Description
Class F23B : METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
Subclass 50/04: Combustion apparatus in which the fuel is fed into or through the combustion zone by gravity, e.g. from a fuel storage situated above the combustion zone the fuel forming a column, stack or thick layer with the combustion zone at its bottom the movement of combustion air and flue gases being substantially transverse to the movement of the fuel