The invention belongs to the field of
combustion furnaces, and particularly relates to a
smoke secondary
combustion furnace. At present, in the use process of an ordinary
combustion furnace, the mainpollution is that in the fuel adding process of the combustion furnace, particularly relates to a civilian combustion furnace, when a fire
coal is added and stirred, emission of
smoke reaches the highest peak, the high emission duration of the
smoke dust can be up to several minutes or even more than ten minutes, in this case, due to the
hearth is in a smoldering state, so that the temperature ofthe
hearth is lower than the
internal temperature of the fire
coal in the furnace, therefor, the smoke dust at the moment is difficult to
burn out. According to the smoke secondary combustion furnace,smoke dust combusted in the
hearth of the combustion furnace is introduced into a smoke preheater above a furnace grate in the hearth again through a
chimney, the smoke preheater is always located inwrapping of the fire
coal in the hearth, and therefore it can be guaranteed that the smoke preheater is always in a high-temperature state; when the
oxygen-containing smoke dust passes through a preheating cavity of the smoke dust preheater, the
oxygen-containing smoke dust is heated to be higher than the
ignition point by a high temperature, the
oxygen-containing smoke dust is combusted, and finally clean gas is discharged.