喷雾干燥塔的设计与数值模拟
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摘要
本文给出了一种喷雾干燥塔的设计方法。将雾滴在干燥塔内部的运动分解为径向运动和轴向运动,通过雾滴水平速度与时间的关系,图解积分计算出喷雾干燥塔的最小塔径,然后根据塔径进一步估算出塔高。通过物料衡算和热量衡算,得到喷雾干燥过程中的水分蒸发量以及干燥介质用量。结合使用CFX18.1对该喷雾干燥塔建模,并对喷雾干燥过程进行数值模拟,出气口温度和湿度的仿真结果与理论值比较一致,得到的催化剂粒度分布理想,进一步验证了喷雾干燥塔设计方法的可行性与可靠性。
This paper gives a design method of spray drying tower. The movement of the droplets in the drying tower is decomposed into the radial movement and the axial movement. The minimum tower diameter of the spray drying tower is calculated by integrating the horizontal velocity of the droplet with time,and the tower height is further estimated according to the tower diameter. Through the material and heat conservation calculation,the amount of water evaporation and the amount of drying medium during the spray drying process are obtained. The spray drying tower was modeled and the spray drying process was numerically simulated. The simulation results of outlet temperature and humidity were consistent with the theoretical ones,and the catalyst particle size distribution was ideal,which further verified the feasibility and reliability of the spray drying tower design method.
This paper gives a design method of spray drying tower. The movement of the droplets in the drying tower is decomposed into the radial movement and the axial movement. The minimum tower diameter of the spray drying tower is calculated by integrating the horizontal velocity of the droplet with time,and the tower height is further estimated according to the tower diameter. Through the material and heat conservation calculation,the amount of water evaporation and the amount of drying medium during the spray drying process are obtained. The spray drying tower was modeled and the spray drying process was numerically simulated. The simulation results of outlet temperature and humidity were consistent with the theoretical ones,and the catalyst particle size distribution was ideal,which further verified the feasibility and reliability of the spray drying tower design method.
引文
[1]龚占魁,谢进宁.喷雾干燥技术在分子筛催化剂生产中的应用研究[J].辽宁化工,2016,(07):924~926.
[2]刘广文.喷雾干燥实用技术大全[M].北京:中国轻工业出版社,2001:113~195.
[3]匡国柱,史启才.化工单元过程及设备课程设计[M].北京:化学工业出版社,2002:350~376.
[4]阮奇,李玲,等.计算喷雾干燥塔直径和高度的解析法[J].农业工程学报,2004,(02):113~117.
[5]王宝和,王喜忠.喷雾干燥过程的两种热量衡算方法[J].第十三届全国干燥会议论文集,2011.
[6]Huang Lin-xin,Kumar K.Simulation of A Spray Dryer fitted with A Rotary Disk Atomizer Using a Three-dimensional Computional Fluid Dynamic Model[J].Drying Technology,2004,22(6):1489~1515.
[7]ANSYS CFX 18.1 User’s Guide,2017.
[8]陈前.喷雾干燥制粒机内气固两相流动与传热过程数值模拟研究[D].湖南:湘潭大学,2015.
[2]刘广文.喷雾干燥实用技术大全[M].北京:中国轻工业出版社,2001:113~195.
[3]匡国柱,史启才.化工单元过程及设备课程设计[M].北京:化学工业出版社,2002:350~376.
[4]阮奇,李玲,等.计算喷雾干燥塔直径和高度的解析法[J].农业工程学报,2004,(02):113~117.
[5]王宝和,王喜忠.喷雾干燥过程的两种热量衡算方法[J].第十三届全国干燥会议论文集,2011.
[6]Huang Lin-xin,Kumar K.Simulation of A Spray Dryer fitted with A Rotary Disk Atomizer Using a Three-dimensional Computional Fluid Dynamic Model[J].Drying Technology,2004,22(6):1489~1515.
[7]ANSYS CFX 18.1 User’s Guide,2017.
[8]陈前.喷雾干燥制粒机内气固两相流动与传热过程数值模拟研究[D].湖南:湘潭大学,2015.