No abstract

No abstract

No 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.

In this paper, the optimal operation system of circulating water of thermal power unit is perfected. Through field test and theoretical calculation in different thermal power plants, the optimal operation mode of circulating water of different modes is determined under different load, water temperature and exhaust steam pressure of low-pressure cylinder. Taking the coal consumption rate of power supply unit as the objective function of circulating water system optimization, the analysis and calculation model of circulating water system optimization was established. The influence coefficient of exhaust steam pressure on power and heat consumption rate between low load condition and rated condition was studied by field measurement and theoretical calculation method, so as to improve the accuracy of optimization conclusion in low load condition.