Fluidized Bed Gasifier with Hot Gas Cleanup-KRW Process
Publication Date: 2012-Jun-07
The IP.com Prior Art Database
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PLUIDIZID BED COALGASIFICATIONWITH HOT GAS CLEANUP
1. CONTRACT NUMBER: CONTRACTOR:
KFtW Energy Systems Inc. P.O. Box 334, Waltz Hill Madison, PA 15663-0334 (412)722-6033
Dale K. Schmidt
PRINCIPAL INVESTIGATORS: Gaurang B. Haldipur
Kevin J. Smith Subhash Datta Peter Cherish
METC PROJECTMANAGER: Justin L. Beeson
PERIOD OF PERFORMANCE: August 1,1984 through September 30,1988
2 . SCHEDULEIMILESTONES:
SLOPED DIPLEG -CERAMIC FILTER II -HOT PIPINGMODS
PDU TESTS DATA ANALYSIS
The overall goal of the program is to provide an engineering design data base f o r an IntegratedGasification Combined Cycle (IGCC)
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technology,which is comprised of a pressurized fluid-bed gasifierwith in-beddesulfurization, an external polishing desulfurizer using a regenerablemetal oxide sorbent, and appropriate particulate cleanup trains for turbine protection and control of environmental emissions.
Specific objectives of the technology development program are to:
(1)characterize the operational performance of a 15 tpd pilot-scale gasifierwith in-bed desulfurization, ( 2 ) demonstrate hot gas particulate cleanupusing cyclones and barrier filters,and ( 3 ) develop pilot-scale operability data on a fixed-bed externaldesulfurizer using a zinc ferrite sorbent.
4. BACKGROUND STATEMENT:
The M. W. Kellogg Company has developed an advanced IGCC system that employs a fluidized bed air-blown gasifier and an advancedhot gas cleanup train for control of pollutants and turbine blade corrodents (Cover 1987). Specific advantages of this system are: (a) it can be deployed in competitively priced standard modules of 50-100Kw, (b) it achieveshigher cycle efficiencies than coal-fired steam boilers and first generation IGCC plants with cold gas cleanup, (c) it exceeds the New Source Performance Standards (NSPS) for S02, NO, and particulate emissions, (d) it complieswith Resource Conservation & Recovery Act (RCRA) criteria for solidwaste disposal, and (e) it can be used with a wide variety of coalswhile assuring the same high degree of cleanup across the feedstock slate.
The development of the gasification process and the associated hot
gas cleanup systems has been conduc_tehat_a 1 5 5
Unit (PDU) operated by KRW Energy Systems,a subsidiary of the M. W. Kellogg Company and partly owned by Westinghouse Electric Corporation. The currentphase of the testing program represents the culmination of a 14-yeardevelopment effort during which 13,300hours of hot gasifier operationwere accumulated.
The KRW air-blown gasification process operates at 16000-19000F, a temperature range high enough to avoid formation of tars and oils and low enough to avoid material problems. In addition, effective in-bed desulfurization is favored in this temperature range wherein a nominal desulfurization of 85-95 percent is accomplished simply by feeding limestoneor dolomite to the gasifier with the coal...