Deutsche Voest-alpine Industrieanlagenbau Gmbh

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Voest-alpine Industrieanlagenbau Gmbh & Co.

Herbert Mizelli

Johann Wurm

Leopold Werner Kepplinger

G&uuml;nther Brunnbauer

Walter Rainer Kastner

Kurt Wieder

Josef Stockinger

Parviz Zahedi

The invention relates to a process for producing pig iron or liquid primary steel products in a blast furnace, CObeing substantially removed from at least a partial stream of a top gas emerging from a reduction shaft furnace (), and this partial stream if appropriate being heated and being introduced into the blast furnace as reduction gas, and to a plant for carrying out this process, the top gas being introduced into the lower region of the blast-furnace shaft. This measure results in an improved energy balance and improved process management compared to the prior art.

Method and device for producing pig iron or liquid steel pre-products from charge materials containing iron ore

Process and apparatus for producing liquid pig iron or primary steel products from iron-containing material in lump form in a fusion gasifier ( ), in which, with lump coal and oxygen-containing gas being fed in, and with simultaneous formation of a reduction gas, the iron-containing material is fused, lump coal being fed to the fusion gasifier ( ) from above and, together with the iron-containing material, forming a fixed bed ( ) in the fusion gasifier ( ) and thereby giving off its fraction of volatile hydrocarbons into the dome space ( ) located above the fixed bed ( ), and pulverized-fuel burners ( ) being directed obliquely from above towards the surface of the fixed bed ( ). The operation of the pulverized-fuel burners ( ) is in this case controlled in such a way that the combustion of the carbon fraction of the carbon carriers in fine particle form takes place in a proportion of at least 40% to form CO .

Method for producing liquid pig iron

In a method for producing a hot CO- and H -containing reducing gas serving for the reduction of fine-grained metal ore, in particular iron ore, the reducing gas is formed in a gasification zone by a gasification of carbon carriers, in particular coal, taking place under the supply of oxygen and subsequently is cooled down to a reducing-gas temperature favorable to the reduction process. In order to produce a thermodynamically more stable reducing gas, the reducing gas by the addition of H O and/or CO &mdash;in order to prevent the Boudouard and heterogeneous water-gas reaction and a resultant heating of the reducing gas&mdash;is converted to a reducing gas that is thermodynamically more stable at the reducing-gas temperature.

Method and plant for producing a reducing gas serving for the reduction of metal ore

A method for producing a hot CO- and H,-containing reducing gas utilized for the reduction of lumpy metal ore, in particular iron ore, which comprises forming the reducing gas in a gasification zone by the gasification of carbon carriers, in particular coal, taking place in the presence of a supply of oxygen and subsequently cooling the reducing gas down to a reducing-gas temperature favorable to the reduction process, wherein H,O and/or CO,is added to a reducing gas which has been subjectged to a cooling operation that does not effect an addition of H,O/CO,in order to prevent the Boudouard and heterogeneous water-gas reaction and a resultant heating of the reducing gas, wherein the reducing gas is converted to a reducing gas that is thermodynamically more stable at the reducing-gas temperature.

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Micheldorf, Austria

Herbert Mizelli