Combustion property and kinetics of fine chars derived from fluidized bed gasifier
-
摘要: 利用热天平研究了三种不同变质程度煤流化床气化半焦细粉的燃烧特性,考察了灰分对燃烧行为的影响,同时采用三种不同的动力学计算方法对其燃烧动力学进行了分析。研究结果表明,挥发分的存在能显著降低低阶褐煤半焦细粉的着火点;高温下半焦细粉中矿物质的分解导致其DTG曲线出现较为明显的二次峰。细粉中的灰分对其燃尽性能和综合燃烧反应性都具有一定的抑制作用。动力学分析结果表明,燃烧活化能随转化率的增加而增加;三种常用动力学分析方法中,Vyazovkin对半焦细粉的燃烧拟合效果最好。Abstract: The combustion properties of 3 fine chars derived from fluidized bed gasification of coals with different rank were studied in a thermogravimetric analyzer (TGA). In addition, the influence of ash on combustion reactivity was investigated, and the processes were analyzed using three kinetic methods to obtain the kinetic parameters. The results suggest that the existence of volatile in fine char from low-rank lignite reduces its ignition temperature, while the decomposition of inherent minerals at relatively high temperature leads to a second peak in the DTG curve. The ashes of fine chars have an inhibiting influence on burn-out ability and comprehensive combustion reactivity. The kinetic analysis indicates that the activation energy increases with the increasing burnout extent. Compared with Coats-Redfern and Ozawa-Flynn-Wall methods, the Vyazovkin method fits the experiment results best.
-
Key words:
- fluidized bed gasifier /
- fine char /
- combustion kinetics
-
景旭亮, 王志青, 房倚天. 流化床气化炉半焦细粉水蒸气再气化特性及动力学研究[J]. 燃料化学学报, 2013, 41(4): 400-406. (JING Xu-liang, WANG Zhi-qing, FANG Yi-tian. Steam re-gasification properties and kinetics of coal char fines derived from fluidized bed gasifier[J]. Journal of Fuel Chemistry and Technology, 2013, 41(4): 400-406.) 岑建孟, 方梦祥, 王勤辉, 骆仲泱, 岑可法. 煤分级利用多联产技术及其发展前景[J]. 化工进展, 2011, 30(1): 88-94. (CEN Jian-meng, FANG Meng-xiang, WANG Qin-hui, LUO Zhong-yang, CEN Ke-fa. Development and prospect of coal staged conversion poly-generation technology[J]. Chemical Industry and Engineering Progress, 2011, 30(1): 88-94.) 罗海华, 张世红, 陈汉平, 刘德昌, 杨海平. 循环流化床锅炉飞灰残碳燃烧特性的实验研究[J]. 煤炭转化, 2008, 31(1): 61-65. (LUO Hai-hua, ZHANG Shi-hong, CHEN Han-ping, LIU De-chang, YANG Hai-ping. Experimental research on combustion characteristics of residua carbon of fly ash from CFB boiler[J]. Coal Conversion, 2008, 31(1): 61-65.) KELEBOPILE L, SUN R, LIAO J. Fly ash and coal char reactivity from Thermo-gravimetric (TGA) experiments[J]. Fuel Process Technol, 2011, 92(6): 1178-1186. 张守玉, 王文选, 杨玉来, 荆鹏飞, 吕俊复, 岳光溪. 锅炉飞灰燃烧特性实验研究[J]. 煤炭转化, 2003, 26(4): 65-68. (ZHANG Shou-yu, WANG Wen-xuan, YANG Yu-lai, JING Peng-fei, LV Jun-fu, YUE Guang-xi. Investigation on the combustion properties of fly ash[J]. Coal Conversion, 2003, 26(4): 65-68.) 刘典福, 魏小林, 盛宏至. 半焦燃烧特性的热重试验研究[J]. 工程热物理学报, 2007, 28(2): 229-232. (LIU Dian-fu, WEI Xiao-lin, SHENG Hong-zhi. Thermogravimetric experimental study on combustion characteristics of semicoke[J]. Journal of Engineering Thermophysics, 2007, 28(2): 229-232.) COATS A W, REDFERN J P. Kinetics parameters from thermogravimetric date[J]. Nature, 1964, 201: 68-69. VYAZOVKIN S, WIGHT C A. Isothermal and non-isothermal kinetics of thermally stimulated reactions of solids[J]. Int Rev Phys Chem, 1998, 17(3): 407-433. FLYNN J H, WALL L A. A quick, direct method for the determination of activation energy from thermogravimetric data[J]. J Polym Sci Pol Lett, 1966, 4(5): 323-328. OUNAS A, ABOULKAS A, ELHARFI K, BACAOUI A, YAACOUBI A. Pyrolysis of olive residue and sugar cane bagasse: Non-isothermal thermogravimetric kinetic analysis[J]. Bioresour Technol, 2011, 102(24): 11234-11238. 赵增立, 李海滨, 吴创之, 陈勇. 蔗渣的热解与燃烧动力学特性研究[J]. 燃料化学学报, 2005, 33(3): 312-319. (ZHAO Zeng-li, LI Hai-bin, WU Chuang-zhi, CHEN Yong. Study on the kinetic characteristics of bagasse pyrolysis and combustion[J]. Journal of Fuel Chemistry and Technology, 2005, 33(3): 312-319.) 邓芙蓉, 杨建国, 赵 虹. 利用TG-DSC方法研究煤灰熔融特性[J]. 煤炭科学技术, 2005, 33(2): 46-49. (DENG Fu-rong, YANG Jian-guo, ZHAO Hong. Study on coal ash fusion characteristics with TG-DSC method[J]. Coal Science and Technology, 2005, 33(2): 46-49.) 鲜晓红, 杜云贵, 张光辉. TG-DTG/DTA研究混煤的燃烧特性[J]. 煤炭转化, 2011, 34(3): 67-70. (XIAN Xiao-hong, DU Yun-gui, ZHANG Guang-hui. Combustion characteristics of coal blending by TG-DTG/DTA[J]. Coal Conversion, 2011, 34(3): 67-70.) 姜秀民, 李巨斌, 邱健荣. 超细化煤粉燃烧特性的研究[J]. 中国电机工程学报, 2000, 20(6): 71-74. (JIANG Xiu-min, LI Ju-bin, QIU Jian-rong. Study on combustion characteristic of micro-pulverized coal[J]. Proceedings of the CSEE, 2000, 20(6): 71-74.) 李梅, 吕硕, 焦向炜. 内在矿物质对煤焦燃烧特性影响的实验研究[J]. 煤炭转化, 2009, 32(2): 33-36. (LI Mei, LV Shuo, JIAO Xiang-wei. Experimental study on influence of included minerals on the char combustion characteristics[J]. Coal Conversion, 2009, 32(2): 33-36.) 孙庆雷, 李文, 陈皓侃, 李保庆. DAEM和Coats-Redfern积分法研究煤半焦燃烧动力学的比较[J]. 化工学报, 2003, 54(11): 1598-1602. (SUN Qing-lei, LI Wen, CHEN Hao-kan, LI Bao-qing. Comparison between DAEM and Coats-Redfern method for combustion kinetics of coal char[J]. Journal of Chemical Industry and Engineering, 2003, 54(11): 1598-1602.)
点击查看大图
计量
- 文章访问数: 1239
- HTML全文浏览量: 27
- PDF下载量: 765
- 被引次数: 0