Straw fiber anaerobic fermentation device based on low eutectic solvent pretreatment

Abstract

The application discloses a kind of straw fiber anaerobic fermentation device based on low eutectic solvent pretreatment, belongs to straw anaerobic fermentation technical field, to solve the flange sealing surface corrosion deformation superposition sealing piece aging damage, biogas will be continuously micro-external leakage from gap, traditional means such as soap water inspection, artificial visual observation is difficult to early detection, it can lead to biogas to escape problem, the application includes fermentation tank and the first communication pipe connected in the side of fermentation tank, first communication pipe one end is fixedly installed with first flange, first flange one side is installed with second flange, second flange one side is installed with third communication pipe, the application is driven by motor, gear tooth plate transmission and is scanned around flange whole domain, with gas sensor, can accurately capture the naked eye invisible micro-gap leakage generated by biogas corrosion gasket, flange sealing surface, need not artificial soap water point by point inspection, greatly reduce artificial operation and maintenance intensity, early warning flange corrosion damage fault.

Description

Technical Field

[0001] This invention relates to the field of straw anaerobic fermentation technology, specifically to a straw fiber anaerobic fermentation device based on eutectic solvent pretreatment. Background Technology

[0002] Crop straw is a vast amount of agricultural and forestry organic waste in my country. Traditional direct anaerobic fermentation of straw suffers from drawbacks such as high difficulty in degrading lignocellulose, long fermentation cycles, and low biogas yield. Low-eutectic solvents can efficiently break down lignin and the dense cross-linked structure of cellulose within the straw, stripping away the straw fiber bundles and significantly improving the biodegradability of straw organic matter. This effectively shortens the fermentation cycle and increases biogas yield per unit of straw. It is now being gradually applied on a large scale in complete sets of anaerobic fermentation equipment for straw resource utilization. Flanges are used for detachable and sealed connections between pipe sections, tanks, and valves. Flange gaskets and sealing rings are core sealing components ensuring the airtight delivery of biogas. The fermentation process continuously produces biogas, primarily composed of methane, but also includes highly corrosive media such as high concentrations of water vapor, hydrogen sulfide, and carbon dioxide. The entire pipeline flange system must withstand long-term wet acidic corrosion conditions.

[0003] Current anaerobic fermentation devices for straw fibers based on eutectic solvent pretreatment rely solely on built-in gaskets or sealing rings on the flange end face for static sealing. During long-term operation, irreversible corrosion and leakage defects exist. When corrosion and deformation of the flange sealing surface are combined with the aging and damage of the sealing parts, micron-level micro-gaps will form at the interface between the two. A stable micro-positive pressure exists inside the fermentation system, and biogas will continuously leak out in small amounts from the gaps, forming a continuous unorganized leak. This type of micro-gap leakage cannot be directly identified by the naked eye, and traditional methods such as soapy water inspection and manual visual inspection are difficult to detect in the early stage. The leak will continue for a long time, leading to the escape of biogas.

[0004] To address the above issues, a straw fiber anaerobic fermentation device based on eutectic solvent pretreatment is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide an anaerobic fermentation device for straw fibers based on eutectic solvent pretreatment. By using this device, the problem of continuous and minute leakage of biogas from gaps after corrosion and deformation of the flange sealing surface combined with aging and damage of the sealing parts is solved. Traditional methods such as soap water inspection and manual visual inspection are difficult to detect in the early stage, which leads to the escape of biogas.

[0006] To achieve the above objectives, the present invention provides the following technical solution: An anaerobic fermentation device for straw fiber based on eutectic solvent pretreatment includes a fermentation tank and a first connecting pipe that runs through one side of the fermentation tank. A first flange is fixedly installed at one end of the first connecting pipe, a second flange is installed on one side of the first flange, and a third connecting pipe is installed on one side of the second flange. One end of the third connecting pipe is connected to a gas collection tank. A locking seat is slidably engaged on the surface of the third connecting pipe. A driving component is provided on one side of the locking seat, and a rotating component is rotatably connected to the other side of the locking seat. The output end of the driving component is connected to the rotating component. A detection and sealing component is provided on one side of the rotating component. The driving component can drive the rotating component and the detection and sealing component to rotate circumferentially around the joint of the first and second flanges. An inflatable sealing component is provided inside the rotating component, and the detection and sealing component is connected to the inflatable sealing component. When the detection and sealing component detects a biogas leak signal, it stops at the outer position corresponding to the leak gap between the first and second flanges. With the continuous infusion of biogas, the inflatable sealing component expands and tightly covers and adheres to the joint of the first and second flanges.

[0007] Furthermore, the locking seat includes a fixed plate and a sliding sleeve fixed inside the fixed plate. The sliding sleeve is slidably connected to the surface of the third connecting pipe. A bolt is threadedly connected to one side of the sliding sleeve, and one end of the bolt abuts against the surface of the third connecting pipe.

[0008] Furthermore, the driving component includes a motor and a mounting bracket fixed on both sides of the motor. The output end of the motor is connected through to one side of the mounting plate. The mounting bracket is fixedly connected to the mounting plate. A gear is fixedly installed on the output end of the motor.

[0009] Furthermore, the rotating component includes a rotating frame and a rotating disk fixed to one side of the rotating frame. The rotating disk is rotatably connected to the fixed disk. An annular toothed plate is fixedly installed on one side of the rotating frame. The annular toothed plate is rotatably connected to the fixed disk, and the gear meshes with the annular toothed plate.

[0010] Furthermore, the detection and sealing component includes an electric push rod and a collection shell fixed to the output end of the electric push rod. The electric push rod is fixedly installed inside the rotating frame, and the collection shell is slidably connected to the inside of the rotating frame. A sealing gasket is installed at one end of the collection shell, and a gas sensor is correspondingly installed inside the other end of the collection shell. A Venturi tube is fixedly installed inside the collection shell, and telescopic tubes are connected through both sides of the collection shell and communicate with the Venturi tubes. One end of the telescopic tube is connected to the inflation seal, and a solenoid valve is installed on the surface of the telescopic tube.

[0011] Furthermore, sliders are fixedly installed on both sides of the collection shell, and the sliders are slidably connected to the inside of the rotating frame.

[0012] Furthermore, the inflatable sealing component includes an annular plate and an airbag fixed inside the annular plate. The annular plate is fixedly connected to the rotating frame, and the telescopic tube communicates with the airbag.

[0013] Furthermore, an exhaust device is provided through one side of the rotating frame to actively release the biogas accumulated inside the airbag; The exhaust component includes an exhaust pipe and a control valve mounted on the surface of the exhaust pipe. The exhaust pipe is connected through the rotating frame and one side of the annular plate, and is in communication with the airbag.

[0014] Furthermore, a support frame is fixedly installed on one side of the fermenter, and the gas collection tank is in contact with the support frame.

[0015] Furthermore, a groove is formed on the surface of the third connecting pipe, and the sliding sleeve is slidably connected to the groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Driven by a motor and gear plate transmission, the detection and sealing component rotates around the flange for full-area scanning. Combined with a gas sensor, it can accurately detect micro-leakage that is invisible to the naked eye caused by biogas corrosion of gaskets and flange sealing surfaces. It eliminates the need for manual point-by-point inspection with soap and water, greatly reducing the intensity of manual maintenance and providing early warning of flange corrosion and damage.

[0017] 2. After the leak is detected, the mechanism automatically locks and aligns, using the pressure of the leaking biogas itself to inflate the airbag and complete the sealing of the entire flange.

[0018] 3. By using the detection and sealing components in conjunction with the inflatable sealing components, not only are the single leak points that have been discovered sealed, but the entire mating surface of the first and second flanges is also completely wrapped, preventing secondary leaks from occurring at other weak points in the corrosion of the first and second flanges. Emergency sealing is completed by pressurizing the gas source, realizing the integrated automatic operation of leak detection, location and sealing of the first and second flanges.

[0019] 4. The built-in Venturi tube in the collection shell creates negative pressure to actively draw in leaked biogas, improving the efficiency of gas introduction into the gas bag. The telescopic tube is adapted to the front and back extension and retraction of the collection shell, and will not be pulled, bent or blocked, ensuring that the leaked biogas is completely introduced into the gas bag, improving the sealing and gas recovery effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the fermenter structure of the present invention; Figure 3 for Figure 1 Enlarged view of point A in the middle; Figure 4 for Figure 2 Enlarged view at point B in the middle; Figure 5 This is a schematic diagram of the locking seat structure of the present invention; Figure 6 This is a schematic diagram of the rotating component structure of the present invention; Figure 7 This is a schematic diagram of the structure of the inflatable sealing element of the present invention; Figure 8 for Figure 7 Enlarged view at point C; Figure 9 This is a schematic diagram of the Venturi tube structure of the present invention.

[0021] In the diagram: 1. Fermentation tank; 11. Support frame; 2. First connecting pipe; 3. First flange; 4. Second flange; 5. Third connecting pipe; 51. Slide groove; 6. Gas collection tank; 7. Locking seat; 71. Fixed plate; 72. Sliding sleeve; 73. Bolt; 8. Driving component; 81. Motor; 82. Fixed frame; 83. Gear; 9. Rotating component; 91. Rotating frame; 92. Rotating disk; 93. Annular toothed plate; 10. Detection and sealing component; 101. Electric push rod; 102. Collection shell; 103. Sealing gasket; 104. Gas sensor; 105. Venturi tube; 106. Telescopic tube; 107. Solenoid valve; 108. Slider; 20. Inflatable sealing component; 201. Annular plate; 202. Airbag; 30. Exhaust component; 301. Exhaust pipe; 302. Control valve. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] like Figures 1-4 As shown, an anaerobic fermentation device for straw fibers based on eutectic solvent pretreatment includes a fermenter 1 and a first connecting pipe 2 that runs through one side of the fermenter 1. The fermenter 1 serves as the main reaction body and can complete the anaerobic fermentation reaction of straw fibers pretreated with eutectic solvent. The eutectic solvent can destroy the dense structure of straw lignocellulose, improve the degradation efficiency of organic matter, and increase biogas production. A first flange 3 is fixedly installed at one end of the first connecting pipe 2, and a second flange 4 is installed on one side of the first flange 3. The pipe connection structure of the first flange 3 and the second flange 4 is adopted to realize the segmented disassembly and assembly of the pipe, which facilitates the later maintenance of pipes and tanks, internal cleaning, and replacement of corrosion gaskets, and is suitable for the operation and maintenance needs of long-term continuous production of straw fermentation devices. A third connecting pipe 5 is installed on one side of the second flange 4, and a gas collection tank 6 is connected to one end of the third connecting pipe 5.

[0024] To address the technical problem of continuous, minute-level biogas leakage from gaps, which is difficult to detect early using traditional methods such as soapy water inspections and visual inspection, leading to biogas escape, the following preferred technical solution is provided: like Figures 1-4 As shown, a locking seat 7 is slidably engaged on the surface of the third connecting pipe 5. The locking seat 7 can freely slide along the axial direction of the third connecting pipe 5 to adjust its installation position, facilitating the disassembly of the first flange 3 and the second flange 4. The sliding installation structure is convenient for disassembly and assembly. When gasket replacement or rust removal maintenance is required for the first flange 3 and the second flange 4, the locking seat 7, along with the entire detection and sealing mechanism, can be directly slid away along the pipeline without obstructing or interfering with flange disassembly and assembly operations, significantly reducing the difficulty of daily equipment maintenance. A driving component 8 is provided on one side of the locking seat 7, and a rotating component 9 is rotatably connected to the other side of the locking seat 7. The output end of the driving component 8 is connected to the rotating component 9. A detection and sealing component 10 is provided on one side of the rotating component 9. The driving component 8 can drive the rotating component 9 and the detection and sealing component 10 to rotate circumferentially around the butt joint of the first flange 3 and the second flange 4. The detection and sealing component 10 follows the rotating component 9 to perform a 360° full circumferential rotation scan, completely covering the entire butt joint of the first flange 3 and the second flange 4. The rotating part 9 is equipped with an inflatable sealing element 20 inside, and the detection and sealing element 10 is connected to the inflatable sealing element 20. The detection and sealing element 10 is electrically connected to the driving part 8 through a controller. The controller is existing technology and is not shown in the figure. The detection and sealing element 10 and the inflatable sealing element 20 are connected to form an integrated gas passage. The leaked biogas can be directly introduced into the inflatable sealing element 20 without the need for additional external air pumps, air compressors and other pressurizing equipment. The sealing expansion is completed by the air pressure of the leaking medium itself. When the detection and sealing element 10 collects and identifies the biogas leak signal, it is positioned and stopped at the outer position corresponding to the leak gap of the first flange 3 and the second flange 4. The inflatable sealing element 20 expands and tightly covers and adheres to the joint of the first flange 3 and the second flange 4 through the continuous infusion of biogas. The anaerobic fermentation reaction of straw fiber pretreated with eutectic solvent is completed in fermentation tank 1. Biogas is generated during the reaction. The biogas is transported outward from the first connecting pipe 2 that runs through the side wall of fermentation tank 1, flows through the first flange 3 fixed at the end of the first connecting pipe 2, the second flange 4 that is connected to it, and then through the third connecting pipe 5 connected to the second flange 4. Finally, it is sent into the gas collection tank 6 for centralized storage, completing the unified collection of fermented biogas, which is convenient for subsequent purification, combustion, power generation and resource utilization. Under normal inspection conditions, the drive component 8 continuously outputs power, driving the rotating component 9 and the detection and sealing component 10 to perform a 360° circumferential scanning motion around the joint of the first flange 3 and the second flange 4 with the axis of the third connecting pipe 5 as the center. The detection and sealing component 10 collects the gas concentration signal around the flange joint in real time, which can cover the first flange 3 and the second flange 4, and can detect the micro-leakage caused by biogas corrosion of gaskets and sealing rings without dead angles. It can accurately identify the tiny leakage points that are difficult to be found by manual inspection. When the detection and sealing component 10 detects that the biogas concentration exceeds the standard and identifies the leakage signal, the controller sends a shutdown command to the drive component 8. The drive component 8 immediately stops outputting power and locks the rotating component 9, so that the detection and sealing component 10 is accurately stopped at the outer position corresponding to the leakage gap of the first flange 3 and the second flange 4, completing the automatic location of the leakage point without the need for manual on-site search. The rotating component 9 is equipped with an inflatable sealing component 20. The internal cavity of the detection and sealing component 10 and the inflatable sealing component 20 are interconnected to form a biogas flow channel. The biogas leaking from the gap of the first flange 3 and the second flange 4 is directly introduced into the cavity of the inflatable sealing component 20 through the internal air intake channel of the detection and sealing component 10. As the leaked biogas continues to be filled, the internal air pressure of the inflatable sealing component 20 continues to rise, causing it to gradually expand and extend, tightly covering and adhering to the overall butt joint surface of the first flange 3 and the second flange 4. The system achieves adaptive compression by relying on the pressure of the leaking biogas itself. The greater the amount of gas leakage in the gap, the higher the internal pressure of the inflatable seal 20, and the stronger the compression force between it and the joint of the first flange 3 and the second flange 4. By detecting the cooperation between the plugging component 10 and the inflatable seal 20, it not only seals the single leak point that has been found, but also completely wraps the entire mating surface of the first flange 3 and the second flange 4, preventing secondary leakage at other weak corrosion locations of the first flange 3 and the second flange 4. Emergency sealing is completed by pressurizing the gas source, realizing the integrated automatic operation of leak detection, positioning and sealing of the first flange 3 and the second flange 4.

[0025] A support frame 11 is fixedly installed on one side of the fermenter 1, and the gas collection tank 6 is in contact with the support frame 11. The support frame 11 can provide reliable lateral support and support limit for the suspended gas collection tank 6, effectively sharing the weight of the gas collection tank 6 and the vibration load caused by the pressure fluctuation of biogas inside the tank.

[0026] like Figure 5 As shown, a groove 51 is provided on the surface of the third connecting pipe 5. The sliding sleeve 72 is slidably connected to the groove 51. The groove 51 plays a role in circumferential limiting and axial guiding of the sliding sleeve 72, which can effectively limit the circumferential rotation and left and right deflection of the sliding sleeve 72. The locking seat 7 includes a fixed plate 71 and a sliding sleeve 72 fixed inside the fixed plate 71. The sliding sleeve 72 is slidably connected to the surface of the third connecting pipe 5. A bolt 73 is threadedly connected to one side of the sliding sleeve 72, and one end of the bolt 73 abuts against the surface of the third connecting pipe 5. The relative position of the sliding sleeve 72 and the third connecting pipe 5 is locked by the friction force generated by the bolt 73 tightening, which restricts the axial sliding of the sliding sleeve 72 and prevents the locking seat 7 from shifting or deviating during inspection and sealing operations. When the first flange 3 and the second flange 4 need to be inspected or the gaskets replaced, the bolt 73 is loosened in the opposite direction. The end of the bolt 73 is removed from the outer wall of the third connecting pipe 5, and the sliding sleeve 72 is released from the locking state. It can slide and move again along the axial direction of the third connecting pipe 5 to avoid the inspection and operation space of the first flange 3 and the second flange 4. The drive unit 8 includes a motor 81 and a mounting bracket 82 fixed on both sides of the motor 81. The output end of the motor 81 is connected through to one side of the mounting plate 71. The mounting bracket 82 is fixedly connected to the mounting plate 71. A gear 83 is fixedly installed on the output end of the motor 81. The motor 81, the mounting brackets 82 on both sides and the gear 83 cooperate to form an integrated drive structure. The mounting plate 71 provides stable support and power output, which can stably drive the detection and sealing component 10 to complete the 360° fully automatic roving leakage detection of the flange. It can also quickly and accurately locate the leak point after the leak is detected, providing a reliable power foundation for the self-pressurized sealing of the inflatable sealing component 20.

[0027] like Figures 5-8 As shown, the rotating component 9 includes a rotating frame 91 and a rotating disk 92 fixed to one side of the rotating frame 91. The rotating disk 92 is rotatably connected to the fixed disk 71. An annular toothed plate 93 is fixedly installed on one side of the rotating frame 91. The annular toothed plate 93 is rotatably connected to the fixed disk 71, and a gear 83 meshes with the annular toothed plate 93. During inspection, the motor 81 starts and drives the gear 83 to rotate continuously. The gear 83 drives the annular toothed plate 93 to rotate in the circumferential direction by the meshing of its teeth. The annular toothed plate 93 synchronously drives the rotating frame 91 and the rotating disk 92 together in a third direction. The central axis of the connecting pipe 5 rotates around the flange. The outer side of the rotating frame 91 is equipped with a detection and sealing component 10, which scans 360° around the joint between the first flange 3 and the second flange 4 synchronously with the rotating component 9. When the detection and sealing component 10 collects a biogas leak signal, the controller controls the motor 81 to brake immediately, the gear 83 stops rotating, and the meshing limit action locks the annular toothed plate 93, so that the rotating frame 91 and the detection and sealing component 10 are precisely stopped outside the leak gap and remain in place, providing stable support for the expansion and sealing of the inflatable sealing component 20.

[0028] To address the technical problem of continuous, unorganized leakage of biogas due to the formation of micron-sized gaps at the interface between the sealing surfaces of the first flange 3 and the second flange 4 after corrosion, deformation, aging, and damage, and the existence of a stable micro-positive pressure inside the fermentation system, the following preferred technical solution is provided: like Figure 8 and Figure 9As shown, the detection and sealing component 10 includes an electric push rod 101 and a collection shell 102 fixed to the output end of the electric push rod 101. The electric push rod 101 is fixedly installed inside the rotating frame 91, and the collection shell 102 is slidably connected to the inside of the rotating frame 91. A sealing gasket 103 is installed at one end of the collection shell 102. The sealing gasket 103 fits against the outer wall of the first flange 3 and the second flange 4 to form an annular sealed cavity, which can completely contain all the biogas leaking from the gaps of the first flange 3 and the second flange 4, blocking the unorganized diffusion of biogas into the plant and controlling the emission of waste gas from the source. The sealing gasket 103 is made of a special anti-corrosion material that is resistant to hydrogen sulfide and water vapor corrosion, and is completely covered on the end face of the collection shell 102. A gas sensor 104 is correspondingly installed inside one end of the collection shell 102. A Venturi tube 105 is fixedly installed inside the collection shell 102. The Venturi tube 105 accelerates the delivery of biogas to the inflatable sealing component 20 and shortens the time for the inflatable sealing component 20 to expand to an effective sealing state. In the meantime, a self-pressurizing seal is quickly formed, reducing the duration of gas leakage. The collection shell 102 is connected to both sides by a telescopic tube 106, which is connected to a venturi tube 105. The telescopic tube 106 has the ability to expand and contract, which can adapt to the stroke changes of the collection shell 102 sliding back and forth. It will not break the pipeline due to the extension and retraction of the collection shell 102. One end of the telescopic tube 106 is connected to the inflation seal 20. A solenoid valve 107 is installed on the surface of the telescopic tube 106. During normal inspection, the electric push rod 101 is in the retracted state, which drives the collection shell 102 to slide inward along the inside of the rotating frame 91, so that the collection shell 102, the front sealing gasket 103 and the first flange 3 and the second flange 4 are kept at a gap and do not contact the outer wall of the flange. When the rotating frame 91 rotates 360° around the flange, the gas sensor 104 at the end of the collection shell 102 continuously collects the air gas concentration around the first flange 3 and the second flange 4 to monitor in real time whether there is biogas leakage. When the gas sensor 104 detects that the biogas concentration exceeds the standard and transmits a leak signal to the controller, the controller first controls the motor 81 to stop and lock the rotating frame 91, so that the collection shell 102 is aligned with the outside of the flange leak gap. Then the controller starts the electric push rod 101 to extend. The output end of the electric push rod 101 pushes the collection shell 102 to slide outward along the rotating frame 91 until the front sealing gasket 103 of the collection shell 102 is tightly pressed against the outer periphery of the flange joint. The sealing gasket 103 and the outer wall of the first flange 3 and the second flange 4 form a sealed receiving cavity, completely covering the leak gap. After the collecting shell 102 wraps around the flange, the controller opens the solenoid valve 107 on the telescopic pipe 106; the biogas leaking from the flange gap flows into the inner cavity of the collecting shell 102 under the action of the slight positive pressure of the pipeline, and the airflow flows through the internal Venturi tube 105. The gas flow efficiency is improved by utilizing the Venturi negative pressure effect. The biogas is continuously transported to the inflatable sealing element 20 inside the rotating part 9 through the connected telescopic pipe 106; as biogas is continuously filled in, the internal air pressure of the inflatable sealing element 20 increases and expands, and it tightly adheres to the joint of the first flange 3 and the second flange 4 to achieve adaptive sealing and leak plugging.

[0029] like Figure 9 As shown, sliders 108 are fixedly installed on both sides of the collection shell 102, and the sliders 108 are slidably connected to the inside of the rotating frame 91. The sliders 108 play a bidirectional precise limiting and guiding role for the extension and retraction of the collection shell 102, so that the collection shell 102 can only extend and retract smoothly along the preset straight trajectory, preventing problems such as skewing, jamming and deviation during the pushing process of the electric push rod 101, ensuring that the collection shell 102 can accurately align with the flange leakage gap each time it extends, ensuring the accurate fit of the sealing gasket 103, and improving the accuracy and stability of leakage coverage and sealing.

[0030] like Figure 7 and Figure 8 As shown, the inflatable sealing component 20 includes an annular plate 201 and an airbag 202 fixed inside the annular plate 201. The airbag 202 is made of a corrosion-resistant material that is resistant to hydrogen sulfide, water vapor, and acids and alkalis. It can adapt to the special working conditions of high corrosion and high humidity of straw anaerobic fermentation biogas for a long time. It is not prone to swelling, hardening, cracking, aging failure, and ensures long-term stable elastic sealing performance. The annular plate 201 is fixedly connected to the rotating frame 91, and the telescopic tube 106 is connected to the airbag 202. The telescopic tube 106 is directly connected to the inside of the airbag 202, which can smoothly guide the flange leakage biogas collected by the collection shell 102 into the airbag 202. It does not require an external gas source or hydraulic power and relies on the pressure of the leakage biogas itself to achieve self-inflation. An integrated pressure sensor is installed inside the airbag 202, which can collect the inflation pressure data inside the airbag 202 in real time and transmit the pressure signal to the controller in real time. The pressure sensor and the solenoid valve 107 on the telescopic tube 106 form a closed-loop electrical linkage control through the controller. When the air pressure inside the airbag 202 is lower than the preset sealing pressure threshold, the controller keeps the solenoid valve 107 open and continuously introduces leaked biogas to replenish the pressure, ensuring that the airbag 202 always maintains sufficient sealing and pressing force. When the internal pressure of the airbag 202 reaches the safety upper limit threshold, the controller immediately controls the solenoid valve 107 to close, stopping the continued air intake, avoiding the airbag 202 from overpressure expansion and deformation, bulging and rupture, or being pushed off in the opposite direction, realizing intelligent, dynamic and constant control of the inflation pressure of the airbag 202. The controller controls the solenoid valve 107 to close to stop the air intake. At this time, the collection shell 102 is still continuously pressed and locked by the electric push rod 101, and with the end anti-corrosion sealing gasket 103 tightly covering the flange leakage position, it always maintains a sealed covering state and will not loosen and reset when the air passage is closed.

[0031] like Figure 6 and Figure 7 As shown, a venting component 30 is provided through one side of the rotating frame 91, which can actively release the biogas accumulated inside the airbag 202. The venting component 30 includes a vent pipe 301 and a control valve 302 installed on the surface of the vent pipe 301. The vent pipe 301 is connected through the rotating frame 91 and one side of the annular plate 201, and the vent pipe 301 is connected to the airbag 202. During normal inspection and emergency sealing operations, the control valve 302 remains in a normally closed state, blocking the passage of the vent pipe 301, ensuring that the biogas pressure inside the airbag 202 can be normally accumulated and maintained stably, so that the airbag 202 continuously fits the joint of the first flange 3 and the second flange 4 to maintain a sealed state, and there will be no situation of pressure leakage or sealing failure. When the leakage problem of the first flange 3 and the second flange 4 is repaired and no further sealing work is required, the control valve 302 is manually opened through the connection between the additional storage tank and the exhaust pipe 301. The high-pressure biogas accumulated inside the airbag 202 is discharged into the external storage tank through the exhaust pipe 301 for centralized recovery. The internal pressure of the airbag 202 gradually decreases, and the airbag 202 contracts and resets, releasing the compression and covering constraint on the joint of the first flange 3 and the second flange 4. After the pressure is released, the electric push rod 101 can retract normally to drive the collection shell 102 to reset. The entire set of rotating parts 9 returns to the initial standby position and is put back into normal 360° inspection work, realizing the cyclic reuse of the mechanism.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A straw fiber anaerobic fermentation device based on low eutectic solvent pretreatment, comprising a fermentation tank (1) and a first communication pipe (2) connected through one side of the fermentation tank (1), one end of the first communication pipe (2) is fixedly installed with a first flange (3), one side of the first flange (3) is installed with a second flange (4), one side of the second flange (4) is installed with a third communication pipe (5), one end of the third communication pipe (5) is communicated with a gas collection tank (6), characterized in that: The third connecting pipe (5) is slidably snapped with a locking seat (7). A driving member (8) is provided on one side of the locking seat (7). A rotating member (9) is rotatably connected to one side of the locking seat (7). The output end of the driving member (8) is connected to the rotating member (9) in a transmission connection. A detection sealing member (10) is provided on one side of the rotating member (9). The driving member (8) can drive the rotating member (9) and the detection sealing member (10) to rotate circumferentially around the butt joint of the first flange (3) and the second flange (4). An inflatable sealing member (20) is provided inside the rotating member (9). The detection sealing member (10) is connected to the inflatable sealing member (20). When the detection sealing member (10) collects and identifies the biogas leakage signal, it positions itself and stops at the outer position corresponding to the leakage gap of the first flange (3) and the second flange (4). The inflatable sealing member (20) expands and tightly covers and adheres to the butt joint of the first flange (3) and the second flange (4) through the continuous infusion of biogas.

2. The straw fiber anaerobic fermentation device based on eutectic solvent pretreatment according to claim 1, characterized in that: The locking seat (7) includes a fixed plate (71) and a sliding sleeve (72) fixed inside the fixed plate (71). The sliding sleeve (72) is slidably connected to the surface of the third connecting pipe (5). A bolt (73) is threadedly connected to one side of the sliding sleeve (72), and one end of the bolt (73) abuts against the surface of the third connecting pipe (5).

3. The straw fiber anaerobic fermentation device based on eutectic solvent pretreatment according to claim 2, characterized in that: The drive unit (8) includes a motor (81) and a fixed frame (82) fixed on both sides of the motor (81). The output end of the motor (81) is connected through to one side of the fixed plate (71). The fixed frame (82) is fixedly connected to the fixed plate (71). A gear (83) is fixedly installed on the output end of the motor (81).

4. The straw fiber anaerobic fermentation device based on eutectic solvent pretreatment according to claim 3, characterized in that: The rotating component (9) includes a rotating frame (91) and a rotating disk (92) fixed on one side of the rotating frame (91). The rotating disk (92) is rotatably connected to the fixed disk (71). An annular toothed plate (93) is fixedly installed on one side of the rotating frame (91). The annular toothed plate (93) is rotatably connected to the fixed disk (71), and the gear (83) meshes with the annular toothed plate (93).

5. The straw fiber anaerobic fermentation device based on eutectic solvent pretreatment according to claim 4, characterized in that: The detection sealing component (10) includes an electric push rod (101) and a collection shell (102) fixed at the output end of the electric push rod (101). The electric push rod (101) is fixedly installed inside the rotating frame (91). The collection shell (102) is slidably connected to the inside of the rotating frame (91). A sealing gasket (103) is installed at one end of the collection shell (102). A gas sensor (104) is correspondingly installed inside one end of the collection shell (102). A venturi tube (105) is fixedly installed inside the collection shell (102). Telescopic tubes (106) are connected through both sides of the collection shell (102), and the telescopic tubes (106) are connected to the venturi tubes (105). One end of the telescopic tube (106) is connected to the inflation sealing component (20). A solenoid valve (107) is installed on the surface of the telescopic tube (106).

6. The straw fiber anaerobic fermentation device based on eutectic solvent pretreatment according to claim 5, characterized in that: The collecting shell (102) is fixedly installed with sliders (108) on both sides, and the sliders (108) are slidably connected to the inside of the rotating frame (91).

7. The straw fiber anaerobic fermentation device based on eutectic solvent pretreatment according to claim 6, characterized in that: The inflatable sealing element (20) includes an annular plate (201) and an airbag (202) fixed inside the annular plate (201). The annular plate (201) is fixedly connected to the rotating frame (91), and the telescopic tube (106) is connected to the airbag (202).

8. The straw fiber anaerobic fermentation device based on eutectic solvent pretreatment according to claim 7, characterized in that: The rotating frame (91) is provided with an exhaust device (30) through one side, which can actively depressurize and discharge the biogas stored inside the airbag (202). The exhaust component (30) includes an exhaust pipe (301) and a control valve (302) installed on the surface of the exhaust pipe (301). The exhaust pipe (301) is connected through the rotating frame (91) and the annular plate (201) on one side, and the exhaust pipe (301) is connected to the airbag (202).

9. The straw fiber anaerobic fermentation device based on eutectic solvent pretreatment according to claim 1, characterized in that: A support frame (11) is fixedly installed on one side of the fermenter (1), and the gas collection tank (6) is in contact with the support frame (11).

10. The straw fiber anaerobic fermentation device based on eutectic solvent pretreatment according to claim 3, characterized in that: The surface of the third connecting pipe (5) is provided with a sliding groove (51), and the sliding sleeve (72) is slidably connected to the sliding groove (51).

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