Abstract Demulsification is usually a necessary step for the treatment of oily sludge, which is also an important and urgent task in the petroleum industry. Since the inefficient and difficult demulsification for the refinery oily sludge by traditional methods, a new method using microwave irradiation to strengthen the demulsification efficiency was proposed in this work. A series of demulsification runs were carried out to investigate the effects of microwave heating temperature and power, upon the droplet-size distribution and the total demulsification efficiency of oily sludge. The demulsification process of the oily sludge heated by microwave irradiation and water bath were compared in terms of demulsification efficiency, demulsification temperature, demulsification time and centrifugal speed. At the same time, characterization tests were performed by viscometer, DSC analyzer, Zeta potentiometer, etc. Results showed that the demulsification temperature of the oily sludge should be kept below 77 °C. The demulsification efficiency of oily sludge increased first and then decreased with the increase of microwave heating temperature and power, which reached maximum (67.4%) at 55 °C, with the microwave power of 700 W. Compared with conventional heating (55 °C), the demulsification efficiency of oily sludge increased by 25.3% under microwave irradiation (700 W, 55 °C). Besides, microwave irradiation can simultaneously reduce the demulsification temperature (>40 °C), the demulsification time (>95%), and the centrifugal speed (~36.7%), which proves that microwave demulsification is a rapid, high-efficiency, low consumption demulsification method.

中文翻译：

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微波辐照强化炼油厂含油污泥破乳研究

摘要 破乳通常是含油污泥处理的必要步骤，也是石油工业中一项重要而紧迫的任务。针对炼油厂含油污泥传统方法破乳效率低下、破乳困难的问题，本文提出了一种利用微波辐照增强破乳效率的新方法。进行了一系列破乳运行以研究微波加热温度和功率对液滴尺寸分布和含油污泥总破乳效率的影响。从破乳效率、破乳温度、破乳时间和离心速度等方面比较了微波辐照和水浴加热含油污泥的破乳过程。同时，通过粘度计、DSC分析仪、Zeta电位计等进行表征测试，结果表明含油污泥的破乳温度应保持在77℃以下。含油污泥的破乳效率随着微波加热温度和功率的增加先升高后降低，在55℃时达到最大值（67.4%），微波功率为700W。 与常规加热（55℃）相比，微波辐照（700 W，55℃）下含油污泥的破乳效率提高了25.3%。此外，微波辐照可同时降低破乳温度（>40℃）、破乳时间（>95%）和离心速度（~36.7%），证明微波破乳是一种快速、高效、低消耗破乳法。