Research on 1000MW double reheat ultra-supercritical six-cylinder six-exhaust steam-turbine generator set

Abstract

This paper introduces the application technology of a millionsecond reheat ultra-supercritical six cylinder six exhaust steam turbine, through the analysis of six cylinder six exhaust steam overall design scheme, to calculate the stability of the shafting, and compared with the five cylinder four exhaust schemes. The results show that, the design scheme of six cylinder six exhaust steam turbine is breakthrough in the stability of shafting, at the same time, optimize the exhaust parameters of the low-pressure cylinder, make the unit back pressure at 2.9 kPa. Through the comparison of two schemes, six cylinder six exhaust steam turbine scheme can save the standard coal consumption by about 2.28 g/kWh per year, save coal cost about 6.27 million. However, the initial investment increased by 55 million, and the investment cost can be recovered in 8.8 years, its has high investment value and social benefits.