Patent ID: 8419344
Filing Date: 2013-04-16
Classification: F01D,F01K,F05D,Y02E

Abstract:
1. A system, comprising: a physical computing device having a tangible machine-readable medium comprising code that, when in operation: determines an efficiency of a section of a steam turbine based on a relationship between enthalpy difference values and leakage flow rate values between adjacent sections of the steam turbine, wherein the relationship includes a point of relating an enthalpy of the leakage and an enthalpy at a destination of the leakage, wherein the point of relating the enthalpy of the leakage and the enthalpy at the destination of the leakage is achieved by adjusting a temperature of at least one of the adjacent sections of the steam turbine; calculates a plurality of enthalpy difference values between a first inlet into an intermediate-pressure section of the steam turbine and a second inlet into a high-pressure section of the steam turbine for a plurality of operating points of the steam turbine; calculates a plurality of mid-casing packing leakage flow rate percentages based at least in part on a plurality of mid-casing packing leakage enthalpies for the plurality of operating points and an assumed efficiency of the intermediate-pressure section; and determines a true efficiency of the intermediate-pressure section based on a relationship between the plurality of enthalpy difference values and the plurality of mid-casing packing leakage flow rate percentages.