Complete quantitative data of the chemical (proximate, ultimate, and ash analyses) and mineral (in low-temperature ash (LTA) and various high-temperature ashes (HTA)) compositions of 21 coals were used to investigate the modes of occurrences and high-temperature behaviors of the minerals in coals and their influence on ash fusibility. The common minerals present in the low-temperature ashes (LTA) are kaolinite, quartz, muscovite, calcite, gypsum, pyrite, and siderite. The samples were divided into two groups according to the hemispherical temperature for a comparative study of the behavior of mineral matters. Results show that the average number of mineral species (ANMS) and amorphous substances (AS) in the LTAs of the two groups are essentially the same. The ANMS in both the low and high (ash fusion temperatures, AFT) ash samples go through the same tendency of a slight reduction at first, an increase, and finally, a significant reduction. As the temperature increases, the ANMS in the low-AFT ash is initially higher and then lower than the high-AFT ash, whereas the tendency of the AS is quite the opposite. The ash melting process is divided into three stages, and the AFTs are related to different degrees of the eutectic stage.
Issue Section:
Energy Systems Analysis
References
1.
Ni
, W.
, and Chen
, Z.
, 2011
, “Synergistic Utilization of Coal and Other Energy—Key to Low Carbon Economy
,” Front. Energy
, 5
(1
), pp. 1
–19
.2.
Qiu
, J. R.
, Li
, F.
, Zheng
, Y.
, Zheng
, C. G.
, and Zhou
, H. C.
, 1999
, “The Influences of Mineral Behaviour on Blended Coal Ash Fusion Characteristics
,” Fuel
, 78
(8
), pp. 963
–969
.3.
Ward
, C. R.
, 2002
, “Analysis and Significance of Mineral Matter in Coal Seams
,” Int. J. Coal Geol.
, 50
(1
), pp. 135
–168
.4.
Winegartner
, E. C.
, and Rhodes
, B. T.
, 1975
, “An Empirical Study of the Relation of Chemical Properties to Ash Fusion Temperatures
,” ASME J. Eng. Gas Turbine Power
, 97
(3
), pp. 395
–403
.5.
Seggiani
, M.
, and Pannocchia
, G.
, 2003
, “Prediction of Coal Ash Thermal Properties Using Partial Least-Squares Regression
,” Ind. Eng. Chem. Res.
, 42
(20
), pp. 4919
–4926
.6.
Özbayoğlu
, G.
, and Evren Özbayoğlu
, M.
, 2006
, “A New Approach for the Prediction of Ash Fusion Temperatures: A Case Study Using Turkish Lignites
,” Fuel
, 85
(4
), pp. 545
–552
.7.
Song
, W. J.
, Tang
, L. H.
, Zhu
, X. D.
, Wu
, Y. Q.
, Zhu
, Z. B.
, and Koyama
, S.
, 2009
, “Prediction of Chinese Coal Ash Fusion Temperatures in Ar and H2 Atmospheres
,” Energy Fuel
, 23
(4
), pp. 1990
–1997
.8.
Zhao
, B.
, Zhang
, Z.
, and Wu
, X.
, 2010
, “Prediction of Coal Ash Fusion Temperature by Least-Squares Support Vector Machine Model
,” Energy Fuel
, 24
(5
), pp. 3066
–3071
.9.
Vassilev
, S. V.
, Kitano
, K.
, Takeda
, S.
, and Tsurue
, T.
, 1995
, “Influence of Mineral and Chemical Composition of Coal Ashes on Their Fusibility
,” Fuel Process. Technol.
, 45
(1
), pp. 27
–51
.10.
Vassilev
, S. V.
, and Vassileva
, C. G.
, 1998
, “Comparative Chemical and Mineral Characterization of Some Bulgarian Coals
,” Fuel Process. Technol.
, 55
(1
), pp. 55
–69
.11.
Vassileva
, C. G.
, and Vassilev
, S. V.
, 2005
, “Behaviour of Inorganic Matter During Heating of Bulgarian Coals: 1. Lignites
,” Fuel Process. Technol.
, 86
(12–13
), pp. 1297
–1333
.12.
Vassileva
, C. G.
, and Vassilev
, S. V.
, 2006
, “Behaviour of Inorganic Matter During Heating of Bulgarian Coals: 2. Subbituminous and Bituminous Coals
,” Fuel Process. Technol.
, 87
(12
), pp. 1095
–1116
.13.
Vassilev
, S. V.
, and Vassileva
, C. G.
, 2009
, “A New Approach for the Combined Chemical and Mineral Classification of the Inorganic Matter in Coal: 1. Chemical and Mineral Classification Systems
,” Fuel
, 88
(2
), pp. 235
–245
.14.
Vassilev
, S. V.
, Vassileva
, C. G.
, Baxter
, D.
, and Andersen
, L. K.
, 2009
, “A New Approach for the Combined Chemical and Mineral Classification of the Inorganic Matter in Coal: 2. Potential Applications of the Classification Systems
,” Fuel
, 88
(2
), pp. 246
–254
.15.
Vassilev
, S. V.
, Vassileva
, C. G.
, Baxter
, D.
, and Andersen
, L. K.
, 2010
, “Relationships Between Chemical and Mineral Composition of Coal and Their Potential Applications as Genetic Indicators: Part 1. Chemical Characteristics
,” Geol. Balc.
, 39
(3
), pp. 21
–41
.16.
Vassilev
, S. V.
, Vassileva
, C. G.
, Baxter
, D.
, and Andersen
, L. K.
, 2010
, “Relationships Between Chemical and Mineral Composition of Coal and Their Potential Applications as Genetic Indicators. Part 2. Mineral Classes, Groups and Species
,” Geol. Balc.
, 39
(3
), pp. 43
–67
.17.
Van Dyk
, J. C.
, Melzer
, S.
, and Sobiecki
, A.
, 2006
, “Mineral Matter Transformation During Sasol–Lurgi Fixed Bed Dry Bottom Gasification—Utilization of HT-XRD and FactSage Modelling
,” Miner. Eng.
, 19
(10
), pp. 1126
–1135
.18.
Bai
, J.
, Li
, W.
, and Li
, B.
, 2008
, “Characterization of Low-Temperature Coal Ash Behaviors at High Temperatures Under Reducing Atmosphere
,” Fuel
, 87
(4–5
), pp. 583
–591
.19.
Fallavena
, V. L. V.
, de Abreu
, C. S.
, Inácio
, T. D.
, Azevedo
, C. M. N.
, Pires
, M.
, Ferret
, L. S.
, Fernandes
, I. D.
, and Tarazona
, R. M.
, 2014
, “Determination of Mineral Matter in Brazilian Coals by Thermal Treatments
,” Fuel Process. Technol.
, 125
(9
), pp. 41
–50
.20.
Chakravarty
, S.
, Mohanty
, A.
, Banerjee
, A.
, Tripathy
, R.
, Mandal
, G. K.
, Basariya
, M. R.
, and Sharma
, M.
, 2015
, “Composition, Mineral Matter Characteristics and Ash Fusion Behavior of Some Indian Coals
,” Fuel
, 150
(3
), pp. 96
–101
.21.
Wen
, C.
, Xu
, M.
, Zhou
, K.
, Yu
, D.
, Zhan
, Z.
, and Mo
, X.
, 2015
, “The Melting Potential of Various Ash Components Generated From Coal Combustion: Indicated by the Circularity of Individual Particles Using CCSEM Technology
,” Fuel Process. Technol.
, 133
, pp. 128
–136
.22.
Reinmöller
, M.
, Klinger
, M.
, Schreiner
, M.
, and Gutte
, H.
, 2015
, “Relationship Between Ash Fusion Temperatures of Ashes From Hard Coal, Brown Coal, and Biomass and Mineral Phases Under Different Atmospheres: A Combined FactSage™ Computational and Network Theoretical Approach
,” Fuel
, 151
, pp. 118
–123
.23.
Vassilev
, S. V.
, and Tascón
, J. M. D.
, 2003
, “Methods for Characterization of Inorganic and Mineral Matter in Coal: A Critical Overview
,” Energy Fuel
, 17
(2
), pp. 271
–281
.24.
Gupta
, R.
, 2007
, “Advanced Coal Characterization: A Review
,” Energy Fuel
, 21
(2
), pp. 451
–460
.25.
Bernasconi
, A.
, Dapiaggi
, M.
, and Gualtieri
, A. F.
, 2014
, “Accuracy in Quantitative Phase Analysis of Mixtures With Large Amorphous Contents. The Case of Zircon-Rich Sanitary-Ware Glazes
,” J. Appl. Crystallogr.
, 47
(1
), pp. 136
–145
.26.
Gualtieri
, A. F.
, Riva
, V.
, Bresciani
, A.
, Maretti
, S.
, Tamburini
, M.
, and Viani
, A.
, 2014
, “Accuracy in Quantitative Phase Analysis of Mixtures With Large Amorphous Contents. The Case of Stoneware Ceramics and Bricks
,” J. Appl. Crystallogr.
, 47
(3
), pp. 835
–846
.27.
Ward
, C.
, and French
, D.
, 2006
, “Determination of Glass Content and Estimation of Glass Composition in Fly Ash Using Quantitative X-Ray Diffractometry
,” Fuel
, 85
(16
), pp. 2268
–2277
.28.
Ibáñez
, J.
, Font
, O.
, Moreno
, N.
, Elvira
, J. J.
, Alvarez
, S.
, and Querol
, X.
, 2013
, “Quantitative Rietveld Analysis of the Crystalline and Amorphous Phases in Coal Fly Ashes
,” Fuel
, 105
(2
), pp. 314
–317
.29.
Wang
, Y.
, Wen
, J.
, Guo
, L.
, and Zhang
, J.
, 2012
, “Influence of Oxygen-Containing Functional Groups on Carbon Monoxide Occurs in Low Rank Coals
,” Proc. Eng.
, 45
(2
), pp. 967
–972
.30.
Zhang
, J.
, Han
, C.
, Yan
, Z.
, Liu
, K.
, Xu
, Y.
, Sheng
, C.
, and Pan
, W.
, 2001
, “The Varying Characterization of Alkali Metals (Na, K) From Coal During the Initial Stage of Coal Combustion
,” Energy Fuel
, 15
(4
), pp. 786
–793
.31.
Silva
, L. F. O.
, Izquierdo
, M.
, Querol
, X.
, Finkelman
, R. B.
, Oliveira
, M. L. S.
, Wollenschlager
, M.
, Towler
, M.
, Pérez-López
, R.
, and Macias
, F.
, 2011
, “Leaching of Potential Hazardous Elements of Coal Cleaning Rejects
,” Environ. Monit. Assess.
, 175
(1–4
), pp. 109
–126
.32.
Kechang
, X.
, 2002
, Coal Structure and Its Reactivity
, Science Press
, Beijing, China
.33.
Kopyscinski
, J.
, Habibi
, R.
, Mims
, C. A.
, and Hill
, J. M.
, 2013
, “K2CO3-Catalyzed CO2 Gasification of Ash-Free Coal: Kinetic Study
,” Energy Fuel
, 27
(8
), pp. 4875
–4883
.34.
Benson
, S. A.
, and Holm
, P. L.
, 1985
, “Comparison of Inorganics in Three Low-Rank Coals
,” Ind. Eng. Chem. Prod. Res. Dev.
, 24
(1
), pp. 145
–149
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