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Improved CFD modeling of full dissolution of alumina particles in aluminum electrolysis cells considering agglomerate formation

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Transactions of Nonferrous Metals Society of China 2021年第11期31卷 3579-3590页

作者： Shui-qing ZHAN Ming-mei JIANG Jun-feng WANG Jian-hong YANG School of Energy and Power Engineering Jiangsu UniversityZhenjiang 212013China School of Material Science and Engineering Jiangsu UniversityZhenjiang 212013China

The full alumina dissolution process in aluminum electrolysis cells was investigated using an improved computational fluid dynamics(CFD)model based on the previous researches by consideration of agglomerate *** results show that the total mass of alumina agglomerate and its maximum size are mainly dependent on the feeding amount and increase with increasing *** superheat can effectively inhibit the agglomerate formation and thus promote the full alumina dissolution *** full alumina dissolution process mainly includes a fast stage and a slow stage,with an average dissolution rate of 17.24 kg/min and 1.53 kg/min,*** 50%(mass percentage)of the total alumina particles,almost all of which are the well-dispersed alumina fine grains,dissolve within the fast dissolution stage of about 10 *** maximum values of the average dissolution rate and final percentage of the cumulative dissolved alumina mass are obtained with a feeding amount of 1.8 kg for a superheat of 12℃.The formation of the alumina agglomerates and slow dissolution characteristics play a dominant role in the full dissolution of alumina particles.

关键词： aluminum electrolysis alumina dissolution agglomerate formation theoretical modeling CFD modeling

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Effect of successive sprays on liquid distribution in fluidized beds

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Particuology 2021年第1期19卷 17-24页

作者： Cedric Briens Liliana Pardo Reyes Franco Berruti Jennifer McMillan Institute for Chemicals and Fuels from Alternative Resources Western University22312 Wonderland Rd.IldertonONN0M 2A0Canada Edmonton Research Centre Syncrude Canada Ltd942117th AveEdmontonABT6N 1H4 Canada

In processes such as Fluid Coking^(™),agglomerate formation should be minimized since it reduces the yield of valuable products,and degrades operability because of the fouling of *** experimental model,consisting of an aqueous solution of gum arabic with a dye,has been successfully developed to simulate the formation of agglomerates in the Fluid Coking^(™)process,where bitumen is sprayed into a fluidized bed of coke particles The particles wetted by a spray could be predicted by assuming that all the particles in the wake of bubbles formed from the tip of the spray jet have been wetted by the injected *** transfer of liquid from particles wetted with the spray to dry bed particles was relatively ineffective,as the number of wet particles increased by only 50%.With successive liquid injections,the proportion of the liquid trapped in agglomerates increases in latter injections:large agglomerates from earlier injections accumulate above the grid and are carried by gas bubbles into the spray jet cavity,where they seed fresh agglomerates.

关键词： Fluidized bed Liquid injection agglomerate formation Fluid Coker

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