摘要
输变电设备的可靠运行影响着电网的安全和稳定。对油纸绝缘设备的老化诊断是输变电设备在线监测和诊断的关键技术之一,糠醛作为评估油纸绝缘设备老化状态的重要特征物,需要对其进行准确地检测。基于拉曼效应的拉曼光谱法可以快速、准确地进行油中溶解老化特征物的检测。那么提升油中溶解糠醛拉曼检测的灵敏度就具有重要的意义。本文结合萃取技术采用去离子水作为萃取剂对油中糠醛进行萃取和拉曼光谱检测,在相同实验条件下与甲醇作为萃取剂进行对比,找到了糠醛分子的特征拉曼峰1371cm^-1,在等浓度梯度上进行拉曼光谱的对比,分别得到了其最小检测样品浓度为1.38mg/L和2.75 mg/L,并进行了可重复性检测。对比结果表明:基于去离子水作为萃取剂的油中糠醛分子的拉曼光谱检测相比于甲醇作为萃取剂具有更低的检测下限和可重复性,而且萃取剂自身拉曼干扰更小,为油中糠醛含量的快速、无损检测做出了贡献。
The reliable operation of power transmission and transformation equipment affects the safety and stability of the power grid.The aging diagnosis of oil-paper insulation equipment is one of the key technologies for on-line monitoring and diagnosis of power transmission and transformation equipment.As an important feature for evaluating the aging state of oil-paper insulation equipment,furfural needs to be accurately detected.Raman spectroscopy based on Raman effect can quickly and accurately detect the dissolved aging characteristics in oil.It is therefore important to increase the sensitivity of the Raman detection of dissolved furfural in oil.In this paper,deionized water was used as extractant to extract and Raman spectroscopy of furfural in oil.Under the same experimental conditions,methanol was used as extractant to find the characteristic Raman peak of the furfural molecule of 1371 cm^-1.The Raman spectra were compared on a certain concentration gradient,and the minimum test sample concentrations were 1.38 mg/L and 2.75 mg/L,respectively,and the repeatability test was performed.The comparison results show that the Raman spectroscopy of furfural molecules in oil based on deionized water as extractant has lower detection limit and repeatability than methanol as extractant,which has contributed to the rapid and non-destructive test of furfural content in oil.
作者
乔胜亚
陈莎莎
熊俊
杨森
张宇
QIAO Shengya;CHEN Shasha;XIONG Jun;YANG Sen;ZHANG Yu(Guangzhou Power Supply Bureau Co., Ltd., Guangdong 510600, China)
出处
《光散射学报》
2020年第2期136-141,共6页
The Journal of Light Scattering
基金
中国南方电网有限责任公司科技项目(GZHKJXM20170062)资助。
关键词
去离子水
甲醇
糠醛
萃取
拉曼光谱
Deionized water
methanol
furfural
extraction
Raman spectroscopy
