Fe_2O_3添加对松木屑热解的影响特性分析
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摘要
为了探究松木屑粉末在不同比例的Fe_2O_3添加下的焦油产率、残炭产率、气体产率和气体组分的变化规律,采用热重和管式加热炉热解的方法对松木屑粉末进行实验研究。实验在N_2气氛保护下,以50℃/min的速率升温,终温分别为350、450、550、650和750℃时研究松木屑粉末的热解变化规律。实验结果表明:随着温度的升高,在无添加下松木屑粉末的焦油产率和气体产率逐渐升高,而残炭产率有所下降。分析气体组分变化可知,随着温度的升高CO_2下降趋势较为明显,CO与C_nH_m基本保持不变,CH_4与H_2出现明显上升。添加Fe_2O_3可以有效降低松木屑粉末的焦油产率、残炭产率,提升气体产率,原料中Fe_2O_3比例越高效果越明显。添加15%Fe_2O_3在750℃时的焦油产率相比于纯松木屑热解降低4.25%,气体产率提升8.57%,此时的H_2产率为44.42 L/kg,表明Fe_2O_3具有良好的催化效果。
In order to explore the tar yield, residual carbon yield, gas yield and gas composition changing with the Fe_2O_3 proportion added into pine sawdust powde, experimental study was carried out by means of thermogravimetry and pyrolysis in tubular heating furnace. With the protection of N_2 atmosphere and heating rate of 50 ℃/min, the pyrolysis of pine sawdust powder was studied at 350, 450, 550, 650 and 750 ℃.The results show that with the increase of temperature, the tar yield and gas production rate of the pine powder gradually increase without the addition of Fe_2O_3, but the carbon residue rate decreases. By analyzing the component changes, it is found that with the increase of temperature CO_2 decreases significantly, CO and CnHm remain unchanged, and CH_4 and H_2 increase significantly. The addition of Fe_2O_3 can effectively reduce the tar yield, residual carbon rate and improve the gas production rate of the pine wood powder. The greater the proportion of Fe_2O_3 in the raw material, the more obvious the effect will be. The tar yield of 15% Fe_2O_3 addition decreases by 4.25% and the gas production rate increases by 8.57% at the temperature of 750 ℃, and the yield of H_2 is 44.42 L/kg at the same time, which indicates that Fe_2O_3 has good catalytic effect.
In order to explore the tar yield, residual carbon yield, gas yield and gas composition changing with the Fe_2O_3 proportion added into pine sawdust powde, experimental study was carried out by means of thermogravimetry and pyrolysis in tubular heating furnace. With the protection of N_2 atmosphere and heating rate of 50 ℃/min, the pyrolysis of pine sawdust powder was studied at 350, 450, 550, 650 and 750 ℃.The results show that with the increase of temperature, the tar yield and gas production rate of the pine powder gradually increase without the addition of Fe_2O_3, but the carbon residue rate decreases. By analyzing the component changes, it is found that with the increase of temperature CO_2 decreases significantly, CO and CnHm remain unchanged, and CH_4 and H_2 increase significantly. The addition of Fe_2O_3 can effectively reduce the tar yield, residual carbon rate and improve the gas production rate of the pine wood powder. The greater the proportion of Fe_2O_3 in the raw material, the more obvious the effect will be. The tar yield of 15% Fe_2O_3 addition decreases by 4.25% and the gas production rate increases by 8.57% at the temperature of 750 ℃, and the yield of H_2 is 44.42 L/kg at the same time, which indicates that Fe_2O_3 has good catalytic effect.
引文
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[2] 孙立.生物质热解气化原理与技术 [M].北京:化学工业出版社,2013:231-258.SUN Li.Principle and Technology of Biomass Pyrolysis and Gasification [M].Beijing:Chemical Industry Press,2013:231-258.(in Chinese)
[3] 王茹,侯书林,赵立欣,等.生物质热解炭化的关键影响因素分析 [J].可再生能源,2013,31(6):90-95.WANG Ru,HOU Shu-lin,ZHAO Li-xin,et al.Analysis on influence factors of biomass pyrolysis carbonization [J].Renewable Energy Resources,2013,31(6):90-95.(in Chinese)
[4] ONAY O,KO?KAR O M.Fixed-bed pyrolysis of rapeseed (Brassica napus L) [J].Biomass & Bioenergy,2004,26(3):289-299.
[5] YAO J,KRAUSSLER M,BENEDIKT F,et al.Techno-economic assessment of hydrogen production based on dual fluidized bed biomass steam gasification,biogas steam reforming,and alkaline water electrolysis processes [J].Energy Conversion & Management,2017,145:278-292.
[6] HORNE P A,WILLIAMS P T.Influence of temperature on the products from the flash pyrolysis of biomass [J].Journal of Pediatrics,1996,75(9):1051-1059.
[7] HAYKIRI-ACMA H,YAMAN S,KUCUKBAYRAK S.Effect of heating rate on the pyrolysis yields of rapeseed [J].Renewable Energy,2006,31(6):803-810.
[8] 李海亮,汪春,孙海天,等.农作物秸秆的综合利用与可持续发展 [J].农机化研究,2017,39(8):256-262.LI Hai-liang,WANG Chun,SUN Hai-tian,et al.Research on automatic spraying machine for intelligent monitoring of agricultural pests and diseases based on internet of things [J].Journal of Agricultural Mechanization Research,2017,39(8):256-262.(in Chinese)
[9] 庞赟佶,王宏东,陈义胜,等.管式炉中温度对玉米秸秆慢速热解特性的影响分析 [J].科学技术与工程,2017,17(19):35-40.PANG Yun-ji,WANG Hong-dong,CHEN Yi-sheng,et al.Effect of temperature in tube furnace on slow pyrolysis characteristics of corn stalk [J].Science Technology and Engineering,2017,17(19):35-40.(in Chinese)
[10] DEMIRBA? A.Gaseous products from biomass by pyrolysis and gasification:effects of catalyst on hydrogen yield [J].Energy Conversion & Management,2002,43(7):897-909.
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[12] 田春燕.Fe/CaO作用于生物质热化学转化过程的实验研究 [D].青岛:中国石油大学(华东),2015.TIAN Chun-yan.Experimental Study of Fe/CaO on Biomass Thermochemical Conversion Process [D].Qingdao:China University of Petroleum,2015.(in Chinese)
[13] 陈义胜,栾艳春,庞赟佶,等.褐铁矿催化作用下生物质高温水蒸气气化实验研究 [J].热科学与技术,2016,15(1):75-80.CHEN Yi-sheng,LUAN Yan-chun,PANG Yun-ji,et al.Experimental study on high temperature steam gasification of biomass catalyzed by lignite [J].Journal of Thermal Science and Technology,2016,15(1):75-80.(in Chinese)
[14] 邵珊珊.生物质催化热解中催化剂积炭与再生特性研究 [D].南京:东南大学,2016.SHAO Shan-shan.Study on Coking and Regeneration Characteristics of Catalysts in The Catalytic Pyrolysis of Biomass [D].Nanjing:Southeast University,2016.(in Chinese)
[15] 王瑀喆,汪波,张桉童,等.生物质热解实验及其动力学模型研究 [J].电力科学与工程,2017,33(1):21-26.WANG Yu-zhe,WANG Bo,ZHANG An-tong,et al.Study on the biomass pyrolysis experiment and kinetics model [J].Power Science and Engineering,2017,33(1):21-26.(in Chinese)
[16] 姚建中,陈洪章,张均荣,等.玉米秸秆快速热解 [J].过程工程学报,2000,21(4):434-437.YAO Jian-zhong,CHEN Hong-zhang,ZHANG Jun-rong,et al.Fast pyrolysis of corn straw [J].Engineering Chemistry & Metallurgy,2000,21(4):434-437.(in Chinese)
[17] URASAKI K,TANIMOTO N,HAYASHI T,et al.Hydrogen production via steam-iron reaction using iron oxide modified with very small amounts of palladium and zirconia [J].Applied Catalysis A:General,2005,288(1-2):143-148.
[18] 宋春财,胡浩权,朱盛维,等.生物质秸秆热重分析及几种动力学模型结果比较 [J].燃料化学学报,2003(4):311-316.SONG Chun-cai,HU Hao-quan,ZHU Sheng-wei,et al.Biomass pyrolysis and its kinetic parameters with different methods [J].Journal of Fuel Chemistry,2003(4):311-316.(in Chinese)
[19] 王明峰,蒋恩臣,周岭.玉米秸秆热解动力学分析 [J].农业工程学报,2009,25(2):204-207.WANG Ming-feng,JIANG En-chen,ZHOU Ling.Kinetic analysis of cornstalk pyrolysis [J].Transactions of the Chinese Society of Agricultural Engineering,2009,25(2):204-207.(in Chinese)
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[21] FAN L S,LI F X,RAMKUMAR S.Utilization of chemical looping strategy in coal gasification processes [J].Particuology,2008,6(3):131-142.
[22] 梁皓,宋喜军,尹泽群,等.化学链制氢中Fe2O3/LaFeO3载氧体的性能研究 [J].燃料化学学报,2013,41(12):1512-1519.LIANG Hao,SONG Xi-jun,YIN Ze-qun,et al.Performance of Fe2O3/LaFeO3 as oxygen carrier in chemical-looping hydrogen generation [J].Joumal of Fuel Chemistry and Technology,2013,41(12):1512-1519.(in Chinese)