淹没射流破碎含瓦斯煤效率主控因素敏感性分析
Sensitivity analysis of main control factors for efficiency of submerged jet crushing coal containing gas
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摘要: 为了研究淹没射流条件下破碎含瓦斯煤效率的影响因素,展开了不同水射流冲击条件对破煤效率的影响研究,建立了水射流破碎含瓦斯煤流固耦合模型,以破煤深度、破煤体积为指标,考察了射流倾角、射流速度、喷嘴直径、初始靶距对破煤效率的影响。结果表明:淹没射流条件下,射流破煤过程初始阶段形成子弹状的破碎坑体,随着破煤的进行,破碎坑体直径增大,深度向下延伸;淹没射流条件下,破煤深度及破煤体积与射流速度、喷嘴直径变化成正相关,与初始靶距变化成负相关,煤体破碎坑体深度在射流与煤体相互垂直时达到最大值,破煤体积随射流倾角增加呈现先上升后下降再上升的趋势,在90°达到最大值;基于正交试验,得到不同射流参数对淹没射流破煤效率影响程度的主次顺序依次为: 射流倾角、射流速度、喷嘴直径、初始靶距。Abstract: In order to study the influencing factors of crushing efficiency of coal containing gas under submerged jet, the influence of different water jet impact conditions on coal crushing efficiency was studied, and the fluid solid coupling model of water jet crushing coal containing gas was established. Taking coal crushing depth and coal crushing volume as indexes, the effects of jet angle, jet velocity, nozzle diameter and initial target distance on coal crushing efficiency were investigated. The results show that: under the condition of submerged jet, bullet shaped crushing pit is formed in the initial stage of jet coal breaking process. With the process of coal breaking, the diameter of crushing pit increases and the depth extends downward; under the condition of submerged jet, the depth and volume of coal breaking are positively correlated with the change of jet velocity and nozzle diameter, and negatively correlated with the change of initial target distance, the depth of broken coal pit reaches the maximum value when the jet is perpendicular to the coal, and the broken coal volume increases first, then decreases and then rises with the increase of jet angle, reaching the maximum value at 90°; based on the orthogonal experiment, the primary and secondary order of theinfluence of different jet parameters on the coal breaking efficiency of submerged jet is as follows: jet inclination angle, jet velocity, nozzle diameter and initial target distance.
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