Glass melting using fossil fuel flames and electricity - includes flame preheating to temp. at which baking together of raw material to itself or to furnace wall is avoided

摘要

Heating electrodes are located in the molten glass, which is also heated via fossil fuel flames and their flue gases above the melt. Cold lumps, e.g. briquettes, of the glass batch are fed into a preheating zone in countercurrent to the flue gases so they are preheated to a specific temp. at which the briquettes do not bake together or onto the walls of the preheating zone before they enter the melt. The briquettes or pellets may also be premelted by the flue gases before entering the molten glass, which pref. is at is not 1500 degrees C. The pref. plant consists of a tank furnace fitted with heating electrodes and a roof contg. a row of gas or oil burners. Optimum use of energy in melting and refining glass is achieved.