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https://hdl.handle.net/2440/124348
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dc.contributor.author | Zhou, S. | - |
dc.contributor.author | Hosseini, T. | - |
dc.contributor.author | Zhao, J. | - |
dc.contributor.author | Zhang, X. | - |
dc.contributor.author | Wu, H. | - |
dc.contributor.author | Zhang, L. | - |
dc.date.issued | 2019 | - |
dc.identifier.citation | Energy and Fuels, 2019; 33(3):2142-2152 | - |
dc.identifier.issn | 0887-0624 | - |
dc.identifier.issn | 1520-5029 | - |
dc.identifier.uri | http://hdl.handle.net/2440/124348 | - |
dc.description.abstract | Prior washing of coal is an essential step for the minimization of ash-related slagging and fouling inside a coal-fired boiler. With regard to the coal washing process, the recyclability of the washing reagent, usually water, is critical from both cost-effective and efficiency perspectives. This paper addresses the washing kinetics of water-soluble Na⁺ from two different low-rank Xinjiang coals using both fresh and used/recycled water to alleviate the ash-related fouling in low-rank coal-fired boilers. Apart from once-through fresh water washing, washing using recycled water via both multicycle single-stage and three-stage countercurrent processes was studied in detail to investigate the recyclability of water. Additionally, a modified shrinking core model (SCM) was developed to reveal the Na⁺ removal mechanism under all washing conditions. Our experimental results showed that the Na⁺ removal extent decreased with the recycling of used water due to an increase in the Na⁺ concentration in the recycled water and/or a decrease in the Na⁺ content in the washed coal. The saturation point of Na⁺ in the used water, beyond which the water can no longer remove Na⁺, is far below the solubility of NaCl in water. The modeling approach further confirmed that the overall rate for the removal of water-soluble Na⁺ is dominated by the intraparticle diffusion within the coal matrix. The effective diffusion coefficient of Na⁺ was within the range of 0.28 × 10⁻⁶ to 3.75 × 10⁻⁶ cm²/s, which agrees with reported values in the literature. Additionally, a novel iterative calculation method integrating the modified SCM into the three-stage countercurrent washing process has been proposed to predict the Na⁺ removal at each stage for each cycle. The results show that the water can be recycled a maximum of 15 times in the three-stage countercurrent process. | - |
dc.description.statementofresponsibility | Song Zhou, Tahereh Hosseini, Jie Zhao, Xiwang Zhang, Hongwei Wu, and Lian Zhang | - |
dc.language.iso | en | - |
dc.publisher | American Chemical Society; ACS Publications | - |
dc.rights | © 2019 American Chemical Society | - |
dc.source.uri | http://dx.doi.org/10.1021/acs.energyfuels.9b00055 | - |
dc.title | Selective removal of sodium from low-rank Xinjiang coal upon multistage countercurrent water washing: experimental investigation and kinetics modeling | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1021/acs.energyfuels.9b00055 | - |
dc.relation.grant | http://purl.org/au-research/grants/arc/IH150100006 | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Hosseini, T. [0000-0001-9197-4131] | - |
Appears in Collections: | Aurora harvest 4 Chemical Engineering publications |
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