Abstract: The thermodynamic performance test of steam turbine involves the heat rate correction. For the exhaust steam pressure correction of the correction items, the manufacturer and related standards all suggest to correct the vaccum to the designed value. But in this method, some problems existed in certain equipments and cool terminal of the unit were covered up, so certain deviation will occur in practical examine of gross heat rate of a unit. In this paper a new correction method was proposed, in which only the influence of environmental temperature should be corrected, the vacuum value corresponding to the current temperature of the circulating water should be used as designed vacuum value of the unit in calculation and analysis. This method is more closer to the practical heat rate of unit operation, and has more direct instructive significance for the power plant in the energy saving and consumption reduction.


Key words: vacuum correction, temperature of circulating water, heat rate test