循环流化床飞灰对钾基吸附剂脱除CO_2影响研究
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摘要
通过小型固定床研究了循环流化床飞灰对钾基吸附剂碳酸化反应的影响,利用X射线衍射仪(XRD)、扫描电镜(SEM)和氮吸附等表征手段进行检测分析,结果表明:循环流化床飞灰对钾基吸附剂脱除CO_2有促进作用,当吸附剂中飞灰与K_2CO_3质量比为1∶10和1∶5时,吸附率由70. 09%增加到73. 70%和71. 91%;飞灰在碳酸化反应过程中无明显化学变化;由于飞灰具有多孔的表面结构、较大的比表面积、孔容和孔径范围大等特点,对CO_2物理吸附效果好;但由于其微孔、小孔比例大,物理吸附饱和后堵塞通道,降低碳酸化反应吸附量。
The effect of fly ash from circulating fluidized bed( CFB) power plants on the carbonation of potassium-based sorbents was studied by a small fixed bed. X-ray diffraction( XRD),scanning electron microscopy( SEM) and N_2 adsorption were used for the detection. The results showed that the fly ash in CFB had a catalytic influence on the removal of CO2 on the potassium-based sorbents,and the adsorption rate rose from 70. 09% to 73. 70% and 71. 91%. Fly ash had no evident chemical reaction during the carbonation reaction,therefore it had physical adsorption of CO_2. As fly ash had characteristics of porous surface structure,large surface area and pore volume,wide range of pore diameter and large amount of micropores,it had a good performance in physical adsorption of CO_2. While the ratio of the micropores and small holes of the CFB fly ash was large,the channel was blocked when the physical adsorption was saturated,resulting in reducing the adsorption amount of carbonation.
The effect of fly ash from circulating fluidized bed( CFB) power plants on the carbonation of potassium-based sorbents was studied by a small fixed bed. X-ray diffraction( XRD),scanning electron microscopy( SEM) and N_2 adsorption were used for the detection. The results showed that the fly ash in CFB had a catalytic influence on the removal of CO2 on the potassium-based sorbents,and the adsorption rate rose from 70. 09% to 73. 70% and 71. 91%. Fly ash had no evident chemical reaction during the carbonation reaction,therefore it had physical adsorption of CO_2. As fly ash had characteristics of porous surface structure,large surface area and pore volume,wide range of pore diameter and large amount of micropores,it had a good performance in physical adsorption of CO_2. While the ratio of the micropores and small holes of the CFB fly ash was large,the channel was blocked when the physical adsorption was saturated,resulting in reducing the adsorption amount of carbonation.
引文
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[14]刘娟娟,乔晓磊,冯翠英,等.循环流化床锅炉飞灰微观特性的研究[J].煤炭学报,2011,36(11):1922-1927.LIU Juan-juan,QIAO Xiao-lei,FENG Cui-ying,et al. Research onmicrocosmic characteristics of fly ash from circulating fluidizedbed boilers[J]. Journal of China Coal Society,2011,36(11):1922-1927.
[15]金燕,刘娟娟,乔晓磊,等.循环流化床锅炉中飞灰颗粒孔隙结构的实验研究[J].热能动力工程,2012,27(1):71-75.JIN Yan,LIU Juan-juan,QIAO Xiao-lei,et al. Experimental studyof the pore structure of the flying ash particles in a CFB boiler[J]. Journal of Engineering for Thermal Energy and Power,2012,27(1):71-75.
[2] NJINIK M,BIZIKOVA L. Responding to the Kyoto Protocol throughforestry[J]. Forest Policy and Economics,2008,10(4):257-269.
[3] STEENEVELDT R. CO2capture and storage:closing the knowing-doing gap[J]. Chemical Engineering Research and Design,2006,84(9):739-763.
[4] GREEN D A,TURK B S,PORTZER J W,et al. Carbon dioxidecapture from flue gas using dry regenerable sorbents[R]. QuarterlyTechnical Progress Report Research Triangle Institute,2001.
[5] LIANG Y,HARRISON D P,GUPTA R P,et al. Carbon dioxidecapture using dry sodium-based sorbents[J]. Energy&Fuels,2004,18(2):569-575.
[6] LEE S C,CHOI B Y,LEE T J,et al. CO2absorption and regenera-tion of alkali metal-based solid sorbents[J]. Catalysis Today,2006,111:385-390.
[7] RYU C K,LEE J B,EOM T H,et al. CO2capture from flue gas u-sing dry regenerable sorbents[C]. 8th International Conference onGreenhouse Gas Control Technology,Trondheim,Norway,2006.
[8]赵传文,陈晓平,赵长遂.钾基CO2吸附剂再生反应特性[J].工程热物理学报,2009,30(12):2145-2148.ZHAO Chuan-wen,CHEN Xiao-ping,ZHAO Chang-sui. Character-istics of regeneration reaction of dry Potassium-based sorbent forCO2capture[J]. Journal of Engineering Thermophysics,2009,30(12):2145-2148.
[9] ZHAO Chuan-wen,GUO Ya-fei,LI Chang-hai,et al. Removal oflow concentration CO2at ambient temperature using several potas-sium-based sorbents[J]. Applied Energy,2014,124:241-247.
[10]赵传文,陈晓平,赵长遂.钾基CO2吸收剂的碳酸化反应特性[J].化工学报,2008,59(9):2328-2333.ZHAO Chuan-wen,CHEN Xiao-ping,ZHAO Chang-su. Carbona-tion reaction characteristics of dry Potassium-based sorbent forCO2capture[J]. Journal of Chemical Industry and Engineering,2008,59(9):2328-2333.
[11]吴烨,陈晓平,赵传文,等. SO2对钾基吸附剂干法脱除CO2反应的影响机制[J].中国电机工程学报,2010,30(20):39-43.WU Ye,CHEN Xiao-ping,ZHAO Chuan-wen,et al. Influencingmechanism of SO2on the process of CO2capture using dry potas-sium-based sorbents[J]. Proceeding of the CSEE,2010,30(20):39-43.
[12]郭欣,郑楚光,孙涛.电厂煤飞灰颗粒物的物理化学特征[J].燃烧科学与技术,2005,11(2):192-195.GUO Xin,ZHENG Chu-guang,SUN Tao. Physicochemical charac-teristics of fly ash from coal-fired power station[J]. Journal ofCombustion Science and Technology,2005,11(2):192-195.
[13]赵传文,陈晓平,赵长遂.负载型K2CO3/Al2O3二氧化碳吸附剂的碳酸化反应特性[J].化工学报,2009,60(4):1022-1027.ZHAO Chuan-wen,CHEN Xiao-ping,ZHAO Chang-sui. Carbona-tion Characteristics of K2CO3/Al2O3for CO2capture[J]. CIESCJournal,2009,60(4):1022-1027.
[14]刘娟娟,乔晓磊,冯翠英,等.循环流化床锅炉飞灰微观特性的研究[J].煤炭学报,2011,36(11):1922-1927.LIU Juan-juan,QIAO Xiao-lei,FENG Cui-ying,et al. Research onmicrocosmic characteristics of fly ash from circulating fluidizedbed boilers[J]. Journal of China Coal Society,2011,36(11):1922-1927.
[15]金燕,刘娟娟,乔晓磊,等.循环流化床锅炉中飞灰颗粒孔隙结构的实验研究[J].热能动力工程,2012,27(1):71-75.JIN Yan,LIU Juan-juan,QIAO Xiao-lei,et al. Experimental studyof the pore structure of the flying ash particles in a CFB boiler[J]. Journal of Engineering for Thermal Energy and Power,2012,27(1):71-75.