TEMPERATURE DECREASE AND EXERGY LOSS DUE TO DISSOCIATION OF COMBUSTION GASES

There have been carried out calculations of the equilibrium compositio n of combustion gases obtained from adiabatic combustion of gaseous fu els at various temperature levels of preheated air. The following comp onents of combustion gases have been taken into account: CO2, CO, H2O, H-2 O-2, N-2, OH, O, H, NO. The approximate formula expressing the te mperature decrease due to dissociation as a function of the calorimetr ic combustion temperature, C/H-2, O-2/(C + 0.5H(2)), and N-2/O-2 ratio s in combustion gases has been worked out. The relative loss of exergy due to thermal dissociation has been calculated, as well. A method fo r the calculations of total enthalpy of combustion gases has been prop osed.