| 简介 |
(57) Abstract : The present invention concerns a method and an apparatus for producing DRI (Direct Reduced Iron) utilizing a high-oxidation reducing gas containing carbon monoxide and hydrogen, derived directly or indirectly from the gasification of hy- drocarbons or coal, with a high content of oxidants (H20 and CO2). The invention provides a more efficient method and plant comprising a reactor in which particulate material of iron ore comes into contact with a high temperature reducing gas to produce DRI, with lower investment and operating costs, avoiding the need for a fired heater for the reducing gas fed into the reduction re- actor. The reducing gas is heated to a temperature above 700°C in two steps, a first step at a temperature below about 400°C to prevent the phenomenon of metal dusting, by exchange of sensible heat supplied by the stream of hot spent gas removed from the reduction reactor; and a second step by means of partial or total combustion with oxygen, maintaining the temperature of the com- II Ill Published : -- with international search report (Art. 21 (3)) before the expiration of the time limit for amending claims and to be republished in the event of receipt amendments (Rule 48.2(h)) |
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