동일한 정격출력을 생산하는 수소 혼소 가스터빈 복합발전의 작동상태와 효율 변화 분석

초록

Three operation scenarios of a 20MW class hydrogen co-fired gas turbine combined cycle (GTCC) plant were comparatively analyzed. The basis of comparison is that the plant produces the same rated power as it would operate with natural gas. The fuel flow rate and the variable inlet guide vanes (VIGV) angle of the compressor inlet were used as manipulating variables to simulate the power plant operation environment. The control variable was either turbine inlet temperature (TIT) or turbine exhaust temperature (TET), depending on specific operation scenario. Each operation scenario was applied to the GTCC to analyze changes in plant operation conditions and efficiency according to the hydrogen co-firing ratio. In the case when only the fuel flow rate was manipulated, the GTCC efficiency increased by 0.049%p based on hydrogen burning, and in the case of the operation scenario to keep the TET constant, the GTCC efficiency increased by 0.258%p. In the case of the operation scenario to keep the TIT constant, the GTCC efficiency increased by 0.288%p. These results are expected to be used in further studies to analyze changes in GTCC　performance due to hydrogen co-firing under a very wide variation in operation conditions.

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