TURBINE STARTING METHOD BASED ON THE PREESTIMATION CALCULATION OF THREMAL STRESS

摘要

PURPOSE:To safely start a turbine by preestimating a thermal stress value by determining the preestimation value of temperature state at a prescribed point according to the supposition value of operation state of the turbine and by determining on of turbine controlling parameters after selecting the supposition value of operation state of the turbine. CONSTITUTION:The datas in the stop period of a turbine are applied to a temperature distribution initial value calculating function 6, and a thermal stress preestimating time determining function 7 determines the time to which the thermal stress to be preestimated and controlled belongs, and a rotor thermal stress calculation function 30 preestimates the distribution of rotor temperature after the preestimation time. A thermal stress preestimation function 34 calculates the rotor thermal stress on the basis of said preestimation value, and a variation rate seetting value determining function 8 allows the thermal stress caluculation function 30 to operate according to the prescribed variation rate, and the thermal stress preestimation value is obtaind, and compared with the thermal stress permissible value data 4, and the value which is below the thermal stress permissible value and with which the variation rate becomes maximum is selected among the expected parameters and given to a governor 12 as acceleration rate setting value data 13 or load variation rate setting value data 14. Thus, safety starting can be obtained.