In recent years, with the rapid development of information technology and solar energy industry, the global demand for polycrystalline silicon has grown rapidly, and the market is in short supply.
During the production process of polycrystalline silicon, there are problems with the transportation of silicon powder. The pneumatic transportation of silicon powder generates a series of wear and erosion problems that affect normal production operations.
The pneumatic conveying of silicon powder is characterized by fast medium flow rate, high hardness of silicon powder, and valve wear during pipeline transportation. Currently, without significant improvement and optimization of the production process, the appropriate valve method is selected.
According to the characteristics of pneumatic conveying of silicon powder, the polycrystalline silicon special valve adopts the currently reasonable three piece floating ball structure, with the ball core and valve seat all made of engineering structural ceramic materials. A ceramic lining is added to the valve body and flange, making the entire channel of the valve and the parts in contact with the medium all ceramic materials. All parts in contact with the medium are structural ceramic materials, with chemical stability and hardness second only to diamond, taking advantage of the inherent advantages of ceramics, Achieve the goal of wear resistance and erosion resistance. Therefore, polycrystalline silicon specialized valves have wear resistance, corrosion resistance, erosion resistance, good insulation, and low thermal expansion.
