GASIFICATION MELTING FURNACE FOR WASTES AND GASIFICATION MELTING METHOD

摘要

By using a gasification and melting furnace for wastes having a vertically movable furnace center lance disposed along the axis of the furnace and adapted to blow off a combustion sustaining gas downward into the furnace, one or more stages of upper tuyeres disposed so that the angle at which the combustion sustaining gas is blown off into the furnace is displaced from the furnace axis direction, and one or more stages of lower tuyeres projected into the furnace so as to blow off a combustion sustaining gas or both combustion sustaining gas and fuel toward the furnace axis, it is possible to prevent the formation of a low temperature region in the furnace and concentrate a fire spot for the combustion of wastes. As a result, molten slag and various metals, as well as an energy gas, which are high in added value, can be recovered stably. Further, if the ratio of the diameter, df, of a fire spot formed by the furnace center lance to the inside diameter, D, of the furnace is controlled to df/D