Research on Ignition Energy Characteristics and Explosion Propagation Law of Coal Dust Cloud under Different Conditions

Tianqi Liu,Weiye Tian,Zhixin Cai,Ruiheng Jia,Ruicheng Sun,Ning Wang,Zhengbiao Peng

doi:10.1155/2021/3052191

Tianqi Liu, Weiye Tian + Show 5 more

Open Access

https://doi.org/10.1155/2021/3052191

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Abstract

To study the ignition energy characteristics and explosion propagation law of coal dust cloud, a kind of coal dust cloud is studied through experiment and numerical simulation under different conditions. The result indicated that ignition delay time and dust spray pressure have obvious effects on the minimum ignition energy of coal dust cloud. CFD theory is used to simulate the explosion flame propagation. It is found that the simulation error of flame propagation distance is acceptable and the simulation result is consistent with the experimental result. When the spray pressure is 0.06 MPa, the flame propagation distance is the farthest, indicating that the turbulence of coal dust cloud is the largest at this condition. As the ignition temperature increases, the flame propagation distance continues to increase, proving that ignition temperature has an obvious effect on the flame propagation process of coal dust cloud explosion.

Highlights

In this paper, a kind of coal dust cloud was applied to conduct the experiments under different conditions in confined space
E test device for flame propagation characteristics of coal dust cloud explosion is shown in Figure 2, which is composed of a glass pipeline system, a dust spray system, a high temperature ignition system, a camera system, a bracket system, a data collection system, and a pipeline cleaning system. e glass pipeline is 1.4 meters long. e outer wall of the pipeline is marked with the unit of length in centimeters
After putting two grams of coal dust into the coal sample tube, the microair compressor will form highpressure air, and the coal dust in the coal sample tube will be brought into the glass pipeline to form a suspended dust cloud, which will explode in the vicinity of the high-temperature platinum wire. e high temperature platinum wire is 0.2 m apart from the coal sample tube

Summary

Introduction

A kind of coal dust cloud was applied to conduct the experiments under different conditions in confined space. E test device for flame propagation characteristics of coal dust cloud explosion is shown, which is composed of a glass pipeline system, a dust spray system, a high temperature ignition system, a camera system, a bracket system, a data collection system, and a pipeline cleaning system.

Results

Conclusion