Method for increasing the capacity of a direct reduced iron plant without increasing its reformer capacity
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United States of America Patent
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Feb 6, 2001
Grant Date -
N/A
app pub date -
Oct 16, 1998
filing date -
Oct 16, 1998
priority date (Note) -
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Abstract
A method and apparatus for increasing the productivity of an existing direct reduction iron (DRI) plant without increasing its reformer capacity existing in the plant. This object is achieved by not only recycling some effluent gas of the reduction reactor to the gas reformer (with natural gas or the like added with an oxidant as make up gas), but also recycling an additional portion of the effluent gas with added natural gas and an oxygen containing stream directly to the reducing gas stream exiting the reformer prior to or as part of its introduction to the reduction reactor, thereby providing additional reducing agents and increasing the reducing capacity of the plant. The oxygen containing stream is preferably added to the recycled reducing gas without preheating. Any excess or purged effluent gas is as usual burned as fuel.
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