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    • 5. 发明申请
    • METHOD AND APPARATUS FOR PRODUCTION OF DIRECT REDUCED IRON (DRI) UTILIZING COKE OVEN GAS
    • 直接还原铁(DRI)生产焦炉烤炉的方法和装置
    • US20150184264A1
    • 2015-07-02
    • US14368258
    • 2012-12-21
    • HYL TECHNOLOGIES, S.A. DE C.V.DANIELI & C. OFFICINE MECCANICHE, S.p.A.
    • Alessandro MartinisJorge-Octavio Becerra-NovoaMichele CondostaEugenio Zendejas-Martinez
    • C21B13/00F27D25/00
    • C21B13/0073C01B2203/0227C01B2203/025C10G9/16C10G75/00C21B13/02C21B13/029C21B2100/66F27D25/00F27D25/008Y02P10/122Y02P10/126Y02P10/128Y02P10/136Y02P10/265Y02P10/283
    • Direct reduction process and plant for producing DRI comprising a reduction reactor and at least one reducing gas heater typically comprising a convective heating section and a radiant heating section for raising the reducing gas temperature to a level adequate for iron oxides reduction to metallic iron, typically above 850° C., wherein the reducing gas fed to the reduction reactor comprises a stream of reducing gas recycled from the reduction reactor and a make-up stream of coke oven gas containing carbon compounds which may form carbon deposits in the heating path of said heater, namely BTX and other complex carbon compounds. The heater is provided with means for feeding oxidizing agents, for example steam, steam and air and/or oxygen at predetermined heating tubes successively for eliminating the carbon deposits which may form inside the heating tubes of said heater without interrupting the operation of the plant. The make-up stream of cold COG can be combined with the recycled gas at a point in the gas heating path of the heater where the tubes have a skin wall temperature of at least 700° C., or when the mixture of recycled gas and COG is at a temperature above 700° C. for minimizing clogging or fouling of heating equipment.
    • 直接还原方法和用于生产DRI的装置,包括还原反应器和至少一个还原气体加热器,通常包括对流加热段和辐射加热段,用于将还原气体温度升高至铁氧化物还原为金属铁的水平,通常在 其中进料到还原反应器的还原气体包括从还原反应器再循环的还原气流,以及含有碳化合物的焦化炉气补充流,所述碳化合物可在所述加热器的加热路径中形成碳沉积物 ,即BTX等复合碳化合物。 加热器设有用于连续地在预定加热管上供给氧化剂,例如蒸汽,蒸汽和空气和/或氧气的装置,以消除可能在所述加热器的加热管内部形成的碳沉积物而不中断工厂的操作。 冷COG的补充流可以在加热器的气体加热路径中的一点处与循环气体组合,其中管的表面壁温度至少为700℃,或者当再循环气体和 COG的温度高于700°C,以减少加热设备的堵塞或结垢。