Spectroscopical Analysis and Coking Mechanisim of Char Layer in Ascension Pipe of Coke Oven
WANG Hao1, 2, JIN Bao-sheng1*, WANG Xiao-jia1, YU Bo2, CAO Jun1
1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China
2. Huatian Engineering & Technology Corporation, Metallurgical Corporation of China, Ma’anshan 243005, China
Abstract:In this research, the coke layer on the surface of ascension pipe is investigated, and X-ray fluorescence spectrometer (XRF), X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR) and Laser confocal Raman spectrometer (Raman) are applied to investigate mineral composition of the coke, component structure and molecular structure of different coke layer. The research focuses on the differences of coke layer from outer surface to inner surface, and further reveals coking mechanism of ascension peipe heat exchanger. The research displays that the elements of ferrous, sulfur and chromium in dust can catalyst polycyclic aromatic hydrocarbons (anthracene, naphthalene et. al) in raw gas to form carbon particles and deposite on the surface of ascension peipe, providing carrier for tar condensation when the temperature decreases to coking temperature. All of the coke layers contain aromatic structure, and from outer surface to inner surface, the aromatic lamellas spacing (d002) gradually decreases, the value of diameter (La) firstly decreases then increases, and the stck high (Lc) and layer number (N) are stable first then increase. The graphitizing process of the coking layer is from inner layer to outer layer, and —COOH and C—O structures on the edge of the aromatic layers degrade and peel out to form highly regular conjugate structure. The C element in the coke layer is in the form of mixture of crystalline carbon and amorphous carbon. The above research provides experimental and theoretical basis for solving problems of coke and corrosion of ascension pipe, improving heat exchange efficiency, effectively recovering sensible heat of raw gas and decreasing energy consumption of coking enterprises.
王 浩,金保昇,王晓佳,余 波,曹 俊. 焦炉上升管内壁结焦炭层的光谱学分析及结焦机理研究[J]. 光谱学与光谱分析, 2019, 39(10): 3148-3153.
WANG Hao, JIN Bao-sheng, WANG Xiao-jia, YU Bo, CAO Jun. Spectroscopical Analysis and Coking Mechanisim of Char Layer in Ascension Pipe of Coke Oven. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2019, 39(10): 3148-3153.
[1] Gao Y L, Chen S L, Wei Y Q, et al. Chemical Engineering Journal, 2017, 326: 528.
[2] YUE Yi-feng, ZHANG Zhong-xiao, HU Guang-tao(岳益锋,张忠孝,胡广涛). Clean Coal Technology(洁净煤技术),2012, 18(4): 61.
[3] Lin W, Feng Y H, Zhang X X. Applied Thermal Engineering, 2015, 81: 353.
[4] Smolka J, Slupik L, Fic A, et al. Fuel, 2016, 165: 94.
[5] ZHANG Zheng, YU Hong-ling, YANG Dong-wei, et al(张 政,郁鸿凌,杨东伟,等). Clean Coal Technology(洁净煤技术),2012, 18(1): 79.
[6] Buczynski R, Weber R, Kim R, et al. Fuel, 2018, 225: 443.
[7] Wiatowski M, Kapusta K, Stańczyk K. Fuel, 2017, 208: 595.
[8] SHI Qiang, ZHANG Zhong-xiao, CAO Xian-chang, et al(史 强,张忠孝,曹先常,等). Journal of China Coal Society,2014, 39(11): 35.
[9] CAO Xian-chang, SHI Qiang, XU Zheng, et al(曹先常,史 强,徐 正,等). Clean Coal Technology(洁净煤技术),2014, 20(3): 83.
[10] Zazzaq R, Li C S, Zhang S J. Fuel, 2013, 113(11): 287.
[11] HOU Kang, WU Jian-jun, SHANG Xiao-ling, et al(侯 康,武建军,尚晓玲,等). Chemical Industry and Engineering Progress(化工进展),2017, 36(3): 900.
[12] ZHANG Shuo, ZHANG Xiao-dong, YANG Yan-hui, et al(张 硕,张小东,杨延辉,等). Spectroscopy and Spectral Analysis(光谱学与光谱分析),2017, 37(10): 3220.
[13] SONG Yin-min, LI Na, BAN Yan-peng, et al(宋银敏,李 娜,班延鹏,等). Journal of Fuel Chemistry and Technology(燃料化学学报),2017, 45(12): 1417.
[14] Georgakopoulos A. Energy Sources, 2003, 25(10): 995.
[15] ZHAO Yi-jun, FENG Dong-dong, ZHANG Yu, et al(赵义军,冯冬冬,张 宇,等). Journal of Harbin Institute of Technology(哈尔滨工业大学学报),2017, 49(7): 74.
[16] LEI Ming, SUN Cen, WANG Chun-bo(雷 鸣,孙 岑,王春波). Journal of Fuel Chemistry and Technology(燃料化学),2018, 46(8): 925.