| 초록 |
Clean Coal Power(CCP)'s Nakoso IGCC demonstration plant was constructed in 2007, and has been operated with the air-blown entrained-bed coal gasifier. The plant consumes ca. 1,700 ton-coal/day to produce 250 MW-gross electricity. Syngas is treated by wet MDEA+gypsum recovery process. Employed gas turbine was 1,200C C-class 50 Hz turbine. Reliability was confirmed by 2,039 hours of continuous operation, and the resulting net thermal efficiency was 42.9% (LHV basis). Carbon conversion reached ＞99.9% and the environmental performance was SOx 1.0 ppm, NOx 3.4 ppm, and the dust ＜0.1 mg/Nm3. Startup time of 15 hr was sufficient to operate, and the minimum load was able to reduce to 36%. Slag hole blockage has never happened during operating test. The flow of molten slag was constant, which means that the gasifier is operating in a very stable condition. Load change rate of 3%/min which is compatible with conventional PCF in Japan, was realized by adjusting the operation parameters. Because of nitrogen-containing coal gas, air-blown IGCC is not exactly suitable for chemical production or poly-generation compared with oxygen-blown IGCC. |
