Modeling of Steam Turbine Control Stage Under Variable Conditions Based on Operation Data

By neglecting the reaction degree of steam turbine control stage, an algorithm was proposed for estimating the pressure and temperature after control valve, which laid a foundation for establishing a mathematical model of the control stage under variable conditions using actual operating data of the turbine. For the 330 MW steam turbine of a power plant, according to the opening and closing state of the valve, a dominant factor model was established and verified for the control stage in the sequential valve operation mode based on the method proposed, and subsequently, the flow rate and efficiency characteristics of the control stage were calculated within the full condition range. Results show that the model can accurately calculate the pressure and temperature after the control stage, which proves the proposed method to be reliabile.