CN109517730A - A kind of half dry type diphasic anaerobic fermentor - Google Patents

Abstract

The present invention has disclosed a semi -dry two -phase aversion fermentation tank, including: hydrolyzed acidized pool is set in the central part of the fermentation tank body, and the circular space between the periphery of the outer peripheral of the hydrolysis pond and the inner wall of the fermentation tank is a circular fermentation space, hydrolyzed acidification The top of the pool is opened with an openings below the tank of the tank body. The hydrolyzed acid pool is connected to the ring fermentation space through the opening of the top; The mixer is located in the ring fermentation space of the periphery of the hydrolysis of the hydrolyzed pond; the side wall of the tank of the fermentation tank body is distributed with a digestive solution overflow pipe, pressure balance pipe and biogas outlets connected to the circular fermentation space; The circulating outlet of the feeder is connected with the digestive liquid overflow pipe and the pressure balance pipe. The fermentation tank is set in the body of anaerobic fermentation tank by setting the hydrolyzed acid pool, which achieves anaerobic two -phase aversion to ensure the independence of the acid phase and the methane phase, and improves the digestive efficiency of anaerobic anaerobic.

Description

A semi-dry two-phase anaerobic fermentation tank

technical field

The invention relates to the field of anaerobic fermentation equipment for treating organic solid waste, in particular to a semi-dry two-phase anaerobic fermentation tank.

Background technique

Organic solid waste mainly includes agricultural solid waste (crop straw, livestock and poultry manure, etc.), industrial waste (expired food, various distiller's grains, bean dregs, etc.), and organic components in municipal solid waste (kitchen waste, kitchen waste, various Perishable garbage and sludge generated by sewage treatment plants, etc.). In recent years, with the acceleration of urbanization and the improvement of people's living standards, the amount of organic solid waste has also increased sharply, and its composition has become increasingly complex. The random discharge of a large amount of organic waste has caused serious pollution to groundwater and the surrounding environment. Using anaerobic The treatment of organic solid waste pollution by fermentation technology has become a necessity for environmental protection and a trend of sustainable social development.

The anaerobic fermentation tank is to use the metabolic activity of microorganisms under anaerobic conditions to stabilize organic solid waste, and at the same time produce CH ₄ , CO ₂ , H ₂ S gas, etc., which is the core equipment for the azoa technology to treat organic solid waste. At present, the mainstream anaerobic fermentation tanks mainly include wet complete mixed anaerobic fermentation tanks (CSTR) and dry push -flowing anaerobic fermentation tanks (PFR), etc., especially in wet -type complete hybrid process; According to the different ingredients in the reaction tank, the tank can be divided into two categories: wet and dry fermentation. The solid rate of wet fermentation materials is between 4 to 10 %, and the solid rate of dry fermentation materials is 25 ～ Between 40%.

Wet fermentation generally adopts a vertical cylinder full-mixing reaction device, because the solid content in the fermentation material is low, the requirement for feed material is high, and the pretreatment is complicated, resulting in a large volume of reaction device required per unit of organic waste and a large area. , high energy consumption, large investment, and low gas production rate per unit volume. Dry fermentation generally adopts a trough-type plug-flow anaerobic reaction device, because the solid content of the material in the fermentation tank is high, and material transportation and mixing are difficult, especially stirring is a technical difficulty, and the design of the material inlet and outlet is also particularly important. The difficulty is high, the process control is extremely complicated, and the equipment cost is high. Due to the poor fluidity of the material, the degradation rate of organic matter is slow, and the gas production rate and gas production efficiency are low.

In general, the process of anaerobic fermentation of organic solid waste to produce methane mainly includes four stages: hydrolysis, acidification, acetogenic and methanogenic. Among them, the hydrolysis and acidification rate is fast, and the pH of the raw material is rapidly reduced to 2-4, while the pH of the stable acidogenic and methanogenic stage is stable at 7-8. There are essential differences in the adaptation conditions of the two types of microbial populations. An efficient and stable anaerobic fermentation methane production process needs to ensure the balance between the hydrolysis acid production process and the acetogenic methanogenesis process. The small molecule organic acids produced in the hydrolysis acid production process can be used by the methanation process in time to avoid the accumulation of organic acids and inhibit The microorganisms in the fermentation system, especially the inhibition of methanogens, because methanogens have a low tolerance to organic acids, and when the concentration of organic acids accumulates to a certain value, the methanogenic activity will be completely inhibited.

However, the traditional anaerobic fermentation adopts an integrated anaerobic fermentation tank, which integrates the hydrolysis acid production process and the acetogenic methane production process in one reactor, so that the microorganisms form a symbiotic relationship, so that in the start-up stage of the tank, the generation cycle of acidifying bacteria is short , the higher concentration of volatile fatty acids has always formed a strong matrix concentration inhibitory and toxic effect on the methanogens with a long generation cycle, resulting in difficulty in the growth of the methanogens, the feed load has remained low for a long time, and the commissioning progress has been slow. The operation and management requirements are very strict. Once the management is neglected, the volatile fatty acids will increase sharply, the pH will drop sharply, and even the anaerobic reaction system will irreversibly collapse and fail. The balance of the anaerobic system is relatively fragile, and the pH buffering capacity is also weak. Affected by feed fluctuations, power outages, temperature, etc., acidification will occur within a few hours, which is difficult to control. Moreover, the biogas output of the integrated fermentation tank fluctuates greatly, and methane The output and concentration are low, and the requirements for stirring are high, and uneven stirring is easy to form local acidification.

SUMMARY OF THE INVENTION

Based on the problems existing in the prior art, the purpose of the present invention is to provide a semi-dry two-phase anaerobic fermentation tank, which can effectively carry out semi-dry anaerobic fermentation of organic wastes with higher solid content, and avoid Effects of organic acid accumulation on methanogens.

The purpose of this invention is to realize through the following technical solutions:

A semi-dry two-phase anaerobic fermentation tank according to the embodiment of the present invention, comprising:

Fermentation tank body, hydrolysis acidification tank, raw material feed pipe, digestive liquid overflow pipe, pressure balance pipe, biogas outlet pipe, side agitator, vertical agitator and circulation discharger; among them,

The fermenter body is a hollow cylinder structure;

The hydrolytic acidification tank is arranged in the central part of the fermenter body, the annular space between the outer periphery of the hydrolytic acidification tank and the inner wall of the fermenter body is an annular fermentation space, and the top of the hydrolysis acidification tank is provided with an opening. The opening is lower than the tank roof of the fermenter body, and the hydrolytic acidification tank communicates with the annular fermentation space in the fermenter body through the opening at the top;

The vertical agitator is arranged in the hydrolytic acidification tank;

The raw material feed pipe communicates with the hydrolytic acidification tank;

The side agitator is arranged in the annular fermentation space in the fermenter body on the periphery of the hydrolytic acidification tank;

The tank side wall of the fermenter body is distributed with the digestive juice overflow pipe, pressure balance pipe and biogas outlet pipe communicating with the annular fermentation space in the fermenter body;

The circulation discharger is arranged outside the fermenter body, the upper end of the circulation discharger is connected with the digestive juice overflow pipe and the pressure balance pipe, and the lower part of the circulation discharger is provided with a discharge pipe.

It can be seen from the above-mentioned technical scheme provided by the present invention that the semi-dry two-phase anaerobic fermentation tank provided by the embodiment of the present invention has the following beneficial effects:

By setting the hydrolytic acidification tank in the anaerobic fermentation tank body, two-phase anaerobic is realized, which not only satisfies the need for hydrolytic acidification and anaerobic fermentation to be carried out in the same environment, but also ensures the independence of the acid-producing phase and the methanogenic phase. , by adjusting the operating parameters of the two units, the two types of microorganisms can work in their respective optimal conditions, which improves the material handling capacity and the stability of the process operation, thereby improving the anaerobic digestion efficiency.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is the elevation view of the internal structure of the semi-dry two-phase anaerobic fermentation tank provided by the embodiment of the present invention;

2 is a top view of the internal structure of the semi-dry two-phase anaerobic fermentation tank provided by the embodiment of the present invention;

Fig. 3 is the external pipeline location diagram of the semi-dry two-phase anaerobic fermentation tank that the embodiment of the present invention provides;

The names of the parts corresponding to the labels in the figure are: 1-fermentation tank body; 11-tank bottom plate; 12-tank side wall; 13-tank roof; 14-raw material feeding pipe; Flow pipe; 17-pressure balance pipe; 18-biogas outlet pipe; 19-emergency vent pipe; 2-hydrolysis acidification tank; 21-pool wall; 22-overflow weir; 3-side agitator; 31-side type Agitator motor; 32-spiral paddle; 33-side agitator shaft; 34-support; 4-heating coil; 5-coil support; 6-vertical agitator; 61-vertical agitator motor; 62-propeller paddle; 7-circulation discharge device; 8-discharge pipe;

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the specific content of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention. Contents that are not described in detail in the embodiments of the present invention belong to the prior art known to those skilled in the art.

As shown in Figures 1 and 2, the embodiment of the present invention provides a semi-dry two-phase anaerobic fermentation tank, comprising:

Fermentation tank body, hydrolysis acidification tank, raw material feed pipe, digestive liquid overflow pipe, pressure balance pipe, biogas outlet pipe, side agitator, vertical agitator and circulation discharger; among them,

The fermenter body is a hollow cylinder structure;

The hydrolytic acidification tank is arranged in the central part of the fermenter body, the annular space between the outer periphery of the hydrolytic acidification tank and the inner wall of the fermenter body is an annular fermentation space, and the top of the hydrolysis acidification tank is provided with an opening. The opening is lower than the tank roof of the fermenter body, and the hydrolytic acidification tank communicates with the annular fermentation space in the fermenter body through the opening at the top;

The vertical agitator is arranged in the hydrolytic acidification tank;

The raw material feed pipe communicates with the hydrolytic acidification tank;

The side agitator is arranged in the annular fermentation space in the fermenter body on the periphery of the hydrolytic acidification tank;

The tank side wall of the fermenter body is distributed with the digestive juice overflow pipe, pressure balance pipe and biogas outlet pipe communicating with the annular fermentation space in the fermenter body;

The circulation discharger is arranged outside the fermenter body, the upper end of the circulation discharger is connected with the digestive juice overflow pipe and the pressure balance pipe, and the lower part of the circulation discharger is provided with a discharge pipe.

In the above fermenter, the fermenter body is a cylindrical structure with a diameter greater than its height; the fermenter body is composed of a tank bottom plate, a tank side wall and a tank roof plate. Preferably, the tank bottom plate, tank side wall and tank roof d structure can be made of reinforced concrete or carbon steel;

In the above fermentation tank, the hydrolytic acidification tank is a hollow cylindrical structure, which is concentrically arranged with the hollow cylindrical structure of the fermentation tank body, and the volume of the hollow cylindrical structure is 1/10 to 1/20 of the capacity of the fermentation tank body ; Preferably, the wall structure of the hydrolytic acidification tank is made of reinforced concrete or carbon steel;

The distance between the opening at the top of the hydrolytic acidification tank and the top plate of the fermenter body is 0.5-2.0 m; the opening at the top of the hydrolysis acidification tank is 0.5-2.0 m higher than the liquid level of the fermented material in the fermenter body during full-load operation. 2.0m;

A ring of overflow weirs is fixed on the opening edge of the top of the hydrolysis acidification tank, the width of the weir body of the overflow weir is 0.2-0.5m, and the included angle between the weir body and the horizontal plane is 30°.

The weir body of the above-mentioned overflow weir adopts an arc-shaped sheet structure.

Specifically, the overflow weir is a stainless steel overflow weir, and the overflow weir is installed on the top of the pool wall in a 30° arc-shaped sheet structure, and the arc edge extends about 0.2 to 0.5m.

In the above fermenter, there are three side agitators, which are evenly distributed in the annular fermentation space in the fermenter body, and the angle between two adjacent side agitators is 120°.

In the above fermenter, the side agitator includes:

frame, side agitator shaft, helical paddle and side agitator motor; of which,

The support is laid between the tank side wall of the fermenter body and the outer wall of the hydrolytic acidification tank;

The side agitator motor is installed on the inner side of the tank side wall of the fermenter body, at one end of the support, the side agitator motor is connected to the side agitator shaft provided on the support, and the side agitator is connected to the side agitator shaft. The helical blades are evenly distributed on the shaft of the side agitator, and the helical blades are spirally arranged around the shaft of the side agitator;

The upper top surface of the spiral blade is higher than the highest liquid level of the fermented material in the fermenter body, and the distance between the lower bottom surface of the spiral blade and the bottom plate of the fermenter body is less than or equal to 300mm.

In the above fermenter, the opening of the digestive juice overflow pipe on the tank side wall of the fermenter body is located at 0-1.0m below the liquid surface of the fermentation material in the fermenter body, and the digestive juice overflows The mouth of the flow tube in the fermenter body is located at 1/2 to 2/3 of the liquid level of the fermented material;

The pressure balance pipe is located directly above the digestive juice overflow pipe, and the opening of the pressure balance pipe connected to the tank side wall of the fermentation tank body is located at 0-1.0m above the fermentation material liquid surface;

The opening of the biogas outlet pipe is located on the side wall of the tank at a position 1.0 m above the liquid level of the fermentation material.

The above-mentioned fermenter also includes: an emergency vent pipe, the opening of the tank side wall connected to the fermenter body is located at a position 0.5-2.0m above the tank bottom of the fermenter body, and the emergency vent pipe is located at the The nozzle inside the fermenter body is located at the discharge pit on the bottom of the tank.

In the above-mentioned fermenter, the inner side wall of the fermenter body and the outer periphery of the tank wall of the hydrolysis acidification tank are symmetrically and uniformly arranged with heating coil assemblies. Preferably, the heating coil assembly is composed of a coil bracket and a heating coil. Specifically, the coil bracket is arranged symmetrically and evenly on the inner side of the tank side wall and the outer periphery of the pool wall of the hydrolysis acidification tank, and the coil bracket is installed on the coil bracket for material heating and heat preservation. The required heating tray.

In the above fermentation tank, the raw material feeding pipe is connected to the hydrolysis acidification tank from the bottom of the fermenting tank body; further, it also includes: a sand discharge pipe, the raw material feeding pipe is connected with the sand discharge pipe in the form of a tee outside the fermentation tank body The tubes merge into one pipe leading to the center of the tank floor.

The circulating discharger is a closed cylindrical structure, preferably made of stainless steel or carbon steel anti-corrosion material, which can store a certain amount of overflow digestive juice, and is convenient to discharge through the discharge pipe.

The above-mentioned vertical agitator installed in the hydrolytic acidification tank is one, which is composed of a vertical agitator motor and a propeller blade, and the vertical agitator motor is located at the center outside the tank roof of the fermentation tank body.

The semi-dry type two-phase anaerobic fermentation tank provided by the invention can effectively carry out semi-dry type two-phase anaerobic fermentation on organic wastes with a relatively high solid content (10-25%), and at the same time, in order to avoid the accumulation of organic acids on the production In order to avoid the influence of methane bacteria, a two-phase anaerobic fermentation process is set up to improve the efficiency of anaerobic digestion. Compared with the prior art, the semi-dry two-phase anaerobic fermentation tank of the present invention has at least the following beneficial effects:

(1) Strong raw material adaptability and high fermentation concentration: the invention is suitable for anaerobic fermentation treatment of various organic solid wastes. The fermentation concentration is generally 8-30%, preferably 10-25%. The organic matter load is high, and the system The impact load is strong.

(2) Strong system stability and high fermentation efficiency: Two-phase anaerobic is adopted, and the hydrolytic acidification tank is set in the anaerobic fermentation tank body, which not only satisfies the need for hydrolytic acidification and anaerobic fermentation to be carried out in the same environment, but also ensures the production The independence of the acid phase and the methanogenic phase, by adjusting the operating parameters of the two units, the two types of microorganisms can work in their respective optimal conditions, which improves the material handling capacity and the stability of the process operation, thereby improving the system efficiency. Aerobic and digestion efficiency.

(3) Good feed uniformity and high stirring efficiency: The feed to the anaerobic tank is that the material after hydrolysis and acidification is evenly distributed around the hydrolysis and acidification tank through the overflow of the overflow weir, which achieves the purpose of uniform feeding. In addition to the longitudinal stirring effect, the side agitator also forms an axial propulsion during the stirring process, and the stirring and mixing effect is good. Since there is no fermentation raw material in the middle position of the fermenter body, compared with the traditional stirring method, it avoids the phenomenon of stirring dead angle in the center of the traditional fermenter body, and the stirring efficiency is high.

(4) Good heat preservation effect and low floor space: By symmetrically and evenly arranging the heating coils on the inner side of the tank side wall and the outer periphery of the hydrolytic acidification tank wall, the combination of the inside and outside can quickly heat and keep the material warm. The hydrolytic acidification tank is set in the anaerobic fermentation tank, which can effectively save the occupied area.

The embodiments of the present invention will be further described in detail below.

As shown in Figure 1, Figure 2 and Figure 3, the embodiment of the present invention provides a semi-dry two-phase anaerobic fermentation tank, including: a fermentation tank body 1, a hydrolytic acidification tank 2, a side agitator 3, a vertical agitator Device 6, circulation discharger 7, etc.

The fermentation tank body 1 is a chunky cylinder, including a tank bottom plate 11, a tank side wall 12 and a tank top plate 13, all of which are made of reinforced concrete or carbon steel.

As shown in Figure 2, three side agitators 3 are evenly installed on the fermenter body 1, each at an angle of 120°. 32 and a bracket 34, and the rotation speed of the side agitator 3 is generally controlled at 2 to 10 rpm/min.

As shown in Figure 1, the side agitator motor 31 is installed on the outside of the side wall 12 of the tank, and the spiral paddles 32 are evenly distributed on the side agitator shaft 33 and spiral around the side agitator shaft 33. The layout is convenient to play the role of vertical stirring when stirring, and at the same time form the axial propulsion.

During the stirring process of the spiral paddle 32, the top surface of the paddle is guaranteed to be higher than the maximum liquid level of the fermentation material, which is convenient for breaking the scum that may be generated on the surface of the raw material, and the distance between the bottom surface of the paddle and the bottom of the tank is guaranteed to be ≤300mm, which is convenient for the During the stirring process, the deposited sediment is better mixed with the fermented material and discharged with the digestive juice to prevent precipitation.

As shown in FIG. 3 , the tank side wall 12 is provided with a digestive liquid overflow pipe 16 , a pressure balance pipe 17 , a biogas outlet pipe 18 and an emergency vent pipe 19 . The opening of the digestive juice overflow pipe 16 on the side wall 12 of the tank is located at 0-1.0 m below the liquid level of the fermented material, and the inner nozzle is located at 1/2-2/3 of the liquid level below the liquid level of the fermentation tank.

The pressure balance pipe 17 is located directly above the digestive fluid overflow pipe, and the opening of the side wall 12 of the tank is located at 0-1.0 m above the liquid level.

The opening of the biogas outlet pipe 18 is located on the side wall 12 of the tank and at a position above 1.0 m from the liquid surface of the fermentation material. The opening of the emergency vent pipe 19 on the tank side wall 12 is located 0.5-2.0m above the tank bottom plate 11, and the internal nozzle is located at the discharge pit of the tank bottom plate 11 to ensure that the material can be completely discharged under emergency conditions.

The raw material feed pipe 15 and the sand discharge pipe 15 are arranged below the bottom plate 11 of the tank, and the feed pipe 14 merges with the sand discharge pipe 15 in the form of a three-way outside the fermentation tank body 1 to form a pipeline leading to the center of the bottom plate 11, which is convenient for fermentation The raw materials are transported to the hydrolytic acidification tank 2; at the same time, the sediment in the hydrolytic acidification tank 2 is drawn out through a common pipeline and discharged from the sand discharge pipe 15 during the sand discharge process.

As shown in Figures 1 and 2, coil support 5 is arranged symmetrically and evenly on the inner side of tank side wall 12 and the outer circumference of the pool wall 21 of the hydrolysis acidification tank 2, and the heating coil 4 required for material heating and heat preservation is installed.

The hydrolysis and acidification tank 2 is located in the center of the fermentation tank body 1, forming a concentric cylinder without a cover with the fermentation tank body 1. The volume is 1/10 to 1/20 of the capacity of the fermentation tank body 1, ensuring that the total amount of new materials every day does not exceed the hydrolysis and acidification 1/2 of the total capacity of the pool 2, the material stays in the hydrolytic acidification pool 2 for 1.0-2.0 days to complete the hydrolysis and acidification process, and generates a large amount of small molecular organic acid products. The pool wall 21 structure of 2 is reinforced concrete or carbon steel material.

The height of the pool wall 21 is about 0.5-2.0m from the tank top plate 13, and 0.5-2.0m higher than the liquid surface of the fermentation material. There is a ring of stainless steel overflow weir 22 on the top edge of the pool wall 21, and the overflow weir 22 is in the shape of a 30° arc The flaky structure is installed on the top of the pool wall 21, and the arc-shaped edge extends about 0.2-0.5m, which is convenient for the normal overflow of materials. Prevent the long-term overcurrent erosion and corrosion at the top of the pool wall 21, and reduce the impact force directly flowing down on the peripheral heating coil 4.

As shown in FIG. 1 and FIG. 2 , a vertical agitator 6 is installed inside the hydrolysis acidification tank 2 , including a vertical agitator motor 61 and a propeller blade 62 . The motor 61 of the vertical agitator is located at the center outside the top plate 13 of the tank, the rotation speed of the vertical agitator 6 is generally controlled at 10-30 rpm/min, and the stirring cycle is 20-40 minutes per hour.

As shown in Figure 3, the circulating discharger 7 is a closed cylindrical structure made of stainless steel or carbon steel for anti-corrosion, and can store a certain amount of overflow digestive juice. The upper end is connected with the pressure balance pipe 17 and the digestive juice overflow pipe 16. The lower part is provided with a discharge pipe 8, and the digestive liquid output from the discharge pipe 8 can be directly transported to the subsequent solid-liquid separation unit, and can also be returned to the feed unit for back-mixing inoculation or preheating of the material if necessary.

The two-phase anaerobic fermentation treatment process that the semi-dry type two-phase anaerobic fermentation tank of the present invention carries out is described in detail below with a specific embodiment:

The collected raw materials of multiple compound organic solid wastes are simply crushed, removed, and the concentration is adjusted to 10-20% for later use. When the fermenter is started for the first time, fresh cow dung is added to the hydrolytic acidification tank 2 from the feed pipe 14, and the concentration of the cow dung material is adjusted at about 8%, and the temperature is kept at 37±1°C by heating and heating. Under the action of stirring, cultivate for 5 to 7 days to obtain the fecal flora culture solution.

The pretreated raw materials are transported to the hydrolysis acidification tank 2 through the feeding pipe 14 through the conveying equipment, and the materials are stirred by the vertical mixer 6 to fully mix the new materials and the fecal flora culture solution until the completion of the process. Hydrolysis process. The speed of the vertical mixer 6 is generally controlled at 10-30rpm/min, and the stirring cycle is 20-40min per hour. The total amount of new materials every day does not exceed 1/2 of the total capacity of the hydrolysis acidification tank 2, and the materials are in the hydrolysis acidification tank 2 Stay for 1.0-2.0 days to complete the hydrolysis and acidification process. During the feeding process, the vertical agitator 6 is not started to ensure that the new material is in the bottom layer of the hydrolytic acidification tank 2, and the upper layer material after equal volume hydrolysis and acidification is evenly distributed and overflowed from the overflow weir 22 by squeezing the top. Aerobic fermentation tank body 1. The unspilled hydrolytic acidification solution is rich in a large number of hydrolytic acidification bacteria, which can provide the best reaction conditions and microbial populations for the hydrolysis and acidification of new materials. Under the agitation of the side agitator 3, the new materials are fully mixed and inoculated , to complete the hydrolysis and acidification process to generate small molecular organic acids and other components.

The material completed by hydrolyzed acidification enters the anaerobic fermentation tank body 1, and controls the temperature of the fermented material at a temperature of 30 ～ 38 ℃ or the high temperature is 45-55 ℃. The material of the material is fastened by 15-30 days under the stirring of the side mixer 3. In the process of oxygen fermentation, the organic matter of the material is degraded in large quantities, and at the same time, CH ₄ , H ₂ O, CO ₂ , etc. are generated, and the biogas gas is collected in the biogas storage system through biogas.

The digested liquid after anaerobic fermentation enters the circulating discharger 7 through the digested liquid overflow pipe 16, and then is discharged through the discharge pipe 8. The digested liquid can be directly transported to the subsequent solid-liquid separation unit, and can also be returned to the feed if necessary. The unit is used for back-mixing inoculation or preheating of materials.

When the sedimentation in the hydrolytic acidification tank reaches a certain thickness, start the vertical agitator 6, close the valve at the front end of the feed pipe 14, and open the valve of the sand discharge pipe 15 at the same time, and the sedimentation will be automatically discharged to the outside of the fermentation tank for sedimentation by the water pressure in the tank Inside the pool.

When the anaerobic fermentation process encounters an emergency or requires overall maintenance, the valve of the emergency vent pipe 19 is opened, and the material can be completely discharged.

The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Any person skilled in the art can easily think of changes or Substitutions should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. A semi-dry two-phase anaerobic fermentation tank, characterized in that, comprising: Fermentation tank body, hydrolysis acidification tank, raw material feed pipe, digestive liquid overflow pipe, pressure balance pipe, biogas outlet pipe, side agitator, vertical agitator and circulation discharger; among them, The body of the fermented tank is a hollow cylindrical structure; The hydrolytic acidification tank is arranged in the central part of the fermenter body, the annular space between the outer periphery of the hydrolytic acidification tank and the inner wall of the fermenter body is an annular fermentation space, and the top of the hydrolysis acidification tank is provided with an opening. The opening is lower than the tank roof of the fermenter body, and the hydrolytic acidification tank communicates with the annular fermentation space in the fermenter body through the opening at the top; The vertical agitator is arranged in the hydrolytic acidification tank; The raw material feed pipe communicates with the hydrolytic acidification tank; The side mixer is located in the ring fermentation space of the fermented tank body of the fermentation tank outside the peripheral of the hydrolyzed acid; The tank side wall of the fermenter body is distributed with the digestive juice overflow pipe, pressure balance pipe and biogas outlet pipe communicating with the annular fermentation space in the fermenter body; The circulation discharger is arranged outside the fermenter body, the upper end of the circulation discharger is connected with the digestive juice overflow pipe and the pressure balance pipe, and the lower part of the circulation discharger is provided with a discharge pipe. 2. semi-dry type two-phase anaerobic fermentation tank according to claim 1, is characterized in that, described fermentation tank body is the cylinder structure that diameter is greater than height; This fermentation tank body is made up of tank bottom plate, tank side wall and tank The top plate composition. 3. The semi-dry two-phase anaerobic fermentation tank according to claim 1, wherein the hydrolytic acidification tank is a hollow cylindrical structure concentrically arranged with the hollow cylindrical structure of the fermentation tank body, and the hollow The volume of the cylindrical structure is 1/10 to 1/20 of the capacity of the fermenter body; The distance between the opening at the top of the hydrolytic acidification tank and the tank roof of the fermenter body is 0.5-2.0m; A ring of overflow weirs is fixed on the opening edge of the top of the hydrolysis acidification tank, the width of the weir body of the overflow weir is 0.2-0.5m, and the included angle between the weir body and the horizontal plane is 30°. 4. The semi-dry two-phase anaerobic fermentation tank according to claim 3, characterized in that, the weir body of the overflow weir adopts an arc-shaped sheet structure. 5. The semi-dry two-phase anaerobic fermenter according to any one of claims 1 to 4, characterized in that, there are three side agitators, which are evenly distributed and arranged in the ring-shaped fermenter body. In the fermentation space, the angle between two adjacent side mixers is 120 °. 6. semi-dry type two-phase anaerobic fermentation tank according to claim 5, is characterized in that, described side agitator comprises: frame, side agitator shaft, helical paddle and motor; of which, The support is laid between the tank side wall of the fermenter body and the outer wall of the hydrolytic acidification tank; The motor is installed on the inner side of the tank side wall of the fermenter body, at one end of the bracket, and the motor is connected to the shaft of the side agitator arranged on the bracket, and the shaft of the side agitator is evenly distributed The spiral slurry leaves, the spiral pulp leaves are arranged by the side -type mixer shaft; The upper top surface of the spiral blade is higher than the highest liquid level of the fermented material in the fermenter body, and the distance between the lower bottom surface of the spiral blade and the bottom plate of the fermenter body is less than or equal to 300mm. 7. The semi -dry two -phase aversion fermentation tank according to claim 1 is characterized by The opening of the digestive juice overflow pipe on the tank side wall of the fermenter body is located at 0-1.0m below the liquid surface of the fermented material in the fermenter body, and the digestive juice overflow pipe is located in the fermenter body. The nozzle in the fermenter body is located at 1/2 to 2/3 of the liquid level of the fermented material; The pressure balance pipe is located directly above the digestive juice overflow pipe, and the opening of the pressure balance pipe connected to the tank side wall of the fermentation tank body is located at 0-1.0m above the fermentation material liquid surface; The opening of the biogas out of the trachea is located on the side wall of the tank above 1.0m of the fermentation material liquid. 8. The semi-dry two-phase anaerobic fermentation tank according to claim 1 or 7, further comprising: an emergency vent pipe, the opening of the side wall of the tank connected to the fermentation tank body is located at the The position of 0.5-2.0m above the tank bottom of the fermenter body, the nozzle of the emergency vent pipe inside the fermenter body is located at the discharge pit of the tank bottom. 9. The semi-dry two-phase anaerobic fermenter according to any one of claims 1 to 7, wherein the inside of the tank side wall of the fermenter body and the periphery of the wall of the hydrolytic acidification tank are all symmetrical Uniformly arrange the heating disk component. 10. The semi-dry two-phase anaerobic fermenter according to any one of claims 1 to 7, wherein the raw material feed pipe is connected to the hydrolytic acidification tank from the bottom of the fermenter body; The cyclic material is a closed cylindrical structure.