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基于APROS支撑平台,对喷嘴配汽方式的汽轮机调节级进行变工况热力计算,通过文献提供的实验台实验数据进行对比验证;并研究分析了部分进汽对调节级内压比的影响,确定了不同部分进汽度下调节级效率变化曲线。结果表明,部分进汽不仅造成部分进汽损失,还对调节级内压比产生影响,致使焓降与反动度发生变化,进而引起调节级效率改变。同时,以600 MW汽轮机组为例,建立了考虑部分进汽对压比影响后的调节级效率简化数学模型。在此基础之上,基于量纲分析理论,分别将全开调节阀及半开调节阀后喷嘴组压比简化表示为流量比的函数,提出一种适用于喷嘴配汽的调节级变工况热力计算方法;将计算结果与借助支撑平台的热力计算结果对比,并探讨了喷嘴调节过程中压比与反动度的变化趋势。分析表明,所提出计算方法不仅准确反映部分进汽对级内压比的影响,还对现有的调节级变工况热力计算工作做了进一步完善。
Based on the APROS support platform, the calculation of the thermal performance of the turbine steam turbine with variable nozzle mode is carried out. The experimental data of the experimental bench provided in the literature are used for comparison and verification. The influence of partial steam intake on the internal pressure ratio of the control stage is studied and determined In different parts of the intake of the regulation level efficiency curve. The results show that part of the intake air not only causes some of the loss of intake air, but also affects the internal pressure ratio of the control stage, resulting in the change of enthalpy and reaction, which in turn causes the efficiency of the control stage to change. At the same time, taking the 600 MW steam turbine unit as an example, a simplified mathematical model of the efficiency of the regulating stage after considering the influence of some steam inflow on the pressure ratio is established. On the basis of this, based on the dimensional analysis theory, the pressure ratio of the full-opening regulating valve and the half-opening regulating valve rear nozzle respectively is simplified as a function of the flow rate ratio. The thermal calculation method is compared with the thermal calculation results by the support platform, and the change trend of pressure ratio and reaction rate during nozzle adjustment is discussed. The analysis shows that the proposed calculation method not only accurately reflects the influence of partial inlet steam on the internal pressure ratio, but also further improves the existing thermodynamic calculation of variable working condition.