The diffusion of dust in a fully-mechanized mining face with a mining height of 7 m and the application of wet dust-collecting nets
The diffusion of dust in a fully-mechanized mining face with a mining height of 7 m and the application of wet dust-collecting nets
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DOI：
10.1016/j.jclepro.2018.09.009
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发表时间：
2018-12-20
影响因子：
11.1
通讯作者：
Liu, Zhiqiang
中科院分区：
文献类型：
--
作者：
Chen, Dawei;Nie, Wen;Liu, Zhiqiang
为了更深入地了解7 m采高综采工作面多源粉尘的扩散和污染规律，设计有效的防尘措施。以补连塔矿22305综采工作面为研究对象，采用CFD-Fluent软件对采场步行街呼吸带粉尘浓度分布进行数值模拟。数值模拟结果表明：由于进风拐角处的漏风，采空区内的风流呈螺旋状运动，然后由于平行于采煤机的液压支架之间的漏风，风流在采空区内稳定运动;采煤机落煤、支架运动过程中产生的粉尘叠加在采煤机背风侧，形成粉尘带，在采煤机背风面0-120 m处，呼吸高度粉尘浓度超过1700 mg/m3，且沿程沿着无明显沉降;采高0 ~ 1.55 m和5.55 ~ 6.80 m范围内的粉尘浓度高于采高1.55-5.55 m范围内的粉尘浓度。为此，设计了一种新型的除尘系统，包括采区湿式卷帘集尘网和回风巷全断面湿式集尘网。现场测试结果表明，该系统的总除尘效率为69.6%。(C)2018爱思唯尔有限公司版权所有。
In order to gain a more in-depth knowledge of the diffusion and pollution rules of dust from multiple sources in a fully-mechanized mining face with a mining height of 7 m, and design some effective dust suppression measures. This study focuses on the No. 22305 fully-mechanized mining face in the Bulianta Mine, and employs CFD-Fluent software for conducting numerical simulations on the dust concentration's distribution in the respiratory zone on the footway. According to the results of the numerical simulations: due to an air leakage around the air-intake corner, the airflows in the goaf moved in a spiral pattern; they then moved stably in the goaf because of an air leakage between the hydraulic supports parallel to the coal cutter; the dust produced in the coal cutting and support movement processes were superposed on the leeward side of the coal cutter, and a dust belt, with a length of approximately 36 m and a concentration of over 2850 mg/m(3), was formed; at 0-120 m on the leeward side of the coal cutter, the dust concentration at the respiratory height exceeded 1700 mg/m(3) and exhibited no significant settlement along the way; and dust concentrations at the mining height range of 0-1.55 m and 5.55 m-6.80 m were higher than those at a mining height range of 1.55-5.55 m. Accordingly, a novel dust removal system, comprising wet roller-shutter, dust-collecting nets in the coal mining area and full cross-section, wet dust-collecting nets in the return airway, was designed. The field measurement results show that the overall dust-removal efficiency of this system was 69.6%. (C) 2018 Elsevier Ltd. All rights reserved.