Optimal wind field regulation rules under different cutting methods in fully mechanized face

With the current local ventilation method at fully mechanized heading face,the airflow state of the air outlet cannot be dynamically adjusted according to the actual ventilation requirements,causing serious dust and gas accumulation in the roadway.The analysis of the optimal wind field regulation rules is to reduce the dust and gas concentration effectively.Orthogonal test methods and numerical simulations of flow fields were used to analyze the distribution rules of wind flow control parameters on wind speed,gas,and dust fields under different cutting methods.A large number of sample data were obtained to establish an initialized decision information system about wind flow control parameters and wind speed,gas,and dust concentrations.It was processed by the K means algorithm to discretize and merge the protocols and a discretization decision information system was established.Based on granular computing and Matlab software,an intelligent algorithm and parameterization program for obtaining wind field regulation rules was developed.The wind field control rule acquisition method and parameterization program were used to analyze and establish the optimal wind field control rule of the fully mechanized heading face of the S1212 rubber roadway in the Ningtiaota Mine.The self developed wind flow control device was used for underground testing and verification.The results show that after using the optimal wind field regulation rules,under the premise that the wind speed in the roadway is in the range of 0.25-4.00 m/s and the gas concentration in the dead corner area is less than 1%,when the air outlet is 5 m away from the end surface,the dust concentration on the return air side can be reduced by up to 43% and be reduced by up to 38% at the driver.When the air outlet is 10 m away from the end surface,the dust concentration on the return air side can be reduced by up to 15% and be reduced by up to 37% at the driver,which verifies the effectiveness and feasibility of the wind field regulation rules and provides a new method and theoretical basis for the fine dynamic regulation of the wind field at the fully mechanized heading face.