【摘要】 为了合理选择常村煤矿综掘面除尘的通风方式,本文根据煤矿中常用的通风方式和气固两相流的理论,利用fluent非稳态的数值模拟方法来模拟压入式和长压短抽两种不同通风方式下常村煤矿掘进面粉尘的运移规律以及司机处粉尘浓度分布,并进行了现场实测验证。结果表明:对于粉尘运移模型,采用非稳态的求解器要比稳态的求解器更加精确;在长压短抽通风方式下,涡流对粉尘运移影响较大,可以通过调整风速和除尘风机的负压来减小涡流的影响区域;采用长压短轴的通风方式比压入式通风方式在数值模拟情况下,前者比后者掘进机前部的粉尘浓度降低了22.2%,通过现场实测得到其降低了31.6%,巷道中部粉尘的平均浓度可由508mg/m3下降到185mg/m3,降幅为63.6%,表明长压短抽通风方式数值模拟和现场实测都要优于压入式通风方式;此外,需要在掘进机的前面和回风侧增加除尘措施,以确保司机处的粉尘浓度符合标准。更多还原

【Abstract】 To achieve a reasonable dusting ventilation in Changcun mine,based on the ventilation mode commonly used in coal mine and the gas-solid two phase flow theory,this paper applies the fluent software of the unsteady numerical simulate method to simulating the excavating face dust migration and carries out on-site verification.The results show that compared with dust transport model,the transient solver is more accurate than the steady state;it can reduce the influence area of wind circulation to adjust the wind speed and the negative pressure of dust removal fan;comparing the long press and short smoke with the forced ventilation,the dust concentration near the machine in the former is 22%less than the latter in the numerical simulation,which reduces 31.6%;the average concentration of central roadway can be reduced from 508mg/m3 to 185mg/m3,the drop is about 63.6%.In addition it needs to add dust control measures in front of the machine and return air side to ensure that the dust concentration around the driver meets to the standard.更多还原