Four factors affect the quality of coal gas in the type of total gasification plant used for generation of electricity. The coal gas properties investigated here are considered in relation to the effects of these four factors: (a) coal type, (b) fluidized-bed type of gasifier, (c) wet (cold) and dry (hot) gas cleanup systems, and (d) gas turbine requirements.
The properties given are for gases having a heating value range of 3.4 to 11.3 MJ/m3 (90 to 300 Btu/ft3) and include gases from both air-blown and oxygen-blown gasifiers.
The chemical makeup of the gases is considered in terms of the nitrogen gas, hydrogen gas, carbon dioxide, carbon monoxide, and water content. Also the trace material content is given in both quantity and size of particles. The amounts of sodium and vanadium and both the size and the concentration of potentially erosive particles are discussed.
The measurement methods required for these types of fuels are also briefly discussed.
This paper describes the conceptual design of an advanced technology coal gasification combined cycle power plant which has significant advantages over other power generation technologies. The plant is expected to provide lower capital and operating costs and superior environmental acceptability than other modes of generation.
The design is based on the KRW Energy Systems Inc.’s pressurized fluidized bed coal gasification system. Hot cleaning of the fuel gas is accomplished using concepts being developed at the Waltz Mill pilot plant. Desulfurization of the fuel gas is by injection of dolomite into the gasifier bed. Final particulate removal is accomplished by an external filter. Net power output from the plant is 73 MW and the overall plant heat rate is 8760 Btu/KWh (HHV).
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