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Book High velocity continuous flow reactor for the production of solar grade silicon

Download or read book High velocity continuous flow reactor for the production of solar grade silicon written by J.C. Schumacher Co and published by . This book was released on 1978 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book High Velocity Continuous flow Reactor for the Production of Solar Grade Silicon First Quarterly Report

Download or read book High Velocity Continuous flow Reactor for the Production of Solar Grade Silicon First Quarterly Report written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This program is designed to test the feasibility of a high volume, high velocity continuous reduction reactor as an economical means of producing solar grade silicon. Bromosilanes and hydrogen are used as the feedstocks for the reactor along with preheated silicon particles which function both as nucleation and deposition sites. Efforts have been devoted to the investigation of system design and system materials of construction. A complete reactor system has been designed and fabricated. Initial preheating studies have shown the stability of tetrabromosilane to being heated as well as the ability to preheat hydrogen to the desired temperature range. Several test runs have been made and some silicon was obtained from runs carried out at temperatures in excess of 1180°K.

Book High Velocity Continuous flow Reactor for the Production of Solar Grade Silicon Second Quarterly Report

Download or read book High Velocity Continuous flow Reactor for the Production of Solar Grade Silicon Second Quarterly Report written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Book High Velocity Continuous flow Reactor for the Production of Solar Grade Silicon Fourth Quarterly Report June 25 September 24 1978

Download or read book High Velocity Continuous flow Reactor for the Production of Solar Grade Silicon Fourth Quarterly Report June 25 September 24 1978 written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The main effort has been concentrated on investigating the pyrolysis of tribromosilane in a fluid bed reactor. Excellent results have been achieved in this area with the yields running in excess of 90% of the theoretical possible for the reaction given below: 4SiHBr/sub 3/ = 2H/sub 2/ + 3SiBr/sub 4/ + Si. An average growth rate of 0.5 microns per minute, based on starting and ending sieve analysis data for the bed, has been noted. This coating on the particles is a very fine nodular coherent coating. Since the reaction cited generates 3 moles of SiBr/sub 4/ for each mole of Si, an investigation was begun to determine if SiBr/sub 4/ could be converted to SiHBr/sub 3/ by reaction with a heated bed of silicon and hydrogen. Preliminary experiments have shown that this is readily feasible. This factor allows the description of closed loop process in which only silicon is consumed and produced. The cycle is given below. Decomposition: SiHBr/sub 3/ = Si + 2H/sub 2/ + 3SiBr/sub 4/. Conversion: 2H/sub 2/ + SiBr/sub 4/ + Si/sub (met)/ = SiHBr/sub 3.

Book High Velocity Continuous flow Reactor for the Production of Solar Grade Silicon Third Quarterly Report March 25 1978 June 24 1978

Download or read book High Velocity Continuous flow Reactor for the Production of Solar Grade Silicon Third Quarterly Report March 25 1978 June 24 1978 written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The status of the program for determining the feasibility of a continuous high volume-high velocity reduction process (gas phase reduction of bromosilanes with hydrogen) for producing low cost solar grade silicon is described. Work has been directed towards maximizing particle growth in the horizontal tubular or cocurrent reactor. These efforts have not been totally successful due to hardware limitations. A new reactor which allows passage of the substrate particles in a countercurrent direction to the gas flow was designed. Particle growth data obtained for particles after one pass in the reactor were not conclusive. Tribromosilane decomposition studies were initiated. Preliminary results indicate that the decomposition proceeds quite smoothly at approximately 975°C and at a hydrogen to tribromosilane ratio of 22. The decomposition reaction appears to attain equilibrium quite rapidly. Silicon deposited under these conditions has a very nodular appearance. HBr has been isolated as one of the reaction products.

Book Monthly Catalog of United States Government Publications

Download or read book Monthly Catalog of United States Government Publications written by United States. Superintendent of Documents and published by . This book was released on 1979 with total page 1250 pages. Available in PDF, EPUB and Kindle. Book excerpt: February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index

Book Solar Energy Update

Download or read book Solar Energy Update written by and published by . This book was released on 1978 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Monthly Catalogue United States Public Documents

Download or read book Monthly Catalogue United States Public Documents written by and published by . This book was released on 1979 with total page 992 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Scientific and Technical Aerospace Reports

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1978 with total page 996 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Book Energy Research Abstracts

Download or read book Energy Research Abstracts written by and published by . This book was released on 1978 with total page 986 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Energy Research Abstracts

Download or read book Energy Research Abstracts written by and published by . This book was released on 1979 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt: