空气预热器是碳黑工程设备，其结构复杂，壳体带有两个双锥导流体和一组三波形膨胀器，制造加工难度大。换热器结构复杂采用体外穿管及合理装焊工艺。由于该设备有特殊折边封头锥体，为此采用“多用可变内环胎模折边成型”六种8件折边锥形体；对于多波形膨胀器制造，则采用热煨管切割展开内外环对接法成型技术。% Air preheater belongs to the black carbon engineering device .The preheater has complicated structure , and its body consists of two bicone diversion body and a set of three wave form expander .The manufacturing and pro-cessing is very difficult, technologies of tube circling outside the core and reasonable assembly welding are adopted . Regarding to this type device has a special fold side seal head cone , 6 types and 8 pieces fold side cone-shaped body was processed by fold side and mould method of multifunction variable inner ring tube mould , furthermore, for multi-wave form expander manufacturing , the mould technique of machine cutting and expanding heating tube and butt weld -ing of inner ring and outer ring was carried out .
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