Novel purification of oily process water from ethylene production at pilot scale
Novel purification of oily process water from ethylene production at pilot scale
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DOI：
10.1016/j.jwpe.2023.103548
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发表时间：
2023-04
影响因子：
7
通讯作者：
Qilong Liu;Haijun Li;Huatong Zhu;Silong Feng;Qiang Yang;Hao Lu
中科院分区：
文献类型：
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作者：
Qilong Liu;Haijun Li;Huatong Zhu;Silong Feng;Qiang Yang;Hao Lu
乙烷蒸汽裂解制乙烯装置产生大量含油、悬浮物的有机污水，会导致换热器堵塞和蒸汽再生困难。工艺水的有效处理和回用是保证乙烯装置稳定运行的关键之一。传统的多级串联工艺水处理工艺存在处理流程长、焦粉颗粒堵塞流道、油水分离不彻底等问题。因此，本研究提出一种结合介质颗粒萃取（MPE）与组合纤维聚结（CFC）技术的协同工艺，以去除工艺水中的油和浊度。在实验室试验和分析的基础上，进行了流量为1.6 m3/h的工艺水净化中试。中试结果表明，该工艺可使工艺水的平均含油量从606 mg/L降至18.4 mg/L，平均浊度从1213 NTU降至7.9 NTU，平均分离效率分别为96.96%和99.35%。与现有工艺水处理方法相比，该方法具有操作灵活性高、分离效果好、环境友好等优点。该研究为工业废水的绿色高效处理和回用提供了新的途径。
Ethane steam cracking to ethylene plants produce a large amount of organic sewage containing oil and suspended solids, which can lead to heat exchanger blockage and steam regeneration difficulties. Efficient treatment and recycling of process water is one of the keys to ensure a stable operation of ethylene production plant. The traditional multi-stage tandem process water treatment process has issues such as long treatment process, blockage of flow path by coke powder particles, and incomplete oil–water separation. Therefore, this study proposes a cooperative process combining medium particles extraction (MPE) and combined fibrous coalescence (CFC) technology to remove oil and turbidity in process water. Based on laboratory tests and analyses, a pilot test of process water purification with a flow rate of 1.6 m3/h was implemented. The results of the pilot test demonstrated that the process reduced the average oil content of process water from 606 to 18.4 mg/L and the average turbidity from 1213 to 7.9 NTU, with average separation efficiencies of 96.96 % and 99.35 %, respectively. Compared with current process water treatments, this approach provides a higher operational flexibility, better separation effect, and it is more environmentally friendly. This study provides a novel approach for a green and efficient treatment and recycling of process water.