| 摘要 |
“A method for producing direct reduced iron in a vertical reactor having an upper reducing zone and a lower cooling zone, the method including: feeding iron oxide feed material to an upper portion of the vertical reactor, the iron oxide feed material forming a burden flowing by gravity to a material outlet portion in a lower portion of the vertical reactor; feeding hot reducing gas to a lower portion of the reducing zone of the vertical reactor, the hot reducing gas flowing in a counter flow to the burden towards a gas outlet port in the upper portion of the vertical reactor; recovering direct reduced iron at the lower portion of the vertical reactor; recovering top gas at the upper portion of the vertical reactor; submitting at least a portion of the recovered top gas to a recycling process; and feeding the recycled top gas back into the vertical reactor, where the recycling process includes heating the recovered top gas in a preheating unit before feeding it to a reformer unit; feeding volatile carbon containing material to the reformer unit and allowing the volatile carbon containing material to devolatise and to react with the recovered top gas; feeding desulfurizing agent into the recovered top gas in or upstream of the reformer unit; heating the reformer unit; and feeding the reformed top gas recovered from the reformer unit through a particle separation device for removal of sulfur containing material.” |
