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一、问题的提出上海石化总厂化工二厂从日本引进的醋酸装置的精馏塔有许多大型密封面,由于长期运行在较高温度的腐蚀介质中(醋酸97%,温度在100～130℃),存在着不同程度的局部腐蚀(缝隙腐蚀),有的已引起介质严重泄漏(如D—251人孔密封面),威胁安全稳定生产,迫切需要解决.过去几年中,为了解决这个问题,在总厂范围内曾开展过一些这方面的工作.采用粘结,金属、非金属镶嵌,涂料涂覆等试验,均未奏效.也曾采用简易法兰密封面刨削装置在现场将腐蚀面进行刨削去后使
First, the issue raised Shanghai Petrochemical Plant Chemical Plant imported from Japan acetic acid plant distillation tower has many large sealing surface, due to the long-term operation in the higher temperature of the corrosive medium (acetic acid 97%, the temperature at 100 ~ 130 ℃ ), There are different degrees of local corrosion (crevice corrosion), and some have caused serious media leakage (such as D-251 manhole sealing surface), threatening the safe and stable production, an urgent need to address the past few years, in order to solve this problem , Has carried out some work in this area within the scope of the plant.It has not worked with the test of bonding, metal, non-metallic inlaid, paint coating, etc. Also used simple flange face planing device in the field corrosion After shaving the surface to make