Aggregating structure in coal water slurry studied by eDLVO theory and fractal dimension
Received date: 24 Aug 2020
Accepted date: 30 Nov 2020
Published date: 15 Apr 2023
Copyright
Coal water slurry gasification is a main source of hydrogen in the developing hydrogen economy. Moreover, biomass and waste can be added, making gasification process greener. To expand the application of coal water slurry and gasification process, it is necessary to understand the micro-structure in this large particle suspension system. In this paper, the micro-structure in coal water slurry was studied by extended DLVO (eDLVO) theory and fractal dimension, which is used to explain the mechanism of stability in large particle suspension systems. The interaction between two coal particles was characterized from the interparticle potential and energy barrier based on the eDLVO theory. The rheology and stability between different types of coals are measured and explained by the aggregating structure and fractal dimension in coal water slurry. The results indicated that there would be an aggregating structure in high rank coals, due to the interparticle potential caused by the surface properties, but probably not in low rank coals. This aggregating structure can be described and characterized by fractal dimension. The aggregation of particles is the source of the stability for high rank coals, as the close-packed 3D network structure in large particle suspension can support coal particles from settling down. The results have demonstrated that the combination of the eDLVO theory and rheological measurement is an effective way to investigate the stability of large particle suspension systems.
Key words: coal water slurry; extended DLVO (eDLVO); fractal dimension; stability
Qiang LI , Qian WANG , Jian HOU , Jiansheng ZHANG , Yang ZHANG . Aggregating structure in coal water slurry studied by eDLVO theory and fractal dimension[J]. Frontiers in Energy, 2023 , 17(2) : 306 -316 . DOI: 10.1007/s11708-021-0736-1
1 |
Li Q, Zhang J. Coal gasification. In: Cheng Y, Jin Y, eds. Multiphase Reactor Engineering for Clean and Low-Carbon Energy Applications. Wiley, 2017
|
2 |
Strizhak P A, Vershinina K Y. Maximum combustion temperature for coal-water slurry containing petrochemicals. Energy, 2017, 120: 34–46
|
3 |
Papachristodoulou G, Trass O. Coal slurry fuel technology. Canadian Journal of Chemical Engineering, 1987, 65(2): 177–201
|
4 |
Duan Q, Zhang S, Duan J. Development outlook and preparation and application technology of coal water mixture. Coal Science and Technology, 2017, 45: 205–213 (in Chinese)
|
5 |
Wan W, Dai Z, Li C,
|
6 |
Shim H, Jung S, Wang H Y,
|
7 |
Zhang Y, Xu Z, Tu Y,
|
8 |
Yi S, Hao L, Li S,
|
9 |
Wang C, Zhao H, Dai Z,
|
10 |
Liu P, Zhu M, Zhang Z,
|
11 |
Li W, Li W, Liu H,
|
12 |
Botsaris G D, Glazman Y M. Stability and rheology of coal slurries. In: Botsaris G D, Glazman Y M, eds. Interfacial Phenomena in Coal Technology. New York: Marcel Dekker Inc., 1989
|
13 |
Usui H, Saeki T, Hayashi K,
|
14 |
Dinçer H, Boylu F, Sirkeci A A,
|
15 |
Laskowski J. Coal Flotation and Fine Coal Utilization. Houston: Gulf Professional Publishing, 2001
|
16 |
Li Q, Yang D, Liu Q,
|
17 |
Derjaguin B V, Churaev N V, Muller V M. The Derjaguin–Landau–Verwey–Overbeek (DLVO) theory of stability of lyophobic colloids. In: Surface Forces. Springer, 1987
|
18 |
Chaturvedi T, Schembre J M, Kovscek A R. Spontaneous imbibition and wettability characteristics of Powder River Basin coal. International Journal of Coal Geology, 2009, 77(1–2): 34–42
|
19 |
Laskowski J, Kitchener J A. The hydrophilic—hydrophobic transition on silica. Journal of Colloid and Interface Science, 1969, 29(4): 670–679
|
20 |
Israelachvili J, Pashley R. The hydrophobic interaction is long range, decaying exponentially with distance. Nature, 1982, 300(5890): 341–342
|
21 |
Yotsumoto H, Yoon R H. Application of extended DLVO theory: I. stability of rutile suspensions. Journal of Colloid and Interface Science, 1993, 157(2): 426–433
|
22 |
Yotsumoto H, Yoon R H. Application of extended DLVO theory: II. stability of silica suspensions. Journal of Colloid and Interface Science, 1993, 157(2): 434–441
|
23 |
Boinovich L. DLVO forces in thin liquid films beyond the conventional DLVO theory. Current Opinion in Colloid & Interface Science, 2010, 15(5): 297–302
|
24 |
Yu Y, Ma L, Xu H,
|
25 |
Wang C, Harbottle D, Liu Q,
|
26 |
Deng M, Xu Z, Liu Q. Impact of gypsum supersaturated process water on the interactions between silica and zinc sulphide minerals. Minerals Engineering, 2014, 55: 172–180
|
27 |
Tao D. Role of bubble size in flotation of coarse and fine particles—a review. Separation Science and Technology, 2005, 39(4): 741–760
|
28 |
Zhang M, Liu Q, Liu J. Extended DLVO theory applied to coal slime-water suspensions. Journal of Central South University, 2012, 19(12): 3558–3563
|
29 |
Piñeres J, Barraza J. Energy barrier of aggregates coal particle–bubble through the extended DLVO theory. International Journal of Mineral Processing, 2011, 100(1–2): 14–20
|
30 |
Yoon R, Mao L. Application of extended DLVO theory, IV: derivation of flotation rate equation from first principles. Journal of Colloid and Interface Science, 1996, 181(2): 613–626
|
31 |
Kaji R, Muranaka Y, Miyadera H,
|
32 |
Roh N S, Shin D H, Kim D C,
|
33 |
Mewis J, Wagner N J. Colloidal Suspension Rheology. Cambridge: Cambridge University Press, 2012
|
34 |
Ofori P, Nguyen A V, Firth B,
|
35 |
Bushell G C, Yan Y D, Woodfield D,
|
36 |
Liao J Y H, Selomulya C, Bushell G,
|
37 |
Bushell G C, Yan Y D, Woodfield D,
|
38 |
He Y B, Laskowski J S. Contact angle measurements on discs compressed from fine coal. Coal Preparation, 1992, 10(1–4): 19–36
|
39 |
Qiu X, Zhou M, Yang D,
|
40 |
Georgakopoulos A. Study of low rank Greek coals using FTIR spectroscopy. Energy Sources, 2003, 25(10): 995–1005
|
41 |
Yoon R, Flinn D H, Rabinovich Y I. Hydrophobic interactions between dissimilar surfaces. Journal of Colloid and Interface Science, 1997, 185(2): 363–370
|
42 |
Pazhianur R, Yoon R. Model for the origin of hydrophobic force. Mining, Metallurgy & Exploration, 2003, 20(4): 178–184
|
43 |
Xu Z, Yoon R H. The role of hydrophobia interactions in coagulation. Journal of Colloid and Interface Science, 1989, 132(2): 532–541
|
44 |
Israelachvili J N. Chapter 13–van der Waals forces between particles and surfaces. In: Intermolecular & Surface Forces. Academic Press, 2011, 253–289
|
45 |
Quemada D, Berli C. Energy of interaction in colloids and its implications in rheological modeling. Advances in Colloid and Interface Science, 2002, 98(1): 51–85
|
46 |
Soni G. Development and validation of a simulator based on a first-principle flotation model. Dissertation for the Doctoral Degree. Blacksburg, US: Virginia Polytechnic Institute and State University, 2013
|
47 |
Biletskyy V, Sergeyev P, Krut O. Fundamentals of highly loaded coal-water slurries. In: Mining of Mineral Deposits. Boca Raton: CRC Press, 2013
|
48 |
Dzuy N Q, Boger D V. Yield stress measurement for concentrated suspensions. Journal of Rheology (New York, N.Y.), 1983, 27(4): 321–349
|
49 |
Herschel W H, Bulkley R. Measurement of rubber-benzole solutions. Colloid & Polymer Science, 1926, 39: 291–300 (in German)
|
50 |
Mishra S K, Senapati P K, Panda D. Rheological behavior of coal-water slurry. Energy Sources, 2002, 24(2): 159–167
|
51 |
Swain P, Panda D. Rheqlogy of coal-water mixtures. Fuel Science & Technology International, 1996,14: 1237–1251
|
52 |
Dorget M. Rheological properties of silica-silicone compounds. Dissertation for the Doctoral Degree. Grenoble, France: Institute National Polytechnique, 1995 (in French)
|
53 |
Pignon F, Piau J, Magnin A. Structure and pertinent length scale of a discotic clay gel. Physical Review Letters, 1996, 76(25): 4857–4860
|
54 |
Pignon F, Magnin A, Piau J,
|
55 |
Piau J M, Dorget M, Palierne J F,
|
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