Experimental Study on Characteristics of Methane-Coal-Dust Mixture Explosion and Its Mitigation by Ultra-Fine Water Mist

被引：28

作者：

Xu, Hongli ^{[1
]}

Wang, Xishi ^{[1
]}

Gu, Rui ^{[1
]}

Zhang, Heping ^{[1
]}

机构：

[1] Univ Sci & Technol China, State Key Lab Fire Sci, Hefei 230026, Peoples R China

来源：

JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME | 2012年 / 134卷 / 06期

关键词：

explosion; methane; coal dust; explosion mitigation; water mist; GAS-EXPLOSIONS; POOL FIRE; EXTINCTION; SPRAYS;

D O I：

10.1115/1.4005816

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

This paper presents the results of an experimental investigation on the characteristics of methane-coal-dust mixture explosion and its mitigation by ultra-fine water mist. Four E12-1-K-type fast response thermocouples, two printed circuit board (PCB) piezotronic pressure transducers were used to obtain the temperature and pressure history, while a GigaView high-speed camera was used to visualize the processes. Different methane concentrations, coal-dust concentrations, diameters of coal particles, and volumes of ultrafine water mist were considered to investigate their effects on methane-coal-dust mixture explosion. The temperature of explosion flame, the maximum explosion overpressure, the maximum rate of overpressure rise, and the critical volume flux of ultra-fine water mist were experimentally determined. The results show that the characteristics of the methane-coal-dust mixture explosion and the mitigating effectiveness by ultra-fine water mist are influenced by the methane concentration, the coal-dust concentration, the coal-dust diameter and the applied volume flux of ultra-fine water mist. For example, both the maximum explosion overpressure and rate of overpressure rise increased with increasing of coal-dust concentrations and methane concentrations. All of the test cases indicate that ultra-fine water mist can mitigate the mixture explosion and suppress the flame propagation efficiently from the images recorded by the high-speed video camera. [DOI: 10.1115/1.4005816]

引用

页数：6