Abstract: In order to solve the problems that the air flow in the fully mechanized excavation face cannot effectively control
the dust in front of the roadheader and the air exhaust port cannot efficiently collect the dust into the dust removal fan,the
dust control and dust collection effect is not ideal and the dust pollution is serious,the dust removal effect is not ideal and the
dust pollution is serious. A new idea of collaborative dust reduction of air flow dust control and two-stage dust collection is proposed.
Through the efficient cooperation of air flow dust control device and dust collection device,as much dust as possible enters
the first-stage dust collection device,and the dust not captured by the first-stage dust collection device enters the secondstage
dust collection devicewith the air flow. Taking the fully mechanized excavation face of a mine in Northern Shaanxi as the
study example,the airflow dust control-two-stage dust collection system was designed,and the finite element calculation model
of the dust field of the system was established. The dust distribution law at the hidden danger position under the single parameter
change of dust control and two-stage dust collection was simulated and analyzed,and the reasonable value range of each parameter
was determined. In order to obtain the best dust control-two-stage dust collection collaborative dust reduction scheme,
based on the Box-Behnken principle,the experimental scheme under the comprehensive change of each parameter of the system
was designed. The numerical simulation results of each scheme were extracted as sample data,and the four parameters of the
right deviation angle of the outlet,the diameter of the outlet,the distance between the first-stage dust collection port and the
end,and the distance between the second-stage dust collection port and the end were used as independent variables. Based on
the Pareto optimal method,an optimization model with the dust concentration at the driver′s position and the average dust con
centration of the pedestrian breathing zone on the return air side as the dependent variables was established,and the model was
solved by the NSGA-Ⅱ algorithm to obtain the best dust control-two-stage dust collection collaborative dust reduction scheme
under different working conditions. In order to verify the effectiveness of the best dust control-two-stage dust collection collaborative
dust reduction scheme,a test platform for dust control-two-stage dust collection system was designed and built and tested.
The results show that under the condition of the longest distance from the outlet to the end (10 m),the dust concentration
at the driver′s position is reduced from 303. 19 mg/ m3 to 163. 28 mg/ m3,which is reduced by 46. 1%,and the average dust
concentration in the pedestrian breathing zone is reduced from 359. 68 mg/ m3 to 76. 33 mg/ m3,which is reduced by 78. 8%.
The dust reduction effect is remarkable.