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


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",
publisher="Zhejiang University Press & Springer",

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%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

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

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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