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将裂解气中的重组分看做由多种轻重不同的成分组成,各成分代表不同物系,所占比重也各不相同.利用该方法对国内某乙烯厂急冷系统汽油分馏塔进行了模拟研究,讨论了不同参数对装置运行效果的影响,分析了黏度变化规律,模拟结果与工艺设计数据符合较好. 相似文献
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Structured packing is a good candidate for CO2 capture process because of its higher mass transfer efficiency and lower pressure drop.Now,the challenging problem of CO2 capture and storage demands more and more efficiency equipment.The aim of the present study is to investigate the liquid film characteristics under counter current gas phase and throw some insight into the enhancing mechanism of mass transfer performance in structured packing.A high speed digital camera,non-intrusive measurement technique,was used.Water and air were working fluids.Experiments were carried out for different gas/liquid flow rates and different inclination angles.The time-average and instantaneous film widths for each set of flow parameters were calculated.It is shown that the effects of gas phase could be neglected for lower flow rate,and then,become more pronounced at higher flow rate.According to instantaneous film width,three different stages can be distinguished.One is the constant width of liquid film.The second is the slight decrease of film width and the smooth surface.This kind of character will lead to less interfacial area and deteriorate the packing mass transfer performance.For the third stage,the variation of film width shows clearly chaotic behavior.The prediction model was also developed in present work.The predicted and experimental results are in good agreement. 相似文献
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本文结合某污水管道与雨水管道合槽施工的实例,探讨的合槽施工的成本、质量及进度等情况,并与传统施工方法进行了分析比较,对相关工作人员有一定的借鉴作用。 相似文献
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项目组合选择是战略项目管理决策的重要环节,目前基于决策者偏好的交互项目组合选择的研究仍然在模型和算法上存在不足。首先提出级别优先模型细致划分了项目间的偏好关系,并引入了项目间的协同交互,使模型更加完备。进而结合该模型改进了多目标粒子群算法,加快其收敛速度,并拓展其非劣解的多样性。在考虑决策者偏好和项目间交互约束的条件下,分别对偏好模型和模型求解算法进行了仿真验证。仿真结果表明,采用级别优先模型所得的非劣解更加接近项目组合选择的最优解,改进粒子群算法的搜索速度更快。 相似文献
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