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| 1 | Elutriation, attrition and segregation in a conical spouted bed with a fountain confiner显示文摘This study examined elutriation,attrition,and segregation in a conical spouted bed with a fountain confiner and incorporating an open sided draft tube.Fine silica sand with a wide particle size distribution was employed as a model material,operating in both the batch and continuous modes.The use of a fountain confiner is crucial when operating with fine particles,because otherwise the bed rapidly exhibits significant entrainment.The extent of attrition was quantified using a tracing technique based on differently-coloured sand fractions as well as monitoring size distributions by sieving.Particle breakage was found to be the primary attrition mechanism,and the fountain confiner was determined to limit the elutriation of fine particles resulting from breakage.Consequently,only a small fraction of the finest particles were entrained from the bed.The incorporation of a confiner increased operational stability while reducing segregation,especially in the upper half of the bed where the majority of segregation typically occurs.Thus,the bed was perfectly mixed apart from very minimal segregation close to the wall and at the bottom of the contactor.These results provide a basis for the design and operation of larger scale equipment for the continuous drying of materials. | Aitor Pablos Roberto Aguado Jorge Vicente Mikel Tellabide Javier Bilbao Martin Olazar | 2020 | Particuology2020，18，4： | 2 |
| 2 | Elutriation characteristics of multi-component mixtures in a fluidized bed pyrolysis process显示文摘Multi-component mixtures were prepared to simulate a bed of walnut shells undergoing pyrolysis in acold fluidized bed.Four mixtures with different ratios of walnut shell,semi-chars,and clean char were used.Batch elutriation experiments using these mixtures were performed in a transparent fluidized bed to allow direct observation of the flow patterns and particle composition.The results indicated that the bubble wake rather than bubble nose was primarily responsible for particle entrainment at higher gas velocities,and that coarser particles would be“transformed”into elutriable particles.Dimensionless gas velocities ranged from 0.2 to 1.0 and an exponential decrease in particle concentration with respect to bed height was observed.The transport disengagement height(TDH)gradually increased with the gas velocity until the entire bed layer enters a pneumatic transport state.Notably,larger TDHs were required when the bed contained a larger fraction of light components.Two characteristic parameters were used to evaluate particle elutriation:the elutriation rate constant(K),and the residual volatile content of the elutriated particles(v′).These parameters were used to optimize operating gas velocity for the fluidized bed. | Xing Wu Jingbo Peng Yu Zhang Zhiduo Wang | 2021 | Particuology2021，19，5： | 2 |
| 3 | EXPERIMENTAL STUDY OF GAS—SOLID SUSPENSION FLOWS IN VORTEXING FLUIDIZED BED CHAMBER FREEBOARD显示文摘Gas flows and particle mass flux were measured and clutriation experimentswere conducted in two cold test models of vortexing fluidized bed(VFB).The experimen-tal results show that the secondary air injected tangentially creates strong vortexes,estab-lishes particle suspension layers and internal circulation,and suppresses the elutriation offine particles greatly.The vortexing fluidized bed combustion has bright prospect bccauseof its much higher combustion efficiency and desulphidation efficiency than bubblingfluidized bed combustion due to long particle residence time and high slip velocity betweengas and solid,and its simpler configuration and lower cost than circulating fluidized bedcombustion. | 赵长遂 朱皑强 G.Yang S.Nieh | 1991 | Journal of Southeast University(English Edition)1991，7，1： | 0 |
| 4 | Recovery of valuable metals from waste cables by employing mechanical processing followed by spouted bed elutriation显示文摘Cables and wires, which are essential parts of equipment for the transmission of both information and electricity, contain valuable materials including copper (Cu) and aluminum (Al). This experimental work evaluates the use of mechanical processing (grinding and sieving), followed by spouted bed elutriation, for separation of the valuable materials (steel-coated copper, copper, and aluminum) present in waste coaxial and internet cables. A recovery efficiency of approximately 90% was achieved for the steel-coated copper in coaxial cables. For in ternet cables, the copper recovery efficiency was approximately 87%. These findings dem on strate that it is possible to separate, recover, and recycle the valuable materials (metals) present in waste cables using simple, low-cost, and efficient mechanical processing followed by spouted bed elutriation. | Eduardo H. Tanabe Roger M. Silva Daliomar L. Oliveira Junior Daniel A. Bertuol | 2019 | Particuology2019，17，4： | 0 |
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