流速和硫含量对原油中环烷酸腐蚀性的影响

 设计了一种现场腐蚀旁路试验方法，该方法不仅可以直接研究实际生产原油中环烷酸对材质的腐蚀性，还可以实现变流速试验。采用该装置研究了原油流速和硫含量对其中环烷酸腐蚀性的影响规律。结果表明，在试验条件下，随原油流速的增加，10#碳钢和Cr5Mo的腐蚀速率均成线性增大，321不锈钢的腐蚀速率基本不变；在各个流速情况下321不锈钢的耐腐蚀性最优，Cr5Mo其次，10#碳钢最差。在硫质量分数不大于0.86％时，硫含量对原油中环烷酸腐蚀性的影响较小；当原油中硫质量分数大于0.86％时，随着硫含量的增加，10#碳钢和Cr5Mo的腐蚀速率显著减小， 321不锈钢的腐蚀速率均很小；在各个硫含量情况下321不锈钢的耐腐蚀性最优，Cr5Mo其次， 10#碳钢最差。

EFFECT OF VELOCITY AND SULFUR CONTENT OF CRUDE OIL ON THE CORROSION BEHAVIOR OF NAPHTHENIC ACID

A bypass test of corrosion used for investigation of the corrosion behavior of naphthenic acid in crude oil under different velocity was designed. Effects of velocity and sulfur content of crude oil on the corrosion rate of three different materials were investigated. The results showed that under the experimental conditions, the corrosion rates of 10# carbon steel and Cr5Mo increased with the increasing of the velocity, while the corrosion rate of 321 stainless steel was slight changed. At the same velocity of crude oil, the 321 stainless steel showed the best corrosion resistance, 10# carbon steel the worst among the three materials. The sulfur mass fraction of crude oil below 0.86% showed slight effect on the corrosion of 10# carbon steel and Cr5Mo. At the sulfur mass fraction of above 0.86%, the corrosion rate of 10# carbon steel and Cr5Mo decreased distinctly with the increasing of sulfur content, the corrosion rate of 321 stainless steel was slight affected. At the same sulfur content, the 321 stainless steel showed the best corrosion resistance, 10# carbon steel the worst among the three materials.