冲击破岩掘进机喷雾降尘效率因素与改进研究

Study on Factors Influencing Efficiency and Improvement of Spray Dustfall For Impacting and Crushing Rock Roadheader

为了提高冲击破岩掘进机喷雾降尘效率、改善工作面环境和安全状况,建立了适合分析影响降尘效率因素的数学模型,利用Matlab仿真分析影响降尘效率的主要因素。降尘效率随粉尘颗粒变大、喷嘴雾化角度减小、喷雾压力加大、喷嘴直径增大而提高,但对于较大尘粒,降尘效率变化不明显。在此基础上,提出参数改进方案,仿真结果表明,参数改进后,对2μm以上尘粒的降尘效率达80%以上,是改进前的1.63倍。通过建立DPM离散模型,运用Fluent软件对喷雾仿真显示,改进前喷雾覆盖不均匀,工作面雾粒分布分散;改进后的雾化角度小,喷雾集中于产尘点,便于在粉尘扩散前捕集降尘,且能减少水的消耗,降尘效果明显。

In order to increase the spray dustfall efficiency, and improve the working environment and safe con- dition of the impacting and crushing rock roadheader, a mathematical model suitable for analyzing the factors to affect the efficiency of dustfall is established. The main factors influencing the efficiency of dustfall are simula- ted and analyzed by Matlab program. The results show that for smaller dust particles, the dustfall efficiency is improved with the decrease of nozzle spray angle and the increase of dust particles, spray pressure and nozzle diameter. For bigger dust particles, the change of dustfall efficiency is not obvious. From this, the parameter im- provement scheme is proposed. The simulation results show that for the dust particles of bigger than 2 μm, the dustfall efficiency is more than 80% after parameters improvement, which is 1.63 times of the original one. By establishing DPM discrete model and using Fluent software on the spray, the simulation shows that the previous one covers unevenly and the fogdrop distributes dispersedly. After parameters are improved, the atomization an- gle is smaller and the spray focuses on the dustpoint, which is easy to capture dust before dust particles spread, and can reduce the water consumption, the dustfall effect is more obvious.