A flexible on-line monitoring method of the exhaust steam dryness in steam turbine

Based on the analyses of those existed calculation methods for turbine varying condition,the paper gives a sequential varying condition calculation that starts with steam extraction of the final stage or the second final stage(superheated steam condition).According to the initially assumed final stage flow,the thermodynamic parameters before the final stage,and the backpressure,the flow patterns of the stage can be distinguished by a discrimination criterion of varying condition,then a stage varying condition calculation can be conducted in sequence from the front parameter of the final stage,so the new exhaust steam enthalpy and the exhaust steam dryness can be got,and the precise heat consumption rate and the exhaust enthalpy(or the dryness) of the steam turbine can be got easily.Obviously,without measuring the flow or the exhaust steam dryness,the heat consumption rate and the dryness of the units can be monitored on line relatively accurate.