Percolate backflow spraying composting system special for solar greenhouse

Abstract

The invention relates to the technical field of fermentation composting, and discloses a special percolate backflow spraying composting system for a solar greenhouse, which is characterized in that the top of a composting barrel is detachably connected with a composting barrel cover plate, the bottom of the composting barrel is provided with a seepage hole, and the side wall of the composting barrel is provided with a discharge hole; the filter plate is horizontally arranged below the discharge hole in the composting barrel; the collecting tank is arranged below the composting barrel, the reflux pump is arranged in the collecting tank, one end of the reflux pipe is connected with a water outlet of the reflux pump, the other end of the reflux pipe penetrates through a cover plate of the composting barrel and extends into the composting barrel, and a spray head is arranged on the reflux pipe in the composting barrel; the spiral stirring rod is rotationally connected to the bottom of the composting barrel cover plate, the driving piece is arranged on the composting barrel cover plate, and a rotating shaft of the driving piece is connected with the spiral stirring rod; the percolate backflow spraying composting system special for the solar greenhouse is high in automation degree and good in stirring uniformity, percolate can be fully utilized, the moisture content of a compost body can be effectively controlled, and emission of greenhouse gas in the composting process is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of fermentation composting, and in particular to a leachate reflux spraying composting system dedicated to a solar greenhouse. Background Art

[0002] Aerobic composting technology has the advantages of large processing capacity, low cost, high efficiency, and simple operation. In addition, aerobic composting technology can effectively utilize the nutrients in livestock and poultry manure and improve soil quality. It is one of the economical and effective ways to treat and recycle livestock and poultry manure waste. However, the traditional aerobic composting method has problems such as low compost quality, long composting time, and unreasonable utilization of leachate generated during the composting process.

[0003] Relevant scholars have developed many related composting reaction equipment in aerobic composting. However, most of the composting equipment in the prior art will produce a certain amount of leachate, which will accumulate at the bottom of the composting box and directly affect the moisture content of the compost. At the same time, the leachate will change the living environment of aerobic bacteria at the bottom of the composting box, thereby affecting the composting effect, which is not conducive to the theoretical and technical research of aerobic composting technology and the promotion and practical application of organic solid waste utilization.

[0004] In view of this, how to invent a leachate reflow spraying composting system dedicated to solar greenhouses to improve these problems has become an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] The present invention proposes a special leachate reflow spraying composting system for solar greenhouse to solve the deficiencies in the above-mentioned prior art. The special leachate reflow spraying composting system for solar greenhouse can process the leachate to ensure the moisture content of the compost body and the living environment of aerobic bacteria.

[0006] The technical solution of the present invention is: a leachate reflux spraying composting system dedicated to a solar greenhouse, comprising:

[0007] A compost bucket, the top of which is detachably connected to a compost bucket cover plate, a seepage valve is provided at the bottom of the compost bucket, and a discharge port is provided on the side wall of the compost bucket;

[0008] The filter plate is horizontally arranged below the discharge port in the compost barrel;

[0009] The reflux component includes a collecting tank, a reflux pump and a reflux pipe, wherein the collecting tank is arranged below the compost bucket, the reflux pump is arranged in the collecting tank, one end of the reflux pipe is connected to the water outlet of the reflux pump, the other end of the reflux pipe passes through the compost bucket cover plate and extends into the compost bucket, and a nozzle is arranged on the reflux pipe in the compost bucket;

[0010] The stirring mechanism comprises a spiral stirring rod and a driving member, wherein the spiral stirring rod is rotatably connected to the bottom of the compost bucket cover, the driving member is arranged on the compost bucket cover, and the rotating shaft of the driving member is connected to the spiral stirring rod; the spiral stirring rod is used to flip the compost body upwards.

[0011] In at least one embodiment of the present invention, an aeration pipe is provided at the bottom of the compost barrel, the aeration pipe is located below the filter plate, the aeration pipe is connected to an air inlet pipe, the air inlet pipe passes through the filter plate and the compost barrel cover, and the outlet end of the air inlet pipe is connected to an aeration pump.

[0012] In at least one embodiment of the present invention, a water heat collecting tank is further included, and an air duct connected to the water heat collecting tank is provided on the cover plate of the compost barrel, and the air duct in the water heat collecting tank is connected to a gas distributor, and the gas distributor is located below the liquid level of the water heat collecting tank, and an air outlet pipe is provided on the top of the water heat collecting tank.

[0013] In at least one embodiment of the present invention, a controller is further included, a gas flow meter is provided on the air inlet pipe, a water flow meter is provided on the return pipe, and the gas flow meter, water flow meter, seepage valve, aeration pump, return pump and driving element are all connected to the controller signal.

[0014] In at least one embodiment of the present invention, the bottom end of the spiral stirring rod is rotatably connected to the filter plate.

[0015] In at least one embodiment of the present invention, one end of the reflux pipe close to the compost bin cover is connected to two branch pipes, both of which pass through the compost bin cover and extend into the compost bin, and two nozzles are provided, which are respectively arranged on the two branch pipes in the compost bin.

[0016] In at least one embodiment of the present invention, a plurality of sampling ports are longitudinally distributed on the side wall of the compost barrel, and a discharge door is provided on the discharge port.

[0017] In at least one embodiment of the present invention, temperature and humidity sensors are installed at the upper, middle and lower parts of the compost barrel, and a plurality of the temperature sensors are connected to the controller signals.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention provides a reflux member consisting of a collecting tank, a reflux pump and a reflux pipe, and a stirring mechanism consisting of a spiral stirring member and a driving member, so that the leachate generated during the composting process can be sprayed back into the compost barrel, and the pile in the compost barrel can be turned over by a spiral stirring rod, thereby effectively improving the moisture content of the pile, promoting the loosening and uniform mixing of the piles in the compost barrel, and preventing the pile from settling, compacting and hardening downward under the action of its own gravity, resulting in insufficient oxygen inside the pile, especially in the pile at the lower part of the compost reactor, forming an anaerobic environment, affecting the activity of aerobic microorganisms, and thus affecting the fermentation composting effect and fermentation efficiency.

[0020] 2. The present invention provides a ventilation assembly consisting of an aeration pipe and an aeration pump. When the pile in the compost barrel is stirred and loosened, the external aeration pump transports oxygen-rich air to the aeration pipe at the bottom of the compost barrel, and enters the compost barrel from the air outlet on the aeration pipe, so that the inside of the compost barrel and the pile are under aerobic conditions, which is beneficial to the fermentation and composting effect and efficiency of the pile, and avoids the occurrence of anaerobic conditions in the compost barrel, which affects the fermentation of the pile and produces odor.

[0021] 3. The present invention provides a gas flow meter on the air inlet pipe, a water flow meter on the reflux pipe, and a temperature sensor in the compost barrel. The gas flow meter, the water flow meter, the temperature sensor, the seepage valve, the aeration pump, the reflux pump, and the driving member are all connected to the controller signal. The controller can accurately monitor the state of the compost barrel in the compost barrel, select the stirring time according to the state of the compost, control the spraying amount of the seepage liquid and the aeration amount, and improve the automation degree of the entire composting system.

[0022] 4. The present invention, by setting up a water heat collection area consisting of a water heat collection tank, an air guide pipe and a tubular gas distributor, can retain the heat carried by the gas in the water heat collection tank, increase the internal temperature of the facility, reduce the emission of harmful gases, and at the same time increase the CO2 content inside the facility. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the main perspective structure of the present invention;

[0025] Figure 3 It is a rear view structural schematic diagram of the present invention;

[0026] Figure 4 This is a schematic diagram of the stirring mechanism and aeration pipe structure of the present invention;

[0027] Figure 5 It is a schematic diagram of the structure of the gas distributor of the present invention;

[0028] Figure 6 It is a schematic diagram of the top view structure of the present invention;

[0029] Figure 7 It is a schematic diagram of the filter plate structure of the present invention.

[0030] Description of reference numerals:

[0031] 1. Compost bin; 11. Compost bin cover; 12. Seepage port; 13. Discharge port; 14. Sampling port; 2. Filter plate; 3. Reflux component; 31. Collecting tank; 32. Reflux pump; 33. Reflux pipe; 331. Nozzle; 332. Branch pipe; 4. Stirring mechanism; 41. Spiral stirring rod; 42. Driving component; 5. Aeration pipe; 51. Air inlet pipe; 511. Gas flow meter; 6. Water collector tank; 61. Air guide pipe; 62. Gas distributor; 621. Main pipe; 622. Branch pipe; 63. Air outlet pipe; 7. Controller. DETAILED DESCRIPTION

[0032] The drawings in the present invention are not drawn strictly according to the actual scale, and the specific size and quantity of each structure can be determined according to actual needs. The drawings described in the present invention are only schematic diagrams of the structures.

[0033] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. The words "include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Inside", "outside", "up", "down", "far", "near", "front", "back" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0035] Combination Figures 1 to 7 As shown, a leachate return spraying composting system for a solar greenhouse comprises:

[0036] A compost barrel cover 11 is detachably connected to the top of the compost barrel 1. The compost barrel cover 11 and the compost barrel 1 are sealed by a V-shaped clamp to prevent the gas in the compost reaction barrel 1 from escaping from the gap of the compost barrel cover 11, thereby improving the air tightness of the compost reaction barrel 1. A seepage valve 12 is provided at the bottom of the compost barrel 1, and a discharge port 13 is provided on the side wall of the compost barrel 1.

[0037] During the fermentation composting process, the staff initially conducts a series of pretreatments such as straw shearing and crushing, carbon-nitrogen ratio determination, and moisture content adjustment, and then puts a certain amount of pig manure and apple sawdust into the composting barrel 1 of the equipment from the feed port. At the same time, in the process of adding pig manure and apple sawdust, exogenous additives are added to the composting barrel 1 simultaneously to improve the effect and efficiency of the fermentation composting.

[0038] The filter plate 2 is horizontally arranged below the discharge port 13 in the compost barrel 1, and a plurality of filter holes are evenly distributed on the filter plate 2 to prevent the collected leachate from being mixed with impurities and blocking the flow of the liquid at the bottom of the compost barrel 1;

[0039] The reflux member 3 includes a collecting tank 31, a reflux pump 32 and a reflux pipe 33. The collecting tank 31 is arranged below the composting barrel 1. The reflux pump 32 is arranged in the collecting tank 31. One end of the reflux pipe 33 is connected to the water outlet of the reflux pump 32. The other end of the reflux pipe 33 passes through the composting barrel cover 11 and extends into the composting barrel 1. A nozzle 331 is arranged on the reflux pipe 33 in the composting barrel 1. The nozzle 331 is a micro nozzle. During the composting process, the leachate generated in the composting barrel 1 will flow to the bottom of the aerobic composting barrel 1 under the action of gravity, enter the leachate collecting tank 31 through the filter plate 2 and the seepage valve for collection, and then enter the composting barrel 1 through the reflux pipe 33 and the nozzle 331 driven by the reflux pump 32. The compost leachate is characterized by the presence of high concentrations of biodegradable organic matter and nitrogen, phosphorus and potassium nutrients. The nutrients return to the compost body, improve the quality of the final compost product, and are beneficial to plant growth and development. The leachate also contains a large amount of water, which can be returned to the pile to adjust the moisture content of the pile in the composting reaction barrel, so that the pile maintains a certain humidity, which is conducive to the activity of composting microorganisms, accelerates the fermentation and composting process, and improves the composting efficiency. During the stirring process, the reflux pump 32 pumps the leachate out from the nozzle 331, and the nozzle 331 sprays the leachate evenly on the surface of the pile. In addition, the stirring of the spiral stirring rod 41 makes the leachate and the pile mixed evenly, preventing the fermentation process in the compost barrel 1 from being uneven.

[0040] The stirring mechanism 4 includes a spiral stirring rod 41 and a driving member 42. The spiral stirring rod 41 is rotatably connected to the bottom of the compost barrel cover 11. The driving member 42 is arranged on the compost barrel cover 11. The rotating shaft of the driving member 42 is connected to the spiral stirring rod 41. The driving member 42 is a variable frequency speed regulating motor. The spiral stirring rod 41 is used to flip the compost body upward. When the compost pile is stirred, the driving member 42 is started to drive the spiral stirring rod 41 to rotate, thereby flipping the compost body in the compost barrel 1, promoting loosening and uniform mixing between the compost bodies in the compost barrel 1, and avoiding the compost body from settling, compacting, and hardening downward under the action of its own gravity, resulting in insufficient oxygen inside the compost body, especially the compost body in the lower part of the compost reactor, forming an anaerobic environment, affecting the activity of aerobic microorganisms, thereby affecting the fermentation composting effect and fermentation efficiency.

[0041] As an alternative embodiment, an aeration pipe 5 is provided at the bottom of the compost barrel 1, and the aeration pipe 5 is located below the filter plate 2. The aeration pipe 5 is connected to an air inlet pipe 51, and the air inlet pipe 51 passes through the filter plate 2 and the compost barrel cover plate 11. The outlet end of the air inlet pipe 51 is connected to an aeration pump. Specifically, the aeration pipe 5 is a circular pipe, and a plurality of ball outlet holes are provided on the aeration pipe 5. When the pile in the compost barrel 1 is stirred and loosened, the external aeration pump transports oxygen-enriched air to the aeration pipe 5 at the bottom of the compost barrel 1. , enters the compost barrel 1 from the air outlet on the aeration pipe 5, so that the inside of the compost barrel 1 and the pile are under aerobic conditions, which is beneficial to the fermentation and composting effect and efficiency of the pile, and avoids the anaerobic situation in the compost barrel 1, which affects the fermentation of the pile and produces odor; the aeration pipe 5 is arranged below the filter plate 2, so that when the pile is stirred, the air outlet is not likely to be squeezed by the pile, thereby reducing the possibility of the air outlet being blocked by the pile during the use of the processing equipment, ensuring the normal operation of the processing equipment.

[0042] As an alternative embodiment, it also includes a water heat collecting tank 6, and a gas guide pipe 61 connected to the water heat collecting tank 6 is provided on the compost barrel cover 11. The gas guide pipe 61 in the water heat collecting tank 6 is connected to a gas distributor 62, and the gas distributor 62 is located below the liquid level of the water heat collecting tank 6. The top of the water heat collecting tank 6 is provided with an air outlet pipe 63. Specifically, the top of the water heat collecting tank 6 is provided with a detachable water heat collecting tank cover, and the water heat collecting tank cover is sealed and connected to the water heat collecting tank 6 by a V-shaped clamp. During the composting process, water is added to the water heat collecting tank 6 to 2 / 3 of the tank body. 3, close the water heat collecting tank cover and tighten it with a V-shaped clamp, turn on the aeration pump switch, and send oxygen-enriched air into the compost barrel 1. Due to the high air pressure in the compost barrel 1 and the stirring and loosening of the spiral stirring rod 41, the heat and greenhouse gases generated during the composting process are discharged from the tubular gas distributor 62 in the water heat collecting tank 6 through the air guide pipe 61. The heat in the compost barrel 1 increases the temperature of the water in the water heat collecting tank 6. The water heat collecting tank 6 is installed in the greenhouse to increase the greenhouse environment temperature and prevent the greenhouse from being damaged by low temperature in winter or in seasons with low temperatures. The tubular gas distributor 62 can increase the contact area between gas and water, so that the greenhouse gases such as NH3 generated by composting, which are harmful to the human body, can be more fully dissolved in water, and the discharged greenhouse gases can be prevented from polluting the environment while the CO2 that is not easily soluble in water can be discharged into the greenhouse, thereby increasing the CO2 concentration in the greenhouse and promoting the accumulation of plant photosynthetic products.

[0043] As an alternative embodiment, it also includes a controller 7, a gas flow meter 511 is provided on the air inlet pipe 51, and a water flow meter is also provided on the return pipe 33. The gas flow meter 511, the water flow meter, the aeration pump, the return pump 32 and the driving member 42 are all connected to the controller 7 by signal. The controller 7 can accurately monitor the state of the pile in the compost barrel 1, and select the stirring time according to the state of the pile, control the spraying amount of the seepage liquid and the aeration amount, thereby improving the automation degree of the entire composting system.

[0044] As an alternative embodiment, the bottom end of the spiral stirring rod 41 is rotatably connected to the filter plate 2 to improve the stability of the spiral stirring rod 41. Specifically, a fixing hole is provided on the filter plate 2. During the composting process, the bottom of the rotating shaft of the spiral stirring rod 41 is inserted into the fixing hole to prevent the spiral stirring rod 41 from becoming unstable during the stirring process and affecting the normal use of the processing equipment.

[0045] As an alternative embodiment, one end of the return pipe 33 close to the compost bin cover 11 is connected to two branch pipes 332 , both branch pipes 332 pass through the compost bin cover 11 and extend into the compost bin 1 , and both branch pipes 332 in the compost bin 1 are provided with nozzles 331 .

[0046] As an alternative embodiment, a plurality of sampling ports 14 are longitudinally distributed on the side wall of the compost barrel 1 , and a discharge door is provided on the discharge port 13 .

[0047] As an alternative embodiment, temperature and humidity sensors are installed in the upper, middle and lower parts of the compost barrel 1. It should be noted that the temperature and humidity sensors can monitor the temperature and humidity of the pile in the compost reactor. The specific model and specifications of the temperature and humidity sensors need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail. A control box is provided next to the compost reactor, and the control box includes a temperature monitoring system, an agitator speed control system and a reflux spraying device.

[0048] During the composting process, the compost temperature and humidity must be checked in time. When the temperature rises to 60°C, in order to prevent carbonization of organic matter and replenish oxygen in the pile, the pile should be turned and the humidity of the pile should be increased by starting the water pump to supplement the leachate as appropriate.

[0049] Working principle and usage of this embodiment:

[0050] The present invention provides a leachate reflux spraying composting system for a solar greenhouse. When the composting system is used, firstly, a proper amount of water is added to the water heat collecting tank 6 to ensure that the water completely submerges the tubular gas distributor 62 at the bottom of the water heat collecting tank 6, the water heat collecting tank cover is closed and the V-shaped clamp is closed, and temperature and humidity sensors are installed at the upper, middle and lower parts of the compost barrel 1. The stirring mechanism 4 is installed and the bottom end of the rotating shaft of the spiral stirring rod 41 is inserted into the fixing hole of the filter plate 2, and organic fertilizer raw materials are added to the inside of the compost barrel 1 through the feed port to 2 / 3 of the volume of the compost barrel 1, and the compost reaction barrel cover 11 is closed and the V-shaped clamp is closed. The driving member 42 is controlled by the controller 7 to adjust the rotating shaft speed of the spiral stirring rod 41.

[0051] After the preparation is completed, the driving member 42 is started, and the driving member 42 drives the spiral stirring rod 41 to rotate, so that the threaded conveying piece stirs the pile in the compost bucket 1 and pushes it upward. When the pile reaches a predetermined height, it falls due to gravity, so that the pile in the compost bucket 1 is turned over, and the pile in the compost bucket 1 is loosened and mixed evenly.

[0052] When the pile in the compost barrel 1 is stirred and loosened, the oxygen-rich air is transported to the aeration pipe 5 at the bottom of the compost barrel 1 by turning on the aeration pump switch, and enters the compost barrel 1 from the air outlet on the aeration pipe 5, so that the inside of the compost barrel 1 and the pile bodies are under aerobic conditions.

[0053] When the compost pile in the compost barrel 1 is stirred and loosened, the reflux pump 32 switch is turned on by the control system, and the leachate in the leachate collecting tank 31 is pumped into the compost barrel 1 through the nozzle 331, and evenly sprayed on the compost pile. The leachate and the compost pile are evenly mixed by stirring with the spiral stirring rod 41 to prevent the compost pile in the compost barrel 1 from fermenting in an uneven manner. Under the control of the control system, the leachate is returned to the compost pile through the nozzle 331, thereby increasing the organic matter and nutrient content in the compost pile, and ultimately improving the fermentation rate and the quality of the compost product.

[0054] During the composting process, the greenhouse gas generated forms a high-pressure environment in the compost barrel 1. In addition, the aeration pump ventilates and delivers air to the inside of the compost barrel 1 through the aeration pipe 5, so that the gas enters the water collector tank 6 through the air guide pipe 61 on the compost barrel cover and is discharged from the tubular gas distributor 62. The tubular gas distributor 62 increases the contact area between the greenhouse gas and water, so that most of the harmful gases such as ammonia are dissolved in water, and more CO2 is discharged into the facility through the exhaust pipe, which is beneficial to the photosynthesis of the plants in the facility and the accumulation of organic matter.

[0055] Composting of organic fertilizer is performed, and the temperature and humidity of the pile in the composting reactor are monitored through the temperature and humidity display on the control box. When the temperature and humidity sensor detects that the pile temperature rises to 60°C, oxygen needs to be introduced into the pile inside the composting reactor to prevent carbonization of organic matter. The aeration pump can be turned on by the control system to allow oxygen to enter the composting barrel 1, and the motor is started to rotate the spiral stirring rod 41 at the same time, so that oxygen is fully in contact with the pile to achieve the effect of cooling and oxygenation. And according to the humidity detected by the temperature and humidity sensor, it is determined whether water needs to be supplemented. When the moisture content in the pile is low, the return pump 32 and the driving member 42 are turned on by the control system. Under the action of the leachate reflux spraying system and the spiral stirring system, the moisture content of the pile is increased to prevent the low moisture content in the pile from causing low microbial activity and affecting the composting efficiency.

[0056] The above embodiments are only specific implementation methods of the patent of the present invention, which are used to illustrate the technical solution of the patent of the present invention rather than to limit it. The protection scope of the patent of the present invention is not limited thereto. Although the patent of the present invention is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution for implementing the patent of the present invention, and should be covered within the protection scope of the present invention.

Claims

1. A leachate reflux spraying composting system for solar greenhouse, characterized in that: include: A compost barrel (1) having a compost barrel cover plate (11) detachably connected to the top, a seepage port (12) provided at the bottom of the compost barrel (1), and a discharge port (13) provided on the side wall of the compost barrel (1); A filter plate (2) is horizontally arranged below the discharge port (13) in the compost barrel (1); A reflux member (3) comprises a collecting tank (31), a reflux pump (32) and a reflux pipe (33); the collecting tank (31) is arranged below the compost barrel (1); the reflux pump (32) is arranged in the collecting tank (31); one end of the reflux pipe (33) is connected to a water outlet of the reflux pump (32); the other end of the reflux pipe (33) passes through a compost barrel cover plate (11) and extends into the compost barrel (1); a nozzle (331) is arranged on the reflux pipe (33) in the compost barrel (1); The stirring mechanism (4) comprises a spiral stirring rod (41) and a driving member (42), wherein the spiral stirring rod (41) is rotatably connected to the bottom of the compost bucket cover (11), the driving member (42) is arranged on the compost bucket cover (11), and the rotating shaft of the driving member (42) is connected to the spiral stirring rod (41); the spiral stirring rod (41) is used to flip the compost body upwards.

2. A solar greenhouse leachate reflux spraying composting system as claimed in claim 1, characterized in that: An aeration pipe (5) is provided at the bottom of the compost barrel (1), the aeration pipe (5) is located below the filter plate (2), the aeration pipe (5) is connected to an air intake pipe (51), the air intake pipe (51) passes through the filter plate (2) and the compost barrel cover plate (11), and the outlet end of the air intake pipe (51) is connected to an aeration pump.

3. A leachate reflux spraying composting system for solar greenhouse as claimed in claim 2, characterized in that: It also includes a controller (7), the air inlet pipe (51) is provided with a gas flow meter (511), the return pipe (33) is also provided with a water flow meter, the seepage port (12) is provided with a seepage valve, and the gas flow meter (511), the water flow meter, the seepage valve, the aeration pump, the return pump (32) and the driving element (42) are all connected to the controller (7) by signals.

4. A leachate reflux spraying composting system for solar greenhouse as claimed in claim 3, characterized in that: Temperature and humidity sensors are installed at the upper, middle and lower parts of the compost barrel (1), and a plurality of the temperature sensors are connected to the controller (7) via signals.

5. A leachate reflux spraying composting system for solar greenhouse as claimed in claim 2, characterized in that: The compost barrel also comprises a water heat collecting tank (6); an air guide pipe (61) connected to the water heat collecting tank (6) is provided on the compost barrel cover plate (11); the air guide pipe (61) in the water heat collecting tank (6) is connected to a gas distributor (62); the gas distributor (62) is located below the liquid level of the water heat collecting tank (6); and an air outlet pipe (63) is provided on the top of the water heat collecting tank (6).

6. A leachate reflux spraying composting system for solar greenhouse as claimed in claim 1, characterized in that: One end of the return pipe (33) close to the compost barrel cover (11) is connected to two branch pipes (332), and the two branch pipes (332) both pass through the compost barrel cover (11) and extend into the compost barrel (1). Two nozzles (331) are provided, and the two nozzles (331) are respectively arranged on the two branch pipes (332) in the compost barrel (1).

7. A leachate reflux spraying composting system for solar greenhouse as claimed in claim 1, characterized in that: A plurality of sampling ports (14) are longitudinally distributed on the side wall of the compost barrel (1), and a discharge door is provided on the discharge port (13).

8. The leachate reflux spraying composting system for solar greenhouse as claimed in claim 1, characterized in that: The bottom end of the spiral stirring rod (41) is rotatably connected to the filter plate (2).

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