An analysis of the gas-solid plug flow formation: New insights into the coal failure process during coal and gas outbursts

被引：73

作者：

Zhao, Wei ^{[1
,2
,3
]}

Cheng, Yuanping ^{[1
,2
,3
,4
]}

Guo, Pinkun ^{[5
]}

Jin, Kan ^{[1
,2
,3
]}

Tu, Qingyi ^{[1
,2
,3
]}

Wang, Haifeng ^{[1
,2
,3
]}

机构：

[1] China Univ Min & Technol, Minist Educ, Key Lab Coal Methane & Fire Control, Xuzhou 221116, Jiangsu, Peoples R China

[2] China Univ Min & Technol, Natl Engn Res Ctr Coal & Gas Control, Xuzhou 221116, Jiangsu, Peoples R China

[3] China Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Jiangsu, Peoples R China

[4] Univ Wollongong, Sch Civil Min & Environm Engn, Wollongong, NSW 2522, Australia

[5] Chongqing Univ, Coll Resources & Environm Sci, Chongqing 400030, Peoples R China

来源：

POWDER TECHNOLOGY | 2017年 / 305卷

基金：

中国国家自然科学基金;

关键词：

Outburst air knife; Spallation; Pneumatic conveying; Outburst flow speed; ENERGY; MODEL; LAW;

D O I：

10.1016/j.powtec.2016.09.047

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Researches on the failure process of coal during coal and gas outbursts are of great importance in underground mining. Based on the theories of coal spherical shell failure, coal spallation and coal powder pneumatic conveying, the flow state and transport mechanism of coal and gas outbursts were studied. This paper concludes that in the outbursts' development stage, with the front of the outburst being gradually exposed to air, the gas gradient behind the outburst acts as a reciprocating air knife of high pressure that cuts the ejected coal powders, thus forming a plug flow with a high solid-gas ratio and a low speed. By referring to the laboratory results from other researchers and data recorded from field outbursts, an appropriate explanation was obtained for the wave-like coal powder distribution and the sound explosion using the dense-phase plug flow pneumatic conveying theory, which conversely confirms the possible existence of the plug flow. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：39 / 47

页数：9

共 46 条

[1] Magma fragmentation by rapid decompression [J].