联合循环机组中燃气轮机部件劣化对功率效率的敏感性分析

Power and Efficiency Sensitivity Analysis on Component Degradation of Gas Turbine in Combined Cycle Units

我国以市场换技术方式引进的F级燃气轮机,运行多年后其部件劣化不可避免。以机组现场运行数据为基础,应用回归分析法建立了燃气轮机的运行特性模型,并结合三压再热余热锅炉模型,研究了不同IGV开度下压气机劣化和透平劣化对联合循环机组功率、效率影响规律,以及对劣化所带来的影响提出了应对措施。以MPCP1-M701F联合循环机组为研究对象,分析表明:在相同IGV开度下,功率、效率的变化与部件劣化程度基本呈线性关系,透平劣化对功率、效率的影响大约是压气机的3倍;随着IGV开度的减小,功率对2种部件劣化的敏感性因子都呈下降趋势,效率对压气机劣化的敏感性因子呈上升趋势,但是对透平劣化的敏感性因子呈下降趋势。为弥补部件劣化带来的联合循环功率、效率下降,提出了调整IGV开度和改变透平排气温控线的方法来改善劣化工况,分析结果为挖掘机组的节能潜力提供参考。

The introduced F class gas turbines under market for technology policy in China are unavoidably facing performance degradation after several years＇ service. Through regression analysis on operation data, a mathematical model for gas turbine was obtained. Combining with the triple-pressure level heat recovery steam generator（HRSG）, the power and efficiency sensitivity of component degradation for gas turbine combined cycle（GTCC） power plant were studied at various IGV degrees. For the MPCP1-M701 F GTCC, the results show that the linear relation exits between the component degradation level and the change of power and efficiency in the same IGV degrees; the sensitivity of turbine degradation are about three times as great as that of compressor degradation. With the decrease in IGV degree, the power sensitivity of compressor degradation and turbine degradation declines; the efficiency sensitivity of compressor degradation increases while that of the turbine degradation decreases. The measures of changing IGV degree and adjusting turbine exhaust temperature control line are proposed to improve the GTCC performance. This study provides reference to the energy conservation of GTCC power units.