单轴恒速燃气轮机及其功热并供装置的典型变工况特性

利用作者在本期给出的单轴恒速燃气轮机及其功热并供装置的变工况显式解析解，本文给出它们的变工况典型性能．当变工况性能均以其设计值的比值表示时，不同设计值机组的各种无因次变工况性能曲线均分别在一条狭带之中，尤其是燃气轮机的效率基本就在一条线上，而且此线与实际数据相当符合．对以饱和蒸汽供热的功热并供装置，本文特别指出当设计蒸汽压力较高时，其余热锅炉逼近温差在低工况下很容易变为负值，要注意其安全运转问题．

TYPICAL PART-LOAD PERFORMANCES OF CONSTANT SPEED SINGLE SHAFT GAS TURBINE AND ITS COGENERATION

Typical part-load performances of single shaft gas turbine and its cogeneration aresummarized using analytical solutions obtained by the authors. It is pointed out when allparameters are represented by the ratio to design value, their variation in part-load canbe expressed in a narrow belt, especially the gas turbine efficiency variation can almostbe summarized as a single curve which is consistent with the practical data. The partload performances of cogeneration have not yet been comprehensively studied enough inopen literature, their variation rules are summarized in this paper for heat supply withsaturated steam. It is found that the steam flow rate and work/heat ratio are almost notinfluenced by the gas turbine design value and it is worth emphasizing that the approachingtemperature difference is likely be negative in low load condition with high steam parameterand low ambient temperature. However, many HRSG can not operated safely with negativeapproaching temperature difference. Some other part-load performances are summarizedalso.