发明授权
EP1340822B1 METHOD FOR OPERATING ROTARY HEARTH TYPE REDUCING FURNACE AND ROTARY HEARTH TYPE REDUCING FURNACE FACILITIES
有权
运行方法用于车削COOKER还原炉转底炉还原和DEVICES
- 专利标题: METHOD FOR OPERATING ROTARY HEARTH TYPE REDUCING FURNACE AND ROTARY HEARTH TYPE REDUCING FURNACE FACILITIES
- 专利标题(中): 运行方法用于车削COOKER还原炉转底炉还原和DEVICES
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申请号: EP01982753.4申请日: 2001-11-09
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公开(公告)号: EP1340822B1公开(公告)日: 2008-01-16
- 发明人: IBARAKI, Tetuharu , ODA, Hiroshi , TAKAHASHI, Masaharu
- 申请人: Nippon Steel Corporation
- 申请人地址: 6-3, Ohtemachi-2-chome Chiyoda-ku Tokyo 100-8071 JP
- 专利权人: Nippon Steel Corporation
- 当前专利权人: Nippon Steel Corporation
- 当前专利权人地址: 6-3, Ohtemachi-2-chome Chiyoda-ku Tokyo 100-8071 JP
- 代理机构: Vossius & Partner
- 优先权: JP2000342800 20001110; JP2001269797 20010906; JP2001279055 20010914
- 国际公布: WO2002038815 20020516
- 主分类号: C21B13/10
- IPC分类号: C21B13/10 ; C21B11/08 ; F27D17/00 ; C22B1/16 ; C21B13/08
摘要:
A method of operating a rotary hearth type reducing furnace, characterized in that a combustion gas generated in the furnace is held in a state, wherein the temperature of the gas is 800 DEG C or higher, the concentration of carbon monoxide is 2000 ppm by volume or less and turbulent flow is satisfactorily developed, for a period of a predetermined time or more, in at least one of the inside of an exhaust gas exit duct and the vicinity of the exhaust gas exit duct, and then is cooled rapidly; and rotary hearth type reducing furnace facilities required for the practice of the method of operation. The operating method allows the suppression of generation of dioxins in a combustion exhaust gas and also the efficient recovery of heat from the combustion exhaust gas having an elevated temperature, in a process of firing and reducing pellets or the like formed from a ore powder such as a chromium ore or iron ore powder, or a dust, a sludge or the like containing an oxidized metal such as iron oxide generated in the metal industry in a rotary hearth type reducing furnace, and also allows the total mole number of zinc and lead, the total mole number of alkali metals, and the total mole number of halogen elements contained in a dust in the combustion exhaust gas to be controlled so that the three numbers satisfy a specific relationship.
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