Importance

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Abstract

A method for burning lumpy combustion material, in particular limestone, dolomite and magnesite, in a regenerative shaft furnace comprising at least two shafts (1, 2) comprised of a preheating zone (A) as well as a combustion zone (B). The shafts are connected below a cooling zone (C) by a transfer channel (3). The combustion air is charged at the head of one shaft (1), heated by hot combustion material as it flows through the preheating zone (A), and brought into contact with fuel before it enters the combustion zone (B). The combustion zone (B) is flowed through by combustion gas produced in the combustion of the fuel. Cooling air is admitted at the lower end of the shaft (1) and, as it flows through the cooling zone (C), heated by hot combustion material exiting from the combustion zone. According to the invention, the combustion air heated in the preheating zone (A) and at least one partial stream of the cooling air heated in the cooling zone (C), are extracted from the shaft (1) and supplied with fuel to a combustion chamber (11), in which the combustion gas for the combustion zone (B) is produced. Furthermore, the object of the invention is also a regenerative shaft furnace for carrying out the method.

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First Claim