带式输送机尾粉尘逸散治理技术研究
发布时间：2018-07-26 08:39
【摘要】：为解决选煤厂输煤系统机尾粉尘污染问题,采用计算流体力学滑移网格技术与离散相模型的粒子跟踪技术相结合的新算法,研究输煤皮带运行中机尾粉尘颗粒的逸散现象,并自主设计一种密封式机尾集尘罩。分析结果表明,粘附在输煤皮带表面的浮尘是机尾的发尘源,滚筒离心力和风流剪切力是尘源飞扬的动因,煤粒之间的摩擦与碰撞产生的高动能细粉尘颗粒在滚筒处扩散;密封式机尾集尘罩能够完全阻隔机尾粉尘向作业空间扩散,漂浮起来的细粉尘颗粒在碰到壁面后慢慢反向沉降,而粗粉尘颗粒在横向运行一段时间后也自由沉降。现场实践表明,储煤仓106暗道机尾采用密封式集尘罩后,全尘与呼吸性粉尘的降尘率分别达到93.09%和88.92%。
[Abstract]:In order to solve the dust pollution problem of coal conveying system in coal preparation plant, a new algorithm combining the sliding grid technique of computational fluid dynamics and the particle tracking technique of discrete phase model was used to study the phenomenon of dust particles in the tail of coal conveyer belt. And the design of a sealed tail dust cover. The results show that floating dust adhered to the surface of coal conveyer belt is the dust source of the tail, the centrifugal force of drum and the shear force of wind flow are the driving forces of dust source flying, and the high kinetic energy fine dust particles produced by friction and collision between coal particles are diffused in the drum. The sealed tail dust collecting cover can completely block the dust diffusion from the tail to the working space. The fine dust particles floating up slowly reverse after touching the wall, while the coarse dust particles are also settled freely after a period of transverse operation. The field practice shows that the dust reduction rate of the whole dust and respiratory dust reaches 93.09% and 88.92% respectively after the sealed dust collecting cover is adopted at the tail of 106 dark road of coal storage bunker.
【作者单位】： 辽宁工程技术大学安全科学与工程学院;矿山热动力灾害与防治教育部重点实验室;
【基金】：国家自然科学基金资助(51274116)
【分类号】：TD528.1;TD714.4
本文编号：2145461
[Abstract]:In order to solve the dust pollution problem of coal conveying system in coal preparation plant, a new algorithm combining the sliding grid technique of computational fluid dynamics and the particle tracking technique of discrete phase model was used to study the phenomenon of dust particles in the tail of coal conveyer belt. And the design of a sealed tail dust cover. The results show that floating dust adhered to the surface of coal conveyer belt is the dust source of the tail, the centrifugal force of drum and the shear force of wind flow are the driving forces of dust source flying, and the high kinetic energy fine dust particles produced by friction and collision between coal particles are diffused in the drum. The sealed tail dust collecting cover can completely block the dust diffusion from the tail to the working space. The fine dust particles floating up slowly reverse after touching the wall, while the coarse dust particles are also settled freely after a period of transverse operation. The field practice shows that the dust reduction rate of the whole dust and respiratory dust reaches 93.09% and 88.92% respectively after the sealed dust collecting cover is adopted at the tail of 106 dark road of coal storage bunker.
【作者单位】： 辽宁工程技术大学安全科学与工程学院;矿山热动力灾害与防治教育部重点实验室;
【基金】：国家自然科学基金资助(51274116)
【分类号】：TD528.1;TD714.4
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