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Energies 2015, 8(6), 4735-4754; doi:10.3390/en8064735

Influence of Coal Blending on Ash Fusibility in Reducing Atmosphere

1
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
2
Laboratory for Thermal Hydraulic and Safety, China Nuclear Power Technology Research Institute, Shenzhen 528026, China
*
Author to whom correspondence should be addressed.
Academic Editor: Mehrdad Massoudi
Received: 16 April 2015 / Revised: 11 May 2015 / Accepted: 14 May 2015 / Published: 26 May 2015
(This article belongs to the Special Issue Recent Advances in Coal Combustion and Gasification)
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Abstract

Coal blending is an effective way to organize and control coal ash fusibility to meet different requirements of Coal-fired power plants. This study investigates three different eutectic processes and explains the mechanism of how coal blending affects ash fusibility. The blended ashes were prepared by hand-mixing two raw coal ashes at five blending ratios, G:D = 10:90 (G10D90), G:D= 20:80 (G20D80), G:D = 30:70 (G30D70), G:D = 40:60 (G40D60), and G:D = 50:50 (G50D50). The samples were heated at 900 °C, 1000 °C, 1100 °C, 1200 °C, and 1300 °C in reducing atmosphere. XRD and SEM/EDX were used to identify mineral transformations and eutectic processes. The eutectic processes were finally simulated with FactSage. Results show that the fusion temperatures of the blended ashes initially decrease and then increase with the blending ratio, a trend that is typical of eutectic melting. Eutectic phenomena are observed in D100, G10D90, and G30D70 in different degrees, which do not appear in G100 and G50D50 for the lack of eutectic reactants. The main eutectic reactants are gehlenite, magnetite, merwinite, and diopside. The FactSage simulation results show that the content discrepancy of merwinite and diopside in the ashes causes the inconsistent eutectic temperatures and eutectic degrees, in turn decrease the fusion temperature of the blended ash and then increase them with the blending ratio. View Full-Text
Keywords: coal blending; ash fusibility; mineral transformations; eutectic coal blending; ash fusibility; mineral transformations; eutectic
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Shen, M.; Qiu, K.; Zhang, L.; Huang, Z.; Wang, Z.; Liu, J. Influence of Coal Blending on Ash Fusibility in Reducing Atmosphere. Energies 2015, 8, 4735-4754.

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