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New operating strategy for a combined cycle gas turbine power plant

机译：联合循环燃气轮机电厂的新运行策略

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摘要

The highly dynamic nature of power demand forces a combined cycle gas turbine (CCGT) power plant to often run at less-efficient part-load conditions. A new operating strategy called EGR-IGVC is proposed in this work to improve the part-load performance of a CCGT plant. The strategy partially recycles the flue gas from the heat recovery steam generator and manipulates the inlet guide vanes to regulate part-load operation and boost plant efficiency. It allows the CCGT plant to set its own acceptable gas turbine temperature limits at any time and thus maximize the plant performance. Our previous CCGT flow diagram in Aspen HYSYS [Liu and Karimi (2018)] is modified to accommodate EGR for evaluating EGR-IGVC. Then, using a case study CCGT plant, EGR-IGVC is compared in detail with the conventional inlet guide vane control (IGVC). The results show that EGR-IGVC improves the plant part-load performance significantly. It increases the plant efficiency by up to 1.2% (actual) and reduces the CO2 emissions by up to 13.8 kg MW-1 h(-1). By enabling an effective utilization of low-temperature waste heat and reducing the propensity for NO formation, EGR-IGVC promises to be a better strategy for the part-load operation of CCGT plants.
机译：电力需求的高度动态性迫使联合循环燃气轮机（CCGT）电厂经常在效率较低的部分负荷条件下运行。在这项工作中，提出了一种称为EGR-IGVC的新运行策略，以改善CCGT工厂的部分负荷性能。该策略可部分回收热量回收蒸汽发生器中的烟气，并操纵进口导流叶片来调节部分负荷运行并提高工厂效率。它允许CCGT工厂随时设置自己可接受的燃气轮机温度极限，从而最大限度地提高工厂性能。我们对Aspen HYSYS [Liu和Karimi（2018）]中以前的CCGT流程图进行了修改，以适应EGR以评估EGR-IGVC。然后，通过案例研究CCGT设备，将EGR-IGVC与传统的进口导流叶片控制（IGVC）进行详细比较。结果表明，EGR-IGVC显着提高了工厂的部分负荷性能。它可将工厂效率提高多达1.2％（实际），并减少多达13.8 kg MW-1 h（-1）的CO2排放。通过有效利用低温废热并降低NO生成的可能性，EGR-IGVC有望成为CCGT工厂部分负荷运行的更好策略。

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