Abstract:

In 2×1000MW ultra supercritical secondary reheat steam turbine unit of second phase of Guodian Taizhou Power Plant, T3000 control system was taken as digital electrohydraulic(DEH)control system.The DEH control system is equipped with thermal state estimator (TSE) for calculating and monitoring the heat stresses of various metal components of steam turbines in different starting modes. The X criterion is one of the basis for the judgment and control of TSE. The proper temperature margin can make the steam turbine have good adaptability and reliability under variable working conditions. By introducing the significance of the X criterion under cold, warm and hot conditions before the turbine rushes, the conditions and methods corresponding to meet X criterions are analyzed, which provides a reference for the smooth turbine rushes of similar type.

Key words:

:turbines, secondary reheat, turbine rushes, X criterions, digital electrohydraulic (DEH), thermal state estimator(TSE)