Process for generating heat and producing sponge iron

US4676824A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventors

• Georg Daradimos · Maintal, DE
• Martin Hirsch · Friedrichsdorf, DE
• Wolfram Schnabel · Idstein, DE

Key dates

• Filing date: Jul 31, 1985
• Grant date: Jun 30, 1987
• Expiry date: Jul 31, 2005

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/32
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

Sponge iron is produced by a direct reduction of iron oxide containing materials in a rotary kiln, the material discharged from the rotary kiln is separated into sponge iron and material which contains surplus carbon, the carbon-containing material is burnt in a fluidized bed reactor containing a circulating fluidized bed, and the heat generated by the combustion is recovered and utilized to produce electric power. To ensure a utilization of the surplus energies of the rotary kiln process and to minimize the contents of SO.sub.2, NO.sub.X, and CaS, the dust-containing exhaust gas from the rotary kiln is supplied to the fluidized bed reactor and is afterburnt therein, at least a major part of all oxygen-containing gases supplied to the fluidized bed reactor is supplied as a fluidizing gas to the lower portion of the fluidized bed reactor, the combustion of the combustible constituents is effected with an over-stoichiometric oxygen content, and the solids entrained by the gases discharged from the fluidized bed reactor are recycled to the fluidized bed reactor in such a manner that the weight of solids circulated per hour is at least 5 times the weight of the solids contained in the …