Selection of Appropriate Model for the Synthesis of Coal Water Slurry (CWS) Using PVA and TEA

Document Type : Research Article


1 Polymer and Petrochemical Engineering Department, NED University of Engineering &Technology, Karachi, PAKISTAN

2 Chemical Engineering Department, Universiti Teknologi PETRONAS (UTP), 32610 Seri Iskandar Perak, MALAYSIA


Coal-Water Slurry (CWS) is an attractive alternative fuel with lower cost and reliable in terms of transportation and handling. The efficiency of CWS gasification depends on the preparation of CWS to ensure the higher carbon contents and low viscosity which will enhance the heating rates along with the atomization of CWS. In this paper, the rheology of CWS was studiedwith coal loading 30 to 60% and the rheological behavior was discussed with the help of Power-law, Casson and Herschel Buckley models which shows that CWS exhibits pseudo-plastic (shear thinning) behavior. The CWS was prepared by using Poly-Vinyl Alcohol (PVA) and Triethanol Amine (TEA) as dispersants and Xanthan gum as a stabilizer. The experimental results showed that for a constant coal loading viscosity decreases as the shear rate increases and out of these rheological models, power-law fits best on the experimental data with the highest R2 of 0.99


Main Subjects

[1] Lee S., “Alternative Fuels”: CRC Press, (1996).
[2] Fan Y., Hu H., Jin L., Zhu S., Zhang Q., Static Stability and Rheological Behavior of Lignite Char–Water Mixture, Fuel, 104: 7-13 (2013).
[3] Dmitrienko M.A., Legros J.C., Strizhak P.A., Experimental Evaluation of Main Emissions During Coal Processing Waste Combustion, Environmental Pollution, 233: 299-305 (2018).
[4] Dmitrienko M.A., Nyashina G.S., Strizhak P.A., Major Gas Emissions from Combustion of Slurry Fuels Based on Coal, Coal Waste, and Coal Derivatives, Journal of Cleaner Production, 177: 284-301 (2018).
[5] Dmitrienko M.A., Nyashina G.S., Strizhak P.A., Environmental Indicators of the Combustion of Prospective Coal Water Slurry Containing Petrochemicals, Journal of Hazardous Materials, 338: 148-159 (2017).
[6] Chakravarthy A., Kumar S., Mohapatra S., Transportation Performance of Highly Concentrated Coal-Water Slurries Prepared from Indian Coalsin Applied Mechanics and Materials, 592: 869-873 (2014).
[7] Mishra S., Senapati P., Panda D., Rheological Behavior of Coal-Water Slurry, Energy Sources, 24: 159-167 (2002).
[8] Boylu F., Dincer H., Ateşok G., Effect of Coal Particle Size Distribution, Volume Fraction and Rank on the Rheology of Coal–Water Slurries, Fuel Processing Technology, 85: 241-250 (2004).
[9] Buranasrisak P., Narasingha M.H., Effects of Particle Size Distribution and Packing, 3, 31 (2012). Characteristics on the Preparation of Highly-Loaded Coal-Water Slurry, International Journal of Chemical Engineering and Applications, 3: 31-35 (2012).
[11] Mosa E.S., Saleh A.-H.M., Taha T.A., El-Molla A.M., Effect of Chemical Additives on Flow Characteristics of Coal Slurries, Physicochemical Problems of Mineral Processing, 42: 107-118 (2008).
[12] Pawlik M., Polymeric Dispersants for Coal–Water Slurries, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 266: 82-90 (2005).
[13] Yi F., Gopan A., Axelbaum R.L., Characterization of Coal Water Slurry Prepared for PRB Coal, 燃料化学学, 42: 1167-1171 (2014).
[14] Singh A.K., Kumar S.G., Rheological Investigation of Coal Water Slurries with and without Additive, MSc Thesis, Thapar University, Patiala, India (2012).
[15] Ongsirimongkol N., Narasingha M., Effects of Stabilizing Agents on Stability and Rheological Characteristics of the Highly-Loaded Coal-Water Slurry, International Journal of Chemical Engineering and Applications, 3: 49-      (2012).
[17] Chhabra R.P., Richardson J.F., “Non-Newtonian Flow: Fundamentals and Engineering Applications”: Elsevier, (1999).
[18] Herschel W.H., Bulkley R., Konsistenzmessungen Von Gummi-Benzollösungen, Colloid & Polymer Science, 39:  291-300 (1926).
[20] Briggs J.L., Steffe J.F., Using Brookfield Data and the Mitschka Method to Evaluate Power-law Foods, Journal of Texture Studies, 28: 517-522 (1997).
[21] Miller S., Morrison J., Scaroni A., "The Formulation and Combustion of Coal Water Slurry Fuels from Impounded Coal Fines," In: 19th International Technical Conference on Coal Utilization & Fuel Systems, pp. 643-650 (1994).
[22] Marchand D.J., Abrams A., Heiser B.R., Kim Y., Kim J., Kim S.H., Rheological Modifiers for Petroleum Coke–Water Slurry, Fuel Processing Technology, 144: 290-298 (2016).
[24] Kozlov M., Quarmyne M., Chen W., McCarthy T.J., Adsorption of Poly (vinyl alcohol) onto Hydrophobic Substrates. A General Approach for Hydrophilizing and Chemically Activating Surfaces," Macromolecules, 36: 6054-6059 (2003).
[25] Savitskii D., The Effect of Water–Glycerol Mixtures on Rheological Properties of Coal Slurries, Colloid Journal, 78: 109-114 (2016).
[26] Tadros T., Interparticle Interactions in Concentrated Suspensions and Their Bulk (Rheological) Properties, Advances in Colloid and Interface Science, 168: 263-277 (2011).
[27] Mukherjee A., Pisupati S.V., Interparticle Interactions in Highly Concentrated Coal–Water Slurries and Their Effect on Slurry Viscosity, Energy & Fuels, 29: 3675-3683 (2015).
[28] Tadros T.F., “Rheology of Dispersions: Principles and Applications”, John Wiley & Sons, (2011).
[29] Xu Z., Chong L., Wang W., Chen Y., Tu Y.n., Zhang R., "Coal Water Mixture Preparation Technology and Application in Replacing Oil to Generate Electricity", In: Power and Energy Engineering Conference, APPEEC 2009. Asia-Pacific, pp. 1-5 (2009).
[30] Usui H., Saeki T., Hayashi K., Tamura T., Sedimentation Stability and Rheology of Coal Water Slurries, Coal Preparation, 18: 201-214 (1997).