Abstract
In order to further reduce the power supply coal consumption rate for 300MW subcritical units, this paper will conduct a comprehensive analysis to improve the main steam and reheat steam parameters of those units based on the basic principles of thermodynamics, steam turbines and water pumps. The analysis shows that for the subcritical unit retrofit method that only raises the main steam and reheat steam temperature as the basic technical route has better feasibility. On this basis, combined with the actual system and working conditions of the 320MW subcritical unit, a simulation model of the entire plant’s thermal system is established for calculation and analysis. The calculation results show that the heat consumption rate of the high-temperature subcritical retrofit can reach 7526.7kJ/kWh. Combined with China Resources Xuzhou #3 unit high temperature subcritical comprehensive retrofit project (using high temperature subcritical transformation and equipped with special energy saving transformation), A comprehensive analysis of the performance of the unit after retrofit. The analysis shows that the coal consumption rate after the retrofit is reduced by 36g/kWh.
Highlights
Under the trend of global warming, the coal power industry, is sustain great pressure to reduce emissions[1]
In order to further reduce the power supply coal consumption rate for 300MW subcritical units, this paper will conduct a comprehensive analysis to improve the main steam and reheat steam parameters of those units based on the basic principles of thermodynamics, steam turbines and water pumps
In order to further improve the efficiency of coal-fired power plants, the National Energy Administration and other three ministries issued a document named the "Six Year Action Plan" in 2014, which required that the annual average power consumption of coal-fired units with a capacity of 300MW should be less than 310g/kWh3
Summary
Under the trend of global warming, the coal power industry, is sustain great pressure to reduce emissions[1]. The actual annual average coal consumption of most 300MW subcritical units is about 340g/kWh4. For the subcritical turbine flow path retrofit project, the domestic turbine manufacturers generally have the prominent problems that the turbine efficiency declines rapidly[8,9]. There are few "single-lift" modifications of initial and reheat parameters, especially retrofit that only increase the main steam and reheat steam temperature. The results show that the heat consumption rate of the high temperature subcritical transformation can reach 7526.7kJ/kWh based on the technical route of only increasing the temperature of main steam and reheat steam. Combined with the case analysis of China Resources Xuzhou example hightemperature subcritical comprehensive retrofit (Adopt high temperature subcritical retrofit, and equipped with special energy-saving transformation), the coal consumption rate decreases by 36g/kWh after transformation, and the coal consumption rate can reach 281.95g/kWh.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
