Entrained gasification combined-cycle control study. Volume 1. Summary of results and conclusions
In this study, two control strategies were evaluated for an entrained coal gasifier fueling a gas turbine/steam turbine combined-cycle power plant forming an integrated plant which was simulated by computer to analyze alternative control strategies. Transient operation of this gasification-combined-cycle (GCC) plant was studied to determine open-loop response as a stand-alone plant, as well as closed-loop response while functioning in a typical utility power system. GCC plant performance during specified operating contingencies such as equipment trip or emergency shutdown, was also studied. Conclusions may be summarized as follows: The GCC plant may be controlled satisfactorily in either gasifier-lead or turbine-lead control mode. The absorber column consistently removed 90% of the hydrogen sulfide (H/sub 2/S) in the raw fuel gas produced from high sulfur Illinois coal during the closed loop control runs. GCC plant pressure control must be installed to minimize plant pressure transients of the absorber column in the Acid Gas Removal Unit. The local controllers adequately maintained the GCC plant operation during all the emergency upsets examined. The GCC plant responds well to typical variations in electric power demand, i.e., gradual changes for daily load following and successive rapid changes for the tie-line thermal backup and frequency regulation. Supplemental fuel gas storage is not required. The design and operating characteristics of the oxygen plant can affect the response time of the GCC plant. A separate study of oxygen plant design alternatives is recommended to evaluate potential improvements in transient response rate and turndown capability, since the specific tradeoffs between process economics and more flexible dynamic operation are not clear. Ultimately, the effects of the oxygen plant response upon fuel gas composition during typical GCC plant load changes should be examined.
- Research Organization:
- Fluor Engineers and Constructors, Inc., Irvine, CA (USA); Westinghouse Electric Corp., Concordville, PA (USA)
- OSTI ID:
- 5147487
- Report Number(s):
- EPRI-AP-1422(Vol.1)
- Country of Publication:
- United States
- Language:
- English
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