Improvement of energy and environmental efficiency of power plants by decreasing flue gases dew temperature

  • The possibility of decreasing flue gases dew temperature by injecting of gaseous NH3 into the flue channel of a power plant is shown in the paper. It is assumed that there is a chemical reaction 2×NH3(g) + SO3(g) + H2O(g) ® (NH4)2SO4(s) in the flue channel. Calculation of thermodynamic functions as well as a calculation of equilibrium DH, DS, DG, and Kp mixture synthesis reaction composition (NH4)2SO4(s) shown in the paper, indicates that by injecting of gaseous NH3 into the flue channel to the amount of 100 ppm and with water vapour volume fraction in flue gases from 5% to 50%, a reaction degree of SO3 grows and it is in 9% to 100% interval, respectively. During stoichiometric relation of reactant of the analyzed reaction, the reaction degree of SO3 is in interval from about 98% to 100%. Decreasing of volume fraction of SO3 in flue gases formed by injecting of NH3 has as a consequence decreasing flue gases dew temperature, prevention of low-temperature corrosion, as well as energy and environmental efficiency of thermo-electric power plant work, what is actually the purpose of the research in this paper. The product (NH4)2SO4(s) obtained by injection of ammonium into flue gases with a certain treatment, could serve as a nitro-fertilizer in agriculture.
  • Keywords
    flue gas, thermodynamic functions, equilibrium constant, dew temperature
  • Pages
    233 - 245
  • Submitted
  • Revised
  • Accepted
  • UDC
    0350-218X, 36 (2010), 2-3, 233-245
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