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After Blast Re-Entry Time for a Room and Pillar Operation

机译：爆炸重新入口时间后，房间和支柱操作

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The lowering of the pollutant concentration limits at the workplace subjects the mining industry to higher requirements for dilution; this situation is worsened with the current discussions within the European Union (EU) to set new stricter exposure limits for nitrogen oxides in the workplace. This is directly reflected in the performance of the mine ventilation system, which may need to be revised to meet the new standards. The after blast re-entry time, being inversely proportional to the threshold limits, will be higher for a lower limit. This in turn increases the down time for production from the blasted area. Numerical tools have been very useful in predicting the effectiveness of ventilation. This study aims at analysing the dilution time for NO_x gases from an ANFO blast in a room and pillar panel. The effect of changing the ventilation on the dilution time is studied next, which helps with the selection of a suitable ventilation system.
机译：在工作场所污染物浓度限制降低，采矿业对稀释的要求较高;随着欧盟（EU）的目前讨论，将这种情况恶化，以在工作场所中的氮氧化物中设置新的更严格的暴露限制。这直接反映在矿井通风系统的性能方面，这可能需要修改以满足新标准。在爆炸重新入口时间，与阈值限制成反比，将较低限制。这又增加了从爆破区域生产的停机时间。数字工具对于预测通风的有效性非常有用。本研究旨在分析房间和支柱板中ANFO爆炸的NO_X气体的稀释时间。接下来，研究了改变通气对稀释时间的效果，这有助于选择合适的通风系统。

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