Condensing pressure daily variation in the steam power plant with closed cycle cooling system during summer day

  • Energy efficiency of the steam power plant strongly depends on the condenser pressure. Changes in condensing pressure of 1 kPa leads to change in energy efficiency of 1%. Change of the pressure in the condenser occurs primarily due to changes in temperature and / or the flow rate of cooling water at power plants with once-through cooling system, and more expressive in plants with closed-cycle cooling system. Changes of atmospheric air parameters, especially relative humidity and temperature, directly affect the temperature change of the water on output of the cooling tower, and in that way of the inlet temperature in the condenser. This change causes a change of condensing pressure. Air parameters are changing continuously with significant fluctuations during one day. Due to those fluctuations, daily fluctuation of energy efficiency of the power plant occurs. This is especially pronounced during the summer, when high air temperature leads to decrease the efficiency of the plant. In this paper, the daily changes in temperature of water cooled in the cooling tower with forced draft depending on the atmospheric air parameters for an average summer day are considered. Also, impact of those changes on the condensing pressure, thus air parameters influence on this pressure is obtained for the reference plant, 110 MW power plant 'Kolubara A', unit A5. Air relative humidity and temperature are obtained for every hour during selected days with automatic meteorological measuring stations located in the vicinity of the reference plant. The results can be generalized for a longer period of time.
  • Keywords
    condensing pressure, air temperature and relative humidity, cooling water, energy efficiency
  • Pages
    93 - 102
  • Submitted
    02/20/2010
  • Accepted
    03/08/2010
  • UDC
    621.311.22:66.045.1
  • BIBLID
    0350-218X, 36 (2010), 1, 93-102
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