CN106857099B

CN106857099B - Take biogas heating auxiliary system's agricultural greenhouse

Info

Publication number: CN106857099B
Application number: CN201710168741.4A
Authority: CN
Inventors: 李梦颖
Original assignee: Individual
Current assignee: Zhejiang Rongda Ecological Agriculture Development Co ltd
Priority date: 2017-03-21
Filing date: 2017-03-21
Publication date: 2022-05-24
Anticipated expiration: 2037-03-21
Also published as: CN106857099A

Abstract

The invention provides an agricultural greenhouse with a biogas heating auxiliary system, which solves the technical problems of low indoor temperature, poor heat preservation and the like of the existing agricultural greenhouse in a cold environment. The agricultural greenhouse with the methane heating auxiliary system comprises a greenhouse frame and a transparent greenhouse film, the methane heating auxiliary system comprises a methane fermentation tank, a transparent flow guide pipe is laid on the top surface of the greenhouse film, a geothermal pipe is laid on the ground in the greenhouse and connected with a methane heating device, methane generated by the methane fermentation tank is connected with the methane heating device through a gas pipe, the liquid inlet end of the flow guide pipe is connected with a water storage tank, the water storage tank is further connected with the output port of a first circulating pump, the input port of the first circulating pump is connected with the liquid outlet end of the flow guide pipe through a connecting pipe, and a heat collection sheet is arranged in the water storage tank. The invention has the advantages of energy saving, good greenhouse heat preservation effect and the like.

Description

Take biogas heating auxiliary system's agricultural greenhouse

Technical Field

The invention belongs to the technical field of greenhouse planting, relates to an agricultural greenhouse, and particularly relates to an agricultural greenhouse with a methane heating auxiliary system.

Background

With the continuous development of agricultural industry structures, greenhouse crops develop rapidly, the crops in the greenhouse have certain requirements on the temperature of the greenhouse, in cold areas such as the north, greenhouse planting is often affected by extremely cold weather, and the temperature in the greenhouse is too low, so that the normal production of the crops is affected. In order to solve this problem, the temperature in the greenhouse is raised, usually by providing heating wires in the greenhouse and heating the greenhouse by electric heating, but the energy saving performance is poor. The greenhouse is usually covered on a greenhouse frame by a layer of transparent plastic film, the temperature difference between the interior of the greenhouse and the outside is large, the heat in the greenhouse is easy to dissipate, and the heat preservation performance is poor.

Disclosure of Invention

The invention aims to solve the problems in the prior art, provides an agricultural greenhouse with a methane heating auxiliary system, and solves the problems of low indoor temperature, poor heat preservation performance and the like of the agricultural greenhouse in a cold environment.

The purpose of the invention can be realized by the following technical scheme: an agricultural greenhouse with a biogas heating auxiliary system, the greenhouse comprises a greenhouse frame and a transparent greenhouse film, the greenhouse frame is supported on the ground, the greenhouse film covers the greenhouse frame, the biogas heating auxiliary system comprises a biogas fermentation tank, the biogas fermentation tank is arranged in a pit, the pit is dug from the ground, and a pit cover is covered at the top of the pit, the agricultural greenhouse is characterized in that the biogas fermentation tank comprises a tank body and a tank cover, the tank body is provided with a tank cavity, the tank cover is fixed at the top end of the tank body in a sealing manner, the bottom of the tank body is supported at the bottom of the pit through a stand column, the biogas heating auxiliary system comprises an internal heating auxiliary system and an external heating auxiliary system, the internal heating auxiliary system comprises a radiator which is arranged at the center of the inner bottom of the tank body and is used for heating biogas slurry in the tank body, and the radiator comprises a first radiating fin, the first radiating fins are fixed on the bottom surface of the tank body through a frame, a diffusion device used for conveying biogas slurry heated by the radiator to the top and the periphery of the tank body is arranged above the radiator, the internal heating auxiliary system further comprises a biogas slurry heating device arranged above the pit cover, the biogas slurry heating device is communicated with the inner bottom of the tank body of the biogas fermentation tank through a pipeline, the biogas slurry heating device is connected with a liquid pumping device capable of pumping biogas slurry in the tank body into the biogas slurry heating device and discharging biogas slurry in the biogas slurry heating device into the tank body, the external heating auxiliary system comprises a vegetation planting base arranged at the bottom of the pit, and vegetation is planted on the vegetation planting base; the top surface of the greenhouse film is paved with a transparent flow guide pipe, the flow guide pipe is provided with a liquid inlet end and a liquid outlet end, the flow guide pipe is distributed on the top surface of the greenhouse film in a folding manner and is abutted against the top surface of the greenhouse film, the ground in the greenhouse is paved with a geothermal pipe, the geothermal pipe is provided with an input end and an output end, the geothermal pipe is distributed on the ground in the greenhouse in a folding manner, the geothermal pipe is connected with a methane heating device capable of providing hot water circulation in the geothermal pipe, the methane generated by a methane fermentation tank is connected with the methane heating device through a gas pipe, the liquid inlet end of the flow guide pipe is connected with a water storage tank through a connecting pipe, the water storage tank is also connected with an output port of a first circulating pump through a connecting pipe, the first circulating pump is connected with the liquid outlet end of the flow guide pipe through a connecting pipe, and a heat collecting sheet is arranged in the water storage tank, the heat collecting sheet is connected with the first radiating sheet of the radiator through a heat pipe.

The working principle is as follows: the water storage tank is internally stored with water, the guide pipe, the water storage tank and the circulating pump form a water circulation loop, the circulating pump enables the water in the water circulation loop to circularly flow, the guide pipe is distributed on the top surface of the greenhouse film in a folding mode and is abutted against the top surface of the greenhouse film, when heat of hot air in the greenhouse is dissipated to the outside, the heat is absorbed by the water in the guide pipe, sunlight can irradiate and heat the water in the guide pipe in daytime, the guide pipe is transparent and does not influence the sunlight to irradiate the greenhouse, when the hot water in the water circulation loop flows through the water storage tank, the hot water in the water storage tank conducts the heat to the heat collection sheet, when the temperature in the water storage tank is higher than the temperature of biogas slurry in the tank body, for example, when the sunlight is strong in daytime, the heat collection sheet transmits the heat to a first radiating fin of the radiator through the heat guide pipe, and the biogas slurry in the tank is heated through the first radiating fin. Because the honeycomb duct is in the distribution of folding type and covers the top surface of canopy membrane and leans on with the top surface of canopy membrane, the hot water in the honeycomb duct separation greenhouse's canopy membrane and the direct contact of outside cold air play the heat retaining effect to the greenhouse, reduce the loss of heat in the greenhouse to the outside air, although the hot water heat in the honeycomb duct also can have the condition of losing, compare in the direct exposure of the canopy membrane of ordinary greenhouse in the outside air, its heat loses less relatively. Interior heating auxiliary system heats the natural pond liquid in the methane fermentation pond, the cell body of outer heating auxiliary system to methane fermentation pond keeps warm, the radiator sets up the inner bottom center at the cell body, the natural pond liquid of bottom heats in the cell body, utilize the principle of convection current, the natural pond liquid that the temperature of a part after heating rises, the lower natural pond liquid of temperature on upper portion descends in the cell body, the endless circulation heating, but utilize cold and hot natural pond liquid convection current, its speed is slower, the even ascending speed of natural pond liquid temperature is slow in the cell body, in order to improve the even intensification's of natural pond liquid speed in the cell body, utilize the natural pond liquid that diffuser will pass through after the radiator heating to carry to cell body top and all around, make the natural pond liquid after the heating distribute fast to each region in the cell body. Pit lid top is provided with natural pond liquid heating device, takes out the natural pond liquid in the pond body to natural pond liquid heating device in through drawing liquid device, utilizes natural pond liquid heating device to heat its inside natural pond liquid, then inside the natural pond liquid discharge to the pond body of recycling in drawing liquid device with natural pond liquid heating device, improves the temperature of natural pond liquid in the pond body. Vegetation is planted at the bottom of the pit, and the heat preservation effect of the pond body is realized by utilizing the greenhouse effect generated by the growth of the vegetation, so that the heat loss of the pond body is reduced, and the heat preservation effect of the biogas slurry in the pond body is improved.

The biogas heating device comprises a water storage tank, wherein the output end of the geothermal pipe is communicated with the water storage tank through a connecting pipe, the water storage tank is also connected with the liquid inlet end of a biogas water heater through a connecting pipe, the liquid outlet end of the biogas water heater is connected with the liquid inlet end of a circulating pump II through a connecting pipe, the liquid outlet end of the circulating pump II is connected with the input end of the geothermal pipe through a connecting pipe, the biogas water heater is provided with a gas input nozzle, and biogas generated by a biogas fermentation tank is connected with the gas input nozzle through a gas pipe. The water storage tank is internally stored with water, the geothermal pipe, the water storage tank, the methane water heater and the circulating pump form a water circulation loop, the circulating pump continuously circulates and flows the water in the water circulation loop, the methane water heater heats the water flowing through the methane water heater and conveys the water into the water circulation loop, and the hot water in the geothermal pipe dissipates heat into the greenhouse to increase the temperature in the greenhouse. The methane generated by the methane tank provides fuel for the methane water heater.

The diffusion device comprises a guide cover which is arranged above the radiator and is in an inverted funnel shape, the guide cover is provided with a conical inner cavity, the top end of the guide cover is a closed end, the bottom end of the guide cover is an open end communicated with the inner cavity, the outer wall of the bottom end of the guide cover is fixed with the side wall of the pool body through a connecting rod, a spiral impeller is vertically arranged in the guide cover and comprises a spiral blade and a rotating shaft, the rotating shaft penetrates through and is fixed at the center of the rotating blade, the diameter of the bottom to the top of the spiral blade is gradually reduced, the extension from the bottom to the top of the spiral blade can be abutted against the conical inner cavity wall of the guide cover, a through hole is formed in the center of the top end of the guide cover, the top end of the rotating shaft is rotatably arranged in the through hole in the top end of the guide cover, and the bottom end of the rotating shaft downwards penetrates out of the bottom of the pool body of the biogas fermentation pool, the spiral blade is connected with a driving mechanism, the extension from the bottom to the top of the spiral blade is all abutted to the inner cavity wall of the conical guide cover, a plurality of diffusion holes communicated with the inner cavity of the guide cover are formed in the outer side wall of the guide cover, the diffusion holes are uniformly distributed along the circumferential direction and the axial direction of the guide cover, and a plurality of diffusion pipes communicated with the diffusion holes are fixed on the outer side wall of the guide cover. The driving mechanism enables the spiral impeller to rotate, the inner cavity of the flow guide cover is conical, the diameter of the bottom of the spiral blade to the top of the spiral blade is gradually reduced, the extension from the bottom of the spiral blade to the top of the spiral blade is abutted to the wall of the inner cavity of the flow guide cover, the spiral blade rotates to enable the biogas slurry to be lifted upwards in the flow guide cover, the influence of the volume of the inner cavity of the flow guide cover from the bottom to the top is gradually reduced, the biogas slurry in the flow guide cover is discharged from the diffusion pipe under the action of pressure, the flow guide cover is arranged above the radiator, the biogas slurry heated by the radiator enters from the bottom of the flow guide cover and is discharged from the diffusion pipe, the biogas slurry in the pool body continuously flows in a circulating mode, the temperature difference of the biogas slurry in different areas in the pool body is reduced, and the biogas fermentation effect is improved.

The biogas slurry heating device comprises a second solar heat collecting pipe which is obliquely arranged, the bottom end of the second solar heat collecting pipe is connected with a transverse pipe I, the inner cavity of the second solar heat collecting pipe is communicated with the inner cavity of the transverse pipe I, one end of the transverse pipe I is a closed end, the other end of the transverse pipe I is an open end, the open end is connected with a bent pipe, the other end of the bent pipe extends into a tank cover of the biogas fermentation tank and is communicated with the inner cavity of the tank body, a first electromagnetic valve is arranged in the bent pipe, the middle part of the transverse pipe I is connected with a liquid conveying pipe through a pipe joint, the other end of the liquid conveying pipe extends into the tank body bottom of the biogas fermentation tank and is communicated with the inner cavity of the tank body, a second electromagnetic valve is arranged in the liquid conveying pipe, the top end of the second solar heat collecting pipe is connected with a transverse pipe II, the inner cavity of the second solar heat collecting pipe is communicated with the inner cavity of the transverse pipe II, one end of the transverse pipe II is a closed end, and the other end of the transverse pipe is an open end, the opening end is connected with the liquid pumping device through a connecting pipe, and the first electromagnetic valve and the second electromagnetic valve are connected with a first controller through lines. First controller control solenoid valve is closed, and control solenoid valve two is opened, utilizes the pumping device with the internal natural pond liquid of pond in the transfer line takes out to second solar energy collection pipe, under the illumination of sunshine, second solar energy collection pipe heats its inside natural pond liquid, then first controller control solenoid valve is opened, utilizes the pumping device with the natural pond liquid discharge to the pond body in the second solar energy collection pipe, through second solar energy collection pipe to natural pond liquid direct heating, has the fast advantage of intensification.

Foretell draw liquid device includes the pneumatic cylinder, the pneumatic cylinder includes hydraulic cylinder body, hydraulic piston and hydraulic piston rod, hydraulic cylinder body has business turn over liquid mouth, business turn over liquid mouth pass through the connecting pipe with violently manage the open end intercommunication of two, the hydraulic piston rod of pneumatic cylinder is connected with a telescopic cylinder's piston rod, violently be provided with the electron thermometer in the two, electron thermometer and telescopic cylinder all through the circuit with first controller connect. First controller control telescopic cylinder's piston rod shrink, make hydraulic piston remove in hydraulic cylinder body, the internal negative pressure state that produces of pneumatic cylinder, make the natural pond liquid in the cell body enter into second solar energy collection pipe along the transfer line in, second solar energy collection pipe heats the back to its inside natural pond liquid, violently manage the electronic thermometer sensing that sets up in the two when reaching biogas slurry certain temperature, first controller control telescopic cylinder's piston rod stretches out, produce the high-pressure state in the pneumatic cylinder, and simultaneously, first controller control solenoid valve is opened, control solenoid valve is closed, with second solar energy collection pipe, violently manage the natural pond liquid in the two and discharge to the cell body in through the return bend.

The vegetation planting base comprises a honeycomb plate horizontally arranged below the biogas fermentation tank, the honeycomb plate is supported on the bottom surface of the pit through a stand column, honeycomb holes penetrating through the top surface and the bottom surface of the honeycomb plate are densely distributed on the honeycomb plate, a gravel layer is paved on the honeycomb plate, a mud layer is paved on the gravel layer, the vegetation is planted in the mud layer, and a water storage area is formed between the mud layer and the bottom surface of the tank body. Plant the vegetation in dirt layer, the honeycomb panel plays the effect that bears the weight of the gravel layer on the one hand, on the other hand honeycomb panel has the honeycomb holes who runs through honeycomb panel top surface and bottom surface, form the water storage area between dirt layer and the cell body bottom surface, the water level is higher than the honeycomb panel and immerses the gravel layer, the root system of plant enters into the gravel layer from dirt layer growth and absorbs moisture, the gravel layer plays and supports dirt layer, prevent that earth in the dirt layer from running off the bottom in water storage area from honeycomb holes, and simultaneously, the gravel layer has the effect of infiltration moisture again, provide moisture for the root system of plant.

A ventilation pipe is vertically arranged in the pond body, the ventilation pipe is fixed with the pit cover, the top end of the ventilation pipe penetrates out of the pit cover to be communicated with the outside, and the bottom end of the ventilation pipe is close to the vegetation planted on the soil layer; the water storage tank is characterized in that a sewer pipe is vertically arranged in the tank body, the sewer pipe is fixed with the pit cover, the top end of the sewer pipe penetrates out of the pit cover and is connected with a water tank, the bottom end of the sewer pipe is communicated with the water storage area, a third electromagnetic valve is arranged in the sewer pipe, a water level meter is arranged in the water storage area, and the third electromagnetic valve and the water level meter are both connected with a second controller through circuits. The ventilation pipe plays the effect that air and outside air exchange flow in the pit, plays the effect that provides natural air environment for the growth of vegetation in the pit, the bottom of ventilation pipe with plant the vegetation on the loam layer and be close to mutually, and its purpose, the hot-air that the greenhouse effect produced in the pit upwards promotes, prevents that the hot-air from directly scattering and disappearing to the external world from the ventilation pipe in, reduces scattering and disappearing of pit inner space heat. A water level instrument is arranged in the water storage area, when the water level is lower than the gravel layer, the second controller controls the electromagnetic valve III to be opened, and water in the water tank is supplemented into the water storage area.

The lighting device is used for providing illumination for planting in the pool body and comprises a light collector, a light reflecting pipe and a diffuser, the light collector is arranged at the top of the pit cover, the diffuser is arranged above vegetation in the pool body, and the light reflecting pipe is connected with the light collector and the diffuser. The light collector receives external sunlight, the light is reflected to the diffuser through the light reflecting tube, the diffuser irradiates the light to vegetation in the pit, a light source is provided for vegetation growth, and meanwhile, the effect of irradiation temperature rise is achieved for the environment inside the pit.

The methane fermentation tank comprises a tank cover, a methane tank, a methane outlet nozzle, a heat collecting device, a heat collecting box, a heat conducting inner container, a heat insulating cavity, a heat insulating agent, a gas inlet, a gas outlet, a methane discharging nozzle, a plurality of upper heat absorbing sheets, a plurality of lower heat absorbing sheets, a methane tank and a methane tank, wherein the tank cover of the methane fermentation tank is provided with the gas outlet nozzle, the gas outlet nozzle is connected with the heat collecting device through a gas pipe, the heat insulating cavity is filled with the heat insulating agent, one end of the heat conducting inner container is provided with the gas inlet, the other end of the heat conducting inner container is provided with the gas outlet, the gas pipe penetrates through the heat collecting box and is communicated with the gas inlet of the heat conducting inner container, the gas outlet is provided with the gas discharging nozzle, the top of the inner cavity of the heat conducting inner container is vertically fixed with the upper heat absorbing sheets, the upper heat absorbing sheets are uniformly distributed along the direction from the gas inlet to the gas outlet, the upper heat absorbing sheets and the lower heat absorbing sheets are arranged in a mutually crossed manner to divide the inner cavity of the heat-conducting inner container into a folded channel communicated with the air inlet and the air outlet, and the second heat radiating sheet is arranged at the upper part of the tank cavity in the tank body and connected with the heat-conducting inner container through a heat pipe. When the biogas is used, the biogas is discharged from the inside of the biogas fermentation tank through the gas outlet nozzle, the biogas in the fermentation tank has a certain temperature, the heat in the biogas fermentation tank can be taken away during discharging, the biogas discharged from the biogas fermentation tank is subjected to heat recovery through the heat collecting device, the heat is transferred to the second radiating fins through the heat guide pipes, and the biogas slurry in the tank is subjected to heat preservation through the second radiating fins. Biogas in the biogas fermentation tank body is discharged from a gas outlet nozzle of the tank cover, enters a gas inlet of the heat-conducting inner container through a gas conveying pipe, flows through a folding channel formed by the upper heat absorbing sheets and the lower heat absorbing sheets, and is discharged from a heat collecting device through a gas outlet nozzle to be used by a biogas water heater. The heat insulation agent is filled in the heat insulation cavity, so that the heat loss of the heat conduction inner container to the outside of the heat collection box is reduced.

The device comprises a pressurizing device for maintaining the methane pressure in a methane fermentation tank body, wherein the pressurizing device comprises a pressurizing cylinder, the pressurizing cylinder comprises a pressurizing cylinder body, a pressurizing piston and a pressurizing piston rod, the inner cavity of the pressurizing cylinder body is connected with a pressurizing air pipe, the other end of the pressurizing air pipe is communicated with the bottom of the tank cavity of the methane fermentation tank body, the pressurizing piston rod is connected with a rebounding mechanism, the rebounding mechanism comprises a barrel-shaped rebounding cabin, the bottom end of the rebounding cabin is an open end, the top end of the rebounding cabin is a closed end, the bottom end of the rebounding cabin is fixed with the pressurizing cylinder body, the top end of the rebounding cabin is provided with a through hole, the pressurizing piston rod extending out of the part of the pressurizing cylinder body extends into the rebounding cabin and penetrates out of the through hole at the top end of the rebounding cabin, an annular retaining ring is fixed on the pressurizing piston rod, a compression spring is further sleeved on the pressurizing piston rod, and one end of the annular retaining ring is abutted against the annular retaining ring, the other end of the elastic component is abutted against the top end of the rebound cabin. The pressure of the methane in the methane fermentation tank body is increased through the supercharging device, and sufficient firepower is provided for the methane water heater when the methane water heater is used. When marsh gas increases in the cell body, the space atmospheric pressure of natural pond liquid top in the cell body increases, make natural pond liquid flow direction pressure boost trachea, the air in the pressure boost trachea is compressed, promote pressure boost piston and remove in the pressure boost cylinder body, pressure boost piston drives the pressure boost piston rod and removes, pressure boost piston rod passes through annular retaining ring extrusion compression spring at the in-process that removes, compression spring has the potential energy this moment, when using marsh gas, marsh gas in the cell body discharges gradually, at this moment, the potential energy that compression spring stored slowly releases, promote the piston and remove, maintain the atmospheric pressure of marsh gas in the cell body, improve the burning firepower that marsh gas utensil used.

Compared with the prior art, the invention has the following advantages:

1. the invention utilizes the methane as fuel to assist in heating to heat the greenhouse, and has the advantages of economy and energy saving.

2. According to the invention, the honeycomb ducts are covered and distributed on the greenhouse film of the greenhouse, so that the heat loss in the greenhouse is reduced, and the greenhouse has the advantage of good heat preservation.

3. According to the invention, the biogas slurry in the tank body is circulated and flowed through the diffusion device, so that the heated biogas slurry is rapidly dispersed to each region in the tank body, the temperature balance of the biogas slurry in the tank body is improved, the temperature difference of each part of the biogas slurry in the tank body is reduced, and the biogas fermentation effect is improved.

4. According to the invention, the biogas slurry in the tank body is pumped into the biogas slurry heating device through the liquid pumping device for heating, and the biogas slurry heating has the advantage of high speed.

5. According to the invention, the sunlight from the outside is irradiated to the vegetation in the pit through the lighting device, and the greenhouse effect is utilized to preserve heat of the pool body, so that the energy-saving advantage is achieved.

6. The invention utilizes the supercharging device to maintain the gas pressure of the methane in the methane fermentation tank body, thereby improving the use performance of the methane.

7. According to the invention, the fermentation raw materials can be fully contacted with the microorganisms through the diffusion device, so that the fermentation effect is improved.

8. According to the invention, the helical blades in the diffusion device rotate to enable the biogas slurry to lift upwards in the guide cover, the influence of the gradual reduction of the volume from the bottom end to the top end of the inner cavity of the guide cover is received, and the biogas slurry in the guide cover is discharged from the diffusion pipe under the pressure, so that the advantages of good circulation fluidity, sufficient flow and the like of the biogas slurry in the tank body are achieved, and the balance of the temperature of the biogas slurry in the tank body is improved.

9. The invention takes the heat pipe as the heat transfer path, and has the advantages of high heat transfer speed and high transmission efficiency.

Drawings

Fig. 1 is a schematic structural view of the greenhouse of the present invention in the forward direction.

Fig. 2 is a schematic structural diagram of a biogas heating auxiliary system in the invention.

Fig. 3 is a schematic view of the structure of the greenhouse of the present invention facing away from the greenhouse.

FIG. 4 is a schematic view of the laying structure of the geothermal pipe in the greenhouse of the present invention.

FIG. 5 is a schematic view of the structure of the heat collecting plate in the water storage tank of the present invention.

Fig. 6 is a schematic structural view of the liquid extracting device in the present invention.

Fig. 7 is a schematic structural view of the supercharging apparatus of the present invention.

In the figure, 1, a pit; 2. a pit cover; 3. a tank body; 4. a tank cover; 5. a heat sink; 51. a first heat sink; 52. a frame; 7. a diffusion device; 71. a pod; 72. a helical blade; 73. a rotating shaft; 74. a diffuser tube; 8. a biogas slurry heating device; 81. a second solar heat collecting tube; 82. a first transverse pipe; 83. bending the pipe; 84. a first electromagnetic valve; 85. a transfusion tube; 86. a second electromagnetic valve; 87. a horizontal pipe II; 9. a liquid pumping device; 92. a hydraulic cylinder block; 93. a hydraulic piston; 94. a hydraulic piston rod; 95. a first air leakage hole; 10. a telescopic cylinder; 11. an electronic thermometer; 12. planting vegetation; 121. a honeycomb panel; 122. a gravel layer; 123. a layer of clay; 124. a water storage area; 13. vegetation; 14. a vent pipe; 15. a sewer pipe; 16. a water tank; 17. a third electromagnetic valve; 18. a water level meter; 20. a light collector; 21. a light-reflecting tube; 22. a diffuser; 23. a heat collection device; 231. a heat collection tank; 232. a heat conducting inner container; 233. a thermally insulating cavity; 234. an upper heat absorbing sheet; 235. a lower heat absorption sheet; 236. a folded channel; 237. a second heat sink; 24. a pressure boosting device; 242. a pressurizing cylinder body; 243. a booster piston; 244. a booster piston rod; 245. pressurizing the air pipe; 246. a rebound cabin; 247. an annular retainer ring; 248. a compression spring; 249. a second air leakage hole; 25. a drive motor; 26. a shed frame; 27. film mulching; 28. a flow guide pipe; 28a, a liquid inlet end; 28b, a liquid outlet end; 29. a geothermal pipe; 30. a biogas heating device; 30a, a water storage tank; 30b, a methane water heater; 30c, a circulating pump II; 31. a water storage tank; 32. a first circulating pump; 33. a heat collecting sheet.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, an agricultural greenhouse with a biogas heating auxiliary system comprises a greenhouse frame 26 and a transparent greenhouse film 27, the greenhouse frame 26 is supported on the ground, the greenhouse film 27 covers the greenhouse frame 26, the biogas heating auxiliary system comprises a biogas fermentation tank, the biogas fermentation tank is arranged in a pit 1, the pit 1 is dug from the ground, the top of the pit 1 is covered by a pit cover 2, in this embodiment, the bottom surface and the side walls of the pit 1 are provided with concrete waterproof layers, the agricultural greenhouse is characterized in that the biogas fermentation tank comprises a tank body 3 and a tank cover 4, the tank body 3 is provided with a tank cavity, the tank cover 4 is hermetically fixed at the top end of the tank body 3, the bottom of the tank body 3 is supported on the bottom surface of the pit 1 through upright posts, the biogas heating auxiliary system comprises an internal heating auxiliary system and an external heating auxiliary system, the internal heating auxiliary system comprises a radiator 5 arranged in the center of the inner bottom of the tank body 3 for heating biogas slurry, the heat radiator 5 is connected with a heat supply device 6, a diffusion device 7 used for conveying biogas slurry heated by the heat radiator 5 to the top and the periphery of the pool body 3 is arranged above the heat radiator 5, the internal heating auxiliary system also comprises a biogas slurry heating device 8 arranged above the pit cover 2, the biogas slurry heating device 8 is communicated with the inner bottom of the pool body 3 of the biogas fermentation pool through a pipeline, the biogas slurry heating device 8 is connected with a liquid pumping device 9 which can pump biogas slurry in the pool body 3 into the biogas slurry heating device 8 and can discharge biogas slurry in the biogas slurry heating device 8 into the pool body 3, the external heating auxiliary system comprises a vegetation planting base 12 arranged at the bottom of the pit 1, and vegetation 13 is planted on the vegetation planting base 12; a transparent guide pipe 28 is laid on the top surface of the greenhouse film 27, in this embodiment, the guide pipe 28 is flat, so that the contact area between the guide pipe 28 and the greenhouse film 27 is increased, and the coverage rate of the guide pipe 28 on the top surface of the greenhouse film 27 is improved, in this embodiment, the width of the guide pipe 28 is 50mm, the thickness of the guide pipe 28 is 5mm, the distance between two adjacent folded guide pipes 28 is 10mm, the guide pipe 28 is made of transparent plastic material, the guide pipe 28 is fixed on the greenhouse frame 26 by a binding tape, the guide pipe 28 is provided with a liquid inlet end 28a and a liquid outlet end 28b, the guide pipe 28 is folded and covered on the top surface of the greenhouse film 27 and abuts against the top surface of the greenhouse film 27, a geothermal pipe 29 is laid on the ground in the greenhouse, the geothermal pipe 29 is provided with an input end and an output end, the geothermal pipe 29 is folded and distributed on the ground in the greenhouse, the biogas heating device 30 capable of providing hot water circulation in the geothermal pipe 29 is connected to the geothermal pipe 29, biogas generated by the biogas fermentation tank is connected with the biogas heating device 30 through a gas pipe, the liquid inlet end 28a of the flow guide pipe 28 is connected with a water storage tank 31 through a connecting pipe, the water storage tank 31 is also connected with the output port of a first circulating pump 32 through a connecting pipe, the input port of the first circulating pump 32 is connected with the liquid outlet end 28b of the flow guide pipe 28 through a connecting pipe, a heat collecting sheet 33 is arranged in the water storage tank 31, the heat collecting sheet 33 is connected with a first radiating fin 51 of the radiator 5 through a heat pipe, and the heat collecting sheet 33 and the first radiating fin 51 are both made of copper materials.

The biogas heating device 30 comprises a water storage tank 30a, the output end of the geothermal pipe 29 is communicated with the water storage tank 30a through a connecting pipe, the water storage tank 30a is also connected with the liquid inlet end of a biogas water heater 30b through a connecting pipe, the biogas water heater 30b is a product in the prior art, the liquid outlet end of the biogas water heater 30b is connected with the liquid inlet end of a circulating pump two 30c through a connecting pipe, the liquid outlet end of the circulating pump two 30c is connected with the input end of the geothermal pipe 29 through a connecting pipe, the biogas water heater 30b is provided with a gas input nozzle, and biogas generated by a biogas fermentation tank is connected with the gas input nozzle through a gas pipe.

The diffusion device 7 comprises an inverted funnel-shaped air guide sleeve 71 arranged above the radiator 5, the air guide sleeve 71 is provided with a conical inner cavity, the top end of the air guide sleeve 71 is a closed end, the bottom end of the air guide sleeve 71 is an open end communicated with the inner cavity, the outer wall of the bottom end of the air guide sleeve 71 is fixed with the side wall of the tank body 3 through a connecting rod, a spiral impeller is vertically arranged in the air guide sleeve 71 and comprises a spiral blade 72 and a rotating shaft 73, the rotating shaft 73 is penetrated and fixed in the center of the rotating blade, the diameter of the bottom to the top of the spiral blade 72 is gradually reduced, so that the extension from the bottom to the top of the spiral blade 72 can be abutted against the conical inner cavity wall of the air guide sleeve 71, a through hole is formed in the center of the top end of the air guide sleeve 71, the top end of the rotating shaft 73 is rotatably arranged in the through hole at the top end of the air guide sleeve 71, and the bottom end of the rotating shaft 73 downwards penetrates out of the bottom of the tank body 3 of the biogas fermentation tank body 3, and is connected with a driving mechanism, and make the extension of helical blade 72 bottom to top all with kuppe 71 is the toper inner chamber wall and contradicts, in this embodiment, driving mechanism includes driving motor 25, and the output shaft of driving motor 25 is connected with the bottom fixed of rotation axis 73, and the organism of driving motor 25 passes through the support to be fixed in the bottom surface of pit 1, and the lateral wall of kuppe 71 is seted up a plurality of diffusion holes that are linked together with kuppe 71 inner chamber, a plurality of diffusion holes are evenly distributed along kuppe 71's circumference and axial, the lateral wall of kuppe 71 is fixed with a plurality of diffusion tubes 74 that are linked together with the diffusion hole, and in this embodiment, the quantity of diffusion hole is fifty, and the quantity of diffusion tubes 74 is also fifty, and is fixed with the diffusion hole one-to-one correspondence.

The biogas slurry heating device 8 comprises a second solar heat collecting pipe 81 which is obliquely arranged, the second solar heat collecting pipe 81 is a product in the prior art, the bottom end of the second solar heat collecting pipe 81 is connected with a transverse pipe 82, the inner cavity of the second solar heat collecting pipe 81 is communicated with the inner cavity of the transverse pipe 82, one end of the transverse pipe 82 is a closed end, the other end of the transverse pipe 82 is an open end, the open end is connected with a bent pipe 83, the other end of the bent pipe 83 extends into the tank cover 4 of the biogas fermentation tank and is communicated with the inner cavity of the tank body 3, a first electromagnetic valve 84 is arranged in the bent pipe 83, the middle part of the transverse pipe 82 is connected with a liquid conveying pipe 85 through a pipe joint, a three-way pipe joint is adopted in the embodiment for connection, the other end of the liquid conveying pipe 85 extends into the bottom of the tank body 3 of the biogas fermentation tank and is communicated with the inner cavity of the tank body 3, a second electromagnetic valve 86 is arranged in the liquid conveying pipe 85, and the top end of the second solar heat collecting pipe 81 is connected with a transverse pipe 87, the inner cavity of the second solar heat collecting pipe 81 is communicated with the inner cavity of the second transverse pipe 87, one end of the second transverse pipe 87 is a closed end, the other end of the second transverse pipe 87 is an open end, the open end is connected with the liquid pumping device 9 through a connecting pipe, the first electromagnetic valve 84 and the second electromagnetic valve 86 are both connected with a first controller through lines, and the first controller is a PLC programmable controller.

As shown in fig. 6, the liquid pumping device 9 comprises a hydraulic cylinder, the hydraulic cylinder comprises a hydraulic cylinder body 92, a hydraulic piston 93 and a hydraulic piston rod 94, the hydraulic piston 93 is in sealing fit with the inner wall of the hydraulic cylinder body 92, one end of the hydraulic piston rod 94 is fixed with the hydraulic piston 93, the other end extends out of the hydraulic cylinder body 92, one side of the hydraulic cylinder body 92, which is located at the hydraulic piston rod 94, is provided with a first air release hole 95, when the hydraulic piston rod 94 pushes the hydraulic piston 93 to move in the hydraulic cylinder body 92 in a sealing manner, the first air release hole 95 plays a role in balancing air pressure inside and outside the hydraulic cylinder body 92, the hydraulic cylinder body 92 is provided with a liquid inlet and outlet nozzle, the liquid inlet and outlet nozzle is communicated with the open end of the second transverse pipe 87 through a connecting pipe, the hydraulic piston rod 94 of the hydraulic cylinder is connected with a piston rod of a telescopic cylinder 10, an electronic thermometer 11 is arranged in the second transverse pipe 87, and the electronic thermometer 11 and the telescopic cylinder 10 are both connected with a first controller through a circuit.

The vegetation planting base 12 comprises a honeycomb plate 121 horizontally arranged below the biogas fermentation tank, the honeycomb plate 121 is supported on the bottom surface of the pit 1 through a stand column, the honeycomb plate 121 is a product in the prior art, honeycomb holes penetrating through the top surface and the bottom surface of the honeycomb plate 121 are densely distributed on the honeycomb plate 121, a gravel layer 122 is paved on the honeycomb plate 121, the gravel layer 122 is paved by gravels, a soil layer 123 is paved on the gravel layer 122, vegetation 13 is planted in the soil layer 123, and a water storage area 124 is formed between the soil layer 123 and the bottom surface of the tank body 3.

A ventilation pipe 14 is vertically arranged in the tank body 3, the ventilation pipe 14 is fixed with the pit cover 2, in the embodiment, a mounting hole is formed in the pit cover 2, the top end of the ventilation pipe 14 penetrates out of the pit cover 2 from the mounting hole to be communicated with the outside, the ventilation pipe 14 is clamped and fixed in the mounting hole, and the bottom end of the ventilation pipe 14 is close to vegetation 13 planted on a soil layer 123; vertical downcomer 15 that is provided with in the cell body 3, downcomer 15 is fixed with hole lid 2, in this embodiment, the mounting hole has been seted up at hole lid 2, the top of downcomer 15 is worn out hole lid 2 and is connected with a water tank 16 through the mounting hole, downcomer 15 card is fixed in the mounting hole, the bottom and the catch area 124 intercommunication of downcomer 15, be provided with three 17 of solenoid valve in the downcomer 15, be provided with water level meter 18 in the catch area 124, three 17 of solenoid valve and water level meter 18 all are connected with a second controller through the circuit, this second controller is PLC programmable controller.

The lighting device is used for providing illumination for vegetation 13 in the tank body 3 and comprises a light collector 20, a light reflecting pipe 21 and a diffuser 22, wherein the light collector 20 is arranged at the top of the pit cover 2 through a support, the light collector 20 is a product in the prior art and has a lighting effect, the diffuser 22 is arranged above the vegetation 13 in the tank body 3, the light reflecting pipe 21 is connected with the light collector 20 and the diffuser 22, and the diffuser 22 and the light reflecting pipe 21 are products in the prior art.

The methane fermentation pool cover 4 is provided with an air outlet nozzle, the air outlet nozzle is connected with a heat collecting device 23 through an air delivery pipe, the heat collecting device 23 comprises a heat collecting box 231, a heat conducting inner container 232 is arranged in the heat collecting box 231, the heat conducting inner container 232 is made of copper material and has better heat conducting capacity, the heat conducting inner container 232 is provided with an inner cavity, a heat insulating cavity 233 is formed between the heat conducting inner container 232 and the heat collecting box 231, the heat insulating cavity 233 is filled with heat insulating agent, in the embodiment, the heat insulating cavity 233 is filled with foaming heat insulating agent, one end of the heat conducting inner container 232 is provided with an air inlet, the other end is provided with an air outlet, the air delivery pipe penetrates through the heat collecting box 231 and is communicated with the air inlet of the heat conducting inner container 232, the air outlet is provided with an air exhaust nozzle, the air exhaust nozzle is connected with a fuel gas input nozzle of a methane water heater 30b through a connecting pipe, the top of the inner cavity of the heat conducting inner container 232 is vertically fixed with a plurality of upper heat absorbing sheets 234, and the upper heat absorbing sheets 234 are uniformly distributed along the direction from the air inlet to the air outlet, the bottom of the inner cavity of the heat-conducting inner container 232 is vertically fixed with a plurality of lower heat-absorbing sheets 235, the plurality of lower heat-absorbing sheets 235 are uniformly distributed along the direction from the air inlet to the air outlet, the plurality of upper heat-absorbing sheets 234 and the plurality of lower heat-absorbing sheets 235 are arranged in a mutually crossed manner, the inner cavity of the heat-conducting inner container 232 is divided into a folded channel 236 communicated with the air inlet and the air outlet, in the embodiment, the upper heat-absorbing sheets 234 and the lower heat-absorbing sheets 235 are made of copper materials, the number of the upper heat-absorbing sheets 234 is four, the number of the lower heat-absorbing sheets 235 is three, the upper part of the inner cavity of the tank body 3 is provided with a second cooling fin 237, the second cooling fin 237 is made of copper materials, the second cooling fin is fixed on the side wall of the tank body 3 through a connecting rod, and the second cooling fin 237 is connected with the heat-conducting inner container 232 through a heat conducting pipe.

As shown in fig. 7, the pressurizing device 24 for maintaining the biogas pressure in the biogas fermentation tank body 3, the pressurizing device 24 includes a pressurizing cylinder, the pressurizing cylinder includes a pressurizing cylinder body 242, a pressurizing piston 243 and a pressurizing piston rod 244, the pressurizing piston 243 is in sealing fit with the inner wall of the pressurizing cylinder body 242, one end of the pressurizing piston rod 244 is fixed with the pressurizing piston 243, the other end extends out of the pressurizing cylinder body 242, the pressurizing cylinder body 242 is provided with a second air-release hole 249 at one side of the pressurizing piston rod 244, when the pressurizing piston rod 244 pushes the pressurizing piston 243 to move in the pressurizing cylinder body 242 in a sealing manner, the second air-release hole 249 plays a role of balancing the inner and outer pressures of the pressurizing cylinder body 242, the inner cavity of the pressurizing cylinder body 242 is connected with a pressurizing air pipe 245, the other end of the pressurizing air pipe 245 is communicated with the bottom of the tank cavity of the biogas fermentation tank body 3, the pressurizing piston rod 244 is connected with a rebounding mechanism, the rebounding mechanism includes a barrel-shaped rebounding cabin 246, the bottom end of the rebound cabin 246 is an open end, the top end is a closed end, the bottom end of the rebound cabin 246 is fixed with the pressurizing cylinder 242, the top end of the rebound cabin 246 is provided with a through hole, the pressurizing piston rod 244 extending out of the pressurizing cylinder 242 extends into the rebound cabin 246 and penetrates out of the through hole at the top end of the rebound cabin 246, the pressurizing piston rod 244 is fixed with an annular retainer ring 247, the pressurizing piston rod 244 is further sleeved with a compression spring 248, one end of the compression spring 248 abuts against the annular retainer ring 247, and the other end of the compression spring 248 abuts against the top end of the rebound cabin 246.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments, or alternatives may be employed, by those skilled in the art, without departing from the spirit or ambit of the invention as defined in the appended claims.

Although 1, a pit is used more herein; 2. a pit cover; 3. a tank body; 4. a pool cover; 5. a heat sink; 51. a first heat sink; 52. a frame; 7. a diffusion device; 71. a pod; 72. a helical blade; 73. a rotating shaft; 74. a diffuser tube; 8. a biogas slurry heating device; 81. a second solar heat collecting tube; 82. a first transverse pipe; 83. bending the pipe; 84. a first electromagnetic valve; 85. a transfusion tube; 86. a second electromagnetic valve; 87. a horizontal pipe II; 9. a liquid pumping device; 92. a hydraulic cylinder block; 93. a hydraulic piston; 94. a hydraulic piston rod; 95. a first air leakage hole; 10. a telescopic cylinder; 11. an electronic thermometer; 12. planting vegetation; 121. a honeycomb panel; 122. a gravel layer; 123. a layer of clay; 124. a water storage area; 13. vegetation; 14. a vent pipe; 15. a sewer pipe; 16. a water tank; 17. a third electromagnetic valve; 18. a water level meter; 20. a light collector; 21. a light-reflecting tube; 22. a diffuser; 23. a heat collection device; 231. a heat collection tank; 232. a heat conducting inner container; 233. a thermally insulating cavity; 234. an upper heat absorbing sheet; 235. a lower heat absorption sheet; 236. a folded channel; 237. a second heat sink; 24. a pressure boosting device; 242. a pressurizing cylinder body; 243. a booster piston; 244. a booster piston rod; 245. pressurizing the air pipe; 246. a rebound cabin; 247. an annular retainer ring; 248. a compression spring; 249. a second air leakage hole; 25. a drive motor; 26. a shed frame; 27. greenhouse film; 28. a flow guide pipe; 28a, a liquid inlet end; 28b, a liquid outlet end; 29. a geothermal pipe; 30. a biogas heating device; 30a, a water storage tank; 30b, a methane water heater; 30c, a circulating pump II; 31. a water storage tank; 32. a first circulating pump; 33. heat collecting fins, etc., without excluding the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims

1. An agricultural greenhouse with a biogas heating auxiliary system, the greenhouse comprises a greenhouse frame (26) and a transparent greenhouse film (27), the greenhouse frame (26) is supported on the ground, the greenhouse film (27) covers the greenhouse frame (26), the biogas heating auxiliary system comprises a biogas fermentation tank, the biogas fermentation tank is arranged in a pit (1), the pit (1) is dug from the ground, the top of the pit (1) is covered with a pit cover (2), the agricultural greenhouse is characterized in that the biogas fermentation tank comprises a tank body (3) and a tank cover (4), the tank body (3) is provided with a tank cavity, the tank cover (4) is hermetically fixed at the top end of the tank body (3), the bottom of the tank body (3) is supported on the bottom surface of the pit (1) through a stand column, the biogas heating auxiliary system comprises an internal heating auxiliary system and an external heating auxiliary system, the internal heating auxiliary system comprises a heating tank body (3) arranged in the center of the inner bottom of the tank body (3) for heating the tank body (27) 3) The heat radiator (5) for the inner biogas slurry, the heat radiator (5) comprises first heat radiating fins (51), the first heat radiating fins (51) are fixed on the bottom surface of the tank body (3) through a frame (52), a diffusion device (7) used for conveying the biogas slurry heated by the heat radiator (5) to the top and the periphery of the tank body (3) is arranged above the heat radiator (5), the inner heating auxiliary system further comprises a biogas slurry heating device (8) arranged above the pit cover (2), the biogas slurry heating device (8) is communicated with the inner bottom of the tank body (3) of the biogas fermentation tank through a pipeline, the biogas slurry heating device (8) is connected with a liquid pumping device (9) capable of pumping the biogas slurry in the tank body (3) into the biogas slurry heating device (8) and discharging the biogas slurry in the biogas slurry heating device (8) into the tank body (3), the external heating auxiliary system comprises a vegetation planting base (12) arranged at the bottom of the pit (1), and vegetation (13) is planted on the vegetation planting base (12); a transparent guide pipe (28) is laid on the top surface of the greenhouse film (27), the guide pipe (28) is provided with a liquid inlet end (28a) and a liquid outlet end (28b), the guide pipe (28) is distributed on the top surface of the greenhouse film (27) in a folding manner and is abutted against the top surface of the greenhouse film (27), a geothermal pipe (29) is laid on the ground in the greenhouse, the geothermal pipe (29) is provided with an input end and an output end, the geothermal pipe (29) is distributed on the ground in the greenhouse in a folding manner, the geothermal pipe (29) is connected with a biogas heating device (30) capable of providing hot water circulation in the geothermal pipe (29), biogas generated by the biogas fermentation tank is connected with the biogas heating device (30) through a gas pipe, the liquid inlet end (28a) of the guide pipe (28) is connected with a water storage tank (31) through a connecting pipe, and the water storage tank (31) is further connected with an output port of a circulating pump (32) through a connecting pipe, an input port of the first circulating pump (32) is connected with a liquid outlet end (28b) of the flow guide pipe (28) through a connecting pipe, a heat collecting sheet (33) is arranged in the water storage tank (31), and the heat collecting sheet (33) is connected with a first cooling fin (51) of the radiator (5) through a heat guide pipe;

the diffuser (7) comprises an inverted funnel-shaped air guide sleeve (71) arranged above the radiator (5), the air guide sleeve (71) is provided with a conical inner cavity, the top end of the air guide sleeve (71) is a closed end, the bottom end of the air guide sleeve (71) is an open end communicated with the inner cavity, the outer wall of the bottom end of the air guide sleeve (71) is fixed with the side wall of the pool body (3) through a connecting rod, a spiral impeller is vertically arranged in the air guide sleeve (71) and comprises a spiral blade (72) and a rotating shaft (73), the rotating shaft (73) penetrates through and is fixed at the center of the rotating blade, the diameter of the bottom to the top of the spiral blade (72) is gradually reduced, so that the extension of the bottom to the top of the spiral blade (72) can be abutted against the wall of the conical inner cavity of the air guide sleeve (71), and a through hole is formed in the center of the top end of the air guide sleeve (71), the top end of the rotating shaft (73) is rotatably arranged in a through hole at the top end of the flow guide cover (71), the bottom end of the rotating shaft (73) downwards penetrates out of the bottom of the biogas fermentation tank body (3) and is connected with a driving mechanism, the extension from the bottom to the top of the helical blade (72) is in contact with the inner cavity wall of the flow guide cover (71), the outer side wall of the flow guide cover (71) is provided with a plurality of diffusion holes communicated with the inner cavity of the flow guide cover (71), the diffusion holes are uniformly distributed along the circumferential direction and the axial direction of the flow guide cover (71), and the outer side wall of the flow guide cover (71) is fixedly provided with a plurality of diffusion pipes (74) communicated with the diffusion holes;

the biogas slurry heating device (8) comprises a second solar heat collecting pipe (81) which is obliquely arranged, the bottom end of the second solar heat collecting pipe (81) is connected with a transverse pipe I (82), the inner cavity of the second solar heat collecting pipe (81) is communicated with the inner cavity of the transverse pipe I (82), one end of the transverse pipe I (82) is a closed end, the other end of the transverse pipe I is an open end, the open end is connected with a bent pipe (83), the other end of the bent pipe (83) extends into a tank cover (4) of the biogas fermentation tank and is communicated with the inner cavity of the tank body (3), a first electromagnetic valve (84) is arranged in the bent pipe (83), the middle part of the transverse pipe I (82) is connected with a liquid conveying pipe (85) through a pipe joint, the other end of the liquid conveying pipe (85) extends into the bottom of the tank body (3) of the biogas fermentation tank and is communicated with the inner cavity of the tank body (3), a second electromagnetic valve (86) is arranged in the liquid conveying pipe (85), the top end of the second solar heat collecting pipe (81) is connected with a second transverse pipe (87), the inner cavity of the second solar heat collecting pipe (81) is communicated with the inner cavity of the second transverse pipe (87), one end of the second transverse pipe (87) is a closed end, the other end of the second transverse pipe is an open end, the open end is connected with the liquid pumping device (9) through a connecting pipe, and the first electromagnetic valve (84) and the second electromagnetic valve (86) are both connected with a first controller through a circuit.

2. The agricultural greenhouse with the auxiliary methane heating system as claimed in claim 1, wherein the methane heating device (30) comprises a water storage tank (30a), the output end of the geothermal pipe (29) is communicated with the water storage tank (30a) through a connecting pipe, the water storage tank (30a) is further connected with the liquid inlet end of a methane water heater (30b) through a connecting pipe, the liquid outlet end of the methane water heater (30b) is connected with the liquid inlet end of a second circulating pump (30c) through a connecting pipe, the liquid outlet end of the second circulating pump (30c) is connected with the input end of the geothermal pipe (29) through a connecting pipe, the methane water heater (30b) is provided with a gas inlet nozzle, and methane generated by the methane fermentation tank is connected with the gas inlet nozzle through a gas pipe.

3. The agricultural greenhouse with the biogas heating auxiliary system as claimed in claim 1, wherein the liquid pumping device (9) comprises a hydraulic cylinder, the hydraulic cylinder comprises a hydraulic cylinder body (92), a hydraulic piston (93) and a hydraulic piston rod (94), the hydraulic cylinder body (92) is provided with a liquid inlet and outlet nozzle, the liquid inlet and outlet nozzle is communicated with the open end of the transverse pipe II (87) through a connecting pipe, the hydraulic piston rod (94) of the hydraulic cylinder is connected with a piston rod of a telescopic cylinder (10), an electronic thermometer (11) is arranged in the transverse pipe II (87), and the electronic thermometer (11) and the telescopic cylinder (10) are both connected with the first controller through a line.

4. The agricultural greenhouse with the biogas heating auxiliary system as claimed in claim 1, wherein the vegetation planting base (12) comprises a honeycomb panel (121) horizontally arranged below the biogas fermentation tank, the honeycomb panel (121) is supported on the bottom surface of the pit (1) through a stand column, honeycomb holes penetrating through the top surface and the bottom surface of the honeycomb panel (121) are densely distributed on the honeycomb panel (121), a gravel layer (122) is paved on the honeycomb panel (121), a soil layer (123) is paved on the gravel layer (122), the vegetation (13) is planted in the soil layer (123), and a water storage area (124) is formed between the soil layer (123) and the bottom surface of the tank body (3).

5. The agricultural greenhouse with the biogas heating auxiliary system according to claim 4, wherein a ventilation pipe (14) is vertically arranged in the tank body (3), the ventilation pipe (14) is fixed with the pit cover (2), the top end of the ventilation pipe (14) penetrates out of the pit cover (2) to be communicated with the outside, and the bottom end of the ventilation pipe (14) is close to vegetation (13) planted on a soil layer (123); the pool body (3) is internally and vertically provided with a sewer pipe (15), the sewer pipe (15) is fixed with the pit cover (2), the top end of the sewer pipe (15) penetrates out of the pit cover (2) and is connected with a water tank (16), the bottom end of the sewer pipe (15) is communicated with a water storage area (124), the sewer pipe (15) is internally provided with a third electromagnetic valve (17), the water storage area (124) is internally provided with a water level meter (18), and the third electromagnetic valve (17) and the water level meter (18) are both connected with a second controller through a line.

6. The agricultural greenhouse with the biogas heating auxiliary system as claimed in claim 1, comprising a lighting device for providing illumination to the vegetation (13) in the tank body (3), wherein the lighting device comprises a light collector (20), a reflective tube (21) and a diffuser (22), the light collector (20) is arranged on the top of the pit cover (2), the diffuser (22) is arranged above the vegetation (13) in the tank body (3), and the reflective tube (21) is connected with the light collector (20) and the diffuser (22).

7. The agricultural greenhouse with the biogas heating auxiliary system as claimed in claim 2, wherein the biogas fermentation tank has a gas outlet nozzle on the tank cover (4), the gas outlet nozzle is connected with a heat collecting device (23) through a gas pipe, the heat collecting device (23) comprises a heat collecting tank (231), a heat conducting inner container (232) is arranged in the heat collecting tank (231), the heat conducting inner container (232) has an inner cavity, a heat insulating cavity (233) is formed between the heat conducting inner container (232) and the heat collecting tank (231), the heat insulating cavity (233) is filled with a heat insulating agent, one end of the heat conducting inner container (232) has a gas inlet and the other end has a gas outlet, the gas pipe passes through the heat collecting tank (231) and is communicated with the gas inlet of the heat conducting inner container (232), the gas outlet is provided with a row of gas nozzles, and the gas nozzles are connected with the input nozzle of the biogas water heater (30b) through a connecting pipe, the heat conduction inner container is characterized in that a plurality of upper heat absorbing sheets (234) are vertically fixed at the top of an inner cavity of the heat conduction inner container (232), the plurality of upper heat absorbing sheets (234) are uniformly distributed in the direction from the air inlet to the air outlet, a plurality of lower heat absorbing sheets (235) are vertically fixed at the bottom of the inner cavity of the heat conduction inner container (232), the plurality of lower heat absorbing sheets (235) are uniformly distributed in the direction from the air inlet to the air outlet, the plurality of upper heat absorbing sheets (234) and the plurality of lower heat absorbing sheets (235) are arranged in a cross mode, the inner cavity of the heat conduction inner container (232) is separated into a folding channel (236) communicated with the air inlet and the air outlet, second heat radiating fins (237) are arranged on the upper portion of an inner cavity of the pool body (3), and the second heat radiating fins (237) are connected with the heat conduction inner container (232) through heat pipes.

8. The agricultural greenhouse with the biogas heating auxiliary system as claimed in claim 1, comprising a pressurizing device (24) for maintaining biogas pressure in the biogas fermentation tank body (3), wherein the pressurizing device (24) comprises a pressurizing cylinder, the pressurizing cylinder comprises a pressurizing cylinder body (242), a pressurizing piston (243) and a pressurizing piston rod (244), an inner cavity of the pressurizing cylinder body (242) is connected with a pressurizing air pipe (245), the other end of the pressurizing air pipe (245) is communicated with the bottom of the tank cavity of the biogas fermentation tank body (3), the pressurizing piston rod (244) is connected with a rebounding mechanism, the rebounding mechanism comprises a barrel-shaped rebounding cabin (246), the bottom end of the rebounding cabin (246) is an open end, the top end of the rebounding cabin is a closed end, the bottom end of the rebounding cabin (246) is fixed with the pressurizing cylinder body (242), the top end of the rebounding cabin (246) is provided with a through hole, the boosting piston rod (244) extending out of the boosting cylinder body (242) extends into the rebound cabin (246) and penetrates out of a through hole in the top end of the rebound cabin (246), an annular retainer ring (247) is fixed on the boosting piston rod (244), a compression spring (248) is further sleeved on the boosting piston rod (244), one end of the compression spring (248) abuts against the annular retainer ring (247), and the other end of the compression spring abuts against the top end of the rebound cabin (246).