粒径对TiH2粉尘云燃爆特性及温度分布特征的影响

doi:10.11949/0438-1157.20250022

化工学报 ›› 2025, Vol. 76 ›› Issue (8): 4341-4349.DOI: 10.11949/0438-1157.20250022

• 过程安全 • 上一篇

粒径对TiH₂粉尘云燃爆特性及温度分布特征的影响

马晓文¹(), 程扬帆¹(), 李世周², 梁茹萍³, 鲍忠奥³

^1.安徽理工大学化工与爆破学院，安徽淮南 232001
^2.浙江长鹏科技有限公司，浙江长兴 313117
^3.安徽理工大学安全科学与工程学院，安徽淮南 232001

收稿日期:2025-01-06 修回日期:2025-01-31 出版日期:2025-08-25 发布日期:2025-09-17
通讯作者: 程扬帆
作者简介:马晓文（2001—），女，硕士研究生，402853131@qq.com
基金资助:
安徽省高校自然科学基金杰出青年基金项目(2023AH020026);国家自然科学基金面上项目(12272001);安徽理工大学研究生创新基金项目(2024cx2099)

Effects of particle size on deflagration behaviors and temperature distribution characteristics of TiH₂ dust cloud

Xiaowen MA¹(), Yangfan CHENG¹(), Shizhou LI², Ruping LIANG³, Zhong'ao BAO³

^1.School of Chemical and Blasting Engineering, Anhui University of Science and Technology, Huainan 232001, Anhui, China
^2.Zhejiang Changpeng Technology Co. , Ltd. , Changxing 313117, Zhejiang, China
^3.School of Safety Science and Engineering, Anhui University of Science and Technology, Huainan 232001, Anhui, China

Received:2025-01-06 Revised:2025-01-31 Online:2025-08-25 Published:2025-09-17
Contact: Yangfan CHENG

摘要/Abstract

摘要：

为了探究粒径对TiH₂粉尘云燃爆特性及温度分布特征的影响，采用20 L球形爆炸测试系统和1.2 L哈特曼管测试系统对5.3、17.1、27.8 μm TiH₂粉尘云的燃爆特性进行对比分析，并基于比色测温技术重构出粉尘火焰温度分布云图。实验结果表明：随着粉尘浓度的增大，3种粒径TiH₂的P_max及(dP/dt)_max均呈先增大后减小的趋势；随着TiH₂粉尘粒径的增大，P_max、(dP/dt)_max和K_St均减小，爆炸危险性降低；此外，随着粉尘粒径的增大，TiH₂粉尘云火焰变离散，发光强度变低，火焰传播速度减慢；小粒径TiH₂粉尘云整体火焰温度分布更均匀，大粒径TiH₂粉尘云火焰边缘出现局部高温区，粒径越大局部高温区越明显且火焰形状越不规则。研究结果可为TiH₂粉末材料的安全生产和爆炸防控提供理论参考。

关键词: TiH₂粉尘, 粒径, 比色测温, 燃爆特性, 温度分布

Abstract:

To study the effects of particle size on the deflagration behaviors and temperature distribution characteristics of TiH₂ dust cloud, a 20 L spherical dust explosion test system and a 1.2 L Hartmann tube test system were employed to conduct a comparative analysis for the deflagration characteristics of TiH₂ dust clouds with different particle sizes of 5.3, 17.1 and 27.8 μm. Additionally, flame temperature distribution characteristics were obtained by the two-color pyrometer technique. The experimental results showed that with the increase of dust concentration, the P_maxand (dP/dt)_max values of the TiH₂ with three particle sizes all increased first and then decreased. As the particle size of TiH₂ dust increased, the values of P_max, (dP/dt)_max and K_St all decreased, and consequently lowered the explosion risk. Furthermore, as the dust particle size enlarged, the flame was more dispersed, the luminous intensity decreased and the propagation speed was slower. The overall flame temperature distribution of small-particle TiH₂ dust cloud is more uniform, and local high-temperature areas appear at the edge of the flame of large-particle TiH₂ dust cloud. The larger the particle size, the more obvious the local high-temperature area, and the more irregular the flame shape. The research results could provide theoretical reference for the safe production and explosion prevention of TiH₂ powder materials.

Key words: TiH₂dust, particle size, two-color pyrometer, deflagration characteristics, temperature distribution

中图分类号:

TQ 560.7

马晓文, 程扬帆, 李世周, 梁茹萍, 鲍忠奥. 粒径对TiH₂粉尘云燃爆特性及温度分布特征的影响[J]. 化工学报, 2025, 76(8): 4341-4349.

Xiaowen MA, Yangfan CHENG, Shizhou LI, Ruping LIANG, Zhong'ao BAO. Effects of particle size on deflagration behaviors and temperature distribution characteristics of TiH₂ dust cloud[J]. CIESC Journal, 2025, 76(8): 4341-4349.

图/表 12

图1 实验材料粒度分布

Fig.1 Particle size distribution of experimental samples

图2 20 L球形粉尘爆炸测试系统

Fig.2 20 L spherical dust explosion test system

图3 1.2 L哈特曼管测试系统

Fig.3 1.2 L Hartman tube test system

图4 粒径对TiH2粉尘爆炸特性参数的影响

Fig.4 Effects of particle size on explosion characteristics of TiH2 dust

图5 粉尘粒径对TiH2粉尘燃烧时间t的影响

Fig.5 Effects of dust particle size on TiH2 dust burning time t

表1 KSt值对应的爆炸危险等级

Table 1 Explosion hazard levels corresponding to KSt values

K_St/(MPa·m·s^-1)	爆炸危险等级
0	St-0：非易爆
0~20	St-1：弱到中度爆炸性
20~30	St-2：强烈爆炸性
30以上	St-3：极强爆炸性

图6 粉尘粒径对TiH2粉尘爆炸指数KSt的影响

Fig.6 Effects of dust particle size on TiH2 dust explosion index KSt

图7 D50=5.3 μm TiH2粉尘云火焰传播过程

Fig.7 D50=5.3 μm TiH2 dust cloud flame propagation processes

图8 t = 12 ms时TiH2粉尘传播火焰图

Fig.8 Propagation flame of TiH2 dust at t = 12 ms

图9 粒径对TiH2粉尘火焰传播的影响

Fig.9 Effects of particle size on TiH2 dust flame propagation

图10 400 g·m-3时5.3 μm TiH2粉尘颗粒燃烧温度云图

Fig.10 Temperature mapping of TiH2 dust of 5.3 μm combustion at 400 g·m-3

图11 不同粒径的TiH2粉尘在t = 12 ms时刻的温度云图

Fig.11 Temperature mapping at t = 12 ms of TiH2 dust with different particle sizes

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粒径对TiH₂粉尘云燃爆特性及温度分布特征的影响

Effects of particle size on deflagration behaviors and temperature distribution characteristics of TiH₂ dust cloud

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