双锲金属铰接顶梁临时支护在掘进巷道中的应用

针对大淑村矿174404工作面上半段配巷掘进期间沿断层前进顶板凹凸不平,前探梁临时支护无法组织有效的快速掘进的问题,经过现场实践和理论论证,决定采用支护强度大的双锲金属铰接顶梁临时支护方式。实践表明,双锲金属铰接顶梁配合液压点柱的临时支护方式非常有效,与前探梁临时支护相比,在顶板破碎、不平时使用效果尤为突出,既有效支护了顶板,又提高了掘进效率,对掘进工作面快速掘进具有积极的借鉴意义。

Identification and Modeling of Froth to Spray Transition on Sieve Trays

The transition from froth to spray regime on sieve trays was experimentally studied in an air/water simulator with 300mm diameter. It has been found that the regime transition occurs as the clear liquid height is equal to the residual pressure drop on the trays. A convenient and accurate technique was proposed for determination of the regime transition point. Based on analysis of the transition process at a sieve hole, a new formula which can be used to correlate the experimental results was provided.