从各种冶金炉排出的高温烟气往往带走炉子供热量的20～50%。冶金炉烟气和被预热介质的流动方向相反，可较充分地利用烟气余热，达到较高的预热温度，器壁需用耐热材料制成。
... flue gas turbine-expander 烟气透平 flue gas waste heat recovery 烟气余热回收 flue gas 烟道气 ...
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也可以设置烟气余热回收系统来提高加热炉的热效率。
Flue gas can also beset up waste heat recovery system to increase the thermal efficiency of furnace.
一种铁合金电炉烟气余热回收用热管降温器，由内筒体、外筒体 和热管组成；
A ferroalloy electric furnace smoke remaining heat recycling hot tube cooler, is comprised of inner cylinder, outer cylinder and hot tube.
工业炉窑烟气余热回收利用，是提高炉子热效率、节约炉用燃料的极为有效的途径。
Recycle and utilization of waste heat in exhaust fume of industrial furnaces is the efficient way enhancing furnace heat efficiency and saving fuel used by furnace.
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