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Journal of Zhejiang University SCIENCE A 2012 Vol.13 No.3 P.230-238

http://doi.org/10.1631/jzus.A1100206


Influence of ash composition on the sintering behavior during pressurized combustion and gasification process


Author(s):  Ni-jie Jing, Qin-hui Wang, Yu-kun Yang, Le-ming Cheng, Zhong-yang Luo, Ke-fa Cen

Affiliation(s):  State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   qhwang@zju.edu.cn

Key Words:  Ash composition, Sintering temperature, X-ray diffractometer (XRD), Field emission scanning electron microscope/ energy dispersive X-ray spectrometer (FE-SEM/EDS)


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Ni-jie Jing, Qin-hui Wang, Yu-kun Yang, Le-ming Cheng, Zhong-yang Luo, Ke-fa Cen. Influence of ash composition on the sintering behavior during pressurized combustion and gasification process[J]. Journal of Zhejiang University Science A, 2012, 13(3): 230-238.

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author="Ni-jie Jing, Qin-hui Wang, Yu-kun Yang, Le-ming Cheng, Zhong-yang Luo, Ke-fa Cen",
journal="Journal of Zhejiang University Science A",
volume="13",
number="3",
pages="230-238",
year="2012",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1100206"
}

%0 Journal Article
%T Influence of ash composition on the sintering behavior during pressurized combustion and gasification process
%A Ni-jie Jing
%A Qin-hui Wang
%A Yu-kun Yang
%A Le-ming Cheng
%A Zhong-yang Luo
%A Ke-fa Cen
%J Journal of Zhejiang University SCIENCE A
%V 13
%N 3
%P 230-238
%@ 1673-565X
%D 2012
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1100206

TY - JOUR
T1 - Influence of ash composition on the sintering behavior during pressurized combustion and gasification process
A1 - Ni-jie Jing
A1 - Qin-hui Wang
A1 - Yu-kun Yang
A1 - Le-ming Cheng
A1 - Zhong-yang Luo
A1 - Ke-fa Cen
J0 - Journal of Zhejiang University Science A
VL - 13
IS - 3
SP - 230
EP - 238
%@ 1673-565X
Y1 - 2012
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A1100206


Abstract: 
To determine the ash characteristics during fluidized bed combustion and gasification purposes, the investigation of the impacts of chemical composition of Jincheng coal ash on the sintering temperature was conducted. A series of experiments on the sintering behavior at 0.5 MPa was performed using the pressurized pressure-drop technique in the combustion and gasification atmospheres. Meanwhile, the mineral transformations of sintered ash pellets were observed using x-ray diffractometer (XRD) analyzer to better understand the experimental results. In addition, quantitative XRD and field emission scanning electron microscope/energy dispersive X-ray spectrometer (FE-SEM/EDS) analyses of ash samples were used for clarifying the detailed ash melting mechanism. These results show that the addition of Fe2O3 can obviously reduce the sintering temperatures under gasification atmospheres, and only affect a little the sintering temperature under combustion atmosphere. This may be due to the presence of iron-bearing minerals, which will react with other ash compositions to produce low-melting-point eutectics. The FE-SEM/EDS analyses of ash samples with Fe2O3 additive show consistent results with the XRD measurements. The CaO and Na2O can reduce the sintering temperatures under both the combustion and gasification atmospheres. This can be also contributed to the formation of low-melting-point eutectics, decreasing the sintering temperature. Moreover, the fluxing minerals, such as magnetite, anhydrite, muscovite, albite and nepheline, contribute mostly to the reduction of the sintering temperature while the feldspar minerals, such as anorthite, gehlenite and sanidine, can react with other minerals to produce low-melting-point eutectics, and thereby reduce the sintering temperatures.

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Reference

[1]Al-Otoom, A.Y., Bryant, G.W., Elliott, L.K., Skrifvars, B.J., Hupa, M., Wall, T.F., 2000a. Experimental options for determining the temperature for the onset of sintering of coal ash. Energy & Fuels, 14(1):227-233.

[2]Al-Otoom, A.Y., Elliott, L.K., Wall, T.F., Moghtaderi, B., 2000b. Measurement of the sintering kinetics of coal ash. Energy & Fuels, 14(5):994-1001.

[3]Brooker, D.D., Oh, M.S., 1995. Iron sulfide deposition during coal gasification. Fuel Processing Technology, 44(1-3):181-190.

[4]Bryant, G.W., Lucas, J.A., Gupta, S.K., Wall, T.F., 1998. Use of thermomechanical analysis to quantify the flux additions necessary for slag flow in slagging gasifiers fired with coal. Energy & Fuels, 12(2):257-261.

[5]Cen, K.F., Fan, J.R., Chi, Z.H., 1994. Mechanisms and Calculations for Preventing Boilers and Heat Exchangers from Depositing, Slagging, Wearing and Eroding. Science Press, Beijing, China (in Chinese).

[6]Dawes, S.G., Gibbs, G.B., Highley, H., 1988. The British coal/CEGB project on pressurised fluidised bed combustion. Journal of Institute of Energy, 17:17-26.

[7]Delvinquier, V., Fatah, N., Pietrzyk, S., Dauphin, J., Berte, P., Bruyet, B., 1995. Defluidisation at High Temperature in Fluidised Bed of Sand by Addition of Calcium Carbonate. Fluidised Bed Combustion, Heinschel, K.J. (Ed.), ASME, New York, 2:801-806.

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

[9]Ishom, F., Harada, T., Aoyagi, T., Sakanishi, K., Korai, Y., 2002. Problem in PFBC boiler (1): characterization of agglomerate recovered in commercial PFBC boiler. Fuel, 81(11-12):1146-1148.

[10]Jing, N.J., Wang, Q.H., Luo, Z.Y., Cen, K.F., 2012. Effect of the chemical composition on the sintering behavior of Jincheng coal ash under the gasification atmosphere. Chemical Engineering Communications, 199(2):189-202.

[11]Li, J.B., Shen, B.X., Li, H.X., Zhao, J.G., Wang, J.M., 2009. Effect of ferrum-based flux on the melting characteristics of coal ash from coal blends using the Liu-qiao No. 2 Coal Mine in Wan-bei. Journal of Fuel Chemistry and Technology, 37(3):262-265.

[12]Li, W.D., Li, M., Li, W.F., Liu, H.F., 2010. Study on the ash fusion temperatures of coal and sewage sludge mixtures. Fuel, 89:1566-1572.

[13]Lolja, S.A., Haxhi, H., Dhimitri, R., Drushku, S., Malja, A., 2002. Correlation between ash fusion temperatures and chemical composition in Albanian coal ashes. Fuel, 81(17):2257-2261.

[14]McLennan, A.R., Bryant, G.W., Stanmore, B.R., Wall, T.F., 2000. Ash formation mechanisms during pf combustion in reducing conditions. Energy & Fuels, 14(1):150-159.

[15]Ninomiya, Y., Sato, A., 1997. Ash melting behavior under coal gasification conditions. Energy Conversion and Management, 38(10-13):1405-1412.

[16]Seggiani, M., 1999. Empirical correlations of the ash fusion temperatures and temperature of critical viscosity for coal and biomass ashes. Fuel, 78(9):1121-1125.

[17]Sheng, C.D., Li, Y., 2008. Experimental study of ash formation during pulverized coal combustion in O2/CO2 mixtures. Fuel, 87(7):1297-1305.

[18]Skrifvars, B.J., Hupa, M., HiItunen, M., 1992. Sintering of ash during fluidized bed combustion. Industrial & Engineering Chemistry Research, 31(4):1026-1030.

[19]Skrifvars, B.J., Hupa, M., Backman, R., HiItunen, M., 1994. Sintering mechanisms of FBC ashes. Fuel, 73(2):171-176.

[20]Song, W.J., Tang, L.H., Zhu, X.D., Wu, Y.Q., Rong, Y.Q., Zhu, Z.B., Koyama, S., 2009a. Fusibility and flow properties of coal ash and slag. Fuel, 88(2):297-304.

[21]Song, W.J., Tang, L.H., Zhu, X.D., Wu, Y.Q., Zhu, Z.B., Koyama, S., 2009b. Prediction of Chinese coal ash fusion temperatures in Ar and H2 atmospheres. Energy & Fuels, 23:1990-1997.

[22]Song, W.J., Tang, L.H., Zhu, X.D., Wu, Y.Q., Zhu, Z.B., Koyama, S., 2010. Effect of coal ash composition on ash fusion temperatures. Energy & Fuels, 24(1):182-189.

[23]Swanson, M.L., 2000. Modeling of Ash Properties in Advanced Coal-Based Power System. Grand Forks, North Dakota.

[24]ten Brink, H.M., Eenkhoorn, S., Hamburg, G., 1996. A mechanistic study of the formation of slags from iron-rich coals. Fuel, 75(8):952-958.

[25]van Dyk, J.C., Waanders, F.B., Hack, K., 2008. Behaviour of calcium-containing minerals in the mechanism towards in situ CO2 capture during gasification. Fuel, 87(12):2388-2393.

[26]van Dyk, J.C., Benson, S.A., Laumb, M.L., Waanders, B., 2009. Coal and coal ash characteristics to understand mineral transformations and slag formation. Fuel, 88(6):1057-1063.

[27]Vassilev, S.V., Kitanob, K., Takedab, S., Tsurueb, T., 1995. Influence of mineral and chemical composition of coal ashes on their fusibility. Fuel Processing Technology, 45(1):27-51.

[28]Vassileva, C.G., Vassilev, S.V., 2006. Behaviour of inorganic matter during heating of Bulgarian coals 2. Subbituminous and bituminous coals. Fuel Processing Technology, 87(12):1095-1116.

[29]Wall, T.F., Liua, G.S., Wua, H.W., Roberts, D.G., Benfell, K.E., Guptaa, S., Lucas, J.A., Harris, D.J., 2002. The effects of pressure on coal reactions during pulverised coal combustion and gasification. Progress in Energy and Combustion Science, 28(5):405-433.

[30]Wang, Q.H., Jing, N.J., Luo, Z.Y., Li, X.M., Jie, T., 2010. Experiments on the effect of chemical components of coal ash on the sintering temperature. Journal of China Coal Society, 35(6):1015-1020 (in Chinese).

[31]Wu, H.W., Bryant, G., Wall, T., 2000. The effect of pressure on ash formation during pulverized coal combustion. Energy & Fuels, 14(4):745-750.

[32]Yang, J.K., Xiao, B., Boccaccini, A.R., 2009. Preparation of low melting temperature glass-ceramics from municipal waste incineration fly ash. Fuel, 88(7):1275-1280.

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