Abstract
Thermal properties of pulverized coal govern the heat transfer and greatly influence the coal dust explosion and spontaneous combustion processes. This study measures the thermal properties of five coal samples at six distinct particle sizes using an advanced thermal property analyzer. The thermo-physical properties of coal dust positively correlated with the particle size. Thermal conductivity, diffusivity, and specific heat capacity increased with the ash percentage, bulk density, and specific gravity of coal dust. In contrast, they negatively correlated with the fixed carbon and volatile content of coal. Empirical relations between the thermo-physical properties were developed. The thermal conductivity, diffusivity, and specific heat capacity of coal dusts varied in the range of 0.091–0.147 W/mK, 0.125–0.164 mm2/s, and 0.715–0.945 MJ/m3K, respectively. With increase in particle size from < 38 to 500–1000 µm, thermal conductivity, thermal diffusivity, and specific heat capacity increased in the range of 25.60–32.89%, 9.76–22.11%, and 9.57–20.80%, respectively, for different coal samples.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
Data availability
All relevant data generated during the study are included in the article.
References
Abdulagatova Z, Abdulagatov IM, Emirov VN (2009) Effect of temperature and pressure on the thermal conductivity of sandstone. Int J Rock Mech Min Sci 46:1055–1071. https://doi.org/10.1016/j.ijrmms.2009.04.011
Azam S, Mishra DP (2019) Effects of particle size, dust concentration and dust-dispersion-air pressure on rock dust inertant requirement for coal dust explosion suppression in underground coal mines. Process Saf Environ Prot 126:35–43. https://doi.org/10.1016/j.psep.2019.03.030
Beck MP, Yuan Y, Warrier P, Teja AS (2009) The effect of particle size on the thermal conductivity of alumina nanofluids. J Nanoparticle Res 11:1129–1136. https://doi.org/10.1007/s11051-008-9500-2
Chopkar I, Sudarshan S, Das PK, Manna I (2008) Effect of particle size on thermal conductivity of nanofluid. Metall Mater Trans A Phys Metall Mater Sci 39:1535–1542. https://doi.org/10.1007/s11661-007-9444-7
Chu Z, Zhou G, Wang Y et al (2018) Thermal – physical properties of selected geomaterials : coal, sandstone and concrete based on basic series and parallel models. Environ Earth Sci 77:1–19. https://doi.org/10.1007/s12665-018-7337-2
Cremers CJ (1985) Effective thermal diffusivity of powdered coal. Thermal Conductivity 18:699–707
Deng J, Li Q, Xiao Y et al (2018a) Thermal diffusivity of coal and its predictive model in nitrogen and air atmospheres. Appl Therm Eng 130:1233–1245. https://doi.org/10.1016/j.applthermaleng.2017.11.102
Deng J, Li Q, Xiao Y, Shu C (2017a) Experimental study on the thermal properties of coal during pyrolysis, oxidation, and re-oxidation. Appl Therm Eng 110:1137–1152. https://doi.org/10.1016/j.applthermaleng.2016.09.009
Deng J, Li QW, Xiao Y et al (2017b) Predictive models for thermal diffusivity and specific heat capacity of coals in Huainan mining area, China. Thermochim Acta 656:101–111. https://doi.org/10.1016/j.tca.2017.09.005
Deng J, Ren SJ, Xiao Y et al (2018b) Thermal properties of coals with different metamorphic levels in air atmosphere. Appl Therm Eng 143:542–549. https://doi.org/10.1016/j.applthermaleng.2018.07.117
Disk H (2016) Hot disk thermal constants analyser instruction manual. User Man
Gan J, Zhou Z, Yu A (2017) Effect of particle shape and size on effective thermal conductivity of packed beds. Powder Technol 311:157–166. https://doi.org/10.1016/j.powtec.2017.01.024
Ghosh A, Gupta S, Ghosh A, Neogi S (2016) Preservation of sand and building energy conservation. Energy Procedia 90:432–440. https://doi.org/10.1016/j.egypro.2016.11.210
Gosset D, Guillois O, Papoular R (1996) Thermal diffusivity of compacted coal powders. Carbon N Y 34:369–373. https://doi.org/10.1016/0008-6223(95)00193-X
GUM (2008) Evaluation of measurement data — guide to the expression of uncertainty in measurement. Int Organ Stand Geneva ISBN 50:134
Gustafsson SE (1991) Transient plane source techniques for thermal conductivity and thermal diffusivity measurements of solid materials. Rev Sci Instrum 62:797–804. https://doi.org/10.1063/1.1142087
He Y (2005) Rapid thermal conductivity measurement with a hot disk sensor: Part 1. Theoretical Considerations Thermochim Acta 436:122–129. https://doi.org/10.1016/j.tca.2005.06.026
Herrin JM, Demirig D (1996) Thermal conductivity of U. S. coals Subbituminous Coal Lignite Bituminous Coal. J Geophys Res 101:381–386
Krause M, Blum J, Skorov YV, Trieloff M (2011) Thermal conductivity measurements of porous dust aggregates : I. Technique, model and first results. Icarus 214:286–296. https://doi.org/10.1016/j.icarus.2011.04.024
Li B, Liu G, Bi MS et al (2021) Self-ignition risk classification for coal dust layers of three coal types on a hot surface. Energy 216:119197. https://doi.org/10.1016/j.energy.2020.119197
Maeda K, Tsunetsugu Y, Miyamoto K, Shibusawa T (2021) Thermal properties of wood measured by the hot-disk method: comparison with thermal properties measured by the steady-state method. J Wood Sci 67:1–14. https://doi.org/10.1186/s10086-021-01951-1
Melchior E, Luther H (1982) Measurement of true specific heats of bituminous coals of different rank, and of a high-temperature coke, in the temperature range 30–350 °C. Fuel 61:1071–1079. https://doi.org/10.1016/0016-2361(82)90188-0
Miao SQ, Li HP, Chen G (2014) Temperature dependence of thermal diffusivity, specific heat capacity, and thermal conductivity for several types of rocks. J Therm Anal Calorim 115:1057–1063. https://doi.org/10.1007/s10973-013-3427-2
Mishra DP (2022) Physico-chemical characteristics of pulverized coals and their interrelations—a spontaneous combustion and explosion perspective. Environ Sci Pollut Res 29:24849–24862. https://doi.org/10.1007/s11356-021-17626-9
Mishra DP, Azam S (2018) Experimental investigation on effects of particle size, dust concentration and dust-dispersion-air pressure on minimum ignition temperature and combustion process of coal dust clouds in a G-G furnace. Fuel 227:424–433. https://doi.org/10.1016/j.fuel.2018.04.122
Park H, Rangwala AS, Dembsey NA (2009) A means to estimate thermal and kinetic parameters of coal dust layer from hot surface ignition tests. J Hazard Mater 168:145–155. https://doi.org/10.1016/j.jhazmat.2009.02.010
Rahman MH, Islam MT, Minhaj TI, et al (2015) Study of thermal conductivity and mechanical property of insulating firebrick produced by local clay and petroleum coal dust as raw materials. In: Procedia Engineering. Elsevier B.V., pp 121–128
Ramlu MA (1991) Mine disasters and mine rescure, Second Edi. University Press (India), Hyderabad
Ramya M, Nideep TK, Nampoori VPN, Kailasnath M (2019) Particle size and concentration effect on thermal diffusivity of water-based ZnO nanofluid using the dual-beam thermal lens technique. Appl Phys B Lasers Opt 125:1–9. https://doi.org/10.1007/s00340-019-7294-9
Reddy PD, Amyotte PR, Pegg MJ (1998) Effect of inerts on layer ignition temperatures of coal dust. Combust Flame 114:41–53. https://doi.org/10.1016/S0010-2180(97)00286-1
Rifella A, Setyawan D, Chun DH, et al (2019) The effects of coal particle size on spontaneous combustion characteristics. Int J Coal Prep Util 0:1–25https://doi.org/10.1080/19392699.2019.1622529
Sahu A, Mishra DP (2022a) Coal dust monitoring and computational simulations of dust dispersion in continuous miner development heading through auxiliary ventilation systems. Curr Sci 122:419–428. https://doi.org/10.18520/cs/v122/i4/419-428
Sahu A, Mishra DP (2022b) Investigation of lag on ignition of coal dust clouds under varied experimental conditions. Adv Powder Technol 33:103804. https://doi.org/10.1016/j.apt.2022.103804
Sakatani N, Ogawa K, Iijima Y, et al (2017) Thermal conductivity model for powdered materials under vacuum based on experimental studies. AIP Adv 7https://doi.org/10.1063/1.4975153
Schön SJ (2011) Thermal Properties
Shi Q, Qin Y, Chen Y (2020) Relationship between thermal conductivity and chemical structures of Chinese coals. ACS Omega 5:18424–18431. https://doi.org/10.1021/acsomega.0c02281
Stanger R, Xie W, Wall T et al (2013) Dynamic measurement of coal thermal properties and elemental composition of volatile matter during coal pyrolysis. Integr Med Res 3:2–8. https://doi.org/10.1016/j.jmrt.2013.10.012
Tanikawa W, Tadai O, Morita S, Lin W (2016) Thermal properties and thermal structure in the deep-water coalbed basin off the Shimokita Peninsula, Japan. Mar Pet Geol 73:445–461. https://doi.org/10.1016/j.marpetgeo.2016.03.006
Warrier P, Teja A (2011) Effect of particle size on the thermal conductivity of nanofluids containing metallic nanoparticles. Nanoscale Res Lett 6:1–6
Wen H, Lu JH, Xiao Y, Deng J (2015) Temperature dependence of thermal conductivity, diffusion and specific heat capacity for coal and rocks from coalfield. Thermochim Acta 619:41–47
Zhumagulov MG (2013) Experimental study of thermophysical properties of Shubarkol coal. Chem Technol Fuels Oils 49:100–107
Acknowledgements
The authors express their sincere thanks to the mine management of different subsidiaries of Coal India Limited (CIL) for helping in coal sample collection from underground mines for this study.
Author information
Authors and Affiliations
Contributions
Aashish Sahu: investigation, methodology, experimentation, data curation, formal analysis, writing–original draft.
Devi Prasad Mishra: conceptualization, visualization, methodology, supervision, writing–review and editing.
Corresponding author
Ethics declarations
Ethical approval
Not applicable.
Consent to participate
Not applicable.
Consent for publication
Not applicable.
Conflict of interest
The authors declare no competing interests.
Additional information
Responsible Editor: Shimin Liu
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
About this article
Cite this article
Sahu, A., Mishra, D.P. Effects of intrinsic properties, particle size, bulk density, and specific gravity on thermal properties of coal dusts. Environ Sci Pollut Res 30, 41236–41252 (2023). https://doi.org/10.1007/s11356-022-25035-9
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11356-022-25035-9