Fermentation tank with defoaming recovery device

Abstract

The utility model relates to a fermentation tank with a defoaming recovery device. The fermentation tank structurally comprises an exhaust pipe arranged at the top of a tank body, a gas-liquid separator and a tail gas exhaust pipe, the lower end of the exhaust pipe is communicated with the top of the inner cavity of the tank body, the upper end of the exhaust pipe is communicated with the upper part of the gas-liquid separator, and the lower port of the gas-liquid separator is communicated with the inner cavity of the tank body through a liquid return pipe; a liquid level sensor is arranged on the lower portion of the gas-liquid separator and used for detecting the height of the liquid level gathered on the lower portion of the gas-liquid separator, a liquid return device is arranged at the lower end of the gas-liquid separator, a controller is arranged on the liquid return device, and the controller is in signal connection with the liquid level sensor. The controller is used for receiving signals of the liquid level sensor and controlling the flow of the liquid return device. According to the utility model, fermentation liquor can be prevented from escaping along with fermentation tail gas, the constant volume of the fermentation tank is improved, the use of a defoaming agent can be reduced or avoided, the environmental protection pressure is relieved, and the production cost is reduced.

Description

Technical Field

[0001] This utility model relates to a fermentation tank, specifically a fermentation tank with a defoaming and recovery device. Background Technology

[0002] During the fermentation process, the fermentation liquid in the fermentation tank will produce a large amount of foam. When the foam exceeds the lower end of the exhaust pipe, it will be discharged with the exhaust gas, resulting in the loss of fermentation liquid. Furthermore, the fermentation liquid discharged with the exhaust gas will cause some pollution to the environment.

[0003] To eliminate foam and prevent it from being discharged with the exhaust gas, defoaming slurry is generally used for mechanical defoaming or defoaming agents are used for chemical defoaming. However, mechanical defoaming is inefficient and cannot completely eliminate foam, so some foam will still be discharged with the exhaust gas. Chemical defoaming agents are generally oily substances, organosilicon or compound oil substances. Since new substances are introduced into the fermentation broth, it makes it difficult to separate the subsequent products.

[0004] Therefore, there is an urgent need for a device that can prevent fermentation liquid from escaping with the exhaust gas in the form of foam. Utility Model Content

[0005] The purpose of this invention is to provide a fermenter with a defoaming and recovery device to solve the problem of fermentation liquid loss caused by foam being discharged with the exhaust gas in existing fermenters.

[0006] This invention is implemented as follows: A fermenter with a defoaming and recovery device includes a tank body and an exhaust pipe, a gas-liquid separator, and a tail gas discharge pipe disposed on the top of the tank body; the lower end of the exhaust pipe is connected to the top of the inner cavity of the tank body, and the upper end of the exhaust pipe is connected to the upper part of the gas-liquid separator; the gas-liquid separator is used to break up the foam of fermentation liquid entrained in the gas discharged from the exhaust pipe into liquid through centrifugal force; the lower port of the gas-liquid separator is connected to the inner cavity of the tank body through a return liquid pipe; a liquid level sensor is disposed at the lower part of the gas-liquid separator, which is used to detect the height of the liquid level accumulated at the lower part of the gas-liquid separator; a return liquid device is disposed at the lower end of the gas-liquid separator or on the return liquid pipe, and the return liquid device is signal-connected to a controller; the controller is signal-connected to the liquid level sensor, and the controller is used to receive the signal from the liquid level sensor and control the flow rate of the return liquid device.

[0007] Furthermore, the gas-liquid separator includes a shell, an inner tube, and a lower conical tube. The inner tube is located inside the shell and is coaxial with the shell. The top of the shell is sealed. The lower conical tube is connected to the lower end of the shell. A horizontal cyclone inlet pipe is provided at the upper end of the shell. The cyclone inlet pipe is used to connect with the exhaust pipe. The length direction of the cyclone inlet pipe is tangent to the side wall of the shell. The upper port of the inner tube passes through the top of the shell and communicates with the exhaust pipe. The liquid level sensor is located on the lower conical tube.

[0008] Furthermore, the liquid return device includes a liquid return nozzle, a sterile gas pipeline, and an electrically controlled valve. The sterile gas pipeline is connected to the liquid return nozzle. The port of the liquid return nozzle is located at the lower port of the gas-liquid separator, and the gas outlet direction of the liquid return nozzle is consistent with the port direction of the gas-liquid separator. The electrically controlled valve is located on the sterile gas pipeline and is used to control the flow rate of the sterile gas pipeline. The electrically controlled valve is electrically connected to the controller.

[0009] Furthermore, the return device includes a rotor pump located on the return pipe, and the motor of the rotor pump is electrically connected to the controller.

[0010] Furthermore, a cooling jacket is provided on the exhaust pipe.

[0011] Furthermore, the lower end of the exhaust pipe extends into the tank body, and a foam collection hood is provided at the lower end of the exhaust pipe.

[0012] Furthermore, a rotating shaft is provided inside the tank, the upper part of which extends from the top of the tank and is connected to a power unit. An agitator is provided on the rotating shaft, and defoaming slurry is provided on the upper part of the rotating shaft.

[0013] In the fermenter with defoaming and recovery device of this invention, the foam containing fermentation liquid generated by the fermenter enters the gas-liquid separator through the exhaust pipe along with the exhaust gas. The gas-liquid separator separates the exhaust gas into gas and liquid, breaking down the foam containing fermentation liquid in the exhaust gas into liquid, which is then collected at the bottom of the gas-liquid separator and returned to the fermenter through the liquid return device. This avoids the loss of fermentation liquid and realizes the recovery of fermentation liquid.

[0014] By installing a liquid level sensor in the gas-liquid separator, the amount of separated liquid is detected, and the flow rate of the return liquid device is controlled to quickly drain the separated liquid from the gas-liquid separator.

[0015] The fermenter of this invention uses the aforementioned defoaming and recovery device. It performs preliminary mechanical defoaming treatment using the defoaming slurry inherent in the fermenter itself, breaking up larger foams inside the fermenter. The foam collection hood collects the fermentation exhaust gas containing foam suspended inside the fermenter and collects it into the exhaust pipe. The gas-liquid separator separates the fermentation exhaust gas sent into the exhaust pipe, collects the separated liquid, and discharges the clean fermentation exhaust gas after defoaming. The liquid level sensor monitors the volume of the separated liquid in the gas-liquid separator and adjusts the flow rate of the reflux device to quickly discharge the liquid in the gas-liquid separator back into the tank.

[0016] This invention can prevent fermentation liquid from escaping with fermentation exhaust gas, improve the constant volume of the fermentation tank, reduce or avoid the use of defoaming agents, alleviate environmental pressure and reduce production costs. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the present invention.

[0018] Figure 2 This is a structural diagram of the gas-liquid separator of this utility model.

[0019] Figure 3 This is a schematic diagram of the installation position of the cover of this utility model.

[0020] In the diagram: 1. Tank body; 2. Exhaust pipe; 3. Gas-liquid separator; 4. Tail gas emission pipe; 5. Return liquid pipe; 6. Liquid level sensor; 7. Controller; 8. Electrically controlled valve; 9. Sterile gas pipeline; 10. Return liquid nozzle; 11. Collection hood; 12. Agitator; 13. Motor; 14. Rotating shaft; 15. Defoaming slurry; 3-1. Shell; 3-2. Lower cone pipe; 3-3. Inner pipe; 3-4. Cyclone air inlet pipe; 3-5. Liquid level detection port. Detailed Implementation

[0021] The specific embodiments of this utility model will now be described with reference to the accompanying drawings.

[0022] like Figure 1 , Figure 3As shown, this utility model is a fermenter with a defoaming and recovery device, including a tank body 1 and an exhaust pipe 2, a gas-liquid separator 3, and a tail gas discharge pipe 4 disposed on the top of the tank body 1. The lower end of the exhaust pipe 2 is connected to the top of the inner cavity of the tank body 1, and the upper end of the exhaust pipe 2 is connected to the upper part of the gas-liquid separator 3. The gas-liquid separator 3 is used to break up the foam of fermentation liquid entrained in the gas discharged from the exhaust pipe 2 and convert it into liquid through centrifugal force. The lower port of the gas-liquid separator 3 is connected to the inner cavity of the tank body 1 through a return pipe 5. A liquid level sensor 6 is provided at the lower part of the gas-liquid separator 3. The liquid level sensor 6 is used to detect the height of the liquid level accumulated at the lower part of the gas-liquid separator 3. A return device is provided at the lower end of the gas-liquid separator 3 or on the return pipe 5. The return device is used to send the liquid separated by the gas-liquid separator 3 back into the tank body 1. The return device is signal-connected to a controller 7, and the controller 7 is signal-connected to the liquid level sensor 6. The controller 7 is used to receive the signal from the liquid level sensor 6 and control the flow rate of the return device.

[0023] Among them, such as Figure 2 As shown, the gas-liquid separator 3 includes a shell, an inner tube 3-3, and a lower conical tube 3-2. The shell is cylindrical, and the inner tube 3-3 is located inside the shell and coaxial with it. The lower conical tube 3-2 is connected to the lower end of the shell, and the lower conical tube 3-2 is wider at the top and narrower at the bottom. The upper port of the lower conical tube 3-2 is connected to the lower port of the shell. A horizontal cyclone inlet pipe 3-4 is provided at the upper end of the shell. The cyclone inlet pipe 3-4 is used to connect to the exhaust pipe 2. The length direction of the cyclone inlet pipe 3-4 is tangential to the side wall of the shell. The gas entering the shell 3-1 tangentially from the cyclone inlet pipe 3-4 forms a spiral downward airflow within the shell 3-1. The centrifugal force of the spiral airflow separates the liquid in the exhaust gas. The separated liquid flows along the inner wall of the shell into the lower conical tube 3-2. The upper port of the inner tube 3-3 passes through the top of the shell 3-1 and is connected to the exhaust gas discharge pipe 4. The exhaust gas, which is basically free of liquid after separation, is discharged through the inner tube 3-3 to the exhaust gas discharge pipe 4.

[0024] The liquid level sensor 6 is used to monitor the volume of the separated liquid, so the liquid level sensor 6 is located on the lower conical tube 3-2. A liquid level detection port 3-5 is provided on the side wall of the lower conical tube 3-2, and the liquid level sensor 6 is placed in the liquid level detection port 3-5.

[0025] like Figure 1 , Figure 2As shown, the liquid return device of this utility model includes a liquid return nozzle 10, a sterile gas pipeline 9, and an electrically controlled valve 8. The liquid return nozzle 10 is located at the lower part of the lower cone tube 3-2 of the gas-liquid separator 3. The sterile gas pipeline 9 is connected to the liquid return nozzle 10, and high-pressure sterile gas is supplied to the liquid return nozzle 10 from the sterile gas pipeline 9. The liquid return nozzle 10 is located at the center of the lower port of the lower cone tube 3-2 of the gas-liquid separator 3, and the gas outlet direction of the liquid return nozzle 10 is consistent with the port direction of the lower cone tube 3-2 of the gas-liquid separator 3. When the high-pressure sterile gas passes through the port of the lower cone tube 3-2, a negative pressure is generated in the lower cone tube 3-2, thereby discharging the liquid in the lower cone tube 3-2 with the gas flow. An electrically controlled valve 8 is installed on the sterile gas pipeline 9 to control the flow rate of the sterile gas pipeline 9. The electrically controlled valve 8 is electrically connected to the controller 7. The controller 7 controls the opening degree of the electric valve based on the signal from the liquid level sensor 6, thereby controlling the flow rate of the bacterial gas pipeline, and in turn controlling the flow rate of the liquid discharged from the lower cone tube 3-2.

[0026] To further ensure the gas-liquid separation effect, a cooling jacket is installed on the exhaust pipe 2. The water inlet of the jacket is on top and the water outlet is on the bottom. The fermentation exhaust gas is cooled by cooling water, which facilitates the condensation of water vapor. The cooled fermentation exhaust gas can be better separated into liquid in the gas-liquid separator 3.

[0027] The lower end of the exhaust pipe 2 extends into the tank 1. A foam collection hood 11 is installed at the lower end of the exhaust pipe 2. When the foam generated in the tank 1 is higher than the lower port of the foam collection hood 11, the gas in the tank 1 will carry the foam into the exhaust pipe 2, thus preventing excessive foam from being generated in the tank 1 and affecting the normal fermentation process.

[0028] The foam generated in the fermenter, along with the exhaust gas, enters the gas-liquid separator 3 through exhaust pipe 2. The gas-liquid separator 3 separates the exhaust gas into liquid, collecting the separated liquid at the bottom of the separator. The liquid is then returned to the fermenter via a return liquid device, thus preventing the loss of fermentation broth and achieving broth recovery. By installing a liquid level sensor 6 in the gas-liquid separator 3 to detect the amount of separated liquid and control the flow rate of the return liquid device, the separated liquid in the gas-liquid separator 3 can be quickly drained.

[0029] A rotating shaft 14 is installed inside the tank body 1. The upper part of the rotating shaft 14 extends from the top of the tank body 1 and is connected to a power device, which is generally a motor 13. The motor 13 drives the rotating shaft 14 to rotate. A stirring paddle 12 is installed on the rotating shaft 14. The height of the stirring paddle 12 is lower than the liquid level of the fermentation liquid, which is used to fully stir the fermentation liquid. A defoaming slurry 15 is installed on the upper part of the rotating shaft 14. The height of the defoaming slurry 15 is slightly higher than the liquid level of the fermentation liquid. The foam is broken up by the rake-shaped blades of the defoaming slurry 15.

[0030] like Figure 3As shown, the connection port between the return pipe 5 and the tank body 1 is located behind the collection cover 11 in the direction of rotation of the fermenter agitator 12, and the collection cover 11 has an opening on the side facing the direction of rotation of the agitator 12.

[0031] The fermenter of this invention uses its own defoaming slurry 15 to perform preliminary mechanical defoaming treatment, breaking up larger foams in the fermenter. The foam collection cover 11 collects the fermentation exhaust gas containing foam suspended in the fermenter and puts it into the exhaust pipe 2. The gas-liquid separator 3 separates the fermentation exhaust gas sent into the exhaust pipe 2, collects the separated liquid and discharges the clean fermentation exhaust gas after defoaming. The liquid level sensor 6 monitors the volume of the separated liquid in the gas-liquid separator 3 and adjusts the flow rate of the reflux device to quickly discharge the liquid in the gas-liquid separator 3 back into the tank body 1.

[0032] This invention can prevent fermentation liquid from escaping with fermentation exhaust gas, improve the constant volume of the fermentation tank, reduce or avoid the use of defoaming agents, alleviate environmental pressure and reduce production costs.

Claims

1. A fermenter with a defoaming and recovery device, characterized in that, The system includes a tank body and an exhaust pipe, a gas-liquid separator, and a tail gas emission pipe located on the top of the tank body. The lower end of the exhaust pipe is connected to the top of the inner cavity of the tank body, and the upper end of the exhaust pipe is connected to the upper part of the gas-liquid separator. The gas-liquid separator is used to break up the foam of fermentation liquid entrained in the gas discharged from the exhaust pipe and convert it into liquid through centrifugal force. The lower port of the gas-liquid separator is connected to the inner cavity of the tank body through a return liquid pipe. A liquid level sensor is installed at the lower part of the gas-liquid separator to detect the height of the liquid level accumulated at the lower part of the gas-liquid separator. A return liquid device is installed at the lower end of the gas-liquid separator or on the return liquid pipe. The return liquid device is signal-connected to a controller, which is signal-connected to the liquid level sensor. The controller is used to receive the signal from the liquid level sensor and control the flow rate of the return liquid device.

2. The fermenter with defoaming and recovery device according to claim 1, characterized in that, The gas-liquid separator includes a shell, an inner tube, and a lower conical tube. The inner tube is located inside the shell and is coaxial with the shell. The top of the shell is sealed. The lower conical tube is connected to the lower end of the shell. A horizontal cyclone inlet pipe is provided at the upper end of the shell. The cyclone inlet pipe is used to connect with the exhaust pipe. The length direction of the cyclone inlet pipe is tangent to the side wall of the shell. The upper port of the inner tube passes through the top of the shell and communicates with the exhaust pipe. The liquid level sensor is located on the lower conical tube.

3. The fermenter with defoaming and recovery device according to claim 1, characterized in that, The liquid return device includes a liquid return nozzle, a sterile gas pipeline, and an electrically controlled valve. The sterile gas pipeline is connected to the liquid return nozzle. The port of the liquid return nozzle is located at the lower port of the gas-liquid separator, and the gas outlet direction of the liquid return nozzle is consistent with the port direction of the gas-liquid separator. The electrically controlled valve is located on the sterile gas pipeline and is used to control the flow rate of the sterile gas pipeline. The electrically controlled valve is electrically connected to the controller.

4. The fermenter with defoaming and recovery device according to claim 1, characterized in that, A cooling jacket is provided on the exhaust pipe.

5. The fermenter with defoaming and recovery device according to claim 1, characterized in that, The lower end of the exhaust pipe extends into the tank body, and a foam collection hood is provided at the lower end of the exhaust pipe.

6. The fermenter with defoaming and recovery device according to claim 1, characterized in that, in The tank is equipped with a rotating shaft inside, the upper part of which extends from the top of the tank and is connected to a power unit. An agitator is installed on the rotating shaft, and defoaming slurry is installed on the upper part of the rotating shaft.

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