Micromechanism of deposition for initial layer sediments of boiler

LI Ming-qiang; DU Mei-fang; WU Xiao-jiang; ZHOU Lei; ZHANG Zhong-xiao

Volume 41 Issue 02

Feb. 2013

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Article Navigation > Journal of Fuel Chemistry and Technology > 2013 > 41(02): 157-162

LI Ming-qiang, DU Mei-fang, WU Xiao-jiang, ZHOU Lei, ZHANG Zhong-xiao. Micromechanism of deposition for initial layer sediments of boiler[J]. Journal of Fuel Chemistry and Technology, 2013, 41(02): 157-162.

Citation:

LI Ming-qiang, DU Mei-fang, WU Xiao-jiang, ZHOU Lei, ZHANG Zhong-xiao. Micromechanism of deposition for initial layer sediments of boiler[J]. Journal of Fuel Chemistry and Technology, 2013, 41(02): 157-162.

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Micromechanism of deposition for initial layer sediments of boiler

1.
College of Science, University of Shanghai for Science and Technology, Shanghai 200093, China;
2.
Shanghai Boiler Works Co. Ltd, Shanghai 200245, China;
3.
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Received Date: 2012-06-06
Rev Recd Date: 2012-08-28
Publish Date: 2013-02-28

Abstract

Abstract

The analysis of XRD indicates that slag is similar with minerals in the initial sediments. However, the proportion of bauxite Al₂O₃, hematite Fe₂O₃ has a big difference. The electric structure, elastic constants of Al₂O₃ and Fe₂O₃ were calculated using the ultra soft pseudo-potential plane-wave method based on the first-principles. The results show that from the structure of material, the accumulation mode of Al³⁺ and O^2- in Al₂O₃ crystal is sparser than that of Fe³⁺ and O^2- in Fe₂O₃, which is the reason for their different properties. For their chemical bonds in the direction of <100> and in tangential, Fe-O is more easy to deformate and fracture than Al-O, leading to Fe₂O₃ deposition in the clean water wall. For Fe₂O₃, tangential surface plays a key role for its deposit.
- elastic propertie,
- electronic structure,
- coal ash,
- first-principles

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References(18)

References

徐志明, 杨善让, 王建国, 孙灵芳,甘云华. 管式换热器积灰特性的实验研究[J]. 工程热物理学报, 2002, 23(2): 203-205. ( XU Zhi-ming,YANG Shan-rang,WANG Jian-guo, SUN Ling-fang, GAN Yun-hua.Experimental inverstigation on the fouling characteristics of tube heat exchanger[J]. Journal of Engineering Thermophysics, 2002, 23(2): 203-205.)

BRYERS R W .The physical and chemical characteristics of Pyrite and their influences on fireside problems in steam generators[J]. J Eng Power Trans ASME, 1976, 98(4): 517-527.

SRINIVASACHAR S, BONI A A, KINETIC A.Model for pyrite transformations in a combustion environment[J]. Fuel, 1989, 68(7): 829-836.

ERICKSON T A, ALLAN S E, MCCOLLOR D P, HURLEYJ P, SRINIVASACHAR S, KANG S G, BAKER J E, MORGAN M E, JOHNSON S A, BORIO R. Modeling of fouling and slagging in coal-fired utility boilers[J]. Fuel Process Technol, 1995, 44(1/3): 155-171.

乌晓江, 张忠孝, 周托, 陈玉爽, 陈国艳, 陆成, 黄凤豹. 气化条件下混煤灰熔融特性及矿物质演变规律[J]. 燃烧科学与技术, 2010, 31(9): 1590-1594. (WU Xiao-jiang, ZHANG Zhong-xiao, ZHOU Tuo, CHEN Yu-shuang, CHEN Guo-yan, LU Cheng, HUANG Feng-bao. Ash fusion characteristics and mineral evolvement of blended ash under gasification condition[J]. Journal of Combustion Science and Technology, 2010, 31(9): 1590-1594.)

WANG H , HABR J N. Modeling of ash deposition in large-scale combustion facilities burning pulverized coal[J]. Prog Energy Combust Sci, 1997, 23(3): 267-282.

盛昌栋, 华永明, 周强泰, 熊斐, 姚洪, 张军. 煤中FeS₂和含铁粘土矿物在锅炉结渣过程中的作用[J]. 燃烧科学与技术, 1999, 5(3): 246-250. (SHENG Chang-dong, HUA Yong-ming, ZHOU Qiang-tai, XIONG Fei, YAO Hong, ZHANG Jun. Investigation of the roles of FeS₂ and iron bearing clay minerals in Pingshuo coal during slagging deposition of pulverized coal fired boiler[J]. Journal of Combustion Science and Technology, 1999, 5(3): 246-250.)

乌晓江, 张忠孝, 徐雪元, 张建文, 刘建斌, 柳公权, 周托, 陈玉爽. 铁系矿物对煤灰相变过程的内在影响规律研究[J]. 工程热物理学报, 2011, 32(8): 1425-1429. (WU Xiao-Jiang, ZHANG Zhong-Xiao, XU Xue-Yuan, ZHANG Jian-Wen, LIU Jian-Bin, LIU Gong-Quan, ZHOU Tuo, CHEN Yu-Shuang. The effect of iron-bearing minerals on coal ash melting behavior[J]. Journal of Engineering Thermophysics, 2011, 32(8): 1425-1429.)

杜晔平, 陈敬超, 冯晶. 不同SnO₂晶体结构的力学性能及电子结构[J]. 物理化学学报, 2009, 25(2): 278-284. (DU Ye-ping, CHEN Jing-chao, FENG Jing. Mechanical properties and electronic structures of various SnO₂ crystal structures[J]. Acta Physico-Chimica Sinica, 2009, 25(2): 278-284.)

王宝俊, 张玉贵, 谢克昌. 量子化学计算在煤的结构与反应性研究中的应用[J]. 化工学报, 2003, 54(4): 477-488. (WANG Bao-jun, ZHANG Yu-gui, XIE Ke-chang. Application of quantum chemistry calculation to investigation on caal structure and reactivity[J]. Journal of Chemical Industry and Engineering(China), 2003, 54(4): 477-488.)

李洁, 杜梅芳, 闫博, 张忠孝. 添加硼砂助熔剂煤灰熔融性的量子化学与实验研究[J]. 燃料化学学报, 2008, 36(5): 519-523. (LI Jie, DU Mei-fang, YAN Bo, ZHANG Zhong-xiao. Quantum and experimental study on coal ash fusion with borax fluxing agent [J]. Journal of Fuel Chemistry and Technology, 2008, 36(5): 519-523.)

陈玉爽, 张忠孝, 乌晓江, 李洁, 管嵘清, 闫博. 配煤对煤灰熔融特性影响的实验与量化研究[J]. 燃料化学学报, 2009, 37(5): 521-526. (CHEN Yu-shuang, ZHANG Zhong-xiao, WU Xiao-jiang, LI Jie, GUAN Rong-qing, YAN Bo. Quantum chemistry calculation and experimental study on coal ash fusion characteristics of blend coal[J]. Journal of Fuel Chemistry and Technology, 2009, 37(5): 521-526.)

PERDEW J P, JACKSON K A, PEDERSON M R, SINGH D J, FIOLHAIS C. Atoms, molecules, solids, and surfaces: Applications of the generalized gradient approximation for exchange and correlation[J]. Phys Rev B, 1992, 46(11): 6671-6687.

SEGALL M D, LINDAN P J D, PROBERT M J . First-principles simulation: ideas, illustrations and the CASTEP code[J]. J Phys: Condens Matter, 2002, 14(11): 2717-2744.

VANDERBILT D. Soft self-consistent pseudopotentials in a generalized eigenvalue formalism[J]. Phys Rev B, 1990, 41(11): 7892-7895.

FISCHER T H, ALMLOF J A. General methods for geometry and wave function optimization[J]. J Phys Chem, 1992, 96(24): 9768-9774.

ISHIZAWA N, MIYATA T, MINATO I, MARUMO F, IWAI S. A structural investigation of ALPHA-Al₂O₃ at 2170K[J]. Acta Crystallogr B, 1980, 36(2): 228-230.

BLAKE R L, HESSEVICK R E, ZOLTAI T, FINGER L W. Refinement of the hematite structure[J]. Am Mineral, 1966, 51(1): 123-129.

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