Мониторинг термонапряжённого состояния паровых турбин

Abstract

The principles of constructing a program for monitoring stresses in rotors, lock-off and control valve bodies of steam turbines without intermediate steam overheating with a capacity of up to 180 MW inclusive, to control starting processes, are presented. The program, based on the results of previous experimental studies by the VTI and ORGRES and calculations using the finite element method, is intended for microcomputers, the hardware of which is integrated into the electronic part of the control system or in the automatic process control system. In the process of program operation, according to the data obtained using standard measuring instruments, the stresses arising in the “critical” elements of the steam turbine are evaluated, compared with acceptable values for this material, depending on operating temperatures, service life, design and other parameters, and signals are generated that enable the start-up process to be adjusted. The values of equivalent operating hours calculated at the same time make it possible to assess the quality of starting and stopping modes, the accumulated damage and the share of resource exhaustion. These data can be taken into account when deciding on the conduct of certain maintenance activities. The algorithm of the voltage monitoring system is implemented in the program for limiting the gaining rotation speed and changing the power of the thermally stressed state of the rotors of the high and medium pressure cylinders of the T-185 / 210-16.0 turbine in the volume of the EPSR.