ABSTRACT
Boiler combustion and efciency calculations are the starting point for boiler performance evaluation. These calculations enable the boiler designer or the plant engineer to estimate the boiler efciency, air quantity required for combustion, and ue gas quantity generated in a boiler or heater; ue gas analysis that impacts convective and nonluminous heat transfer coefcients, adiabatic combustion temperature, ue gas specic heat, and enthalpy is also obtained from combustion calculations; these data in turn aid furnace performance evaluation, sizing, or performance evaluation of heat transfer equipment in the gas path, help evaluate air-and gas-side pressure drops, and also estimate the water and acid dew point temperatures. CO, NOx, and CO2 emission conversion calculations also require that results of combustion calculations are available. If NOx emission is to be limited, then one has to estimate the amount of ue gas recirculation (FGR) to dampen the combustion temperature that impacts NOx formation. Thus, basic and useful information for boiler performance evaluation can be generated from combustion calculations. The emphasis in this chapter is on oil and gaseous fuels. Sometimes, multiple fuels are red in a boiler simultaneously, and this issue is also discussed.
