综采工作面喷雾雾化规律与降尘技术研究

发布时间：2018-04-18 09:22

本文选题：综采工作面 + 雾滴粒径　；参考：《山东科技大学》2017年硕士论文

【摘要】：矿井粉尘是煤炭生产加工过程中的必然产物,为保障矿工健康及煤矿的安全、高效生产,就必须解决矿井人员作业区域粉尘浓度过高的问题。喷雾降尘技术是控制煤矿采掘工作面粉尘污染问题最为有效的技术途径之一,因此提高喷雾降尘效率,对煤矿安全生产具有重要的意义。本文主要采用了理论分析、实验室研究、数值模拟与现场应用等多种手段相结合的方法,主要研究内容及成果如下:研究喷嘴射流雾化及降尘机理,建立喷雾降尘数学模型,分析影响雾滴捕尘效果的主要因素。基于PDI技术利用相位多普勒激光干涉仪,优选宏观雾化特性较好的喷嘴进行喷雾雾化特性实验,并对优选喷嘴B2#的雾场雾滴粒径、雾滴速度等多种雾化特性因素的三维空间分布变化规律进行耦合分析,得出:喷雾压力为8MPa时,距离喷嘴口 400mm-1000mm的雾场区间范围内,雾滴SMD在60μm～90μm范围内,雾滴粒径主要分布在30μm～120μm之间,雾滴轴向速度值在20m/s～30m/s之间,并进行喷雾场区间降尘实验,确定了喷雾雾场的最佳降尘区间。利用FLUENT软件,首先对定空间内喷嘴喷雾的气-雾两相流场进行了数值模拟,并在此基础上研究喷嘴在综采工作面现实工况下的降尘雾场形成效果,对采煤机外喷雾、液压支架架间喷雾等雾化降尘技术进行数值模拟,揭示综采工作面降尘雾场特征及喷雾降尘机制。结合喷嘴雾场最佳降尘区间的结论,对工作面现有的降尘技术进行优化和改进,研发了可包裹采煤机滚筒区域的新型采煤机外喷雾降尘装置,以及降尘雾场可覆盖采煤区域全断面并实现负压吸尘净化的液压支架架间喷雾引射除尘装置,并在石泉煤矿30106工作面进行了现场应用,工作面全尘与呼尘平均降尘率分别达到了 88.1%和85.0%,实现综采工作面粉尘的有效沉降。
[Abstract]:Mine dust is an inevitable product in the process of coal production and processing. In order to ensure the health of miners and the safety and efficient production of coal mines, it is necessary to solve the problem of excessive concentration of dust in the working area of mine personnel.Spray dust control technology is one of the most effective ways to control dust pollution in coal mining face, so it is of great significance to improve the efficiency of dust control in coal mine.This paper mainly adopts the methods of theoretical analysis, laboratory research, numerical simulation and field application. The main research contents and results are as follows: the atomization and dust control mechanism of nozzle jet is studied, and the mathematical model of spray dust reduction is established.The main factors influencing the dust trapping effect of droplets are analyzed.Based on phase Doppler laser interferometer, the spray atomization characteristics of the nozzle with good macroscopic atomization characteristics were selected and the droplet diameter of the atomized field of the optimized nozzle B2# was studied.The coupling analysis of three dimensional spatial distribution of atomizing characteristic factors such as droplet velocity is carried out. When the spray pressure is 8MPa, the droplet SMD is in the range of 60 渭 m ~ 90 渭 m in the range of fog field from the nozzle mouth 400mm-1000mm.The droplet diameter is mainly distributed in the range of 30 渭 m ~ 120 渭 m, and the axial velocity of droplet is between 20m/s~30m/s.By using FLUENT software, the gas-fog two-phase flow field of nozzle spray in fixed space is numerically simulated, and on the basis of this, the formation effect of dust mist field of nozzle in actual working condition of fully mechanized coal mining face is studied, and the outside spray of coal mining machine is also studied.In order to reveal the characteristics of dust dust field and the mechanism of spray dust reduction in fully mechanized coal mining face, the atomization and dust control technology such as spray between supports are numerically simulated.Combined with the conclusion of the optimal dust control section of the nozzle fog field, the existing dust control technology in the working face is optimized and improved, and a new type of dust control device outside the shearer is developed, which can be wrapped in the drum area of the shearer.And the dust removal device between the hydraulic support frame which can cover the whole section of coal mining area and realize negative pressure dust cleaning is applied in the 30106 working face of Shi Quan Coal Mine.The average dust reduction rate of working face is 88.1% and 85.0%, respectively, which realizes the effective deposition of dust in fully mechanized coal mining face.
【学位授予单位】：山东科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD714.4

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