微波在煤泥低温脱水提质的应用研究.pdf

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1、·应用工艺研究·微波在煤泥低温脱水提质的应用研究姚腾(南京三乐电子信息产业集团有限公司，江苏南京211800)ApplicationofMicrowaveinResearchofCoalSlimeLow‘TemperatureDehydrationUpgradingYAOTeng(NanjingSanleElectronicInformationIndustryGroupCo．Ltd，Nanjing211800，China)Abstract：Usingthedehydrationupgradingtothecoalslimeinlowtemperaturebymicr

2、owaveenergy，thispaperdiscussestheinfluencefactorsofmicrowavedrying，analysethemicrowavedryingontheprop—ertiesofcoalslimeandseekthewaysofcoalslimeresourceutilization．Theeffectsofmicrowavepower，time，andslimeshape，qualityonmicrowavedryingaresignificant．Bythemicrowaveirradiation，thee—vaporat

3、ionprocessofmoistureincoalcanbedividedintothr6estages：coalheating，externalmoisturere—duction，internalmoisturereduction，thusdryingfaster．Dryweightof200g，25moisturecontentofthecoalsampletakeslessthan700S．Experimentshowsthatdryingafter200S，coalsampletemperaturecanreach11O℃；After600S，thetem

4、peraturecanreach240℃．Notonlyevaporatethewater，alsodis—chargeofthevolatilecomponent．Coalslimehasbetterdehydrationresultinmicrowavelowtemperatureanddryingconditions，andthemoisturecontentandcalorificvalueincreaserateofthedriedslimealla—chievedtheexpectedgoals，provedthatthefeasibilityofthea

5、pplicationofmicrowaveindryingandupgra—dingcoalslime．Aftercoalslimedewateringbymicrowave，themineralsaltinternalcoalslimewillgatheronthesurfaceofcoalslimeandforma“shell”becauseofthespecialheatandmasstransfermechanismsinthematerialthatheatedbymicrowave．Sothecoalwillnoteasytobebrokentopowde

6、randthewaterab—sorptionisnotobviouswhichwillcontributetothesubsequenttransportandutilization．Keywords：Microwaveenergy，Lowtemperaturedehydration，Coa1slimeupgrading摘要：利用微波能对煤泥低温脱水提质，探讨了微波干燥的影响因素；分析了微波干燥对煤泥性质的影响；寻求煤泥资源化利用的途径。微波时间、功率和煤泥形状、质量对微波干燥效果影响显著。在微波作用下，煤中水分的蒸发过程分三个阶段：煤加热，外在水分减少，内在水分减

7、少，因而干燥速度较快。烘干重量为200g，水分25的煤样所需时间不超过700s。试验表明：干燥200s后，煤样温度可达110℃；600s后，温度可达240℃。不仅蒸发了水，也排出了挥发成分。煤泥在微波低温干燥条件下具有较好的脱水效果，干燥后煤泥的含水率和热值提升幅度均达到了预期目标，证明了微波在煤泥干燥提质方面应用的可行性。煤泥微波脱水后，由于微波加热在加热物料内形成的特殊传热传质机理，煤泥内部的矿物盐等会在煤泥表面积聚，形成“硬壳”，煤泥不易粉化、破碎，且水分回吸不明显，有助于后续运输和利用。关键词：微波能；低温脱水；煤泥提质中图分类号：TM924