Polysilicon production process status and development trend
At present, the main international polysilicon production process is to improve the Siemens process, which accounts for more than 85% of the total production capacity. In 2010, polysilicon produced using this technology accounted for 86.6% of the world's total output of 167,000 tons. The technology matured in the 1970s. After nearly 20 years of silence, along with the development of the photovoltaic industry, all countries in the world carried out secondary innovations on this technology. For example, Silicon Hightech broke through the large-scale low-temperature hydrogenation technology, large-scale energy-saving reduction furnace technology, High-efficiency pressurization distillation purification technology, high-pressure trichlorosilane synthesis technology, tail gas dry recovery technology, silicon tetrachloride production of gas-phase white carbon black technology and comprehensive utilization of thermal energy. With large-scale production, this technology still has room for improvement.
In recent years, with the expansion of its output, the improved Siemens technology has strengthened its competitiveness, and its mainstream craftsmanship has become more stable. It will remain the mainstream technology in the next 20 years or more. The improved Siemens process can meet the requirements of large-scale, safe and environmentally-friendly production because of its high purity and low production cost, and it has become the market's preferred mainstream process. From the cost point of view, the costs of WACKER and REC have been basically close, showing that the technology has a strong vitality. Here are some of the major polysilicon production methods.
1 Improved Siemens Process—Closed-loop trichlorosilane hydrogen reduction method The modified Siemens process uses chlorine and hydrogen to synthesize hydrogen chloride (or purchased hydrogen chloride), hydrogen chloride and industrial silicon powder to synthesize trichlorosilane at a certain temperature, and then The trichlorosilane is separated and purified by distillation, and the purified trichlorosilane is subjected to a CVD reaction in a hydrogen reduction furnace to produce high-purity polysilicon.
Most existing polysilicon plants at home and abroad use this method to produce electronic grade and solar grade polysilicon.
2 Silane Method - Silane thermal decomposition method Silane (SiH4) is prepared by hydrogenation of silicon tetrachloride, decomposition of silicon alloy, hydride reduction, and direct hydrogenation of silicon. The purified silane gas is then purified to produce rod-shaped polysilicon having a higher purity in a pyrolysis furnace. In the past, only Komatsu Japan had mastered the technology and did not continue to expand production after a serious explosion. However, American Asimi and SGS companies still use silane gas thermal decomposition to produce electronic grade polysilicon products with higher purity.
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Key Features
1.The lifespan is over 50000 hours,low maintenance costs.
2.Energy conservation,saving over 80% energy than the traditional HPS.
3.High light efficiency,90% of the light will be absorbed by the aquatic plants,while just 8%-10% to the HPS.
4.Build-in cooling system,could solve the heat dissipation excellently.
5.Built-in power supply, CE approved, No setup required, just simpler and safer plugs directly into AC85V-264V, no reflector & ballast needed.
Convenient in using lights at the same time.
Package Include
1 X Free Hanging Kit
1X Free Power Cord
Quality Control systems and after-sales
All the lamps have passed strict quality examination and are packed carefully before shipping. In order that our customers get high quality lamps, we attach importance to every details.
Application
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Our Company
Philizon Advantages
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Trade Terms
Payment: T/T, L/C, Paypal, 30% deposits before production, 70% balance to be paid before deliverying(Western Union are welcome)
Sample will be delivered within 7 working days.
Discounts are offered based on order quanlityes.
MOQ:sample order are acceptable
Delivery ways:DHL,UPS,FedEx,TNT, door to door,by sea,by air,etc.
Our products ranges:
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