Abstract
The effect of the ashing temperature on the physicochemical properties of ashes from Zhundong lignite was investigated. The ash samples were prepared in a muffle furnace in air at ashing temperatures ranging from 550 to 1200 °C and were then subjected to a series of analysis including the yield and chemical compositions of the ash, ash mineralogy and morphology, and ash sintering temperature. It was found that these physicochemical properties of the ash varied significantly with the ashing temperature. Firstly, the ash yield was significantly decreased with increasing the ashing temperature. Secondly, the ash chemical compositions were found to be rich in Ca, S, Mg, Na and K at 550 °C, and the fates of these contents varied significantly with increasing the ashing temperature. Furthermore, XRD results showed that Ca-bearing and Na-bearing minerals such as anhydrite, calcite, halite and sodium calcium silicate were identified at 550 °C. As the ashing temperature increased, complex mineral reactions including the vaporisation of halite, the decomposition of calcite and anhydrite, and the formation of yeelimite and calcite silicate occurred. SEM observations showed that the ash particles collected at 550 °C were fine discrete powdery particles. However, sintered particles with progressively developed strengths and increasing sizes were observed with increasing the ashing temperature, and fused large particles were observed at 1200 °C. In addition, the sintering temperature of the ash increased significantly with increasing the ashing temperature due to the formation of the refractory minerals and the decrease in the contents of Na, Cl, K and S, etc. Moreover, the sintering temperature of the ash was lower than the corresponding ashing temperature other than that at 550 °C, which explained the difference in ash morphology at different ashing temperatures.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Yuan Y, Li S, Yao Q (2015) Dynamic behavior of sodium release from pulverized coal combustion by phase-selective laser-induced breakdown spectroscopy. Proc Combust Inst 35(2):2339–2346
Zhou J, Zhuang X, Alastuey A, Querol X, Li J (2010) Geochemistry and mineralogy of coal in the recently explored Zhundong large coal field in the Junggar basin, Xinjiang province. China Int J Coal Geol 82(1–2):51–67
Xu J, Yu D, Fan B, Zeng X, Lv W, Chen J (2013) Characterization of ash particles from co-combustion with a Zhundong coal for understanding ash deposition behavior. Energy Fuels 28(1):678–684
Li G, Li S, Huang Q, Yao Q (2015) Fine particulate formation and ash deposition during pulverized coal combustion of high-sodium lignite in a down-fired furnace. Fuel 143:430–437
Zhou H, Zhou B, Zhang H, Li L (2014) Behavior of fouling deposits formed on a probe with different surface temperatures. Energy Fuels 28(12):7701–7711
Si J, Liu X, Xu M, Sheng L, Zhou Z, Wang C et al (2014) Effect of kaolin additive on PM2.5 reduction during pulverized coal combustion: importance of sodium and its occurrence in coal. Appl Energy 114:434–444
Zhou H, Zhou B, Zhang H, Li L, Cen K (2014) Investigation of slagging characteristics in a 300 kW test furnace: effect of deposition surface temperature. Ind Eng Chem Res 53(17):7233–7246
Al-Otoom AY, Elliott LK, Wall TF, Moghtaderi B (2000) Measurement of the sintering kinetics of coal ash. Energy Fuels 14(5):994–1001
Bryers RW (1996) Fireside slagging, fouling, and high-temperature corrosion of heat-transfer surface due to impurities in steam-raising fuels. Prog Energy Combust Sci 22(1):29–120
Zhang D (2013) Ultra-supercritical coal power plants: materials, technologies and optimisation. Woodhead Publishing Limited, Cambridge
Raask E (1985) Mineral impurities in coal combustion: behavior, problems, and remedial measures. Hemisphere Publishing Corporation
Luan C, You C, Zhang D (2014) Composition and sintering characteristics of ashes from co-firing of coal and biomass in a laboratory-scale drop tube furnace. Energy 69:562–570
Jing N, Wang Q, Cheng L, Luo Z, Cen K, Zhang D (2013) Effect of temperature and pressure on the mineralogical and fusion characteristics of Jincheng coal ash in simulated combustion and gasification environments. Fuel 104:647–655
Qiu J-R, Li F, Zheng C-G (1999) Mineral transformation during combustion of coal blends. Int J Energy Res 23(5):453–463
Xiao R, Chen X, Wang F, Yu G (2011) The physicochemical properties of different biomass ashes at different ashing temperature. Renew Energy 36(1):244–249
Vuthaluru HB, Wall TF (1998) Ash formation and deposition from a Victorian brown coal—modelling and prevention. Fuel Process Technol 53(3):215–233
Li X, Wu H, Hayashi J-i, Li C-Z (2004) Volatilisation and catalytic effects of alkali and alkaline earth metallic species during the pyrolysis and gasification of Victorian brown coal. Part VI. Further investigation into the effects of volatile-char interactions. Fuel 83(10):1273–1279
Acknowledgments
Jianbo Li would like to acknowledge the scholarships received from China scholarship council (CSC) and the University of Western Australia.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2016 Springer Science+Business Media Singapore and Tsinghua University Press
About this paper
Cite this paper
Li, J., Zhu, M., Zhang, Z., Zhang, D. (2016). Effect of Ashing Temperature on the Physicochemical Properties of Zhundong Lignite Ashes Prepared in a Muffle Furnace. In: Yue, G., Li, S. (eds) Clean Coal Technology and Sustainable Development. ISCC 2015. Springer, Singapore. https://doi.org/10.1007/978-981-10-2023-0_18
Download citation
DOI: https://doi.org/10.1007/978-981-10-2023-0_18
Published:
Publisher Name: Springer, Singapore
Print ISBN: 978-981-10-2022-3
Online ISBN: 978-981-10-2023-0
eBook Packages: EnergyEnergy (R0)