涼水井礦綜采面粉塵運移規(guī)律數(shù)值模擬研究
[Abstract]:Coal dust not only affects the economic benefits of coal mines, but also endangers the physical and mental health of coal miners. The most dust-producing place in every coal face is the fully mechanized coal face. This paper takes 42112 fully mechanized face of Liangshui Coal Mine as the research object, mainly aiming at the top and bottom drum, hydraulic support and transfer point of coal mining machine. The FLUENT numerical simulation method is used to study the law of air flow distribution and air-flow dust migration. Combined with the field measured data, the dust reduction measures are put forward according to the dust law simulated in different working procedures. The main research results of this paper are as follows: (1) through FLUENT numerical simulation, the law of wind flow distribution in fully mechanized mining face is obtained, that is, wind speed becomes smaller in hydraulic support because of the obstruction of hydraulic support. In the coal mining machine, the wind speed increases due to disturbance. (2) the source of dust produced in fully mechanized coal mining face is subdivided into three parts. The dust movement law and dust concentration distribution law of fully mechanized coal face are obtained when the three dust sources are open, that is, the dust is continuously deposited along the process from the dust production source, and most of the dust is captured by the working face and the bottom plate. A small part of dust diffuses into the sidewalk space with the wind flow and is discharged from the working face. (3) when coal miner produces dust separately, the law of air-flow and dust migration is obtained, and the dust concentration changes from large to small from the machine road to the sidewalk. The dust produced by coal cutting in the upper drum will move to the sidewalk, but the dust produced by the lower drum will not move to the sidewalk. (4) when the hydraulic support produces dust alone, the law of air-dust migration is obtained, and the dust concentration decreases along the path. The concentration of 10m-20m dust under the hydraulic support affects the breathing zone and most of the dust deposited on the floor. (5) the law of air-flow and dust migration is obtained when the dust is produced separately at the transfer point. Due to the disturbance of the air flow, the dust concentration first increases and then decreases, and the dust concentration reaches the maximum about 15 m after the transfer point. Combined with the research results, the method of dust reduction in mining face by using swirl negative pressure dust removing fan is put forward, and the research result has practical guiding significance to the field.
【學位授予單位】:西安科技大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TD714.2
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