1. Key Laboratory of Metallurgical Equipment and Control Technology, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; 2. Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; 3. Wuhan Branch of Baosteel Central Research Institute (Research and Development Center of Wuhan Iron and Steel Co., Ltd.), Wuhan 430081, Hubei, China
Abstract:To improve the dust removal efficiency of hot mill and reduce dust pollution in hot mill site, the influence of air pressure and hydraulic pressure of two-phase atomization dust removal technology on fog field parameters was studied. Firstly, the numerical simulation of fog field was carried out on the basis of theoretical analysis. Secondly, an experimental platform was set up to conduct spray experiments, which verified the accuracy of the model. The influence for pressure combination of different gas and liquid phases on fog field parameters was analyzed, and the influence of fog droplet size was emphatically analyzed. The results show that the droplet size decreases with the increase of gas pressure and liquid pressure. The droplet size is mainly affected by gas phase pressure and the change rate decreases with the increase of gas phase pressure. At the pressure of 0.6 MPa and hydraulic pressure of 0.55 MPa, the fog field parameters had a better effect on the removal of iron oxide dust. Field application showed that, with this parameter combination, the average dust concentration droped from above 369.1 to below 23.9 mg/m3 at the top of the rack exit gate 3 m from the rack, and the dust removal rate reached 93.5%, indicating a good dust removal effect.
Beck T W,Seaman C E,Shahan M R,et al. Open-air sprays for capturing and controlling airborne float coal dust on longwall faces[J]. Mining Engineering, 2018,70(1):42.
Simakov N N. Numerical simulation of the two-phase flow produced by spraying a liquid by a nozzle[J]. Technical Physics,2017,62(7):1006.
[14]
Vashahi F,Ra S,Yong C,et al. An experimental and CFD analysis of a two-phase flow air induction nozzle with agricultural application[C]// International Conference on Simulation and Modeling Methodologies. Nanjing: IEEE,2017:7.
[15]
MA Qing-xin,NIE Wen,YANG Shi-bo,et al. Effect of spraying on coal dust diffusion in a coal mine based on a numerical simulation[J]. Environmental Pollution,2020,264:114714.
[16]
FANG Xue-ming,YUAN Liang,JIANG Bing-you,et al. Effect of water-fog particle size on dust fall efficiency of mechanized excavation face in coal mines[J]. Journal of Cleaner Production,2020,254:120146.
[17]
LIU Qiang,NIE Wen,HUA Yun,et al. Investigation of efficient dust control strategy for construction tunnels:Ventilation system's implications for cleaner production[J]. Building and Environment,2020,180: 107032.
Jiang X, Siamas G A, Jagus K, et al. Physical modelling and advanced simulations of gas-liquid two-phase jet flows in atomization and sprays[J]. Progress in Energy and Combustion Science, 2010, 36(2):131.