超声破乳-离心分离耦合工艺净化回收炼油厂乳化污油

针对中国石化中科（广东）炼化有限公司的炼厂乳化污油，当采用常规的长时间沉降切水回收后掺炼时，严重影响了常减压装置的安稳运行及其换热网络平衡。在实验基础上，设计出1套超声破乳-离心分离耦合主体工艺、处理量为400 L/h的乳化污油净化回收中试装置。运行结果表明:该装置连续稳定运行37 d，共处理炼厂高度乳化的清罐污油110 t，得到净化油72 t，乳化污油油料回收率为98.0%~98.4%；所得净化油的含水质量分数均小于0.1%，含盐质量浓度不超过15 mg/L，灰分低于0.04%，均达到净化油品质相应指标要求，净化油与蒸馏水的混合液无再次乳化现象发生，实现了乳化污油高品质回收。

Purification and recovery of emulsified waste oil by ultrasonic demulsification- centrifugal separation coupling process in refinery

The stable operation and the heat exchange network balance of the atmospheric and vacuum distillation unit were seriously affected，when using conventional long term sedimentation and cutting water recovery for the emulsified oil in the Zhongke（Guangdong） Refinery Plant， SINOPEC. Therefore，on the basis of the experiment，a pilot unit for purifying and recovering the emulsified dirty oil was worked out with the processing capacity of 400 L/h by applying a set of ultrasonic demulsification-centrifugal separation coupling main process. The results showed that this unit operated steadily for continuous 37 d，along with a total of 110 t highly emulsified cleaning tank waste oil of refinery was treated，and 72 t of purified oil was obtained，the recovery rate of the emulsified oil was 98.0%-98.4%. Moreover，not only the mass fraction of the water in the purified oil was less than 0.1%，the mass concentration of salt did not exceed 15 mg/L，and the ash content was less than 0.04%，i.e. the quality of the purified oil met the corresponding requirements，but also the high-quality recovery of the emulsified waste oil was achieved，due to the mixture of purified oil and distilled water would not emulsify again.