Three-stage fermentation device for liquid amino acid organic fertilizer

Abstract

The invention discloses a liquid amino acid organic fertilizer three-stage fermentation device, which relates to the technical field of organic fertilizer preparation and comprises a first-stage fermentation unit, a second-stage mixed fermentation tank, a third-stage fermentation tank and a control unit. The primary fermentation unit comprises a plurality of parallel primary fermentation tanks, each tank is provided with a first electric stirring paddle, a first feed port, a first gas inlet, a built-in cooling pipe, a heating pipe, a first gas distributor and a first temperature, gas pressure and pH value sensor, and fermentation conditions can be independently regulated and controlled; the second-stage mixed fermentation tank receives the first-stage fermentation material, is provided with a second electric stirring paddle, a feeding hole, an exhaust hole and a second gas inlet, is internally provided with a second gas distributor and a corresponding sensor, and is externally provided with a cooling jacket; the third-stage fermentation tank is provided with a third electric stirring paddle; the control unit regulates and controls operation of all the components. The device can accurately control fermentation conditions for different raw materials, solves the problem of low mixed fermentation efficiency, improves the nutrient release rate, reduces the equipment cost, and forms an efficient and low-cost production system.

Description

Technical Field

[0001] The invention relates to the technical field of organic fertilizer preparation, in particular to a three-stage fermentation device for liquid amino acid organic fertilizer. Background Art

[0002] Liquid amino acid organic fertilizer, a new, highly effective fertilizer, offers significant advantages in agricultural production due to its rich content of amino acids, humus, and various nutrients essential for crop growth. When applied to crops, it effectively promotes root development and seedling growth, enhances leaf photosynthesis efficiency, and strengthens crop resistance, ultimately increasing yields and incomes. Therefore, it holds broad application prospects in the agricultural sector.

[0003] Currently, the production of liquid amino acid organic fertilizer mostly uses high-protein agricultural waste materials such as soybean meal, soybean cake, rapeseed cake, peanut cake, expired dairy products, and fish and shrimp processing waste as raw materials. To ensure nutritional balance, existing production processes generally use a mixed fermentation method for multiple raw materials. However, the fermentation characteristics of different raw materials vary significantly, and the key fermentation conditions required, such as temperature, pressure, and pH, vary. When multiple raw materials are mixed and fermented, it is difficult to simultaneously meet the optimal fermentation conditions for each raw material, which can easily lead to reduced fermentation efficiency and inability to fully release the nutrients in the raw materials.

[0004] In terms of fermentation equipment, fully enclosed fermentation tanks are generally used for liquid organic fertilizer fermentation. In order to ensure the stability and safety of the fermentation process, the relevant equipment is mostly high-cost pressure-resistant equipment. However, this type of equipment has obvious limitations: on the one hand, the equipment investment cost is high, which greatly increases the initial investment in production; on the other hand, the equipment occupancy time during the fermentation cycle is long, and the processing volume per unit time is limited, resulting in a low return on investment. Although the idea of ​​multi-stage fermentation has been proposed in the prior art, by using fermentation tanks of corresponding specifications and sealing levels at different fermentation periods, the processing efficiency of high-cost pressure-resistant fermentation tanks can be improved, and the number of equipment and investment costs can be reduced, but for the specific product of liquid amino acid organic fertilizer, the existing multi-stage fermentation equipment has not yet been specifically designed in combination with the differentiated fermentation conditions of multiple raw materials, and still cannot solve the problem of low efficiency caused by mismatched conditions when multiple raw materials are mixed and fermented, nor has it formed a set of efficient and low-cost process systems suitable for step-by-step fermentation of multiple raw materials. Summary of the Invention

[0005] The purpose of the present invention is to provide a liquid amino acid organic fertilizer three-stage fermentation device to solve the problems existing in the above-mentioned prior art and improve the fermentation efficiency of the liquid amino acid organic fertilizer.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a three-stage fermentation device for liquid amino acid organic fertilizer, comprising:

[0008] A primary fermentation unit, the primary fermentation unit includes several primary fermentation tanks arranged in parallel; each of the primary fermentation tanks is provided with a first electric stirring paddle, a first feed port, a first air inlet and a first exhaust port, the first electric stirring paddle is used to stir the material in the corresponding primary fermentation tank, the first feed port and the first exhaust port are located at the top of the corresponding primary fermentation tank, the first air inlet is located at the bottom of the corresponding primary fermentation tank, each of the primary fermentation tanks is provided with a cooling pipe, a heating pipe, a first gas distributor, a first temperature sensor, a first air pressure sensor and a first pH sensor, the cooling pipe is vertically arranged and fixedly connected to the corresponding primary fermentation tank, the bottom end of the cooling pipe is a refrigerant inlet and the top end is a refrigerant outlet; the heating pipe is sealed and a heating wire is provided in the heating pipe; the air inlet of the first gas distributor is connected to the first air inlet;

[0009] A secondary mixed fermentation tank, wherein the discharge port of each of the primary fermentation tanks is connected to the feed port at the top of the secondary fermentation tank through a pipeline; the top of the secondary fermentation tank is also provided with a feed port and a second exhaust port, the secondary fermentation tank is provided with a second electric stirring paddle, the second electric stirring paddle is used to stir the material in the secondary fermentation tank, the bottom end of the secondary fermentation tank is provided with a second air inlet, the secondary fermentation tank is provided with a second gas distributor, a second temperature sensor, a second air pressure sensor and a second pH sensor, the air inlet of the second gas distributor is connected to the second air inlet, and the secondary fermentation tank and each of the primary fermentation tanks are equipped with a pH control system;

[0010] A third-stage fermentation tank, wherein the discharge port of the second-stage fermentation tank is connected to the third-stage fermentation tank, and the third-stage fermentation tank is provided with a third electric stirring paddle, and the third electric stirring paddle is used to stir the material in the third-stage fermentation tank;

[0011] A control unit, the first temperature sensor, the first air pressure sensor, the first pH sensor, the second temperature sensor, the second air pressure sensor, the second pH sensor and each of the pH control systems are respectively connected to the control unit by signal, and the control unit can control the opening and closing and power of each of the heating wires, the flow rate of the refrigerant in each of the cooling tubes, the flow rate of each of the first air inlets and the operation of each of the pH control systems.

[0012] Preferably, the first electric stirring paddle is a folding axial flow stirring paddle.

[0013] Preferably, the first gas distributor is a porous ring tube type gas distributor.

[0014] Preferably, the refrigerant is cooling water, and the heating tube is U-shaped.

[0015] Preferably, each of the first feed ports is provided with a transparent first feed cover; the first feed cover is detachably connected or hinged to the corresponding first feed port.

[0016] Preferably, each of the second feed ports is provided with a transparent second feed cover; the second feed cover is detachably connected or hinged to the corresponding second feed port.

[0017] Preferably, the second electric stirring paddle is provided with a first layer of stirring paddles, a second layer of stirring paddles and a third layer of stirring paddles spaced from top to bottom. The first layer of stirring paddles and the second layer of stirring paddles are axial flow stirring paddles, and the third layer of stirring paddles are disc straight blade turbine stirring paddles.

[0018] Preferably, the outer fixed jacket of the secondary mixed fermentation tank is provided with a cooling jacket, and the cooling jacket is used to pass cooling water to cool the secondary mixed fermentation tank.

[0019] Preferably, the second gas distributor is a disc-type distributor or a porous ring-tube gas distributor.

[0020] Preferably, when the three-stage fermentation tank is arranged outdoors, a rainproof shed needs to be set up above the three-stage fermentation tank.

[0021] Compared with the prior art, the present invention has achieved the following technical effects:

[0022] The liquid amino acid organic fertilizer three-stage fermentation device of the present invention achieves efficient fermentation effect through the collaborative design of three-stage fermentation: on the one hand, several parallel first-stage fermentation tanks in the first-stage fermentation unit can be aimed at the fermentation characteristics of different raw materials, by independently controlling the temperature (heating tube, cooling tube matching) in each tank, pH value (pH control system), stirring (first electric stirring paddle) and air intake (first gas distributor) and other conditions, to achieve differentiated pretreatment fermentation of multiple raw materials, avoiding the problem of condition conflict caused by raw material characteristics differences in traditional mixed fermentation, and laying a high-quality material foundation for subsequent fermentation; on the other hand, the secondary mixed fermentation tank can carry out fusion fermentation of the material fermented by the first-stage fermentation, and its adapted stirring structure (multi-layer stirring paddle), gas distribution (second gas distributor) and temperature control (cooling jacket, etc.) design can meet the fermentation demand of the mixed material and promote the full reaction of the material; then cooperate with the subsequent treatment of the three-stage fermentation tank to form a complete step-by-step fermentation system. At the same time, the device is independently regulated by the first-stage fermentation tank, the secondary tank is targeted to adapt to the mixed fermentation, and the hierarchical design of the three-stage pool is simply handled. On the basis of accurately controlling the fermentation conditions, the occupancy of high-cost pressure-resistant equipment is reduced, and the overall investment cost is reduced. In summary, the device effectively improves the fermentation efficiency of liquid amino acid organic fertilizer, can fully release the nutrients of the raw materials, and at the same time constructs an efficient and low-cost process system suitable for step-by-step fermentation of multiple raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a schematic structural diagram of the three-stage fermentation device for liquid amino acid organic fertilizer of the present invention;

[0025] Figure 2 This is a schematic structural diagram of a primary fermentation tank in the present invention;

[0026] Figure 3 It is a structural schematic diagram of the secondary fermentation tank in the present invention;

[0027] Figure 4 Schematic diagram of the structure of the heating tube in the present invention;

[0028] In the figure: 1. Primary fermentation unit; 11. Primary fermentation tank; 12. First electric stirring paddle; 13. First feed port; 14. First air inlet; 15. Cooling pipe; 151. Refrigerant inlet; 152. Refrigerant outlet; 16. Heating pipe; 161. Heating wire; 17. First gas distributor; 18. First temperature sensor; 19. First air pressure sensor; 110. First pH sensor; 111. First feed cap; 112. First air outlet;

[0029] 2. Secondary mixed fermentation tank; 21. Second electric stirring paddle; 211. First-layer stirring paddle; 212. Second-layer stirring paddle; 213. Third-layer stirring paddle; 22. Feeding port; 23. Second exhaust port; 24. Second air inlet; 25. Second gas distributor; 26. Second temperature sensor; 27. Second air pressure sensor; 28. Second pH sensor; 29. ​​Cooling jacket; 210. Second feed cover;

[0030] 31. Three-stage fermentation tank; 32. Third electric stirring paddle; 33. Rainproof shed;

[0031] 4. pH control system. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] The purpose of the present invention is to provide a liquid amino acid organic fertilizer three-stage fermentation device to solve the problems existing in the above-mentioned prior art and improve the fermentation efficiency of the liquid amino acid organic fertilizer.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] like Figures 1 to 4 As shown, this embodiment provides a three-stage fermentation device for liquid amino acid organic fertilizer, including a primary fermentation unit 1, a secondary fermentation tank, a tertiary fermentation tank 31 and a control unit.

[0036] The specific structure of the primary fermentation unit 1 is as follows:

[0037] The primary fermentation unit 1 includes three primary fermentation tanks 11 arranged in parallel, each of which corresponds to one type or category of raw materials with similar fermentation characteristics. A first feed port 13 is provided at the top of the primary fermentation tank 11. The first feed port 13 is equipped with a transparent first feed cover 111. The first feed cover 111 can be detachably connected to the first feed port 13 via a snap-fit ​​structure, or the first feed cover 111 can be threadedly connected to the first feed port 13, or the first feed cover 111 can be connected to the first feed port 13 in a hinged manner to facilitate observation of the feeding situation and feeding operation. A first air inlet 14 is provided at the bottom of the primary fermentation tank 11, and a vertical cooling pipe 15 and a U-shaped heating pipe 16 are provided inside. The bottom end of the cooling tube 15 is a refrigerant inlet 151, and the top end is a refrigerant outlet 152. The refrigerant is cooling water. By controlling the cooling water flow rate, the temperature inside the tank can be precisely controlled. The control of the cooling water flow rate can be achieved by allowing the control unit to control the power of the cooling water pump corresponding to the cooling tube 15. Specifically, each cooling tube 15 corresponds to a cooling water inlet pipe and a cooling water outlet pipe. The refrigerant inlet 151 of the cooling tube 15 is connected to the outlet of the cooling water source through the cooling water inlet pipe, and the refrigerant outlet 152 of the cooling tube 15 is connected to the return water port of the cooling water source through the cooling water outlet pipe. The cooling water pump corresponding to the cooling tube 15 is set on the cooling water inlet pipe. The heating tube 16 is sealed, and the internal heating wire 161 can adjust the power of the heating wire 161 through the control unit to achieve heating of the fermentation material.

[0038] It is worth noting that the cooling pipe 15 vertically arranged in the primary fermentation tank 11 can play a blocking role on the material in the primary fermentation tank 11, that is, the cooling pipe 15 can act as a partial baffle function, which is beneficial to enhance convection of the liquid in the tank and prevent the generation of vortexes during the stirring process, thereby preventing the agitator from failing to stir.

[0039] The primary fermentation tank 11 is also equipped with a first gas distributor 17, whose air inlet is connected to the first air inlet 14. The first gas distributor 17 is a multi-porous annular gas distributor. The first air inlet 14 is used to introduce air or oxygen into the primary fermentation tank 11. The air or oxygen entering through the first air inlet 14 passes through the first gas distributor 17 and is evenly diffused in the fermentation liquid within the primary fermentation tank 11, providing sufficient oxygen for aerobic fermentation. Excess gas is discharged through the first exhaust port 112 at the top of the primary fermentation tank 11. The primary fermentation tank 11 is equipped with a first electric stirring paddle 12. Due to the high viscosity of the liquid in the primary fermentation, the first electric stirring paddle 12 is preferably a hinged axial flow stirring paddle, which can form an axial circulation flow of the material within the primary fermentation tank 11 and enhance the material mixing effect. In addition, the primary fermentation tank 11 is equipped with a first temperature sensor 18, a first air pressure sensor 19, and a first pH sensor 110, which are respectively used to monitor the temperature, air pressure, and pH value within the tank in real time. Each primary fermentation tank 11 is equipped with an independent pH control system 4, which can add acidic or alkaline regulators according to the instructions of the control unit to maintain the pH environment required for fermentation.

[0040] It is worth noting that the pH control system 4 is a commercially available product well known to technicians, such as the SC-100ApH automatic control liquid addition system, so the specific structure and working principle of the pH control system 4 will not be elaborated in this embodiment.

[0041] In the optional scheme of this embodiment, it is more preferred that the diameter of the first gas distributor 17 is larger than the diameter of the first electric stirring paddle 12. At this time, the high-pressure gas sprayed upward can cooperate with the axial flow stirring paddle to drive the liquid to circulate better, which is beneficial to the mixing of the matrix and the transfer of oxygen.

[0042] The specific structure of the secondary mixed fermentation tank 2 is as follows:

[0043] The secondary mixed fermentation tank 2 has a feed port at the top. The discharge port of each primary fermentation tank 11 is connected to the feed port at the top of the secondary mixed fermentation tank 2 via a pipeline. A solenoid valve can be installed at the discharge port of each primary fermentation tank 11 to control material delivery. The secondary mixed fermentation tank 2 also has a feed port 22 at the top for replenishing fermentation materials such as microbial inoculants required for secondary fermentation. The feed port 22 is equipped with a transparent second feed cap 210, which is connected in a similar manner to the first feed cap 111. A second exhaust port 23 is also provided at the top of the secondary mixed fermentation tank 2 for exhausting gases generated by fermentation.

[0044] The secondary mixed fermentation tank 2 is equipped with a second electric agitator 21. A first layer of agitators 211, a second layer of agitators 212, and a third layer of agitators 213 are spaced apart from each other on the agitator shaft from top to bottom. The third layer of agitators 213 utilizes a disc-shaped, straight-bladed turbine agitator. This agitator interrupts the rising airflow, breaking up bubbles and generating a strong radial flow at the tank bottom, promoting shear and dispersion of the materials, allowing for thorough mixing of materials from different sources. The first and second layers of agitators 211, 212 utilize axial-flow agitators, which induce axial flow in the materials, enhancing the mixing effect and increasing the oxygen transfer coefficient of the equipment. A second air inlet 24 is located at the bottom of the secondary mixed fermentation tank 2. A second gas distributor 25 is located within the tank. The inlet of the second gas distributor 25 is connected to the second air inlet 24 and is used to introduce sterile air into the tank. The second gas distributor 25 utilizes a disc-type distributor or a multi-hole annular gas distributor. The pressure required for fermentation in the secondary fermentation tank is lower than that in the primary fermentation tank 11, and the pressure of the compressed air can also be lower than that in the primary fermentation tank 11. Accordingly, the pressure requirement for the tank body is also relatively low.

[0045] A cooling jacket 29 is mounted on the exterior of the secondary mixed fermentation tank 2. The inlet and outlet of the cooling jacket 29 are connected to the cooling water circulation system. Adjusting the cooling water flow rate controls the fermentation temperature within the tank. The tank is also equipped with a second temperature sensor 26, a second air pressure sensor 27, and a second pH sensor 28. A pH control system 4 is also provided to monitor and adjust fermentation conditions within the tank in real time.

[0046] The specific structure of the three-stage fermentation tank 31 is as follows:

[0047] The discharge port of the secondary mixed fermentation tank 2 is connected to the tertiary fermentation tank 31 via a pipeline equipped with a transfer pump. When the tertiary fermentation tank 31 is located outdoors, a rain shelter 33 is erected above it to prevent rainwater from entering the fermentation tank and affecting the fermentation process. A third electric stirring paddle 32 is installed within the tertiary fermentation tank 31 to regularly stir the fermented materials and promote the fermentation process.

[0048] The control unit utilizes a PLC control system or a host computer, and is signal-connected to the first temperature sensor 18, the first air pressure sensor 19, the first pH sensor 110, the second temperature sensor 26, the second air pressure sensor 27, the second pH sensor 28, and each pH control system 4. Based on the data fed back by these sensors, the control unit controls the on / off switching and power of the heating wire 161, adjusts the flow rate of the refrigerant in the cooling tube 15, the gas flow rate at the first and second air inlets 14, 24, and the operation of the pH control system 4, thereby achieving automated control of the entire fermentation process.

[0049] The specific working process of the liquid amino acid organic fertilizer three-stage fermentation device of this embodiment is as follows:

[0050] First, the raw materials are placed in the corresponding primary fermentation tanks 11 according to their fermentation characteristics. The fermentation conditions of each tank, such as temperature and pH value, are set by the control unit. During the fermentation process, the first electric stirring paddle 12 continuously stirs the fermentation, and the first gas distributor 17 introduces an appropriate amount of air to promote microbial metabolism.

[0051] When the primary fermentation is completed, the control unit opens the corresponding solenoid valve to transport the materials in each primary fermentation tank 11 to the secondary mixed fermentation tank 2, and replenishes the necessary auxiliary materials and bacterial strains through the feeding port 22; the second electric stirring paddle 21 is started, and the three layers of different types of stirring paddles work together to fully mix the materials; the control unit adjusts the cooling water flow of the cooling jacket 29, the gas flow of the second air inlet 24, and the pH control system 4 based on the feedback data from the second temperature sensor 26, the second pH sensor 28, etc., to maintain the conditions required for mixed fermentation;

[0052] After the secondary fermentation is completed, the delivery pump delivers the material to the tertiary fermentation tank 31 for subsequent fermentation; the third electric stirring paddle 32 stirs regularly to promote the completion of fermentation; the final liquid amino acid organic fertilizer can be discharged through the discharge port of the tertiary fermentation tank 31 for subsequent packaging and storage.

[0053] This embodiment uses the above-mentioned three-stage fermentation device and process to accurately control the fermentation characteristics of different raw materials, improve fermentation efficiency, fully release the nutrients in the raw materials, and at the same time reduce equipment investment costs, forming an efficient and low-cost liquid amino acid organic fertilizer production system.

[0054] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A liquid amino acid organic fertilizer three-stage fermentation device, characterized in that: include: A primary fermentation unit, the primary fermentation unit includes several primary fermentation tanks arranged in parallel; each of the primary fermentation tanks is provided with a first electric stirring paddle, a first feed port, a first air inlet and a first exhaust port, the first electric stirring paddle is used to stir the material in the corresponding primary fermentation tank, the first feed port and the first exhaust port are located at the top of the corresponding primary fermentation tank, the first air inlet is located at the bottom of the corresponding primary fermentation tank, each of the primary fermentation tanks is provided with a cooling pipe, a heating pipe, a first gas distributor, a first temperature sensor, a first air pressure sensor and a first pH sensor, the cooling pipe is vertically arranged and fixedly connected to the corresponding primary fermentation tank, the bottom end of the cooling pipe is a refrigerant inlet and the top end is a refrigerant outlet; the heating pipe is sealed and a heating wire is provided in the heating pipe; the air inlet of the first gas distributor is connected to the first air inlet; A secondary mixed fermentation tank, wherein the discharge port of each of the primary fermentation tanks is connected to the feed port at the top of the secondary fermentation tank through a pipeline; the top of the secondary fermentation tank is also provided with a feed port and a second exhaust port, the secondary fermentation tank is provided with a second electric stirring paddle, the second electric stirring paddle is used to stir the material in the secondary fermentation tank, the bottom end of the secondary fermentation tank is provided with a second air inlet, the secondary fermentation tank is provided with a second gas distributor, a second temperature sensor, a second air pressure sensor and a second pH sensor, the air inlet of the second gas distributor is connected to the second air inlet, and the secondary fermentation tank and each of the primary fermentation tanks are equipped with a pH control system; A third-stage fermentation tank, wherein the discharge port of the second-stage fermentation tank is connected to the third-stage fermentation tank, and the third-stage fermentation tank is provided with a third electric stirring paddle, and the third electric stirring paddle is used to stir the material in the third-stage fermentation tank; A control unit, the first temperature sensor, the first air pressure sensor, the first pH sensor, the second temperature sensor, the second air pressure sensor, the second pH sensor and each of the pH control systems are respectively connected to the control unit by signal, and the control unit can control the opening and closing and power of each of the heating wires, the flow rate of the refrigerant in each of the cooling tubes, the flow rate of each of the first air inlets and the operation of each of the pH control systems.

2. The liquid amino acid organic fertilizer three-stage fermentation device according to claim 1, wherein: The first electric stirring paddle is a folding axial flow stirring paddle.

3. The liquid amino acid organic fertilizer three-stage fermentation device according to claim 1, wherein: The first gas distributor is a porous ring tube type gas distributor.

4. The liquid amino acid organic fertilizer three-stage fermentation device according to claim 1, wherein: The refrigerant is cooling water, and the heating tube is U-shaped.

5. The liquid amino acid organic fertilizer three-stage fermentation device according to claim 1, wherein: Each of the first feed ports is provided with a transparent first feed cover; the first feed cover is detachably connected or hinged to the corresponding first feed port.

6. The liquid amino acid organic fertilizer three-stage fermentation device according to claim 1, wherein: Each of the second feed ports is provided with a transparent second feed cover; the second feed cover is detachably connected or hinged to the corresponding second feed port.

7. The liquid amino acid organic fertilizer three-stage fermentation device according to claim 1, characterized in that: The second electric stirring paddle is provided with a first layer of stirring paddles, a second layer of stirring paddles and a third layer of stirring paddles spaced from top to bottom. The first layer of stirring paddles and the second layer of stirring paddles are axial flow stirring paddles, and the third layer of stirring paddles are disc straight blade turbine stirring paddles.

8. The liquid amino acid organic fertilizer three-stage fermentation device according to claim 1, characterized in that: The outer fixed shell of the secondary mixed fermentation tank is provided with a cooling jacket, and the cooling jacket is used to pass cooling water to cool the secondary mixed fermentation tank.

9. The liquid amino acid organic fertilizer three-stage fermentation device according to claim 1, characterized in that: The second gas distributor is a disc-type distributor or a porous ring-tube-type gas distributor.

10. The liquid amino acid organic fertilizer three-stage fermentation device according to claim 1, characterized in that: When the three-stage fermentation tank is arranged outdoors, a rainproof shed needs to be set up above the three-stage fermentation tank.

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