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1、第41卷第9期華中科技大學(xué)學(xué)報(bào)(自然科學(xué)版)Vo1.41NO.92013年9月J.HuazhongUniv.ofSci.&Tech.(NaturalScienceEdition)Sep.2O13污水污泥半焦CO2氣化反應(yīng)特性的研究解立平王俊馬文超。曹占平(1天津工業(yè)大學(xué)環(huán)境與化學(xué)工程學(xué)院,天津300387;2天津大學(xué)a環(huán)境科學(xué)與工程學(xué)院,b內(nèi)燃機(jī)燃燒學(xué)國家重點(diǎn)實(shí)驗(yàn)室,天津300072)摘要在800~950℃的氣化溫度下,采用等溫?zé)嶂貙?shí)驗(yàn)方法對三種不同性質(zhì)污泥在450℃下熱解制得半焦的COz氣化反應(yīng)特性進(jìn)行了研究.
2、結(jié)果表明:隨著氣化溫度的升高,污泥半焦完成氣化反應(yīng)所需的時(shí)間縮短,氣化反應(yīng)速率變快;半焦氣化反應(yīng)速率隨碳轉(zhuǎn)化率的增大而先增大后減小,且達(dá)到最大氣化反應(yīng)速率時(shí)的碳轉(zhuǎn)化率隨氣化溫度的升高而增加.在較低或較高的氣化溫度下,污水處理工藝中的厭氧過程使半焦氣化反應(yīng)性降低,而在中等氣化溫度下幾乎沒有影響;污泥厭氧消化則使半焦氣化反應(yīng)性明顯降低,并隨氣化溫度的升高而降低得更加明顯.利用收縮核模型研究了污泥半焦的氣化反應(yīng)過程,結(jié)果表明:污水處理工藝對半焦氣化反應(yīng)的活化能和指前因子沒有影響,而污泥厭氧消化則使它們降低.關(guān)鍵詞污水污
3、泥;半焦;氣化反應(yīng);污水處理工藝;厭氧消化中圖分類號X705文獻(xiàn)標(biāo)志碼A文章編號l671-4512(2013)09—0081一O4StudyonCO2gasificationreactionpropertiesofcharsderivedfromsewagesludgeXieLipingWangJunMaWenchao。CaoZhanping(1SchoolofEnvironmentalandChemicalEngineering,TianjinPolytechnicUniversity,Tianjin30038
4、7,China;2aSchoolofEnvironmentalScienceandEngineering,bStateKeyLaboratoryofEngines,TianjinUniversity.Tianjin300072。China)AbstractThegasificationreactionpropertiesofsludgecharswithCO2,derivedfromthepyrolysisofthreedifferentsewagesludgesunder450。C,werestudiedbyi
5、sothermalthermalgravimetricanalysisatthegasificationtemperaturerangefrom800℃to950℃.Theresultsshowthatthegasificationre—actionrateandcompletiontimeofsludgecharsquickensanddecreaseswithgasificationtemperatureincreasingrespectively.Thegasificationreactionrateoft
6、hecharsfirstlyincreasesandthendecreaseswiththecarbonconversionrateincreasing,andthecarbonconversionrateatthemaximumgasifica—tionreactionrateincreaseswithgasificationtemperature.Theanaerobicprocessinwastewatertreat—mentprocessmakesgasificationreactivityofthech
7、ardecreaseatlowerorhighergasificationtempera—ture,butthereislittleinfluenceonitatthemiddletemperature.However,thesludgeanaerobicdi—gestionleadsgasificationreactivityofchardecreaseobviously,andthedecreasebecomesmuchmoreobviouswithgasificationtemperatureincreas
8、ing.Thegasificationreactionprocessesofsludgecharswerestudiedthroughtheshrinkingcoremodel,indicatingthatthereisnoinfluenceofthewastewatertreatmentprocessesontheactivationenergyandpre—expon