Screening evaluation of novel power cycles integrated with gasification plants. Final report

Technical Report · Thu Feb 01 04:00:00 EST 1979

DOI:https://doi.org/10.2172/6273227· OSTI ID:6273227

Foster-Pegg, R. W.; Garland, R. V.

This report presents the results of a screening study on power cycles integrated with a coal gasification plant. Three basic plant configurations are studied: (1) the Condensing Combined Cycle, the most common combined cycle, which includes combustion turbines, gas expanders and condensing steam turbines. This configuration should be considered as the base case; (2) the Single Cycle, which is comprised of combustion turbines and gas expanders, but no steam turbines; (3) the Non-Condensing Combined Cycle, which utilizes combustion turbines, gas expanders and a non-condensing steam turbine. The gasifier used throughout is the Texaco entrained, coal slurry-fed, air blown gasification system along with a scrubber, sulfur removal system and a tail gas treater. The combustion turbines are advanced types. Nominal turbine inlet temperature in all cases is 2400/sup 0/F but pressure ratios vary depending upon the particular example. The turbine cooling method is thermal barrier, and both air and steam cooling is applied. Performance and water requirements are compared among the various cycles. The results show that efficient power plants integrated with a coal gasification system are possible and do not necessarily require the condensing steam turbine that is characteristic of combined cycle systems. The most efficient plant configuration studied included a non-condensing steam turbine. The best plant heat rate calculated for this configuration is 7956 Btu/Kwh which compares very favorably to the 8287 Btu/Kwh calculated for the condensing combined cycle. The best system that did not include steam turbines yielded a heat rate of 8039 Btu/Kwh.

• Research Organization: Westinghouse Electric Corp., Eddystone, PA (USA)
• OSTI ID: 6273227
• Report Number(s): EPRI-AF-1002
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
200102* -- Fossil-Fueled Power Plants-- Power Cycles
COAL GASIFICATION
COMBINED-CYCLE POWER PLANTS
COMPARATIVE EVALUATIONS
COOLING
EFFICIENCY
GAS TURBINES
GASIFICATION
HEAT EXCHANGERS
POWER PLANTS
STEAM TURBINES
TEXACO GASIFICATION PROCESS
THERMAL EFFICIENCY
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES
THERMODYNAMIC CYCLES
TURBINES
TURBOMACHINERY
WATER REQUIREMENTS