The Frontier Energy Technologies Centre, Chemical Engineering, School of Engineering, Faculty of Engineering & Built Environment, The University of Newcastle, Callaghan, NSW 2308, Australia.
The Frontier Energy Technologies Centre, Chemical Engineering, School of Engineering, Faculty of Engineering & Built Environment, The University of Newcastle, Callaghan, NSW 2308, Australia.
J Hazard Mater. 2017 Oct 5;339:301-309. doi: 10.1016/j.jhazmat.2017.06.012. Epub 2017 Jun 20.
There has been a surge of interest from the extractive industries in the application of mechanical means to the mitigation of flame deflagration. To verify the implementation and performance of passive and active mitigation protection, a comprehensive experimental investigation has been conducted on a large scale detonation tube, 30m long and 0.5m in diameter, with two mitigation valves (passive and active) and a burst panel venting system. The valves were used alternately to mitigate the flame deflagration of methane in concentrations ranging from 1.25% to 7.5%. The experimental work revealed that locating the passive mitigation valve at 22m distance from the ignition source mitigates the flame by fully isolating the tube. However, closing the valve structure in the axial direction generated another pressure wave upstream, which was approximately the same value as for the original pressure wave upstream. In the case of the active mitigation system, the system perfectly isolated upstream from downstream with no further pressure wave generation. When the vent was located at 6.5m from the ignition source, the total pressure was reduced by 0.48bar. Due to the counter flow of the reflected pressure wave the flame was extinguished at 12.5m from the ignition source.
采掘业对机械手段缓解火焰爆炸的应用产生了浓厚的兴趣。为了验证被动和主动缓解保护的实施和性能，在一个长 30 米、直径 0.5 米的大型爆轰管上进行了全面的实验研究，该爆轰管配备了两个缓解阀（被动和主动）和一个爆破盘通风系统。阀交替使用，以缓解甲烷浓度在 1.25%至 7.5%范围内的火焰爆炸。实验结果表明，将被动缓解阀放置在距点火源 22 米的位置，可以通过完全隔离管道来缓解火焰。然而，关闭轴向方向的阀结构会在上游产生另一个压力波，其值与原始上游压力波大致相同。在主动缓解系统的情况下，系统完全隔离了上下游，没有进一步产生压力波。当通风口位于距点火源 6.5 米的位置时，总压力降低了 0.48 巴。由于反射压力波的逆流，火焰在距点火源 12.5 米处熄灭。
