A harmless treatment device for livestock and poultry breeding waste

Abstract

This invention discloses a harmless treatment device for livestock and poultry breeding waste, belonging to the field of anaerobic treatment technology. To address the problem of biogas suffocation during biogas digester use, leading to a significant reduction in effective gas production and affecting digester safety, as well as poor gas-liquid separation during gas collection and severe liquid contamination in biogas, resulting in low pure gas capture rates, the invention includes a biogas digester body and an inlet connected to one side of the digester body. A skylight cover is fixed to the upper center of the digester body, and ventilation ports are provided on both sides of the bottom surface of the skylight cover. This invention enables the collection and circulation of biogas from within the liquid. Combined with the ventilation ports and guide pipes, it collects and circulates the naturally rising biogas within the digester body, improving biogas collection efficiency while preventing scum and foam from covering the gas-liquid interface, thus avoiding suffocation of biogas and affecting biogas collection efficiency and pressure safety within the digester body.

Description

Technical Field

[0001] This invention relates to the field of anaerobic treatment technology, specifically to a device for the harmless treatment of livestock and poultry breeding waste. Background Technology

[0002] The harmless treatment device for livestock and poultry breeding waste is designed to treat livestock and poultry breeding waste, such as manure and bedding. Biogas digesters are the mainstream equipment for the harmless treatment and resource utilization of livestock and poultry breeding waste. Biogas digesters utilize anaerobic fermentation technology to decompose organic matter through microorganisms under anaerobic conditions, ultimately producing biogas whose main component is methane, thereby achieving the harmless treatment of breeding waste.

[0003] Currently, in the operation of biogas digesters for livestock and poultry waste, the gas-liquid interface is easily completely covered by scum and foam, forming a sealed layer. This prevents the biogas produced at the bottom from rising and escaping normally, resulting in suffocation and a significant reduction in effective gas production. Simultaneously, the gas pressure inside the digester rises abnormally, affecting the digester's safety. Furthermore, the scum easily hardens and forms a permanent crust that is difficult to break down naturally, also affecting biogas collection and the digester's safety. In addition, poor gas-liquid separation during biogas collection and significant liquid carryover in the biogas easily lead to low pure gas capture rates and poor system stability.

[0004] To address the above problems, a harmless treatment device for livestock and poultry breeding waste is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a harmless treatment device for livestock and poultry breeding waste. By using this invention, the problems of biogas suffocation during use are solved, which leads to a significant reduction in effective gas production and affects the safety of the biogas digester. At the same time, the poor gas-liquid separation effect and serious liquid carryover in biogas during gas collection can easily result in a low pure gas capture rate.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a harmless treatment device for livestock and poultry breeding waste, comprising a biogas digester body and an inlet connected to one side of the biogas digester body, a skylight cover fixed at the upper middle part of the biogas digester body, and ventilation openings provided on both sides of the bottom surface of the skylight cover, and a gas collection chamber opened in the middle of the inner side of the skylight cover, and a water pressure chamber connected to the rear of the biogas digester body;

[0007] A guide pipe is connected to one side of the top of the skylight cover. The output end of the guide pipe is connected to an air extraction mechanism, and the output end of the air extraction mechanism is connected to a gas collection tank. An air outlet valve pipe is installed on one side of the gas collection tank. An air suction mechanism runs through the middle of the skylight cover. A scum layer is provided inside the main body of the biogas digester.

[0008] Furthermore, the air extraction mechanism includes a demister box connected to the guide pipe, and an air extraction pump is connected to one side of the demister box.

[0009] Furthermore, one side of the air pump is connected to an air guide pipe, and the output end of the air guide pipe is connected to a diversion tank. The top of the diversion tank is connected to an air guide pipe, and the output end of the air guide pipe is connected to a gas collection tank.

[0010] Furthermore, the air intake mechanism includes a main flow pipe connected to the demister box, and a branch pipe is connected to the bottom of the main flow pipe.

[0011] Furthermore, the bottom surface of the branch pipe is equipped with several air intakes, and each group of air intakes has a permeable layer fixed on its surface.

[0012] Furthermore, the circulation mechanism includes a return pipe connected to the gas collection tank, and a suction pump is installed on one side of the return pipe.

[0013] Furthermore, the output end of the return pipe is connected to a shunt pipe, and one side of the shunt pipe is connected to multiple sets of connecting pipes.

[0014] Furthermore, a slag-breaking mechanism is provided above the air intake mechanism. The slag-breaking mechanism includes an air filling pipe connected to the connecting pipe, and a piston disc is slidably disposed above the inner wall of the air filling pipe.

[0015] Furthermore, a rotating seat is installed at the upper center of the piston disc, and a lifting rod is installed at the upper center of the rotating seat. The lifting rod is rotatably connected to the piston disc through the rotating seat. A slag-breaking disc is fixed at the top of the lifting rod. A support spring is fixed on the upper surface of the piston disc, and the piston disc is elastically connected to the air-filling pipe through the support spring. A spiral groove is provided at the center of the outer surface of the lifting rod, and the lifting rod is spirally connected to the air-filling pipe through the spiral groove.

[0016] Furthermore, a cover is fixed above the outer surface of the lifting rod, and the bottom end of the cover is fixed to the outer surface of the inflation tube. Several support rods are fixed above the outer surface of the inflation tube, and a float is fixed at the top of each set of support rods. Several connecting sleeves are fixed below the outer surface of the inflation tube. A one-way pressure valve is connected to the bottom of each set of inflation tubes, and the bottom of the one-way pressure valve is connected to the branch pipe.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention utilizes the cyclone separation effect of the demister and the diversion tank to double-capture water vapor in the biogas during its flow. This helps ensure the purity of the subsequently collected biogas, guarantee the calorific value and utilization rate of the biogas when it is released for use, avoid the problem of liquid accumulation caused by high water vapor content during collection, and reduce the interference and corrosion of water vapor on subsequent components such as the air pump.

[0018] 2. This invention enables the collection and circulation of biogas from within the liquid. In conjunction with the vent and guide pipe, it collects and circulates the naturally rising biogas within the biogas digester. This improves biogas collection efficiency while preventing scum and foam from covering the gas-liquid interface, which would suffocate the biogas and affect the biogas collection effect and the pressure safety within the biogas digester.

[0019] 3. This invention can break the scum layer covering the biogas digester, which helps to break the obstruction of biogas rising due to the scum layer, improves the efficiency of biogas collection, and can also cause some disturbance to the scum, thereby preventing the scum layer from solidifying and hardening. At the same time, the breaking action is relatively gentle, which will not cause violent fluctuations in the gas-liquid interface in the biogas digester, thus avoiding the problem of more foam caused by large fluctuations in the liquid surface, and will not affect the fermentation process in the biogas digester, ensuring the stability of fermentation in the biogas digester. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall external three-dimensional structure of the present invention; Figure 2 This is a cross-sectional three-dimensional structural diagram of the biogas digester body of the present invention; Figure 3 This is a partial cross-sectional perspective view of the three-dimensional structure of the distribution pipe of the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of a half-branch pipe according to the present invention; Figure 5 This is a schematic diagram of the three-dimensional structure of half of the air tube of the present invention; Figure 6 This is a partial cross-sectional three-dimensional structural diagram of the inflation tube and branch tube of the present invention. Figure 7 For the present invention Figure 6 Enlarged structural diagram at point A in the middle; Figure 8 For the present invention Figure 6 Enlarged structural diagram at point B; Figure 9 This is a bottom-view three-dimensional structural diagram of the air tube of the present invention.

[0021] In the diagram: 1. Main body of the biogas digester; 2. Inlet; 3. Skylight cover; 4. Vent; 5. Air extraction mechanism; 51. Demisting box; 52. Air extraction pump; 53. Air guide pipe one; 54. Diverter tank; 55. Air guide pipe two; 6. Gas collection tank; 7. Suction mechanism; 71. Main circulation pipe; 72. Branch pipe; 73. Suction port; 74. Permeable layer; 8. Circulation mechanism; 81. Return pipe; 82. Suction pump; 83. Branch pipe; 84. Flow pipe; 9. Connecting pipe; 9. Slag breaking mechanism; 91. Air filling pipe; 92. Piston disc; 93. Rotating seat; 94. Lifting rod; 95. Slag breaking disc; 96. Support spring; 97. Spiral groove; 98. Wrapping sleeve; 99. Support rod; 910. Float ball; 10. One-way pressure valve; 20. Air collecting chamber; 30. Connecting sleeve; 40. Slag layer; 50. Water pressure chamber; 60. Air outlet valve pipe; 70. Guide pipe. 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] To address the technical problems of poor gas-liquid separation and severe liquid carryover in biogas during gas collection, which easily leads to low pure gas capture rates, such as... Figure 1 - Figure 4 As shown, the following preferred technical solutions are provided: A harmless treatment device for livestock and poultry breeding waste includes a biogas digester body 1 and an inlet 2 connected to one side of the biogas digester body 1. During treatment, the sealing cover at the top of the existing inlet 2 is opened, and the livestock and poultry breeding waste is added into the existing biogas digester body 1 through the inlet 2. The breeding waste undergoes an anaerobic reaction in the biogas digester body 1 to produce biogas. A skylight cover 3 is fixed at the upper middle part of the biogas digester body 1, and ventilation ports 4 are provided on both sides of the bottom surface of the skylight cover 3. A gas collection chamber 20 is opened in the middle of the inner side of the skylight cover 3. The top of the biogas digester body 1 is an arc-shaped surface, so that the biogas generated in the biogas digester body 1 will automatically rise and flow, allowing the biogas to pass through the ventilation ports 4 and enter the gas collection chamber 20. A water pressure chamber 50 is connected to the rear of the biogas digester body 1. The existing water pressure chamber 50 is used to balance the pressure of the gas produced in the biogas digester body 1.

[0024] A guide pipe 70 is connected to one side of the top of the skylight cover 3. The output end of the guide pipe 70 is connected to the suction mechanism 5, and the output end of the suction mechanism 5 is connected to the gas collection tank 6. The suction mechanism 5 is connected to the gas collection chamber 20 through the guide pipe 70, and the suction mechanism 5 is equipped with suction power so that the biogas flowing from the air inlet 4 into the gas collection chamber 20 can be finally sucked into the gas collection tank 6 for collection through the guide pipe 70. An outlet valve pipe 60 is installed on one side of the gas collection tank 6. The outlet valve pipe 60 consists of an outlet pipe and a solenoid valve installed on the pipe. The gas collection tank 6 is a pressure storage tank that can store biogas at a certain pressure. Using an external controller based on existing principles, the solenoid valve on the outlet valve pipe 60 can be opened, so that the biogas collected in the gas collection tank 6 can be released for use. The controller based on existing principles is not shown in the figure. A suction mechanism 7 runs through the middle of the skylight cover 3. A scum layer 40 is installed inside the biogas digester body 1. This scum layer 40 is formed by the floating of low-density materials such as straw and forage from livestock waste. Under normal conditions, the scum layer 40 does not completely cover the liquid surface inside the biogas digester body 1. The connection between the suction mechanism 7 and the skylight cover 3 is sealed to ensure the airtightness of the biogas digester body 1. The bottom suction end of the suction mechanism 7 is located in the upper liquid surface inside the biogas digester body 1, below the scum layer 40. The top of the suction mechanism 7, protruding from the skylight cover 3, is also connected to the extraction mechanism 5. The suction power within the extraction mechanism 5 generates a negative pressure within the suction mechanism 7, allowing the bottom suction end of the suction mechanism 7 to... The suction mechanism 7 has a gas-liquid separation structure at its bottom suction end. This allows the biogas rising from the bottom of the biogas digester body 1 to the upper liquid surface, as well as the biogas trapped in the liquid at the bottom of the scum layer 40, to be collected and circulated from the liquid using the suction mechanism 7 and the extraction mechanism 5. Ultimately, the biogas is collected into the gas collection tank 6. This enables the collection and circulation of naturally rising biogas within the biogas digester body 1 through the air inlet 4 and the guide pipe 70, as well as the simultaneous collection and circulation of biogas within the liquid using the suction mechanism 7. This improves biogas collection efficiency while preventing the scum layer 40 and foam from covering the gas-liquid interface, which could trap the biogas and affect the collection effect and safety within the biogas digester body 1.

[0025] The extraction mechanism 5 includes a demister 51 connected to the guide pipe 70, and an extraction pump 52 is connected to one side of the demister 51. The extraction pump 52 is connected to the side of the demister 51 away from the guide pipe 70 via a pipe, and the extraction pump 52 can extract biogas from the demister 51 via the pipe, so that the biogas flowing from the air inlet 4 into the gas collection chamber 20 can flow through the demister 51 via the flow of the guide pipe 70. Using the existing principle, the demister 51 can capture water vapor in the biogas during the biogas flow, which helps to ensure the purity of the biogas collected later, avoids the problem of liquid accumulation when the water vapor content is high during collection, and reduces the interference and corrosion of water vapor on the extraction pump 52 and other subsequent components.

[0026] One side of the vacuum pump 52 is connected to a first air guide pipe 53, and the output end of the first air guide pipe 53 is connected to a diverter tank 54. The inner wall of the first air guide pipe 53 and the diverter tank 54 are tangentially connected, allowing the airflow in the first air guide pipe 53 to enter the diverter tank 54 tangentially. The diverter tank 54 is a cyclone separator based on existing principles. The top of the diverter tank 54 is connected to a second air guide pipe 55, and the output end of the second air guide pipe 55 is connected to the gas collecting tank 6. The air is then accelerated and extracted by the vacuum pump 52. After the biogas enters the diversion tank 54 tangentially, the liquid in the biogas is separated by the swirling separation effect of the diversion tank 54. The separated liquid is discharged from the bottom of the diversion tank 54, and the separated biogas is collected in the gas collection tank 6 through the gas guide pipe 55. This secondary separation and dehumidification of biogas by the diversion tank 54 helps to further ensure the purity of the collected biogas and ensure the calorific value and utilization rate of the biogas when it is released from the gas outlet valve pipe 60.

[0027] To address the technical issues that arise during biogas digester use, such as the phenomenon of biogas suffocation leading to a significant reduction in effective gas production and affecting the safety of the digester, such as... Figure 1 - Figure 4 , Figure 6 and Figure 7 As shown, the following preferred technical solutions are provided: The air intake mechanism 7 includes a main flow pipe 71 connected to the demister box 51. The middle part of the main flow pipe 71 is a corrosion-resistant, retractable hose. The main flow pipe 71 extends out of the skylight cover 3 and connects to the demister box 51. The penetration part between the main flow pipe 71 and the skylight cover 3 is sealed to ensure the airtightness of the biogas digester body 1. The bottom of the main flow pipe 71 is connected to a branch pipe 72, which is composed of multiple sets of pipes. The air pump 52 draws air from the demister box 51 and the main flow pipe 71, thereby creating negative pressure in the main flow pipe 71.

[0028] Several air intakes 73 are installed on the bottom surface of the branch pipe 72. The dry air intakes 73, the branch pipe 72, and the main flow pipe 71 are all made of corrosion-resistant materials. Each set of air intakes 73 has a fixed breathable layer 74 on its surface. The breathable layer 74 consists of an outer metal filter and an inner waterproof and breathable membrane. The waterproof and breathable membrane is made of expanded polytetrafluoroethylene with a microporous structure. The metal filter protects the inner waterproof and breathable membrane, allowing only gas to pass through the air intakes 73 using the breathable layer 74. The suction generated inside the main circulation pipe 71 will not damage the waterproof and breathable membrane. At the same time, the air intake 73 is located in the upper liquid surface inside the biogas digester body 1 and is located below the scum layer 40. Thus, when the air pump 52 draws from the main circulation pipe 71, the biogas rising from the bottom inside the biogas digester body 1 to the upper liquid surface, as well as the biogas trapped in the liquid at the bottom of the scum layer 40, can be collected and circulated from the liquid by the suction separation of the air intake 73 and the breathable layer 74.

[0029] Finally, the biogas is collected into the gas collection tank 6, and together with the vent 4 and the guide pipe 70, the naturally rising biogas in the biogas digester body 1 is collected. This improves the biogas collection efficiency and avoids the problem of scum layer 40 and foam covering the gas-liquid interface, which would suffocate the biogas and affect the collection effect and the pressure safety in the biogas digester body 1. The air intake 73 is set in an inverted cone shape, so that when the liquid in the biogas digester body 1 passes through the air intake 73, the inclined surface of the inverted cone allows the liquid and residue to flow upward, which can reduce the possibility of residue adhering to the air intake 73 and ensure the ventilation effect of the air intake 73. At the same time, the biogas extracted from the main circulation pipe 71 can also be treated to remove water vapor when passing through the demister box 51 and the diversion tank 54, so as to ensure the purity of the collected biogas.

[0030] To address the technical problem of scum easily hardening and forming a permanent crust that is difficult to break off naturally, thus affecting biogas collection and the safety of the digester, such as... Figure 1 - Figure 9 As shown, the following preferred technical solutions are provided: The circulation mechanism 8 includes a return pipe 81 connected to the gas collection tank 6, and a suction pump 82 is installed on one side of the return pipe 81. The suction pump 82 is equipped with a solenoid valve, and both are controlled by an external controller. When biogas is being collected normally in the gas collection tank 6, the suction pump 82 and the solenoid valve are in a closed state to prevent biogas from entering the return pipe 81 during normal biogas collection.

[0031] The output end of the return pipe 81 is connected to the diversion pipe 83, and one side of the diversion pipe 83 is connected to multiple sets of connecting pipes 84. When the suction pump 82 and its solenoid valve are opened, gas is drawn from the gas collection tank 6. The biogas collected in the gas collection tank 6 with a certain pressure can be introduced into the diversion pipe 83 and the connecting pipes 84 through the return pipe 81. The tail section of the return pipe 81 that enters the biogas digester body 1 is a retractable hose made of corrosion-resistant material, so that the section of the return pipe 81 in the biogas digester body 1 can deform and adapt when the liquid level in the biogas digester body 1 changes. At the same time, the contact part of the return pipe 81 that enters the biogas digester body 1 is sealed with the biogas digester body 1 to prevent the possibility of leakage in the biogas digester body 1.

[0032] A slag-breaking mechanism 9 is provided above the air intake mechanism 7. The slag-breaking mechanism 9 includes an air filling pipe 91 connected to the connecting pipe 84. The output end of each set of connecting pipes 84 is connected to the air filling pipe 91. The end of the air filling pipe 91 away from the connecting pipe 84 is sealed, so that the gas flowing from the connecting pipe 84 can be filled into the air filling pipe 91. A piston disc 92 is slidably arranged on the upper part of the inner wall of the air filling pipe 91, and the piston disc 92 is sealed with the inner wall of the air filling pipe 91, so that the gas filled into the air filling pipe 91 will not leak.

[0033] A rotating seat 93 is installed at the upper center of the piston disc 92, and a lifting rod 94 is installed at the upper center of the rotating seat 93. The lifting rod 94 is rotatably connected to the piston disc 92 through the rotating seat 93. The top of the lifting rod 94 protrudes outside the air filling pipe 91. A slag breaking disc 95 is fixed to the top of the lifting rod 94. Several arc-shaped blades are fixed on the upper surface of the slag breaking disc 95. A support spring 96 is fixed on the upper surface of the piston disc 92, and the piston disc 92 is elastically connected to the air filling pipe 91 through the support spring 96. Multiple sets of piston discs 92 and support springs 96 are provided on each set of air filling pipes 91. After a certain pressure of biogas is collected in the gas collection tank 6, the controller closes the gas outlet valve pipe 60 on the gas collection tank 6, and the suction pump 82 starts to draw gas from the gas collection tank 6, while the suction pump 52 stops working.

[0034] At this time, the biogas collected in the gas collection tank 6 at a certain pressure will be used to fill each set of gas filling pipes 91 through the return pipe 81, the diversion pipe 83 and the connecting pipe 84. The gas pressure filled from the gas collection tank 6 can push the piston disc 92 in all the gas filling pipes 91 to move upward and compress the support spring 96. This causes the piston disc 92 to drive the lifting rod 94 and the slag breaking disc 95 to move upward together. When the slag breaking disc 95 is not pushed, it is at the bottom of the scum layer 40. Therefore, when the gas pressure pushes the piston disc 92 and the slag breaking disc 95 to move upward, it will push the slag breaking disc 95 out of the scum layer 40. This can break the scum layer 40 covering the biogas digester body 1, which is beneficial to breaking the obstruction of the scum layer 40 when the biogas rises and improving the efficiency of biogas collection.

[0035] A spiral groove 97 is provided in the middle of the outer surface of the lifting rod 94, and a ball bearing is provided in the spiral groove 97 to reduce the friction during sliding. The lifting rod 94 is spirally connected to the air filling pipe 91 through the spiral groove 97. When the air pressure pushes the piston disc 92 and the lifting rod 94 upward, under the spiral force between the spiral groove 97 and the air filling pipe 91, and with the cooperation of the rotating seat 93, the lifting rod 94 can rotate as it moves upward. This allows the lifting rod 94 to synchronously drive the slag breaking disc 95 to move upward and rotate at the same time. The slag breaking disc 95, with its fixed arc-shaped blades on the upper surface, can effectively break up the slag layer 40, thereby improving the breaking effect of the slag layer 40 and reducing the resistance of the slag when the slag breaking disc 95 moves upward, thus ensuring the effect of biogas rising and collecting. At the same time, the rotation of the slag breaking disc 95 can also break up the slag layer 40. The slag generates a certain amount of disturbance, which can prevent the slag layer 40 from solidifying and hardening. At the same time, since the slag layer 40 does not completely cover the liquid surface inside the biogas digester body 1 under normal conditions, there is no need to continuously break the slag layer 40. This avoids the problem that continuous breaking of slag would aggravate the disturbance of the liquid surface, leading to an increase in the amount of liquid carried by biogas and a deterioration in the gas-liquid separation effect. Inflating the gas into the aeration pipe 91 is a periodic process, and the breaking action of the slag breaking plate 95 on the slag layer 40 is relatively gentle, which will not cause violent fluctuations in the gas-liquid interface inside the biogas digester body 1. While allowing biogas to effectively pass through the slag layer 40 and flow upward, it can also avoid the problem of generating more foam due to large fluctuations in the liquid surface, and will not affect the fermentation process inside the biogas digester body 1, ensuring the stability of the fermentation liquid and sediment inside the biogas digester body 1.

[0036] A sleeve 98 is fixed above the outer surface of the lifting rod 94, and the bottom end of the sleeve 98 is fixed to the outer surface of the air inlet pipe 91. The sleeve 98 is made of elastic and stretchable material. The sleeve 98 can be used to seal the joint between the lifting rod 94 and the air inlet pipe 91, so as to prevent the fermentation liquid and scum from affecting the movement of the lifting rod 94 and the spiral groove 97. Several support rods 99 are fixed above the outer surface of the air inlet pipe 91, and a float ball 910 is fixed to the top of each set of support rods 99. Several connecting sleeves 30 are fixed below the outer surface of the air inlet pipe 91. Multiple sets of aeration pipes 91 are connected to the branch pipes 72 below using corresponding connecting sleeves 30 on each set. Multiple sets of floats 910 always float on the scum layer 40, so that the branch pipes 72 and aeration pipes 91 are always submerged in the uppermost layer of fermentation liquid in the biogas digester body 1 under the action of the floats 910 and the main flow pipe 71 hose. At the same time, the position of the branch pipes 72 and aeration pipes 91 relative to the liquid surface does not change with the change of liquid level, so that the scum breaking plate 95 on the aeration pipe 91 can always maintain the scum breaking effect on the scum layer 40.

[0037] Each set of inflation pipes 91 is connected to a one-way pressure valve 10 at its bottom, and the bottom of the one-way pressure valve 10 is connected to a branch pipe 72. The opening direction of the one-way pressure valve 10 is towards the branch pipe 72, and the opening pressure of the one-way pressure valve 10 on each set of inflation pipes 91 is greater than the force required to compress the support spring 96 to its maximum extent when all piston discs 92 in the corresponding inflation pipe 91 move upward due to air pressure. Therefore, when the inflation pipe 91 is being inflated, and the piston disc 92 eventually drives the slag-breaking disc 95 to move to its maximum extent and can no longer move, as the air pressure in the inflation pipe 91 continues to rise, the air pressure will eventually push open the one-way pressure valve 10. The excess airflow injected into the air inlet 91 will flow into the branch pipe 72. At this time, since the air pump 52 stops pumping air, the airflow will flow into the branch pipe 72 in one direction. Finally, the airflow will be blown out from the air inlet 73 and the permeable layer 74. This excess air pressure can backflush the permeable layer 74 to reduce the possibility of blockage in the permeable layer 74 and ensure that the air inlet 73 and the permeable layer 74 absorb biogas smoothly. At the same time, the backflush airflow pressure is controlled by the air delivery of the air pump 82. Under the strength of the permeable membrane on the inner side of the permeable layer 74 and the protection of the outer metal filter, the permeable membrane on the inner side of the permeable layer 74 will not be damaged.

[0038] Simultaneously, the suction pump 82 is turned on to fill the aeration pipe 91 with air for a short period of time. While this breaks up the scum layer 40 and backflushes the permeable layer 74, its impact on the overall biogas collection of the device is negligible. After the periodic air filling, the suction pump 82 draws air from the aeration pipe 91 in the reverse direction. At this time, the one-way pressure valve 10 closes, which creates a negative pressure in the aeration pipe 91. The force generated by the negative pressure is greater than the friction force of the lifting rod 94 moving downward using the spiral groove 97. Under the rebound action of the support spring 96 and the negative pressure of the air filling, the piston plate 92 and the scum breaking plate 95 eventually move down to their original positions, ready for the next backflushing movement. At the same time, the backflushing gas is the collected biogas returning to its original state and will not affect the anaerobic environment inside the biogas digester 1.

[0039] 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.

[0040] 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 device for harmless treatment of livestock and poultry breeding waste, comprising a biogas digester body (1) and an inlet (2) connected to one side of the biogas digester body (1), characterized in that: A skylight cover (3) is fixed at the upper middle part of the biogas digester body (1), and ventilation openings (4) are provided on both sides of the bottom surface of the skylight cover (3). A gas collection chamber (20) is opened in the middle of the inner side of the skylight cover (3). A water pressure chamber (50) is connected to the rear of the biogas digester body (1). A guide pipe (70) is connected to the upper side of the skylight cover (3). The output end of the guide pipe (70) is connected to an air extraction mechanism (5), and the output end of the air extraction mechanism (5) is connected to a gas collection tank (6). An air outlet valve pipe (60) is installed on one side of the gas collection tank (6). An air suction mechanism (7) passes through the middle of the skylight cover (3). A scum layer (40) is provided inside the biogas digester body (1).

2. The device for harmless treatment of livestock and poultry breeding waste according to claim 1, characterized in that: The air extraction mechanism (5) includes a demister (51) connected to the guide pipe (70), and an air pump (52) is connected to one side of the demister (51).

3. The livestock and poultry breeding waste harmless treatment device according to claim 2, characterized in that: One side of the air pump (52) is connected to an air guide pipe (53), and the output end of the air guide pipe (53) is connected to a diversion tank (54). The top of the diversion tank (54) is connected to an air guide pipe (55), and the output end of the air guide pipe (55) is connected to the gas collection tank (6).

4. The device for harmless treatment of livestock and poultry breeding waste according to claim 2, characterized in that: The air intake mechanism (7) includes a main flow pipe (71) connected to the demister box (51), and a branch pipe (72) is connected to the bottom of the main flow pipe (71).

5. The livestock and poultry breeding waste harmless treatment device according to claim 4, characterized in that: The bottom surface of the branch pipe (72) is equipped with several air inlets (73), and each group of air inlets (73) has a permeable layer (74) fixed on its surface.

6. The livestock and poultry breeding waste harmless treatment device according to claim 4, characterized in that: The circulation mechanism (8) includes a return pipe (81) connected to the gas collection tank (6), and a suction pump (82) is installed on one side of the return pipe (81).

7. The device for harmless treatment of livestock and poultry breeding waste according to claim 6, characterized in that: The output end of the return pipe (81) is connected to a shunt pipe (83), and one side of the shunt pipe (83) is connected to multiple sets of connecting pipes (84).

8. The livestock and poultry breeding waste harmless treatment device according to claim 7, characterized in that: A slag breaking mechanism (9) is provided above the air intake mechanism (7). The slag breaking mechanism (9) includes an air filling pipe (91) connected to the connecting pipe (84). A piston disc (92) is slidably provided above the inner wall of the air filling pipe (91).

9. The device for harmless treatment of livestock and poultry breeding waste according to claim 8, characterized in that: A rotating seat (93) is installed at the upper center of the piston disc (92), and a lifting rod (94) is installed at the upper center of the rotating seat (93). The lifting rod (94) is rotatably connected to the piston disc (92) through the rotating seat (93). A slag-breaking disc (95) is fixed at the top of the lifting rod (94). A support spring (96) is fixed on the upper surface of the piston disc (92), and the piston disc (92) is elastically connected to the air filling pipe (91) through the support spring (96). A spiral groove (97) is provided at the center of the outer surface of the lifting rod (94), and the lifting rod (94) is spirally connected to the air filling pipe (91) through the spiral groove (97).

10. The livestock and poultry breeding waste harmless treatment device according to claim 9, characterized in that: A cover (98) is fixed above the outer surface of the lifting rod (94), and the bottom end of the cover (98) is fixed to the outer surface of the inflation tube (91). Several support rods (99) are fixed above the outer surface of the inflation tube (91), and a float (910) is fixed at the top of each set of support rods (99). Several connecting sleeves (30) are fixed below the outer surface of the inflation tube (91). A one-way pressure valve (10) is connected to the bottom of each set of inflation tubes (91), and the bottom of the one-way pressure valve (10) is connected to the branch pipe (72).

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