CN110760433A - Dry anaerobic fermentation and organic fertilizer fermentation integrated system - Google Patents

Abstract

The invention discloses an integrated system of dry anaerobic fermentation and organic fertilizer fermentation; the system comprises an anaerobic fermentation tank and an organic fertilizer aerobic fermentation tank which are connected to each other; The inclination direction of the inclined tank wall at the top of the fertilizer aerobic fermentation tank is opposite; the upper part of the anaerobic fermentation tank is provided with a raw material feeding port, a biogas liquid feeding port and a biogas outlet, and the bottom of the anaerobic fermentation tank is inclined from the upper end of the tank wall to the lower end. A biogas residue outlet, a biogas injection inlet and a biogas liquid outlet are sequentially opened; a biogas residue inlet, an aerobic fermentation bacterial agent inlet and a waste gas outlet are arranged on the inclined tank wall at the top of the organic fertilizer aerobic fermentation tank; the biogas residue outlet passes through The biogas residue discharging device is communicated with the biogas residue inlet; the present invention is composed of an anaerobic fermentation tank system and an organic fertilizer fermentation system; realizes the synergistic production of anaerobic fermentation biogas production and aerobic fermentation production of organic fertilizer, and increases the operability of the device. Reduce labor intensity and improve production efficiency.

Description

Dry anaerobic fermentation and organic fertilizer fermentation integrated system

technical field

The invention relates to the field of fermentation, in particular to an integrated system of dry anaerobic fermentation and organic fertilizer fermentation.

Background technique

The output of organic solid waste is huge and the content of organic matter is high. Direct discharge will seriously pollute the environment. The use of biological means such as anaerobic fermentation can realize the energy utilization of organic solid waste. Dry anaerobic fermentation technology plays a particularly important role in the field of biological engineering. role, especially in the production and utilization of biogas and organic fertilizers.

With the increasing number of agricultural straw, domestic waste, livestock and poultry manure, etc., the pressure on the environment and energy is increasing, and the utilization of biomass resources has become an urgent need. Anaerobic fermentation technology is one of the hot spots and key directions of research at home and abroad. According to the different states of biomass substrates, anaerobic fermentation technology can be divided into wet and dry anaerobic fermentation. Dry anaerobic fermentation uses solid organic waste (its total solid concentration TS reaches 20% to 30%) as raw material, in the absence or almost no free flowing water and anaerobic conditions, through facultative and obligate anaerobic microorganisms The combined effect of the biogas fermentation process, which eventually generates gases such as _CO2 and _CH4 , is a new waste recycling method.

Dry anaerobic fermentation usually means that the dry matter content of the fermentation raw material is 20% to 40%, the raw material is solid, no sewage is generated during the treatment process, and there is no problem of digesting biogas slurry. The fermentation residue can be made into organic fertilizer, basically To achieve zero pollutant emissions, while the economic benefits are better, the energy is a positive effect.

Compared with wet anaerobic digestion, although dry anaerobic digestion of organic waste has many advantages and benefits, there are still many difficulties in its popularization and application. First, the high concentration of the reaction matrix makes it difficult to transfer and diffuse reaction intermediates and energy in the medium, thereby forming feedback inhibition. Second, the structure, composition and particle size of the reaction matrix are inhomogeneous, which makes the system operation difficult to control and the continuous operation is unstable. Third, the stirring resistance is large, making it difficult to stir and mix the matrix.

The biogas dry anaerobic fermentation technology with organic solids as the main raw material has many advantages and benefits, but it also has the disadvantages of long start-up time, unstable fermentation process and long cycle, incomplete stirring, easy to produce acidosis, and suffering in cold areas. temperature and many other issues.

In the field of organic fertilizer fermentation, the current large-scale organic fertilizer fermentation basically adopts the open workshop, and the method of stacking and stacking mechanical turning and throwing oxygen supply fermentation. It is difficult to handle, so a lot of research and practice have turned to closed fermentation. The more representative one is closed drum fermentation, which uses fixed-point oxygen supply in the tank and long-axis propelling stirring to improve the effect of oxygen supply. Organic fertilizer fermentation The process needs to add inoculants. This kind of process generally adds inoculants in the material feeding system at one time. However, the main problem of this type of fermentation is that the agitator is easy to form a stirring dead angle. The lack of oxygen supply leads to insufficient decomposed organic matter, which affects the quality of organic fertilizer. , At the same time, the bacterial agent is added at one time, and the activity of the bacterial agent is greatly reduced in the late stage of aerobic fermentation, which affects the fermentation efficiency.

The Chinese invention patent application number 201410649573.7 discloses a stirring device for dry anaerobic fermentation, using a long-shaft agitator, but the size and length of large-scale anaerobic fermentation tanks often exceed 10m, and even reach 30-50m, Therefore, after the production capacity of the large dry anaerobic fermentation tank is increased, the diameter of this single-shaft agitator will also increase, and the shaft of the single-shaft bears a huge moment, so the mechanical strength of a single long shaft is extremely high, and the stirring The production cost of the agitator is not low, and the failure rate is high, and the stirring effect is not ideal; at the same time, during the operation of the long-shaft agitator, the axial thrust of the agitator is used to push the material forward evenly, and the anaerobic fermentation is carried out. The material residence time is uncontrollable during the coaxial progressive push of the tank to move the material. However, in fact, the residence time of the materials in the three stages of the anaerobic fermentation of organic matter for methane production is different. If the fermentation efficiency of the biogas production stage is guaranteed, the residence time needs to be increased. The residence time is too long, and the hydrolysis of anaerobic fermentation and During the acid production stage, the activity of anaerobic bacteria will decrease or even die, which will affect the fermentation efficiency. This inhibitory effect is more obvious for high-concentration dry anaerobic fermentation; if the residence time is too short, it will affect the gas production rate in the gas production stage. . Therefore, the single long-axis propellant stirring cannot solve the problem of uncoordinated residence time in the process of anaerobic fermentation to produce biogas.

The two Chinese invention patents with application numbers of 201821796767.X and 201821791730.8 use three sets of series connection methods to simulate the three stages of hydrolysis, acid production and biogas production in the anaerobic biogas fermentation process. It can solve the above-mentioned long-axis material problems and agitator problems to a certain extent, and also creatively solve the three-stage residence time problem, but this technology ignores the biogas slurry circulation problem, and also avoids the fermentation agent in the dry anaerobic fermentation process. Inoculation problem, dry anaerobic fermentation system is not used in low-concentration wet fermentation processes such as CSTR, the retention rate of fermentation bacteria in the reactor is very low, and almost all anaerobic bacteria enter the post-processing link of biogas residue during the propulsion process. The anaerobic bacteria of the technology are all supplemented by the feeding link, and supplementing the inoculum will increase the operating cost. The main structure of the reactor used by this technology is square, but the agitator adopts a plow-shaped stirring blade, and the blade is directly welded on the stirring shaft. In addition, due to its own structure and welding process problems, the disturbance radius of the agitator is not large. The anaerobic reactor made by this technology is difficult to manufacture large-scale reactors, which makes it difficult to increase the production capacity. Over time, the working efficiency of anaerobic reactor is getting lower and lower.

At present, there are few dry fermentation supporting organic fertilizer integrated fermentation equipment, and the output concentration of dry anaerobic fermentation is high. After using the solid-liquid separation device of the discharge system, the biogas residue can directly enter the aerobic fermentation stage to produce organic fertilizer. The Chinese invention patent with the application number of 201811040899.4 discloses a dry anaerobic fermentation supporting organic fertilizer device and use method. The technology focuses on using the heat generated in the aerobic stage to heat the materials in the anaerobic tank to achieve the effect of collaborative fermentation , but lacks creativity in other aspects of aerobic fermentation, for example, how to achieve better oxygen supply and improve aerobic fermentation efficiency; Fermentation agents and other aspects are not creative. Most closed drum fermentation tanks cannot achieve effective stirring, forming a stirring dead angle. At the same time, for example, in the prior art ZL201610006946.8, some common sense has been made on the air supply system of the closed drum organic fertilizer fermentation device, but this single point The method of spraying air cannot completely solve the problem of oxygen supply and stirring dead angle in the high aerobic zone.

Although the closed organic fertilizer fermentation tank can solve the problem of collecting the fermentation waste gas (odor) in the current open workshop, the existing technology has not solved the problem of adding bacterial agents in closed aerobic fermentation and the treatment of fermentation waste gas (odor). question.

SUMMARY OF THE INVENTION

The object of the present invention is to overcome the deficiencies of the prior art, and provides a dry anaerobic fermentation and organic fertilizer fermentation integrated system; this system solves the following problems:

1) Solve the problems of difficulty in making long-shaft agitators and difficulty in expanding production capacity in the process of anaerobic fermentation;

2. Solve the problems of insufficient hydrolysis of local materials, excessive acidification, and reduced activity of anaerobic bacteria caused by accumulation of ammonia nitrogen due to the uncontrollable residence time of single-stage propellant stirring materials;

3) The biogas pressurized injection system is used in the anaerobic fermenter, which further impacts on the dead corners of stirring, and eliminates these dead corners of stirring, which can reduce the problems of excessive local acidification and accumulation of ammonia nitrogen;

4) Solve the problem of making long-axis agitators in the prior art, the problem of insufficient material stirring, and the problem of easy formation of dead ends in the stirring process; the fermentation process of organic fertilizer mainly solves the difference in the amount of bacteria and air required by different fermentation stages;

In order to achieve the above purpose, the present invention designs an integrated system of dry anaerobic fermentation and organic fertilizer fermentation. The system includes interconnected anaerobic fermentation tanks and organic fertilizer aerobic fermentation tanks. The inclined tank wall is opposite to the inclined direction of the inclined tank wall at the top of the organic fertilizer aerobic fermentation tank; the upper part of the anaerobic fermentation tank is provided with a raw material feeding port, a biogas liquid feeding port and a biogas outlet, and the raw material feeding port is connected with a A raw material feeder, the anaerobic fermentation tank includes a plurality of stirring shafts hinged in parallel; both ends of the stirring shaft are respectively installed on both side walls of the anaerobic fermentation tank; and one end of the stirring shaft passes through the anaerobic fermentation tank and The external motor is connected; a plurality of agitators are arranged at intervals on the stirring shaft; the biogas residue outlet, the biogas injection inlet and the biogas liquid outlet are sequentially opened from the upper end to the lower end of the inclined tank wall at the bottom of the anaerobic fermentation tank; the biogas outlet passes through The pipeline is respectively connected with the biogas purification device and the biogas injection inlet; the biogas slurry outlet is respectively connected with the biogas slurry treatment device and the biogas slurry feed port through the pipeline; biogas slurry is respectively provided on the tank wall of the anaerobic fermentation tank above and below the agitator a liquid inoculum spray system and a biogas injection system; the biogas liquid inoculum spray system and the biogas injection system are respectively communicated with the biogas liquid feed inlet and the biogas injection inlet;

A biogas residue inlet, an aerobic fermentation bacterial agent inlet and an exhaust gas outlet are arranged on the inclined tank wall at the top of the organic fertilizer aerobic fermentation tank; the biogas residue outlet is communicated with the biogas residue inlet through a biogas residue discharge device; the aerobic The fermentation bacterial agent inlet is connected with an aerobic fermentation bacterial agent storage tank and a biological deodorant storage tank through a pipeline; the organic fertilizer aerobic fermentation tank includes an aerobic stirring shaft hinged at both ends of the organic fertilizer aerobic fermentation tank; the One end of the aerobic stirring shaft passes through and is connected to an external motor; a plurality of aerobic stirrers are arranged on the aerobic stirring shaft at intervals; the bottom of the organic fertilizer aerobic fermentation tank is provided with an air inlet; the organic fertilizer aerobic The upper part of the tank wall at one end of the fermentation tank is provided with an organic fertilizer discharge pipe; the tank wall of the organic fertilizer aerobic fermentation tank above and below the aerobic stirring shaft is respectively provided with an aerobic fermentation bacterial agent spray system/biological bacteria spray system and Air injection system; the aerobic fermentation bacteria agent spray system/biological bacteria spray system and the air injection system are respectively communicated with the aerobic fermentation bacteria agent inlet and the air inlet.

Further, the top wall of the anaerobic fermentation tank is provided with a plurality of fermented material physicochemical property detection devices and anaerobic tank positive and negative pressure protection devices (to prevent the pressure in the tank from being too large or the pressure in the tank caused by the discharge of materials being too low, which is harmful to the fermentation process. can damage).

Still further, the stirrer is in one-to-one correspondence with the upper fermentation material physicochemical property detection device. (The detection data of the physicochemical characteristics detection device of the fermentation material, the data is input into the computer, the computer controls the stirring intensity of the stirrer through the controller, and the data of the detection device can also be input into the computer, and the computer controls the opening of the upper and lower spray systems through the controller. or not and opening strength).

Still further, the bottom wall of the organic fertilizer aerobic fermentation tank is provided with a plurality of detection devices for physicochemical properties of fermentation materials; the aerobic stirrer corresponds to the detection device for physicochemical properties of fermentation materials below (detection device for physicochemical properties of fermentation materials). Test data, input the data into the computer, the computer controls the stirring intensity of the stirrer through the controller, or the data from the detection device, the data is input into the computer, and the computer controls the opening or not and the opening intensity of the upper and lower sprinkler systems through the controller).

Still further, the pipeline between the biogas outlet and the biogas purification device is provided with a biogas purification device valve, and the pipeline between the biogas outlet and the biogas injection inlet is sequentially provided with a temporary storage tank valve, a biogas temporary storage tank, The booster fan valve, the biogas booster fan and the biogas booster fan outlet valve; the pipeline between the biogas slurry outlet and the biogas slurry treatment device is provided with a biogas slurry outlet valve and a biogas slurry treatment device valve; the biogas slurry outlet A biogas slurry outlet valve, a biogas slurry nitrogen removal device, an outlet valve of the ammonia nitrogen removal device, a biogas slurry (circulating liquid) delivery pump and a biogas slurry (inoculation liquid) check valve are arranged in sequence on the pipeline between the biogas slurry feed port and the biogas slurry feed port.

Still further, a fermentation inoculum control valve, a biological deodorant control valve and an inlet main valve are arranged on the pipelines between the aerobic fermentation inoculant inlet, the aerobic fermentation inoculant storage tank and the biological deodorant storage tank.

Still further, an air pipe is connected to the air inlet, and air valves, a biogas booster pump and a bottom valve are sequentially arranged on the air pipe.

Further, the number of the stirring shafts is 3, which are respectively a hydrolysis stirring shaft, an acidifying stirring shaft and a gas producing stirring shaft; The areas near the agitators focus on three stages of hydrolysis, acidification and biogas production of organic materials. The opening time and stirring speed of the three groups of agitators can be individually controlled, and the corresponding physicochemical properties of each fermentation material are controlled by the detection data of the detection device. The switch and stirring intensity of the motor of the stirrer can achieve precise control of the three stages of hydrolysis, acid production and gas production);

Further, the stirrer and the aerobic stirrer are formed of rice-shaped or cross-shaped stirring paddles; the paddles of the stirring paddles are corrugated (when the stirring paddles are stirred, the The length distribution of the liquid level is in a corrugated shape; (the rice-shaped agitator for the hydrolysis agitator can increase the stirring intensity, which is beneficial to increase the hydrolysis effect of the material near the hydrolysis agitator. The rotating speed of the group agitators can be adjusted according to the needs of the process, which can effectively change the residence time of the three stages of hydrolysis, acidification and biogas production of organic materials. So as to ensure the effects of hydrolysis, acidification and biogas production); the hydrolysis The diameters of the blades of the agitator, acidifying agitator and gas producing agitator are the same or gradually decrease with the slope of the anaerobic tank (the three agitators can be rotated clockwise or counterclockwise to facilitate the flow of materials from the anaerobic reactor. Push left to right for continuous fermentation).

Still further, the biogas slurry inoculum spraying system, the biogas spraying system, the aerobic fermentation bacterial agent spraying system/biological bacteria spraying system and the air spraying system all include uniformly distributed or non-uniformly distributed spray nozzles. The spray nozzle is a convex short pipe; and one end of the short pipe is welded with a steel plate drilled with a spray hole or welded with a wire mesh; ); the exhaust gas outlet is communicated with an external exhaust gas treatment device.

Beneficial effects of the present invention:

1) The present invention is composed of an anaerobic fermentation tank system and an organic fertilizer fermentation system; realizes the collaborative production of anaerobic fermentation biogas production and aerobic fermentation production of organic fertilizer, increases the operability of the device, reduces labor intensity, and improves production efficiency;

2) The bottom of the anaerobic fermentation tank of the present invention is inclined, and the biogas slurry is discharged by itself, which solves the problem of the accumulation of biogas slurry in the flat-bottomed anaerobic fermentation tank or the problem that the biogas slurry cannot be completely eliminated;

3) The distribution of the injection ports of the biogas injection system of the present invention can be uniformly distributed or non-uniformly distributed according to the difference of the materials, so as to meet the fermentation requirements of different materials;

4) In the present invention, the biogas slurry is returned to the system for inoculation after passing through the ammonia nitrogen removal system, which can avoid the problem of bacterial inactivation or even death caused by the continuous accumulation of ammonia nitrogen caused by direct reflux in the prior art;

5) The distribution of the injection ports of the biogas slurry reflux injection system in the present invention can also be uniformly distributed or non-uniformly distributed according to the difference of materials, so as to meet the fermentation requirements of different materials;

6) In the present invention, the spray system at the upper end of the aerobic organic fertilizer fermentation tank can intermittently add inoculants required for fermentation and deodorant biological agents in the process of fermentation waste gas treatment (deodorization), and the air spray system can also work continuously and intermittently to improve fermentation. efficiency.

7) The present invention adopts three groups of agitators, and a device for detecting the physicochemical properties of the fermented material is arranged above the working area of the three groups of agitators, by analyzing and detecting the physicochemical properties of the fermentation material in the three stages of anaerobic fermentation, and then using these data. Control the opening time and intensity of the agitator in three stages, so as to achieve precise control and adjustment of anaerobic fermentation, and maximize the gas production rate of raw materials.

Description of drawings

Fig. 1 is the schematic diagram of dry anaerobic fermentation and organic fertilizer fermentation integrated system of the present invention;

Fig. 2 is the sectional view of anaerobic fermentation tank;

Figure 3 is a shape diagram of a stirring blade;

Fig. 4 is the schematic diagram that stirring blade forms rice-shaped agitator;

5 is a schematic diagram of a cross-shaped agitator formed by a stirring blade;

6 is a schematic diagram of the uniform distribution of jet nozzles;

Fig. 7 is the schematic diagram of the non-uniform distribution of jet nozzles;

Fig. 8 is the schematic diagram of jet nozzle;

In the figure, anaerobic fermentation tank 1, raw material feeding port 1.1, biogas slurry feeding port 1.2, biogas outlet 1.3, stirring shaft 1.4, stirrer 1.5, hydrolysis stirrer 1.51, acidification stirrer 1.52, gas production stirrer 1.53, Biogas residue outlet 1.6, biogas injection inlet 1.7, biogas slurry outlet 1.8, biogas slurry inoculum spray system 1.9, biogas injection system 1.10, anaerobic tank positive and negative pressure protection device 1.11, organic fertilizer aerobic fermentation tank 2, biogas residue inlet 2.1, aerobic fermentation bacterial agent inlet 2.2, exhaust gas outlet 2.3, aerobic stirring shaft 2.4, aerobic stirrer 2.5, first-level aerobic stirrer 2.51, second-level aerobic stirrer 2.52, third-level aerobic stirrer 2.53, Air inlet 2.6, organic fertilizer discharge pipe 2.7, aerobic fermentation bacterial agent spray system/biological bacteria spray system 2.8, air spray system 2.9, raw material feeder 3, biogas purification device 4, biogas purification device valve 4.1, biogas Liquid treatment device 5, biogas slurry outlet valve 5.1, biogas slurry treatment device valve 5.2, biogas residue discharge device 6, aerobic fermentation bacterial agent storage tank 7, fermentation bacterial agent control valve 7.1, biological deodorant storage tank 8, biological Deodorant control valve 8.1, fermentation material physicochemical property detection device 9, biogas temporary storage tank 10, temporary storage tank valve 10.1, booster fan valve 10.2, biogas booster fan 10.3, biogas booster fan outlet valve 10.4, biogas liquid dehydrator Ammonia nitrogen plant 11, ammonia nitrogen removal plant outlet valve 11.1, biogas slurry transfer pump 11.2, biogas slurry check valve 11.3, main inlet valve 12, air pipe 13, air valves 13.1, biogas booster pump 13.2, bottom valve 13.3, waste gas treatment Device 14, spray nozzle 15, steel plate/wire mesh 15.1, stirring paddle 16, paddle 16.1.

Detailed ways

The present invention will be further described in detail below with reference to specific embodiments, so as to be understood by those skilled in the art.

Example 1

As shown in Figures 1, 2, 3, 4, 6, 7 and 8, the dry anaerobic fermentation and organic fertilizer fermentation integrated system includes interconnected anaerobic fermentation tanks 1 and organic fertilizer aerobic fermentation tanks 2 , the inclined tank wall at the bottom of the anaerobic fermentation tank 1 is opposite to the inclined direction of the inclined tank wall at the top of the organic fertilizer aerobic fermentation tank 2; the upper part of the anaerobic fermentation tank 1 is provided with a raw material feeding port 1.1, a biogas liquid feeding port 1.2 and a biogas outlet 1.3, the raw material feeding port 1.1 is connected with the raw material feeder 3,

The anaerobic fermentation tank 1 includes three stirring shafts 1.4 which are parallel and hinged at intervals; they are respectively a hydrolysis stirring shaft 1.41, an acidification stirring shaft 1.42 and a gas production stirring shaft 1.43; the two ends of the three stirring shafts 1.4 are respectively installed on the anaerobic fermentation tank. 1 on both side walls; and one end of the three stirring shafts 1.4 is connected to the external motor through the anaerobic fermentation tank 1;

The hydrolysis stirring shaft 1.41 is provided with three hydrolysis agitators 1.51 at intervals, and the acidification stirring shaft 1.42 is provided with three acidification stirrers 1.52 at intervals; the gas producing stirring shaft 1.43 is provided with three gas producing stirrers 1.53 at intervals; and the hydrolysis stirring The diameters of the mixer 1.51, the acidifying mixer 1.52 and the gas producing mixer 1.53 are the same or gradually decrease with the slope of the anaerobic tank; the three mixers 1.5 are composed of rice-shaped mixing paddles 16; 16.1 is corrugated, when the stirring paddle 16 is stirred, the length distribution of the liquid surface on the blade 16.1 of the stirring paddle 16 is corrugated;

A biogas residue outlet 1.6, a biogas injection inlet 1.7 and a biogas liquid outlet 1.8 are sequentially opened at the bottom of the anaerobic fermentation tank 1 from the upper end to the lower end of the inclined tank wall. The pipeline between 1.3 and the biogas purification device 4 is provided with a biogas purification device valve 4.1, and the pipeline between the biogas outlet 1.3 and the biogas injection inlet 1.7 is sequentially provided with a temporary storage tank valve 10.1, a biogas temporary storage tank 10, and a booster fan Valve 10.2, biogas booster fan 10.3 and biogas booster fan outlet valve 10.4;

The biogas slurry outlet 1.8 is respectively connected with the biogas slurry treatment device 5 and the biogas slurry feed port 1.2 through pipelines;

The pipeline between the biogas liquid outlet 1.8 and the biogas liquid treatment device 5 is provided with a biogas liquid outlet valve 5.1 and a biogas liquid treatment device valve 5.2;

A biogas slurry inoculum spray system 1.9 and a biogas injection system 1.10 are respectively set on the tank wall of the anaerobic fermentation tank 1 above and below the agitator 1.5; 1.2 is communicated with the biogas injection inlet 1.7; the pipeline between the biogas liquid outlet 1.8 and the biogas liquid inlet 1.2 is sequentially provided with a biogas liquid outlet valve 5.1, a biogas liquid ammonia nitrogen removal device 11, a ammonia nitrogen removal device outlet valve 11.1, biogas liquid (circulating liquid) transfer pump 11.2 and biogas slurry (inoculation liquid) check valve 11.3;

The top wall of the anaerobic fermentation tank 1 is provided with three detection devices 9 for physicochemical properties of fermented materials and a positive and negative pressure protection device 1.11 for the anaerobic tank; three stirrers 1.5 are in one-to-one correspondence with the detection device 9 for physicochemical properties of fermentation materials above; The physical and chemical characteristics detection device 9 detects data, and the data is input into the computer. The computer controls the stirring intensity of the mixer through the controller. The data from the detection device can also be input into the computer. The computer controls the opening of the upper and lower spray systems through the controller. and opening strength;

The organic fertilizer aerobic fermentation tank 2 is provided with a biogas residue inlet 2.1, aerobic fermentation bacterial agent inlet 2.2 and waste gas outlet 2.3 on the inclined tank wall at the top of the organic fertilizer aerobic fermentation tank 2; the waste gas outlet 2.3 is communicated with the external waste gas treatment device 14; The discharge device 6 is communicated with the biogas residue inlet 2.1; the aerobic fermentation bacterial agent inlet 2.2 is connected with the aerobic fermentation bacterial agent storage tank 7 and the biological deodorant storage tank 8 through pipelines; the organic fertilizer aerobic fermentation tank 2 includes hinged in the The aerobic stirring shaft 2.4 at both ends of the organic fertilizer aerobic fermentation tank 2; one end of the aerobic stirring shaft 2.4 is connected to the external motor; three aerobic stirring shafts 2.5 are arranged at intervals on the aerobic stirring shaft 2.4; Oxygen stirrer 2.51, secondary aerobic stirrer 2.52 and tertiary aerobic stirrer 2.53; 3 aerobic stirrers 2.5 are composed of rice-shaped stirring paddles 16; and the paddles 16.1 of the stirring paddles 16 are corrugated;

The bottom of the organic fertilizer aerobic fermentation tank 2 is provided with an air inlet 2.6; the upper part of the tank wall at one end of the organic fertilizer aerobic fermentation tank 2 is provided with an organic fertilizer discharge pipe 2.7; the organic fertilizer aerobic fermentation tank 2 up and down the aerobic stirring shaft 2.4 The tank walls are respectively provided with aerobic fermentation bacteria spray system/biological bacteria spray system 2.8 and air spray system 2.9; aerobic fermentation bacteria spray system/biological bacteria spray system 2.8 and air spray system 2.9 are respectively the same as The oxygen fermentation bacterial agent inlet 2.2 is communicated with the air inlet 2.6; the aerobic fermentation bacterial agent inlet 2.2 is provided with a fermentation bacterial agent control valve 7.1 on the pipeline of the aerobic fermentation bacterial agent storage tank 7 and the biological deodorant storage tank 8. The odorant control valve 8.1 and the main inlet valve 12; the air inlet 2.6 is connected with an air pipe 13, and the air pipe 13 is sequentially provided with air valves 13.1, a biogas booster pump 13.2 and a bottom valve 13.3.

The bottom wall of the organic fertilizer aerobic fermentation tank 2 is provided with three physicochemical property detection devices 9 for fermentation materials; the aerobic agitator 2.5 and the physicochemical property detection device 9 for fermentation materials below the , The data is input into the computer, the computer controls the stirring intensity of the mixer through the controller, and the data of the detection device can also be input into the computer.

The above-mentioned biogas slurry inoculum spraying system 1.9, biogas spraying system 1.10, aerobic fermentation bacterial agent spraying system/biological bacteria spraying system 2.8 and air spraying system 2.9 all include uniformly distributed or non-uniformly distributed spray nozzles 15. The spray nozzle 15 is a convex short pipe; and one end of the short pipe is welded with a steel plate drilled with spray holes or a wire mesh 15.1; the other end of the short pipe is welded to the outer wall of the fermentation tank.

The working process of the above-mentioned dry anaerobic fermentation and organic fertilizer fermentation integrated system:

1) After a series of pretreatments such as homogenization and concentration adjustment, the organic waste is inoculated with the fermentative bacterial agent through the raw material feeder 3, and then enters the dry anaerobic fermentation tank 1 through the raw material feeding port 1.1, and the raw material is in 1. In the anaerobic fermentation tank, anaerobic fermentation is carried out under the stirring of the three-stage stirrer of the hydrolysis stirrer 1.51, the acidifying stirrer 1.52 and the gas producing stirrer 1.53. When the agitator 1.51 stirs clockwise, the acidizing agitator 1.52 rotates counterclockwise. Similarly, the rotation directions of the acidizing agitator 1.52 and the gas producing agitator 1.53 are also opposite, and the material can be continuously driven by the three-stage agitator. to the other end of the reactor to ensure the continuity of anaerobic fermentation;

2) The biogas produced by anaerobic fermentation is concentrated to the biogas outlet 1.3 and discharged into the system. Most of the biogas from the fermentation tank enters the biogas purification device 4 through the biogas purification device valve 4.1, and is used for biogas boiler combustion, internal combustion engine power generation or direct Internet access. In addition, a small amount of biogas enters the biogas temporary storage tank 10 through the temporary storage tank valve 10.1, and then enters the biogas booster fan 10.3 through the booster fan valve 10.2 for boosting, and the pressurized biogas enters the biogas injection through the biogas booster fan outlet valve 10.4. System 1.10, the high-pressure biogas is injected into the anaerobic fermentation tank 1, forming a stirring effect on the materials in the fermentation tank, eliminating the formation of the three-stage agitator caused by the hydrolysis agitator 1.51, the acidification agitator 1.52 and the gas production agitator 1.53 during the stirring process. Stir the dead corners to achieve the purpose of mixing the materials evenly;

3) The biogas slurry produced by anaerobic fermentation, after being collected at the biogas slurry outlet 1.8, passes through the biogas slurry outlet valve 5.1, and most of it enters the biogas slurry treatment device 5 through the biogas slurry treatment device valve 5.2, and then discharges up to the standard or uses liquid organic fertilizer . In addition, a small amount of biogas slurry enters the biogas slurry ammonia nitrogen removal device 11, and the biogas slurry after the ammonia nitrogen is removed passes through the biogas slurry transfer pump 11.2 and the biogas slurry check valve 11.3 through the exit valve 11.1 of the ammonia nitrogen nitrogen removal device in turn, and then enters the biogas slurry inoculation liquid spray. Spray system 1.9 to achieve uniform inoculation of anaerobic tanks. After normal operation, since the biogas slurry contains a large number of anaerobic fermentation bacteria, this part of the inoculation can reduce the amount of inoculated microorganisms in the raw material feeding process, thereby reducing the cost (during the working process, the physicochemical properties detection device 9 of the fermentation material, by sampling or On-line detection of the composition of the fermentation gas, the composition of the fermentation material and other data to adjust the feed amount, the stirring intensity of the agitator, the return flow of the biogas slurry, the injection amount of the biogas, the temperature of the fermentation tank and other process parameters; process engineering of oxygen fermentation),

The above-mentioned anaerobic fermentation tank process parameters are: the pressure in the anaerobic tank is 0～5000Pa (gauge pressure), the residence time is 10～30d, the volume gas production rate is 1～4m ³ /m ³ ·d, and the medium temperature fermentation temperature is 33 ~42℃, high temperature fermentation temperature is 50 ~ 55℃. The anaerobic tank is in the form of a sealed horizontal steel structure, and the bottom slope is 0.1% to 1%;

The working materials of the organic fertilizer system are basically the same as the above-mentioned anaerobic fermentation system, the only difference is:

(1) The upper end of the organic fertilizer system is inoculated with aerobic fermentation microorganisms from the aerobic fermentation bacterial agent storage tank 7 or microorganisms or chemical deodorants from the biological deodorizing bacterial agent storage tank 8. Generally, aerobic fermentation bacteria are inoculated in the early stage of aerobic fermentation, and deodorant bacteria are inoculated in the organic fertilizer aging stage;

(2) The spray system at the lower end of the organic fertilizer system sprays air to supply oxygen instead of biogas. The working principle of other links is the same as that of the dry anaerobic fermentation system. General: The residence time of the material in the aerobic fermentation tank of organic fertilizer is 10-30d, and the residence time can be adjusted according to the characteristics of the material. Generally, the aerobic fermentation stage is 8-15d, and the post-fermentation (aging) stage is 10-15d. The oxygen supply frequency is It is advisable to meet the technological requirements of aerobic fermentation. The anaerobic tank is in the form of a sealed horizontal steel structure, and the slope of the upper end is 0.1% to 1%. In the same project, the slope can be the same as that of the anaerobic tank, so as to ensure that the two tanks can be spliced together and reduce the equipment footprint.

Example 2

The dry anaerobic fermentation and organic fertilizer fermentation integrated system shown in Figures 1, 2, 3, 5, 6, 7 and 8 are basically the same in structure as in Example 1, except that:

The stirrer 1.5 and the aerobic stirrer 2.5 consist of a cross-shaped stirring paddle 16 .

Other parts that are not described in detail are the prior art. Although the above embodiment has made a detailed description of the present invention, it is only a part of the embodiments of the present invention, rather than all the embodiments. People can also obtain other embodiments according to the present embodiment without creativity. These embodiments All belong to the protection scope of the present invention.

Claims (10)

1. an integrated system of dry anaerobic fermentation and organic fertilizer fermentation, characterized in that: the system comprises an interconnected anaerobic fermenter (1) and an organic fertilizer aerobic fermenter (2), the anaerobic fermentor (2) The inclined direction of the bottom inclined tank wall of the fermentation tank (1) is opposite to the inclined direction of the top inclined tank wall of the organic fertilizer aerobic fermentation tank (2); the upper part of the anaerobic fermentation tank (1) is provided with a raw material feeding port (1.1), a biogas slurry A feed port (1.2) and a biogas outlet (1.3), the raw material feed port (1.1) is connected with a raw material feeder (3), and the anaerobic fermentation tank (1) includes a plurality of stirring shafts hinged in parallel (1.4); both ends of the stirring shaft (1.4) are respectively installed on both side walls of the anaerobic fermenter (1); and one end of the stirring shaft (1.4) passes through the anaerobic fermenter (1) and is connected to an external motor; A plurality of agitators (1.5) are arranged at intervals on the stirring shaft (1.4); a biogas residue outlet (1.6) and a biogas injection inlet (1.7) are sequentially opened from the upper end to the lower end of the inclined tank wall at the bottom of the anaerobic fermentation tank (1). and the biogas liquid outlet (1.8); the biogas outlet (1.3) is respectively connected with the biogas purification device (4) and the biogas injection inlet (1.7) through the pipeline; the biogas liquid outlet (1.8) is respectively connected with the biogas liquid treatment device through the pipeline (5) communicate with the biogas slurry feed port (1.2); the anaerobic fermentation tank (1) above and below the agitator (1.5) is respectively provided with a biogas slurry inoculum spray system (1.9) and a biogas spray system (1.10); the biogas slurry inoculum spraying system (1.9) and the biogas injection system (1.10) are respectively communicated with the biogas slurry feed inlet (1.2) and the biogas injection inlet (1.7); The organic fertilizer aerobic fermentation tank (2) is provided with a biogas residue inlet (2.1), an aerobic fermentation bacterial agent inlet (2.2) and an exhaust gas outlet (2.3) on the inclined tank wall at the top; the biogas residue outlet (1.6) passes through The biogas residue discharging device (6) is communicated with the biogas residue inlet (2.1); the aerobic fermentation bacterial agent inlet (2.2) is connected with an aerobic fermentation bacterial agent storage tank (7) and a biological deodorant storage tank ( 8); the organic fertilizer aerobic fermentor (2) includes an aerobic stirring shaft (2.4) hinged at both ends of the organic fertilizer aerobic fermentation tank (2); one end of the aerobic stirring shaft (2.4) passes through the The external motor is connected; the aerobic stirring shaft (2.4) is provided with a plurality of aerobic stirrers (2.5) at intervals; the bottom of the organic fertilizer aerobic fermentation tank (2) is provided with an air inlet (2.6); the The organic fertilizer aerobic fermentation tank (2) is provided with an organic fertilizer discharge pipe (2.7) on the upper part of the tank wall at one end; There are aerobic fermentation bacteria agent spraying system/biological bacteria spraying system (2.8) and air injection system (2.9); the aerobic fermentation bacteria agent spraying system/biological bacteria spraying system (2.8) and air injection system ( 2.9) are respectively communicated with the aerobic fermentation bacterial agent inlet (2.2) and the air inlet (2.6). 2. The integrated system of dry anaerobic fermentation and organic fertilizer fermentation according to claim 1, characterized in that: the top wall of the anaerobic fermentation tank (1) is provided with a plurality of detection devices (9) for physicochemical properties of fermentation materials and an anaerobic tank positive and negative pressure protection device (1.11); the agitator (1.5) corresponds to the upper fermentation material physicochemical property detection device (9) in one-to-one correspondence. 3. The integrated system of dry anaerobic fermentation and organic fertilizer fermentation according to claim 1, characterized in that: the bottom wall of the organic fertilizer aerobic fermentation tank (2) is provided with a plurality of fermentation material physicochemical property detection devices ( 9); the aerobic stirrer (2.5) corresponds to the lower fermentation material physicochemical property detection device (9) one by one. 4. The integrated system of dry anaerobic fermentation and organic fertilizer fermentation according to claim 1, characterized in that: the pipeline between the biogas outlet (1.3) and the biogas purification device (4) is provided with a biogas purification device valve (4.1), the pipeline between the biogas outlet (1.3) and the biogas injection inlet (1.7) is sequentially provided with a temporary storage tank valve (10.1), a biogas temporary storage tank (10), a booster fan valve (10.2), Biogas booster fan (10.3) and biogas booster fan outlet valve (10.4). 5. The integrated system of dry anaerobic fermentation and organic fertilizer fermentation according to claim 1, characterized in that: the pipeline between the biogas slurry outlet (1.8) and the biogas slurry treatment device (5) is provided with biogas slurry An outlet valve (5.1) and a biogas slurry treatment device valve (5.2); a biogas slurry outlet valve (5.1), a biogas slurry removal valve (5.1), a biogas slurry outlet valve (5.1) and a biogas slurry removal valve (5.1) are arranged on the pipeline between the biogas slurry outlet (1.8) and the biogas slurry feed port (1.2). Ammonia nitrogen device (11), outlet valve (11.1) of ammonia nitrogen removal device, biogas slurry transfer pump (11.2) and biogas slurry check valve (11.3). 6. dry anaerobic fermentation and organic fertilizer fermentation integrated system according to claim 1, is characterized in that: described aerobic fermentation bacterial agent inlet (2.2) and aerobic fermentation bacterial agent storage tank (7) and biological removal A fermentation bacterial agent control valve (7.1), a biological deodorant control valve (8.1) and an inlet main valve (12) are arranged on the pipeline of the odorant storage tank (8), and the waste gas outlet (2.3) is connected to an external waste gas treatment valve. The device (14) communicates. 7. The integrated system of dry anaerobic fermentation and organic fertilizer fermentation according to claim 1, characterized in that: an air pipe (13) is connected to the air inlet (2.6), and the air pipe (13) is connected in sequence. There are air valves (13.1), a biogas booster pump (13.2) and a bottom valve (13.3). 8. The integrated system of dry anaerobic fermentation and organic fertilizer fermentation according to claim 1, characterized in that: the number of the stirring shafts (1.4) is 3, which are respectively a hydrolysis stirring shaft (1.41), an acidification stirring shaft ( 1.42) and a gas producing stirring shaft (1.43); the three stirring shafts (1.41) are correspondingly provided with a hydrolysis stirrer (1.51), an acidifying stirrer (1.52) and a gas producing stirrer (1.53). 9. The integrated system of dry anaerobic fermentation and organic fertilizer fermentation according to claim 8, characterized in that: the stirrer (1.5) and the aerobic stirrer (2.5) are made of rice-shaped or cross-shaped stirring paddles (16) composition; the blades (16.1) of the stirring paddle are corrugated; the diameters of the blades (16.1) of the hydrolysis agitator (1.51), the acidification agitator (1.52) and the gas generating agitator (1.53) The same or gradually decreased with the slope of the anaerobic tank. 10. The integrated system of dry anaerobic fermentation and organic fertilizer fermentation according to claim 1, characterized in that: the biogas slurry inoculum spray system (1.9), the biogas injection system (1.10), the aerobic fermentation bacterial agent The spray system/biological bacteria spray system (2.8) and the air spray system (2.9) both comprise uniformly distributed or non-uniformly distributed spray nozzles (15), the spray nozzles (15) being convex short pipes; and One end of the short pipe is welded with a steel plate drilled with spray holes or welded with a wire mesh (15.1); the other end is welded to the outer wall of the fermenter.

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