How to perform high-intensity work on filter thickener

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 The process adopted by the coal industry in my country is mainly based on wet coal preparation, and a large amount of slime water will be produced in the process of coal processing. Therefore, the treatment of slime water is a key link in the production of a coal preparation plant. The operation of the slime water system is related to whether the coal preparation plant can be normally produced. At the same time, it also involves the water of the coal preparation plant and the recovery of coal resources. Protect many aspects of the ecological environment. The thickening and clarification of slime water is an important link in the treatment of slime water. Under the current situation, we can use the rake thickener based on the principle of gravity sedimentation as the main equipment to apply, and then use the principle of gravity sedimentation to concentrate the slime water The equipment efficiency drops greatly, which will cause the overflow water concentration to exceed the standard, which will have a serious impact on the washing equipment. Therefore, further development of the new type of concentration equipment is very necessary.

The filter thickener is a new type of thickening equipment. Its working principle is different from the current thickening equipment in coal preparation plants. When the equipment is running, the filter slurry will be continuously pumped through the feed pipe by the internal filter and The filter room enclosed by an external static body. And to maintain a full state, use the pressure difference between both sides of the rotor to achieve filtration and concentration. The flow state of the slurry in the filter chamber is related to the speed of the rotor. When the speed of the rotor reaches a certain limit value, A kind of annular vortex called Taylor vortex will be generated. Adjacent Taylor vortices will be connected at a certain axial flow rate to prevent the axial reverse flow or short circuit of the liquid flow. Therefore, the liquid flow between the outer cylinders It is an ideal columnar flow. The slurry in the filter chamber undergoes a top-down rotational movement under the combined action of the resistance of the outer wall, gravity and centrifugal force. When flowing through the area, the pressure difference between the two sides of the filter medium will be used for the outer wall of the rotor. A filter cake is formed. When the filter rotor rotates, the filter cake on the medium will be subjected to the action of shearing and sweeping, thereby achieving filtration and concentration under the thin cake layer. Finally, the filtrate will pass through the filter medium and be discharged from the discharge port inside the drum to complete the filtering and concentration effect.

However, through the simulation of the filter thickener, it is found that the change of the internal flow field is related to the concentration of the feed, the speed of the drum, the pressure of the feed, and the opening of the concentrate outlet valve. Therefore, according to the simulation results, It is used to analyze the influence of the four factors of the concentration of the feed, the rotating speed of the drum, the pressure of the feed, and the opening of the concentration outlet valve on the concentration effect. The range analysis of the experimental results shows that: (1) The higher the feed pressure, the lower the concentration of the concentrate. This is because as the feed pressure increases, the driving force of the filtration process increases, and Wyeth is many small The particles penetrate the essence into the clarified liquid; (2) The smaller the opening of the concentrated liquid outlet valve, the greater the concentration of the concentrate. This is because the reduction of the valve opening makes the filtration time longer and the filtration pressure increases. Increase the filtration capacity of the clean water; (3) The feed concentration increases, and the concentrate concentration increases. This is because the thickness of the filter cake and the filtration resistance increase with the increase in the feed concentration, so that the ability to trap fine particles changes Strong; (4) If the rotating drum speed is too fast, the concentration of the clarified liquid will increase. This is because the rotating drum speed is too fast and the centrifugal force field will increase the filtration resistance.

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