排风流热回收装置内上喷式液滴群特征与运移

doi:10.16265/j.cnki.issn1003-3033.2022.03.022

中国安全科学学报 ›› 2022, Vol. 32 ›› Issue (3): 158-166.doi: 10.16265/j.cnki.issn1003-3033.2022.03.022

排风流热回收装置内上喷式液滴群特征与运移

樊思雨¹^,²(), 陈世强²^,³^,^**(), 贺维国⁴, 田峰⁴, 刘纯玉¹^,³, 刘刚²

¹湖南科技大学土木工程学院,湖南湘潭 411201
²湖南省矿山通风与除尘装备工程技术研究中心, 湖南湘潭 411100
³桂林航天工业学院能源与建筑环境学院,广西桂林 541004
⁴中铁第六勘察设计院集团有限公司隧道设计分公司,天津 300133

收稿日期:2022-01-07 修回日期:2022-02-26 出版日期:2022-08-23
通讯作者:
**陈世强(1978-),男,贵州遵义人,博士,副教授,主要从事地下通风安全及其装备节能研究。E-mail: shiqiangchen@hnust.edu.cn。
作者简介:
樊思雨 (1997—),女,四川成都人,硕士研究生,主要研究方向为地下通风与空气调节研究。E-mail: 1281763159@qq.com。
陈世强副教授
基金资助:
国家自然科学基金资助(51774134); 湖南省自然科学基金资助(2019JJ60044); 湖南省研究生科研创新项目(QL20210235)

Characteristics and movement of upper spray droplets in exhaust air flow heat recovery device

FAN Siyu¹^,²(), CHEN Shiqiang²^,³^,^**(), HE Weiguo⁴, TIAN Feng⁴, LIU Chunyu¹^,³, LIU Gang²

¹School of Civil Engineering, Hunan University of Science and Technology, Xiangtan Hunan 411201, China
²Hunan Mine Ventilation and Dust Removal Equipment Engineering Technology Research Center, Xiangtan Hunan 411100, China
³Department of Building Environment and Energy Engineering, Guilin University of Aerospace Technology, Guilin Guangxi 541004, China
⁴Tunnel Design Branch, China Railway Liuyuan Group Co., Ltd.,Tianjin 300133, China

Received:2022-01-07 Revised:2022-02-26 Published:2022-08-23

摘要/Abstract

摘要：

为有效提高矿井排风热湿能量提取效率,在上喷式矿井排风流热回收装置内,采用马尔文激光粒度仪,开展喷嘴雾化压力、排风流风速对上喷式液滴群特征粒径与分散相分数影响试验,完成21个工况的沿程数据实测;应用临界韦伯数和韧带直径计算式,明确喷嘴操作参数与排风流动力学参数对液滴群分散相分数的影响;引入分散相分数,推导出具有液滴群特征粒径的单一液滴运移关联式。结果表明:液膜的初次破碎类型为长波长线性不稳定性破碎,当喷嘴雾化压力增大时,液滴粒径减小,分散相分数增大;引入分散相分数后,阻力系数增大,分散相分数对排风流热回收装置内的液滴群运移表现出类润滑作用。

关键词: 排风流, 液滴群, 分散相分数, 阻力系数, 运移极限值

Abstract:

In order to effectively improve the efficiency of heat and wet energy extraction from mine exhaust, effects of nozzle atomization pressure and airflow speed on up-spray droplet group's characteristic particle size and dispersed phase fraction were tested by using Malvern laser particle size analyzer in the mine exhaust heat and humidity extraction device with upper spray type, and data of 21 engineering conditions were tested and collected. Then, influence of nozzle operation parameters and exhaust airflow mechanical parameters on dispersed phase fraction of droplet groups was determined by using critical Weber number and ligament diameter calculation formula. Finally, a single droplet's migration correlation with droplet group characteristic particle size was derived by introducing dispersed phase fraction. The results show that the primary breakage type of liquid film is linear instability breakage with long wavelength. When nozzles' atomizing pressure increases, particle size of liquid droplets decreases while fraction of dispersed phase increases. The resistance coefficient increases with the introduction of dispersed phase fraction, which has a quasi-lubrication effect on droplet migration.

Key words: exhaust airflow, droplet group, dispersed phase fraction, resistance coefficient, extreme distance of migration

樊思雨, 陈世强, 贺维国, 田峰, 刘纯玉, 刘刚. 排风流热回收装置内上喷式液滴群特征与运移[J]. 中国安全科学学报, 2022, 32(3): 158-166.

FAN Siyu, CHEN Shiqiang, HE Weiguo, TIAN Feng, LIU Chunyu, LIU Gang. Characteristics and movement of upper spray droplets in exhaust air flow heat recovery device[J]. China Safety Science Journal, 2022, 32(3): 158-166.

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喷雾压力/MPa	评价指标	液滴粒径/μm
喷雾压力/MPa	评价指标	30%	35%	40%	45%	50%	55%	60%
0.20	D₁₀	199	222	208	212	189	251	241
	D₅₀	431	444	443	452	440	444	460
	D₉₀	797	826	806	801	831	891	801
0.25	D₁₀	244	200	240	234	229	235	231
	D₅₀	467	448	421	423	444	450	478
	D₉₀	771	760	778	769	764	770	803
0.30	D₁₀	156	169	145	150	145	140	166
	D₅₀	490	446	402	421	420	426	400
	D₉₀	760	773	765	752	770	778	800

风量/%		30	35	40	45	50	55	60
0.20 MPa	U_a	3.94	4.50	5.04	5.64	6.23	7.08	7.93
	U_l	14.00
	U_s0	10.06	9.50	8.96	8.36	7.77	6.92	6.07
0.25 MPa	U_a	3.94	4.50	5.04	5.64	6.23	7.08	7.93
	U_l	15.65
	U_s0	11.71	11.15	10.61	10.01	9.42	8.57	7.72
0.30 MPa	U_a	3.94	4.50	5.04	5.64	6.23	7.08	7.93
	U_l	17.15
	U_s0	13.21	12.65	12.11	11.51	10.92	10.07	9.22

排风流热回收装置内上喷式液滴群特征与运移

Characteristics and movement of upper spray droplets in exhaust air flow heat recovery device

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