In the case of 30% excess air and 20% secondary air,
the axial temperature distribution along the combustor
height for various poultry wastes co-combustion is
shown in Fig. 2. It can be seen that the temperature increases
rapidly to 850–875 C in the bed region and
maintains 800 ± 40 C in the freeboard region. The highest
temperature in the bed occurs at the same height of
the fuel injection that is in accordance with the highest
concentration of combustible materials at that height.
In the secondary air injection area, the temperature
drops slightly due to air consuming energy, and the temperature
increases significantly above that area because
the injection of the secondary air attributes to burn
the unburned fine particles and volatiles.