露天矿潜孔打钻粉尘浓度分布规律数值模拟

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1、第30卷第3期深圳大学学报理工版Vol.30No.32013年5月JOURNALOFSHENZHENUNIVERSITYSCIENCEANDENGINEERINGMay2013【环境与能源/EnvironmentandEnergy】露天矿潜孔打钻粉尘浓度分布规律数值模拟蒋仲安，姜兰，陈举师北京科技大学土木与环境工程学院，教育部金属矿山高效开采与安全重点实验室，北京100083摘要:根据气固两相流原理建立潜孔打钻三维几何模型，利用Fluent模拟不同边界条件下打钻时粉尘浓度的分

2、布规律，并与现场实测数据比较，模拟结果与实测数据基本一致．研究表明，粉尘浓度在孔口水平取得最大值，沿自然风流方向渐减，且在钻机侧面及后部有粉尘积聚现象;钻具转速对粉尘浓度影响不明显;当钻孔深度为10m、风速为1.4m/s及工作风压为0.98MPa时，粉尘浓度最小;捕捉壁面条件下粉尘浓度较反弹壁面低许多．针对潜孔打钻产尘的特点，建议在钻孔位置采取湿式除尘效果更佳．关键词:安全技术;露天矿;潜孔打钻;湿式除尘;粉尘浓度;气固两相流;几何模型;数值模拟;尘肺病中图分类号:TD714.2文献标志码:Adoi:10．3724/SP．J．1249．2013．03313Numeric

3、alsimulationofdustconcentrationdistributionregularitiesofdown-the-holedrillinginopen-pitmineJiangZhongan，JiangLan，andChenJushiKeyLaboratoryofMinistryofEducationofChinaforEfficientMiningandSafetyofMetalMines，SchoolofCivilandEnvironmentalEngineering，UniversityofScienceandTechnologyBeijing

4、，Beijing100083，P．R．ChinaAbstract:Accordingtotheprinciplesofgas-solidtwo-phaseflow，a3Dgeometricmodelofdown-the-holedrillingwasestablished．Afterthat，dustconcentrationdistributionofdifferentboundaryconditionsweresimulatedbyusingsoftwareFluent．Theresultsfoundthatthesimulationresultswerebasic

5、allyconsistentwiththemeasureddata．Also，theresearchshowedthat:thedustconcentrationobtainedthemaximumvalueinthepositionoftheorificelevel，thenitgraduallyreducedalongthedirectionofnaturalwindwhilesomedustaccumulatedinthesideandrearoftherig．Inaddition，dustconcentrationwasnotobviouslyeffectedb

6、ydrillingspeed，anditachieveditsminimumvalueunderconditionofdrillingdepthin10m，windspeedin1.4m/s，andairpressurein0.98MPa．What'smore，dustconcentrationundertrap-wallconditionismuchsmallerthanthereflect-wall．Accordingtocharacteristicsofdustproductionofdown-the-holedrilling，wetdustremovalmeas

7、urestakeninthedrillingpositionshouldbestrengthenedinordertoachievebettereffect．Keywords:safetytechnology;open-pitmine;down-the-holedrilling;wetdustremovalmeasure;dustconcen-tration;gas-solidtwo-phaseflow;geometricmodel;numericalsimulation;pnenmoconiosisReceived:2013-01-30