Fermentation tank is suitable for pharmaceutical, biological, beverage, food, chemical and other industries. It is a device specially used for microbial fermentation in bioengineering related industries. Its appearance has brought a lot of help to our lives. The structure and design of the whole machine have been specially designed, so there is no need to worry about cleaning and maintenance in use. It is very simple and can be used widely. The need to understand the tank will increase. Today we will briefly introduce the types of stirring paddles in the fermentation tank.
Generally, the top layer of the paddle of the fermentation tank is a defoaming paddle to remove foam; the middle is generally a four-blade propeller agitator, which is generally 2~4 layers according to the height of the tank; the most widely used at the bottom is asymmetric parabolic disc turbine. Agitators and other disc turbine agitators. Further down there is a gas distributor. So what are the specific types of stirring paddles in the fermentation tank? The following is a detailed introduction from Bioreactek Company as follows:
| SN. | Paddle form | Picture | Main description |
| 1 | Paddle | 
| The basic structure of a paddle agitator is generally composed of four parts: paddle, key, collar and vertical shaft. Commonly used blades are generally made of ordinary flat steel or angle steel. When the medium being stirred is corrosive to steel, the material used is stainless steel. |
| 2 | Backward curved blade disc turboprop | 
| Compared with the open turbine agitator, this type of agitator has the same basic flow pattern, and also has high shear capacity and greater circulation capacity. It is suitable for use in the process of gas dispersion and absorption; the curved blade has a rear angle, good discharge performance and low power consumption. |
| 3 | Half-Tube Disc Turboprop | 
| Radial flow agitators, their blades are concave arc type, have strong radial displacement and dispersing ability, under the same power, their mass transfer coefficient is more than 20% higher than that of flat-blade disc turbine, and the gas holding capacity is It can be increased by more than 30%, and the power consumption is relatively low, so it is especially suitable for dissolved oxygen operation reactions similar to fermentation processes, and also suitable for other operations such as gas dispersion, absorption and mixing, mass transfer and heat transfer. |
| 4 | Parabolic Disc Turboprop | 
| Radial flow agitators, whose blades are paraboloids, have extremely strong radial displacement and dispersing ability. Under the same power, their mass transfer coefficient is more than 30% higher than that of flat-blade disc turbine, and the gas holding capacity is increased by more than 40%. , and the power consumption ratio is very low, so it is especially suitable for dissolved oxygen operations similar to fermentation processes, and also suitable for gas dispersion, absorption, mass transfer and heat transfer operations under other requirements. |
| 5 | Turboprop | 
| This type of agitator is developed and developed by drawing on foreign advanced similar products. Compared with the curved-blade disc turbine agitator, the basic flow pattern is the same, and it also has high shear capacity and larger circulation capacity. Only the disc is closed, a large amount of gas can be stored below, and the gas and liquid can be dispersed more stably downward, and at the same time, a higher rotation speed is not required, so it is more suitable in the process of gas dispersion and absorption. The paddle can be made into a detachable paddle for easy installation and maintenance. |
| 6 | Propeller paddle | 
| The three-blade propulsion type is the most typical axial flow type agitator, with high liquid discharge and low shear performance: if the baffle or the guide tube is used, the axial circulation is stronger, and the discharge performance is significantly improved, because it has strong circulation capacity and high power. Low consumption can best reflect its advantages in large-capacity homogeneous and mixing processes, and is widely used in low-viscosity liquid heat transfer, reaction, suspension and dissolution with a small solid-liquid ratio. |
| 7 | Anchor paddle | 
| This type of agitator is a slow-speed agitator, suitable for mixing, heat transfer or reaction of medium and high viscosity liquids. The rotating surface of the bottom of the paddle is close to the elliptical surface of the container, and it also acts as a scraper. Most of them run at low speed and often operate in laminar flow. Creates a horizontal annular flow, such as a hinged or angle-steel blade, which increases eddy currents near the blade. |
| 8 | Anchor frame paddle | 
| This type of agitator is a slow-speed agitator, suitable for mixing, heat transfer or reaction of medium and high viscosity liquids. Often operates in a laminar flow state. Creates a horizontal annular flow, such as a hinged or angle-steel blade, which increases eddy currents near the blade. Vertical blades and beams can be added to the paddle as required to increase the stirring range. |
| 9 | Screw propeller | 
| This type of agitator is a slow-speed agitator, which is often operated in the laminar flow area. The liquid rises or falls along the helical surface to form an axial up and down circulation. It is suitable for mixing and heat transfer of medium and high viscosity liquids. The outer profile of the ribbon of the ribbon stirrer is close to the inner wall of the stirring tank, and the stirring diameter is large, which strengthens the up and down circulation of the liquid near the tank wall, and is very suitable for the heat transfer process of high viscosity liquids. Ribbon-screw combination type has the characteristics of screw and ribbon at the same time, which strengthens the circulation of the liquid inside and outside, and is especially effective for non-Newtonian plastic and viscoelastic liquids. It can be designed according to the shape of the bottom of the kettle. |
| 10 | Brumakin paddle |  | A six-blade open turbine type agitator. Radial flow pattern, the front end of the blade is widened and has a backward curved angle, which not only improves the discharge performance, but also reduces the shear strength, less power consumption, and the discharge performance is better than the straight blade or curved blade to open the turbine. When there is a baffle, it can form an upper and lower circulating flow, which is more suitable for mixing, dispersion, solid-liquid suspension, dissolution and other processes. |
| 11 | Three-blade swept paddle | 
| The radial flow agitator, combined with the finger-shaped baffle, can obtain a large flow of upper and lower circulating flow, and has a good shearing effect, which is suitable for heat transfer, mass transfer, solid dissolution, solid-liquid suspension, polymerization, etc. |