Importance

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Abstract

During the melting of glass from charging material in furnaces with burners and regenerators for the recovery of waste heat, oxygen and primary fuel are introduced into the area around the flame roots under slightly sub-stoichiometric conditions to cover the heat requirement of the melting process. In order to further reduce the levels of NO.sub.x, and CO in the waste gases by re-burning or post oxidation, secondary fuel and, further downstream, additional air are introduced beyond the flame in order to reduce the level of NO.sub.x, in or above the checkerwork by means of the secondary fuel and to carry out re-burning or post oxidation downstream by means of the supply of air, so that ultimately approximately stoichiometric combustion takes place. Before the waste gases enter a waste gas stack they are used to preheat the charging material in at least one raw material pre-heater. In order to ensure an almost total recovery of the energy content of the fuel and a continuous flow of the charging material, the temperature of the waste gases coming from the regenerators is measured in front of the entry of the at least one raw material pre-heater, and the quantity of the secondary fuel is regulated according to the temperatures measured.

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First Claim