City refuse incinerator for the prevention of clinker formation

Claim 1

A city refuse incinerator for the prevention of clinker formation comprising a furnace body having a sidewall, said refuse incinerator being provided with stoker type firing equipment for moving refuse through said furnace body, and an inert gas circuit comprising: gas injection positioned in said furnace body and directed to inject gas into said furnace body adjacent said sidewall, a dust collector means coupled to said furnace to receive and purify a combustion gas led from the furnace body, a temperature reducing means for lowering the temperature of the combustion gas passing through the dust-collector means and a circulation fan for supplying this purified low temperature inert combustion gas from the dust-collector means to the gas injectors, said gas injectors injecting said inert gas to form a gas curtain concentrated at the inside of said sidewall of the furnace body to thereby inhibit the formation of clinkers on said sidewall; said gas injectors being formed by a gas injector apparatus which includes a hollow pipe member installed between said stoker type firing equipment inside the furnace body and the sidewall of the furnace body, the upper side of said hollow pipe member having steps shaped thereon with injection openings in the front faces of said steps, said hollow pipe member further having a gas inlet opening for receiving said purified low temperature inert combustion gas from said dust collector, a selectively operated valved foreign matter discharge opening downstream of said injection openings and a selectively operated valved pressurized air source upstream of said injection openings, whereby said valved foreign matter discharge opening and said selectively operated valved pressurized air source are normally closed to allow said purified low temperature inert combustion gas entering from said gas inlet opening to be passed through said injection openings but being selectively opened for sending compressed air through the hollow pipe member so as to drive foreign matter from the hollow pipe through the foreign matter discharge opening.