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Method and apparatus to reduce contamination of particles in a fluidized bed reactor

A fluidized bed reactor and reactor technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve problems such as material pollution

Inactive Publication Date: 2014-07-23
SHAANXI NON FERROUS TIAN HONG REC SILICON MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] A common problem in fluidized bed reactors is the contamination of silicon-coated particles in the fluidized bed by materials used to construct the reactor and its components at high operating temperatures

Method used

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  • Method and apparatus to reduce contamination of particles in a fluidized bed reactor
  • Method and apparatus to reduce contamination of particles in a fluidized bed reactor
  • Method and apparatus to reduce contamination of particles in a fluidized bed reactor

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Embodiment

[0041] By plasma transfer the A 12 alloy protective layer is applied to the top probe assembly consisting of a 304H stainless steel base. The protective layer has an average thickness of 0.020" (0.5mm). Probes made of 304H will wear through within approximately 90 days of use in fluidized bed reactors used to manufacture silicon-coated pellets. Reactor materials contain no cobalt except for the protective layer .

[0042]The coated components were placed in a fluidized bed reactor and operated for approximately 50 days between two test runs. No wear was seen on the probe or the protective coating. Analysis of the granular silicon product revealed a steady state cobalt level of about 1.5 ppbw (1.5 parts per billion by weight) during the first test run. During the second run, cobalt levels dropped to about 0.5 ppbw. Cobalt analysis prior to use of the probe showed approximately 0.3 ppbw. Corrosion of bare 304H probes is estimated to contribute over 25 ppbw of total metal t...

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Abstract

A method and fluidized bed reactor for reducing or eliminating contamination of silicon-coated particles are disclosed. The metal surface of one or more fluidized bed reactor components is at least partially coated with a hard protective layer comprising a material having an ultimate tensile strength of at least 700 MPa at 650 DEG C.

Description

[0001] Cross References to Related Applications [0002] This application is a continuation-in-part of U.S. Application No. 13 / 670,200, filed November 6, 2012, and a continuation-in-part of U.S. Application No. 13 / 939,067, filed July 10, 2013, both of which are incorporated by reference It is incorporated herein in its entirety. technical field [0003] The present disclosure relates to hard protective layers for fluidized bed reactors, particularly fluidized bed reactors for the cracking of silicon-containing gases to produce silicon-coated particles. Background technique [0004] Cracking of silicon-containing gases in a fluidized bed is an attractive process for the manufacture of polysilicon for the photovoltaic and semiconductor industries due to excellent mass and heat transfer, increased deposition surface, and continuous production. Fluidized bed reactors offer greatly increased production rates at a fraction of the energy consumption compared to Siemens type reacto...

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Application Information

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IPC IPC(8): B01J19/02C30B28/14C01B33/035
CPCB01J8/1809B01J19/02B01J2219/00245B01J2219/0236C01B33/027C23C16/24C23C16/4404C23C16/442
Inventor 马修·J·米勒迈克尔·V·斯潘格勒
Owner SHAANXI NON FERROUS TIAN HONG REC SILICON MATERIAL CO LTD