Shavings--or chips--fired burner unit for heating boilers

Claim 1

A burner unit for shavings or chips for firing in a boiler, including a combustion chamber, fire bars and a stoker apparatus for feeding the chips to the boiler comprising: a feeder stub, said stoker apparatus of the burner unit being connected to said feeder stub arranged in an upper portion of the boiler; control means for the burner unit for regulating the quantity of chips fed by the stoker apparatus; a predesiccation chamber for the burner unit being positioned inside the combustion chamber of the boiler above the fire bars in the boiler; said predesiccation chamber being formed of several separate building components with the same shape at their upper and lower portions, and with mainly closed side walls; said building components being insertable into an existing boiler and being stackable one on the top of the other within the boiler; an upper portion of said building components being adapted to receive the chips fed in through the feeder stub; a middle portion of said building components is a chip chamber provided with a sloping plane for feeding chips to an adjustable firing grid; and a lower portion of said building components is formed for the combustion of the chips and for the ignition of the chips; said firing grid being formed as an outlet below the chip chamber.