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Apparatus and method for determining solids circulation rate

United States Patent

February 14, 2012
View the Complete Patent at the US Patent & Trademark Office
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The invention relates to a method of determining bed velocity and solids circulation rate in a standpipe experiencing a moving packed bed flow, such as the in the standpipe section of a circulating bed fluidized reactor The method utilizes in-situ measurement of differential pressure over known axial lengths of the standpipe in conjunction with in-situ gas velocity measurement for a novel application of Ergun equations allowing determination of standpipe void fraction and moving packed bed velocity. The method takes advantage of the moving packed bed property of constant void fraction in order to integrate measured parameters into simultaneous solution of Ergun-based equations and conservation of mass equations across multiple sections of the standpipe.
Ludlow; J. Christopher (Morgantown, WV), Spenik; James L. (Morgantown, WV)
The United States of America as represented by the United States Department of Energy (Washington, DC), N/A (
12/ 430,192
April 27, 2009
STATEMENT OF GOVERNMENTAL SUPPORT The United States Government has rights in this invention pursuant to the employer-employee relationship of the Government to the inventors as U.S. Department of Energy employees and site-support contractors at the National Energy Technology Laboratory.