基于MEE-TVC系统的油田污水脱盐净化处理实验研究

Experimental Study on Oilfield Wastewater Desalination Based on Multi-effect Evaporation with Thermal Vapor Compression System

针对油田污水高矿化度的特点,利用500 kg/h低温多效蒸发(LT-MEE)实验平台,分别采用淡水、Na Cl溶液、高盐度模拟油田污水和大庆油田污水进行了深度脱盐净化实验研究,对产品水质进行化学分析。为提高热经济性,进行了多效蒸发(MEE)和热蒸汽压缩器(TVC)耦合系统(MEE-TVC)的实验研究,考察了不同进料流量、温度和浓度对系统性能和产品水质的影响。结果表明:MEE-TVC系统的造水比(GOR)随着TVC引射位置的后移先增大后减小;相对于MEE系统,MEE-TVC系统的造水比提高约32.4%;造水比与处理量间存在优化匹配关系;进料温度的升高有助于提高造水比;造水比对进料液盐度不敏感,说明系统对高矿化度、高盐度的油田污水适应性较好;处理之后的产品水质均已达到锅炉水质标准。

In view of the high mineral content of oilfield wastewater and using the LT-MEE experimental platform of 500 kg/h,fresh water,Na Cl solution,simulated oilfield wastewater with high salinity and real wastewater of Da Qing Oilfield are used respectively to conduct in-depth experimental study of desalination to do chemical analysis of the product water quality.In order to improve the thermal economy,the experimental study of MEE-TVC coupled system is conducted,and the influence of feed flow rate,temperature and concentration on the product performance and water quality is studied.The results indicate that the GOR of MEE-TVC system increases firstly and then decreases with the backward movement of the ejector location; compared with MEE system, the GOR of MEETVC system is 32.4% higher; there is a optimal matching relationship between GOR and treatment amount; the increase of feed temperature can help to improve GOR; GOR is insensitive to the feed salinity,which means that the system has a good adaptability to the oilfield wastewater with high salinity and mineralization; the treated water quality of the product has reached the standard of boiler water.