脂肪酸甲酯降膜蒸发器沸腾传热性能

doi:10.16085/j.issn.1000-6613.2016.09.009

化工进展 ›› 2016, Vol. 35 ›› Issue (09): 2693-2698.DOI: 10.16085/j.issn.1000-6613.2016.09.009

脂肪酸甲酯降膜蒸发器沸腾传热性能

徐委托¹, 马晓建^1,2, 马力¹, 陈俊英^1,2, 杨闪¹, 张芬芬¹

1 郑州大学化工与能源学院, 河南郑州 450001;
2 生物质炼制技术与装备河南省工程实验室, 河南郑州 450001

收稿日期:2016-01-12 修回日期:2016-03-15 出版日期:2016-09-05 发布日期:2016-09-05
通讯作者: 马晓建,教授,博士生导师,主要从事生物质能源研究。E-mail:maxj@zzu.edu.cn。
作者简介:徐委托(1990-),男,硕士研究生。

Boiling heat transfer characteristics of fatty acid methyl ester(FAME) in falling film evaporator

XU Weituo¹, MA Xiaojian^1,2, MA Li¹, CHEN Junying^1,2, YANG Shan¹, ZHANG Fenfen¹

1 School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, Henan, China;
2 Engineering Laboratory of Henan Province for Bio. Refinery Technology and Equipment, Zhengzhou 450001, Henan, China

Received:2016-01-12 Revised:2016-03-15 Online:2016-09-05 Published:2016-09-05

摘要/Abstract

摘要： 利用传统的多管排列式蒸发器对高黏度、易结垢的混合物进行蒸发，容易造成布液器堵塞，且结垢后的传热管难以清理。因此根据物料特性，本文设计了一种新型的降膜蒸发器，采用大降液孔加倾斜环板进行布膜，利用内径较大的锥筒作为传热壁面，并以粗甲酯作为试验工质对蒸发器的降膜蒸发传热系数随蒸发器筒体半锥度角、液膜流动雷诺数以及输入热通量之间的关系进行了试验研究。结果表明：该型蒸发器对于上述工质具有较好的适用性，蒸发系统能够在保持较高的传热系数的条件下，连续运行而不发生堵塞；蒸发器筒体锥度角有效地强化了降膜蒸发传热过程，而较大的热通量及进料流量在一定程度上却不利于蒸发传热。最后建立了降膜蒸发传热系数随蒸发器筒体半锥角和流动准数之间的经验关联式。

关键词: 脂肪酸甲酯, 降膜蒸发器, 沸腾传热系数

Abstract: Using conventional line-tube heat exchanger for evaporation of high viscosity and easy-to-scaling mixture can easily block liquid distributor and make the cleaning of foul tube impossible. Therefore,a new type of falling film evaporator was designed,which used large liquid orifice plus tilt ring plate for liquid distribution and took larger diameter of conical shell as heat transfer wall. The variation of boiling heat transfer coefficients with shell's taper angle,Reynolds number and heat fluxes were determined by a pilot scale falling film evaporation system,using the FAME mixture as liquid model. Result showed that this type of evaporator worked well for FAME,the system could work smoothly with high heat transfer efficiency for a long time and without the occurrence of clogging. The evaporator shell's taper angle can intensify heat transfer process. The increase of heat flux and feed flow had a negative influence on heat transfer coefficient. Experimental correlation for boiling heat transfer coefficients with consideration of Reynolds number and taper angle of evaporator shell was established.

Key words: fatty acid methyl ester, falling film evaporator, boiling heat transfer coefficient

中图分类号:

徐委托, 马晓建, 马力, 陈俊英, 杨闪, 张芬芬. 脂肪酸甲酯降膜蒸发器沸腾传热性能[J]. 化工进展, 2016, 35(09): 2693-2698.

XU Weituo, MA Xiaojian, MA Li, CHEN Junying, YANG Shan, ZHANG Fenfen. Boiling heat transfer characteristics of fatty acid methyl ester(FAME) in falling film evaporator[J]. Chemical Industry and Engineering Progree, 2016, 35(09): 2693-2698.

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脂肪酸甲酯降膜蒸发器沸腾传热性能

Boiling heat transfer characteristics of fatty acid methyl ester(FAME) in falling film evaporator

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