油田油泥热解焦掺混微藻渣燃烧实验研究
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摘要
热解能够实现油泥资源化利用,热解后的热解焦可以通过焚烧实现能量的梯级利用。利用热分析仪研究不同掺混比(φ)及不同升温速率(β)下的油泥热解焦与微藻渣混合燃烧实验,TG和DTG曲线表明,混合燃烧过程分为结晶水挥发、挥发分析出和燃烧、固定碳燃烧和矿物质燃烧分解。采用KAS和OFW等转化率法进行动力学参数求解。结果表明,添加微藻渣提高了混合燃料燃烧特性;β的增加促使传质阻力增大,质量损失段向高温区移动;活化能(E_a)值增大,燃烧稳定性提高。
Pyrolysis can help resource utilization of oil sludge, and combustion of oil sludge pyrolysis char can optimize energy utilization. In this work, co-combustion experiments under different mix ratios(φ) of oil sludge and microalgae residues were carried out in a thermogravimetry system at different heating rates(β). TG and DTG curves indicate that co-combustion consists of different processes including moisture volatilization, volatiles release and combustion, fixed carbon combustion and minerals decomposition. KAS and OFW the isoconversional methods were applied to find kinetic parameters. Experimental results indicate that microalgae residues could improve combustion performance of the blended fuel. A higher heating rate could cause a larger mass transfer resistance, with mass loss region moving to the high temperature range. A higher activation energy(E_a) could improve co-combustion stability.
Pyrolysis can help resource utilization of oil sludge, and combustion of oil sludge pyrolysis char can optimize energy utilization. In this work, co-combustion experiments under different mix ratios(φ) of oil sludge and microalgae residues were carried out in a thermogravimetry system at different heating rates(β). TG and DTG curves indicate that co-combustion consists of different processes including moisture volatilization, volatiles release and combustion, fixed carbon combustion and minerals decomposition. KAS and OFW the isoconversional methods were applied to find kinetic parameters. Experimental results indicate that microalgae residues could improve combustion performance of the blended fuel. A higher heating rate could cause a larger mass transfer resistance, with mass loss region moving to the high temperature range. A higher activation energy(E_a) could improve co-combustion stability.
引文
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[2]杨淑清,郑贤敏,王北福,等.临港含油污泥的热解动力学分析[J].化工学报,2015,66(增刊1):319-325.(YANG Shuqing,ZHENG Xianmin,WANG Beifu,et al.Analysis of pyrolysis kinetics of neighboring-port oil sludge[J].CIESC Journal,2015,66(s1):319-325.)
[3]GONG Z,DU A,WANG Z,et al.Experimental study on pyrolysis characteristics of oil sludge with a tube furnace reactor[J].Energy&Fuels,2017,31(8):8102-8108.
[4]LIU J,JIANG X,HAN X.Devolatilization of oil sludge in a lab-scale bubbling fluidized bed[J].Journal of Hazardous Materials,2011,185(3):1205-1213.
[5]CANO R,P REZELVIRA S I,FDZPOLANCO F.Energy feasibility study of sludge pretreatments:Areview[J].Applied Energy,2015,149:176-185.
[6]HOU S S,CHEN M C,LIN T H.Experimental study of the combustion characteristics of densified refuse derived fuel(RDF-5)produced from oil sludge[J].Fuel,2014,116:201-207.
[7]ZHOU L,JIANG X,LIU J.Characteristics of oily sludge combustion in circulating fluidized beds[J].Journal of Hazardous Materials,2009,170(1):175-179.
[8]LIU J,JIANG X,ZHOU L,et al.Co-firing of oil sludge with coal-water slurry in an industrial internal circulating fluidized bed boiler[J].Journal of Hazardous Materials,2009,167(1):817-823.
[9]SCHMIDT H,KAMINSKY W.Pyrolysis of oil sludge in a fluidised bed reactor[J].Chemosphere,2001,45(3):285-290.
[10]WANG Z,GONG Z,WANG Z,et al.A TG-MS study on the coupled pyrolysis and combustion of oil sludge[J].Thermochimica Acta,2018,663:137-144.
[11]余斌,李社锋,方梦祥.多联产半焦燃烧特性的热重研究[J].动力工程学报,2010,30(3):214-218.(YUBin,LI Shefeng,FANG Mengxiang.Thermogravimetric study on the combustion characteristics of semi-cokes from polygeneration[J].Journal of Chinese Society of Power Engineering,2010,30(3):214-218.)
[12]YOUNG B C,MCCOLLOR D P,WEBER B J,et al.Temperature measurements of Beulah lignite char in a novel laminar-flow reactor[J].Fuel,1988,67(1):40-44.
[13]杜瑞岭.半焦的形成过程及其与煤粉混合燃烧的动力学研究[D].北京:北京科技大学,2017.
[14]刘洪鹏,孙晓建,贾春霞,等.油页岩半焦矿物组分分析及其与玉米秸秆混烧特性[J].农业工程学报,2016,32(10):226-231.(LIU Hongpeng,SUN Xiaojian,JIAChunxia,et al.Analysis of mineral composition of oil shale semi-coke and its co-combustion performance with cornstalks[J].Transactions of the Chinese Society of Agricultural Engineering,2016,32(10):226-231.)
[15]易其国.生物质微米燃料高温燃烧实验及动力学模型研究[D].武汉:华中科技大学,2013.
[16]GONG Z,WANG L,WANG Z,et al.Experimental study on combustion and pollutants emissions of oil sludge blended with microalgae residue[J].Journal of the Energy Institute,2018,91(6):877-886.
[17]YUAN H,LU T,HUANG H,et al.Influence of temperature on product distribution and biochar properties by municipal sludge pyrolysis[J].Journal of Material Cycles&Waste Management,2013,15(3):357-361.
[18]CHEN T,ZHANG Y,WANG H,et al.Influence of pyrolysis temperature on characteristics and heavy metal adsorptive performance of biochar derived from municipal sewage sludge[J].Bioresour Technol,2014,164(7):47-54.
[19]YU J,ZHANG M C,ZHANG J.Experimental and numerical investigations on the interactions of volatile flame and char combustion of a coal particle[J].Proceedings of the Combustion Institute,2009,32(2):2037-2042.
[20]SEONGYOOL A,GYUNGMIN C,DUCKJOOL K.The effect of wood biomass blending with pulverized coal on combustion characteristics under oxy-fuel condition[J].Biomass&Bioenergy,2014,71:144-154.
[21]YU L J,WANG S,JIANG X M,et al.Thermal analysis studies on combustion characteristics of seaweed[J].Journal of Thermal Analysis&Calorimetry,2008,93(2):611-617.
[22]CHEN J,XIE C,LIU J,et al.Co-combustion of sewage sludge and coffee grounds under increased O2/CO2atmospheres:Thermodynamic characteristics,kinetics and artificial neural network modeling[J].BioresourTechnol,2018,250:230-238.
[23]AKAHIRA T,SUNOSE T.Joint convention of four electrical institutes[J].Sci Technol,1971,16:22-31.
[24]KISSINGER H E.Reaction kinetics in differential thermal analysis[J].Analytical Chemistry,1957,29(11):1702-1706.
[25]MARINI A,BERBENNI V,FLOR G.Kineticparameters from thermogravimetric data[J].Zeitschrift Für Naturforschung A,1979,34(5):661-663.
[26]DOYLE C D.Estimating isothermal life from thermogravimetric data[J].Journal of Applied Polymer Science,2010,6(24):639-642.
[27]FLYNN J H,WALL L A.A quick,direct method for the determination of activation energy from thermogravimetric data[J].Journal of Polymer Science Part C Polymer Letters,1966,4(5):323-328.
[28]FANG M X,SHEN D K,LI Y X,et al.Kinetic study on pyrolysis and combustion of wood under different oxygen concentrations by using TG-FTIR analysis[J].Journal of Analytical&Applied Pyrolysis,2006,77(1):22-27.