body (2-11), and the pressing assembly (2-12) and the pressure sensor (2-13) upload the collected data to the server (6) through the network switch (5).

[0071] like Fig. 9 As shown, the stirring assembly (3) mainly includes a stirring shaft (3-3) and a connecting head (3-4). The stirring shaft (3-3) is installed in the connecting head (3-4) through a transmission seat (3-1). A transmission head (3-2) is provided at the upper end of the stirring shaft (3-3) for connecting with a transmission motor (2-4). Figure 6 and 10 As shown, the stirring shaft (3-3) is divided into an upper stirring shaft (3-3-1) and a lower stirring shaft (3-3-2), the lower stirring shaft (3-3-2) is located below the upper stirring shaft (3-3-1), and the upper stirring shaft (3-3-1) and the lower stirring shaft (3-3-2) are connected at a connection point through an upper limit frame (3-3-5) and a lower limit frame (3-3-7), a fixed limit rod (3-3-6) for fixing the lower limit frame (3-3-7) is provided on one side of the lower limit frame (3-3-7), and bevel gears (3-3-8) are provided on the end surfaces of the upper stirring shaft (3-3-1) and the lower stirring shaft (3-3-2), and the two bevel gears (3-3-8) are movably connected through a transmission gear (3-3-9) fixed on the upper limit frame (3-3-5). In this way, when the upper stirring shaft (3-3-1) rotates driven by the transmission motor (2-4), the lower stirring shaft (3-3-2) rotates in the opposite direction to the upper stirring shaft (3-3-1) due to the transmission of the transmission gear (3-3-9), thereby stirring the materials more effectively, avoiding dead corners, and improving the fermentation efficiency.

[0072] A spiral blade (3-3-4) is provided on the lower stirring shaft (3-3-2) and the upper stirring shaft (3-3-1), and the spiral blade (3-3-4) is fixed to the lower stirring shaft (3-3-2) via a fixing rod (3-3-3).

[0073] like Figure 1 , 11 As shown in 12, a transmission pipe (4) is connected to the outside of the biogas pipe (1-15), and a sealing plug (4-4), a ventilation frame (4-3), a spring (4-2) and a positioning ring (4-1) are arranged in sequence from front to back in the transmission pipe (4), and a fan (4-5) is arranged at the rear end of the positioning ring (4-1). The front end of the interior of the transmission pipe (4) is conical in design, and the shape of the sealing plug (4-4) is adapted to the shape of the front end of the transmission pipe (4). The positioning ring (4-1) serves to provide a fixed point for the ventilation frame (4-3) to ensure that the ventilation frame (4-3) maintains the correct position in the transmission pipe (4). The positioning ring (4-1) can stabilize the ventilation frame (4-3) so that it does not move in the transmission pipe (4), thereby ensuring that the sealing plug (4-4) can correctly fit the conical rear end of the transmission pipe (4). The spring (4-2) is used to provide an elastic force for pushing or pulling the ventilation frame (4-3) and the sealing plug (4-4). When the ventilation path needs to be opened or closed, the spring (4-2) can move the ventilation frame (4-3) and the sealing plug (4-4) along the transmission pipe (4) to control the flow of biogas. The elastic restoring force of the spring (4-2) can realize automatic return to the initial position when no external force is applied.

[0074] The function of the fan (4-5) is to generate an airflow for driving the biogas through the transmission pipe (4). When the fan (4-5) is started, it generates a pressure difference at the front end of the transmission pipe (4), and this pressure difference can help push the biogas from the inside of the tank body (1-19) to the external collection container. At the same time, the airflow generated by the fan (4-5) can help open the sealing plug (4-4), allowing the biogas to flow through the gap of the ventilation rack (4-3), thereby regulating the pressure in the tank body. The function of the ventilation rack (4-3) is to serve as a channel for the flow of biogas. It is fixed inside the transmission pipe (4), usually located at the front end of the sealing plug (4-4), forming a path for the biogas from the tank body (1-19) to the external collection container. The design of the ventilation rack (4-3) allows the biogas to pass through without affecting the sealing of the tank body.

[0075] The function of the sealing plug (4-4) is to control the flow of biogas and maintain the sealed state of the tank (1-19). It is usually fitted with the conical rear end of the transmission pipe (4) to prevent the unauthorized escape of biogas. When the biogas needs to be released, the sealing plug (4-4) can be moved to open the passage to the ventilation rack (4-3).

[0076] The working process of each component of the sealing plug (4-4) is as follows:

[0077] When the fan (4-5) is started, it generates an airflow at the front end of the transmission pipe (4), which creates a pressure difference inside the transmission pipe (4). This pressure difference causes the sealing plug (4-4) to move away from the tapered rear end position of the transmission pipe (4), allowing biogas to flow through the ventilation frame (4-3). The spring (4-2) connects the positioning ring (4-1) and the ventilation frame (4-3) to provide the necessary elastic force for the sealing plug (4-4). At this time, the elastic force enables the sealing plug (4-4) to automatically return to the initial position when the fan (4-5) is turned off, re-sealing the transmission pipe (4) to prevent biogas from escaping. When the biogas needs to be collected, the operation of the fan (4-5) and the movement of the sealing plug (4-4) work together to ensure that the biogas can be safely transferred from the tank (1-19) to the collection container, while maintaining the sealing of the system and the collection efficiency of the biogas.

[0078] The ventilation frame (4-3), the sealing plug (4-4), the spring (4-2) and the fan (4-5) together constitute a sophisticated biogas control device, which cooperate with each other to ensure that the biogas fermentation device can effectively collect biogas while maintaining the sealing of the tank and the balance of the internal pressure.

[0079] like Fig.13 As shown, the pressure sensor (2-13), the pH sensor (2-14) and the temperature sensor (1-20) upload the real-time collected data to the server (6) through the network switch (5). The server (6) processes the collected data through the fermentation control model set therein to obtain the optimal working power value of the heating strip (1-3) and the transmission motor (2-4). The server (6) sends the optimal working power to the transmission motor (2-4) and the heating strip (1-3) through the network switch (5), so that the biogas fermentation device is always in the best working state.

[0080] When the biogas fermentation device is needed, the stirring shaft (3-3) is installed in the tank assembly (1), and the transmission head (3-2) at the upper end of the stirring shaft (3-3) passes through the top plate body (2-11), and then is connected to the top plate assembly (2) through the transmission seat (3-1) and the connector (3-4). After the biogas raw material is poured into the tank (1-19), the transmission motor (2-4) is started to drive the transmission head (3-2) to rotate, and the spiral blade (3-3-4) rotates along with the rotation direction of the stirring shaft (3-3). At the same time, the helical gear (3-3-8) and the transmission gear (3-3-9) are meshed and rotated, and the two spiral blades (3-3-4) rotate in opposite directions, which makes it easier for the biogas raw material inside the tank (1-19) to turn over, and avoids the uneven distribution of the fermentation position inside the tank (1-19).

[0081] The front end of the transmission pipe (4) is connected to the biogas pipe (1-15). After the fan (4-5) is started, the fan (4-5) generates wind force in the forward direction, and then the space behind the transmission pipe (4) is in an adsorption effect. At this time, the adsorption force will drive the sealing plug (4-4) to break away from the fit with the conical position of the transmission pipe (4), and the biogas inside the tank body (1-19) is transferred from the transmission pipe (4) to the collection container, thereby avoiding excessive pressure inside the tank body (1-19); when the pressure inside the tank body (1-19) is too high, the internal air pressure will push the sealing plug (4-4) to slide forward, and the spring (4-2) will shrink synchronously, so that the biogas inside the tank body (1-19) is transferred to the collection container through the internal gap between the ventilation frame (4-3) and the transmission pipe (4), so as to release the pressure inside the tank body (1-19).

[0082] When the biogas fermentation device is used, when it is necessary to pour the fermentation material into the anaerobic fermentation device, the top plate assembly (2) can be moved upward by starting the cylinder A (1-4). The touch block (2-8) on the outside of the top plate assembly (2) will continue to contact the touch slider (1-10). When the top plate assembly (2) moves to a certain height, the contact between the touch slider (1-10) and the touch block (2-8) will be disengaged, the touch slider (1-10) will move upward under the drive of the spring, the transmission plug (1-11) at the bottom of the touch slider (1-10) will be disengaged from the transmission slot (1-9), and the transmission will be released. The transmission plug (1-11) will move toward the top of the tank body (1-19) under the drive of the spring of the transmission joint B (1-14). At this time, the protective block (1-8) is connected end to end, forming a protective circle at the opening of the tank body (1-19) for receiving the spilled material. At this time, the fermented material is poured into the tank body (1-19) through one side of the biogas pipe (1-15). Due to the presence of the protective block (1-8), part of the material will fall onto the protective block (1-8) instead of falling directly onto the top of the tank body (1-19), thereby avoiding the problem of poor sealing when the top plate assembly (2) descends to close the biogas fermentation device.

[0083] When the anaerobic fermentation device needs to be sealed, the cylinder A (1-4) can be started to fix the cylinder A (1-4) and the connecting joint (2-2), thereby driving the top plate assembly (2) to move downward. During the downward movement of the top plate assembly (2), the touch block (2-8) on the outside of the top plate assembly (2) will first touch the touch slider (1-10), causing it to move downward, and the transmission plug block (1-11) at the bottom of the touch slider (1-10) will move along with it. The bottom of the transmission plug block (1-11) is designed with an inclined surface structure and will be inserted into the transmission slot (1-9). The protection slide block (1-7) will be affected by the insertion of the transmission plug block (1-11) into the transmission slot (1-9) and move outward. The protection block (1-8) will move together with the protection slide block (1-7) and detach from the top of the tank body (1-19), thereby removing the obstruction to the top of the tank body (1-19) and preventing the residual material from being located at the connection between the tank body (1-19) and the top plate assembly (2).

[0084] When the top plate assembly (2) covers the tank body (1-19), the fermentation material is heated by starting the heating strip (1-3) so that the fermentation material is at a suitable temperature for fermentation, and then the transmission motor (2-4) is started. The transmission motor (2-4) drives the transmission seat (3-1) to rotate through the transmission head (3-2), so that the stirring shaft (3-3) at the bottom of the transmission seat (3-1) rotates together. The stirring shaft (3-3) has an upper stirring shaft (3-3-1) and a lower stirring shaft (3-3-2), and the spiral blades (3-3-4) on the outer sides of the stirring shaft (3-3-4) rotate in opposite directions due to the cooperation of the bevel gear (3-3-8) and the transmission gear (3-3-9), so that the fermentation material is fully stirred so that the material can be fermented more evenly.

[0085] When the biogas fermentation device is used, its top plate assembly (2) also includes: a transmission bracket (2-1). The transmission bracket (2-1) is symmetrically installed on the top of the top plate assembly (2); one end of the connecting joint (2-2) is designed in an arc structure and is symmetrically fixed on one side of the transmission bracket (2-1); the connecting joint (2-2) is fixedly connected to the piston rod of the cylinder A (1-4); the mounting bracket (2-3) is installed between the top of the biogas fermentation device, and the transmission drive motor (2-4) is installed in the middle of the mounting bracket (2-3), and a hexagonal transmission groove is opened at the bottom of the rotating shaft of the transmission drive motor (2-4). A hexagonal groove is opened at the top position of the transmission motor (2-4), and the hexagonal groove of the transmission motor (2-4) is plugged into the transmission head (3-2). When the top plate assembly (2) descends, the hexagonal groove on the transmission motor (2-4) is plugged into the transmission head (3-2). In order to maintain the biogas fermentation device to produce biogas efficiently, the fermentation control model in the top plate component (2) processes the internal temperature, pH value, pressure, and external temperature data generated by the biogas fermentation device in the current time period, as well as the power data of the transmission motor (2-4) and the heating strip (1-3), and obtains the most suitable power data for adjusting the transmission motor (2-4) and the heating strip (1-3). The server (6) sends relevant power control instructions to the transmission motor (2-4) and the heating strip (1-3) through the network switch (5), so that the biogas fermentation device is in the best production state.

[0086] Although some specific embodiments are given above to illustrate and describe the present invention, it does not mean that the present invention is limited to the various details thereof. On the contrary, various modifications can be made in various details without departing from the spirit of the present invention within the scope and range equivalent to the claims.

Claims

1. A biogas fermentation device based on an LSTM model, comprising a tank assembly (1), a top plate assembly (2), a stirring assembly (3), a protection assembly (1-18) and a server (6), wherein the tank assembly (1) is designed as a circular tank structure, the top plate assembly (2) is slidably arranged on the top of the tank assembly (1), the stirring assembly (3) is arranged below the top plate assembly (2) and is used to stir the material in the tank assembly (1), the top plate assembly (2) is provided with a transmission motor (2-4), a pressure sensor (2-13) and a pH sensor (2-14), a heating strip (1-3) for heating the material is provided in the tank assembly (1), and a biogas collection and transmission pipe (4) is also provided above the tank assembly (1) for transporting the collected and generated biogas, characterized in that: The stirring assembly (3) mainly comprises a stirring shaft (3-3) and a connecting head (3-4); the stirring shaft (3-3) is installed in the connecting head (3-4) through a transmission seat (3-1); a transmission head (3-2) is provided at the upper end of the stirring shaft (3-3) for being matched and connected with a transmission motor (2-4); the stirring shaft (3-3) is divided into an upper stirring shaft (3-3-1) and a lower stirring shaft (3-3-2); the lower stirring shaft (3-3-2) is located below the upper stirring shaft (3-3-1); an upper limit frame (3-3-5) and a lower limit frame (3-3-7) are provided at the connection between the upper stirring shaft (3-3-1) and the lower stirring shaft (3-3-2) A fixed limit rod (3-3-6) for fixing the lower limit frame (3-3-7) is provided on one side of the lower limit frame (3-3-7), and a bevel gear (3-3-8) is provided on the end faces of the upper stirring shaft (3-3-1) and the lower stirring shaft (3-3-2), and the two bevel gears (3-3-8) are movably connected via a transmission gear (3-3-9) fixed on the upper limit frame (3-3-5); when the upper stirring shaft (3-3-1) rotates under the drive of the transmission motor (2-4), the lower stirring shaft (3-3-2) rotates in the opposite direction to the upper stirring shaft (3-3-1) due to the transmission of the transmission gear (3-3-9); The server (6) is provided with a fermentation control model for processing data collected by the biogas fermentation device, calculating the power value for controlling the transmission motor (2-4) and the stirring component (3), and sending corresponding control signals to the transmission motor (2-4) and the stirring component (3) through the network switch (5), so as to put the biogas fermentation device in an optimal production state; Step S101, collecting data: collecting real-time data of the temperature sensor (1-20), the pressure sensor (2-13), the pH sensor (2-14), as well as the external temperature value, the real-time power value of the transmission motor (2-4), the stirring component (3) and the time when the material is put into the tank body (1-19); Step S102, data preprocessing: cleaning the collected data, filling missing values ​​with the average value, and normalizing the data using the maximum and minimum method; Step S103, constructing an LSTM model: inputting the preprocessed data into the LSTM model in time sequence, wherein the model hyperparameters include the number of input features being 6, the hidden layer dimension being 64, the number of LSTM layers being 3, the number of output features being 2, the learning rate being 0.001, the loss function being the mean square error loss function, and the optimizer being Adam; Step S104, training to generate a fermentation control model: the LSTM model of step S103 is trained for 1000 iterations or the training is terminated when the loss error value tends to be stable, and the finally trained model is saved as the fermentation control model; the tank assembly (1) comprises a tank (1-19), and eight trigger assemblies (1-16) are arranged at the upper opening of the tank (1-19); when the trigger assemblies (1-16) are connected end to end, the circular shape formed by them matches the opening of the tank (1-19); the outer side of the trigger assemblies (1-16) is a protective shell (1-6); the top plate assembly (2) is provided with a pressing assembly (2-12) matched with the trigger assemblies (1-16); and the coordinated use of the trigger assemblies (1-16) and the pressing assembly (2-12) can prevent materials from being spilled on the upper opening of the tank (1-19) when pouring materials into the tank (1-19); The transmission pipe (4) is provided with a sealing plug (4-4), a ventilation frame (4-3), a spring (4-2) and a positioning ring (4-1) in sequence from front to back, and a fan (4-5) is provided at the rear end of the positioning ring (4-1). The front end of the interior of the transmission pipe (4) is of a conical design, and the shape of the sealing plug (4-4) is adapted to the shape of the front end of the transmission pipe (4); the positioning ring (4-1) serves to provide a fixed point for the ventilation frame (4-3) to ensure that the ventilation frame (4-3) maintains a correct position in the transmission pipe (4); the positioning ring (4-1) can stabilize the ventilation frame (4-3) so that it does not move in the transmission pipe (4), thereby ensuring that the sealing plug (4-4) can correctly fit the conical rear end of the transmission pipe (4); The protective shell (1-6) is designed in an L-shaped shell structure, and a reinforcement block is added at the connection with the tank body component (1) to improve the structural stability. The protective sliding block (1-7) is a rectangular block structure and can slide inside the protective shell (1-6). The protective block (1-8) adopts an arc block structure design and is integrally arranged on the outer side of the protective sliding block (1-7). Its arc shape matches the tank body (1-19). A sliding connection sliding component (1-17) is provided above the transmission slot (1-9). The transmission slot (1-9) is used to limit the sliding range of the sliding component (1-17). When the sliding component (1-17) slides into the transmission slot (1-9), the protective block (1-8) slides outward along the edge of the tank body (1-19).

2. A biogas fermentation device based on the LSTM model according to claim 1, characterized in that: The top plate assembly (2) comprises a top plate body (2-11) and a connecting assembly (2-10). The top plate body (2-11) is provided with a connecting assembly (2-10) for covering or opening the tank body (1-19). The connecting assembly (2-10) mainly comprises two connecting joints (2-2) which are fixedly mounted in cooperation with the cylinder A (1-4). A transmission bracket (2-1) is provided between the two connecting joints (2-2). A bracket mounting bracket (2-3) is provided inside the transmission bracket (2-1). A transmission motor (2-4) is installed inside the bracket for being connected in cooperation with the stirring assembly (3). The pressing assembly (2-12) is evenly distributed on the top plate body (2-11).

3. A biogas fermentation device based on LSTM model according to claim 2, characterized in that: A support base (1-1) is fixed to the upper half of the tank body (1-19), and the support base (1-1) is fixedly connected to the tank body (1-19) via support columns (1-2) around the tank body (1-19). A discharge pipe (1-5) is provided below the front end of the tank body (1-19) for discharging internal raw materials. A biogas pipe (1-15) is provided above the front end of the tank body (1-19), and the biogas pipe (1-15) is connected to the transmission pipe (4). A cylinder A (1-4) is provided at a symmetrical position above the support base (1-1) for installing a top plate assembly (2). Six heating strips (1-3) are evenly distributed inside the tank body (1-19) and are installed in a circular array to maintain uniform heating of the material. A temperature sensor (1-20) is provided inside the tank body (1-19) to upload the working temperature of the tank body (1-19) to the server (6) in real time.

4. A biogas fermentation device based on LSTM model according to claim 3, characterized in that: The sliding assembly (1-17) comprises a touch slider (1-10) and a transmission plug-in block (1-11). A transmission joint A (1-13) is provided on both sides of the touch slider (1-10), and a spring for resetting the sliding assembly (1-17) is provided thereunder. The size of the transmission slot (1-9) matches that of the transmission plug-in block (1-11) to ensure that the two can work together smoothly.

5. A biogas fermentation device based on LSTM model according to claim 4, characterized in that: The protection component (1-18) comprises a protection block (1-8), a protection slide block (1-7) is integrally connected to the outer side of the protection block (1-8), a transmission slot (1-9) is provided at the top of the protection slide block (1-7), the size of the transmission slot (1-9) is adapted to the sliding component (1-17), a transmission joint B (1-14) is connected to the bottom end of the protection slide block (1-7), and a spring for elastically restoring the protection component (1-18) is provided at the bottom of the transmission joint B (1-14) and the trigger component (1-16).

6. A biogas fermentation device based on an LSTM model according to any one of claims 1 to 5, characterized in that: The top plate assembly (2) also includes a transmission bracket (2-1), which is symmetrically installed on the top of the top plate assembly (2); one end of the connecting joint (2-2) is designed in an arc-shaped structure and is symmetrically fixedly installed on one side of the transmission bracket (2-1); the connecting joint (2-2) is fixedly connected to the piston rod of the cylinder A (1-4); the mounting bracket (2-3) is installed between the top of the biogas fermentation device, and the transmission motor (2-4) is installed in the middle of the mounting bracket (2-3); a hexagonal transmission groove is opened at the bottom of the rotating shaft of the transmission motor (2-4), and a hexagonal groove is opened at the top position of the transmission motor (2-4), and the hexagonal groove of the transmission motor (2-4) is plugged into the transmission head (3-2); when the top plate assembly (2) descends, the hexagonal groove on the transmission motor (2-4) is plugged into the transmission head (3-2).

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