洗涤冷却管内垂直降膜流动特性

doi:10.3969/j.issn.0438-1157.2013.06.009

化工学报 ›› 2013, Vol. 64 ›› Issue (6): 1959-1968.DOI: 10.3969/j.issn.0438-1157.2013.06.009

洗涤冷却管内垂直降膜流动特性

王灵萍, 王亦飞, 郭强强, 颜留成, 于广锁

煤气化及能源化工教育部重点实验室,华东理工大学洁净煤技术研究所,上海 200237

收稿日期:2012-09-21 修回日期:2013-02-21 出版日期:2013-06-05 发布日期:2013-06-05
通讯作者: 王亦飞
作者简介:王灵萍(1987—),女,硕士研究生。
基金资助:
国家重点基础研究发展计划项目(2010CB22700)。

Flow characteristics of vertical falling film in scrubbing-cooling pipe

WANG Lingping, WANG Yifei, GUO Qiangqiang, YAN Liucheng, YU Guangsuo

Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, Institute of Clean Coal Technology, East China University of Science and Technology, Shanghai 200237, China

Received:2012-09-21 Revised:2013-02-21 Online:2013-06-05 Published:2013-06-05
Supported by:
supported by the National Basic Research Program of China(2010CB22700).

摘要/Abstract

摘要： 采用双平行电导探针对多喷嘴煤气化过程中洗涤冷却管内垂直降膜的液膜厚度分布进行了实验研究,研究发现,经洗涤冷却水分布环分配后在洗涤冷却管内形成的液膜在进口段200～400 mm处呈明显的不均匀分布,液膜厚度差值高达3 mm。流动方向上的液膜波动变化与平均液膜厚度变化相似,但具有滞后性。研究还表明,在2.4～14 m³·h^-1的进水流量范围内,整体液膜厚度随着流量的增大而增大,由此对洗涤冷却管内液膜充分发展区的平均液膜厚度建立了经验关联式。实验还发现,洗涤冷却水分布环的槽缝宽度对液膜分布影响显著,在本文研究条件下,最佳槽缝宽度为3 mm,槽缝宽度继续增大,液膜的均匀性下降。另外,随着气相表观速度的增大,整体液膜厚度减小,但一定程度上改善了液膜分布的均匀性。

关键词: 洗涤冷却管, 垂直降膜, 液膜厚度, 激冷, 煤气化

Abstract: The liquid film thickness inside the scrubbing-cooling pipe in the process of coal gasification with multi-burners was investigated by parallel conductivity probe.The results showed that the liquid film was not uniform, especially in the entrance region of 200—400 mm, with the difference up to 3 mm.The unsteady fluctuation of liquid film was related to the film thickness.For a thicker liquid film, the fluctuation range was larger, but the change of fluctuation lagged.It was also found that the film thickness increased with increasing liquid flow rate.On the basis of the experimental data, an empirical equation was proposed for the mean film thickness in the fully developed zone.The slot width of quench ring had a significant influence on the thickness of liquid film.In this study, the best slot width was 3 mm, and larger slot width would make the film thickness more non-uniform.In addition, the film thickness became thinner under the effect of gas phase.In some way, the film thickness was more uniform because the drag force increased with increasing superficial gas velocity.

Key words: scrubbing-cooling pipe, vertical falling film, film thickness, quench, coal gasification

中图分类号:

TQ021

王灵萍, 王亦飞, 郭强强, 颜留成, 于广锁. 洗涤冷却管内垂直降膜流动特性[J]. 化工学报, 2013, 64(6): 1959-1968.

WANG Lingping, WANG Yifei, GUO Qiangqiang, YAN Liucheng, YU Guangsuo. Flow characteristics of vertical falling film in scrubbing-cooling pipe[J]. CIESC Journal, 2013, 64(6): 1959-1968.

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洗涤冷却管内垂直降膜流动特性

Flow characteristics of vertical falling film in scrubbing-cooling pipe

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