Abstract
In this paper, the thermal performance of a 300 MW subcritical steam turbine is studied. The influence of the flow remoulding technology on the heat dissipation rate is analyzed by comparing the thermal performance test data before and after the transformation and after the completion of the operation. It focuses on the reasons for the decline in thermal performance after four-year operation. Through the transformation of the flow remoulding can greatly enhance the efficiency of the steam turbine, the gap between the steam seal and cylinder defect are the main reasons for the decrease of the thermal performance of the steam turbine after four years of operation. After four years of operation, the efficiency of the steam turbine is still superior to that before the flow.
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