公开(公告)号：EP2794932A2

公开(公告)日：2014-10-29

申请号：EP12848748.5

申请日：2012-12-21

申请人： HYL Technologies, S.A. de C.V. ,  Danieli & C. Officine Meccaniche SpA

发明人： MARTINIS, Alessandro ,  BECERRA-NOVOA, Jorge-octavio ,  CONDOSTA, Michele ,  ZENDEJAS-MARTINEZ, Eugenio

IPC分类号： C21B13/00 ,  C21B13/02 ,  C10K1/00 ,  C01B3/36 ,  C10B43/10 ,  C10G9/16 ,  F27D25/00

CPC分类号： C21B13/0073 ,  C01B2203/0227 ,  C01B2203/025 ,  C10G9/16 ,  C10G75/00 ,  C21B13/02 ,  C21B13/029 ,  C21B2100/66 ,  F27D25/00 ,  F27D25/008 ,  Y02P10/122 ,  Y02P10/126 ,  Y02P10/128 ,  Y02P10/136 ,  Y02P10/265 ,  Y02P10/283

摘要： 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.

摘要翻译： 直接还原过程和工厂用于生产DRI包括还原反应器和至少一种还原气体加热器一般包括一个对流加热段和用于提高还原气的温度，以足够的铁的氧化物还原成金属铁的水平的辐射加热段，典型地高于 850℃，进料worin到还原反应器的还原气体包括从所述还原反应器和其可形成的碳沉积物在所述加热器的加热路径焦炉气的含碳化合物的补充流再循环还原气体的流 即BTX和其它复杂的碳化合物。 加热器被用于按预定的加热管连续供给氧化剂，例如蒸汽，蒸汽和空气和/或氧气用于消除碳沉积物可形成所述加热器的加热管内，而不会中断的计划手术的装置。 冷COG的补充料流可以与再循环气体在加热器的气体加热通路，其中管具有壁皮肤温度至少700℃，或者当再循环气体的混合物和一个点相结合 COG是在高于700℃的温度下最小化堵塞或加热设备结垢。