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
    06/15/2010
  • Revised
    09/28/2010
  • Accepted
    10/01/2010
  • UDC
    662.96
  • BIBLID
    0350-218X, 36 (2010), 2-3, 233-245
  • References
    • Amelin, A.G. (1964) Sulfur acid manufacture. Moscow: Himiya
    • Barin, I., Knacke, O., Kubaschewski, O. (1973) Thermochemical properties of inorganic substances. Berlin-New York: Springer Verlag, Supplement 1977
    • Barreras, F., Barroso, J. (2004) Behavior of a high-capacity steam boiler using heavy fuel oil, part II: Cold-end corrosion. Fuel Processing Technology, 86, 2, 107-121
    • Crnomarković, N., Repić, B., Mladenović, R., Jovanović, M.P., Manović, V. (2001) Redukcija emisije SOx i NOx na energetskim postrojenjima kombinovanom primenom gasifikacije i sagorevanja uglja. Termotehnika, vol. 26, br. 1-4, str. 3-10
    • Đurić, S.N. (2003) Istraživanje uticaja procesnih parametara gasova koji se emituju u atmosferu na uslove kondenzacije. Beograd: Mašinski fakultet, Doktorska disertacija
    • Falk, C. (2007) Ammonium sulphate deactivation of SCR DeNOx catalysts. Sweden: Department of Chemical Engineering, Lund Institute of Technology
    • Johnson, D.A. (1982) Some thermodynamics aspects of inorganic chemistry. Cambridge - London - New York: Cambridge University Press
    • Koretsky, M.D. (2004) Engineering and chemical thermodynamics. New York, USA: John Wiley and Sons, Inc
    • Kuburović, M., Petrov, A. (1994) Zaštita životne sredine. Beograd: SMEITS
    • Pihu, T., i dr. (2009) Corrosion of air preheater tubes of oils shale CFB Boiler. Oil Shale, 26, 1, 5-12, Part I: Dew Point of Flue Gas and Low-Temperature Corrosion
    • Rodriguez, G., i dr. (2006) Influence of material choice on cost estimation of some key components of the sulfur Iodine thermochemical process. u: Proceedings, 16th World Hydrogen Energy Conference, Lyon, France, June
    • Shuwi, K., i dr. (2006) Abalysis of exhaust gas visibility in iron ore sinterig plant. ISIJ International, 46, 7, 1027-1032
    • Smolenski, J. (2008) Ammonia injection for control SO3: Effectiveness and secondary impact on fly ash and FGD process stream. Tampa: Tampa Electric Company
    • Smyrniotis, C.R., Schulz, K.W. Controlling SO3 in coal and oil fired utility boilers: Technology and experience. Fuel Tech, 1-13, TPP-570
    • Spivey, J.J. (2002) Catalysis. Cambridge, GB: Rojal Society of Chemistry, Vol. 16
How to cite this paper
Additional references about the paper
Links given above have only informational character and there is a possiblility that they might contain inaccurate or incomplete information