Sintering behavior of different coal ashes in catalytic coal gasification process

MAO Yan-dong; JIN Ya-dan; LI Ke-zhong; BI Ji-cheng; LI Jin-lai; XIN Feng

Volume 43 Issue 04

Apr. 2015

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MAO Yan-dong, JIN Ya-dan, LI Ke-zhong, BI Ji-cheng, LI Jin-lai, XIN Feng. Sintering behavior of different coal ashes in catalytic coal gasification process[J]. Journal of Fuel Chemistry and Technology, 2015, 43(04): 402-409.

Citation:

MAO Yan-dong, JIN Ya-dan, LI Ke-zhong, BI Ji-cheng, LI Jin-lai, XIN Feng. Sintering behavior of different coal ashes in catalytic coal gasification process[J]. Journal of Fuel Chemistry and Technology, 2015, 43(04): 402-409.

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Sintering behavior of different coal ashes in catalytic coal gasification process

1.
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2.
State Key Lab of Coal-based Low Carbon Energy, Enn Technology & Development Co. Ltd, Langfang 065001, China

Received Date: 2014-12-17
Publish Date: 2015-04-30

Abstract

Abstract

A homemade pressurized pressure-drop measuring device and X-ray diffractometer (XRD) analyzer were used to determine the effects of alkali catalyst addition and different chemical compositions of nine kinds of coal ashes on the ash sintering temperature. The results show that the sintering temperature of WJT coal ash containing higher Fe and Ca compositions declines markedly after adding potassium carbonate catalyst. K minerals react easily with Fe and Ca minerals to produce low-melting-point eutectics, which accelerates the sintering and agglomeration. The sintering temperatures of various coal ashes are closely related to the contents of Si, Al, Fe and Ca in coal ashes. The sintering temperatures increase for the coal ash with higher content of silicon and aluminum, but decrease for the coal ash with higher content of calcium and iron in ash. Adding K catalyst can promote the slagging by forming eutectic matters, especially in the presence of calcium and iron. The three-element phase diagrams of CaO-SiO₂-Al₂O₃, FeO-SiO₂-Al₂O₃ could explain the sintering temperatures variance.
- catalytic coal gasification,
- sintering temperature,
- pressure-drop measuring technique,
- coal ash composition,
- phase diagram

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References(37)

References

HIRSCH R L, GALLAGEHER J E, LESSARD J R, WESSELHOFT R D. Catalytic coal gasification:An emerging technology[J]. Science,1982, 215(1):121-127.

NAHAS N C. Exxon catalytic coal gasification process[J]. Fuel, 1983, 62(2):239-241.

毛燕东, 李克忠, 孙志强, 毕继诚, 辛峰, 李金来. 小型流化床燃煤自供热煤催化气化特性研究[J]. 高等化学工程学报, 2013, 27(5):798-804. (MAO Yan-dong, LI Ke-zhong, SUN Zhi-qiang, BI Ji-cheng, XIN Feng, LI Jin-lai. Characteristics of catalytic coal gasification in lab scale auto thermal fluidized bed[J]. J Chem Eng Chin Univ, 2013, 27(5):798-804.)

毛燕东, 毕继诚, 李金来, 甘中学. 一种由煤催化气化制甲烷的方法:CN, 201010532452.6[P]. 2010-11-02. (MAO Yan-dong, BI Ji-cheng, LI Jin-lai, GAN Zhong-xue. A method for producing methane by catalytic gasification of coal:CN, 201010532452.6[P]. 2010-11-02.)

毛燕东, 金亚丹, 王会芳, 郑岩, 李克忠, 毕继诚. 煤催化气化工艺中碱金属腐蚀刚玉质耐火材料的实验研究[J]. 燃料化学学报, 2014, 42(11):1332-1339. (MAO Yan-dong, JIN Ya-dan, WANG Hui-fang, ZHENG Yan, LI Ke-zhong, BI Ji-cheng. Experimental research on corrosions of corundum refractory by alkali metals in catalytic coal gasification process[J]. J Fuel Chem Technol, 2014, 42(11):1332-1339.)

PAN Y G, LIU M Z, JI C Y, HU M J, WANG Z. To prepare the town gas by catalytic gasification of Da-Tong coal under elevated pressure:Ⅰ. The characteristics of catalytic gasification of Da-Tong coal and its coke[J]. J East China Sch Chem Eng Technol, 1986, 12(1):25-33.

NAHAS N C. Process for the catalytic gasification of coal[P]:US, 4077778. 1978-03-07.

HIPPO E J, SHETH A C. Mild catalytic steam gasification process[P]:US, 2007/0000177 A1. 2007-01-04.

VERAA M J, BELL A T. Effect of alkali metal catalysts on gasification of coal char[J]. Fuel, 1978, 57(4):194-200.

MCKEE D W, SPIRO C L, KOSKY P G. Catalysis of coal char gasification by alkali metal salts[J]. Fuel, 1983, 62(2):217-220.

YEBOAH Y D, XU Y, SHETH A C. Catalytic gasification of coal using eutectic salts:Identification of eutectics[J]. Carbon, 2003, 41(2):203-214.

SHETH A C, YEBOAH Y D, GODAVARTY A, SASTRY C. Catalytic gasification of coal using eutectic salts:Reaction kinetics with binary and ternary eutectic catalysts[J]. Fuel, 2003, 82(3):305-317.

SCHMITT V, KALTSCHMITT M. Effect of straw proportion and Ca and Al-containing additives on ash composition and sintering of wood-straw pellets[J]. Fuel, 2013, 109(7):551-558.

LIN W, JOHANSEN K D, FRANDSEN F. Agglomeration in bio-fuel fired fluidized bed combustors[J]. Chem Eng J, 2003, 96(2):171-185.

姚冬林, 金保升, 肖刚. 生物质流化床燃烧/气化的烧结特性与机理综述[J]. 锅炉技术, 2009, 40(4):76-80. (YAO Dong-lin, JIN Bao-sheng, XIAO Gang. Review on biomass fluidized bed combustion/gasification sintering characteristic and mechanism[J]. Boiler Technol, 2009, 40(4):76-80.)

KHAN A, DE J W, JANSENS P, SPLIETHOFF H. Biomass combustion in fluidized bed boilers:Potential problems and remedies[J]. Fuel Process Technol, 2009, 90(1):21-50.

DEMIRBAS A. Potential applications of renewable energy sources, biomass combustion problems in boiler power systems and combustion related environmental issues[J]. Prog Energy Combust Sci, 2005, 31(2):171-192.

SAMI M, ANNAMALAI K, WOOLDRIDGE M. Co-firing of coal and biomass fuel blends[J]. Prog Energy Combust Sci, 2001, 27(2):171-214.

NIELSEN H, FRANDSEN F, DAM-J K, BAXTER L. The implications of chlorine associated corrosion on the operation of biomass-fired boilers[J]. Prog Energy Combust Sci, 2000, 26(3):283-298.

ROMEO L M, GARETA R. Hybrid system for fouling control in biomass boilers[J]. Eng Appl Artif Intell, 2006, 19(8):915-925.

EASTERLY J L, BURNHAM M. Overview of biomass and waste fuel resources for power production[J]. Biomass Bioenergy, 1996, 10(2):79-92.

HEINZEL T, SIEGLE V, SPLIETHOFF H, HEIN K. Investigation of slagging in pulverized fuel co-combustion of biomass andcoal at a pilot-scale test facility[J]. Fuel Process Technol, 1998, 54(1):109-125.

BARTELS M, LIN W G, NIJENHUIS J, KAPTEIJN F, OMMEN J R. Agglomeration in fluidized beds at high temperatures:Mechanisms, detection and prevention[J]. Prog Energy Combust Sci, 2008, 34(5):633-666.

GUPTA S K, GUPTA R P, BRYANT G W, WALL T F. The effect of potassium on the fusibility of coal ashes with high silica andalumina levels[J]. Fuel, 1998, 77(11):1195-1201.

AL-OTOOM AY, ELLIOTT L K, MOGHTADERI B, WALL T F. The sintering temperature of ash, agglomeration, and defluidisation in a bench scale PFBC[J]. Fuel, 2005, 84(1):109-114.

VASSILEV S V, KUNIHIRO K, SHOHEI T. Influence of mineral and chemical composition of coal ashes on their fusibility[J]. Fuel Process Technol, 1995, 45(1):27-51.

王勤辉, 揭涛, 李小敏, 骆仲泱, 景妮洁, 岑可法. 反应气氛对不同煤灰烧结温度影响的研究[J]. 燃料化学学报, 2010,30(1):17-22. (WANG Qin-hui, JIE Tao, LI Xiao-min, LUO Zhong-yang, JING Ni-jie, CEN Ke-fa. Experiments of the effects of reaction atmosphere on coal ash sintering temperature[J]. J Fuel Chem Technol, 2010, 30(1):17-22.)

JING N J, WANG Q H, YANGY K, CHENG L M, LUO Z Y, CEN K F. Influence of ash composition on the sintering behavior during pressurized combustion and gasification process[J]. Appl Phys & Eng, 2012, 13(3):230-238.

李振珠, 李风海, 薛兆民, 房倚天. 低阶煤气化结渣特性的研究进展[J]. 菏泽学院学报, 2013, 35(5):50-54. (LI Zhen-zhu, LI Feng-hai, XUE Zhao-min, FANG Yi-tian. A research progress on slagging characteristics during gasification of low-rank coal[J]. J Heze Univ, 2013, 35(5):50-54.)

LUAN C, YOU C F, ZHANG D K. Composition and sintering characteristics of ashes from co-firing of coal and biomass in a laboratory-scale drop tube furnace[J]. Energy, 2014, 69(5):562-570.

AL-OTOOM A Y, BRYANT G, ELLIOTT L, SKRIFVARS B, HUPA M, WALL T. Experimental options for determining the temperature for the onset of sintering of coal ash[J]. Energy Fuels, 2000, 14(1):227-233.

HAYKIRIA H, YAMAN S, KUCUKBAYRAK S. Effect of biomass on temperatures of sintering and initial deformation of lignite ash[J]. Fuel, 2010, 89(10):3063-3068.

WU X J, ZHANG Z X, PAOI G L, HE X, CHEN Y S, KOBAYASHI N, MORI S. Behavior of mineral matters in Chinese coal ash melting during char-CO₂/H₂O gasification reaction[J]. Energy Fuels, 2009, 23(5):2420-2428.

VAN J C, BENSON S A, LAUMB M L, WAANDERS B. Coal and coal ash characteristics to understand mineral transformations and slag formation[J]. Fuel, 2009, 88(11):1057-1063.

HFFMANU G P, HUGGINS F E, DUNMYRE G R. Investigation of the high-temperature behaviour of coal ash in reducing and oxidizing atmospheres[J]. Fuel, 1981, 60(7):585-597.

RUSSELL N V, WIGLEY F, WILLIAMSON J. The roles of lime and iron oxide on the formation of ash and deposits in PF combustion[J]. Fuel, 2002, 81(5):673-681.

GUPTA S K, GUPTA R P, BRYANT G W, WALL T F. The effect of potassium on the fusibility of coal ashes with high silica and alumina levels[J]. Fuel, 1998, 77(11):1195-1201.

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