Economic studies of coal gasification: combined cycle systems for electric power generation. Final report

Electric energy supply systems: description of available technologies

“…A heat rate of 7188 Btu/kWh was estimated from the Fluor report based on pressurized gas fuel and a turbine firing temperature (Chandra et al 1978b). This is comparable with estimates for liquid-fueled combined cycles of 8345 Btu/kWh for 2000°F firing temperature, 7300 Btu/kWh for 2200°F firing temperature and 6679 Btu/kWh for 3000°F firing temperature (EPRI 1979;NRC 1977b).…”

“…By integrating a GCC system with a coal gasification plant, cost savings can be made and overall thermal efficiency can be improved compared to separate gasification and power plants. Several studies have been published on these systems; th~ general conclusions reached in these studies are that integrated gasification combined-cycle systems (IGCC) can potentially produce electric power at lower cost and higher thermal efficiency than conventional coal-fired systems with stack gas scrubbers (Chandra et al 1978b;Jones and Donahue 1977;Robson, Belcher and Colton 1976). The IGCC systems are also expected to have lower air emissions and water requirements.…”

“…Among the various design studies that have been published, those published by Fluor Engineers. and Constructors under EPRI sponsorship appear to be the most up-to-date (Chandra 1978a(Chandra , 1978bColeman et ale 1979)~ The results of the Fluor-EPRI studies are also well suited for use in this study because important assumptions are clearly spelled out and process designs and cost breakdowns are given in sufficient detail to allow comparison among this study and others.…”

“…The Fluor reports cited previously give separate cost estimates for gasification plants producing either intermediate Btu gas or electric power using the BGC slagging gasifier (Chandra et ale 1978a(Chandra et ale , 1978b. Adding the combinedcycle power production equipment increased the plant capital cost by an amount equivalent to $259/kW (mid-1976 dollars not including contingency).…”

“…If the more conservative contingency (20%) is used, the capital cost, including contingency, is 4.32 $485/kW (1981 dollars). Estimated construction times range from 24 to 36 months (Bechtel 1977;EPRI 1979;Chandra et al 1978b). The total capital required includes capital cost ($485/kW); land, inventory and startup costs (~$24/kW); escalation during construction (EDC); and interest during construction (IDC).…”