234 / 2024-03-14 01:17:27

The optimal design method for the non-submerged jet fluidized mining process parameters

fluidized coal mining, lifting efficiency, jet pump, structure optimization, process matching

The matching of the coal breaking rate of the water jet and the slurry lifting rate of the jet pump are crucial to maintaining liquid level stability during non-submerged fluidized coal mining. To provide guidance for this process, we studied the matching of the two processes. In this paper, we used the Di Felice drag force model to obtain the particle migration velocity in the jet pump. And the relative slip velocity between the particle and the fluid was used to revise the fundamental equation of the liquid-solid jet pump. Based on the modified performance equation of the liquid-solid jet pump, the structure size of the jet pump corresponding to close to the peak lifting efficiency is obtained. Then, we calculated the operation parameters of the coal breaking that match the lifting efficiency of the jet pump. In addition, a design method for the non-submerged jet fluidized mining process parameter is proposed based on these research results. Finally, we used the proposed design method to design the fluidized mining process parameters, including jet pump structure and operation parameters of coal breaking, for the site conditions of the 3# coal seam in Shiquan Coal Mine. Numerical simulation results indicate that the lifting efficiency of the jet pump obtained by this design method is nearly 31.1%. These research results provide theoretical guidance for applying fluidized mining technology.