Title: Gasification-combined-cycle plant: part-load performance. Final report
Abstract: This report presents the results of studies that estimated the performance of Texaco-based Gasification-Combined-Cycle (GCC) plants at off-design conditions. Plant configurations designed with either two or three gas turbines were studied for the purpose of estimating their part-load performance. Additionally, performance at off-design ambient temperatures was estimated for the two gas turbine-based plant. These estimates used vendor data where appropriate. The results are presented as curves relating net power output to net heat rate for each plant. Off-design ambient performance is presented as plots of net power output and net heat rate versus ambient temperature. GCC plants can be operated in different modes by taking trains of equipment off-line as plant power output is reduced. Minimum load with all equipment on-line is approximately 20 to 35% of the design power output. This minimum load point may be reduced to 15 to 25% of design power output with only a single gas turbine on-line. The relationship of heat rate to power output for the GCC plant designs studied shows small heat rate increases as power output is reduced near the design point and increasingly larger heat rate increases for further output reductions. At 40% of design power output with all equipmentmore » on-line, the two gas turbine-based plant showed a heat rate that was 155% of the design value. This same power output could be obtained at a heat rate only 105% of the design value by taking one of the gas turbines off-line, permitting the remaining gas turbine to be operated much nearer its design power output. 1 ref., 34 figs., 3 tabs.« less
Publication Year: 1986
Publication Date: 1986-07-01
Language: en
Type: article
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