潮湿环境下微尺度颗粒撞击平板的动力学研究

doi:10.11949/0438-1157.20211611

化工学报 ›› 2022, Vol. 73 ›› Issue (5): 1940-1946.DOI: 10.11949/0438-1157.20211611

潮湿环境下微尺度颗粒撞击平板的动力学研究

李雪¹(),东明²,张璜³,谢俊⁴

^1.武汉工程大学光电信息与能源工程学院，湖北武汉 430205
^2.大连理工大学能源与动力学院，辽宁大连 116024
^3.清华大学核能与新能源技术研究院，北京 100084
^4.沈阳航空航天大学能源与环境学院，辽宁沈阳 110136

收稿日期:2021-11-12 修回日期:2022-03-29 出版日期:2022-05-05 发布日期:2022-05-24
通讯作者: 李雪
作者简介:李雪（1990—），女，博士，讲师，21040801@wit.edu.cn
基金资助:
先进反应堆工程与安全教育部重点实验室开放基金项目(ARES-2021-04);煤燃烧国家重点实验室开放基金项目(FSKLCCA2209);武汉工程大学基金项目(K2021079);国家自然科学基金项目(51876031)

Kinetic characteristics of micro-particle impact on a flat surface under humidity conditions

Xue LI¹(),Ming DONG²,Huang ZHANG³,Jun XIE⁴

^1.School of Optical and Energy Engineering, Wuhan Institute of Technology, Wuhan 430205, Hubei, China
^2.School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
^3.Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
^4.School of Energy and Environment, Shenyang Aerospace University, Shenyang 110136, Liaoning, China

Received:2021-11-12 Revised:2022-03-29 Online:2022-05-05 Published:2022-05-24
Contact: Xue LI

摘要/Abstract

摘要：

传统除尘装置对煤燃烧排放的颗粒物存在穿透窗口，湿式静电除尘器通过喷水增湿能够显著提高其脱除效率。对于不同煤种和湿度，脱除效率存在差异。因此搭建潮湿环境下不同飞灰颗粒撞击平板实验台并建立颗粒碰撞动力学模型，探究恢复系数的变化规律。结果表明，65%湿度下无烟煤的恢复系数最小，易于捕集；随着相对湿度增加，毛细力占主导，阻尼系数、临界捕集速度和接触时间增加。

关键词: 煤燃烧, 增湿, 粒子, 相对湿度, 恢复系数, 毛细力

Abstract:

Conventional dust removal device has a penetration window for the particles from coal combustion. The dust removing efficiency of wet electro-static precipitator could be improved by increasing the relative humidity (RH). The efficiency is different in coal and RH. The experimental facility and kinetic model for different fly ash particles against a flat surface under humid conditions were built to explore the variation of restitution coefficient. The results show that the coefficient of restitution of anthracite is the smallest under 65% RH, and it is easy to capture. With the increase of RH, the capillary force is dominant, and the damping coefficient, critical impact velocity and contact time increase.

Key words: coal combustion, humidification, particle, relative humidity, restitution coefficient, capillary force

中图分类号:

TQ 534.9

李雪, 东明, 张璜, 谢俊. 潮湿环境下微尺度颗粒撞击平板的动力学研究[J]. 化工学报, 2022, 73(5): 1940-1946.

Xue LI, Ming DONG, Huang ZHANG, Jun XIE. Kinetic characteristics of micro-particle impact on a flat surface under humidity conditions[J]. CIESC Journal, 2022, 73(5): 1940-1946.

图/表 10

图1 实验系统示意图

Fig.1 Schematic diagram of the experimental system

表1 飞灰的全元素分析

Table 1 Total elemental analysis of fly ash particles

飞灰	含量/%
飞灰	SiO₂	Al₂O₃	CaO	MgO	TiO₂	SO₃	P₂O₅	Na₂O	Fe₂O₃	其他
NM	28.20	12.30	26.50	1.82	0.30	9.51	0.01	2.48	9.10	9.78
LN	52.30	36.40	2.39	0.63	2.84	2.08	1.42	0.56	0	1.38
XJ	14.30	15.70	23.40	9.00	0.60	17.2	0.13	4.82	12.4	2.45

表2 飞灰粒子的物性参数

Table 2 Physical parameters of fly ash particles

飞灰	密度/（kg/m³）	杨氏模量/GPa
NM	2815.46	140.61
LN	2680.25	115.93
XJ	2953.56	138.69

图2 飞灰的粒径分布

Fig.2 Size distribution of fly ash particle

图3 颗粒与平板接触示意图

Fig.3 Schematic of contact model between particle and flat

图4 干燥、潮湿环境下的法向恢复系数

Fig.4 Normal restitution coefficient under dry and humid conditions

图5 黏附力随分离距离变化

Fig.5 Adhesion force versus separation

图6 阻尼系数随入射速度变化

Fig.6 Damping coefficient versus incident velocity

表3 不同环境下的临界捕集速度

Table 3 Critical values of impact velocity in different conditions

飞灰

干燥

临界捕集速度/（m/s）

65%湿度

临界捕集速度/（m/s）

图7 飞灰入射和反弹时间

Fig.7 Incident time and rebound time of fly ash particles

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潮湿环境下微尺度颗粒撞击平板的动力学研究

Kinetic characteristics of micro-particle impact on a flat surface under humidity conditions

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