亲疏水纤维组合形态对油水分离性能的影响关系研究

发布时间：2018-06-22 21:52

本文选题：W/O型乳化液 + 粒径分布　；参考：《华东理工大学》2017年硕士论文

【摘要】：在石油化工工业中存在许多油液带水的现象,会带来产品质量不合格、加工能耗增加及安全隐患等问题。聚结分离技术具有分离时间短、效率高、能耗低等优势,在液-液两相分离领域得到了研究者的广泛关注。本文在流变系数修正的stokes沉降公式基础上,采用理论分析与实验验证的方法,研究了测试W/O型乳化液粒径分布的新型重力沉降测定法。采用实验研究与CFD数值模拟方法,研究了乳化程度、分散相浓度、组合纤维模块厚度等相关因素对组合纤维聚结分离过程内部流场、分离性能的影响规律,并在碳四深度脱甲醇系统实现技术应用,研究表明:(1)新型重力沉降测定法可以准确测试W/O型乳化液粒径分布范围,利用此方法分析组合纤维聚结分离模块对乳化液粒径分布的再分散作用,增设二级组合纤维聚结分离模块可以有效提升分离性能。.(2)组合纤维聚结分离过程中,流速与乳化液粒径分布是影响分离性能的两大因素,对分离性能影响因素依次为:流速乳液粒径聚结模块厚度体积比表面积分散相浓度。对给定乳化液的操作条件下,组合纤维聚结分离的流速存在临界值,流速低于临界值时,分离效率随着流速增加基本不变,本研究体系中流速临界值优选0.7m/min。(3)聚结模块的压降随着流速、模块厚度增加而线性增加,随着孔隙率的减小而增加。流体在纤维间隙中存在明显加速,纤维层间隙中速度分布呈现"M"状分布。(4)微萃取耦合亲疏水组合纤维深度脱水的集成技术可实现碳四深度脱甲醇的要求,具有水耗量低、分离精度高、占地面积小的优势。
[Abstract]:There are many phenomena of oil with water in petrochemical industry, which will bring about some problems, such as unqualified product quality, increased energy consumption and hidden safety problems. Because of the advantages of short separation time, high efficiency and low energy consumption, coalescence separation technology has been widely concerned by researchers in the field of liquid-liquid two-phase separation. Based on the modified stokes settlement formula with rheological coefficient, a new gravity sedimentation method for measuring the particle size distribution of W / O emulsion is studied by theoretical analysis and experimental verification. By means of experimental study and CFD numerical simulation, the effects of emulsification degree, dispersion phase concentration and the thickness of composite fiber module on the internal flow field and separation performance of composite fiber were studied. The results show that: (1) the new gravity sedimentation method can accurately measure the particle size distribution range of W / O emulsion. This method is used to analyze the redispersion of composite fiber coalescence separation module on the particle size distribution of emulsion. The addition of secondary composite fiber aggregation separation module can effectively improve the separation performance. (2) in the process of composite fiber aggregation separation, The flow rate and the particle size distribution of the emulsion are two major factors affecting the separation performance. The influencing factors on the separation performance are as follows: the volume specific surface area dispersion phase concentration of the flow rate emulsion particle size coalescence module thickness. When the flow rate is lower than the critical value, the separation efficiency is basically unchanged with the increase of the flow rate. In this study, the critical value of flow rate is chosen to be 0.7m / min. (3) the pressure drop of the coalescence module increases linearly with the flow rate, the thickness of the module increases linearly, and increases with the decrease of porosity. The fluid accelerates obviously in the fiber gap, and the velocity distribution in the fiber layer presents a "M" shape distribution. (4) the integrated technology of microextraction coupled with hydrophilic composite fiber deep dehydration can meet the requirement of carbon four depth methanol removal, and has low water consumption. The advantages of high separation precision and small area.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ028.3

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