Main steam parameters will deviate from design values inevitably during actual operation of steam turbines

causing changes in unit power and economic indexes. Thus

the equivalent enthalpy drop method and partial differential method were applied to solve this problem. The advantages

disadvantages and application conditions of each method were compared. Moreover

by taking operation data of an N600-16. 7 /537 /537-I type steam turbine as the example

models from the above two methods were validated. The results show that

both the models have accurate results

and are convenient

universal

suitable for practical engineering application. However

as the partial differential method makes certain assumptions on the premise

its calculation accuracy is not that high as the equivalent enthalpy drop method.