Interface water reconstruction induction kitchen waste anaerobic digestion device

Abstract

The invention relates to an interface water reconstruction induced kitchen waste anaerobic digestion device which comprises an anaerobic reactor, supporting legs are arranged on the periphery of the lower end of the anaerobic reactor, a sealing cover is arranged at the uppermost end of the anaerobic reactor, a drying cylinder is arranged in the center of the interior of the anaerobic reactor, and a first device block is arranged at the lower end of the left side of the anaerobic reactor. A gas collecting pipe is arranged at the center of the upper end of the right side of the anaerobic reactor, a biogas cabinet is arranged on the right side of the gas collecting pipe, a cabinet cover is arranged at the upper end of the biogas cabinet, a gas conveying pipe is arranged at the center of the upper end of the right side of the biogas cabinet, and a second device block is arranged at the lower end of the right side of the biogas cabinet; the device has the advantages that the fermentation efficiency and the gas production rate are improved, the process is simple, feasible and effective, and the device is simple in structure and stable in operation.

Description

Technical Field

[0001] The invention relates to the technical field of anaerobic digestion of garbage, and in particular to an anaerobic digestion device for inducing anaerobic digestion of kitchen garbage by interfacial water reconstruction. Background Art

[0002] Anaerobic digestion technology is a technology that decomposes organic matter in food waste into gases such as methane and carbon dioxide through the metabolism of microorganisms under anaerobic or low-oxygen conditions. This technology has the dual advantages of volume reduction and resource utilization. The biogas produced during anaerobic digestion can be used as energy, such as power generation or heating, thus realizing the resource utilization of waste. At the same time, anaerobic digestion can also reduce the volume and quality of garbage and alleviate the pressure of subsequent treatment.

[0003] Patent application number CN202223178774.2 is a Chinese invention patent, which discloses an organic waste anaerobic digestion reactor, including a reaction tank, which also includes: a stirrer for generating a horizontal vortex, the stirrer is arranged in the reaction tank, and the stirring shaft of the stirrer is arranged along the central axis of the reaction tank; a guide tube for transporting the biogas at the top of the reaction tank to the bottom of the reaction tank, the guide tube is arranged outside the reaction tank, and the upper and lower ends of the guide tube are respectively connected to the reaction tank; a flow pusher for providing power to the flow of the fluid in the guide tube, the flow pusher is arranged in the guide tube; a slurry inlet for providing raw materials for the reaction to the reaction tank, and the slurry inlet is connected to the reaction tank. The present invention provides an organic waste anaerobic digestion reactor with a simple structure and a large volume load, but the device has the following problems: first, the device cannot treat the interface water generated by food residues and grease in the kitchen waste during storage and transportation, and secondly, the device cannot purify the biogas generated during the anaerobic digestion process. Summary of the invention

[0004] The purpose of the present invention is to address the deficiencies of the prior art. The electric heating coil of the drying drum inside the anaerobic reactor is used to generate heat to generate high temperature inside the anaerobic reactor, and the interface water of the food waste is solid-state evaporated to solve the technical problem that the device cannot treat the interface water generated during the storage and transportation of food residues and grease in the food waste. The activated carbon plates movably connected around the inner wall of the biogas cabinet are arranged to absorb impurities in the biogas to solve the technical problem that the device cannot purify the biogas generated during the anaerobic digestion process.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An interfacial water reconstruction-induced anaerobic digestion device for kitchen waste comprises an anaerobic reactor, wherein supporting feet are arranged around the lower end of the anaerobic reactor, a sealing cover is arranged at the uppermost end of the anaerobic reactor, a drying cylinder is arranged at the center inside the anaerobic reactor, a No. 1 device block is arranged at the lower left end of the anaerobic reactor, a No. 1 vacuum pump is arranged at the upper end of the No. 1 device block, a gas collecting pipe is arranged at the center of the upper right end of the anaerobic reactor, a biogas cabinet is arranged on the right side of the gas collecting pipe, a cabinet cover is arranged at the upper end of the biogas cabinet, a gas conveying pipe is arranged at the center of the upper right end of the biogas cabinet, a No. 2 device block is arranged at the lower right end of the biogas cabinet, and a No. 2 vacuum pump is arranged at the upper end of the No. 2 device block.

[0007] As a preferred embodiment, a material delivery port is provided on the left side of the upper end of the sealing cover, an anaerobic bacteria delivery port is provided on the front side of the upper end of the sealing cover, and a stirring motor is provided at the center of the upper end of the sealing cover.

[0008] As a preference, a transmission rod is provided at the center of the lower end of the stirring motor, stirring wings are evenly provided on the outer side of the transmission rod, and the transmission rod and the stirring wings are both located inside the drying cylinder.

[0009] As a preferred embodiment, an electric heating coil is provided inside the drying drum, a carbon fiber electric heating element is provided inside the electric heating coil, and a discharge hopper is provided at the lower end of the drying drum, an electric sealing valve is provided at the lower end of the lower hopper, and a discharge pipe port is provided at the lower end of the electric sealing valve.

[0010] As a preferred embodiment, a pipe is provided at the center of the right side of the No. 1 vacuum pump, and the pipe of the No. 1 vacuum pump is connected to the inside of the anaerobic reactor. A pipe is provided at the center of the left end of the No. 2 vacuum pump, and the pipe of the No. 2 vacuum pump is connected to the inside of the biogas tank.

[0011] As a preferred embodiment, the inner wall of the biogas tank is movably connected with activated carbon plates around it.

[0012] As a preference, a coarse filter layer is provided on the inner side of the activated carbon plate, and the coarse filter layer is a 3 mm thick honeycomb activated carbon plate. A fine filter layer is provided on the outer side of the coarse filter layer, and the fine filter layer is a 1.5 mm thick columnar activated carbon.

[0013] As a preference, a two-way valve is provided at the center of the right side of the gas delivery pipe, a delivery pipe is provided at the center of the right side of the two-way valve, a return pipe is provided at the center behind the two-way valve, and the left side of the return pipe is connected to the drying cylinder.

[0014] As a preferred embodiment, a spiral heat exchange tube is provided on the outside of the drying cylinder, and the spiral heat exchange tube is located between the drying cylinder and the anaerobic reactor. A threaded groove is provided on the inner wall of the spiral heat exchange tube. A biogas inlet and outlet is provided on the upper end of the rear side of the spiral heat exchange tube. The biogas inlet and outlet extend to the anaerobic reactor and are flange-connected to the gas delivery pipe.

[0015] Beneficial effects of the present invention:

[0016] (1) In the present invention, an electric heating coil is arranged inside the drying drum of the anaerobic reactor to generate heat so as to generate high temperature inside the anaerobic reactor. During the storage and transportation of food waste, food residues and grease generate interfacial water during the storage and transportation. The interfacial water has multiple hazards and releases a large amount of volatile organic compounds and harmful gases such as ammonia. After the food waste is put into the anaerobic reactor, the electric heating coil inside the drying drum is heated by the carbon fiber electric heating element to generate high temperature inside the anaerobic reactor and perform solid-state evaporation treatment on the interfacial water. After the interfacial water evaporates in the solid state, the remaining solid food waste is subjected to subsequent anaerobic fermentation and digestion steps. By solid-state evaporation of the interfacial water, the electric heating coil mainly heats up quickly, and the spiral heat exchange tube assists in heating to reduce the energy consumption of the electric heating coil. The spiral heat exchange tube and the electric heating coil form an inner and outer double-layer heat source, which can adjust the humidity of the food waste to make it more in line with the optimal conditions for anaerobic fermentation, thereby improving the fermentation efficiency and gas production.

[0017] (2) In the present invention, the negative pressure inside the anaerobic reactor and the biogas tank is adjusted by connecting the pipeline of the No. 1 vacuum pump to the inside of the anaerobic reactor and the pipeline of the No. 2 vacuum pump to the inside of the biogas tank. The negative pressure can ensure the stability of the anaerobic reaction environment in the anaerobic reactor and prevent the entry of oxygen, thereby ensuring the growth and reproduction of anaerobic microorganisms. At the same time, the negative pressure can also prevent the leakage of biogas and ensure the safety of the site. The pressure inside the anaerobic reactor and the biogas tank will form a negative pressure through the drive of the vacuum pump, and the two separate sets of vacuum pumps can control the pressure inside the anaerobic reactor to be higher than the pressure inside the biogas tank, so as to form a pressure difference. The biogas flows into the biogas tank through the gas collection pipe due to the pressure difference. The process is simple, easy and effective.

[0018] (3) In the present invention, activated carbon plates movably connected around the inner wall of the biogas cabinet are arranged to purify the collected biogas. The activated carbon plates have rich microporous structures, which enable them to adsorb methane and carbon dioxide in the biogas. Impurities in the biogas are separated, thereby improving the purity of the biogas. The purified biogas is then transported through a gas delivery pipe. Most of the purified biogas is transported to a gas collection station connected to the delivery pipe for unified management. A small part of the biogas flows back to the spiral heat exchange tube on the outer wall of the drying drum through a reflux pipe. The heat temperature of the biogas itself is used to transfer heat to the solid food waste inside the drying drum through heat conduction. At the same time, the threaded grooves inside the spiral heat exchange tube can increase the turbulent effect of biogas transmission and improve the heat transfer coefficient. The biogas adsorbed by the activated carbon plate can reduce the subsequent processing cost. The device has a simple structure and stable operation.

[0019] In summary, the device has the advantages of improving fermentation efficiency and gas production, simple and effective process, simple device structure and stable operation, and is particularly suitable for the field of anaerobic digestion technology of garbage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 It is a schematic diagram of the structure of the anaerobic reactor and the sealing cover in the present invention.

[0023] Figure 3 It is a schematic diagram of the drying cylinder structure in the present invention.

[0024] Figure 4 It is a schematic diagram of the position structure of the spiral heat exchange tube in the present invention.

[0025] Figure 5 It is a schematic diagram of the structure of the biogas cabinet in the present invention.

[0026] Figure 6 It is a schematic diagram of the structure of the activated carbon plate in the present invention. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings.

[0028] Embodiment 1

[0029] like Figures 1 to 6 As shown, the present invention provides an interfacial water reconstruction-induced anaerobic digestion device for food waste, comprising an anaerobic reactor 1, wherein supporting feet 11 are arranged around the lower end of the anaerobic reactor 1, a sealing cover 2 is arranged at the uppermost end of the anaerobic reactor 1 to form a sealed state inside the anaerobic reactor 1, a drying cylinder 12 is arranged at the center inside the anaerobic reactor 1, a No. 1 device block 3 is arranged at the lower end of the left side of the anaerobic reactor 1, a No. 1 vacuum pump 31 is arranged at the upper end of the No. 1 device block 3, a gas collection pipe 4 is arranged at the center of the upper right end of the anaerobic reactor 1, a biogas cabinet 5 is arranged on the right side of the gas collection pipe 4, a cabinet cover 51 is arranged at the upper end of the biogas cabinet 5, a gas delivery pipe 6 is arranged at the center of the upper right end of the biogas cabinet 5, a No. 2 device block 7 is arranged at the lower end of the right side of the biogas cabinet 5, and a No. 2 vacuum pump 71 is arranged at the upper end of the No. 2 device block 7.

[0030] Furthermore, a material delivery port 21 is provided on the left side of the upper end of the sealing cover 2, through which the food waste can be delivered into the anaerobic reactor 1, and at the same time, the upper end of the material delivery port 21 is hingedly connected to the sealing cover, and when the food waste is delivered, the sealing cover is closed to seal the interior, and an anaerobic bacteria delivery port 22 is provided on the front side of the upper end of the sealing cover 2, through which the anaerobic bacteria can be delivered into the anaerobic reactor 1, and at the same time, the upper end of the anaerobic bacteria delivery port 22 is hingedly connected to the sealing cover, and when the anaerobic bacteria are delivered, the sealing cover is closed to seal the interior, and a stirring motor 23 is provided at the center of the upper end of the sealing cover 2.

[0031] Furthermore, a transmission rod 231 is provided at the center of the lower end of the stirring motor 23, and stirring wings 232 are evenly provided on the outer side of the transmission rod 231. The transmission rod 231 and the stirring wings 232 are both located inside the drying cylinder 12. When anaerobic fermentation treatment is performed, the stirring motor 23 drives the transmission rod 231, and the transmission rod 231 rotates to drive the stirring wings 232 to stir the food waste inside the anaerobic reactor 1, so that the anaerobic fermentation is more thorough, thereby accelerating the anaerobic digestion process.

[0032] Furthermore, an electric heating coil 121 is provided inside the drying drum 12, and a carbon fiber electric heating element is provided inside the electric heating coil 121. The electric heating coil 121 inside the drying drum 12 is heated by the carbon fiber electric heating element to generate high temperature in the anaerobic reactor 1, and the interface water is evaporated in solid state. After the interface water is evaporated in solid state, the remaining solid food waste is subjected to subsequent anaerobic fermentation and digestion process. A discharge hopper 122 is provided at the lower end of the drying drum 12. After the anaerobic fermentation and digestion of the food waste is completed, the food waste is discharged through the discharge hopper 122. An electric sealing valve 123 is provided at the lower end of the discharge hopper 122. The electric sealing valve 123 is respectively provided with an electric actuator and a valve. The electric actuator is the power source of the valve. By controlling the switch thereof to control the opening and closing of the valve, the airtightness inside the device can be effectively ensured. A discharge pipe port 124 is provided at the lower end of the electric sealing valve 123. When discharge is required, a signal is transmitted to the electric actuator to open the valve so that the food waste can be discharged through the discharge port 124.

[0033] Furthermore, a pipeline is provided at the center of the right side of the No. 1 vacuum pump 31, and the pipeline of the No. 1 vacuum pump 31 is connected to the inside of the anaerobic reactor 1. A pipeline is provided at the center of the left end of the No. 2 vacuum pump 71, and the pipeline of the No. 2 vacuum pump 71 is connected to the inside of the biogas tank 5. The two separate groups of vacuum pumps can control the pressure inside the anaerobic reactor 1 to be higher than the pressure inside the biogas tank 5, so as to form a pressure difference. The biogas flows into the biogas tank 5 through the gas collection pipe 4 due to the pressure difference. The process is simple, easy and effective.

[0034] Furthermore, the activated carbon plate 52 is movably connected to the inner wall of the biogas cabinet 5. The activated carbon plate 52 has a rich microporous structure, which enables it to adsorb methane and carbon dioxide in the biogas, and the impurities in the biogas are separated, thereby improving the purity of the biogas. At the same time, when the activated carbon plate 52 needs to be replaced, it is only necessary to open the cabinet cover 51, slide out the old activated carbon plate 52, and then replace it with a new activated carbon plate 52.

[0035] Furthermore, a coarse filter layer 521 is provided on the inner side of the activated carbon plate 52. The coarse filter layer 521 is a 3 mm thick honeycomb activated carbon plate for intercepting large particles of impurities. A fine filter layer 523 is provided on the outer side of the coarse filter layer 521. The fine filter layer 523 is a 1.5 mm thick columnar activated carbon for improving the purity of the biogas.

[0036] Furthermore, a two-way valve 61 is provided at the center of the right side of the gas delivery pipe 6. The two-way valve 61 is respectively provided with a valve body and a driver, and the opening and closing of the valve are controlled by the driver. A delivery pipe 62 is provided at the center of the right side of the two-way valve 61, and the delivery pipe is connected to an external gas collection station. Most of the purified biogas is transported to the gas collection station connected to the delivery pipe 62 for unified management. A return pipe 63 is provided at the center of the rear side of the two-way valve 61. The left side of the return pipe 63 is connected to the drying drum 12. A small part of the biogas flows back to the spiral heat exchange tube 13 on the outer wall of the drying drum 12 through the return pipe 63, and the heat is transferred to the solid food waste inside the drying drum 2 through heat conduction using the temperature of the biogas itself. At the same time, the threaded groove inside the spiral heat exchange tube 13 can increase the turbulence effect of biogas transmission and improve the heat transfer coefficient.

[0037] Furthermore, a spiral heat exchange tube 13 is provided on the outside of the drying cylinder 12, and the spiral heat exchange tube 13 is located between the drying cylinder 12 and the anaerobic reactor 1. The inner wall of the spiral heat exchange tube 13 is provided with a threaded groove, which can increase the turbulence effect of biogas transmission and improve the heat transfer coefficient. A biogas inlet and outlet 131 is provided at the upper end of the rear side of the spiral heat exchange tube 13, and the biogas inlet and outlet 131 extends to the anaerobic reactor 1 and is flange-connected to the gas delivery pipe 6.

[0038] Working process: first, the food waste is put into the anaerobic reactor 1 through the material feeding port 21, and then the electric heating coil 121 inside the drying drum 12 is heated by the carbon fiber electric heating element to generate high temperature in the anaerobic reactor 1, and the interface water on the food waste is evaporated in the solid state. After the interface water evaporates in the solid state, anaerobic bacteria are then put into the anaerobic reactor 1 through the anaerobic bacteria feeding port 22. Under the action of anaerobic bacteria, the remaining solid food waste is decomposed to produce biogas and other products. When anaerobic fermentation is carried out, the stirring motor 23 drives the transmission rod 231, and the transmission rod 231 rotates to drive the stirring wings 232 to stir the food waste inside the anaerobic reactor 1, so that the anaerobic fermentation is more thorough, thereby accelerating the anaerobic digestion process.

[0039] Secondly, the two separate vacuum pumps can control the pressure inside the anaerobic reactor 1 to be higher than the pressure inside the biogas cabinet 5, so that a pressure difference is formed. The biogas flows into the biogas cabinet 5 through the gas collection pipe 4 due to the pressure difference. The activated carbon plate 52 movably connected around the inner wall of the biogas cabinet 5 purifies the collected biogas. The activated carbon plate 52 has a rich microporous structure, which enables it to adsorb methane and carbon dioxide in the biogas, and the impurities in the biogas are separated, thereby improving the purity of the biogas. The purified biogas is then transported through the gas delivery pipe 6, and most of the purified biogas is transported to the delivery pipe 62 connected to the The gas collection station is managed uniformly, and a small part of the biogas flows back to the spiral heat exchange tube 13 on the outer wall of the drying cylinder 12 through the return pipe 63. The heat of the biogas itself is transferred to the solid food waste inside the drying cylinder 12 through heat conduction. At the same time, the threaded groove inside the spiral heat exchange tube 13 can increase the turbulence effect of biogas transmission and improve the heat transfer coefficient. The electric heating coil 121 mainly heats up quickly, and the spiral heat exchange tube 13 assists in heating to reduce the energy consumption of the electric heating coil 121. The spiral heat exchange tube 3 and the electric heating coil 121 form an inner and outer double-layer heat source, which makes it more in line with the optimal conditions for anaerobic fermentation, thereby improving the fermentation efficiency and gas production.

[0040] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "front and back", "left and right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the invention.

[0041] Of course, in the present technical solution, those skilled in the art should understand that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0042] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art under the technical guidance of the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An interfacial water reconstruction-induced anaerobic digestion device for food waste, characterized in that: The invention comprises an anaerobic reactor (1), wherein the lower end of the anaerobic reactor (1) is provided with supporting feet (11) around the periphery, the upper end of the anaerobic reactor (1) is provided with a sealing cover (2), the inner center of the anaerobic reactor (1) is provided with a drying cylinder (12), the lower left end of the anaerobic reactor (1) is provided with a No. 1 device block (3), the upper end of the No. 1 device block (3) is provided with a No. 1 vacuum pump (31), the upper right end of the anaerobic reactor (1) is provided with a gas collection pipe (4), the right side of the gas collection pipe (4) is provided with a biogas cabinet (5), the upper end of the biogas cabinet (5) is provided with a cabinet cover (51), the upper right end of the biogas cabinet (5) is provided with a gas delivery pipe (6), the lower right end of the biogas cabinet (5) is provided with a No. 2 device block (7), the upper end of the No. 2 device block (7) is provided with a No. 2 vacuum pump (71).

2. The device for anaerobic digestion of kitchen waste by inducing interfacial water reconstruction according to claim 1, characterized in that: A material delivery port (21) is provided on the left side of the upper end of the sealing cover (2), an anaerobic bacteria delivery port (22) is provided on the front side of the upper end of the sealing cover (2), and a stirring motor (23) is provided at the center of the upper end of the sealing cover (2).

3. The device for anaerobic digestion of food waste by inducing interfacial water reconstruction according to claim 2, characterized in that: A transmission rod (231) is provided at the center of the lower end of the stirring motor (23), stirring wings (232) are evenly arranged on the outer side of the transmission rod (231), and the transmission rod (231) and the stirring wings (232) are both located inside the drying cylinder (12).

4. The device for anaerobic digestion of kitchen waste by inducing interfacial water reconstruction according to claim 1, characterized in that: An electric heating coil (121) is provided inside the drying cylinder (12), a carbon fiber electric heating element is provided inside the electric heating coil (121), a material discharge hopper (122) is provided at the lower end of the drying cylinder (12), an electric sealing valve (123) is provided at the lower end of the material discharge hopper (122), and a material discharge pipe opening (124) is provided at the lower end of the electric sealing valve (123).

5. The device for anaerobic digestion of kitchen waste by inducing interfacial water reconstruction according to claim 1, characterized in that: A pipeline is provided at the center of the right side of the No. 1 vacuum pump (31), and the pipeline of the No. 1 vacuum pump (31) is connected to the inside of the anaerobic reactor (1). A pipeline is provided at the center of the left end of the No. 2 vacuum pump (71), and the pipeline of the No. 2 vacuum pump (71) is connected to the inside of the biogas tank (5).

6. The device for anaerobic digestion of kitchen waste by inducing interfacial water reconstruction according to claim 1, characterized in that: The inner wall of the biogas cabinet (5) is movably connected to an activated carbon plate (52) around its periphery.

7. The device for anaerobic digestion of food waste by inducing interfacial water reconstruction according to claim 6, characterized in that: A coarse filter layer (521) is provided on the inner side of the activated carbon plate (52), and the coarse filter layer (521) is a 3 mm thick honeycomb activated carbon plate. A fine filter layer (523) is provided on the outer side of the coarse filter layer (521), and the fine filter layer (523) is a 1.5 mm thick columnar activated carbon.

8. The device for anaerobic digestion of food waste by inducing interfacial water reconstruction according to claim 1, characterized in that: A two-way valve (61) is provided at the center of the right side of the gas delivery pipe (6), a delivery pipe (62) is provided at the center of the right side of the two-way valve (61), a return pipe (63) is provided at the center of the rear side of the two-way valve (61), and the left side of the return pipe (63) is connected to the drying cylinder (12).

9. The device for anaerobic digestion of food waste by inducing interfacial water reconstruction according to claim 1, characterized in that: A spiral heat exchange tube (13) is provided on the outside of the drying cylinder (12), the spiral heat exchange tube (13) is located between the drying cylinder (12) and the anaerobic reactor (1), a threaded groove is provided on the inner wall of the spiral heat exchange tube (13), a biogas inlet and outlet (131) is provided on the upper rear end of the spiral heat exchange tube (13), the biogas inlet and outlet (131) extends to the anaerobic reactor (1) and is flange-connected to the gas delivery pipe (6).

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