液化气铜片腐蚀不合格原因分析

针对锦西石化分公司液化气铜片腐蚀不合格现象，对引起液化气腐蚀的物质进行了分析。分析结果表明，硫化氢或元素硫含量高时液化气铜片腐蚀不合格；但对未检出硫化氢的液化气进行铜片腐蚀和带液量分析，发现带液为痕迹量时铜片腐蚀合格，带液量大且色深的液化气腐蚀也不合格，且大多呈点状腐蚀；又分析了与液化气相关液体的腐蚀状况和含硫量以及起泡性能，最终认为锦西石化分公司液化气腐蚀不合格的原因，除了为有时脱硫效果不好之外，还源于液化气携带液体，该携带液中含有S2-，HS ，S2O32-，H2S等硫化物，造成了液化气铜片腐蚀不合格。

CAUSE ANALYSIS OF THE UNQUALIFIED COPPER STRIP CORROSION TEST OF LIQUEFIED PETROLEUM GAS

Due to the unqualified copper strip corrosion test of liquefied petroleum gas (LPG) in Jinxi Petrochemical Company recently, cause analysis was conducted. Results showed that besides high hydrogen sulfide content or high sulfur content in LPG could cause the copper strip test fell, the amount of entrained liquid in LPG played an important role as well. Composition analysis, corrosion test and bubbling function of the entrained liquid and washing water were further investigated. It was found that some sulfur-containing substances, such as S2-，HS ，S2O32-，H2S and etc. in the entrained liquid could induce the unqualified copper strip test of LPG.