Abstract:

With the advancement of oil-water separation technology and the development of new materials, the technology of removing emulsified water in oil by coalescence has been realized. In this paper, hydrophilic glass fibers were used as coalescing element to remove emulsified water (d₉₅=10μm) in white oil. The apparent flow rate (5—30m/h) of the feed in the coalescer, the initial water content of the oil (500—4000μL/L), the thickness of the coalescer bed (100—400mm) and the porosity (0.80—0.95) were investigated on the coalescence separation efficiency by experiments, and the response surface method was used to analyze the synergistic effects between the variables to determine the optimal operational conditions, and the grain dimeter separation efficiency under the conditions was analyzed. The experimental results demonstrated that when the apparent flow rate was 14m/h, the initial water content was 1278μL/L, the bed thickness was 275mm, the porosity was 0.85, and the highest separation efficiency was 95.18%. Compared with the predicted value of the response surface (95.02%), the relative error was only 0.17%, which indicated that the regression model had high reliability and good reproducibility of the experiments. The analysis of the inlet and outlet particle size showed that the separation effect of the coalescer increased with the increase of the water droplet size, and the effective separation particle size was >5μm. The research results in this paper have practical application value for the selection of coalescers and the design of operating parameters for separating emulsified water from refined oil products with large density differences by using glass fibers as coalescing elements.

Key words: coalescence, separation, glass fiber, response surface methodology, particle size distribution, emulsions

摘要：

随着油水分离技术的进步及新材料的开发，聚结法脱除油中乳化水的技术得以实现。本文采用亲水性玻璃纤维作为聚结元件，脱除白油中的乳化水（d₉₅=10μm）。通过实验考察聚结器中进料的表观流速（5~30m/h）、油品初始含水量（500~4000μL/L）、聚结器床层厚度（100~400mm）和玻璃纤维的孔隙率（0.80~0.95）对聚结分离效率的影响，并应用响应面法对各变量之间的协同效应进行分析，确定最佳操作条件，分析该条件下的粒级分离效率。实验结果显示，当表观流速为14m/h、初始含水量为1278μL/L、床层厚度为275mm和孔隙率为0.85时，分离效率最高，为95.18%。结果与响应面预测值（95.02%）相比，相对误差仅为0.17%，表明回归模型的可靠性高和实验的重现性较好。进出口粒径的分析表明聚结器的分离效果随水滴粒径的增加而提高，有效分离粒径>5μm。本文研究结果对采用玻璃纤维为聚结元件，分离密度差较大的成品油中乳化水的聚结器选型及操作参数设计具有实际应用价值。

关键词: 聚结, 分离, 玻璃纤维, 响应面法, 粒度分布, 乳液