High-viscosity fermentation adjustable multi-groove plate air distributor and application

Abstract

The invention relates to a high-viscosity fermentation adjustable multi-slot plate air distributor and application, and belongs to the technical field of distributors, the high-viscosity fermentation adjustable multi-slot plate air distributor comprises an air inlet, an air outlet, an air inlet pipe, a slotted flat plate, a U-shaped flat plate, a standard bolt and a corresponding nut. Through the multi-groove nozzle assembly formed by the multiple vertical parallel plates, the gap between the flat plates can be adjusted, the size of the hole diameter of the nozzle can be adjusted, the blocking possibility is reduced, and stable air supply is guaranteed. And a corrosion-resistant material with a smooth surface is selected, so that the service life of the distributor is prolonged, and the distributor is convenient to clean and maintain. The air distributor can provide proper fermentation ventilation conditions, increase the gas-liquid contact area, improve the transmission efficiency of oxygen, meet the requirements of microorganisms on oxygen, and facilitate the smooth proceeding of the fermentation process.

Description

Technical Field

[0001] This invention relates to an adjustable multi-slot air distributor for high-viscosity fermentation and its application, belonging to the field of distributor technology. Background Technology

[0002] An air distributor is a device installed inside a fermenter (mostly located at the bottom of the fermenter). Its main function is to divide the large cylindrical airflow entering the fermenter into many fine airflows, so that the air can be evenly dispersed in the fermentation liquid, increasing the gas-liquid contact area, thereby improving the oxygen transfer efficiency and providing sufficient oxygen for the growth and metabolism of microorganisms.

[0003] Current general-purpose air distributors suffer from poor bubble dispersion, weak mixing, easy clogging, low mass transfer efficiency, and difficult subsequent cleaning in high-viscosity fermentation broths. This invention designs an air distributor suitable for high-viscosity fermentation broths to solve the problems mentioned above. This air distributor can break the incoming air into many fine feather-like bubbles, increasing the gas-liquid contact area and improving the oxygen transfer efficiency from the gas phase to the liquid phase, thus meeting the oxygen requirements of microorganisms. Furthermore, the airflow and stirring action it generates facilitate the transfer and exchange of oxygen, carbon dioxide, and other metabolic products in the fermentation broth, maintaining the balance of the fermentation system and promoting the smooth progress of the fermentation process. It is suitable for improving the air distribution in high-viscosity fermentation broths. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a high-viscosity fermentation adjustable multi-slot plate air distributor. The air distributor of this invention features a multi-slot nozzle assembly composed of multiple vertical parallel plates. The nozzle orifice size can be adjusted by regulating the gaps between the plates, reducing ventilation problems caused by fermentation liquid clogging the pores and ensuring a stable air supply. The use of materials with strong corrosion resistance and high surface smoothness ensures that the distributor will not be corroded or damaged during long-term fermentation, extending its service life, and also reduces the adhesion and accumulation of fermentation liquid and impurities on the surface of the air distributor, facilitating cleaning and maintenance.

[0005] The technical solution of the present invention is as follows: A high-viscosity fermentation adjustable multi-slot plate air distributor includes slotted plates and U-shaped plates. The number of slotted plates is at least two, and the U-shaped plate is set between two adjacent slotted plates. The slotted plates are provided with air inlets, which are connected to external air inlets. The U-shaped opening of the U-shaped plate between the two slotted plates is an air outlet. The adjacent slotted plates and U-shaped plates are connected by bolts.

[0006] Preferably, the number of slotted plates is at least three, including one front plate, at least one clamping plate, and one rear plate; the front plate has an air inlet and is connected to the air inlet pipe, the clamping plate is in the middle, and the rear plate is at the end; the front plate and the clamping plate have through holes as air intake channels, while the rear plate does not have through holes. U-shaped plates are provided between the front plate and the clamping plate, between the clamping plates, and between the clamping plate and the rear plate. The through holes between the front plate and the clamping plate form the main air intake channel, which is blocked by the rear plate. The U-shaped opening of each U-shaped plate and the gap between the plates serve as air outlets.

[0007] The plates are connected by standard bolts (GB / T 5783 M6×80 A2-70) and corresponding nuts (GB / T 6170 M6A2-70).

[0008] The number and spacing of the vertical parallel plates in the multi-groove nozzle assembly can be adjusted according to the viscosity of the fermentation broth and the aeration requirements.

[0009] The distributor of this invention adopts a parallel slit nozzle array, with multiple vertical parallel plates forming a multi-slit nozzle assembly. Each U-shaped plate has a U-shaped milled groove of a specific depth to form a slit. Unlike the traditional air distributor structure, this design can generate a three-dimensional bubble plume flow, providing a new way for gas to disperse in liquids and changing the gas dispersion morphology of traditional distributors.

[0010] The way the distributor is constructed allows for simple maintenance, repair, and replacement of individual components when needed.

[0011] Preferably, the material selection for the distributor includes porous ceramic, sintered stainless steel ceramic, or polytetrafluoroethylene, to replace the traditional metal material for generating bubbles. By using porous materials, micron-sized fine bubbles can be generated in the bioreactor, increasing the gas-liquid interface area, contact exchange time, and mass transfer efficiency, thereby improving the oxygen uptake rate of the bioreactor.

[0012] Further preferably, the slotted plate and U-shaped plate of the distributor are coated with a corrosion-resistant coating. Because the distributor structure allows for quick disassembly, each plate can be made of various corrosion-resistant materials or coated with a corrosion-resistant coating, enabling it to adapt to various working environments, including highly corrosive chemical conditions.

[0013] Further preferably, the distributor connector is made of 316L stainless steel substrate, with a silicon nitride ceramic coating sprayed on the surface. The coating thickness is 20 μm, the surface roughness Ra≤0.2 μm, and the corrosion resistance is improved by 5 times.

[0014] A fermenter including a high-viscosity fermentation adjustable multi-slot plate air distributor, the fermenter includes a tank body, a stirring paddle is provided in the tank body for stirring the contents of the tank body, the high-viscosity fermentation adjustable multi-slot plate air distributor is provided at the bottom of the tank body, the air inlet of the air distributor is connected to one end of the air inlet pipe, and the other end of the air inlet pipe is connected to an external air supply device.

[0015] Preferably, the fermenter including the high-viscosity fermentation adjustable multi-slot plate air distributor also includes a detection device. The detection device is set on the air inlet pipe outside the tank body. The detection device is a real-time flow meter, which is used to monitor and control the air flow rate in real time, thereby enhancing the controllability of the air flow rate of the air distributor.

[0016] A method for operating a fermenter including a high-viscosity fermentation adjustable multi-slot plate air distributor includes the following steps: The number of slotted plates in the high-viscosity fermentation adjustable multi-slot air distributor is selected based on the size of the fermentation broth and the tank, thereby determining the number and distribution of air outlets. The size of the connection gap between the slotted plates is determined by controlling the bolts connecting the slotted plates and the U-shaped plates. The gas flow rate is set for fermentation. The slotted plates and the U-shaped plates form parallel vertical plates. The bubble size (20-200 μm) is controlled by adjusting the number of plates, the plate spacing (0.2-2 mm), and the gas flow rate to avoid clogging of the fermentation broth.

[0017] This air distributor allows for flexible parameter adjustment, and the number of plates can be freely selected. The size of the exhaust holes can be controlled by adding or removing slotted plates. The tightness between the plates can be controlled by bolts. By changing the slit width, the size of the plates and array, and the gas flow rate, the properties of the bubble plume (such as size distribution, formation frequency, and population density) can be modified within a wide range to adapt to different application scenarios.

[0018] Preferably, the plate spacing can be adjusted within the range of 0.2mm-2mm.

[0019] Preferably, the bolts connecting the plates are M6 high-strength bolts with a preload controlled at 18-22 kN. Elastic washers are provided between the bolts and the plate surface. The elastic washer design ensures structural stability under vibration.

[0020] This invention, through a specially designed strip-shaped nozzle structure, effectively overcomes the obstruction of bubble dispersion by high-viscosity fermentation broth, achieving efficient and uniform dispersion of the large airflow into fine and stable feather-shaped bubbles, significantly improving gas-liquid mass transfer efficiency under high viscosity conditions. Simultaneously, while ensuring efficient dispersion, this design, through replaceable connecting components, effectively solves the common clogging problem in existing technologies for high-viscosity fermentation broths, and may improve the macroscopic mixing effect of the fermentation broth. Therefore, compared to existing air distributors suitable for conventional or high-viscosity fermentation broths, this invention represents a more significant technological advancement and innovation in maintaining fermentation system balance and meeting the high-oxygen requirements of microorganisms.

[0021] The beneficial effects of this invention are as follows: (1) Innovative design and production of a multi-point distributor composed of multi-slot disperser structural units. By constructing a set of parallel slot nozzles and forming a certain spray angle, a dense three-dimensional distribution of feather-shaped bubbles in the middle is created, solving the problem that single-point distributors cannot achieve high flow rate air and realizing precise control of temperature difference in fermentation system.

[0022] (2) The air distributor structure allows for easy modification of parameters such as the number, thickness, length, spacing of the slits, and the material of the plate to adapt to different process or research needs. For example, in the experiment, the effect of adjusting these parameters on bubble generation was observed, demonstrating the flexibility of the structure in design and its ability to be customized according to actual application scenarios.

[0023] (3) The air distributor is constructed without relying on fine holes or drilling, but rather by assembling slits from simple plates. This allows it to be made of a variety of materials or with different coatings applied to the plate surface, enabling it to work under various physical scales and contact material conditions, adapting to a variety of harsh chemical environments, greatly expanding its application range, and meeting the needs of production from high-viscosity fermentation broth.

[0024] (4) It can provide suitable fermentation ventilation conditions, increase the gas-liquid contact area, improve the oxygen transfer efficiency, meet the oxygen demand of microorganisms, and facilitate the smooth progress of the fermentation process.

[0025] (5) It is equipped with a monitoring device that can monitor the air flow and distribution in real time so as to adjust and optimize the fermentation process in a timely manner. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the fermenter structure in use, including the high-viscosity fermentation adjustable multi-slot plate air distributor of the present invention; Figure 2 This is a three-dimensional schematic diagram of the high-viscosity fermentation adjustable multi-slot plate air distributor of the present invention; Figure 3This is a top view of the high-viscosity fermentation adjustable multi-trough plate air distributor of the present invention; Figure 4 This is a right view of the high-viscosity fermentation adjustable multi-trough plate air distributor of the present invention; Figure 5 This is a front view of the front panel of the slotted flat plate of the present invention; Figure 6 This is a front view of the clamping plate of the slotted flat plate of the present invention; Figure 7 This is a front view of the rear plate of the slotted flat plate of the present invention; Figure 8 This is a front view of the U-shaped flat plate of the present invention; Figure 9 This is a schematic diagram of a conventional circular air distributor; Figure 10 This is a schematic diagram of a disc-type air distributor. Figure 11 This is a schematic diagram of the combined air distributor of this application; Figure 12 for Figure 9 The image shows the gas holdup cloud map of a conventional annular air distributor. Figure 13 for Figure 10 The image shows the gas holdup cloud map of the disc-type air distributor. Figure 14 for Figure 11 The image shown is a cloud map of the gas holdup of the combined air distributor of this application. Figure 15 for Figure 9 The streamline diagram of a conventional annular air distributor is shown below. Figure 16 for Figure 10 The streamline diagram of the disc-type air distributor is shown below. Figure 17 for Figure 11 The streamline diagram of the combined air distributor of this application is shown below; Figure 18 for Figure 9 The diagram shows the shear strain rate of water in a conventional annular air distributor. Figure 19 for Figure 10 The diagram shows the shear strain rate of water in a disc-type air distributor. Figure 20 for Figure 11 The diagram shows the shear strain rate of water in the combined air distributor of this application. Figure 21 for Figure 9 The vector diagram shows the velocity of a conventional circular air distributor. Figure 22 for Figure 10 The vector diagram of the speed of the disc-shaped air distributor is shown. Figure 23 for Figure 11 The vector diagram shown is of the velocity of the combined air distributor of this application; Figure 24 for Figure 9 The shear rate contour plot of a conventional annular air distributor is shown. Figure 25 for Figure 10 The shear rate contour plot of the disc-type air distributor is shown. Figure 26 for Figure 11 The image shown is a shear rate contour plot of the combined air distributor of this application. Among them, 1. front plate of slotted plate, 2. clamping plate of slotted plate, 3. U-shaped plate, 4. rear plate of slotted plate, 5. screw hole, 6. air inlet, 7. air outlet, 8. blade of fermentation tank agitator, 9. shaft collar in the center of agitator, 10. vertical shaft in the center of agitator, 11. air distributor, 12. air inlet pipe, 13. detection device, 14. tank body. Detailed Implementation

[0027] The present invention will be further described below with reference to the embodiments and accompanying drawings, but is not limited thereto. Example

[0028] A high-viscosity fermentation adjustable multi-slot plate air distributor includes slotted plates and U-shaped plates 3. The U-shaped plates are positioned between two adjacent slotted plates; the U-shaped opening of the U-shaped plate between the two slotted plates serves as an air outlet 7; the adjacent slotted plates and U-shaped plates are connected by bolts. Figure 2 , 3 As shown in Figure 4, there are 5 slotted plates, including 1 front plate, 3 clamping plates, and 1 rear plate. The front plate 1 is the one with the air inlet 6 connected to the air intake pipe 12. Figure 5 As shown. The middle part is clamping plate 2, as... Figure 6 As shown. Finally, there is the back panel 4, as... Figure 7 As shown. Both the front panel and the clamping plate have through holes as air intake channels, while the rear panel does not have through holes. U-shaped flat plates are installed between the front panel and the clamping plate, between the clamping plates, and between the clamping plate and the rear panel. The through holes between the front panel and the clamping plate form the main air intake channel. After being blocked by the rear panel, the U-shaped openings of each U-shaped flat plate and the gaps between the plates serve as air outlets.

[0029] The plates are connected by standard bolts (GB / T 5783 M6×80 A2-70) and corresponding nuts (GB / T 6170 M6A2-70).

[0030] The number and spacing of the vertical parallel plates in the multi-groove nozzle assembly can be adjusted according to the viscosity of the fermentation broth and the aeration requirements.

[0031] The distributor of this invention adopts a parallel slit nozzle array, with multiple vertical parallel plates forming a multi-slit nozzle assembly. Each U-shaped plate has a U-shaped milled groove of a specific depth to form a slit. Unlike the traditional air distributor structure, this design can generate a three-dimensional bubble plume flow, providing a new way for gas to disperse in liquids and changing the gas dispersion morphology of traditional distributors.

[0032] The way the distributor is constructed allows for simple maintenance, repair, and replacement of individual components when needed.

[0033] The distributor connector is made of 316L stainless steel with a silicon nitride ceramic coating. The coating thickness is 20 μm, the surface roughness Ra≤0.2 μm, and the corrosion resistance is improved by 5 times. Example

[0034] A fermenter including the high-viscosity fermentation adjustable multi-slot plate air distributor described in Example 1, such as Figure 1 As shown, the fermentation tank includes a tank body 14, and a stirring paddle is installed inside the tank body. The stirring paddle is used to stir the contents inside the tank body. A high-viscosity fermentation adjustable multi-slot plate air distributor is installed at the bottom of the tank body. The air inlet of the air distributor is connected to one end of the air inlet pipe, and the other end of the air inlet pipe is connected to an external air supply device.

[0035] The fermenter, which includes a high-viscosity fermentation adjustable multi-slot plate air distributor, also includes a detection device. The detection device is installed on the air inlet pipe outside the tank. The detection device is a real-time flow meter, which is used to monitor and control the air flow rate in real time, thereby enhancing the controllability of the air flow rate of the air distributor. Example

[0036] A method for operating a fermenter including a high-viscosity fermentation adjustable multi-slot plate air distributor includes the following steps: The number of slotted plates in the high-viscosity fermentation adjustable multi-slot air distributor is selected based on the viscosity of the fermentation broth, the size of the tank, and the aeration requirements, thereby determining the number and distribution of air outlets. The size of the connection gap between the slotted plates is determined by controlling the bolts connecting the slotted plates and the U-shaped plates. The gas flow rate is set for fermentation. The slotted plates and the U-shaped plates form parallel vertical plates. The bubble size (20-200 μm) is controlled by adjusting the number of plates, the plate spacing (0.2-2 mm), and the gas flow rate to avoid clogging of the fermentation broth.

[0037] The bolts connecting the plates are M6 high-strength bolts, with preload controlled between 18-22 kN. Elastic washers are installed between the bolts and the plate surfaces, ensuring structural stability under vibration. This air distributor allows for flexible parameter adjustment; the number of plates can be freely selected, and the size of the exhaust ports can be controlled by adding or removing slotted plates. The tightness of the bolts between the plates can be controlled. By changing the slit width, plate and array dimensions, and gas flow rate, the properties of the bubble plume (such as size distribution, formation frequency, and population density) can be modified within a wide range to adapt to different application scenarios.

[0038] Comparative Example 1 Conventional air distributors, such as Figure 9 As shown, the original air distributor was a circular air distributor.

[0039] Comparative Example 2 An improved air distributor, such as Figure 10 As shown, this is a disc-type distributor with strip-shaped air outlets on the disc, and the air outlets are pointing upwards.

[0040] Experimental Example Bioreactors provide a sterile environment and a suitable fluid dynamic environment for high-density microbial culture, primarily involving agitation, aeration, and turbulence. For aerobic microbial culture, air distributors provide mass transfer kinetic energy to the flow field within the reactor, ensuring a continuous and stable flow field and energy, momentum, and mass transfer throughout the reactor, thus providing a stable and suitable environment for the physiological metabolism of the microorganisms. Based on CFD technology, simulation calculations and analyses of the flow field characteristics of reactors configured with different air distributors were performed. The results showed that the optimized air distributor, when applied to a 10 L fermenter, improved the fermentation flow field characteristics, thereby achieving high-density culture.

[0041] Using the air distributor shown in Embodiment 1 of the present invention (structural schematic shown as follows) Figure 11 As shown, this is a modular air distributor, which assembles different designed plates together to form strip-shaped air outlets (with the air outlet pointing upwards). Fermentation experiments were conducted using this air distributor in Comparative Examples 1 and 2, comparing it with other air distributors in various aspects, including gas holdup, streamline diagrams plotted at the air outlet, water shear strain rate, velocity vector diagram, and shear rate contour plot. The following results were obtained.

[0042] I. Gas holdup Gas holdup is the volume fraction of the gas phase in the gas-liquid mixture of the fermentation broth, and is represented by gas holdup cloud maps of three different air distributors ( Figures 12-14As can be seen, air enters from the bottom of the fermenter through the air distributor and, with the flow of the entire stirred flow field, eventually escapes from the surface of the fermentation broth at the top. This demonstrates the impact of assembling three different air distributors on the overall and local air distribution within the reactor. The original gas distributor (Comparative Example 1) had an almost zero gas holdup in most of the upper layer of the fermentation broth. The gas distributor in Comparative Example 2 showed a certain improvement in the overall gas holdup, especially in the air distributor of this application, where the gas holdup in most of the upper layer of the fermentation broth was significantly higher than that of the original control group air distributor. Therefore, the optimized air distributor of this application performs better.

[0043] II. Streamline diagram drawn at the air outlet Fermentation tank flow diagrams are core reference materials for equipment operation, maintenance, and process optimization. By visually displaying fluid paths and system structure, they ensure the standardization and safety of the production process. From the flow diagram results ( Figures 15-17 Compared to the original air distributor in Comparative Example 1, which generated fewer vortices, both Comparative Example 2 and the design in this application generated more and stronger vortices. In particular, the design in this application generated the most and strongest vortices, resulting in better dissolved oxygen mass transfer. Therefore, the air distributor in this application is more effective.

[0044] III. Shear Strain Rate of Water Shear strain rate reflects the velocity difference between liquids, as seen in the contour plot ( Figures 18-20 The shear strain is mainly concentrated on the wall surface (due to the presence of the boundary layer), the distributor inlet (ejected airflow), the vortex region, and the flow area caused by the rotation of the rotating impeller. The shear strain rates of the original air distributor in Comparative Example 1 and the water in Comparative Example 2 are not ideal, with excessively high shear rates in the middle and bottom, which adversely affect the fermentation process. The shear rate of this application is slightly lower, which is more conducive to the stability and efficiency of the fermentation process. Therefore, this application is more effective.

[0045] IV. Velocity Vector Graphics Velocity vector diagrams can intuitively characterize the flow field characteristics within a reactor, such as... Figures 21-23 As shown, excessively high fermentation broth flow velocity can lead to uneven mixing of the liquid within the fermenter, affecting nutrient transfer and the distribution of metabolic products. Conversely, excessively low flow velocity can result in insufficient mixing, impacting fermentation efficiency. Comparative Example 2 exhibits the least ideal fermentation broth flow velocity distribution because the flow velocities in the middle and bottom are excessively high, potentially adversely affecting the fermentation process. Comparative Example 1's original air distributor has an excessively low fermentation broth flow velocity, impacting fermentation efficiency. The water flow velocity distribution in this application is the most ideal, contributing to the stability and efficiency of the fermentation process, and enhancing the turbulence effect within the fermenter, resulting in better mixing and mass transfer.

[0046] V. Shear Rate Contour The shear rate contour map of a fermenter is a visualization tool generated through computational fluid dynamics (CFD) simulation. It is used to visually display the shear rate distribution of the fluid at different locations within the fermenter. It marks the spatial variation of the shear rate (unit: s⁻¹) using color or contour lines, and is of great guiding significance for fermentation process optimization, equipment design, and process control.

[0047] Based on the calculation results ( Figures 24-26 The bubbles in this application are relatively small. In contrast, the bubbles in the original air distributor in Comparative Example 1 are very large and are mainly concentrated in the area from the air outlet to the rotating shaft. This is because the outlet of the original air distributor is the smallest and the flow rate is the fastest until it is broken up at the rotating impeller and becomes smaller bubbles in the liquid phase.

[0048] If the goal is to allow the gas to remain in the water for a longer period of time, the air distributor designed in this application is the best choice. The bubbles are relatively smaller, which means that more air is dispersed into the liquid phase.

[0049] As can be seen from the above embodiments and experimental examples, the air distributor for high-viscosity fermentation broth provided by the present invention has the advantages of good ventilation performance, stable air supply, long service life and easy maintenance. It is suitable for various high-viscosity fermentation processes and has broad application prospects.

Claims

1. A high-viscosity fermentation adjustable multi-slot plate air distributor, characterized in that, It includes slotted plates and U-shaped plates. There are at least two slotted plates and the U-shaped plates are set between two adjacent slotted plates. The slotted plates are provided with air inlets, which are connected to external air inlets. The U-shaped opening of the U-shaped plate between the two slotted plates is the air outlet. Adjacent slotted plates and U-shaped plates are connected by bolts.

2. The high-viscosity fermentation adjustable multi-trough plate air distributor according to claim 1, characterized in that, The number of slotted plates is at least three, including one front plate, at least one clamping plate, and one rear plate; the front plate is the one with the air inlet and connected to the air inlet pipe, the clamping plate is in the middle, and the rear plate is at the end; the front plate and the clamping plate are provided with through holes as air inlet channels, while the rear plate is not provided with through holes.

3. The high-viscosity fermentation adjustable multi-trough plate air distributor according to claim 1, characterized in that, The distributor can be made of porous ceramic, sintered stainless steel ceramic, or polytetrafluoroethylene.

4. The high-viscosity fermentation adjustable multi-trough plate air distributor according to claim 1, characterized in that, A corrosion-resistant coating is applied to the surface of the slotted plate and U-shaped plate of the distributor.

5. The high-viscosity fermentation adjustable multi-trough plate air distributor according to claim 4, characterized in that, The distributor is made of 316L stainless steel substrate, with a silicon nitride ceramic coating sprayed on the surface. The coating thickness is 20 μm and the surface roughness Ra≤0.2 μm.

6. A fermenter comprising the high-viscosity fermentation adjustable multi-slot plate air distributor according to any one of claims 1-5, characterized in that, The fermentation tank includes a tank body, and a stirring paddle is installed inside the tank body. The stirring paddle is used to stir the contents inside the tank body. The aforementioned high-viscosity fermentation adjustable multi-slot plate air distributor is installed at the bottom of the tank body. The air inlet of the air distributor is connected to one end of the air inlet pipe, and the other end of the air inlet pipe is connected to an external air supply device.

7. The fermenter according to claim 6, comprising a high-viscosity fermentation adjustable multi-slot plate air distributor, characterized in that, The fermenter, which includes a high-viscosity fermentation adjustable multi-slot plate air distributor, also includes a detection device. The detection device is installed on the air inlet pipe outside the tank and is a real-time flow meter used to monitor and control the air flow rate in real time.

8. A method for operating a fermenter including a high-viscosity fermentation adjustable multi-slot plate air distributor, characterized in that, The steps include the following: Select the number of slotted plates in the high-viscosity fermentation adjustable multi-slot air distributor according to the size of the fermentation broth and the tank; determine the size of the connection gap between the slotted plates by controlling the bolts connecting the slotted plates and the U-shaped plates; set the gas flow rate and carry out fermentation; the slotted plates and the U-shaped plates form mutually parallel vertical plates, and the bubble size is controlled by adjusting the number of plates, the plate spacing, and the gas flow rate.

9. The method of operating a fermenter including a high-viscosity fermentation adjustable multi-slot plate air distributor according to claim 8, characterized in that, The spacing between the boards can be adjusted from 0.2mm to 2mm.

10. The method of operating a fermenter including a high-viscosity fermentation adjustable multi-slot plate air distributor according to claim 8, characterized in that, The bolts connecting the plates are M6 bolts, with the preload controlled at 18-22 kN, and elastic washers are provided between the bolts and the plate surface.

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