| This paper provides the analyses and study of the calculation methods for thermal efficiency and selects equivalent enthalpy drop of varied heat to calculate thermal efficiency of Hai Bo Wan power plant. Thermal efficiency of steam turbine and extraction steam are calculated on the power load of 200MW and 150MW and 100MW. On the base of counted dates, the calculation methods for performance indices and the influence of their differential change on the specific coal consumption are deduced. In the end, some advices are brought forward for the operation control and where the energy consumption comes from.
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