摘要
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.
The conventional adding device adopts water jet to suck foaming agent used for foam technology, which has drawbacks of large pressure loss and high pressure demand on water power. Therefore, a new pneumatic jet device applied for adding foaming agent was proposed based on the field conditions of the heading face in underground coal mines, where compressed air is sufficient but water pressure is low. Experimental results showed that the absorption a- mount of the new device increased with the outlet pressure decreasing, reaching a maximum value when the outlet pressure decreased to a certain degree. The increase of inlet pressure raised the absorption amount of foaming agent, while the increasing range became small. High inlet air pressure was in demand for obtaining a higher critical outlet pressure. On the super- critical conditions, the less the absorption amount was, the larger the critical outlet pressure was, making a higher driving pressure. Field application indicated that adopting the pneumatic jet device ensured a reliable mini flow addition of foaming agent used for foam dust suppres- sion, which reduces the foam technology cost and simplifies the foaming system. The foam dust suppression efficiency was as high as 82. 3% ～ 87. 9 % when used in high-strength rock tunneling. It was much higher than that of water spraying, achieving a good dust suppression effect, which manifests that the new device has a strong applicability in underground coal mines.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2015年第2期214-219,共6页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(51474216)
国家自然科学基金煤炭联合基金重点项目(51134020)
关键词
压风
射流器
发泡剂
吸液量
降尘
compressed air
jet device
foaming agent
absorption amount
dust suppression
