储存对柴油润滑性的影响

INFLUENCE OF STORAGE ON DIESEL LUBRICITY

采用高频往复试验法(SH/T 0765—2005)对不同来源的市售成品柴油的润滑性进行评价,比较储存前后润滑性的变化。考察了硫含量、多环芳烃含量、酸度和碱性氮化物类型对柴油储存前后润滑性能的影响。实验结果表明:不同柴油储存前后润滑性变化情况不同,凝点低的柴油储存后润滑性变差的几率较大;低硫含量、低芳烃含量的柴油储存前后润滑性差异较大;储存后柴油的酸度增大、缺氢数小的碱性氮化物含量增多是导致柴油润滑性变好的原因;脱除胶质后的柴油润滑性有所降低。

By High Frequency Reciprocating Rig test （HFRR）,the relationship of the changes in lubricating properties of diesel products with sulfur content,polycyclic aromatics content before and after storage were studied.Resins were separated from diesels by solid phase extraction （SPE）,and then studied on their lubricating property.The acidity and the varieties of basic nitrogen compounds in diesels were analyzed before and after storage.The results show that the lubricating properties of diesels with low solidification point is easy to become worse after storage.However,large changes in lubricating properties after storage will appear for the diesels with low content of sulfur and polycyclic aromatic.One reason that leads to the better lubricating property is the increase of acidity and the basic nitrogen compounds with lower hydrogen deficient number （z value） after storage.The lubricating properties of diesels will become worse after resins were separated out.