CN102517200A - Organic waste dry anaerobic high-temperature fermentation system and fermentation process - Google Patents

Abstract

The invention relates to an organic waste dry anaerobic high-temperature fermentation system and a fermentation process. The fermentation system comprises a feeding system (1), a dry anaerobic fermentation tank (2) with an agitating system (3), a heat preservation and heating system (4), a biogas slurry and biogas residue treatment system (5), an exhaust system (6) and a control system. The organic waste dry anaerobic high-temperature fermentation system and the fermentation process have the beneficial effects that harmless treatment, reduction treatment and resource treatment can be carried out on domestic organic wastes, so that the cyclic utilization of the wastes is realized; and moreover, the treatment efficiency is high, and the energy consumption and the treatment cost are low.

Description

A dry anaerobic high-temperature fermentation system and fermentation process for organic waste

technical field

The invention relates to the technical field of processing organic waste such as organic parts in domestic waste, kitchen waste, greening waste, crop straw, livestock manure, septic tank bottom sludge, activated sludge, water hyacinth, blue algae and the like.

Background technique

At present, the organic components in domestic waste in our country are constantly increasing. Compared with developed countries, the organic components in domestic waste in my country are very different. The content of paper is low, the content of kitchen waste and green waste is high, and the moisture content of kitchen waste is high. The moisture content is 70% to 80%, and the moisture content of melon skin can be as high as 95%. Incineration of garbage has the advantages of recovering heat energy and reducing the amount of garbage most thoroughly. After incineration, the volume of garbage can be reduced by 80% to 95%. However, organic garbage has high moisture content and low net calorific value, so it is not suitable for incineration, and incineration is prone to produce "dioxins" substances, causing serious environmental pollution. Landfilling garbage directly will produce a large amount of landfill leachate, which can easily pollute groundwater and surface water if not properly treated. Because of its complex composition and high concentration, leachate is expensive to treat. Using composting to treat garbage can turn garbage into organic fertilizer, but this kind of garbage fertilizer has low fertilizer efficiency, limited sales, and little room for development.

Organic matter contains a large amount of water, carbohydrates, fat and protein, etc., which is the material basis for biological treatment. Anaerobic fermentation is the consumption of organic matter through the metabolic activities of microorganisms under anaerobic conditions, accompanied by the production of methane and carbon dioxide. Anaerobic fermentation is also called biogas fermentation because it can produce biogas that is convenient for recycling. The anaerobic treatment process does not require oxygen supply, low power consumption, most of the organic matter is converted into biogas, which can be used as bioenergy, the fermentation residue is harmless, and parasite eggs and pathogenic microorganisms can be killed during the fermentation process. After fermentation, the organic matter can become a fertilizer with higher fertilizer efficiency, and at the same time, it can also be made into a new type of biomass fuel - combustion rod RDF together with the sludge. Therefore, anaerobic fermentation is often used as an important link in the establishment of a virtuous cycle agricultural ecosystem in the research and practice of ecological agriculture, and has received more and more attention.

According to the different solid content (TS), anaerobic fermentation is divided into two types: wet type (TS is 5% to 15%) and dry type (TS is 15% to 40%). Most of the anaerobic fermentation projects that have been built and operated use wet fermentation. The wet anaerobic fermentation reactor has a large volume, a low gas production rate, and a large water consumption for diluting the fermentation substrate, which not only increases the operating cost of the process, but also wastes water resources. As a new type of garbage biological treatment process, dry anaerobic fermentation technology has obvious advantages compared with wet anaerobic fermentation technology in that it has higher organic load, less sewage treatment volume, and smaller digestion reactor volume per unit of garbage.

Anaerobic fermentation can be divided into normal temperature fermentation (natural temperature), medium temperature fermentation (30-40°C) and high-temperature fermentation (50-60°C) according to different temperatures. The temperature of anaerobic fermentation is directly proportional to the gas production. The gas production is an important parameter to characterize the quality of anaerobic fermentation. The essence of the relationship between them is the digestion rate of the fermentation substrate. The higher the temperature, the faster the decomposition rate of organic matter.

The existing dry anaerobic fermentation process mostly adopts mesophilic fermentation, which has problems such as slow fermentation rate and slow decomposition rate of organic matter. The currently developed dry-type high-temperature anaerobic fermentation technology requires a wide variety of fermentation equipment, which increases the process cost and is not conducive to management and maintenance. The biogas slurry and biogas residue produced by fermentation cannot be effectively treated. Due to the poor fluidity of materials with high solid content in the fermentation system, the heat transfer effect between materials is poor, it is difficult to maintain a constant temperature and uniform heat transfer of materials in the dry anaerobic fermentation tank, and it is difficult to feed and discharge materials.

Contents of the invention

The purpose of the present invention is to solve the deficiencies of the prior art, and to provide a system and process for the joint treatment of domestic organic waste, livestock and poultry manure, septic tank bottom sludge, and activated sludge, so as to improve treatment efficiency, reduce energy consumption and treat cost, prevent secondary pollution, and prepare the products after fermentation and separation into fertilizers with higher fertilizer efficiency, new biomass fuels, and biogas energy needed by society, so as to make domestic organic waste harmless, reduce, and recycle processing and recycling of waste.

The purpose of the present invention is achieved through the following technical solutions.

A dry-type anaerobic high-temperature fermentation system for organic waste, including a feed system, a dry-type anaerobic fermentation tank with a stirring system, a thermal insulation heating system, a biogas slurry and residue treatment system, an exhaust system and a control system; The material system includes a storage box, a conveyor, a semi-wet pulverizer, and a pretreatment tank arranged in sequence; the biogas slurry and residue treatment system includes a sludge dehydrator and a sewage processor connected to each other through pipelines; the exhaust gas The system includes a gas storage tank connected to the dry anaerobic fermentation tank through pipelines; the pretreatment tank of the feed system is connected to the feed port of the dry anaerobic fermentation tank through pipelines, and the dry anaerobic fermentation tank is connected to the heat preservation and heating tank. The systems are connected through circulation pipelines, and the dry anaerobic fermentation tank is also connected with the sludge dehydrator and sewage processor of the biogas slurry and residue treatment system through pipelines.

The sewage processor of the present invention is connected to the thermal insulation heating system or to the discharge system through pipelines.

The stirring system of the dry anaerobic fermentation tank of the present invention comprises five groups of stirring mechanisms sequentially arranged in the dry type anaerobic fermentation tank from the feed end to the discharge end of the dry type anaerobic fermentation tank; each group of stirring mechanisms includes A reducer located outside the dry-type anaerobic fermentation tank, a stirring shaft connected with the reducer and installed vertically in the dry-type anaerobic fermentation tank, and a stirring blade installed on the stirring shaft. Three sets of stirring blades are installed along different heights on each stirring shaft, and adjacent stirring blades are arranged in a staggered 90° manner. The stirring paddle is a paddle with mesh. The uppermost stirring blade is located above the fermentation liquid level in the dry anaerobic fermentation tank, and the bottommost stirring blade is close to but not in contact with the bottom surface of the dry anaerobic fermentation tank. A sealing device is installed on the top of the stirring shaft located in the dry anaerobic fermentation tank.

The bottom of the side wall of the dry-type anaerobic fermentation tank of the present invention is an inclined surface that gradually closes downwards, and the bottom surface of the dry-type anaerobic fermentation tank is a slope that gradually decreases from the feed end to the discharge end.

The heating and heat preservation system of the present invention includes a cold water tank, an air source heat pump, a heat preservation water tank, a radiator, and a heat exchanger sequentially connected by water pipes; the radiator is arranged in a dry-type anaerobic fermentation tank; The return pipe is connected, and the heat preservation water tank is connected with the radiator inlet pipe and the radiator outlet pipe connected with the radiator, and the heat exchanger inlet pipe and the heat exchanger outlet pipe connected with the heat exchanger; the heat exchanger is also connected with the dry anaerobic The biogas slurry feed pipe of the circulation pipeline of the fermenter is connected with the biogas slurry discharge pipe.

The present invention is also provided with a dehydration and desulfurization device at the front end of the gas storage tank of the exhaust system.

A dry-type anaerobic high-temperature fermentation process for organic waste, the steps are as follows:

将贮料箱内的待处理物料通过输送机输送到半湿粉碎机内破碎至不大于5mm的规格，通过管路输送至预处理池，在预处理池内进行2～3天的酸化预处理后，再将物料泵送到干式厌氧发酵罐内进行封闭搅拌及发酵；

The materials to be processed in the storage box are transported to the semi-wet pulverizer by the conveyor and crushed to a size not larger than 5mm, and then transported to the pretreatment pool through the pipeline, and after 2 to 3 days of acidification pretreatment in the pretreatment pool , and then pump the material to the dry anaerobic fermentation tank for closed stirring and fermentation;

将发酵得到的沼液通过管路送至保温加热系统进行加热，将部分加热后的沼液再通过管路回送至干式厌氧发酵罐与罐内物料混合搅拌，把干式厌氧发酵罐内的物料加热至55～60℃，调节物料的固含率为30%～40%；

The fermented biogas slurry is sent to the thermal insulation heating system through the pipeline for heating, and part of the heated biogas slurry is returned to the dry anaerobic fermentation tank through the pipeline to mix and stir with the materials in the tank, and the dry anaerobic fermentation tank The material inside is heated to 55-60°C, and the solid content of the material is adjusted to 30%-40%;

将发酵完成的物料用从干式厌氧发酵罐内抽出送至污泥脱水机进行固液分离，将分离出来的沼渣贮存留待进一步利用，分离出来的沼液通过污水处理器处理后送至保温加热系统循环利用或者处理达标后送至排放系统；污水处理过程产生的污泥再通过管路输送到干式厌氧发酵罐内进行发酵；

The fermented material is pumped out from the dry-type anaerobic fermentation tank and sent to the sludge dehydrator for solid-liquid separation, and the separated biogas residue is stored for further use. The separated biogas slurry is treated by the sewage processor and sent to The thermal insulation heating system is recycled or sent to the discharge system after the treatment reaches the standard; the sludge generated in the sewage treatment process is then transported to the dry anaerobic fermentation tank through the pipeline for fermentation;

当干式厌氧发酵罐内的压力达到设定值时，通过控制系统启动气泵把干式厌氧发酵罐内的气体抽到贮气柜内。

When the pressure in the dry-type anaerobic fermentation tank reaches the set value, the air pump is activated by the control system to pump the gas in the dry-type anaerobic fermentation tank into the gas storage cabinet.

The invention has high efficiency in processing domestic organic waste, low energy consumption, and will not cause secondary pollution. The products after fermentation and separation can be prepared to obtain high-efficiency fertilizers, biomass fuels and biogas energy, and realize the harmlessness and reduction of domestic organic waste. The domestic organic waste has been effectively recycled. The invention can monitor the fermentation state of the material in real time through the control system, automatically control the operation of each equipment in the system, and realize the automatic control of the system.

The content of the present invention will be further elaborated below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the system diagram of dry type anaerobic high-temperature fermentation of organic waste of the present invention;

Fig. 2 is a schematic diagram of setting of the stirring system of the dry anaerobic fermentation tank of the present invention;

Fig. 3 is the left view of Fig. 2;

Fig. 4 is a top view of a group of stirring devices;

Fig. 5 is a structural schematic diagram of the heat preservation and heating system.

In the figure, 1—feeding system; 1a—storage box; 1b—conveyor; 1c—semi-wet pulverizer; 1d—pretreatment tank; 2—dry anaerobic fermentation tank; 2a—dry anaerobic fermentation tank Bottom of side wall; 2b—bottom of dry anaerobic fermentation tank; 2c—inlet; 2d—outlet; 3—stirring system; 3a—reducer; 3b—stirring shaft; 3c—stirring blade; Device; 4—insulation and heating system; 4a—cold water tank, 4b—air source heat pump; 4c—insulation water tank; 4d—radiator; 4e—heat exchanger; 4f—water pipe; 4g—return pipe; 4h—radiator inlet pipe ;4i—radiator outlet pipe; 4j—heat exchanger inlet pipe; 4k—heat exchanger outlet pipe; 4m—biogas slurry feed pipe; 4n—biogas slurry discharge pipe; 5—biogas slurry and residue treatment system; 5a —Sludge dehydrator; 5b—Sewage processor; 5c—Pipeline; 6—Exhaust system; 6a—Gas storage tank; 6b—Dehydration and desulfurization device; 7—Emission system.

Detailed ways

As shown in Figure 1, the organic waste dry-type anaerobic high-temperature fermentation system of the present invention includes a feed system 1, a dry-type anaerobic fermentation tank 2 with a stirring system 3, a thermal insulation heating system 4, and a biogas slurry and residue treatment system 5 , Exhaust system 6 and control system. The feeding system 1 includes a storage box 1a, a conveyor 1b, a semi-wet pulverizer 1c, and a pretreatment tank 1d arranged in sequence. The biogas slurry and residue treatment system 5 includes a sludge dehydrator 5a and a sewage processor 5b connected to each other through a pipeline 5c; the exhaust system 6 includes a gas holder connected with a dry anaerobic fermentation tank through a pipeline 6a; the pretreatment tank 1d of the feed system is connected to the feed port of the dry anaerobic fermentation tank 2 through pipelines, and the dry anaerobic fermentation tank 2 is connected to the thermal insulation heating system 4 through a circulation pipeline. The oxygen fermenter 2 is also connected to the sludge dehydrator 5a and the sewage processor 5b of the biogas slurry and residue treatment system through pipelines. The sewage processor 5b can also be connected to the thermal insulation heating system 4 or to the discharge system 7 through pipelines. A dehydration and desulfurization device 6b may also be provided at the front end of the gas holder 6a of the exhaust system 6 .

The control system of the present invention consists of the electric control system of each equipment in the dry anaerobic high temperature fermentation system and the control system of the pH value monitoring sensor, pressure monitoring sensor, temperature monitoring sensor and material position detection sensor arranged in the dry anaerobic fermentation tank composition. It can monitor the fermentation state of the material in the dry anaerobic fermentation tank in real time, and control the operation of each equipment in the dry anaerobic fermentation system according to the parameter feedback of each sensor, so as to realize automatic control and adjustment of the material in the dry anaerobic fermentation tank Liquid level, temperature, PH value and pressure inside the tank as well as incoming and outgoing materials.

The dry-type anaerobic fermentation tank 2 of the present invention adopts an all-concrete structure, and an observation window can be provided on the side wall of the dry-type anaerobic fermentation tank. The bottom 2a of the side wall of the dry-type anaerobic fermentation tank 2 is an inclined surface that gradually closes downwards, and the bottom surface 2b of the dry-type anaerobic fermentation tank is a slope that gradually decreases from the feed end to the discharge end, so that the reacted materials can Deposited to the bottom, and facilitate the completion of the reaction of the material flow to the discharge port 2d. The stirring system 3 of the dry anaerobic fermentation tank is shown in Fig. 3, Fig. 4, and Fig. 5. Group of stirring mechanisms; each group of stirring mechanisms includes a reducer 3a outside the dry-type anaerobic fermentation tank, a stirring shaft 3b connected with the reducer and vertically installed in the dry-type anaerobic fermentation tank, and a stirring paddle installed on the stirring shaft Leaf 3c. Three sets of stirring blades 3c are installed along different heights on each stirring shaft, and the adjacent stirring blades are arranged staggered at 90°, and the uppermost stirring blade is located above the fermentation liquid level in the dry anaerobic fermentation tank , the stirring paddle at the bottom is close to but not in contact with the bottom of the dry anaerobic fermentation tank. The stirring paddle 3c is a paddle with a mesh. A sealing device 3d is installed on the top of the stirring shaft located in the dry anaerobic fermentation tank. Through the rotation and mutual cooperation of the five sets of stirring mechanisms arranged in sequence in the dry anaerobic fermentation tank, it can effectively solve the problem of material propulsion, discharge and full stirring, especially if the stirring shaft is installed along different heights on each stirring shaft. Three sets of stirring blades, the adjacent stirring blades are arranged staggered at 90°, not only can push the material better, but also can make the organic matter and the inoculum more fully mixed, so that the medium, microorganisms and nutrients in the fermentation product Suspend evenly to maintain uniform temperature and acidity. The uppermost stirring paddle is located above the fermentation liquid surface in the dry-type anaerobic fermentation tank, which can effectively prevent crusting on the surface of the fermented product. The bottommost stirring blade is close to but not in contact with the bottom surface of the dry-type anaerobic fermentation tank, which can avoid The material deposition at the bottom of the dry anaerobic fermentation tank can also reduce the corrosion of the stirring mechanism. The stirring paddle adopts the paddle with mesh, which can reduce the resistance during the stirring process. The sealing device 3d can prevent the dry anaerobic fermentation tank from leaking due to the installation of the stirring device.

The heating and heat preservation system 4 of the present invention, as shown in Figure 5, includes a cold water tank 4a, an air source heat pump 4b, a heat preservation water tank 4c, a radiator 4d, and a heat exchanger 4e connected sequentially through a water pipe 4f; In the oxygen fermentation tank 2; between the air source heat pump 4b and the heat preservation water tank 4c, a return water pipe 4g is also connected, and the heat preservation water tank 4c is respectively connected with the radiator water inlet pipe 4h and the radiator water outlet pipe 4i of the radiator 4d and the heat exchanger. The heat exchanger inlet pipe 4j and the heat exchanger outlet pipe 4k of 4e; the heat exchanger 4e is also connected to the biogas slurry feed pipe 4m and the biogas slurry discharge pipe 4n connected to the circulation pipeline of the dry anaerobic fermentation tank.

The semi-wet pulverizer, pretreatment tank, air source heat pump, radiator, heat exchanger, dehydration and desulfurization device, sewage processor, and sludge dehydrator used in the system of the present invention can all adopt prior art equipment.

The fermentation process steps of the organic waste dry type anaerobic high temperature fermentation system of the present invention are as follows:

将生活垃圾中的有机部分、厨余垃圾、绿化垃圾、农作物秸秆、畜禽粪便、化粪池底泥、活性污泥、机场航空垃圾中的有机物以及水葫芦、蓝藻等物料经称重后贮存到贮料箱1a。贮料箱用Q235A材料制成，并做防腐处理。贮料箱内装有位置监测传感器，当物料达到设定的位置时，通过控制系统开启贮料箱的出口阀门，启动输送机1b，把物料输送到半湿粉碎机1c内进行粉碎，粉碎后的物料颗粒规格要求控制在5mm以内，物料的粒径愈小，输送难度愈低，便于搅拌和传热均匀，从而加快有机物的发酵。粉碎后的物料通过输送装置输送到预处理池1d内，在预处理池内进行酸化预处理2～3天，通过进料系统的进料泵送入干式厌氧发酵罐2内进行封闭搅拌及发酵，干式厌氧发酵罐上设有进料口2c，在进料口设置有阀门，物料发酵时封闭干式厌氧发酵罐。密封的干式厌氧发酵罐保证了高温厌氧发酵的厌氧环境。

Weigh the organic part of domestic waste, kitchen waste, green waste, crop straw, livestock and poultry manure, septic tank bottom sludge, activated sludge, organic matter in airport aviation waste, water hyacinth, blue-green algae and other materials and store them to storage bin 1a. The storage tank is made of Q235A material and treated with anticorrosion. The storage box is equipped with a position monitoring sensor. When the material reaches the set position, the outlet valve of the storage box is opened through the control system, the conveyor 1b is started, and the material is transported to the semi-wet pulverizer 1c for crushing. The particle size of the material is required to be controlled within 5mm. The smaller the particle size of the material, the lower the difficulty of transportation, which is convenient for stirring and uniform heat transfer, thereby accelerating the fermentation of organic matter. The pulverized material is transported to the pretreatment tank 1d through the conveying device, acidified and pretreated in the pretreatment tank for 2 to 3 days, and then sent into the dry anaerobic fermentation tank 2 through the feed pump of the feed system for closed stirring and For fermentation, the dry anaerobic fermentation tank is provided with a feed inlet 2c, and a valve is arranged at the feed inlet, and the dry anaerobic fermentation tank is closed when the material is fermented. The sealed dry anaerobic fermentation tank ensures an anaerobic environment for high-temperature anaerobic fermentation.

将发酵得到的沼液通过管路送至保温加热系统4进行加热。干式厌氧发酵罐在进物料之前，通过温度传感器监测干式厌氧发酵罐内的温度，启动保温加热系统对干式厌氧发酵罐进行加热保温，随着物料进入干式厌氧发酵罐内，实时监测温度，通过控制系统控制安装在干式厌氧发酵罐内的散热器4d和连接散热器的热水循环管路内的水温度流速，对干式厌氧发酵罐进行加热及保温，以控制干式厌氧发酵罐内温度恒定在55～60℃。加热系统的冷水箱4a提供空气源热泵4b工作所需冷水，通过水管由冷水箱进入空气源热泵，空气源热泵将冷水加热，热水进入保温水箱4c，若保温水箱内热水低于所需温度，通过回流水管进入空气源热泵循环加热，保温水箱中的热水通过连接水管进入散热器4d，热水通过散热器进水管4h进入散热器后，再通过散热器出水管4i回流至保温水箱。当换热器工作时，保温水箱中的热水通过换热器进水管4j进入换热器，通过换热器出水管4k回流至保温水箱，干式厌氧发酵罐2中的沼液部分通过沼液出料管4n流至换热器，通过加热后再经沼液进料管4m回流至干式厌氧发酵罐与罐内物料混合搅拌，从而把干式厌氧发酵罐内的物料加热。物料进入干式厌氧发酵罐后，通过管路喷淋污泥对干式厌氧发酵罐内的物料进行接种和调节固含率，使物料的固含率为30%～40%，ph值保持在6.6-7.2之间。通过空气源热泵、保温水箱、散热器和换热器的合理连接及工作，利用空气源热泵提供的热能，既可以通过干式厌氧发酵罐内散热器的工作实现对干式厌氧发酵罐内环境的保温，又可以通过换热器的工作将沼液循环加热，从而高效快速的对干式厌氧发酵罐内的物料加热及保温。

The fermented biogas slurry is sent to the thermal insulation heating system 4 through pipelines for heating. Before the dry-type anaerobic fermentation tank enters the material, the temperature in the dry-type anaerobic fermentation tank is monitored by a temperature sensor, and the heat preservation and heating system is started to heat the dry-type anaerobic fermentation tank. As the material enters the dry-type anaerobic fermentation tank Inside, the temperature is monitored in real time, and the radiator 4d installed in the dry anaerobic fermentation tank and the water temperature and flow rate in the hot water circulation pipeline connected to the radiator are controlled by the control system to heat and keep the dry anaerobic fermentation tank , to control the temperature in the dry anaerobic fermentation tank to be constant at 55-60°C. The cold water tank 4a of the heating system provides the cold water required for the work of the air source heat pump 4b, and enters the air source heat pump from the cold water tank through the water pipe. The air source heat pump heats the cold water, and the hot water enters the heat preservation water tank 4c. Temperature, enters the air source heat pump through the return pipe for circulation heating, the hot water in the heat preservation water tank enters the radiator 4d through the connecting water pipe, enters the radiator through the radiator water inlet pipe 4h, and then flows back to the heat preservation water tank through the radiator outlet pipe 4i . When the heat exchanger is working, the hot water in the thermal insulation water tank enters the heat exchanger through the heat exchanger inlet pipe 4j, flows back to the thermal insulation water tank through the heat exchanger outlet pipe 4k, and the biogas slurry in the dry anaerobic fermentation tank 2 passes through The biogas slurry discharge pipe 4n flows to the heat exchanger, after being heated, it flows back to the dry anaerobic fermentation tank through the biogas slurry feeding pipe 4m to mix and stir the materials in the tank, thereby heating the materials in the dry anaerobic fermentation tank . After the material enters the dry-type anaerobic fermentation tank, the material in the dry-type anaerobic fermentation tank is inoculated and the solid content is adjusted by spraying sludge through the pipeline, so that the solid content of the material is 30% to 40%, and the ph value Stay between 6.6-7.2. Through the reasonable connection and work of the air source heat pump, heat preservation water tank, radiator and heat exchanger, using the heat energy provided by the air source heat pump, the dry anaerobic fermentation tank can be realized through the work of the radiator in the dry anaerobic fermentation tank. The thermal insulation of the internal environment can also circulate and heat the biogas slurry through the work of the heat exchanger, thereby efficiently and quickly heating and insulating the materials in the dry anaerobic fermentation tank.

The fermented material is extracted from the dry-type anaerobic fermentation tank and sent to the sludge dehydrator 5a for solid-liquid separation, and the separated biogas residue is stored for further use, and the separated biogas slurry is treated by the sewage processor 5b Sent to the thermal insulation heating system 4 for recycling or sent to the discharge system 7 after the treatment reaches the standard; the sludge generated in the sewage treatment process is then transported to the dry anaerobic fermentation tank for fermentation through pipelines to realize the recycling of resources;

当干式厌氧发酵罐内的压力达到设定值时，压力传感器将信号传送至控制系统，通过控制系统启动气泵把干式厌氧发酵罐内的气体抽出，通过脱水及脱硫等装置送至贮气柜6a内。

When the pressure in the dry-type anaerobic fermentation tank reaches the set value, the pressure sensor transmits the signal to the control system, and the air pump is activated by the control system to pump out the gas in the dry-type anaerobic fermentation tank, and then sent to the Inside the gas storage tank 6a.

The fermentation process is continuous feeding, that is, the dry anaerobic fermentation tank is continuously fed, and the completely decomposed substances are continuously discharged from the bottom of the dry anaerobic fermentation tank. In the first cycle of fermentation (about 25 days), only feed, no discharge. When the first fermentation cycle is completed, feed in and out every day. During the fermentation process, the stirring system realizes intermittent stirring through control. The feeding time is controlled at about 3 to 4 hours to reduce the heat loss caused by feeding; the discharging time is controlled at about 2 hours, and the stirring system stops stirring within two hours before discharging, and after the fermented product is left to stand for two hours, The unfermented material is located in the upper part of the dry anaerobic fermentation tank, and the fermented material (ie biogas residue) is located in the lower part of the dry anaerobic fermentation tank.

During the fermentation process, biogas, biogas slurry, and biogas residue are produced, and the biogas is stored in the gas storage tank, which can provide energy requirements for the system itself and the outside of the system. Part of the biogas slurry produced during the fermentation process is supplied to the material in the dry anaerobic fermentation tank by the thermal insulation heating system to heat and adjust the solid content rate. Part of the biogas slurry and biogas residue are sent to the sludge dehydrator for dehydration, and the solid matter is used for aerobic composting, and finally can be made into organic fertilizer or RDF fuel rods. After the liquid is treated by the sewage processor, it can be provided to the fermentation system as a heating cycle. Water or discharge to the municipal pipe network for reuse.

The invention has been tested and verified by the applicant, has achieved good technical effects and has broad application prospects.

Claims (11)

1. organic waste dry-type anaerobic high temperature fermentation system; It is characterized in that; The dry-type anaerobic fermentation jar (2) that comprises feed system (1), band stirring system (3), insulation heating system (4), liquid natural pond, natural pond slag treatment system (5), exhaust system (6) and system; Said feed system (1) comprises material-storing box (1a), transfer roller (1b), half wet crushing mill (1c), the pretreatment pool (1d) that order is provided with; Said natural pond liquid natural pond slag treatment system (5) comprises through interconnective sludge dewatering equipment of pipeline (5c) (5a) and apparatus for treating sewage (5b); Said exhaust system (6) comprises through pipeline and the tank connected gas-holder of dry-type anaerobic fermentation (6a); The pretreatment pool of feed system (1d) is connected with the opening for feed of dry-type anaerobic fermentation jar (2) through pipeline; Be connected through circulation line between dry-type anaerobic fermentation jar (2) and insulation heating system (4), dry-type anaerobic fermentation jar (2) also passes through pipeline and is connected with apparatus for treating sewage (5b) with the sludge dewatering equipment (5a) of liquid natural pond, natural pond slag treatment system respectively.

2. a kind of organic waste dry-type anaerobic high temperature fermentation system according to claim 1 is characterized in that, apparatus for treating sewage (5b) is connected with insulation heating system (4) through pipeline and perhaps is connected to blowdown system (7).

3. a kind of organic waste dry-type anaerobic high temperature fermentation system according to claim 1; It is characterized in that the stirring system (3) of said dry-type anaerobic fermentation jar (2) comprises from the feed end of dry-type anaerobic fermentation jar and is arranged at five groups of stirring mechanisms the dry-type anaerobic fermentation jar to the discharge end order; Every group of stirring mechanism comprises and is positioned at the outer step-down gear (3a) of dry-type anaerobic fermentation jar, the vertical stir shaft (3b) that is installed on the dry-type anaerobic fermentation jar that is connected with step-down gear, is installed on the agitating vane (3c) on the stir shaft.

4. a kind of organic waste dry-type anaerobic high temperature fermentation system according to claim 3 is characterized in that, at every stir shaft upper edge different heights three groups of agitating vanes (3c) is installed, and adjacent agitating vane is arranged for interlaced 90 °.

5. according to claim 3 or 4 described a kind of organic waste dry-type anaerobic high temperature fermentation systems, it is characterized in that described agitating vane (3c) is the blade of band mesh.

6. according to claim 3 or 4 described a kind of organic waste dry-type anaerobic high temperature fermentation systems, it is characterized in that the top that is positioned at the dry-type anaerobic fermentation jar at stir shaft is equipped with tightness system (3d).

7. a kind of organic waste dry-type anaerobic high temperature fermentation system according to claim 4; It is characterized in that; The agitating vane of topmost partly is positioned on the dry-type anaerobic fermentation jar fermentation liquid level, the agitating vane of bottommost near but do not contact dry-type anaerobic fermentation jar bottom surface.

8. a kind of organic waste dry-type anaerobic high temperature fermentation system according to claim 1; It is characterized in that; The sidewall of dry-type anaerobic fermentation jar (2) bottom (2a) be the scarp of closing up gradually downwards, and the bottom surface of dry-type anaerobic fermentation jar (2) are to inclined-plane that discharge end reduces gradually from feed end.

9. a kind of organic waste dry-type anaerobic high temperature fermentation system according to claim 1; It is characterized in that said heat tracing system (4) comprises cold water storage cistern (4a), air source heat pump (4b), attemperater (4c), scatterer (4d), the interchanger (4e) that is linked in sequence through water pipe (4f); Scatterer (4d) is arranged in the dry-type anaerobic fermentation jar (2); Between air source heat pump (4b) and attemperater (4c), also be connected with backflow water pipe (4g), attemperater (4c) respectively with the radiator inleting pipe that is connected scatterer (4d) (4h) and radiator outlet pipe (4i) and the interchanger water inlet pipe (4j) and the interchanger rising pipe (4k) that are connected interchanger (4e); Interchanger (4e) also is connected with natural pond liquid extraction line (4n) with the natural pond liquid feed-pipe (4m) of the circulation line that is connected the dry-type anaerobic fermentation jar.

10. a kind of organic waste dry-type anaerobic high temperature fermentation system according to claim 1 is characterized in that, gas-holder (6a) front end in exhaust system (6) also is provided with dehydration and desulfurizer (6b).

11. an organic waste dry-type anaerobic high temperature zymotechnique is characterized in that process step is following:

is transported to the treating material in the material-storing box (1a) in half wet crushing mill (1c) through transfer roller (1b) and is crushed to the specification that is not more than 5mm; Be delivered to pretreatment pool (1d) through pipeline; After in pretreatment pool, carrying out 2～3 days acidifying pre-treatment, again product pump is delivered to seal in the dry-type anaerobic fermentation jar (2) and stir and fermentation;

The natural pond liquid that

obtains fermentation is delivered to insulation heating system (4) through pipeline and is heated; Natural pond liquid after the part heating is recycled to the dry-type anaerobic fermentation jar through pipeline again to be stirred with a jar interior mixing of materials; Be heated to 55～60 ℃ to the material in the dry-type anaerobic fermentation jar, the solid holdup of regulating material is 30%～40%;

will ferment material of accomplishing is used to extract out in the dry-type anaerobic fermentation jar and is delivered to sludge dewatering equipment (5a) and carry out solid-liquid separation; The natural pond slag of separating stored wait until further utilization, deliver to the recycle of insulation heating system (4) after the natural pond liquid of separating is handled through apparatus for treating sewage (5b) and perhaps handle and deliver to blowdown system (7) after up to standard; The mud that sewage treatment process produces is transported in the dry-type anaerobic fermentation jar through pipeline and ferments;

is extracted into the gas in the dry-type anaerobic fermentation jar in the gas-holder (6a) through the system booster air pump when the pressure in the dry-type anaerobic fermentation jar reaches set(ting)value.

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