Abstract: A furnace consists of at least one wall-mounted burner tilted downward for feeding air-fuel mixture and of a prism-shaped ash hopper. Slopes of the walls of lower combustion chamber region define the slotted mouth of ash hopper. The bottom airflow device is located below the ash hopper mouth the wall opposite to the airflow nozzle of the bottom airflow device has a concave form. In accordance with said invention the bottom airflow device spans along the entire width of the ash hopper mouth. The concave wall in its upper region meets the ash hopper mouth and an imaginary plane being a continuation of said concave wall crosses the opposite slopes of the wall of ash hopper in its middle region. The axis of bottom airflow nozzle passes along the lower region of said concave wall and is directed to form a 0-to-45 degree angle between said axis and lower region of said concave wall. The concave wall may be tilted relative to horizon at the angle of 20-45 degrees.

Abstract: A furnace is provided for burning soila organic fuels including highly volatile organic fuels. A combustion chamber with an ash hopper has a slot mouth opening defined by slopes of the walls of the combustion chamber. A burner is disposed beneath the ash hopper mouth opening and extends across its entire width. A bottom blast inlet device generates a turbulent zone in the lower region of the combustion chamber. A duct is further provided for injecting a sulfur-absorbent material into the furnace chamber. The duct is disposed between the burner and the ash chamber and defines a longitudinal axis which traverses the turbulent zone. Preferably, the burner is tilted downwardly and is disposed on a wall in common with the sulfur-absorbent induction duct. The proportion of the sulfur-absorbent materials in the fuel mixture is in the range of 10% to 100% by mass.