公开(公告)号：WO2013013295A1

公开(公告)日：2013-01-31

申请号：PCT/CA2012/000678

申请日：2012-07-16

Applicant: HATCH LTD. ,  GORDON, Iakov M.

Inventor： GORDON, Iakov M.

IPC: C21B13/02 ,  C21B11/02

CPC classification number: C21B13/02 ,  C21B11/02 ,  C21B13/004 ,  C21B13/0073 ,  C21B2100/02 ,  C21B2100/04 ,  C21B2100/282 ,  Y02P10/122 ,  Y02P10/128 ,  Y02P10/136

Abstract: A process for direct reduction of iron oxide in a shaft furnace. The furnace has a pre-reduction zone near its uppermost portion, a metallization zone below the pre-reduction zone, an intermediate zone which separates the pre-reduction zone from the metallization zone and which includes a restriction to inhibit rich fuel gas from passing from the pre-reduction zone to the metallization zone, and a cooling zone below the metallization zone at the lowest portion of the furnace. The process includes feeding iron oxide to the furnace, passing the iron oxide successively downwardly through the pre-reduction zone, the transition zone, the metallization zone, and the cooling zone while passing rich fuel gas produced by external partial combustion with a sub-stoichiometric volume of air upwardly through the pre-reduction zone in counter-current flow so as to partially reduce the iron oxide, and passing reducing gas downwardly through the metallization zone in co-current flow so as to substantially complete the reduction of the iron oxide to metallic iron. The reducing gas is first pre-heated in a gas heater and then subjected to partial combustion with oxygen to further increase its temperature. The process includes removing a metallized iron product from the cooling zone.

Abstract translation: 在竖炉中直接还原氧化铁的方法。 该炉具有在其最上部附近的预还原区，在预还原区下方的金属化区，将预还原区与金属化区隔开的中间区，其包括抑制富燃燃料从 到金属化区的预还原区，以及在炉的最低部分处的金属化区下方的冷却区。 该方法包括向炉中加入氧化铁，使铁氧化物连续向下通过预还原区，过渡区，金属化区和冷却区，同时通过外部部分燃烧产生的富燃料气体以亚化学计量 空气的体积向上通过预还原区域以逆流流动，以便部分地还原氧化铁，并且使还原气体以并流流动向下通过金属化区域，以便基本上完成氧化铁的还原 金属铁。 还原气体首先在气体加热器中预热，然后用氧进行部分燃烧，以进一步提高其温度。 该方法包括从冷却区去除金属化的铁产品。