Rahimi Masoud, Shahhosseini Shahrokh, Sobati Mohammad Amin, Movahedirad Salman, Khodaei Behrang, Hassanzadeh Hossein
Process Simulation and Control Research Laboratory, School of Chemical Engineering, Iran University of Science and Technology, 16846 Tehran, Iran; School of Chemical Engineering, Iran University of Science and Technology, P.O. Box 16765-163, Tehran, Iran.
Process Simulation and Control Research Laboratory, School of Chemical Engineering, Iran University of Science and Technology, 16846 Tehran, Iran; School of Chemical Engineering, Iran University of Science and Technology, P.O. Box 16765-163, Tehran, Iran.
Ultrason Sonochem. 2019 Sep;56:264-273. doi: 10.1016/j.ultsonch.2019.04.024. Epub 2019 Apr 11.
In this work, a cylindrical multi-probe continuous flow system with different injection strategies was exploited to study ultrasound assisted oxidative desulfurization process. The effects of nozzle number, nozzle diameter, ultrasonic power and volumetric flow rate (residence time) on the desulfurization efficiency of the diesel fuel were investigated. It was found that the sulfur removal increases by increasing the nozzle diameter when the flow rate is fixed. Sulfur removal was increased by increasing the residence time, for all types of the nozzles. Injection of the aqueous phase below the horn tip in the active zone provides the conditions by which the higher interfacial area between the phases and thus greater conversion rate can be obtained. The results indicated that over 97% sulfur removal was achieved using the double-nozzle injection with nozzle diameter of 1.5 mm, residence time of 15 min, electrical power of 277.2 W and volumetric flow rates of the aqueous and oil phases 48.89 and 244.44 mL/min, respectively. The simulation results showed that choosing a proper injection strategy has an impact on the hydrodynamic and flow pattern induced by ultrasonic field and in turn could effectively influence the mixing of the two-immiscible phases. A more uniform distribution of the aqueous-phase volume fraction was observed in the system with double-nozzle injection in comparison with the single nozzle injection.
在这项工作中，利用具有不同注入策略的圆柱形多探头连续流动系统来研究超声辅助氧化脱硫过程。研究了喷嘴数量、喷嘴直径、超声功率和体积流量（停留时间）对柴油脱硫效率的影响。研究发现，当流量固定时，脱硫率随喷嘴直径的增加而提高。对于所有类型的喷嘴，脱硫率都随停留时间的增加而提高。在活性区的变幅杆尖端下方注入水相可提供条件，从而获得更高的相间界面面积，进而实现更高的转化率。结果表明，使用直径为1.5毫米的双喷嘴注入、停留时间为15分钟、电功率为277.2瓦、水相和油相的体积流量分别为48.89和244.44毫升/分钟时，脱硫率超过97%。模拟结果表明，选择合适的注入策略会对超声场引起的流体动力学和流型产生影响，进而能够有效地影响两种不混溶相的混合。与单喷嘴注入相比，在双喷嘴注入的系统中观察到水相体积分数分布更均匀。
