摘要
针对掘进面迎头粉尘弥散难以控制的难题,设计新型多向涡流风幕发生装置,并基于自行设计的模拟实验平台得出多向涡流风幕风流运移及阻隔粉尘弥散规律。研究结果表明:风流运移规律为多向涡流风幕与迎头距离L_c越大,压抽比Y、压风量Q_f及轴径比Z越小,越利于形成风流均指向迎头运移的阻尘风流场。阻隔粉尘弥散规律为粉尘质量浓度基本随巷道断面与迎头距离的增大而减小或波动减小;随着L_c的增大,阻隔粉尘弥散能力先减小后增大;Y、Z越小,Q_f越大,越利于阻隔粉尘弥散。通风参数变至一定值后,形成阻尘风流场的均匀程度及阻隔粉尘弥散能力基本稳定,并确定了实验掘进面较优通风参数为:L_c=20 m,Y=5:4,Q_f=300 m^3/min,Z=1:9;该参数时全尘、呼吸性粉尘的降尘率平均值分别为95.85%和94.32%。
Considering the problem that it is difficult to control the dust diffusion in tunnelling headings, a new type of multi-direction whirling air curtain generator was designed. Based on the self-designed analogous experimental platform, the law on wind migration of the multi-direction whirling air curtain and the separation of dust diffusion was proved. The results show that the greater the distance Lc from multi-direction whirling air curtain to heading face, the less the press extraction ratio Y, the less the press wind volume Qf, and the less the axial pressure ratio Z, which is beneficial to the formation of the dust prevention wind flow field that points to the heading face. The law on the separation of dust diffusion prevention is that the dust mass concentration decreases and the fluctuation of it decreases basically with the increase of Lc. When Lc increases, the ability of dust diffusion prevention decreases first and then increases. The more Qf is, the less Y and Z are, which is beneficial to the separation of dust diffusion. After the ventilation parameters tend to a certain value, the uniform degree of the dust separation wind flow field and the ability of separate dust diffusion reach basically stable. Some excellent ventilation parameters of experimental heading face are determined： Lc=20 m, Y=5：4, Qf=300 m^3/min, and Z=1：9. With the above parameters, the average dust removal rate of the total coal dust and respirable dust are 95.85% and 94.32%, respectively.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第1期350-358,共9页
Journal of Central South University:Science and Technology
基金
国家自然科学基金煤炭联合基金重点资助项目(U1261205)
国家青年基金资助项目(51404147)
中国博士后科学基金资助项目(2015M570601)
山东科技大学人才引进科研启动基金项目(2014RCJJ029)~~
关键词
掘进面
多向涡流风幕
阻尘风流场
粉尘弥散
模拟实验
heading face
multi-direction whirling air curtain
dust separation wind flow field
dust diffusion
simulation experiment
