Evaluation of intermediate-Btu coal gasification systems for retrofitting power plants. Final report
Process and economic evaluations have been made of two different intermediate-Btu coal gasification systems retrofitted to an existing electric power unit. One of the systems uses fixed-bed, oxygen-blown Lurgi gasifiers for sized coal (coal fines are sold as a byproduct) with a tar and oil cleanup, hydrogen sulfide removal and sulfur recovery processes. The other system uses entrained-bed Koppers-Totzek gasifiers, which gasify the coal including fines, with a hydrogen sulfide removal and sulfur recovery process. Using a prescribed set of representative power unit, process design and economic premises, a base case (500 MW, 3.5% S in coal, existing unit) incorporating the latest available technology was defined for each system, including a complete material balance, equipment list, and construction and operating requirements. Capital investment, annual revenue requirements (7,000 hr/yr) and lifetime revenue requirements (over a 25-yr declining operating profile) were estimated for the base case of each system. A 3-yr construction schedule ending in mid-1976 was assumed for a midwestern location. Investment costs (mid-1975 dollars) can be scaled or altered to reflect any predictable project schedule, escalation rate, or location. The investment and revenue requirements for these intermediate-Btu gasification systems are compared with the investment and revenue requirements for six fixed-bed, low-Btu gasification systems which were evaluated in a previous study.
- Research Organization:
- Tennessee Valley Authority, Muscle Shoals, Ala. (USA)
- OSTI ID:
- 7086163
- Report Number(s):
- EPRI-AF-531
- Country of Publication:
- United States
- Language:
- English
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