Specifics of Modeling of Technological Processes in CCGT Steam Turbines in Operation at the Low Mass Flow Mode

Abstract

Possible modes of operation of PGU-450 with deep unloading of the T-125/150 steam turbine under electric load are considered. The methods of steam distribution bypass, transfer of part or all of the CHP of the steam turbine in low steam and motor modes in emergency modes of CCGT or its operation in deep unloading modes with the passage of failures of power consumption graphs are considered. We describe the technical and hydrodynamic characteristics of these regimes and their accounting in the modeling of technological processes in the work stages of the steam turbine CCGT and low mass flow and motor modes. We show the features of mathematical modeling of the stage and turbine compartment operation in these modes on the example of the T-125/150 steam turbine operation in the mode with the transfer of a part of the CHP to a low-steam mode. We present the results of calculating the temperature state of the turbine blades at the direct and countercurrent motion of the cooling steam. The possibility of controlling the temperature state of the flow part of the CHP during the operation of the steam turbine in the motor mode is shown.