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利用烟气余热预热空气(煤气)的换热器是回收烟气余热行之有效的节能措施。应用换热器后一般燃料节约率可达10％至25％。1981年我厂与北京钢铁设计研究总院共同消化移植了长钢、武钢由日本进口的金属片状预热器。这种预热器传热效率高、气密性好,且采用了波形膨胀器,使用寿命较长。设计金属片状预热器必须考虑燃料节省、运行安全、投资费用回收快等因素。金属片状预热器的翅片管材质如表1。
The use of flue gas waste heat to preheat the air (gas) heat exchanger is an effective energy saving measures to recover flue gas waste heat. After the application of heat exchanger fuel savings rate of up to 10% to 25%. In 1981, our factory and Beijing Iron & Steel Design and Research Institute jointly digested and transplanted Changxing Steel and WISCO imported sheet metal preheaters from Japan. This preheater heat transfer efficiency, air tightness, and the use of wave expander, longer service life. Design sheet metal preheater must consider fuel savings, operational safety, investment costs and other factors quickly recovery. Sheet metal preheater fin tube material in Table 1.