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AssigneesVoest-Alpine Industrieanlagenbau GmbH, Brifer International Ltd.
InventorsGerhard Cip, Gottfried Rossmann, Konstantin Milionis, Roy Hubert Whipp, Jr.
Estimating the term…
With a process for the direct reduction of particulate iron-containing material by fluidization, reformed gas, at least partially freed from CO.sub.2, is supplied to a fluidized-bed reduction zone as a reducing gas and is carried off from the same as a top gas and at least a portion of the top gas together with reformed gas is utilized for direction reduction. To economize on parts of the plant that are impinged on by reducing gas and in order to achieve savings in terms of heating costs, CH.sub.4 and N.sub.2 are, in addition to CO.sub.2, at least partially removed by adsorption, from 50 to 100% of the reformed as and 0 to 100% of the top gas, and the tail gas removed from the reformed gas and/or the top gas by adsorption is utilized as a heating gas.
A process for the direct reduction of particulate iron-containing material by fluidization in which a reformed gas which has been at least partially freed from CO.sub.2 is supplied to a fluidized bed reduction zone as a reducing gas and is removed from the fluidized bed reduction zone as a top gas and in which at least a portion of the top gas together with the reformed gas is utilized for direct reduction characterized in that methane and nitrogen are, in addition to CO.sub.2, at least partially removed by adsorption from 50% to 100% of the reformed gas and 0% to 100% of the top gas and the reducing gas is heated after the adsorptive removal and in which a tail gas removed from the reformed gas or the top gas or both by adsorption is used as a heating gas.
A process according to claim 13, characterized in that the tail gas is utilized to heat the reducing gas or as a heating gas for the reforming process carried out to produce the reformed gas, or both.
A plant for the direct reduction of particulate iron-containing material by fluidization comprising at least one fluidized bed reactor having a gas inlet and a gas outlet, a first gas circulation system connected to said gas inlet and said gas outlet to permit gas to flow through said reactor in a first direction and comprising a gas source, a gas reformer, a carbon dioxide adsorber and a first heater connected in said first gas circulation system, a second gas circulation system comprising said gas outlet, said carbon dioxide absorber and said gas inlet, and wherein said absorber includes a discharge duct for a combustible tail gas separated in said adsorber.
Dependencies are inferred from the claim text.