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Thermodynamics and the Design, Analysis and Improvement of a Combined Heat and Power System

Author Affiliations

  • 1YMCA University of Science and Technology, Faridabad, Haryana, INDIA
  • 2 Gateway Institute of Engineering and Technology, Sonipat, Haryana, INDIA
  • 3 University Institute of Engineering and Technology, M.D.University Rohtak, Haryana, INDIA
  • 4
  • 5
  • 6

Res. J. Recent Sci., Volume 1, Issue (3), Pages 76-79, March,2 (2012)

Abstract

In the present analysis combustion products coming out from the gas turbine (GT) are studied on the basis of their concentration. A computer program is made in EES and different parameters are studied for the analysis. From the result it is observed that if regenerator is used in the gas turbine cycle then the concentration of N2 and O2 is 0.91% and 1.41% higher respectively in flue gases than that of GT cycle without regenerator. The concentration of CO2 and H2O is 2.17% and 17.64% lesser respectively in flue gases for GT cycle with and without regenerator. As the fuel is the combination of the carbon and hydrogen, after burning with oxygen it generates heat energy, CO2 and H2O. That is why concentration of H2O and CO2 in combustion product increases and that of oxygen decrease. Results show that enthalpy of combustion products at a temperature of 155°C is -28077 kJ/kmol for GT cycle with regenerator and for without regenerator enthalpy is -28027 kJ/kmol at a temperature of 389°C. From the results it may be concluded that regeneration not only increases the efficiency of GT cycle but generates a concentration of N2, O2, CO2 and H2O in such a manner that enthalpy of combustion gas is increased. Regenerator lowers the exergy destruction in the cycle and increased the fuel utilization efficiency for the cycle. Exergy destruction in most of the thermal systems is due to combustion/chemical reaction, heat transfer and friction including unrestrained expansions of gases and liquids. The inefficiency of combustion may be reduced by preheating the combustion air and reducing the air fuel ratio.

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