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1、第40卷第6期燃料化學(xué)學(xué)報(bào)Vo1.40NO.62012年6月JournalofFuelChemistryandTechnologyJun.2012文章編號(hào):0253—2409(2012)06-0648-07煤快速熱解焦的微觀結(jié)構(gòu)對(duì)其氣化活性的影響陳路,周志杰,劉鑫,袁帥,王輔臣(華東理工大學(xué)煤氣化教育部重點(diǎn)實(shí)驗(yàn)室,上海200237)摘要:在滴管爐內(nèi)對(duì)中國(guó)三種不同煤階的典型煤種在800~1400oC進(jìn)行快速熱解實(shí)驗(yàn),利用XRD和氮?dú)鈿怏w吸附法對(duì)所得煤焦進(jìn)行微晶結(jié)構(gòu)和孔隙特征分析,在熱重分析儀上進(jìn)行CO氣化反應(yīng)活性的測(cè)定,研究不同熱解溫度
2、煤焦結(jié)構(gòu)特性與氣化活性之間的關(guān)系。結(jié)果表明,隨著熱解溫度的升高,內(nèi)蒙古褐煤焦和神府煙煤焦的比表面積在1200℃達(dá)到極大值,但氣化活性卻相對(duì)較低;遵義無(wú)煙煤焦在800~1200℃氣化活性逐漸提高,但比表面積在900oc達(dá)到極大值,表明煤焦比表面積與氣化活性不存在嚴(yán)格關(guān)聯(lián)。煤焦碳微晶結(jié)構(gòu)變化所反映出煤焦石墨化進(jìn)程與煤焦氣化活性隨熱解溫度的變化具有一致的變化趨勢(shì),表明快速熱解煤焦的碳微晶結(jié)構(gòu)變化對(duì)煤焦氣化活性的影響更大。關(guān)鍵詞:滴管爐;碳微晶結(jié)構(gòu);比表面積;氣化活性中圖分類(lèi)號(hào):TQ54文獻(xiàn)標(biāo)識(shí)碼:AEffectofmicrostructur
3、eofrapidpyrolysischaronitsgasificationreactivityCHENLu,ZH0UZhi-jie。LIUXin,YUANShuai,WANGFu.chen(KeyLaboratoryofCoalGasifcation,MinistryofEducation,EastChinaUniversityofScience&Technology,Shanghai200237,China)Abstract:Toinvestigatetherelationshipbetweenmicrostructureofra
4、pidpyrolysischarsunderdifferenttemperaturesandtheirgasificationreactivities,threeChinesetypicalcoalswithdifferentrankswerepyrolyzedinadrop.tubefurnaceat800—1400℃.ThestructureofcharsobtainedwascharacterizedbyusingXIfXraydiffraction)andN2gasadsorptionmethod,andtheCO2gasif
5、icationreactivityofcharswasexaminedusingTGA(thermogravimetricanalyzer).Theresultsshowthatthespecificsurfaceareaincreaseswiththeincreasingofpyrolysistemperatureandreachesmaximumvalueat1200oC.whilethegasificationreactivityofNMligniteandSFbitumitecharslowersrelatively.Theg
6、asificationreactivityofZYanthracitecharincreasesgraduallyat800l200oCwhilethemaximumvalueofspecificsurfaceareaappearsat900oC.Itisprovedthatthereisnota.goodcorrelationbetweenthespecificsurfaceareaandthegasificationreactivityofchars.However,thechangeofgasificationreactivit
7、yofthreecharswithincreasingpyrolysistemperatureisinaccordantewiththedevelopmentofcarboncrystallitestructureofcharswhichreflectsthegraphitizafionprogressofchars.Itisconcludedthatthechangeofcarboncrystallitestructureofcharshasagreaterinfluenceonthegasificationreactivityof
8、charsmadebyrapidpyrolysis.Keywords:drop—tubefurnace;carboncrystallitestructure;specificsurfacearea;gasificatio