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

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.