LIU Xiaoyana, YANG Ruixiaa,b,c, LI Xiaoquana,b,c, YANG Zhiwena, LIU Haoa
(a. School of Resources, Environment and Materials, b. State Key Laboratory of Featured Metal Materials and Life-cycles Safety for Composite Structures, c. Guangxi Higher School Key Laboratory of Minerals Engineering, Guangxi University, Nanning 530004, China)
Abstract：The micron zinc powders are easily suspended in the air, forming a dust cloud with explosive risk. An explosion accident will likely occur if the dust mass concentration reaches the lower explosion limit. Also, the lower explosion limit decreases with the decreasing in dust particle size, and the possibility of explosion increases. In order to study the explosion risk of micron zinc powders, size 1 μm zinc powders were taken as the research object, the explosion mechanism was studied by observing zinc powders and explosion products while using scanning electron microscope, the influences of ignition delay time and mass concentration on the explosion parameters, and the determinations of the lowest explosion limit, maximum explosion pressure, and maximum rate of pressure rise were done by using 20 L spherical explosion test device. The results show that zinc powders explosion is gas phase combustion process and the optimal ignition delay time is 180 ms. On the condition, the lowest explosion limit is between 1 500 g/m3 and 2 000 g/m3. The maximum explosion pressure, the maximum rate of pressure rise, and the maximum explosion index are 0.481 MPa, 46.67 MPa/s, and 12.67 MPa·m/s successively when mass concentration is 5 000 g/m3. The hazard class of micron zinc powders is St1 and the explosive hazard is weak.
Keywords：dust explosion; micron zinc powder; lowest explosion limit; maximum explosion pressure; maximum explosion index
Get Citation：LIU X Y, YANG R X, LI X Q, et al. Explosion hazard of micron zinc powders[J]. China Powder Science and Technology, 2023, 29(5): 33-39.
DOI：10.13732/j.issn.1008-5548.2023.05.005
Received：2023-02-15,Revised：2023-05-27,Online：2023-07-27 13：32。
Funding Project：国家自然科学基金,编号:52264014;广西壮族自治区自然科学基金,编号:2020GXNSFAA297037。
First Author：刘晓妍(1998—),女(壮族),硕士研究生,研究方向为粉尘爆炸。E-mail: 2115392050@st.gxu.edu.cn。
Corresponding Author：杨瑞霞(1981—),女,讲师,博士,硕士生导师,研究方向为粉尘爆炸、 应急管理、 材料表面工程。E-mail: rx-Yang@hotmail.com。
CLC No：TB4; X941
Type Code：A
Serial No：1008-5548(2023)05-0033-07
