CN108238821A - A kind of energy saving Quick composting device of livestock and poultry feces and its application - Google Patents

Abstract

The invention discloses an energy-saving and fast composting device for livestock and poultry manure and its application. The composting device includes a vertical compost bin, a heat exchanger and a biological filter. The upper part of the vertical compost bin is connected with a conveying device, and the bottom part is connected with a discharge device connection; the top of the vertical compost bin is connected to the bottom of the heat exchanger through the exhaust gas output pipe, and the first fan is also provided on the tail gas output pipe; the upper part of the discharge device in the vertical compost bin is provided with a ventilation pipe, and the ventilation pipe is provided with a second fan. Three fans and a heat pump are connected to the top of the heat exchanger; there is also a condensate pipe between the heat pump and the heat exchanger; the top of the heat exchanger is connected to the biological filter through the tail gas discharge pipe, and the second fan is installed on the tail gas discharge pipe ; There is a stirring device above the interior of the vertical compost bin, and a drain port is provided at the bottom of the heat exchanger; the invention can greatly reduce the land area occupied by compost, reduce the use of litter and secondary pollution, and at the same time shorten the heating time and accelerate the composting process. Reduce energy consumption and reduce costs.

Description

An energy-saving and fast composting device for livestock and poultry manure and its application

technical field

The application relates to the field of agricultural environment management, in particular to an energy-saving and fast composting device for livestock and poultry manure and its application.

Background technique

According to statistics, the proportion of the total output value of animal husbandry in the total agricultural output value has increased from 14.96% in 1978 to 31.70% in 2011. While the large-scale development of farms has also brought about a rapid increase in the production of livestock and poultry manure, it is estimated that the production of livestock and poultry manure in my country has exceeded 1.4 billion tons in 1980, and reached 3.527 billion tons in 2014. It will further increase rapidly with the increase of livestock and poultry breeding. It is estimated that the total amount of livestock and poultry manure in China will reach 4.24 billion tons by 2020. At the same time, the first national non-point source pollution source survey showed that the nitrogen, phosphorus and COD emissions from the aquaculture industry accounted for 40%, 50% and 60% of the total non-point source emissions, which shows that the manure emissions from the aquaculture industry have already Become the largest source of agricultural non-point source pollution.

In order to reduce the environmental pollution risk caused by farming manure, since the 1990s, the breeding supervisors and environmental protection departments have requested to change the way of manure collection, changing the water flushing circle to dry manure, so as to reduce the amount of sewage produced, and the collected The feces are processed through composting to achieve harmless, bagged and fertilized. However, in recent years, with the increase of labor costs and technological progress, many farms, especially pig farms or cattle farms, have gradually abandoned the manual dry manure cleaning method, and replaced it with manure leaking board + mechanical manure scraping or direct mechanical manure scraping. To improve the collection efficiency, the collected feces are mixed with feces and urine. The collected mixture generally has a water content of about 80%, and it is difficult to separate the solid from the liquid. The amount of water is too high to be done with conventional composting techniques.

Similarly, in agricultural production, with the concentration of vegetable production areas and the intensive picking of vegetables, a large amount of vegetable residues with high water content will be produced, and it is difficult to compost directly with ordinary composting methods.

In recent years, an outdoor fermentation bed composting technology has been developed from the deep bedding technology, which relies on a large amount of bedding to adjust the water content of manure and carry out aerobic composting. This method has low investment costs, is easy to operate, and is easy to promote, but there are also It occupies a large area, requires a lot of bedding materials, and is easy to cause secondary pollution, such as ammonia emissions.

General high-temperature compost It is required that the moisture content of the material should not exceed 65%, preferably 45-60%. For high-humidity materials, conventional composting methods need to add dry or low-moisture organic materials as conditioners to adjust the final moisture content to Below 65%, this not only requires a large amount of conditioner, increases the amount of composting materials, increases investment, but also increases the cost of fertilizer production due to the addition of a large amount of conditioner, which makes high-humidity materials adopt high-temperature composting, which is not only costly but also difficult to source from the conditioner , which is difficult to operate in practice.

The silo-type composting reactor system is a new type of closed composting reactor developed in recent years. It is a vertical structure with a stirring system, an aeration system and an odor treatment device. The uniformly mixed materials are transported to the fermentation bin by the feeding hopper every day, and the stirring device mixes the newly added compost raw materials in the upper part of the bin. The ventilation system blows air from the bottom of the silo into the composting material, and the odor generated during the composting process is uniformly collected and processed at the upper part of the silo. The composting cycle of this reactor is 10 days. It has many advantages such as small footprint, fast fermentation temperature rise, short fermentation cycle, high degree of mechanization and automation, large amount of waste treatment, and centralized treatment of odor.

China National Agricultural University Hou Chao et al. (Document: Effect of different ventilation rates of silo-type composting reactor on composting effect, Journal of Environmental Engineering 2017, 11(8): 4737-4742), designed a silo-type composting reactor, and carried out The moisture content is 70% chicken manure composting test, the results show that by adjusting the reasonable ventilation, rapid fermentation can be achieved. Wang Xumei, Beijing Normal University, et al. (Document: Research on water and gas in warehouse-type static continuous aerobic composting fermentation process, Journal of Harbin Institute of Technology 2009 41 (11): 288-292), adopted warehouse-type static continuous aerobic composting fermentation process, established The water balance system systematically studies the influence of water on the entire fermentation process, and draws the conclusion that the warehouse-type static continuous aerobic composting fermentation has the characteristics of simple process, fast heat exchange, and large water vapor evaporation; the aerobic composting fermentation process The medium fermentation temperature is kept at about 65 ℃, and the water content is controlled at 45-55%, which is conducive to the degradation of organic matter, and the waste compost can be decomposed in 40-50 days. However, after further analysis, it can still be found that the existing silo-type composting device has defects such as long composting time and high energy consumption (compared with other composting technologies, it not only requires stirring, but also forced ventilation and additional electric heating).

The Chinese patent with the publication number CN206767951U discloses a solar domestic waste composting treatment device. The outer wall of the compost bin is provided with two layers, the inner bin is a compost bin, and a thermal fluid is filled between the outer bin and the inner bin of the compost bin. The pipeline is connected with the solar heating device, and an electric heater is installed to heat the thermal fluid. The outer warehouse of the compost bin is wrapped with a layer of heat insulation material. This method combines solar energy and electric energy to increase the material fermentation temperature and speed up fermentation. Process; the Chinese patent with the publication number CN205295180U discloses a composting fermentation device. In order to increase the fermentation temperature in winter, the device uses a blower to bring the heat generated by the furnace into the fermentation chamber to ensure the fermentation temperature and prolong the fermentation cycle; The Chinese patent with the publication number CN205061908U discloses an aerobic composting device. The device is designed with a support mechanism at the bottom of the reaction chamber. The upper end of the stirring mechanism is connected to the reaction chamber, and the bottom end is movably connected to the support mechanism. A filter mechanism is arranged under the support mechanism. , below the filter mechanism, an oxygen supply mechanism is set and connected with the reaction chamber; the Chinese patent with the publication number CN106977241A discloses a kind of aerobic composting reactor, which is provided with a water bath jacket on the outer wall of the composting tank, and the tank is equipped with pH sensor, oxygen sensor, temperature sensor and moisture sensor, the stirring motor, water bath jacket and air inlet control mechanism are controlled by the control and monitoring module to improve composting efficiency; the publication number is CN105906396A, a solar automatic door composting pool device The patent, which mentions the installation of solar panels, uses photovoltaic power generation technology to heat the compost bin to improve the composting efficiency of the compost bin.

The above-mentioned patented technologies all use external electric heating or solar heating to increase the composting temperature and speed up the composting process, but there is also the problem of high energy consumption. Therefore, how to reduce the energy consumption in composting while solving the problem of rapid composting of high-humidity organic materials has become a technical problem to be solved urgently in this field.

Contents of the invention

In view of the above problems, the application provides an energy-saving fast composting device and composting method for livestock and poultry manure, so as to reduce energy consumption in composting. The purpose of the invention is achieved in this way:

An energy-saving and rapid composting device for livestock and poultry manure, including a vertical compost bin, a heat exchanger and a biological filter; the upper part of the vertical compost bin is connected to the conveying device, and the bottom is connected to the discharge device; The bottom of the device is connected through the exhaust gas output pipe, and the first fan is also arranged on the tail gas output pipe; the upper part of the discharge device in the vertical compost bin is provided with a ventilation pipe, and the third fan and a heat pump are arranged on the ventilation pipe in turn, and exchange heat Connected to the top of the device; there is also a condensate pipe between the heat pump and the heat exchanger; the top of the heat exchanger is connected to the biofilter through the tail gas discharge pipe, and a second fan is arranged on the tail gas discharge pipe; A stirring device is provided, and a drain is provided at the bottom of the heat exchanger.

Further, in the energy-saving and fast composting device for livestock and poultry manure provided by the present invention, the vertical composting bin refers to a cylindrical structure with a height-to-diameter ratio greater than 1 made of anti-corrosion treated steel plates welded or enamelled steel plates. A drainage pipe with a control valve is also installed at the bottom of the type compost bin to discharge the leaching water produced in the compost.

Further, in the energy-saving and rapid composting device for livestock and poultry manure provided by the present invention, the heat exchanger refers to a closed cylindrical barrel, and the surroundings of the barrel are subjected to heat preservation treatment, and a coiled pipe is installed in the barrel, and the pipe is Introduce from the bottom of the heat exchanger and lead out from the top, connect a control valve at the lowest part of the introduction pipe to discharge the condensed water in the pipe; leave an inlet and outlet on the upper and lower parts of the heat exchanger and the corresponding walls The water interface is used to connect with the water inlet and outlet of the heat pump, and the bucket is filled with clean water.

Furthermore, in the energy-saving and rapid composting device for livestock and poultry manure provided by the present invention, the heat pump refers to a device equipped with heat exchange pipes and a compressor, and a dryer is installed at the inlet of the heat pump. The hot water input into the heat pump from the heat exchanger heats the input gas through the heat exchange pipe of the heat pump, and at the same time, the compressor uses a large amount of low-temperature heat energy in the air to further heat the input gas, so that the heat pump outputs relatively stable 35-50°C and dry hot air.

Further, in the energy-saving and fast composting device for livestock and poultry manure provided by the present invention, the stirring device refers to a ribbon-type agitator whose rotational speed is adjustable and which realizes material horizontal and downward movement. The agitator consists of Made of stainless steel or anti-corrosion and wear-resistant steel, the ribbon stirrer is preferred.

The application also provides an application method of the livestock and poultry manure energy-saving and fast composting device, and the specific steps are as follows:

1) The manure discharged from livestock and poultry farms with a water content of 80-94% is first mixed with materials with a water content of less than 30% (such as organic waste such as straw or rice husks and wood chips that are air-dried and crushed to a length of 5 cm, or decomposed compost, etc.), adjust the water content of the mixed material to 70-75%, and input it from the upper part of the vertical compost bin to the vertical compost bin through the feeding device, and the material passes through the stirring device from top to bottom inside the vertical compost bin. The material is discharged from the discharge device, which completes the process of material harmlessness and material dehydration to a water content below 50%.

2) The tail gas with water vapor produced by the compost in the vertical compost bin is input from the top of the three-dimensional compost bin to the bottom of the heat exchanger along the tail gas output pipe through the first fan, and the heat in the compost tail gas is exchanged to the water body in the heat exchanger , to heat the water body to form warm water. After the tail gas is exchanged by the heat exchanger, the temperature drops, and the condensed water formed is discharged from the bottom of the heat exchanger, and the gas is input from the top of the heat exchanger through the second fan along the tail gas discharge pipe to the biological filter for further processing. Deodorization treatment;

3) The warm water formed in the heat exchanger passes through the heat pump (the heat pump is also a kind of heat exchanger, which exchanges the heat in the warm water into the air to form hot air, and the hot air enters the vertical compost bin through the third fan along the ventilation duct to Complement the heat required for the evaporation of compost materials and the oxygen required for composting, and the cold water formed after being exchanged by the heat pump is then circulated to the water body of the heat exchanger through the condensate pipe, and the metabolic heat generated by the biodegradation of compost materials and the heat of compost tail gas Recycling and heat pump work to produce heat to keep the compost bin at 50-65°C. After 5-7 days of high-temperature composting, the material can be quickly dehydrated and dried, and it can meet the "Technical Specifications for Harmless Treatment of Livestock and Poultry Manure" (NY/T1168 -2006) The harmless indicators required by the standard.

In the present invention, the water content of the mixed material in step 1) is set to 70%-75% higher than that of conventional compost materials (less than 65%), because external heating is used, and the fermentation heat recycling method is used at the same time, which can speed up dehydration The way of drying, stirring and forced ventilation reduces the obstacle of poor ventilation caused by the high moisture content of the material. In actual operation, different water contents are mainly designed according to the physical properties of the material. For example, chicken and pig manure are easy to use 70% water content due to the small particle size of the material, while dairy cow manure has coarse particles and is easy to stir and ventilate. Therefore, materials with a moisture content higher than 70% can be used to reduce the amount of conditioner used and improve the utilization efficiency of the compost bin.

In addition, this patent is also applicable to other high-humidity organic material composting or other container composting methods.

Compared with similar technologies, the technical overall performance index of the present invention has the advantages that compared with the outdoor fermentation bed composting method, it can greatly reduce the land area occupied by composting, reduce the amount of litter used, and reduce secondary pollution, and realize fast and controllable composting. Composting: Compared with ordinary silo-type composting, the use of external heating can shorten the heating time and accelerate the composting process. If the same drying effect is achieved, energy consumption and costs can be reduced.

Description of drawings

Fig. 1 is a schematic diagram of an energy-saving and rapid composting device for livestock and poultry breeding manure according to an embodiment.

Among them: 1. Vertical compost bin; 2. Heat exchanger; 3. Biological filter; 4. Feeding device; 5. Discharging device; 6. Tail gas output pipe; 7. First fan; 8. Ventilation pipe; 9. The third fan; 10. Heat pump; 11. Exhaust gas discharge pipe; 12. Second fan; 13. Stirring device; 14. Drain outlet; 15. Condensed water pipe.

Detailed ways

The devices involved in the embodiments are all commercially available products, wherein:

Heat exchanger manufacturer: Jingjiang Hongneng Air Conditioning Equipment Co., Ltd.;

Heat pump: Dezhou Ruishen Air Conditioning Equipment Co., Ltd.;

Ribbon mixer: Wuxi Xinqiang Mixing Equipment Co., Ltd.;

Biological filter: Shandong Luquan Environmental Protection Technology Co., Ltd.;

Above-mentioned product enterprise production has multiple models, and device described in the present invention can select the supporting equipment of different models as required, and also can require enterprise to finalize the product as required.

Example 1

An energy-saving and rapid composting device for livestock and poultry manure, comprising a vertical compost bin 1, a heat exchanger 2 and a biofilter 3; the upper part of the vertical compost bin 1 is connected to a conveying device 4, and the bottom is connected to a discharge device 5; vertical The top of the compost bin 1 is connected to the bottom of the heat exchanger 2 through the exhaust gas output pipe 6, and the first fan 7 is also provided on the exhaust gas output pipe 6; the upper part of the discharge device 5 in the vertical compost bin 1 is provided with a ventilation duct 8, and the ventilation duct 8 is provided with a third fan 9 and a heat pump 10 in turn, and the ventilation pipe 8 is connected to the top of the heat exchanger 2; a condensate pipe 15 is also provided between the heat pump 10 and the heat exchanger 2; the top of the heat exchanger 2 is also discharged through exhaust gas The pipeline 11 is connected with the biofilter 3, and the exhaust gas discharge pipeline 11 is also provided with a second blower fan 12; the inside of the vertical compost bin 1 is provided with a stirring device 13 (a ribbon agitator is used in this embodiment), and the heat exchange The bottom of the device is provided with a drain port 14;

In this embodiment, a drainage pipe with a control valve is installed at the bottom of the vertical compost bin 1 to discharge the leached water generated in the compost.

Above-mentioned device compost application method is as follows:

1. For a pig farm with a stock of 500 pigs, discharge 3 tons of manure with a water content of about 80% per day, add 0.75 tons of decomposed compost with a water content of 30%, and adjust the water content to about 70% (in specific applications, it can be adjusted Moisture content is 70-75%); the feeding device 4 is input from the upper part of the vertical compost bin 1 to the vertical compost bin 1, and the material passes through the stirring device 13 from top to bottom inside the vertical compost bin, and is discharged by the discharge device 5 The discharge of the material means that the harmless treatment of the material is completed, and the material is dehydrated to a water content below 50%.

The decomposed compost used in this example starts 10 days ago. It is a decomposed material formed by composting pig manure obtained by drying and cleaning the manure in advance. The specific preparation method is that the pig manure obtained by drying and cleaning the manure is dried in the sun for 1-2 Every day, the water content of pig manure is reduced from about 75% to less than 65%. The strip-stack composting method is adopted, with a height of 1.5 meters, high-temperature composting for 20 days, and manual turning once every week. 3.0 meters, static post-ripening composting for 30 days, the obtained decomposed composting material with a moisture content of about 30%.

Example 10 days later, use the materials fermented and produced by the vertical composting device, and then statically compost to form decomposed compost with a water content of about 30%.

In the specific implementation process, it is also possible to use decomposed compost obtained in other conventional ways, or air-dried and crushed organic waste such as straw or rice husks, wood chips, etc. to a length of 5 cm to adjust the moisture content of the mixed material.

The tail gas with water vapor produced during the composting process in the vertical compost bin 1 is input from the top of the three-dimensional compost bin 1 to the bottom of the heat exchanger 2 through the first fan 7 along the tail gas output pipe 6, and the heat in the compost tail gas is exchanged to the heat exchanger In the water body in 2, the water body is heated to form warm water; after the tail gas is exchanged by the heat exchanger 2, the temperature decreases, and the formed condensed water is discharged from the drain port 14 at the bottom of the heat exchanger 2, and the gas is passed through the second fan from the top of the heat exchanger 12 is input to the biological filter 3 along the tail gas discharge pipeline 11 for deodorization treatment.

2. The warm water formed in the heat exchanger 2, through the heat pump 10, exchanges the heat in the warm water into the air to form hot air, and the hot air enters the vertical compost bin 1 through the third fan 9 along the ventilation duct 8 to supplement the moisture content of the compost material The heat required for evaporation and the oxygen required for composting, the cold water exchanged by the heat pump 10 is then circulated to the water body of the heat exchanger 2 through the condensed water pipeline 15, and the metabolic heat generated by the biodegradation of the compost material and the heat recovery of the compost tail gas and the heat pump Work to produce heat to keep the compost bin at 50-65°C, and compost at high temperature for 5-7 days to achieve rapid dehydration and drying of materials.

In this embodiment, the vertical compost bin 1 is assembled with enamel steel plates to form a tank with a diameter of 4m, a tank height of 4.5m, and a total volume of 56.5m ³ ; the power of the heat pump 10 is 10kw, and the air supply volume is 800m ³ /h; the volume of the heat exchanger 2 is 2m ³ ; The feeding device 4 is a lifting bucket feeding material, after the mixed material enters the fermentation bin, after 5 days of fermentation, the temperature of the upper layer reaches 70°C, the temperature of the middle layer is 65°C, the temperature of the discharge is 50°C, and the water content is 48 %, discharged through the discharge device 5. After testing, the discharged material reaches the harmless index required by the "Technical Specifications for Harmless Treatment of Livestock and Poultry Manure" (NY/T1168-2006).

The heat pump 10 is continuously turned on during the composting process. According to the heat required to be supplemented and the ambient temperature, the actual consumption function fluctuates between 2-8kw, and the biofilter 3 continues to run; the device in this embodiment runs continuously for 20 days, and the daily evaporation water is 1.86 tons. The electricity consumption is 120kwh, and the heat exchanger 2 and the heat pump 10 are used to evaporate the heat energy. The final electric energy conversion efficiency reaches 1:4~5, which reduces energy consumption by more than 30% compared with general silo-type composting.

Among them, the calculation method of electric energy conversion efficiency in this application can be found in the following literature: Zhang Huajun, Chen Wei, Li Yong. Research and Development Prospects of Air Source Heat Pump Water Heater, Special Topic of Air Source Heat Pump Water Heater [M]. 2007, China Construction Information Heating and Refrigeration; or , Fan Pingping, Duanmu Lin, Wang Xuelong and so on. The development and research status of ground source heat pump[J]. Gas and Heat, 2005, 25(10): 66~70; and, Tao Siyuan’s research on solar-assisted air source heat pump supply system for biogas digester heating, master’s thesis, Tongji University, 2013.

The energy consumption of general silo-type composting can be found in literature: Hou Chao, Li Yongbin, etc. Effect of different ventilation rates on the composting effect of silo-type composting reactors, Journal of Environmental Engineering 2017, 11 (8): 4737-4742; and, Wang Xumei, Wei Zimin , Wang Shiping's research on the water vapor of static continuous aerobic composting fermentation process, Journal of Harbin Institute of Technology 2009 41 (11): 288-292.

Example 2

A dairy farm with a stock of 200 cows in a certain place adopts the method of manual manure removal. The water content of the manure is about 84%, and the daily output is about 5000 kg.

In this embodiment, the vertical compost bin 1 is assembled with enamel steel plates to form a tank with a diameter of 4.6m, a tank height of 5.0m, and a total volume of 83m ³ ; the power of the heat pump 10 is 10kw, and the air supply volume is 900m ³ /h; the volume of the heat exchanger 2 is 2m ³ ; Feeding device 4 is a lifting bucket feeding, and other settings are the same as in Embodiment 1.

In the present embodiment, except following part, composting method is also identical with embodiment 1:

In the first 10 days after the start of composting, add 750 kg of air-dried (moisture content 15%) and crushed straw to a length of about 5 cm, mix to form a material with a water content of about 75%, and then enter the vertical compost bin through the feeding device. Carry out high-temperature fermentation, and 10 days after the start of composting, use conventionally fermented and decomposed cow manure with a water content of about 30% as a conditioner for regulating water, and the addition amount is 1,000 kg.

After running for 20d, the parameters of this embodiment are as follows:

After the mixed material enters the fermentation bin, after 5 days of fermentation, the temperature of the upper layer reaches 75°C, the temperature of the middle layer reaches 65°C, the temperature of the material is 55°C, and the water content is 46%. It is discharged through the discharge device. After testing, the discharge Reach the harmless indicators required by the "Technical Specifications for Harmless Treatment of Livestock and Poultry Manure" (NY/T1168-2006).

It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (6)

1. a kind of energy saving Quick composting device of livestock and poultry feces, including vertical in-vessel composting system, which is characterized in that the composting device further includes Heat exchanger and biofilter；Vertical in-vessel composting system top is connect with conveying device, and bottom is connect with drawing mechanism；Vertical in-vessel composting system Top is connect with heat exchanger bottom by tail gas output channel, and the first wind turbine is additionally provided on tail gas output channel；Vertical compost The top of drawing mechanism is equipped with ventilation shaft in storehouse, is equipped with third wind turbine and heat pump, and and heat exchanger on ventilation shaft successively Top is connected；Condensing water conduit is additionally provided between heat pump and heat exchanger；Pass through exhaust emission pipeline and life at the top of heat exchanger Object filter tank connects, and exhaust emission pipeline is equipped with the second wind turbine；The vertical in-vessel composting system inner upper is equipped with agitating device, and heat is handed over Parallel operation bottom is equipped with discharge outlet.

2. the energy saving Quick composting device of livestock and poultry feces according to claim 1, which is characterized in that the agitating device is ribbon Formula blender.

3. the energy saving Quick composting device of livestock and poultry feces according to claim 1, which is characterized in that the vertical in-vessel composting system is height Diameter than be more than 1 cylindrical structure, vertical in-vessel composting system bottom is also equipped with the drainage pipeline with control valve.

4. a kind of compost method using the energy saving Quick composting device of one of the claim 1-3 livestock and poultry feces, specific to walk It is rapid as follows：

1) waste that will be discharged by livestock and poultry farm mixes with material of the water content less than 30%, adjusts material water ratio after mixing It is 70~75%；Then vertical in-vessel composting system is input to by vertical in-vessel composting system top through feed arrangement, material is inside vertical in-vessel composting system On from lower by agitating device, by 5~7 days 50~65 DEG C of compost and the tail gas with water vapour that generates, finally by going out Expect device discharge；

2) step 1）The tail gas with water vapour of middle generation is by three-dimensional compost the top of the warehouse through the first wind turbine along tail gas output channel It is input to heat exchanger bottom, heat, which is switched in the water body in heat exchanger, in composting tail gas forms warm water；Composting tail gas After heat exchanger exchanges, form condensed water and discharged from heat exchanger bottom discharge mouth, gas then by the top of heat exchanger through the Two wind turbines are input to biofilter along exhaust emission pipeline；

3) step 2）In the warm water that is formed in a heat exchanger, hot wind will be formed in heat exchange to air in warm water through heat pump, Hot wind is passed through vertical in-vessel composting system by third wind turbine along ventilation shaft, and cold water is formed after being exchanged by heat pump and passes through condensing water conduit again It is recycled in the water body of heat exchanger, to keep maintaining 50~65 DEG C in in-vessel composting system.

5. according to the method described in claim 4, it is characterized in that, material of the water content less than 30% refers to：Air-dry simultaneously powder It is broken to one or more in the stalk, rice husk, sawdust of 5cm length；Or matured compost.

6. according to the method described in claim 4, it is characterized in that, the heat pump exports 35~50 DEG C of dry hot winds.