核桃壳炭质燃料的性能及热解过程研究
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摘要
研究了核桃壳热解过程中焦炭的性能的变化,并对热解过程进行了分析。对不同温度下制备的焦炭进行产率、工业分析和热值测量,通过SEM、BET等表征手段,对焦炭的孔洞结构和比表面积进行分析。实验结果表明,随着热解温度的升高,焦炭固定碳、灰分增加,挥发分、产率下降,热值和比表面积呈现先增后减趋势。500℃时,焦炭产率>26%,热值>30MJ/kg,固定碳>80%,灰分<3%,挥发分<17%,比表面积>292 m2/g,具有优异的性能,该温度下可制备高质量炭质燃料。
The change in the properties of coke during the pyrolysis of walnut shell was studied and the pyrolysis process was analyzed. Char yield,proximate analysis and heat values of chars obtained under different temperatures were analyzed. Moreover,the bio-char fuels were characterized by the techniques of SEM and BET,the effect of pyrolysis temperature on porous structures and specific surface area of walnut shell chars were analyed. Experimental results indicated that the fixed carbon and ash contents increased,volatile matter and char yield decreased with increasing pyrolysis temperature. Heat value and specific surface area increased firstly and tended to decline later with the increase of temperature. Under the pyrolysis temperature of 500 ℃,char yield>26%,heat value>30 MJ/kg,fixed carbon content >80%,ash content <3%,volatile matter content <17%,specific surface area>292 m2/g. Furthermore,chars obtained under 500℃were endowed with superior performance,hence high quality char fuels can be produced at 500℃.
The change in the properties of coke during the pyrolysis of walnut shell was studied and the pyrolysis process was analyzed. Char yield,proximate analysis and heat values of chars obtained under different temperatures were analyzed. Moreover,the bio-char fuels were characterized by the techniques of SEM and BET,the effect of pyrolysis temperature on porous structures and specific surface area of walnut shell chars were analyed. Experimental results indicated that the fixed carbon and ash contents increased,volatile matter and char yield decreased with increasing pyrolysis temperature. Heat value and specific surface area increased firstly and tended to decline later with the increase of temperature. Under the pyrolysis temperature of 500 ℃,char yield>26%,heat value>30 MJ/kg,fixed carbon content >80%,ash content <3%,volatile matter content <17%,specific surface area>292 m2/g. Furthermore,chars obtained under 500℃were endowed with superior performance,hence high quality char fuels can be produced at 500℃.
引文
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[7]彭锦星,陈冠益,王德芹,等.木质材料热解动力学及典型气体产物分析[J].太阳能学报,2011,32(12):1719-1724.
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[9]ATES F,ISIKDAG M A.Influence of Temperature and Alumina Catalyst on Pyrolysis of Corncob[J].Fuel,2009,88(10):1991-1997.
[10]CAO Q,XIE KC,BAOW R,et al.Pyrolytic Behavior of Waste Corncob[J].Bioresource Technology,2004,94(1):83-89.
[11]ZHANG X D,XU M,SUN R F,et al.Study on Biomass Pyrolysis Kinetics[J].Journal of Engineering for Turbines and Power,2006,128(3):493-496.
[12]张丹枫,刘慧利,胡建杭,等.核桃壳热裂解产物有机结构演变规律[J].工业加热,2017,46(4):9-13.
[13]熊绍武,张守玉,吴巧美,等.生物质制备燃料炭实验研究[J].太阳能学报,2015,36(5):1041-1047.
[14]程伟凤,李慧,杨艳琴,等.城市污泥厌氧发酵残渣热解制备生物炭及其氮磷吸附研究[J].化工学报,2016,67(4):1541-1548.
[15]朱金陵,何晓峰,王志伟,等,雷廷宙.玉米秸秆颗粒热解制炭的试验研究[J].太阳能学报,2010,7(31):789-793.
[16]LI A,LIU H L,WANG H.Effects of Temperature and Heating Rate on the Characteristics of Molded Bio-char[J].Bio Resources,2016,11(2):3259-3274.
[17]廖艳芬,曾成才,马晓茜,等.中国南方典型生物质热解及燃烧特性热重分析[J].华南理工大学学报:自然科学版,2013,41(8):1-8.