Top-firing hot blast stove

Abstract

There is provided a top-firing hot blast stove including a burner and a burner duct capable of stabilizing an ignition point at a desired position inside the burner duct and suppressing occurrence of blinking phenomenon so as to achieve high combustion efficiency. A top-firing hot blast stoveincludes a checker chamberand a combustion chamberwhich includes a burner system and placed above the checker chamber. The burner system includes: a burnerprovided with a fuel gas pipeand combustion air pipesand a burner ductcommunicating with a burner exitof the burner, the burner ductcommunicating with the combustion chamberthrough a burner duct outlet, wherein an aperture enlarged portionwhere an aperture Dof the burner ductis enlarged is provided over a section from a middle of the burner ductto the burner duct outlet, so that an eddy current ED of the mixed gas MG flowing toward the combustion chamberthrough the burner ductis formed in the aperture enlarged portion