板式换热器垢底部位污垢形成的主要成因：
Main causes of fouling formation in fouling at plate bottom of plate heat exchanger:
（1）不锈钢传热板片由机械冲压而成，不可避免地残存一定量的表面残余应力，对于不含钼元素的不锈钢薄板，表面残余应力的消除是很困难的，或者甚至是不可行的。
(1) stainless steel heat transfer plate is composed of a mechanical stamping, inevitably a certain amount of residual surface residual stress, the stainless steel sheet does not contain molybdenum, eliminate the surface residual stress is very difficult, or even impossible.
（2）板片组装后形成了多缝隙结构，如板片之间的触点、密封槽底等部位。而缝隙容易造成Cl-的富集，局部富集程度往往远远超过了不锈钢自身抗应力腐蚀的能力。
(2) a multi slit structure is formed after the plate is assembled, such as the contact between the plate and the plate and the bottom of the sealing groove. But the crevice is easy to cause the Cl- enrichment, the local enrichment degree is often far more than the stainless steel itself stress corrosion resistance ability.
（3）当板片表面的污垢严重时，介 中的腐蚀元素（Cl、S 等）可能大量附着于污垢，并在垢底缝隙处富集。
(3) when the dirt on the surface of the plate is serious, the corrosion elements (Cl, S, etc.) in the medium may be heavily attached to the dirt and enriched at the crevice at the bottom of the fouling.
（4）密封槽底中的有害元素往往是粘结剂中的 Cl 因温度升高温析出来的。如氯丁 胶系列的粘接剂、压缩石棉（含有CaCl2）,往往在水与蒸汽工况条件下，析出的富集Cl- 与 H+ 形成HCl,使槽底缝隙处发生严重的应力腐蚀开裂。
(4) the harmful elements in the bottom of the sealing tank are often the temperature of Cl in the binder. Such as neoprene series of adhesives, compressed asbestos (containing CaCl2), often in the water and steam conditions, precipitation enrichment, Cl- and H+ formation of HCl, so that the gap at the bottom of the groove there is a serious stress corrosion cracking.
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