Fluidization characteristics and charging behavior of fly ash in a vibro-fluidized bed

Zhang, Lifeng; Hou, Jiangtian; Bi, Xiaotao; Grace, John R.; Janke, Travis; Arato, Claudio

doi:10.1016/j.powtec.2011.10.005

Cited by 32 publications

(11 citation statements)

References 22 publications

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“…The maximum weight fraction could be up to 80%. This was consistent with the conclusions made in previous research, where effective fluidization was difficult to achieve when the sawdust volume fraction exceeded 80% in co-fluidization experiments with sand and sawdust (Zhang et al 2012). Moreover, Guo et al (2001) pointed out that in a non-equal density system composed of biomass and inert particles, when the weight fraction of the floating component is more than 50%, a good fluidization state cannot be formed.…”

Section: Fluidization Of Biomass/sand-3 Mixturessupporting

confidence: 90%

“…Zhang et al (2012) studied the fluidic properties of fly ash in a mechanically vibrating fluidized bed and found that the vibrations could reduce the minimum fluidization velocity (Umf) by providing an additional power to the fluidization of material. Further studies of the effect of vibration on the fluidization behavior showed similar conclusions, in that both amplitude and frequency have crucial impacts on the fluidization of fine powder materials (Marring et al 1994;Barletta et al 2008).…”

Section: Introductionmentioning

confidence: 99%

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Fluidization Behavior of Biomass Particles and its Improvement in a Cold Visualized Fluidized Bed

Wu¹,

Li²,

Song³

et al. 2017

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The fluidization behavior in a fluidized bed was visualized at room temperature under different conditions for two typical lignocellulosic biomass materials (rice husk and walnut shell) as representative samples of herbage and xylophyta, respectively. The effects of initial bed height, moisture content, and addition of sand particles on the quality of fluidization were analyzed, and the optimal operating parameters were determined. The initial bed height had a negligible effect on the minimum fluidization velocity but an obvious influence on bed stability. In addition, with an increase in moisture content, the minimum fluidization velocity showed the growth of an S-shaped curve and a constant decrease in the fluidization index in the fluidized region. Fluidization when performed on binary mixtures indicated that the proportion of sand-3 (60 to 80 mesh) in biomass and sand-3 in mixtures is a main factor contributing to the fluidizing quality of a bed. With larger proportions of sand-3, the fluidizing quality of the bed improved. Meanwhile, the differences in fluidization behavior between rice husk and walnut shell have been determined.

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Section: Fluidization Of Biomass/sand-3 Mixturessupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Fluidization Behavior of Biomass Particles and its Improvement in a Cold Visualized Fluidized Bed

Wu¹,

Li²,

Song³

et al. 2017

BioResources

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“…Chandler et al, 1997;Izquierdo et al, 2002). With regard to the evaluation of the organic carbon content of coal fly ash (FA) to be reused in cement production, LOI has been referred to the mass losses of samples heated to temperatures between 750 and 950°C (Payá et al, 1998;Fan and Brown, 2001;Zhang et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Mechanisms contributing to the thermal analysis of waste incineration bottom ash and quantification of different carbon species

et al. 2013

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a b s t r a c tThe focus of this study was to identify the main compounds affecting the weight changes of bottom ash (BA) in conventional loss on ignition (LOI) tests and to obtain a better understanding of the individual processes in heterogeneous (waste) materials such as BA. Evaluations were performed on BA samples from a refuse derived fuel incineration (RDF-I) plant and a hospital waste incineration (HW-I) plant using thermogravimetric analysis and subsequent mass spectrometry (TG-MS) analysis of the gaseous thermal decomposition products. Results of TG-MS analysis on RDF-I BA indicated that the LOI measured at 550°C was due to moisture evaporation and dehydration of Ca(OH) 2 and hydrocalumite. Results for the HW-I BA showed that LOI at 550°C was predominantly related to the elemental carbon (EC) content of the sample. Decomposition of CaCO 3 around 700°C was identified in both materials. In addition, we have identified reaction mechanisms that underestimate the EC and overestimate the CaCO 3 contents of the HW-I BA during TG-MS analyses. These types of artefacts are expected to occur also when conventional LOI methods are adopted, in particular for materials that contain CaO/Ca(OH) 2 in combination with EC and/or organic carbon, such as e.g. municipal solid waste incineration (MSWI) bottom and fly ashes. We suggest that the same mechanisms that we have found (i.e. in situ carbonation) can also occur during combustion of the waste in the incinerator (between 450 and 650°C) demonstrating that the presence of carbonate in bottom ash is not necessarily indicative for weathering. These results may also give direction to further optimization of waste incineration technologies with regard to stimulating in situ carbonation during incineration and subsequent potential improvement of the leaching behavior of bottom ash.

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“…Mechanical vibrations are being used to ease fluidization in materials that present poor fluidization quality. Zhang et al (Zhang et al, 2012) studied the fluidization characteristics of fly ash in a fluidized bed subjected to mechanical vibrations. They found that the minimum fluidization velocity decreased due to the vibrations, implying that fly ash can be fluidized at a lower superficial gas velocity.…”

Section: Mechanical Vibrationsmentioning

confidence: 99%

“…Studies in the literature have used mechanical vibrations to improve the fluidization quality of material that shows poor fluidization behavior (Marring et al, 1994, Zhang et al, 2012. For example, Barletta et al (Barletta et al, 2008) studied the effects of mechanical vibration on fine powders.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the hydrodynamic structure of a 3D acoustic fluidized bed

Guevara¹,

Roder²

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Fluidization characteristics and charging behavior of fly ash in a vibro-fluidized bed

Cited by 32 publications

References 22 publications

Fluidization Behavior of Biomass Particles and its Improvement in a Cold Visualized Fluidized Bed

Fluidization Behavior of Biomass Particles and its Improvement in a Cold Visualized Fluidized Bed

Mechanisms contributing to the thermal analysis of waste incineration bottom ash and quantification of different carbon species

Characterization of the hydrodynamic structure of a 3D acoustic fluidized bed

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