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根据井下掘进面风量大、水压低的特点,提出了压风射流添加发泡剂的理念.实验表明,压风射流器吸液量随出口压力减小而增大,当出口压力减小到一定值后,吸液量达到最大值并维持不变;进口压力升高,吸液量增大,但增大的程度减小,且出口压力越高,达到超临界吸液所需的进口风压越大;射流器在超临界吸液时,吸液量越小,临界出口压力越大,装置驱动性能越强;压风射流器应用于煤矿井下泡沫降尘时,确保了发泡剂的小流量稳定添加,降低了泡沫成本,简化了系统操作,尤其适用于高强度硬岩巷道掘进降尘,泡沫降尘效率可达82.3%~87.9%,远高于水雾降尘效率,取得了理想的降尘效果.
According to the characteristic of large borehole pressure and low water pressure in borehole, the concept of adding foaming agent into the air jet is proposed.The experimental results show that the suction amount of air pressure jet increases with the decrease of outlet pressure, and when the outlet pressure decreases to a certain level Value, the maximum amount of liquid uptake and remain unchanged; inlet pressure increases, the amount of liquid absorption increases, but the increase decreases, and the higher the outlet pressure to achieve the supercritical fluid suction inlet pressure required The larger the liquid ejector is, the smaller the amount of liquid absorption is and the larger the critical outlet pressure is, the stronger the driving performance of the device is. When the air jet ejector is used to reduce the foam in the coal mine, the small flow rate of the foaming agent is ensured Stable addition reduces foam cost and simplifies system operation. It is especially suitable for tunneling and dust reduction in high-strength hard rock tunnels. The efficiency of foam dust reduction can reach 82.3% -87.9%, which is much higher than the efficiency of water mist dust reduction and achieve the ideal dust reduction effect.