Chongqing's polysilicon green efficient production technology achieved a breakthrough

Chongqing Key New Energy Co., Ltd. and Chongqing University jointly sponsored the "Key Technology Research and Application of Hydrogenation of Silicon Tetrachloride in Polycrystalline Production", a key scientific and technological project in Chongqing, and completed the final acceptance check today. Experts concluded that the results have reached the leading domestic level, to solve the technical problems of polysilicon production in China's recycling of by-products, effectively reducing the energy consumption in the polysilicon production process and the three waste emissions.

The effective conversion and utilization of silicon tetrachloride, a by-product of polysilicon production, is directly related to whether the entire production line can be linked to full-load operation, avoid the environmental pressure caused by silicon tetrachloride, and reduce the production cost and sustainable development of polysilicon. Two years ago, domestic polysilicon production failed to effectively recycle the by-product silicon tetrachloride, resulting in high environmental protection costs. As a result, the material consumption of polysilicon production remained high, the production cost could not be controlled, and the market competitiveness of the product was often insufficient. Seriously hindered the development of polysilicon industry. In addition, silicon tetrachloride hydrogenation technology as a key technology to improve the Siemens polysilicon production process, has been dominated by a small number of Western developed countries and monopoly, and the implementation of foreign technology blockade.

During the implementation of the project, Chongqing Daxin Brand New Energy Co., Ltd. uses an annual output of 3,300 tons of polysilicon production equipment as a platform to convert silicon tetrachloride into silicon tetrachloride through the development of large-scale silicon tetrachloride thermal hydrogenation equipment, off-site rectification, and tail gas recovery technologies. The conversion rate for silicon trichloride has been increased from the existing 17% to 24%. Through recycling many times, all the silicon tetrachloride as a by-product can be recycled.

After two years of hard work, the project team has broken through the key technologies for the industrialization of the production of trichlorosilane by silicon tetrachloride based on a single hydrogenation reactor with a capacity of 4 tons/hour, forming hydrogenation reactors, process instruments and power supplies, etc. The system integrated technical package has built an industrialized device for preparing trichlorosilane from silicon tetrachloride as a by-product of polysilicon. Through the transformation of the production line, Daquan saves more than 30 million kilowatt hours of electricity annually, saves more than 20 million yuan in electricity bills, recycles more than 10,000 tons of by-products, and saves more than 7,000 yuan in funds. Experts believe that the application of this result will enhance the core competitiveness of China's polysilicon manufacturing companies, and provide new ways to improve the quality of polysilicon products in China, reduce environmental pollution in the polysilicon production process, and solve the vicious competition caused by excess polysilicon production capacity.

Wear-resistant Ball Valve

Wear-Resistant Ball Valve,Wear Resistant Ball Valve,High Hardness Wear-Resistant Ball Valve,Ball Valve With Pressure Relief

Chongqing Xingjida Import and Export Trade Co., Ltd. , https://www.xjdvalve.com