Thermodynamic analysis of a modified system for a 1000 MW single reheat ultra-supercritical thermal power plant

Release Time:2025-04-30  Hits:

• Date:2025-04-30
• Title of Paper:Thermodynamic analysis of a modified system for a 1000 MW single reheat ultra-supercritical thermal power plant
• Journal:Energy
• Summary:Thermodynamics analysis is performed on the modified steam system for a 1000 MW single reheat ultrasupercritical power plant and compared to the reference one. In the modified system, all the flue gas
  from the economizer is used to heat the partial condensate, and total air for combustion together with
  the rest of condensate is preheated by extraction steam from turbine. The flowrate of the partial
  condensate is adjustable to ensure its heat-capacity flowrate equivalent to that of the flue gas in the
  modified scheme, which avoids the pinch point of temperature difference of the air preheater in
  reference system. Results show that the exit temperature of flue gas from boiler can be reduced to a
  lower value without cold end corrosion and clog. The power generation efficiency of the power plant of
  48.35% is achieved, which is 1.27% points higher than that of reference unit at the same capacity. The
  improvement of thermal efficiency is mainly from both the low-grade heat recovery of flue gas by the
  flue gas-condensate preheater and the small temperature difference between the flue gas and the
  condensate, therefore a higher inlet water temperature of the economizer can be reached.
• Co-author:Yinhe Liu , Qinlun Li , Xiaoli Duan , Yun Zhang , Zhen Yang , Defu Che
• Volume:145
• Page Number:25-37
• Translation or Not:No
• Date of Publication:2018-02-15