Patent ID: 9011571
Filing Date: 2015-04-21
Classification: C22B,F27B

Abstract:
1. A method for oxidation and sintering of pellets arranged in a compartment in which oxidation and sintering take place with a medium with a determined temperature that heats the pellets, the method comprising: introducing a first medium into the compartment through an inlet connected to the compartment; heating the first medium in the inlet through use of a combustion arrangement, or a part of a combustion arrangement, arranged in the inlet, wherein the combustion arrangement or part thereof comprises fuel, where the use of the combustion arrangement or part thereof comprises ignition of the fuel, a combustion of the fuel whereby combustion heat is developed, and a transfer of the combustion heat to the first medium that is present at the combustion arrangement or part thereof; wherein the combustion arrangement, or a part of it, is in a region in the inlet that in turn is arranged outside of a direct passage of the first medium in and through the inlet such that the ignition of the fuel, the combustion of the fuel and the transfer of combustion heat to the first medium all take place in this region; introducing a second medium into the region in a direct vicinity of the combustion arrangement, or a part of it, where the ignition of the fuel, the combustion of the fuel and the transfer of combustion heat also to the second medium take place followed by further transport of the heated first medium and the heated second medium through the inlet and into the compartment; and preheating the first medium before it is introduced into the inlet and preheating the second medium before it is introduced in the vicinity of the combustion arrangement in the inlet, wherein the first medium and the second medium are preheated to different temperatures.