Exergy-based performance analysis of the heavy-duty gas turbine in part-load operating conditions

Exergy, An International Journal Pub Date : 2002-01-01 DOI:10.1016/S1164-0235(01)00050-4

T.W. Song , J.L. Sohn , J.H. Kim , T.S. Kim , S.T. Ro

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引用次数: 43

Abstract

The present study describes details of exergy-based performance characteristics of a heavy-duty gas turbine, 150MW-class GE 7F model. Results have shown that a chemical reaction in the combustor of which the exergy destruction ratio is 28.3% at full-load is one of the major sources of exergy destructions in the gas turbine. It was found that, in spite of its usefulness to the performance enhancement of the combined cycle plant in part-load operations, the variable inlet guide vane located in front of the multi-stage compressor caused the increase of exergy destruction in the first stage (about 10 times lager than that of other stages below 80% load) and decreased the overall compressor efficiency. Also, it was discovered that the magnitude of exergy destruction by the cooling air in turbine stages is large enough to influence the overall turbine efficiency. The exergy destruction by the cooling air is more than half of the total exergy destruction of each cooled turbine stage.

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重型燃气轮机部分负荷工况下基于火用的性能分析

本研究详细描述了150mw级GE 7F型重型燃气轮机的火用性能特征。结果表明，燃烧室内的化学反应是燃气轮机满负荷时火用破坏率为28.3%的主要火用破坏源之一。研究发现，多级压气机前部的可变进口导叶虽然对提高联合循环装置部分负荷运行时的性能有一定的作用，但却造成了一级的火用破坏增加(约为80%负荷以下其他级的10倍)，降低了压气机的整体效率。此外，还发现涡轮级冷却空气的火用破坏程度足以影响涡轮的整体效率。冷却空气的火用破坏占冷却涡轮各级总火用破坏的一半以上。

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Exergy, An International Journal

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