Innovative Silicon Solutions in the Field of Renewable Energy
The continuous technical process of generating «solar» silicon granules and nanosilicon powder is investigated using the plasma pyrolysis of monosilane technique. Decomposition takes 210-5 seconds at 1800oC, for example. Monosilane breakdown occurs at a distance of 2 cm at a plasma velocity of around 1000 m/s. At useful plasmatron power W = 100 kW, volume ratio VAr/VH2 = 0.2/0.8, and reaction zone length L = 0.06 m, the energy consumption is computed as min QSi = 1.69 kWh/kg Si, GSi = 50 kg/h Si, and GSi = 50 kg/h Si. The interaction of monosilane with a plasma jet was used to represent the steady-state cooling and condensation of silicon vapours and molten silicon droplets. it has been considered The impact observed when the condensation reactor is coupled with the granulator, i.e. where the mechanisms of condensation of silicon vapours into a liquid film and conversion of flow of this film into a droplet one occur simultaneously on its working surface, leads to the formation of a new condenser – granulator concept. Turbulent thermal plasma fluxes are used to make nanopowder. With this technology, high-efficiency equipment for continuous manufacture of low-cost silicon for photovoltaics and materials required for future generations of Lithium-ion batteries might be developed with minimal capital and operational costs.
The Gas Institute of the National Academy of Sciences of Ukraine, Kyiv, Ukraine.
The E.O. Paton Electric Welding Institute of the National Academy of Sciences of Ukraine, Kyiv, Ukraine.
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