汽轮机旁路系统仿真建模

Simulation and Modeling of the Bypass System of a Steam Turbine

以汽轮机高压旁路系统作为对象,提出将旁路系统分为节流减压阶段和喷水减温阶段进行分段建模的思路,建立了旁路系统工作过程机理模型。利用设计数据和现场运行数据对仿真模型进行了验证,在不同工况下该模型的计算结果与设计值的相对误差均满足工程精度的要求,模型出口压力计算结果与设计值的相对误差小于3%,出口温度计算结果与设计值的相对误差小于1%,能很好地反映汽轮机高压旁路系统的工作过程。该模型作为燃煤发电机组全工况机理仿真模型的一个重要组成部分,为机组启、停和特殊变工况的能耗模拟研究奠定了基础。

With the high pressure bypass system of a steam turbine serving as the object of study,presented was an idea to model section by section the bypass system by dividing it into the throttle and pressure reduction section and waterspraying temperature reduction section. On this basis,the authors have established a model governing the working mechanism of the bypass system. By making use of the design data and those obtained from the on-the-spot operation,the simulation model was verified. The relative error between the calculation result of the pressure at the outlet calculated by using the model and the design value is less than 3% while that of the temperature is less than 1% . The relative errors between the calculation results and the design values all meet the requirements for the engineer-ing precisions and reflect very well the working process of the high pressure bypass system of the steam turbine. As an important integral part of the model for simulating the mechanism of coal-fired power generator units at the full load,the model under discussion has laid a foundation for simulating and studying the energy consumption under the start-up,shutdown and special off-design operating conditions of the units.