带过载补汽节流配汽机组变压运行特性研究

带过载补汽节流配汽超临界汽轮机组的协调控制系统自带的变压运行曲线,在实际应用中出现一、二次调频能力受限和低负荷协调控制系统异常退出等设备隐患,危及电站和电网的安全运行。通过小步幅连续变化主蒸汽压力,应用变压运行定量计算模型,充分考虑热力系统各主要变量间的相互耦合,实现机组热耗在同一负荷滑压运行可行初压区间内的全局动态寻优。得到机组在变压工况下的热耗变化趋势,为现场机组安全高效运行起到了有效的指导作用。

Research on Variable Pressure Operating Characteristics of Throttling Units with Additional Supplying Steam at Overload

For the operation curve of the coordinated control system of the supercritical throttling steam turbine with additional supplying steam at overload in practical application, the primary and secondary frequency regulation is limited and abnormal low-load jump coordination happens, which endanger the security of power stations and grids. Through changing the main steam pressure continuously with small steps, using the model for variable pressure operation quantitative calculation and taking full account of the mutual coupling between the main variables of the thermodynamic system, the overall dynamic optimization of the unit heat rate is realized in the same load sliding pressure operation range and the trend of the heat consumption is obtained, which becomes a guideline for the safe and efficient operation of the unit.