褐煤自燃特性热重实验及动力学分析-论文.pdf

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1、第43卷第6期热力发电Vo1．43NO．62014年6月THERMALP0WERGENERAT10NJun．2014褐煤自燃特性热重实验及动力学分析张斌，刘建忠，赵卫东。，袁绍，王智化，周俊虎，岑可法(1．浙江大学能源清洁利用国家重点实验室，浙江杭州310027；2．西安热工研究院有限公司，陕西西安710032)[摘要]对锡盟褐煤和印尼褐煤进行热重实验，并与大同烟煤、平顶山烟煤、神华低灰烟煤、阳泉无烟煤等煤样进行了对比。通过分析热重曲线，将煤从吸氧氧化到燃烧的整个过程分为物理吸附、水分蒸发失重、吸氧增重、煤受热分解、燃烧和燃尽6个阶段，并得到各阶段的特征温度点。结

2、果表明，2种褐煤的自燃倾向明显大于其他4种烟煤和无烟煤。通过Coats—Redfern积分法研究煤样的氧化燃烧动力学特性，计算煤样的活化能，得到6种煤的氧化过程属于一级化学反应，且褐煤自燃倾向性较强；煤样粒度越小，褐煤自燃倾向性越强；随着氧气浓度的增大，煤样更易自燃。[关键词]褐煤；热重实验；特征温度；自燃倾向性；动力学分析；活化能[中图分类号]TQ530[文献标识码]A[文章编号]1002—3364(2014)06—0071—06[-DOI编号]10．3969／j．issn．1002—3364．2O14．06．071Thermogravimetricexperi

3、mentsanddynamicanalysisonspontaneouscombustioncharacteristicsofligniteZHANGBin，LIUJianzhong，ZHAOWeidong，YUANShao，WANGZhihua，ZHOUJunhu，CENKefa(1．StateKeyLaboratoryofCleanEnergyUtilization，ZhejiangUniversity，Hangzhou310027，China2．Xi'anThermalPowerResearchInstituteCo．，Ltd．，Xi'an710032，Ch

4、ina)Abstract：ThermogravimetricexperimentsonXimengligniteandIndonesialignitewerecarriedout，andtheresultswerecomparedwiththatoftheDatongbituminouscoal，Pingdingshanbitu—minouscoal。ShenhualOWashbituminouscoalandYangquananthracite．ByanalyzingtheTGandDTGcurves，thewholeprocessfromcoaloxidati

5、ontocoalcombustioncouldbedividedintosixstages：physicaladsorption，waterevaporationwithlosingweight，absorptionofoxygenwithin—creasingweight，thermaldecomposition，combustionandburningout．Thecharacteristictempera—turesofeachstagewereobtained．Theresultsshowthat，thetendencyofspontaneouscombu

6、stionoftheabovetwolignitewassignificantlyobviousthanthatoftheotherfourbituminouscoalandanthracite．Coats—Redfernintegralmethodwasusedtoanalyzethesamplesoxidativecombustiondynamiccharacteristics．Moreover，activationenergyofthesixcoalsampleswascalculatedtoana—lyzethetendencyofspontaneousc

7、ombustionofcoa1．Thecalculationresultsshowthat，theoxida—tionprocessofthesixcoalsamplesbelongedtothefirst—orderreaction，andthetendencyofspon—taneouscombustionofthetwolignitecoalwasgreater．ThetendencyofspontaneouscombustionofXimenglignitewasaffectedbyparticlesizeandoxygendensity．Analysis

8、shows