基于背压实时修正的汽轮机滑压运行曲线综合优化

Steam Turbine Sliding Pressure Curve Colligation Optimization based on Real-time Correction Using Back Pressure

目前,一些大功率火电机组也不得不进行快速深度变负荷运行,参与调节电网峰谷差、配合接入大规模新能源电力并网运行。分析了空冷机组背压大范围变化对汽轮机最优滑压运行曲线的影响,鉴于传统滑压运行曲线设计及实现方式的局限性,提出了考虑背压变化的滑压运行曲线综合优化及实现方法,利用背压在线实时修正最优主蒸汽压力以适应直接空冷机组的背压大范围变化工况。针对实际机组进行运行试验,结果表明该方法对进一步改善空冷机组变负荷运行的高效性具有一定实际应用价值。

Currently,a number of high-power thermal power units also have to be quick depth variable load in order to regulate the grid peak-valley difference and join up large-scale new energy power into network. This paper analyzes the influence of baekpressure varying in large range on the optimal operation pressure of air-cooled steam turbine. Due to the limitations of traditional sliding pressure operation curve in designing and implementing, this paper proposes that considering the influence of backpressure is necessary, when optimizing the sliding pressure operation curve and achieving it. The optimal value of main steam pressure is corrected by using real time online method with back pressure in order to adapt the large range of back pressure for direct air cooling unit. The results from the actual operation test show that this method has practical value to further improve the air-cooled unit efficiency in varying load operation.