Open AccessHigh velocity continuous-flow reactor for the production of solar grade silicon. First quarterly report
Author(s) -
L. Woerner
Publication year - 1977
Language(s) - English
Resource type - Reports
DOI - 10.2172/5064333
Subject(s) - silicon , materials science , nuclear engineering , hydrogen , range (aeronautics) , nucleation , hydrogen production , solar furnace , reactor design , process engineering , chemical engineering , thermodynamics , chemistry , solar energy , metallurgy , engineering , composite material , electrical engineering , physics , organic chemistry
The objective is to determine the feasibility of a high volume-high velocity continuous reduction reactor as an economical means for producing solar grade polycrystalline silicon. Preheated streams of hydrogen and bromosilanes are used as feed to the reduction reactor. Nucleation and deposition sites are provided by the additional feed of preheated silicon particles to the reactor. The effort has been directed at studying the chemistry taking place in the reactor, determining the factors which influence its course, and making necessary reactor modifications as dictated by observed results. The initial reactor design has been extensively changed. Energy losses due to gas expansion in the nozzle/mixer section of the reactor dictated these design changes. A ''Tee'' configuration, in which the two preheated gas streams are merged at right angles without any expansion, has replaced the nozzle/mixer. Results of the hydrogen reduction of tetrabromosilane with and without the use of silicon deposition substrate particles are analyzed.
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