发明公开
EP2794932A2 METHOD AND APPARATUS FOR PRODUCTION OF DIRECT REDUCED IRON (DRI) UTILIZING COKE OVEN GAS
审中-公开
对任何直接的制造方法和设备还原铁使用焦炉煤气
- 专利标题: METHOD AND APPARATUS FOR PRODUCTION OF DIRECT REDUCED IRON (DRI) UTILIZING COKE OVEN GAS
- 专利标题(中): 对任何直接的制造方法和设备还原铁使用焦炉煤气
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申请号: EP12848748.5申请日: 2012-12-21
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公开(公告)号: EP2794932A2公开(公告)日: 2014-10-29
- 发明人: MARTINIS, Alessandro , BECERRA-NOVOA, Jorge-octavio , CONDOSTA, Michele , ZENDEJAS-MARTINEZ, Eugenio
- 申请人: HYL Technologies, S.A. de C.V. , Danieli & C. Officine Meccaniche SpA
- 申请人地址: Av. Munich 101 Colonia Cuauhtémoc 66452 San Nicolás De Los Garza, N.L. MX
- 专利权人: HYL Technologies, S.A. de C.V.,Danieli & C. Officine Meccaniche SpA
- 当前专利权人: HYL Technologies, S.A. de C.V.,Danieli & C. Officine Meccaniche SpA
- 当前专利权人地址: Av. Munich 101 Colonia Cuauhtémoc 66452 San Nicolás De Los Garza, N.L. MX
- 代理机构: HOFFMANN EITLE
- 优先权: US201161578877P 20111221
- 国际公布: WO2013093640 20130627
- 主分类号: C21B13/00
- IPC分类号: C21B13/00 ; C21B13/02 ; C10K1/00 ; C01B3/36 ; C10B43/10 ; C10G9/16 ; F27D25/00
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.
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