NL2034351B1 - Aerobic composting system - Google Patents
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- NL2034351B1 NL2034351B1 NL2034351A NL2034351A NL2034351B1 NL 2034351 B1 NL2034351 B1 NL 2034351B1 NL 2034351 A NL2034351 A NL 2034351A NL 2034351 A NL2034351 A NL 2034351A NL 2034351 B1 NL2034351 B1 NL 2034351B1
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- 238000009264 composting Methods 0.000 title claims abstract description 148
- 238000006243 chemical reaction Methods 0.000 claims abstract description 296
- 230000007423 decrease Effects 0.000 claims abstract description 17
- 238000004146 energy storage Methods 0.000 claims description 76
- 239000000463 material Substances 0.000 claims description 66
- 238000012546 transfer Methods 0.000 claims description 60
- 230000007246 mechanism Effects 0.000 claims description 38
- 238000001514 detection method Methods 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 36
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- 238000010438 heat treatment Methods 0.000 claims description 30
- 241001148470 aerobic bacillus Species 0.000 claims description 25
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- 238000009423 ventilation Methods 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 11
- 229910052760 oxygen Inorganic materials 0.000 claims description 11
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- 239000013529 heat transfer fluid Substances 0.000 claims 2
- 206010037660 Pyrexia Diseases 0.000 claims 1
- 238000005273 aeration Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 22
- 239000002361 compost Substances 0.000 abstract description 18
- 244000005700 microbiome Species 0.000 abstract description 17
- 230000001965 increasing effect Effects 0.000 abstract description 11
- 238000002161 passivation Methods 0.000 abstract description 7
- 239000002699 waste material Substances 0.000 abstract description 7
- 239000002910 solid waste Substances 0.000 abstract description 5
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- 230000001276 controlling effect Effects 0.000 description 22
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000000855 fermentation Methods 0.000 description 4
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- 229910052757 nitrogen Inorganic materials 0.000 description 3
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
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- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
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- 239000010806 kitchen waste Substances 0.000 description 1
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- 239000010871 livestock manure Substances 0.000 description 1
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- 239000010902 straw Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
- C05F17/60—Heating or cooling during the treatment
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
- C05F17/20—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation using specific microorganisms or substances, e.g. enzymes, for activating or stimulating the treatment
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
- C05F17/70—Controlling the treatment in response to process parameters
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
- C05F17/90—Apparatus therefor
- C05F17/964—Constructional parts, e.g. floors, covers or doors
- C05F17/971—Constructional parts, e.g. floors, covers or doors for feeding or discharging materials to be treated; for feeding or discharging other material
- C05F17/986—Constructional parts, e.g. floors, covers or doors for feeding or discharging materials to be treated; for feeding or discharging other material the other material being liquid
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
- C05F17/90—Apparatus therefor
- C05F17/993—Arrangements for measuring process parameters, e.g. temperature, pressure or humidity
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Biotechnology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Microbiology (AREA)
- Molecular Biology (AREA)
- Organic Chemistry (AREA)
- Tropical Medicine & Parasitology (AREA)
- Fertilizers (AREA)
Abstract
The present invention is applicable to the technical field of aerobic composting, and provides 5 an aerobic composting system. According to the present invention, on one hand, heat energy generated in the high temperature stage, the temperature decrease stage and the composting stage is effectively utilized through the heat exchange device, and meanwhile, a circumstance that the temperature in the reaction containers in the high temperature stage rapidly reaches the highest temperature to cause passivation of activity of certain microorganisms, waste of heat 10 energy, and long composting period can be avoided, and then the reaction rate is relatively increased, and the reaction period is shortened; and on the other hand, aerobic compost in the temperature increase stage is heated through the heat exchange device, so that the reaction rate can be increased, the reaction period can be shortened, organic solid waste can be continuously and stably treated.
Description
AEROBIC COMPOSTING SYSTEM
The present invention belongs to the technical field of aerobic composting, and particularly relates to an aerobic composting system.
With the deep understanding of people on environmental problems and the higher-level demand for sustainable development, the recycling of solid organic waste resources in villages and towns continues to receive widespread attention. A modern aerobic composting process generally has the characteristics of high compost temperature, relatively thorough matrix decomposition, short composting period and small odour of composting exhaust gas, and is an effective way for disposing organic household garbage in villages and towns and rural toilet faeces and realizing resource utilization. Through reasonable proportioning and process control of multi-source organic garbage in villages and towns, high-quality organic fertilizers can be produced, the dependence of agriculture on chemical fertilizers is reduced, sail is improved to a certain extent, fertility is cultivated, and the sustainable development of cultivated land is realized; and meanwhile, the living environment of villages and towns can be improved, and the strategy of revitalizing villages and towns in China can be realized.
Generally, aerobic composting may realize reduction, recycling and harmless treatment and utilization of organic solid waste resources. Aerobic composting is an extremely complex physical and chemical change process, and can be roughly divided into four stages according to the change processes of growth, metabolism, reproduction, death, population alternation and the like of microorganisms: a temperature increase stage, a high temperature stage, a temperature decrease stage and a composting and drying stage. The temperature directly influences the activities of the microorganisms and the composition and quantity of populations, and further influences the decomposition rate and humification process of organic matters. In the composting process, the temperature increases first and then decreases; the first stage is a temperature increase and medium temperature stage, heat is released along with continuous decomposition of the microorganisms on the organic matters after composting is started, and the composting temperature is increased from the ambient temperature to 45°C and continuously increased to be 60°C; the second stage is the high temperature stage, the activities of thermal microorganisms and the decomposition of the organic matters are further enhanced, the composting temperature is increased to be 60-65°C and even can be up to 80°C, and most of the organic matters are decomposed in this stage, so this stage is the main object for temperature control in the composting process; and the third stage is a temperature decrease and cooling stage, the activities of the microorganisms are slowed down along with the decomposition of most of the organic matters, and the composting temperature is decreased and enters the after-composting and cooling stage to return to the ambient temperature again. In the high temperature stage, the activities of certain microorganisms will be passivated due to overhigh temperature, and thus the composting efficiency is reduced; and when municipal refuse compost is at 60-65°C, the CO: generation amount is maximum, the decomposition rate of the organic matters is the highest, and pathogenic bacteria can be killed at the continuous high temperature of 80°C in the composting process of the organic solid waste, and as a result, harmlessness is realized.
At present, common composting processes can be divided into an open composting process and a closed composting process. The open composting process mainly includes a static composting process, a windrow composting process, etc.; the open composting process simple and feasible, low in investment cost and convenient to operate and maintain, but has poor composting quality, long fermentation period and difficulty in controlling composting odour and leachate, and is not used gradually at present. The closed composting process includes a trough composting process, and is generally implemented through a closed greenhouse covering facility, which is beneficial for the temperature maintenance of a compost body and collection and treatment of composting exhaust gas; and meanwhile, the closed composting process also reduces the dependence of the composting process on climatic conditions to a certain extent. However, the closed composting process needs large floor area and long composting time, and cannot realize continuous feeding under general conditions.
The applicant of the present invention finds from implementing of the abovementioned technical solutions that the technical solutions at least has the following defects: the open composting process and the trough composting process are generally subjected to intermittent production, and comprehensive utilization of heat in each aerobic composting reaction stage cannot be realized, so the period of the composting temperature increase stage is long, the growth, metabolism and reproduction of the microorganisms are slow, and the highest temperature is quickly reached in the high temperature stage, then the activities of certain microorganisms will be passivated, and composting efficiency will be reduced, and as a result, the circumstances of heat energy waste, long composting period and the like will be caused. Therefore, an aerobic composting system is provided to solve these problems.
Summary of the Present Invention
An embodiment of the present invention aims to provide an aerobic composting system to solve the problems mentioned in the Background Art.
The embodiment of the present invention is implemented as follows: an aerobic composting system includes at least two reaction containers, a heat exchange device and a control system; reaction containers: the reaction containers are filled with aerobic bacteria and are used for storing materials and performing aerobic composting treatment on the materials; the aerobic composting reaction stages are sequentially a temperature increase stage, a high temperature stage, a temperature decrease stage and a composting stage; the reaction stages of different reaction containers are different, and the corresponding reaction temperatures are different; heat exchange device: the heat exchange device is arranged on the reaction containers, is filled with a heat transfer medium and is used for acquiring and storing heat energy released in the aerobic composting process of the materials in the reaction containers in the high temperature stage, the temperature decrease stage and the composting stage and heating the reaction containers in the temperature increase stage; and control system: the control system is arranged on the heat exchange device and is used for controlling the circulation direction and heat transfer direction of the heat transfer medium in the heat exchange device according to the aerobic composting reaction stages in different reaction containers.
Preferably, the heat exchange device comprises a first energy storage container, a second energy storage container, a first circulating pipeline, a second circulating pipeline, a third circulating pipeline and a liquid circulating heating and cooling device; the reaction containers comprise the first reaction container and the second reaction container, and the aerobic composting reaction stages of materials in the first reaction container and the second reaction container are different; the control system comprises a control module, a first electric flow pump, a second electric flow pump and a third electric flow pump; the first energy storage container and the second energy storage container are used for storing the heat transfer medium; the liquid circulating heating and cooling devices electrically connected with the control system are arranged in the first energy storage container and the second energy storage container, and the liquid circulating heating and cooling devices are used for being matched with the control system to heat or refrigerate the heat transfer media in the first energy storage container and the second energy storage container; the first circulating pipeline is arranged on each first reaction container and forms a circulating channel with an inflow port and an outflow port of the first energy storage container, the second circulating pipeline is arranged on each first reaction container and forms a circulating channel with an inflow port and an outflow port of the second energy storage container; the third circulating pipeline is arranged on each second reaction container and forms a circulating channel with an inflow port and an outflow port of the first energy storage container, the first electric flow pump is arranged in the first circulating pipeline, electrically connected with the control module and used for controlling flowing of the heat transfer medium in the first circulating pipeline;
the second electric flow pump is arranged in the second circulating pipeline, electrically connected with the control module and used for controlling flowing of the heat transfer medium in the second circulating pipeline; and the third electric flow pump is arranged in the third circulating pipeline, electrically connected with the control module and used for controlling flowing of the heat transfer medium in the third circulating pipeline.
Preferably, dividing wall type heat exchange is adopted for heat exchange of a first circulating pipeline, a second recirculating pipeline and a third recirculating pipeline relative to the first reaction container and the second reaction container respectively; each of the first circulating pipeline, the second circulating pipeline and the third circulating pipeline includes an in-cylinder heat exchanger and an out-cylinder heat exchanger; each in-cylinder heat exchanger is a heat exchange coil or a central main pipe heat exchanger provided with a circulating branch pipe; each central main pipe is of a hollow circular pipe structure, and each circulating branch pipe is of a hollow plate structure; and the length of each circulating branch pipe is 4 - %4 of the inner diameter of a sealed reaction bin.
Preferably, outer surfaces of the first circulating pipeline, the second circulating pipeline and the third circulating pipeline are provided with first heat preservation layers; and the first heat preservation layers are made of a light heat preservation material having the thickness of 30- 100 mm and the heat conductivity coefficient of less than 0.04 kJ/(m-h-°C).
Preferably, the first reaction container and the second reaction container are both arranged obliquely relative to the horizontal plane, and the inclination angle is 0.1 - 1°.
In a preferred embodiment, each of the first reaction container and the second reaction container of the aerobic composting system of the invention is provided with: a spraying mechanism which is used for spraying water into the first reaction container or the second reaction container; a ventilation mechanism which is used for ventilating the first reaction container or the second reaction container; an aerobic bacteria agent spraying mechanism which is used for supplying aerobic bacteria to the first reaction container or the second reaction container; at least one or more of the following detection devices, the detection devices comprising: an oxygen content detection device which is used for detecting the oxygen content in the first reaction container or the second reaction container; a humidity detection device which is used for detecting the humidity in the first reaction container or the second reaction container; a temperature detection device which is used for detecting the temperature in the first reaction container or the second reaction container; and a PH detection device which is used for detecting the PH value in the first reaction container or the second reaction container;
the detection device is electrically connected with the control system, and the detection result of the detection device is fed back to the control system; and the control system is used for controlling the operation of the spraying mechanism, the ventilation mechanism and the aerobic bacteria agent spraying mechanism according to the feedback result. 5 Preferably, the first reaction container and the second reaction container are both sealed reaction bins in a form of a rotary kiln structure; each sealed reaction bin comprises a kiln body, a kiln head and a kiln tail; the kiln head and the kiln tail are respectively arranged at two ends of the kiln body, and the kiln body is provided with a driving assembly; the driving assembly is used for driving the kiln body to rotate relative to the kiln head and the kiln tail.
Preferably, second heat preservation layers are arranged on the outer surfaces of the first reaction container and the second reactor; the second heat preservation layers are made of a light heat preservation material having the thickness of 50-200 mm and the heat conductivity coefficient of less than 0.04 kJ/(m-h-°C).
Compared with the prior art, the technical solution has the advantages that by improving a traditional aerobic composting technology, the at least two reaction containers are provided for performing aerobic composting treatment processes in different stages, that is, the control system is used for controlling the circulating direction of a heat transfer medium in the heat exchange device, so that heat in the reaction containers in a high temperature stage, a temperature decrease stage and a composting stage is absorbed and obtained, and as a result, a circumstance that the temperature in the reaction containers in the high temperature stage rapidly reaches the highest temperature to cause passivation of activity of certain microorganisms, reduction of composting efficiency, waste of heat energy, and long composting period can be avoided; the control system is used for controlling the high-temperature heat transfer medium subjected to heat exchange in the heat exchange device to heat the reaction containers in the heating stage, thus compost in temperature increase stage in the reaction containers is accelerated to increase the temperature, and meanwhile, the microorganisms are promoted to quickly grow, metabolize and reproduce, and as a result, comprehensive utilization of heat in different reaction stages of the aerobic composting system is further improved, and the effects of recycling and comprehensively utilizing heat energy in each aerobic composting reaction stage and shortening the composting period are achieved.
FIG. 1 is a structural diagram of an aerobic composting system according to the present invention;
FIG. 2 is a process flowchart of compost circulating preparation of an aerobic composting system according to the present invention;
FIG. 3 is a structural diagram of reaction containers according to the present invention.
FIG. 4 is an A-A profile chart of FIG. 3;
FIG. 5 is a B-B profile chart of FIG. 3;
FIG. 6 is a front view of an in-cylinder heat exchanger according to an Embodiment 1 of the present invention;
FIG. 7 is a structural schematic diagram of a second heat preservation layer and reaction containers according to an Embodiment 1 of the present invention; and
FIG. 8 is a structural right view of a second heat preservation layer and reaction containers according to an Embodiment 1 of the present invention.
In drawings: 1, reaction container; 110, first reaction container; 120, second reaction container; 2, heat exchange device; 21, first energy storage container; 22, second energy storage container; 23, first circulating pipeline; 24, second circulating pipeline; 25, third circulating pipeline; 28, liquid circulating heating and cooling device; 3, control system; 31, control module; 32, first electric flow pump; 33, second electric flow pump; 34, third electric flow pump; 101, spraying mechanism; 102, ventilation mechanism; 103, aerobic bacteria agent spraying mechanism; 130, detection device; 10, kiln body; 11, kiln head; 12, kiln tail; 104, roller support; 10b, rotary kiln wheel belt; 10c, speed regulating motor; 10d, first gear; 10e, second gear; 11a, gas outlet; 11b, feed inlet; 11c, liquid injection pipe; 12a, discharge port; 12b, gas inlet; 295, central main pipe; 320, circulating branch pipe; 500, first heat preservation layer; and 600, second heat preservation layer.
Detailed Description of the Present Invention
In order to make the purpose, technical scheme and advantages of the present invention more clear, the present invention will be further described in detail with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and not to limit the present invention.
The specific implementation of the present invention will be described in detail in combination with specific embodiments.
Embodiment 1
As shown in figures 1 to 9, an embodiment of the present invention provides an aerobic composting system, including at least two reaction containers 1, a heat exchange device 2 and a control system 3; reaction containers 1: the reaction containers 1 are filled with aerobic bacteria and are used for storing materials and performing aerobic composting treatment on the materials; the aerobic composting reaction stages are sequentially a temperature increase stage, a high temperature stage, a temperature decrease stage and a composting stage; the reaction stages of different reaction containers 1 are different, and the corresponding reaction temperatures are different; heat exchange device 2: the heat exchange device 2 is arranged on the reaction containers 1, is filled with a heat transfer medium and is used for acquiring and storing heat energy released in the aerobic composting process of the materials in the reaction containers 1 in the high temperature stage, the temperature decrease stage and the composting stage and heating the reaction containers 1 in the temperature increase stage; and control system 3: the control system is arranged on the heat exchange device 2 and is used for controlling the circulation direction and heat transfer direction of the heat transfer medium in the heat exchange device 2 according to the aerobic composting reaction stages in different reaction containers 1.
According to the embodiment of the present invention, the at least two reaction containers 1 can be divided into the first reaction container 110 and the second reaction container 120 as required in different stages of composting reaction in the reaction containers 1; materials can generate a large amount of heat energy during aerobic composting in the first reaction container 110 in the high temperature stage, the temperature decrease stage and the composting stage; and the generated heat energy is acquired by the heat exchange device 2. The acquired heat energy is transferred to the second reaction container 120 in the temperature increase stage through the heat exchange device 2, so that the period of the temperature increase stage of the materials in the second reaction container 120 is greatly shortened; meanwhile, the materials in the high temperature stage in the first reaction container 110 are prevented from quickly reaching the highest temperature to cause passivation of the activity of certain microorganisms and reduction of the composting efficiency; and therefore, comprehensive utilization of the heat energy in different reaction stages in different reaction containers is realized; the aerobic composting treatment period of the materials is shortened.
In the embodiment, the second composting reaction container 120 and the first reaction container 110 can be sealed reaction containers.
Compared with the prior art, the embodiment of the present invention has the advantages that by improving a traditional aerobic composting technology, the at least two reaction containers 1 are provided for respectively performing aerobic composting reaction stage processes in different time periods, that is, absorbing the heat in the high temperature stage,
the temperature decrease stage and the composting and drying stage with severe biochemical reaction and heating the aerobic compost in the temperature increase stage are respectively performed in the two sealed reaction containers 1; on one hand, the heat energy produced in the high temperature stage, the temperature decrease stage and the composting stage can be effectively utilized by the heat exchange device 2, and meanwhile, a circumstance that the temperature in the reaction container 1 in the high temperature stage rapidly reaches the highest temperature to cause passivation of activity of certain microorganisms, reduction of composting efficiency, waste of heat energy, and long composting period can be avoided, and then the reaction rate is relatively increased, and the reaction period is shortened; and on the other hand, aerobic compost in the temperature increase stage is heated through the heat exchange device 2, so that the reaction rate can be increased, the reaction period can be shortened, organic solid waste can be continuously and stably treated, and the composting process can be continuously carried out.
As shown in figure 1, as a preferred embodiment of the present invention, the heat exchange device 2 includes: a first energy storage container 21, a second energy storage container 22, a first circulating pipeline 23, a second circulating pipeline 24, a third circulating pipeline 25 and a liquid circulating heating and cooling device 26; the reaction container 1 includes the first reaction container 110 and the second reaction container 120, and the aerobic composting reaction stages of materials in the first reaction container 110 and the second reaction container 120 are different; the control system 3 includes a control module 31, a first electric flow pump 32, a second electric flow pump 33 and a third electric flow pump 34; the first energy storage container 21 and the second energy storage container 22 are used for storing a heat transfer medium. The heat transfer medium in the embodiment can be selected from gas (such as air, nitrogen, chlorine, carbon dioxide and other gases) or liquid (such as water, heavy oil, crude oil, lubricating oil or heat transfer oil and other liquids); and for economy, water is generally selected as the heat transfer medium; the liquid circulating heating and cooling devices 26 electrically connected with the control system 3 are arranged in the first energy storage container 21 and the second energy storage container 22, and the liquid circulating heating and cooling devices 26 are used for being matched with the control system 3 to heat or refrigerate the heat transfer media in the first energy storage container 21 and the second energy storage container 22; the first circulating pipeline 23 is arranged on each first reaction container 110 and forms a circulating channel with an inflow port and an outflow port of the first energy storage container 21;
the second circulating pipeline 24 is arranged on each first reaction container 110 and forms a circulating channel with an inflow port and an outflow port of the second energy storage container 22; the third circulating pipeline 25 is arranged on each second reaction container 120 and forms a circulating channel with an inflow port and an outflow port of the first energy storage container 21; the first electric flow pump 32 is arranged in the first circulating pipeline 23, electrically connected with the control module 31 and used for controlling flowing of the heat transfer medium in the first circulating pipeline 23; the second electric flow pump 33 is arranged in the second circulating pipeline 24, electrically connected with the control module 31 and used for controlling flowing of the heat transfer medium in the second circulating pipeline 24; and the third electric flow pump 34 is arranged in the third circulating pipeline 25, electrically connected with the control module 31 and used for controlling flowing of the heat transfer medium in the third circulating pipeline 25.
Specifically, the first energy storage container 21 and the second energy storage container 22 are adopted for heat exchange and energy storage respectively, so that a high-temperature heat transfer medium and a low-temperature heat transfer medium can be simultaneously obtained in the same period, and heat exchange (heating or refrigeration) can be conveniently carried out on the first reaction container 110 or the second reaction container 120 in different aerobic composting reaction stages simultaneously; the control module 31 on the control system 3 is used for controlling the start and stop of the first electric flow pump 32, the second electric flow pump 33 or the third electric flow pump 34 respectively, so that the flow of the heat transfer media in the first circulating pipeline 23, the second circulating pipeline 24 and the third circulating pipeline 25 which communicate with the first energy storage container 21 and the second energy storage container 22 can be controlled, and as a result, the first reaction container 110 or the second reaction container 120 is automatically controlled to carry out directional and quantitative heat exchange; and finally, the liquid circulating heating and cooling devices 26 are arranged in the first energy storage container 21 and the second energy storage container 22, thus the problem that the temperature of the heat transfer media in the first energy storage container 21 and the second energy storage container 22 cannot be automatically adjusted when the heat transfer media in the first energy storage container 21 and the second energy storage container 22 cannot be supplied to the first reaction container 110 or the second reaction container 120 for accurate heat exchange can be avoided, and as a result, the reaction precision and the reaction rate of the aerobic composting system are further improved, and the reaction period is shortened.
As shown in figure 2, during use:
in a first stage, raw materials to be reacted are charged into the first reaction container 110; the control system 3 is used for controlling the liquid circulating heating and cooling device 26 to heat the heat transfer medium in the first energy storage container 21, and the temperature is increased to be 60 - 65°C; then the control module 31 on the control system 3 is used for controlling the first electric flow pump 32 to start; the first electric flow pump 32 is used for conveying the high-temperature heat transfer medium in the first energy storage container 21 into the first reaction container 110 through the first circulating pipeline 23 for heat exchange (heating), and therefore the composting materials in the first reaction container 110 is accelerated to enter the high temperature stage from the temperature increase stage so as to enter a second stage, and the reaction period is shortened preliminarily; in the second stage, the raw materials to be reacted are charged into the second reaction container 120; the raw materials are charged at intervals relative to the first reaction container 110, and composting reaction stages in different reaction containers 1 are different; the control module 31 on the control system 3 is used for controlling the second electric flow pump 33 and the third electric flow pump 34 to start, and the control system 3 is used for controlling the liquid circulating heating and cooling device 26 to stop heating the first energy storage container 21; the second electric flow pump 33 is used for conveying a low-temperature heat transfer medium in the second energy storage container 22 into the first reaction container 110 through the second circulating pipeline 24 for heat exchange (refrigeration); and the low-temperature heat transfer medium in the second energy storage container 22 is converted into high-temperature heat transfer medium for use in a third stage after heat exchange, so that a circumstance that the temperature in the first reaction container 110 in the high temperature stage rapidly reaches the highest temperature of 80°C to cause passivation of activity of certain microorganisms, reduction of composting efficiency, waste of heat energy, and long composting period can be avoided; meanwhile, the second energy storage container 22 is used for absorbing and storing the heat in the first reaction container 110 in the high temperature stage, the temperature decrease stage and the composting and drying stage, thus the heat energy is recycled, the reaction rate of composting reaction in the first reaction container 110 is further increased, and the reaction period is shortened; the third electric flow pump 34 is used for conveying the high- temperature heat transfer medium in the first energy storage container 21 into the second reaction container 120 through the third circulating pipeline 25 for heat exchange (heating), so that the composting materials in the second reaction container 120 are accelerated to quickly enter the high-temperature stage from the temperature increase stage so as to enter the third stage, and the reaction period is preliminarily shortened; the high-temperature heat transfer medium in the first energy storage container 21 is converted into the low-temperature heat transfer medium for use in the third stage after heat exchange; in the third stage, compost after reaction in the first reaction container 110 is taken out, and new compost raw materials to be reacted are charged again; the second electric flow pump 33 and the third electric flow pump 34 are controlled to start by the control module 31 on the control system 3; the second electric flow pump 33 is used for conveying the low-temperature heat transfer medium in the second energy storage container 22 into the first reaction container 110 through the second circulating pipeline 24 for heat exchange (heating); the high-temperature heat transfer medium in the second energy storage container 22 is converted into the low- temperature heat transfer medium for use in a fourth stage after heat exchange; and the third electric flow pump 34 is used for conveying the low-temperature heat transfer medium in the first energy storage container 21 into the second reaction container 120 through the third circulating pipeline 25 for heat exchange (refrigeration), and at the moment, the low- temperature heat transfer medium in the first energy storage container 21 is converted into the high-temperature heat transfer medium for use in the fourth stage after heat exchange; in the fourth stage, compost obtained after reaction in the second reaction container 120 is taken out, and new compost raw materials to be reacted are charged again; the second electric flow pump 33 and the third electric flow pump 34 are controlled to start by the control module 31 on the control system 3; the second electric flow pump 33 is used for conveying the low- temperature heat transfer medium in the second energy storage container 22 into the first reaction container 110 through the second circulating pipeline 24 for heat exchange (refrigeration); the low-temperature heat transfer medium in the second energy storage container 22 is converted into the high-temperature heat transfer medium for use in a fifth stage after heat exchange; the third electric flow pump 34 is used for conveying the high-temperature heat transfer medium in the first energy storage container 21 into the second reaction container 120 through the third circulating pipeline 25 for heat exchange (heating); and the high- temperature heat transfer medium in the first energy storage container 21 is converted into the low-temperature heat transfer medium for use in the fifth stage after heat exchange; and in the N™" stage, heat generated in the first reaction container 110 and the second reaction container 120 in different reaction stages is circularly and comprehensively utilized, so that the reaction rate is greatly increased, the reaction period is shortened, and the effects of recycling and comprehensively utilizing heat energy in each aerobic composting reaction stage and shortening the composting period are achieved.
It is to be noted that according to the technical solutions above, the first reaction container 110 and the second reaction container 120 are matched with the first energy storage container 21, the second energy storage container 22, the control module 31, the first electric flow pump 32, the second electric flow pump 33, the third electric flow pump 34, the first circulating pipeline 23, the second circulating pipeline 24 and the third circulating pipeline 25 for use, or no less than two energy storage containers and multiple groups of circulating pipelines are matched for use on a premise that the heat in the reaction containers 1 in the high temperature stage, the temperature decrease stage and the composting and drying stage can be recovered, and compost in the reaction container 1 in the heat increase stage can be heated.
As shown in figures 1 to 7, as a preferred embodiment of the present invention, dividing wall type heat exchange is adopted for heat exchange of the first circulating pipeline 23, the second circulating pipeline 24 and the third circulating pipeline 25 relative to the first reaction container 110 and the second reaction container 120 respectively; each of the first circulating pipeline 23, the second circulating pipeline 24 and the third circulating pipeline 25 includes an in-cylinder heat exchanger and an out-cylinder heat exchanger; each in-cylinder heat exchanger is a heat exchange cail or a central main pipe 295 provided with a circulating branch pipe 320; each central main pipe 295 is of a hollow circular pipe structure, and each circulating branch pipe 320 is of a hollow plate structure; the length of each circulating branch pipe 320 in the inner diameter direction of a sealed reaction bin is 1/4-1/3 of the inner diameter of the sealed reaction bin.
Specifically, as shown in figures 6 and 7, the circulating branch pipe 320 has the effect of enhancing the mixing effect of the first reaction container 110 on materials while improving the heat exchange efficiency.
As a preferred embodiment of the present invention, the first circulating pipeline 23, the second circulating pipeline 24 and the third circulating pipeline 25 are all provided with medium supplementing ports.
Specifically, the heat transfer medium can be supplemented or replaced into the first circulating pipeline 23 or the second circulating pipeline 24 or the third circulating pipeline 25 through the medium supplementing ports.
As a preferred embodiment of the present invention, outer surfaces of the first energy storage container 21, the second energy storage container 22, the first circulating pipeline 23, the second circulating pipeline 24 and the third circulating pipeline 25 are provided with first heat preservation layers 500; and the influence of the environment temperature on the first energy storage container 21, the second energy storage container 22, the first circulating pipeline 23, the second circulating pipeline 24 and the third circulating pipeline 25 can be reduced through the first heat preservation layers 500, and heat loss is avoided.
As a preferred embodiment of the present invention, the first heat preservation layers 500 are made of a light heat preservation material having the thickness of 30-100 mm and the heat conductivity coefficient of less than 0.04 kJ/(m-h-°C).
As a preferred embodiment of the present invention, the first reaction container 110 and the second reaction container 120 are both arranged obliquely relative to the horizontal plane, and the inclination angle is 0.1 - 1°.
Specifically, the oblique arrangement of the first reaction container 110 and the second reaction container 120 is beneficial to the in-out of materials.
As shown in figure 1, as a preferred embodiment of the present invention, each of the first reaction container 110 and the second reaction container 120 is provided with:
a spraying mechanism 101 which is used for spraying water into the first reaction container 110 or the second reaction container 120; a ventilation mechanism 102 which is used for ventilating the first reaction container 110 or the second reaction container 120; an aerobic bacteria agent spraying mechanism 103 which is used for supplying aerobic bacteria to the first reaction container 110 or the second reaction container 120; at least one or more of the following detection devices 130, the detection devices 130 including: an oxygen content detection device which is used for detecting the oxygen content in the first reaction container 110 or the second reaction container 120; a humidity detection device which is used for detecting the humidity in the first reaction container 110 or the second reaction container 120; a temperature detection device which is used for detecting the temperature in the first reaction container 110 or the second reaction container 120; and a PH detection device is used for detecting the PH value in the first reaction container 110 or the second reaction container 120; the detection device 130 is electrically connected with the control system 3, and the detection result of the detection device 130 is fed back to the control system 3; and the control system 3 is used for controlling the operation of the spraying mechanism 101, the ventilation mechanism 102 and the aerobic bacteria agent spraying mechanism 103 according to the feedback result.
Specifically, the spraying mechanism 101 is capable of spraying water into the first reaction container 110 and the second reaction container 120 to improve the water content of materials so as to facilitate the fermentation of aerobic bacteria. The ventilation mechanism 102 is capable of supplying oxygen into the first reaction container 110 and the second reaction container 120, thus the activity of the aerobic bacteria can be improved, and the fermentation efficiency of the aerobic bacteria is improved. When the aerobic bacteria are insufficient, the aerobic bacteria agent spraying mechanism 103 can be used for supplying the aerobic bacteria to the first reaction container 110 or the second reaction container 120. The oxygen content, temperature, humidity and the like in the first reaction container 110 and the second reaction container 120 can be monitored in real time through corresponding detection devices 130, and the monitoring results are fed back to the control system 3; and the operation of the spraying mechanism 101, the ventilation mechanism 102 and the aerobic bacteria agent spraying mechanism 103 is automatically controlled through the control system 3. In addition, in order to increase the detection accuracy, three or more than three detection devices such as the oxygen content detection devices, the humidity detection devices, the temperature detection devices and the PH detection devices are arranged in the axial direction of the first reaction container 110.
As shown in figure 3, as a preferred embodiment of the present invention, the first reaction container 110 and the second reaction container 120 are both sealed reaction bins in a form of a rotary kiln structure; each sealed reaction bin includes a kiln body 10, a kiln head 11 and a kiln tail 12; the kiln body 10 is provided with a driving assembly; the driving assembly is used for driving the kiln body 10 to rotate relative to the kiln head 11 and the kiln tail 12 so as to overturn raw materials in the kiln body 10, which is beneficial to uniform mixing and uniform fermentation of the raw materials.
As a preferred embodiment of the present invention, the first circulating pipeline 23, the second circulating pipeline 24 and the third circulating pipeline 25 are all arranged on the kiln head 11 and the kiln tail 12 of the reaction container 1, and are not rotated along with the kiln body 10 of the first reaction container 110 and the second reaction container 120.
Specifically, the yield of the rotary kiln is very high, and the requirements of large-volume and large-mass composting can be met. Moreover, the rotary kiln is convenient to rotate, and can turn over and stir materials to promote thorough and complete reaction. A rack for fixing and supporting the rotary kiln is arranged at a bottom part of the kiln body 10. The rack plays roles in supporting the whole sealed reaction bins, adjusting the inclination angle of the sealed reaction bins, fixing the heat exchange device 2 and the ventilation mechanism 102, etc.
As shown in figures 3 to 5, as a preferred embodiment of the present invention, the driving assembly includes: a roller support 10a which is arranged on the kiln head 11 and the kiln tail 12; a rotary kiln wheel belt 10b which is arranged on the kiln body 10, is in rolling connection with a roller on the roller support 10a and is used for limiting the axial movement of the kiln body 10 relative to the kiln head 11 and the kiln tail 12; a speed regulating motor 10c which is arranged on the roller support 10a; a first gear 10d which is arranged on the kiln body 10 and synchronously rotated with the rotary kiln wheel belt 10b; and a second gear 10e which is arranged on an output end of the speed regulating motor 10C and is in meshed transmission with the first gear 10d; specifically, the rotary kiln wheel belt 10b is supported by the roller support 10a. The first gear 10d is a large gear; the second gear 10e is a small gear. The small gear can be driven to rotate by the speed regulating motor 10c, the large gear is driven to rotate by the small gear, and then the kiln body 10 is driven to rotate by the large gear through the rotary kiln wheel belt 10b, so that the materials in the sealed reaction bin can be overturned and stirred, and the reaction is promoted to be thorough and complete.
As shown in figures 2 to 4, as a preferred embodiment of the present invention, the kiln head 11 is provided with a feed inlet 11b, a liquid injection pipe 11c and a gas outlet 11a; the spraying mechanism 101 and the aerobic bacteria agent injection mechanism 103 are used for spraying water and supply aerobic bacteria into the kiln body 10 through the liquid injection pipe
11c; and the gas outlet 11a is used for discharging gas with high CO; content in the kiln body 10 and communicates with an exhaust gas purification system.
Specifically, gas generated in the first reaction container 110 enters the exhaust gas purification system through the gas outlet 245, and can be discharged after being purified and deodorized by the exhaust gas purification system, so that the loss of N, S and the like in the composting process is reduced.
Specifically, the spraying mechanism 101 and the aerobic bacteria agent spraying mechanism 103 share a set of liquid injection pipe 11c, and are switched according to the composting working condition, and aerobic bacteria can also be directly added into the spraying mechanism according to the working condition requirements and are sprayed into the kiln body 10 together with spraying liquid.
As a preferred embodiment of the present invention, the liquid injection pipe 11c is arranged at a centre upper position of the kiln body 10, and three or more injection openings are uniformly distributed in the circumferential direction of the liquid injection pipe 11c.
As shown in figures 2 to 4, as a preferred embodiment of the present invention, a discharge port 12a and a gas inlet 12b are formed in the Kiln tail 12; a ventilation pipe is arranged in the kiln body 10; and the ventilation pipe communicates with the ventilation mechanism 102 through the gas inlet 12b to realize the effects of forced ventilation and oxygenation and increase of the reaction speed.
As a preferred embodiment of the present invention, the ventilation pipe is arranged in the centre upper position of the kiln body 10; and three or more injection ports are uniformly distributed in the peripheral direction of the ventilation pipe.
As shown in figure 8, as a preferred embodiment of the present invention, second heat preservation layers 600 are arranged on the outer surfaces of the first reaction container 110 and the second reactor 120.
As a preferred embodiment of the present invention, inner layers of the second heat preservation layers 600 are formed by rolling thin steel plates; and the inner diameters of the second heat preservation layers 600 are larger than the outer diameter of the kiln body 10 by 5- 10 mm.
As shown in FIG. 8, as a preferred embodiment of the present invention, the second heat preservation layers 600 are of an opening and closing structure, the lower half part of each second heat preservation layer 600 is fixed on the rack, and the upper half part of each second heat preservation layer 600 can be opened and closed randomly by 180 degrees.
Specifically, the second heat preservation layer 600 is mounted by connecting multiple sections in series in the axial direction of the kiln body 10, and has the advantages of being convenient to mount and not affecting later maintenance of the kiln body 10.
As a preferred embodiment of the present invention, the second heat preservation layer 600 is not rotated along with the kiln body 10.
As a preferred embodiment of the present invention, the second heat preservation layers 600 are made of a light heat preservation material having the thickness of 50-200 mm and the heat conductivity coefficient of less than 0.04 kJ/(m-h-°C).
As shown in figure 1, as a preferred embodiment of the present invention, the aerobic composting system further includes: a batching container, a material conveying device which is used for conveying materials in the batching container into the first reaction container 110 or the second reaction container 120; and a material pushing device which is used for pushing the materials conveyed by the material conveying device into the first reaction container 110 or the second reaction container.
Specifically, the materials in the batching container are from a raw material storage yard and are conveyed to the batching container by a belt system. The first reaction container 110 and the second reaction container 120 are both provided with the feed inlets 11b, and the materials from the material conveying device are pushed into the first reaction container 110 by the material pushing device. The material pushing device can adopt hydraulic feeding, spiral feeding and other modes, preferably a spiral feeding mode, and has the effect of pushing the materials into the first reaction container 110 or the second reaction container 120 from the feed inlets 11b.
As a preferred embodiment of the present invention, the exhaust gas of the first reaction container 110 and the second reaction container 120 is subjected to centralized treatment, so that the circumstance that N in compost is easily volatilized and lost in a form of NH and emits odour to pollute air is effectively avoided; meanwhile, liquid obtained after exhaust gas treatment is recycled through the spraying machine 101 and used for humidification in the composting process, so that the loss of nitrogen elements in the composting process is effectively reduced, and then the composting quality of the aerobic composting system is improved.
Embodiment 2
According to the embodiment, the aerobic composting system in the embodiment 1 is used for actual composting, and the composting process is as follows: firstly, materials to be composted in the raw material storage yard are crushed respectively, and the materials to be composted can be one or a combination of more of livestock and poultry manure, wheat straw, sludge and kitchen waste and are screened by a screen to ensure that the particle size of the composted materials is less than 1 mm, so that circumstances of poor composting effect and the like due to a fact that the mixing uniformity, the reaction rate and the oxygen ventilation pore diameter in the aerobic composting process are affected by non-uniform particle size of the composted materials are avoided;
then, C/N in the materials to be composted is analysed by a carbon-nitrogen ratio analyser, the materials to be composted and having C/N set to be 25 - 35 are weighed to avoid the circumstances that N in compost is prone to volatilization loss in an NH: form and emits odour due to too low C/N value, microbial growth is inhibited due to insufficient C, the decomposition effect on organic matter is reduced, as well as avoiding the circumstance that the decomposition speed of the organic matter is reduced because of microbial N deficiency caused by too high C/N value and growth hindered;
the weighed materials to be composted are conveyed to the batching container through the belt system, quantitative aerobic bacteria are added and uniformly mixed, and biogas slurry,
composting leachate or circulating hot water and the like are added to adjust the water content of the materials to be 45 - 60%, so that the circumstance that the composting temperature and the decomposition speed are influenced due to a fact that aerobic fermentation cannot be carried out because excessive water in the composting materials occupies a free space for gas exchange is avoided;
then, the material conveying device and the material pushing device are used for pushing the materials into the first reaction container 110 which is obliquely arranged at an angle of 0.1 - 1°, and meanwhile, the ventilation mechanism 102 is used for performing forced ventilation on the first reaction container 110 through the gas inlet 12b and feeding air having high O2 concentration.
Under the action of the driving assembly, the kiln body 10 is rotated at a speed of
0.5- 2 rpm to drive the materials to turn over and gradually move towards the Kiln tail 12; meanwhile, under the heating action of the liquid circulating heating and cooling device 26, the heat transfer medium in the first energy storage container 21 is heated, the control module 31 on the control system 3 is used for controlling the first electric flow pump 32 to start and quickly heating the compost materials in the temperature increase stage in the first reaction container
110 through the first circulating pipeline 23, and the materials in the kiln body 10 enter the high temperature stage from the temperature increase stage after 3 - 5 h, so that the temperature increase of the compost in the heating stage in the first reaction container 110 is accelerated, microorganisms are promoted to quickly grow, metabolize and reproduce, namely, the reaction rate of the aerobic composting system is improved, and the overall production period in the composting process is shortened; the control module 31 on the control system 3 is used for controlling the first electric flow pump 32 to stop running as well as controlling second electric flow pump 33 to start, and the second electric flow pump 33 is used for exchanging heat between the low-temperature heat transfer medium in the second energy storage container 22 and the compost materials in the high-temperature stage in the first reaction container 110 through the second circulating pipeline 24, so that a circumstance that the material temperature in the first reaction container 110 in the high temperature stage rapidly reaches the highest temperature of 80°C to cause passivation of activity of certain microorganisms, reduction of composting efficiency, waste of heat energy, and long composting period can be avoided; and after 5 - 10 d, the second electric flow pump 33 is closed, and the material temperature in the first reaction container 110 in the high-temperature stage quickly reaches the highest temperature of 80°C, thus pathogenic bacteria can be killed in the continuous high-temperature composting process of organic solid wastes at 80°C to achieve harmlessness, and finally, an organic fertilizer product is obtained by composting and drying for 30-40 d and discharged from the discharge port 12a of the kiln tail 12 for the next circulating aerobic composting and charging stage.
At the same time, through interval arrangement of composting material reaction stages in the second reaction container 120 and the first reaction container 110, a large amount of heat energy (namely the high temperature stage, the temperature decrease stage and the composting stage) generated by biochemical reaction of materials in the first reaction container 110 and the second reaction container 120 can be maintained at 60 - 65°C inside the kiln body 10, and meanwhile, redundant heat energy is subjected to heat energy transfer by the heat transfer medium (water) in the heat exchange device 3, and the heat transfer medium is heated to 60-65°C while circulating in the central main pipe 295 and the circulating branch pipe 320.
Hot water of 60-65°C is pumped to the first energy storage container 21 or the second energy storage container 22 for storage, or the heat energy in the first energy storage container 21 can be pumped to users for use, then the high-temperature or low-temperature heat transfer medium in the first energy storage container 21 or the second energy storage container 22 is pumped to the first reaction container 110 and the second reaction container in the temperature increase stage or in the high temperature stage, the temperature decrease stage and the composting stage for heat exchange (heating or refrigeration), thereby realizing comprehensive utilization of heat of composting materials in different reaction stages in different reaction containers 1, further improving the reaction rate and shortening the composting cycle. In the process, the detection devices arranged in the first reaction container 110 and the second reaction container 120 can be used for feeding back the oxygen content, humidity, temperature and other physicochemical characteristics in the containers to the control module 31, thus the control module 31 can be used for automatically controlling the operation states (opening and closing, opening strength and the like) of the ventilation mechanism 102, the aerobic microbial agent injection mechanism 103 and the spraying mechanism 101 according to the feedback data, then the reaction temperature of the materials in the first reaction container 110 and the second reaction container 120 in the high temperature stage can be stably maintained at 60- 65°C, the materials in the first reaction container 110 and the second reaction container 120 in the temperature increase stage can be heated by the heat exchanged high-temperature heat transfer medium while ensuring rapid biochemical reaction of composting in the high temperature stage, and as a result, the heat energy of each reaction stage can be comprehensively utilized and the reaction rate of the aerobic composting system can be improved.
According to the present invention, the reaction stages of composting materials in at least two reaction containers 1 are different, and the control system 3 is matched with the heat exchange device 2 for use, so that the temperature of the high temperature reaction stage can be stably maintained in a range of 60 - 65°C, hot water of 60 - 65°C can be obtained to heat the reaction containers in the temperature increase stage, and then the duration period of the temperature increase stage of the composting materials is shortened; meanwhile, the circumstance that the material temperature in the reaction containers in the high temperature stage rapidly reaches the highest temperature to cause passivation of activity of certain microorganisms, reduction of composting efficiency, waste of heat energy, and long composting period can be avoided; and the effects of comprehensively utilizing the heat energy in different composting reaction stages, increasing the reaction rate and shortening the reaction period are achieved.
The above is only better embodiments of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included in the scope of protection of the present invention.
Claims (8)
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| US8361171B2 (en) * | 2007-01-09 | 2013-01-29 | Institute Of Food Research | Method and kit |
| CN112592219A (en) * | 2020-12-28 | 2021-04-02 | 华中科技大学 | Aerobic composting system |
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2023
- 2023-03-16 NL NL2034351A patent/NL2034351B1/en active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5116760A (en) * | 1989-07-26 | 1992-05-26 | Hagihara Industries, Inc. | Apparatus for manufacture of organic fertilizers |
| US6524848B2 (en) * | 2000-09-23 | 2003-02-25 | Mcnelly James J. | Recirculating composting system |
| US8361171B2 (en) * | 2007-01-09 | 2013-01-29 | Institute Of Food Research | Method and kit |
| CN112592219A (en) * | 2020-12-28 | 2021-04-02 | 华中科技大学 | Aerobic composting system |
| CN112625873A (en) * | 2020-12-28 | 2021-04-09 | 华中科技大学 | Two-phase dry anaerobic digestion fermentation system |
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