Agglomeration in fluidized beds at high temperatures: Mechanisms, detection and prevention

Bartels, Malte; Lin, Weigang; Nijenhuis, John; Kapteijn, Freek; Ommen, J. Ruud van

doi:10.1016/j.pecs.2008.04.002

Cited by 342 publications

(235 citation statements)

References 116 publications

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“…[13][14][15][16] Of these parameters, the particle size distribution (PSD) was an important factor that affected the fluidization behavior of bed materials. Ray 17) and Pell 18) had reported that the PSD influenced the hydrodynamic behavior of fluidized beds, including particle mixing, the minimum fluidization velocity, the terminal velocity, and the elutriation rate.…”

Section: Influence Of Particle Size Distribution On Agglomeration/ Dementioning

confidence: 99%

Influence of Particle Size Distribution on Agglomeration/defluidization of Iron Powders at Elevated Temperature

et al. 2017

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Section: Influence Of Particle Size Distribution On Agglomeration/ Dementioning

confidence: 99%

Influence of Particle Size Distribution on Agglomeration/defluidization of Iron Powders at Elevated Temperature

et al. 2017

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“…The temperature in this fluidized-bed zone is below the ash sintering point (T sinter ), thus no formation of agglomerates is possible there. For some ashes the sinter temperature can be several hundred Kelvin below the initial deformation temperature [11,17,18]. Because the targeted particles are coal fines, usually < 500 μm, a lower fluidization velocity is required in comparison to conventional fluidized beds.…”

Section: Flow Pattern Of Inci Gasification Principlementioning

confidence: 99%

Comparison of Two Coal-Gasifier-Designs with Moving-Bed and Internal-Circulating-Fluidized-Bed Configuration in One Reactor

Schurz¹,

Laugwitz²,

Krzack³

et al. 2017

TOEFJ

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Background:Coal gasification is the promising technology for syngas routes to produce chemicals or transportation fuels. Additionally, it enables clean power generation from coal in Integrated Gasification Combined Cycles (IGCC). So far, coal fines with high ash contents could not be feasibly used in such routes.In this regard, the Internal Circulation gasifier (INCI) is designed to gasify high-ash coal fines efficiently. The staged system is combining a moving bed, a fluidized bed and a jetting fluidized bed in one reaction chamber. Method:The present paper substantially describes the laboratory-scale prototype development in the COORVED-project ("CO2-reduction by innovative gasifier design") based on the INCI gasification principle of about 50-125 kW thermal input. Information about the gasifiers compounding, especially the reaction chamber, peripheral components and applied measurement systems are given. Results:Experimental results are presented, confirming the targeted, typical flow pattern inside the reaction chamber. Furthermore technical and operational limits of the COORVED prefiguration are discussed. Based on these results a major design change of the reaction chamber is required and explained in detail. Additionally, results of the feedstock variation from coke to lignite are shown. Conclusion:Finally, the operability of the INCI gasification principle is proven by a stationary operating system with controlled ash agglomeration.

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“…ZIEGLO have studied the heat transfer performance of liquid-solid two-phase flow and three-phase fluidized bed, assuming the liquid content is constant in the three-phase flow and two-phase flow systems by setting the example of glass particle and column Y-particle. Then the three-phase flow and two-phase flow heat transfer coefficient should be expressed by thermal resistance of fluidized bed [20][21][22][23][24]. The result is that the three-phase fluidized bed heat transfer coefficient and the corresponding liquid-solid two-phase fluidized bed heat transfer coefficient can be obtained by the following correlation formula: …”

Section: Three-phase Flow Heat Transfer Modelmentioning

confidence: 99%

Experimental Study on Hydrodynamic Performance and Heat Transfer Mechanism of Vapor-liquid-solid Three-Phase Fluidized Bed

Guo¹,

Qi²,

Zheng³

et al. 2016

IJHT

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In consideration of the characteristics of vapor-liquid-solid three-phase fluidized bed, this evaporator is applied in the liquid food-green tea extraction liquid concentration/evaporation process in this paper. The inert particles fluidized bed evaporation experiment device is designed and built combined with the characteristics of food material concentration. In this experiment, the heat transfer mechanism and hydrodynamic performance of inert particles fluidized bed evaporator during extraction of concentrated green tea are studied, and the impact of various experimental operation parameters on the evaporation and heat transfer performance as well as pressure dropping is analyzed. Moreover, the dimensionless analysis method is used to establish a correlation formula between the heat transfer coefficient and pressure drop dimensionless number of inert particle fluidized bed evaporator according to the characteristics of inert particles fluidized bed. In addition, the fouling prevention and descaling property and hydrodynamic performance of inert particle fluidized bed evaporator are studied, providing practical significance for industrial production.

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Agglomeration in fluidized beds at high temperatures: Mechanisms, detection and prevention

Cited by 342 publications

References 116 publications

Influence of Particle Size Distribution on Agglomeration/defluidization of Iron Powders at Elevated Temperature

Influence of Particle Size Distribution on Agglomeration/defluidization of Iron Powders at Elevated Temperature

Comparison of Two Coal-Gasifier-Designs with Moving-Bed and Internal-Circulating-Fluidized-Bed Configuration in One Reactor

Experimental Study on Hydrodynamic Performance and Heat Transfer Mechanism of Vapor-liquid-solid Three-Phase Fluidized Bed

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