Patent ID: 7452497
Filing Date: 2008-11-18
Classification: C21B,F27B,F27D

Abstract:
1. A furnace sidewall structure of a rotary hearth furnace for manufacturing direct reduced iron from compacts, wherein the compacts are a mixture of iron ore or waste iron oxide and carbonaceous material as a reducing agent, wherein the compacts are placed on a rotating hearth and are reduced in a high-temperature atmosphere to thereby produce said reduced iron, or for heating at least one steel piece on the rotating hearth in a high-temperature atmosphere, said furnace sidewall structure comprising: an outer furnace sidewall, and an inner furnace sidewall, wherein at least one of the outer furnace sidewall or the inner furnace sidewall is polygonal in form, wherein the distance between the outer furnace shell and the inner furnace shell is at least 5 m, and wherein said polygonal furnace sidewall comprises a flat sidewall plate with a burner installed on said flat sidewall plate.