Purification and recovery technology of argon gas in photovoltaic single crystal furnace
Argon gas has an extremely low content in the air (only 0.93%) and is usually separated and extracted as a byproduct from the air separation oxygen production process. The production cost of high-purity argon gas is relatively high. High purity argon gas (purity>99.999%) is an essential purification and protective gas in the preparation process of single crystal silicon and polycrystalline silicon. The purification and recovery technology of argon gas abroad is expensive, and the production capacity is limited. Therefore, the development of low-cost and high-capacity argon purification and recovery technology with independent intellectual property rights has become an urgent task to be solved.
The team has recently developed highly active and stable catalytic technologies, and has developed a complete set of process technology and equipment based on the industrial demand for argon purification and recovery in Large-scale photovoltaic single crystal furnaces. The prototype machine has recently been successfully driven at Baotou Meike Silicon Energy Co., Ltd. Under milder conditions, various impurities in the argon tail gas of the single crystal furnace are effectively eliminated, and the concentration of various impurities in the purified argon gas is less than 0.5ppm, far superior to the PV6-1110 argon gas industry standard (impurity concentration lt; 10ppm) in the production process of photovoltaic crystalline silicon. This technology can simultaneously meet the argon gas purification requirements of at least 4 to 6 single crystal furnaces under actual working conditions, significantly reducing the consumption of high-purity argon gas in the manufacturing process of crystalline silicon and helping photovoltaic enterprises overcome the impact of argon gas supply fluctuations. The successful start-up of the pilot plant lays the technical foundation for subsequent mass production.
The successful development of this technology will further reduce the cost of solar power generation, bring considerable economic benefits to the solar photovoltaic industry, and effectively enhance the core competitiveness of China's photovoltaic industry.
