USE OF TOP GAS IN DIRECT REDUCTION PROCESSES

摘要

In one aspect, the invention relates to a system for producing direct reduced iron wherein a portion of the top gas from a first module for reducing iron oxide by a direct reduction process is utilized as fuel in the thermal equipment of a second module for reducing iron oxide by a direct reduction process, wherein the second module comprises a process gas heating unit. In various aspects, the thermal equipment of the second module is a reducing gas heater and/or a steam boiler. In a further aspect, the top gas from multiple instances of the first module can be utilized collectively as fuel in the thermal equipment of the second module. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.

主权项

1. An iron oxide-reducing system comprising:
(a) a first module for reducing iron oxide by direct reduction process, the first module comprising a first reducing gas inlet, a first reducing reactor, and a top gas outlet;
wherein the first module, during operation, produces metallic iron and expels a top gas stream via the top gas outlet; and (b) a second module for reducing iron oxide by direct reduction process, the second module comprising a second reducing gas inlet, a second reducing reactor, a reducing gas heater, and a steam boiler, wherein the second module, during operation, produces metallic iron;
wherein the second module comprises a process gas heating unit; andwherein the second module is configured to receive the top gas stream from the first module as a heat-generation gas for the thermal equipment of the second module.