Energy-recyclable direct-cooling cooling system for fermentation tank

Abstract

The utility model discloses an energy-recyclable direct cooling system for a fermentation tank, and relates to the technical field of beer fermentation. Comprising a compressor, a heat exchanger, a refrigerant storage tank and a fermentation tank which are sequentially and circularly connected through a pipeline, a plurality of in-line condensation pipes are vertically arranged in the heat exchanger, a normal-temperature water inlet and a hot water outlet after heat exchange are formed in the side wall of the heat exchanger, a U-shaped coil pipe is arranged on the outer wall of the fermentation tank, and a cavity shell is arranged on the outer side of the U-shaped coil pipe; a cavity is formed by the cavity shell and the outer wall of the fermentation tank, and the U-shaped coil pipe is located in the cavity. The system disclosed by the utility model can improve the refrigerant refrigeration efficiency, reduce the loss, effectively utilize waste heat, save a large amount of electric energy, greatly reduce the temperature of the fermentation tank, heat the subsequent sterilization needs to be raised, and the fermentation tank plays a role in heat balance, so that the emission of water vapor generated by cooling the condenser conventionally to the atmosphere is reduced, the pollution to the environment is reduced, and the energy-saving and environment-friendly effects are achieved. And long-term economic value and social value can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of beer fermentation, and particularly relates to an energy-recyclable direct cooling and temperature reduction system for a fermentation tank. Background Art

[0002] Energy conservation, emission reduction, low carbon, and reduction of the greenhouse gas effect have not only become a consensus but also an inevitable constraint in the development process of enterprises, and even the survival of the fittest. During the production process of beer enterprises, in order to create the best growth environment for microorganisms in the fermentation tank, it is necessary to stably control its temperature. Especially for the refrigeration and temperature reduction during the beer fermentation process. For this purpose, a refrigeration station needs to be configured, including refrigeration units, cooling towers, etc., with large investment, large floor area, and high operation and maintenance costs. At the same time, a refrigeration station needs to supply multiple fermentation tanks in the whole factory, with a large scattered area and long refrigerant supply pipelines. Although there is heat insulation, a large amount of cold energy is still lost. During the reciprocating use of the refrigerant medium, a large amount of volatilization also occurs, and continuous replenishment is required. In addition, at present, most fermentation tanks in beer factories adopt the cooling method of the jacket structure, with many dead ends in the refrigerant circulation channel, which is extremely easy to scale and cannot be cleaned. The more scale accumulates, the thicker it becomes, seriously affecting the heat exchange between the refrigerant and the materials in the fermentation tank. Content of the Utility Model

[0003] The main purpose of the utility model is to provide an energy-recyclable direct cooling and temperature reduction system for a fermentation tank to overcome the problems existing in the prior art.

[0004] To solve the above technical problems, the utility model adopts the following technical solutions:

[0005] An energy-recyclable direct cooling and temperature reduction system for a fermentation tank includes a compressor, a heat exchanger, a refrigerant storage tank, and a fermentation tank that are sequentially connected in a cycle through pipelines. A plurality of straight condensation pipes are vertically arranged inside the heat exchanger. A normal temperature water inlet and a hot water outlet after heat exchange are provided on the side wall of the heat exchanger. A U-shaped coil pipe is provided on the outer wall of the fermentation tank. A cavity shell is arranged outside the U-shaped coil pipe. A cavity is formed between the cavity shell and the outer wall of the fermentation tank. The U-shaped coil pipe is located in the cavity.

[0006] Further, the heat exchanger includes a high-temperature heat exchanger and a low-temperature heat exchanger. The high-temperature heat exchanger and the low-temperature heat exchanger are sequentially connected to the pipeline between the compressor and the refrigerant storage tank. An oil separator is provided on the pipeline between the high-temperature heat exchanger and the low-temperature heat exchanger.

[0007] Further, the high-temperature heat exchanger and the low-temperature heat exchanger have the same structure, and both include an upper head, a lower head, and an intermediate cylindrical body. The upper head and the intermediate cylindrical body are connected through an upper flange. The lower head and the intermediate cylindrical body are both connected through a lower flange;

[0008] On both side walls of the middle cylindrical body, a water inlet pipeline interface and a water outlet pipeline interface are respectively connected. At the top of the upper head, an outlet pipeline is connected. At the bottom of the lower head, an inlet pipeline is connected. The inlet pipeline of the high-temperature heat exchanger is connected to the high-pressure output end of the compressor, and the outlet pipeline is connected to the inlet end of the oil separator. The inlet pipeline of the low-temperature heat exchanger is connected to the outlet end of the oil separator, and the outlet pipeline is connected to the inlet end of the refrigerant storage tank.

[0009] Furthermore, upper fixing rods and lower fixing rods are respectively connected inside the upper flange and the lower flange. Semi-circular flow guiding plates are connected to both the upper fixing rods and the lower fixing rods. Multiple round holes are arranged on the semi-circular flow guiding plates. The straight condenser tubes pass through the round holes, and both ends of the straight condenser tubes are connected to the holes on the upper flange and the lower flange respectively.

[0010] Furthermore, multiple sections of the U-shaped coiled pipes are distributed along the height direction of the fermentation tank and are spot-welded to the outer wall of the fermentation tank in an up-and-down arrangement. One cavity shell is arranged outside each section of the U-shaped coiled pipe, and the cavity shell is fixedly spot-welded to the outer wall of the fermentation tank.

[0011] Furthermore, the pipeline between the refrigerant storage tank and the fermentation tank includes a refrigerant main pipe and multiple sections of refrigerant branch pipes. The inlet of the refrigerant main pipe is connected to the outlet end of the refrigerant storage tank, and the outlet of the refrigerant main pipe is connected to the inlets of the refrigerant branch pipes. One section of the refrigerant branch pipe corresponds to one section of the U-shaped coiled pipe. A ball valve, a dryer filter, and a sight glass are sequentially arranged on the refrigerant main pipe along the flowing direction of the refrigerant.

[0012] Furthermore, a sight glass, a solenoid valve, and an expansion valve are sequentially arranged on the refrigerant branch pipe along the flowing direction of the refrigerant.

[0013] Furthermore, multiple temperature switches and multiple temperature sensors are connected to the fermentation tank. One temperature switch corresponds to the solenoid valve on one refrigerant branch pipe and is used to control the opening and closing of the solenoid valve. One temperature sensor corresponds to the expansion valve on one refrigerant branch pipe and is used to control the opening size of the expansion valve to finely adjust the refrigerant flow rate.

[0014] Furthermore, an evaporation pressure regulator and a crankcase pressure regulator are arranged on the pipeline between the outlet end of the U-shaped coiled pipe and the inlet end of the compressor to control the pressure in the pipeline.

[0015] Furthermore, a high-low pressure switch is connected to the compressor.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The outer wall of the fermenter is provided with U-shaped coiled pipes to cool the materials in the tank. This not only ensures uniform cooling from top to bottom, but also forms a cavity between the cavity shell and the outer wall of the fermenter. The U-shaped coiled pipes are located in the cavity, achieving air cooling at the non-contact part between the U-shaped coiled pipes and the tank body, making the cooling of the materials in the tank more uniform and optimizing the microbial fermentation in the tank. The U-shaped coiled pipes set on the outer wall of the fermenter facilitate the processing and manufacturing process, greatly reducing the number of welds on the tank body, with less deformation of the tank body and easy polishing treatment inside the tank, making the inner wall of the tank flat and smooth. The U-shaped coiled pipes set on the outer wall of the fermenter are made of round pipes with smooth inner walls, ensuring the smooth flow of the refrigerant medium, reducing the phenomenon of fouling and improving the heat exchange efficiency.

[0018] By setting up a high-temperature heat exchanger and a low-temperature heat exchanger, during the refrigeration process, the high temperature generated after the refrigerant is compressed can be recycled and reused, effectively reducing energy consumption, reducing carbon emissions, reducing the discharge of hot steam into the atmosphere using a cooling tower, and reducing the greenhouse gas effect.

[0019] When using this system, during the off-season of beer production, there is no need to start a unified refrigeration station. Only the fermenters in use and their corresponding direct cooling and temperature reduction systems need to be turned on, avoiding a large amount of useless waste. It reduces the cost of building a unified refrigeration station, reduces the floor area, and reduces the energy loss and volatilization during the multi-pipeline and long-distance transportation of the refrigerant. Description of the Drawings

[0020] Figure 1 It is the system process flow chart of the present utility model.

[0021] Figure 2 It is the structural schematic diagram of the high-temperature heat exchanger of the present utility model.

[0022] Figure 3 It is the structural schematic diagram of the U-shaped coiled pipes and the cavity shell of the present utility model.

[0023] Among them, 1 - compressor, 2 - high-temperature heat exchanger, 3 - low-temperature heat exchanger, 4 - refrigerant storage tank, 5 - expansion valve, 6 - U-shaped coiled pipes, 7 - cavity shell, 8 - fermenter, 9 - high and low pressure switch, 10 - oil separator, 11 - ball valve, 12 - drying filter, 13 - sight glass, 14 - solenoid valve, 15 - temperature switch, 16 - temperature sensing element, 17 - evaporation pressure regulator, 18 - crankcase pressure regulator;

[0024] 21 - lower head, 22 - upper head, 23 - middle cylindrical body, 24 - bolt, 25 - flange, 26 - straight condenser tube, 27 - semi-circular deflector, 28 - fixing rod, 29 - inlet pipeline, 210 - outlet pipeline, 212 - inlet water pipeline interface, 213 - outlet water pipeline interface. Detailed Embodiment

[0025] The technical solution of the present utility model will be further described below with reference to the accompanying drawings and embodiments.

[0026] Combined with Figures 1 to 3 , this embodiment provides an energy-reusable direct cooling system for a fermentation tank, including a compressor 1, a heat exchanger, a refrigerant storage tank 4, and a fermentation tank 8 that are sequentially connected in a cycle through pipelines. A plurality of straight condensation pipes are vertically arranged inside the heat exchanger. A normal temperature water inlet and a hot water outlet after heat exchange are provided on the side wall of the heat exchanger. A U-shaped coil 6 is provided on the outer wall of the fermentation tank 8. A cavity shell 7 is arranged outside the U-shaped coil 6. A cavity is formed between the cavity shell 7 and the outer wall of the fermentation tank. The U-shaped coil 6 is located in the cavity.

[0027] Preferably, the U-shaped coil 6 is distributed in multiple sections along the height direction of the fermentation tank 8 and is spot-welded to the outer wall of the fermentation tank 8 in an up-and-down arrangement. A cavity shell 7 is arranged outside each section of the U-shaped coil 6, and the cavity shell 7 is fixedly spot-welded to the outer wall of the fermentation tank 8.

[0028] This embodiment adopts the cooling structure of the U-shaped coil 6, which is processed from a round pipe and has a smooth inner wall, ensuring the smooth flow of the refrigerant medium, reducing the phenomenon of scaling, and improving the heat exchange efficiency. At the same time, the U-shaped coil 6 is spot-welded to the outer wall of the fermentation tank, which facilitates the processing and manufacturing process, greatly reduces the number of welds on the tank body, and the inner wall of the fermentation tank 8 has little deformation and is easy to polish later, with a smooth inner wall. In addition, the U-shaped coil 6 is placed in the cavity, and the cavity is equivalent to a cold exchange cavity. It not only realizes direct cold transfer at the contact part with the fermentation tank 8, but also the cavity plays an air-cooling effect, realizing air cooling at the non-contact part between the U-shaped coil 6 and the tank body, making the cooling of the materials in the tank more uniform and optimizing the microbial fermentation in the tank. Finally, it can avoid the problems of temperature difference between the upper and lower refrigerants and uneven cooling of the materials in the fermentation tank 8 caused by the circumferential spiral winding cooling structure of the traditional fermentation tank 8.

[0029] In this embodiment, the heat exchanger includes a high-temperature heat exchanger 2 and a low-temperature heat exchanger 3. The high-temperature heat exchanger 2 and the low-temperature heat exchanger 3 are sequentially connected to the pipeline between the compressor 1 and the refrigerant storage tank 4. An oil separator 10 is provided on the pipeline between the high-temperature heat exchanger 2 and the low-temperature heat exchanger 3.

[0030] Adopting this scheme, placing the oil separator 10 after the high-temperature heat exchanger 2 instead of between the compressor 1 and the high-temperature heat exchanger 2 can avoid the heat loss of the high-temperature and high-pressure refrigerant gas compressed by the compressor 1.

[0031] Specifically, normal temperature water enters the inner cavity of the heat exchanger through the normal temperature water inlet of the high-temperature heat exchanger 2. By exchanging heat with the high-pressure and high-temperature refrigerant gas in the in-line condenser tube, the temperature of the refrigerant is rapidly reduced, making it tend to be transformed into a high-pressure and low-temperature refrigerant. At the same time, through heat exchange, the normal temperature water in the inner cavity of the high-temperature heat exchanger is heated to hot water at about 60 °C within a short time and output through the hot water outlet. The refrigerant output from the high-temperature heat exchanger enters the low-temperature heat exchanger through the oil-water separator to continue exchanging heat (the process is the same as that of the high-temperature heat exchanger 2), and further obtains warm water at 35 °C.

[0032] In this embodiment, the high-temperature heat exchanger 2 and the low-temperature heat exchanger 3 have the same structure, both including an upper head 22, a lower head 21 and an intermediate cylindrical body 23. The upper head 22 is connected to the intermediate cylindrical body 23 through an upper flange, and the lower head 21 is connected to the intermediate cylindrical body 23 through a lower flange;

[0033] On both side walls of the intermediate cylindrical body 23, a water inlet pipe interface 212 and a water outlet pipe interface 213 are respectively connected. At the top of the upper head 22, an outlet pipe 210 is connected. At the bottom of the lower head 21, an inlet pipe 29 is connected. The inlet pipe of the high-temperature heat exchanger 2 is connected to the high-pressure output end of the compressor 1, and the outlet pipe is connected to the inlet end of the oil separator 10. The inlet pipe of the low-temperature heat exchanger 3 is connected to the outlet end of the oil separator 10, and the outlet pipe is connected to the inlet end of the refrigerant storage tank 4.

[0034] Preferably, an upper fixing rod and a lower fixing rod are respectively connected inside the upper flange and the lower flange. Semi-circular flow guide plates 27 are connected to both the upper fixing rod and the lower fixing rod. A plurality of round holes are provided on the semi-circular flow guide plates 27. The in-line condenser tube 26 passes through the round holes, and both ends of the in-line condenser tube 26 are connected to the holes on the upper flange and the lower flange.

[0035] Specifically, the upper flange and the lower flange are collectively referred to as the flange 25, and the upper fixing rod and the lower fixing rod are collectively referred to as the fixing rod 28.

[0036] The adoption of the semi-circular flow guide plates 27 not only plays a role in fixing the in-line condenser tube, but also makes the flow of the heated water generate turbulence, increasing the heat exchange effect.

[0037] In this embodiment, the pipeline between the refrigerant storage tank 4 and the fermentation tank 8 includes a main refrigerant pipeline and multiple sections of refrigerant branch pipelines. The inlet of the main refrigerant pipeline is connected to the outlet end of the refrigerant storage tank 4, and the outlet of the main refrigerant pipeline is connected to the inlet of the refrigerant branch pipelines. One section of the refrigerant branch pipeline is correspondingly connected to one section of the U-shaped coil 6. A ball valve 11, a dryer filter 12, and a sight glass 13 are sequentially arranged on the main refrigerant pipeline along the flowing direction of the refrigerant.

[0038] Preferably, a sight glass 13, a solenoid valve 14, and an expansion valve 5 are sequentially arranged on the refrigerant branch pipeline along the flowing direction of the refrigerant. A plurality of temperature switches 15 and a plurality of temperature sensors 16 are connected to the fermentation tank 8. One temperature switch 15 corresponds to the solenoid valve 14 on one refrigerant branch pipeline for controlling the opening and closing of the solenoid valve 14, and one temperature sensor 16 corresponds to the expansion valve 5 on one refrigerant branch pipeline for controlling the opening size of the expansion valve 5 to finely adjust the refrigerant flow rate.

[0039] Specifically, the numbers of the solenoid valve 14, the expansion valve 5, the temperature switch 15, and the temperature sensor 16 are all three. The three temperature switches 15 on the fermentation tank 8 respectively control the solenoid valves 14 on the corresponding three refrigerant pipelines. After reaching the set temperature, the solenoid valves 14 are closed to stop the refrigerant supply. When the temperature in the tank rises, the solenoid valves 14 are opened to supply the refrigerant. The three temperature sensors 16 on the fermentation tank 8 respectively control the expansion valves 5 on the corresponding three refrigerant pipelines. According to the high and low temperatures of the materials in the tank, the opening sizes of the expansion valves 5 are accurately controlled to finely adjust the refrigerant flow rate.

[0040] In this embodiment, an evaporation pressure regulator 17 and a crankcase pressure regulator 18 are arranged on the pipeline between the outlet end of the U-shaped coil 6 and the inlet end of the compressor 1 for controlling the pressure in the pipeline; a high and low pressure switch 9 is connected to the compressor 1.

[0041] Specifically, by setting the evaporation pressure regulator 17 and the crankcase pressure regulator 18, the pressure in the refrigerant pipeline can be controlled in real time to avoid excessive pressure and damage to the refrigerant pipeline and its components.

[0042] During operation, the refrigerant is pressurized by the compressor 1 to become a high-pressure and high-temperature refrigerant gas, which is transported through the pipeline to the high-temperature heat exchanger 2. The high and low pressure switch 9 controls the start and stop of the compressor according to the pressures at the refrigerant input and output ends of the compressor 1.

[0043] The high-temperature heat exchanger 2 converts the input high-pressure and high-temperature refrigerant gas into a high-pressure and medium-temperature refrigerant gas output through the heat exchange inside it and enters the oil separator 10 for oil removal; at the same time, the high-temperature heat exchanger 2 transfers the heat of the high-temperature refrigerant to the normal temperature water, making it reach 60°C and then output. The brewery can appropriately heat it for cleaning and disinfecting containers and pipelines.

[0044] The high-pressure medium-temperature refrigerant that has been deoiled by the oil separator 10 enters the low-temperature heat exchanger 3, repeating the process of the high-temperature heat exchanger 2 to further reduce the temperature of the refrigerant, and is output to the refrigerant storage tank 4; at the same time, through the internal heat exchange of the low-temperature heat exchanger 3, warm water at 35°C is obtained for output; the brewery can use this warm water for heating the freezing part during the CO2 liquid-gas conversion.

[0045] The low-temperature high-pressure liquid refrigerant is output from the refrigerant storage tank 4, filtered and dewatered by the dryer filter 12, passed through the expansion valve 5 to convert the high-pressure liquid refrigerant into a gas state, and then enters the U-shaped coil (evaporator) 6. Due to the gas-liquid phase transition, the refrigerant releases cold energy in the U-shaped coil to cool down the materials in the fermentation tank 8.

[0046] The fermentation tank in the brewery is used for beer fermentation and has high requirements for the temperature control of the fermentation liquid. To meet the need for precise temperature control, this system not only sets a conventional control component, the temperature switch 15, to correspondingly control the opening and closing of the solenoid valve 14, but also sets temperature sensors 16 at different upper and lower parts of the fermentation tank to correspondingly control the opening size of the expansion valve 5 to achieve precise temperature control of different parts of the tank body. Before the refrigerant that has released cold energy returns to the compressor, this system also sets an evaporation pressure regulator 17 and a crankcase pressure regulator 18, which can control the pressure in the refrigerant pipeline in real time to avoid excessive pressure and damage to the refrigerant pipeline and its components.

[0047] The system provided by the present utility model has the advantages of convenient construction, high thermal efficiency, waste heat reuse, and precise temperature control. The direct cooling of the fermentation tank by recovering the heat of the high-temperature refrigerant with the high-low temperature two-stage heat exchanger replaces the indirect refrigeration system of the fermentation tank after centralized refrigeration by the unified refrigeration station in the beer and beverage factory. By recovering the heat of the high-temperature heat exchanger 2, hot water at 60°C can be obtained; by recovering the heat of the low-temperature heat exchanger 3, hot water at 35°C can be obtained. Cooling the fermentation tank 8 with the U-shaped coil 6 replaces the cooling structure with a cold plate jacket wound around the circumference of the fermentation tank, facilitating the processing and manufacturing process, greatly reducing the number of welds on the tank body, with small deformation of the tank body, easy polishing treatment inside the tank body, and a smooth and flat inner wall of the tank body. Since the U-shaped coil is made of round tubes with a smooth inner wall, it ensures the smooth flow of the refrigerant medium, reduces the phenomenon of scaling, improves the heat exchange efficiency, and realizes the uniform cooling effect of the up-and-down refrigerant flow and air cooling.

[0048] This system can improve the refrigeration efficiency of the refrigerant, reduce losses, effectively utilize waste heat, save a large amount of electric energy, reduce the emission of water vapor generated by cooling the condenser to the atmosphere in the conventional way, reduce environmental pollution, and realize long-term economic value and social value.

[0049] The above are only the preferred embodiments of the present utility model, and do not impose any limitation on the technical scope of the present utility model. Therefore, any minor modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A direct cooling system for a fermentation tank with reusable energy, characterized in that: It includes a compressor, a heat exchanger, a refrigerant storage tank and a fermentation tank which are connected in a circular manner through pipelines. A plurality of in-line condensing tubes are vertically arranged inside the heat exchanger. A normal temperature water inlet and a hot water outlet after heat exchange are arranged on the side wall of the heat exchanger. A U-shaped coil is arranged on the outer wall of the fermentation tank. A cavity shell is arranged on the outer side of the U-shaped coil. The cavity shell and the outer wall of the fermentation tank form a cavity, and the U-shaped coil is located in the cavity.

2. The energy-reusable direct cooling system for a fermentation tank as claimed in claim 1, characterized in that: The heat exchanger includes a high-temperature heat exchanger and a low-temperature heat exchanger, which are sequentially connected to the pipeline between the compressor and the refrigerant storage tank, and an oil separator is provided on the pipeline between the high-temperature heat exchanger and the low-temperature heat exchanger.

3. The energy-reusable direct cooling system for a fermentation tank as claimed in claim 2, characterized in that: The high-temperature heat exchanger and the low-temperature heat exchanger have the same structure, both comprising an upper head, a lower head and an intermediate cylinder, the upper head and the intermediate cylinder are connected via an upper flange, and the lower head and the intermediate cylinder are connected via a lower flange; The two side walls of the middle cylinder are respectively connected with a water inlet pipeline interface and a water outlet pipeline interface, the top of the upper head is connected with an outlet pipeline, the bottom of the lower head is connected with an inlet pipeline, the inlet pipeline of the high-temperature heat exchanger is connected to the high-pressure output end of the compressor, and the outlet pipeline is connected to the inlet end of the oil separator, the inlet pipeline of the low-temperature heat exchanger is connected to the outlet end of the oil separator, and the outlet pipeline is connected to the inlet end of the refrigerant storage tank.

4. The energy-reusable direct cooling system for a fermentation tank as claimed in claim 3, characterized in that: The interior of the upper flange and the lower flange are respectively connected to an upper fixing rod and a lower fixing rod, and the upper fixing rod and the lower fixing rod are both connected to a semicircular guide plate, and a plurality of circular holes are arranged on the semicircular guide plate, and the in-line condenser tube passes through the circular holes, and the two ends of the in-line condenser tube are respectively connected to the holes on the upper flange and the lower flange.

5. The energy-reusable direct cooling system for a fermentation tank as claimed in claim 1, characterized in that: The U-shaped coil is distributed in multiple sections along the height direction of the fermenter and is spot welded to the outer wall of the fermenter in an up-and-down arrangement. A cavity shell is arranged on the outside of each section of the U-shaped coil, and the cavity shell is spot welded and fixed to the outer wall of the fermenter.

6. The energy-reusable direct cooling system for a fermentation tank as claimed in claim 5, characterized in that: The pipeline between the refrigerant storage tank and the fermentation tank includes a refrigerant main pipe and multiple sections of refrigerant branch pipes. The inlet of the refrigerant main pipe is connected to the outlet end of the refrigerant storage tank, and the outlet of the refrigerant main pipe is connected to the inlet of the refrigerant branch pipe. One section of the refrigerant branch pipe is correspondingly connected to one section of the U-shaped coil. A ball valve, a drying filter and a sight glass are sequentially arranged on the refrigerant main pipe along the flow direction of the refrigerant.

7. The energy-reusable direct cooling system for a fermentation tank as claimed in claim 6, characterized in that: The refrigerant branch pipe is provided with a sight glass, a solenoid valve and an expansion valve in sequence along the flow direction of the refrigerant.

8. The energy-reusable direct cooling system for a fermentation tank as claimed in claim 7, characterized in that: The fermentation tank is connected to multiple temperature switches and multiple temperature sensing bags. One temperature switch corresponds to a solenoid valve on the refrigerant branch pipe, which is used to control the opening and closing of the solenoid valve. One temperature sensing bag corresponds to an expansion valve on the refrigerant branch pipe, which is used to control the opening size of the expansion valve and fine-tune the flow rate of the refrigerant.

9. The energy-reusable direct cooling system for a fermentation tank as claimed in claim 5, characterized in that: An evaporation pressure regulator and a crankcase pressure regulator are provided on the pipeline between the outlet end of the U-shaped coil and the inlet end of the compressor to control the pressure in the pipeline.

10. The energy-reusable direct cooling system for a fermentation tank as claimed in claim 1, characterized in that: The compressor is connected with a high and low pressure switch.

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