Method and apparatus for reducing a feed material in a rotary hearth furnace

一种用来还原送进物料的回转炉床炉。该回转炉床炉(10)包括一个布置在围墙内并安装成用来回转运动的回转炉床(12)。该围墙包括环形内墙(14)、环形外墙(16)和顶棚(18)。围墙密封于炉床并分成许多区，其中至少包括装料区(28)、加工区(24)和出料区(22)。该炉子还包括一组至少布置在围墙外墙用以在回转炉床炉内提供受控温度的燃烧器(20)和一个布置在预热区(26)与出料区(22)之间的炉子的还原区内以便排放来自燃烧器的燃烧气体和由对送进物料的加工生成的气体的烟道(30)。所述烟道包含用来燃烧和沉降未燃烧颗粒的空间。喷水骤冷降低炉子尾气的温度以便通过引进空气或氧气的后续燃烧不生成很多的氮氧化物。 A rotary hearth furnace for reducing a feed material. The rotary hearth furnace (10) includes a rotating hearth (12) disposed in an enclosure and mounted for rotary movement. The enclosure includes an annular inner wall (14), an annular outer wall (16) and a roof (18). The enclosure is sealed to the hearth and divided into a plurality of zones including at least a loading zone (28), a process zone (24) and a discharge zone (22). The furnace further includes a plurality of burners (20) positioned in at least the outer wall of the enclosure to provide a controlled temperature within the rotary hearth furnace and a flue (30) positioned within the reduction zone of the furnace between the preheat zone (26) and the discharge zone (22) to exhaust combustion gases from the burners and gases resulting from the processing of the feed material. Said flue contains space for combustion and settling of the unburned particulates. A water spray quench reduces the temperature of the furnace off-gas so that subsequent combustion by the introduction of air or oxygen does not produce significant nitrogen oxides.