Nitrification tank frame mixer

Nitrification tank frame mixer

Overview

Frame mixerIt can be regarded as a deformation of the paddle mixer, which has a relatively sturdy structure and a large amount of animal material to be stirred. The gap between the frame mixer and the kettle wall is small, which is conducive to the heat transfer process. It is commonly used for heat transfer, crystallization operations, and stirring of high viscosity liquids, high concentration slurries, and settling slurries.

Nitrification tank frame mixer
Working principle and structural characteristics

The diameter of the frame stirrer is relatively large, usually taking 2/3-9/10 of the inner diameter of the reactor, and 50-70r/min. The gap between the frame stirrer and the reactor wall is small, which is conducive to the heat transfer process. When rotating rapidly, the liquid driven by the stirrer blades brings the stationary layer down from the reactor wall; When rotating slowly, a stirrer with a scraper can generate good heat conduction.
The connection method between the frame mixer and the mixing shaft is similar to that of a paddle type, that is, one end of the impeller connected to the mixing shaft is made into a semi-circular collar, and then the two semi-circular rings of the two sides of the blades are clamped on the mixing shaft with bolts, while the blades and the mixing shaft are fixed with through shaft bolts. Due to the large external dimensions of the impeller, most of the blades are connected by bolts for ease of assembly and disassembly. The impeller is mostly made of flat steel and angle steel. In order to improve the strength of the impeller, reinforced steel plates can also be used.




The mixing shaft is connected to the crossbars and vertical bars through assembly or welding. When the mixing shaft is driven to rotate by a reduction motor, the animal material flows horizontally in a circular direction at different heights. The crossbars and vertical bars effectively divide the material, achieving the process effect of forced mixing and dispersion.

Stainless steel double-layerFrame mixermanufacturer
Application field

The frame agitator is generally used for mixing Congee like materials. The appropriate mixing speed is 60-130 r/min, and the applicable viscosity is 200~300 Pa · s.

Application field

Frame mixerIt usually operates at low speeds and does not generate large shear forces when stirring low viscosity liquids, so it is not suitable for liquid-liquid and gas-liquid dispersion. On the other hand, this type of impeller moves at a high flow rate inside the tank, with horizontal swirling flow dominating and lacking good mixing uniformity. However, the flow velocity near the tank wall can achieve a higher heat transfer film coefficient than other impellers, making it commonly used for heat transfer and crystallization operations. In addition, due to the large diameter of the blade and its proximity to the bottom of the tank, it is also commonly used to stir high concentration slurries and precipitating slurries. It is also commonly used for stirring high viscosity fluids.