超临界流体萃喷装置喷嘴结构优化与颗粒不确定度研究
发布时间：2018-10-17 17:49
【摘要】：搭建了超临界流体萃喷装置(Supercritical Fluid Extraction and Expansion, SFEE),该装置耦合联用了超临界流体萃取技术(Supercritical Fluid Extraction, SFE)和超临界流体快速膨胀技术(Rapid Expansion of Supercritical Solution, RESS)两个成熟工艺,将二者功能组合在一起实现一机多样是本课题的目的之一。本文利用SFEE装置制备硬脂酸和烷基烯酮二聚物(Alkyl Ketene Dimer,AKD)产品。通过实验和相关数据分析,改进装置不足之处,硬件控制方面优化了装置喷嘴；软件控制方面引进蒙特卡罗方法(Monte Carlo Method, MCM)评估产品不确定度,并用MATLAB编程实现该方法的计算,最后将程序整合到SFEE装置的自动控制系统；优化了SFEE装置。制备硬脂酸产品中,预膨胀压力从15MPa升至35MPa时：预膨胀温度60℃,颗粒粒径从1.4μm降至0.98gm；预膨胀温度75℃,颗粒粒径从1.71μm降至1.16gm；在75℃时,所制备硬脂酸产品尖端出现弯曲,说明SFEE可以解决热敏性物质的制备问题。实验范围内制备硬脂酸产品的最优条件为35MPa,60℃,高压低温有利于获得粒径更小的硬脂酸产品。制备AKD产品中,预膨胀压力从15MPa升至30MPa时：预膨胀温度40℃,颗粒粒径从2.28μm降至1.50μm；预膨胀温度60℃,颗粒粒径从2.2gm降至1.19gm；经过SFEE处理的纸张表面达到了超疏水性能；实验范围内制备AKD产品的最优工艺条件为30MPa,60℃,说明高压高温有利于获得粒径更小的AKD产品。利用FLUENT软件模拟分析,对SFEE装置喷嘴做进一步改进,优化喷嘴的结构参数和工艺参数,得到所设计喷嘴的最优条件组合为喷嘴入射角α=125。,动环圆锥孔角β=80°,预膨胀压力P=17MPa,预膨胀温度T=373K,环隙宽度e=0.3mm。MCM不确定度评估以概率产生输入量的样本Xi,通过概率模型f传播,估计输出量Y的分布,通过输出量的离散分布G获得其估计值y,标准不确定度材(y),100p%包含区间的左端点ylow,和右端点yhigh。将上述原理用MATLAB编程实现计算,最后将程序整合到SFEE自动控制系统,完成实验后的数据自动分析处理程序。
[Abstract]:A supercritical fluid extraction and spray device (Supercritical Fluid Extraction and Expansion, SFEE),) is built. The device is coupled with two mature processes: supercritical fluid extraction (Supercritical Fluid Extraction, SFE) and supercritical fluid rapid expansion (Rapid Expansion of Supercritical Solution, RESS). It is one of the purposes of this subject to combine the two functions together to realize the diversity of one machine. In this paper, stearic acid and alkyl ketene dimer (Alkyl Ketene Dimer,AKD were prepared by SFEE device. Through the experiment and the related data analysis, the deficiency of the device is improved, the device nozzle is optimized in the aspect of hardware control, the Monte Carlo method (Monte Carlo Method, MCM) is introduced in the software control to evaluate the uncertainty of the product, and the calculation of the method is realized by MATLAB programming. Finally, the program is integrated into the automatic control system of SFEE device, and the SFEE device is optimized. In the preparation of stearic acid products, the pre-expansion pressure increases from 15MPa to 35MPa: the pre-expansion temperature is 60 鈩，
本文编号：2277473
[Abstract]:A supercritical fluid extraction and spray device (Supercritical Fluid Extraction and Expansion, SFEE),) is built. The device is coupled with two mature processes: supercritical fluid extraction (Supercritical Fluid Extraction, SFE) and supercritical fluid rapid expansion (Rapid Expansion of Supercritical Solution, RESS). It is one of the purposes of this subject to combine the two functions together to realize the diversity of one machine. In this paper, stearic acid and alkyl ketene dimer (Alkyl Ketene Dimer,AKD were prepared by SFEE device. Through the experiment and the related data analysis, the deficiency of the device is improved, the device nozzle is optimized in the aspect of hardware control, the Monte Carlo method (Monte Carlo Method, MCM) is introduced in the software control to evaluate the uncertainty of the product, and the calculation of the method is realized by MATLAB programming. Finally, the program is integrated into the automatic control system of SFEE device, and the SFEE device is optimized. In the preparation of stearic acid products, the pre-expansion pressure increases from 15MPa to 35MPa: the pre-expansion temperature is 60 鈩，
本文编号：2277473
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