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101 条记录 (耗时 0.011 秒)

    Direct reduction process utilizing hydrogen
    17.
    发明授权
    Direct reduction process utilizing hydrogen 有权

    公开(公告)号：US11952638B2

    公开(公告)日：2024-04-09

    申请号：US17029778

    申请日：2020-09-23

    申请人： Midrex Technologies, Inc.

    发明人： Keith Marshall Bastow-Cox ,  Enrique Jose Cintron ,  Gregory Darel Hughes

    IPC分类号： C21B13/00 ,  C21B11/02 ,  C21B13/02

    CPC分类号： C21B13/0073 ,  C21B11/02 ,  C21B13/02 ,  C21B2100/22 ,  C21B2100/44 ,  C21C2200/00

    摘要： A direct reduction method/system, including: adding variable amounts of natural gas, hydrogen, and a carbon-free oxidizing gas to a feed gas stream upstream of a reformer; reforming the feed gas stream in the reformer to form a reformed gas stream, and delivering the reformed gas stream to a shaft furnace, where the reformed gas stream is used to reduce a metallic ore material to a direct reduced metallic material. The feed gas stream includes a top gas stream recycled from the shaft furnace. Optionally, the carbon-free oxidizing gas includes steam and the method further includes controlling a steam flow rate of the steam to maintain a maximum k-factor value of the feed gas stream of 0.74 or lower. Optionally, the variable amount of hydrogen is selected to replace 20-90% of the natural gas by fuel value. The variable amount of hydrogen is selected based upon an available supply of hydrogen.

    Metallurgical furnace
    19.
    发明授权
    Metallurgical furnace 有权

    公开(公告)号：US09951992B2

    公开(公告)日：2018-04-24

    申请号：US15107781

    申请日：2014-12-22

    申请人： Tecnored Desenvolvimento Tecnologico S.A.

    发明人： Hermes Joaquim Ferreira Filho ,  Kleiton Gonçalves Lovati

    IPC分类号： F27D7/02 ,  F27B1/16 ,  F27B1/02 ,  F27B1/10 ,  C21B11/02 ,  C21B7/16 ,  F27D99/00 ,  C21C5/56

    CPC分类号： F27B1/16 ,  C21B7/16 ,  C21B11/02 ,  C21C5/56 ,  F27B1/02 ,  F27B1/10 ,  F27D7/02 ,  F27D99/0033 ,  Y02P10/136

    摘要： The present invention pertains to metallurgical processes and equipment and, more particularly, to a metallurgical furnace capable of operating with a broad range of broad range of raw materials and fuels, including those with high levels of impurities. Accordingly, the metallurgical furnace of the present invention comprises (i) at least an upper tub, (ii) at least a lower tub, (iii) at least a fuel feeder positioned substantially between the at least an upper tub and the at least a lower tub, (iv) at least a row of tuyeres positioned on at least one of at least an upper tub and at least a lower tub, the at least a row of tuyeres fluidly communicating inside the furnace with the outside environment, and (v) at least a burner positioned on at least one of at least an upper tub and at least a lower tub. The use of at least a burner jointly with the at least a row of tuyeres generates a very intense release of heat by virtue of the exothermic reactions which occur by this combination.

    PROCESS FOR DIRECT REDUCTION OF IRON OXIDE
    20.
    发明申请
    PROCESS FOR DIRECT REDUCTION OF IRON OXIDE 有权
    直接还原氧化铁的方法

    公开(公告)号：US20140150607A1

    公开(公告)日：2014-06-05

    申请号：US14235277

    申请日：2012-07-16

    申请人： Iakov M. Gordon

    发明人： Iakov M. Gordon

    IPC分类号： C21B13/02

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

    摘要： 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.

    摘要翻译： 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。