Patent ID: 6453831
Filing Date: 2002-09-24
Classification: C04B,F27B

Abstract:
A method for burning lumpy combustion material, comprising limestone, dolomite and magnesite in a regenerative shaft furnace comprised of at least two shafts (1, 2) which comprise a preheating zone (A), a combustion zone (B) and which are connected with each other above a cooling zone (C) by a transfer channel (3); wherebycombustion air is admitted at the head of one shaft (1), heated by hot combustion material as the combustion air flows through the preheating zone (A), and brought into contact with fuel before the combustion air enters the combustion zone (B); the combustion zone (B) of the one shaft (1) is flowed through by combustion gas produced in the combustion of the fuel; combustion gas is passed through the transfer channel (3) into the parallel shaft (2) and flows through said parallel shaft from the bottom to the top while transferring heat to the combustion material present in the parallel shaft (2); and cooling air is supplied to the lower end of the one shaft (1) and is heated as the cooling air flows through the cooling zone (C) by the hot combustion material exiting from the combustion zone (B); characterized in that combustion air heated in the preheating zone (A), and a partial stream of the cooling air heated in the cooling zone (C) are extracted from the one shaft (1) and supplied with fuel to a combustion chamber (11) in which the combustion gas for the combustion zone (B) is produced.