Investigation of emission characteristics and temperature of furnace gases in BKZ-210-140F steam boiler: milled peat combustion and support flaming with natural gas

For the conditions of flame combustion of the milled peat with natural gas support flaring, the spectral radiation energy flux densities and emissivity factors of furnace gases are calculated for a situation of a furnace in BKZ-210-140F steam boiler. From the analysis of emission characteristics, a strategy was determined and a pyrometer set was selected for measuring the furnace gas temperature. For these pyrometers distributed over the furnace height, the temperature of the furnace gases was registered depending on the emissivity factor assigned for the pyrometers. The calculated spectral values of emissivity factor and pyrometer experimental functions give the furnace gas temperature for different spectral ranges. The study demonstrated a maximum temperature non-equilibrium about 850 K between the gaseous phase and the condensed particles for the zone of flame root (near the burners).