Dynamic Characteristic Analysis of Steam Bypass Exhaust System of Steam Turbine
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摘要: 从流体的基本守恒方程出发，使用临界流模型计算各出口蒸汽流量推导和建立了蒸汽旁路排放系统的动态模型。为了获得汽轮机蒸汽旁路排放系统的动态特性，在MATLAB & Simulink仿真平台上使用机理法建立了瞬态模型，通过引入多种边界条件扰动确定了蒸汽旁路排放系统的动态特性；分析了其中的蒸汽流量与排凝汽器阀扰动的瞬态响应，瞬态仿真结果符合物理规律，这些结果对后续的汽轮机蒸汽旁路排放控制系统的设计具有重要意义。Abstract: Based on the basic conservation equation of fluid, uses the critical flow model to calculate the steam flow at each outlet, and deduces and establishes the dynamic model of steam bypass exhaust system. In order to obtain the dynamic characteristics of the steam bypass exhaust system of steam turbine, a transient model is established on the MATLAB & Simulink simulation platform by using the mechanism method. By introducing a variety of boundary condition disturbances, the dynamic characteristics of the steam bypass exhaust system are determined. The transient response of steam flow and exhaust condenser valve disturbance is analyzed. The transient simulation results accord with the physical law. These results are of great significance to the subsequent design of steam turbine steam bypass exhaust control system.
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