Westinghouse Coal-Gasification Combined-Cycle Preliminary Plant Evaluation for Electric-Utility Applications. Final Report, September 30, 1979-June 30, 1981

摘要

A Westinghouse coal gasification, combined-cycle preliminary plant evaluation design study for electric utility application is presented. Process descriptions, cost estimates and flow diagrams are based on a plant configuration incorporating an air-blown, fluidized-bed, gasification system, a combustion turbine system, and a reheat steam turbine system for the bottoming cycle. Data obtained from the program developed under Department of Energy Contract EF-77-C-01-1514 provide the basis for the design of the gasification systems. The study utilizes the Middletown U.S.A. site described in Appendix A as the plant location, since it contains characteristics generally available at various sites throughout the country. Scoping evaluations indicate that a plant capacity of approximately 650 megawatts electric net represents an appropriate plant size from an efficiency, as well as from a utility, point of view. Various cases are analyzed to determine the effect of plant configuration and equipment on the overall plant heat rate and annual busbar costs. A heat rate of 8340 Btu per kilowatt-hour is projected for a plant case that (a) fully integrates the power cycle with the entire gasification process and (b) assumes that 1000 exp 0 F superheated steam is generated in the gasifier raw gas heat exchanger area. The other cases, reflecting less integration and lower superheated steam conditions, are also presented. Heat rates and economics of conventional coal-fired steam plants with stack gas scrubbers are provided for comparison. The Westinghouse air-blown coal gasification combined cycle system for electric utility application is projected to have efficiency and economic advantages over a conventional coal-fired steam plant with stack gas scrubbers. (ERA citation 07:003943)