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1、StudyonpyrolysisforricestrawbehaviorandmodelconstructionofpyrolysisZhaochuangJiangenchen※ChenliangguangXiongleiming(EngineeringcollegeinsouthChinaAgricuralUniversity,guangzhou,China,510642)Email:※ecjiang@scau.edu.cn,zhao020057@126.com,Abstract:ByusingSTA449CJupit
2、er?thermogravimetricapparatus,effectoftheheatingrateandratioofaddingcatalystforricestrawwerestudied,whichshowedthatastheheatingratesincreased,weightlosswaslittle,weightlossratechangedheavily,;afteraddingcatalyst,retentionrateincreased(yieldofcarbonrised),activati
3、onenergyofpyrolysislowered,asratioofaddingcatalystincreased,activationenergyofpyrolysisrised,activationenergylowered,thenrised.ByMalekmethod,itcouldbedeterminedthatpyrolysisprocessofricestrawaccordedwiththerandomnucleationandlatergrowth.Byestimatingtrialdata,pyro
4、lysisreactionseriesofricestrawwas0.4,pyrolysisreactionseriesofricestrawplus10%catalystwas0.46,pyrolysisreactionseriesofricestrawplus15%catalystwas0.42.Byestimatingpyrolyticreactionofricestraw,whichwere184.07kJ/mol,158.70kJ/moland172.60kJ/mol,andinaccordwithCoatsa
5、ndRedfernmethod.Correctnessandapplicabilityofthemechanismmodelwerefurtherconfirmedbypyrolysisofricestrawsegmentmodelcalculation,reliabilityofthemechanismmodelwasvetifiedbyKineticssoftware.Keywords:pyrolysis,catalyst,mechanism,kinetic,pyrolysisparameters,稻稈的熱解特性及熱
6、解模型建立趙創(chuàng)蔣恩臣※陳亮廣熊磊明華南農(nóng)業(yè)大學(xué)工程學(xué)院,廣州,中國(guó),510642Email:※ecjiang@scau.edu.cn,zhao020057@126.com,摘要:該文采用耐馳STA449CJupiter?同步熱重分析儀,研究了升溫速率和添加催化劑比例對(duì)稻稈的的熱解過程的影響。結(jié)果表明,隨著升溫速率的增大,失重量變化不明顯,但失重速率變化顯著;添加催化劑后,熱解的殘留率增大,即焦炭產(chǎn)率上升,隨著催化劑添加量的增加,活化能先降低后增加。用Malek法確定其熱解機(jī)理模型為隨機(jī)成核和隨后成長(zhǎng),稻稈熱解的反應(yīng)級(jí)數(shù)n
7、為0.4,加入10%催化劑的稻稈的反應(yīng)級(jí)數(shù)n為0.46,加入劑15%催化劑的稻稈的反應(yīng)級(jí)數(shù)n為0.42。通過稻稈熱解反應(yīng)公式擬合的方法得到的主熱解階段活化能與Coats和Redfern法的計(jì)算結(jié)果相符,其活化能依次為184.07kJ/mol、158.70kJ/mol和172.60kJ/mol。通過稻稈熱解的分段模型計(jì)算驗(yàn)證其熱解機(jī)理的正確性及適用性,用Kinetics軟件驗(yàn)證其模型的可靠性。關(guān)鍵詞:熱解,催化劑,反應(yīng)機(jī)理,動(dòng)力學(xué),1引言對(duì)化石燃料急劇的需求和環(huán)境問題的擔(dān)憂,促使人們對(duì)可再生能源之一的生物質(zhì)能廣泛關(guān)注,其在
8、整個(gè)能源結(jié)構(gòu)中占有重要地位。可以將生物質(zhì)通過不同的方式和機(jī)理轉(zhuǎn)化成生物質(zhì)燃料,例如,H2,CH4,乙醇或者氣化燃?xì)獾萚1-4]。燃?xì)饪梢杂米鲃?dòng)力裝置燃料,輸出電力或動(dòng)力,國(guó)外在生物質(zhì)發(fā)電方面已經(jīng)取得一些成就,國(guó)內(nèi)發(fā)展較晚,但是發(fā)展較快[5]。熱解是生物質(zhì)熱化學(xué)轉(zhuǎn)化技術(shù)之一,近些年受到了人們的廣泛關(guān)注[6-12]。熱解