A fermentation tail gas treatment device

Abstract

This utility model discloses a fermentation exhaust gas treatment device, including a treatment tank for absorbing fermentation exhaust gas. The treatment tank contains an exhaust gas absorption liquid. An air inlet for introducing the fermentation exhaust gas is located at the top of the treatment tank. The air inlet is connected to an exhaust gas distributor via a conduit, and the exhaust gas distributor is located inside the exhaust gas absorption liquid. This allows the fermentation exhaust gas to be evenly distributed into the exhaust gas absorption liquid and absorbed by it. This utility model, through the exhaust gas distributor, evenly distributes the fermentation exhaust gas into the exhaust gas absorption liquid, avoiding the problems of localized concentrated escape and insufficient contact with the absorption liquid caused by direct introduction through the traditional air inlet. This significantly increases the contact area and reaction efficiency between the exhaust gas and the absorption liquid, enabling more effective absorption of acidic and odorous substances and harmful components such as microorganisms in the exhaust gas, thus reducing pollution to the atmospheric environment.

Description

Technical Field

[0001] This utility model relates to a fermentation exhaust gas treatment device. Background Technology

[0002] In the field of aerobic microbial fermentation, engineered bacteria such as Escherichia coli and yeast are widely used. However, the fermentation process requires the introduction of large amounts of air, and the exhaust of this air from the fermenter often leads to serious environmental problems.

[0003] Specifically, the exhaust fumes carry a large amount of acidic-smelling secondary metabolites from microorganisms, as well as microbial cells attached to water vapor. If these substances are directly released into the atmosphere, they will cause air pollution, affecting the surrounding environment and the quality of life of residents.

[0004] In traditional treatment methods, the reaction between exhaust gas and absorbent is insufficient, resulting in low absorption efficiency. Directly introducing exhaust gas into the inlet can lead to localized concentrated escape and inadequate contact with the absorbent, making it difficult to meet environmental protection requirements.

[0005] Therefore, a fermentation exhaust gas treatment device is proposed. Utility Model Content

[0006] The purpose of this invention is to provide a fermentation tail gas treatment device to solve the problem of insufficient contact reaction between tail gas and absorbent liquid and low absorption efficiency in the traditional treatment methods mentioned in the background art.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a fermentation tail gas treatment device, comprising a treatment tank for absorbing fermentation tail gas, wherein the internal device of the treatment tank contains a tail gas absorption liquid. The top of the treatment tank is provided with an air inlet for introducing fermentation exhaust gas. The air inlet is connected to an exhaust gas distributor through a conduit, and the exhaust gas distributor is located inside the exhaust gas absorption liquid, so that the fermentation exhaust gas is evenly distributed into the exhaust gas absorption liquid through the exhaust gas distributor and absorbed by the exhaust gas absorption liquid.

[0008] Preferably, the exhaust gas distributor includes a coil connected to the tail end of the duct, and the upper part of the coil has a plurality of exhaust gas distribution holes.

[0009] Preferably, the coil is spiral conical in shape and is attached to the bottom wall of the processing tank.

[0010] Preferably, the diameter of the exhaust gas distribution hole is 1-5 mm, and the spacing between adjacent exhaust gas distribution holes is 5-10 mm.

[0011] Preferably, the exhaust gas absorbent comprises an aqueous sodium hydroxide solution, and the concentration of the aqueous sodium hydroxide solution is 0.5-2%. Using an aqueous sodium hydroxide solution as the exhaust gas absorbent, with its concentration controlled at 0.5-2%, can effectively neutralize acidic substances in the fermentation exhaust gas and reduce its sour odor. Simultaneously, the aqueous sodium hydroxide solution can also inactivate microorganisms attached to water vapor to a certain extent, reducing the adverse environmental impact of the exhaust gas from multiple aspects and further improving the exhaust gas treatment effect.

[0012] Preferably, the treatment tank is provided with an exhaust gas depressor plate above the exhaust gas distributor, and the exhaust gas depressor plate is located in the exhaust gas absorption liquid. The exhaust gas damping plate includes a lower baffle and an upper baffle arranged sequentially from bottom to top, and both the lower baffle and the upper baffle are provided with a plurality of air guide holes. Both the lower baffle and the upper baffle are conical, and the openings between the lower baffle and the upper baffle are arranged opposite each other, so that the exhaust gas in the exhaust gas distributor is slowly stagnated in the exhaust gas absorption liquid through the lower baffle and the upper baffle.

[0013] Preferably, a channel for exhaust gas discharge is provided between the outer periphery of the lower baffle and the inner wall of the treatment tank, so that the exhaust gas can escape to the outer periphery of the lower baffle and be discharged to the upper baffle through the channel.

[0014] Preferably, a mesh plate is provided in the middle of the upper baffle so that the exhaust gas is discharged to the upper baffle through the mesh plate.

[0015] Preferably, the top of the treatment tank has a gas outlet located next to the air inlet, the outer periphery of the treatment tank has an injection port for inputting exhaust gas absorbent liquid, and the bottom of the treatment tank has an venting end for discharging exhaust gas absorbent liquid.

[0016] Preferably, the total cross-sectional area of ​​the exhaust gas distribution holes is not less than the cross-sectional area of ​​the air inlet or the gas outlet.

[0017] Compared with the prior art, the beneficial effects of this utility model are: This invention uses a tail gas distributor to evenly distribute fermentation tail gas into the tail gas absorption liquid, avoiding the problems of localized concentrated escape of tail gas and insufficient contact with the absorption liquid caused by direct introduction of traditional air inlets. This greatly improves the contact area and reaction efficiency between tail gas and absorption liquid, allowing acidic and odorous substances and harmful components such as microorganisms in the tail gas to be absorbed more effectively, thus reducing pollution to the atmospheric environment.

[0018] The exhaust gas distributor uses a spiral conical coil with several exhaust gas distribution holes of 1-5 mm in diameter and 5-10 mm in spacing on its upper part. This structure and size design is conducive to the rapid and uniform dispersion of exhaust gas after entering the absorbent liquid, increasing the relative movement and collision opportunities between exhaust gas and absorbent liquid, thereby improving absorption efficiency.

[0019] The exhaust gas deceleration plate includes a lower baffle and an upper baffle, both of which are conical with openings facing each other. Exhaust gas must pass through the lower baffle and the upper baffle in sequence to continue rising. This structure makes the flow path of the exhaust gas in the absorbent liquid tortuous, thereby prolonging the contact time between the exhaust gas and the absorbent liquid, allowing more time for harmful substances in the exhaust gas to react with the absorbent liquid, and further improving the adequacy and effectiveness of exhaust gas treatment.

[0020] In addition, the channel between the outer periphery of the lower baffle and the inner wall of the treatment tank, as well as the mesh plate in the middle of the upper baffle, help guide the flow of exhaust gas in the absorbent liquid, so that the exhaust gas can be more evenly distributed in the absorbent liquid, avoiding local exhaust gas concentrations that are too high or too low, and further improving the effect and stability of exhaust gas treatment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2 This is a cross-sectional structural diagram of an embodiment of the present utility model; Figure 3 This is a schematic diagram of the exhaust gas damping plate structure according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of the lower baffle structure according to an embodiment of the present utility model; Figure 5 This is a schematic diagram of the upper baffle structure according to an embodiment of the present utility model; Figure 6 This is a schematic diagram of the exhaust gas distributor according to an embodiment of the present invention.

[0022] In the diagram: 1. Treatment tank; 2. Air inlet; 3. Exhaust gas distributor; 31. Coil; 32. Exhaust gas distribution hole; 4. Exhaust gas buffer plate; 41. Lower baffle; 411. Channel; 42. Upper baffle; 421. Mesh plate; 43. Air guide hole; 5. Gas outlet; 6. Inlet; 7. Exhaust end. Detailed Implementation

[0023] To address the problem of insufficient contact and reaction between the exhaust gas and the absorbent liquid, resulting in low absorption efficiency in traditional treatment methods, this invention provides a fermentation exhaust gas treatment device. The technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0024] Please see Figure 1-6 This utility model provides a fermentation tail gas treatment device, including a treatment tank 1 for absorbing fermentation tail gas. The internal device of the treatment tank 1 contains a tail gas absorption liquid, which includes an aqueous solution of sodium hydroxide, and the concentration of the aqueous solution of sodium hydroxide is 0.5-2%.

[0025] The top of the treatment tank 1 is provided with an air inlet 2 for introducing fermentation exhaust gas. The air inlet 2 is connected to an exhaust gas distributor 3 through a conduit. The exhaust gas distributor 3 is located inside the exhaust gas absorption liquid so that the fermentation exhaust gas is evenly distributed into the exhaust gas absorption liquid through the exhaust gas distributor 3 and absorbed by the exhaust gas absorption liquid.

[0026] The exhaust gas distributor 3 includes a coil 31 connected to the tail end of a duct, and the upper part of the coil 31 has several exhaust gas distribution holes 32. The coil 31 is spiral conical in shape and is attached to the bottom wall of the treatment tank 1. The diameter of the exhaust gas distribution holes 32 is 1-5 mm, and the distance between adjacent exhaust gas distribution holes 32 is 5-10 mm. The total cross-sectional area of ​​the exhaust gas distribution holes 32 is not less than the cross-sectional area of ​​the air inlet 2 or the gas outlet 5.

[0027] The treatment tank 1 is located above the exhaust gas distributor 3 and is equipped with an exhaust gas depressant plate 4, which is situated within the exhaust gas absorption liquid. The exhaust gas depressant plate 4 includes a lower baffle 41 and an upper baffle 42 arranged sequentially from bottom to top. Both the lower baffle 41 and the upper baffle 42 have several air guide holes 43. Both the lower baffle 41 and the upper baffle 42 are conical, and their openings are opposite to each other, allowing the exhaust gas in the exhaust gas distributor 3 to be slowly depressed in the exhaust gas absorption liquid through the lower baffle 41 and the upper baffle 42. A channel 411 for exhaust gas outflow is formed between the outer periphery of the lower baffle 41 and the inner wall of the treatment tank 1, allowing the exhaust gas to escape to the outer periphery of the lower baffle 41 and be outflowed to the upper baffle 42 through the channel 411. A mesh plate 421 is provided in the middle of the upper baffle 42, allowing the exhaust gas to be outflowed onto the upper baffle 42 through the mesh plate 421.

[0028] The top of the treatment tank 1 is provided with a gas outlet 5 next to the air inlet 2, the outer periphery of the treatment tank 1 is provided with an injection port 6 for inputting exhaust gas absorbent liquid, and the bottom of the treatment tank 1 is provided with an exhaust end 7 for discharging exhaust gas absorbent liquid.

[0029] The working principle of the fermentation tail gas treatment device provided by this utility model is as follows: the fermentation tail gas is introduced from the air inlet 2 at the top of the treatment tank 1, and the air inlet 2 is connected to the tail gas distributor 3 located inside the tail gas absorption liquid through a conduit. After the tail gas enters the conduit, it first enters the tail gas distributor 3 and is released into the tail gas absorption liquid through the tail gas distribution holes 32.

[0030] After the exhaust gas is released into the exhaust gas absorption liquid in the form of small bubbles from the exhaust gas distributor 3's exhaust gas distribution holes 32, it will have sufficient contact and reaction with the absorption liquid. The exhaust gas absorption liquid can effectively neutralize acidic substances in the fermentation exhaust gas, such as some organic acids in microbial secondary metabolites, thereby reducing the sour smell of the exhaust gas. At the same time, the sodium hydroxide aqueous solution can also inactivate the microbial cells attached to the water vapor in the exhaust gas to a certain extent. By destroying the cell walls of the cells or changing their internal physiological environment, the microorganisms lose their activity, further reducing the risk of exhaust gas pollution to the environment.

[0031] An exhaust gas deceleration plate 4 is installed in the exhaust gas absorbent liquid, located above the exhaust gas distributor 3 and submerged within the absorbent liquid. When the exhaust gas is released from the exhaust gas distributor 3 into the absorbent liquid and begins to rise, it passes sequentially through the lower baffle 41 and the upper baffle 42. Due to the conical structure of the lower baffle 41 and the upper baffle 42 and their opposing openings, the exhaust gas is obstructed and guided during its ascent, making its flow path tortuous and thus prolonging its residence time in the absorbent liquid. This allows more time for harmful substances in the exhaust gas to react with the absorbent liquid, further improving the adequacy and effectiveness of exhaust gas treatment. Meanwhile, a channel 411 for exhaust gas discharge is provided between the outer periphery of the lower baffle 41 and the inner wall of the treatment tank 1. When the exhaust gas rises to the outer periphery of the lower baffle 41, it will be discharged to the upper baffle 42 through the channel 411. A mesh plate 421 is provided in the middle of the upper baffle 42. The exhaust gas will eventually be discharged to the upper baffle 42 through the mesh plate 421 and continue its upward path.

[0032] After being treated by the exhaust gas absorption liquid, the exhaust gas continues to rise and exits the treatment tank 1 through the gas outlet 5 located at the top of the treatment tank 1 next to the air inlet 2. At this point, a large amount of acidic and odorous substances and harmful components such as microorganisms in the exhaust gas have been removed, greatly reducing the degree of pollution to the atmospheric environment and meeting environmental emission standards, thus achieving compliant exhaust gas emissions.

[0033] To ensure the absorption effect of the exhaust gas absorbent, the treatment tank 1 has an inlet 6 for inputting the exhaust gas absorbent and an outlet 7 for discharging the exhaust gas absorbent at the bottom. During use, when the absorption capacity of the exhaust gas absorbent decreases to a certain level, the absorbent can be discharged through the outlet 7, and then fresh exhaust gas absorbent can be re-injected through the inlet 6 to maintain the efficient operation of the entire exhaust gas treatment device.

[0034] Meanwhile, the total cross-sectional area of ​​the exhaust gas distribution holes 32 is not less than the cross-sectional area of ​​the air inlet 2 or the gas outlet 5. This design ensures that the exhaust gas can flow smoothly throughout the entire treatment process, avoids excessive local pressure, and ensures the stable operation of the device.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fermentation off-gas treatment apparatus, characterized by: Includes a treatment tank (1) for absorbing fermentation exhaust gas, the internal device of which contains exhaust gas absorption liquid. The top of the treatment tank (1) is provided with an air inlet (2) for introducing fermentation tail gas. The air inlet (2) is connected to a tail gas distributor (3) through a conduit. The tail gas distributor (3) is located inside the tail gas absorption liquid so that the fermentation tail gas is evenly distributed to the tail gas absorption liquid through the tail gas distributor (3) and absorbed by the tail gas absorption liquid. The exhaust gas distributor (3) includes a coil (31) connected to the tail end of the duct. The upper part of the coil (31) is provided with a plurality of exhaust gas distribution holes (32). The diameter of the exhaust gas distribution holes (32) is 1-5 mm, and the distance between adjacent exhaust gas distribution holes (32) is 5-10 mm.

2. The apparatus for treating fermentation off-gas according to claim 1, wherein: The coil (31) is spiral conical in shape and is attached to the bottom wall of the processing tank (1).

3. A device for treating fermentation off-gas according to claim 2, characterized in that: The exhaust gas absorbent includes an aqueous solution of sodium hydroxide.

4. A device for treating fermentation off-gas according to claim 3, characterized in that: The treatment tank (1) is located above the exhaust gas distributor (3) and is provided with an exhaust gas depressor plate (4), and the exhaust gas depressor plate (4) is located in the exhaust gas absorption liquid. The exhaust gas damping plate (4) includes a lower baffle (41) and an upper baffle (42) arranged sequentially from bottom to top, and a plurality of air guide holes (43) are provided at both the lower baffle (41) and the upper baffle (42). The lower baffle (41) and the upper baffle (42) are both cone-shaped, and the openings between the lower baffle (41) and the upper baffle (42) are arranged opposite to each other, so that the exhaust gas in the exhaust gas distributor (3) is slowly stagnated in the exhaust gas absorption liquid through the lower baffle (41) and the upper baffle (42).

5. A device for treating fermentation off-gas according to claim 4, characterized in that: A channel (411) for exhaust gas discharge is provided between the outer periphery of the lower baffle (41) and the inner wall of the treatment tank (1), so that the exhaust gas can escape to the outer periphery of the lower baffle (41) and be discharged to the upper baffle (42) through the channel (411).

6. A device for treating fermentation off-gas according to claim 5, characterized in that: A mesh plate (421) is provided in the middle of the upper baffle (42) so that the exhaust gas is discharged to the upper baffle (42) through the mesh plate (421).

7. The apparatus for treating fermentation off-gas according to claim 1, wherein: The top of the treatment tank (1) is provided with a gas outlet (5) on the side of the air inlet (2), and the outer periphery of the treatment tank (1) is provided with an injection port (6) for inputting tail gas absorption liquid. The bottom of the treatment tank (1) is provided with an empty end (7) for discharging tail gas absorption liquid.

8. A device for treating fermentation off-gas according to claim 7, characterized in that: The total cross-sectional area of ​​the exhaust gas distribution hole (32) is not less than the cross-sectional area of ​​the air inlet (2) or the gas outlet (5).

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