Characterization on hydrodynamic behavior in liquid‐containing gas‐solid fluidized bed reactor

Zhou, Yefeng; Ren, Congjing; Wang, Jingdai; Yang, Yongrong

doi:10.1002/aic.13883

Cited by 39 publications

(25 citation statements)

References 39 publications

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“…Having a wide range of tabulated ΔMIT values would help, but unless these can be measured online this method is probably also limited given the complexity of what actually determines its value. Producers therefore sought other methods, and since the early 2000s, the use of acoustic spectroscopy has been discussed as a means of adding predictive capacity to the monitoring of agglomeration and flow in FBRs for the production of PE (alone, and in combination with static probes).…”

Section: Fundamentals Of Condensed Mode Cooling In Modern Pe Plantsmentioning

confidence: 99%

Condensed Mode Cooling of Ethylene Polymerization in Fluidized Bed Reactors

McKenna

2018

Macro Reaction Engineering

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This review gives an overview of the evolution of the technology of condensed mode cooling, primarily for the case of ethylene polymerization on supported catalysts in fluidized bed reactors. It is well known that this mode of heat removal is quite effective in allowing polyolefin manufacturers to increase significantly production rates. What is perhaps less well understood are all of the issues that, in addition to the effect of the latent heat of vaporization of injected liquid components, also have an impact on the rate of production and behavior of the reactor. However, the liquid components injected into the reactor can vaporize rapidly under full‐scale conditions, leaving behind several heavy components (with respect to ethylene) that have numerous effects on how the particles behave, on the reaction rate, and on fluidization, fouling, and other parameters related to reactor and process performance.

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Section: Fundamentals Of Condensed Mode Cooling In Modern Pe Plantsmentioning

confidence: 99%

Condensed Mode Cooling of Ethylene Polymerization in Fluidized Bed Reactors

McKenna

2018

Macro Reaction Engineering

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“…The presence of liquid makes the particles coated with liquid layers or agglomerated by liquid bridges, which results in the particulate flow behaviors greatly different from that of dry system (Seville andClift, 1984, Mitarai andNori, 2006;Zhu et al, 2013;Zhou et al, 2013;Zhou et al, 2016). Particle-particle and particlewall impacts play key roles in such flows.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Model for Normal Impact between Dry Sphere and Liquid Layer with Considerable Thickness

Liu

Chen

2016

Aerosol Air Qual. Res.

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Detailed understanding on the impact mechanism with presence of liquid is helpful for elucidating complex behaviors of wet particle flows. This paper has extended elastohydrodynamic theory by coupling the physical force models for the wet normal impact with a liquid layer of considerable thickness. The contact is divided into penetration, contact, and rebound stages. Three critical Stokes numbers are developed for each stage to predict the sphere rebound behavior. The dependence of the critical Stokes numbers on the layer thickness, sphere radius and the liquid viscosity is also studied. When the layer thickness and liquid viscosity ranges within a low level, most of the kinetic energy is dissipated in the contact stage. With further increase of these two parameters, the energy dissipation in the penetration stage becomes predominant. Finally, we developed an equation to predict the restitution coefficient of the wet normal impact with acceptable accuracy.

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“…The intensity of particle motions is an important parameter to characterize the conveying characteristics, and the acoustic energy is directly related to it . Therefore, the variation trend of acoustic energies at different circumferential positions with superficial gas velocity during flow regime transition was analyzed and results are shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

Flow regime identification in horizontal pneumatic conveying by nonintrusive acoustic emission detection

et al. 2019

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This work investigated flow regimes identification in horizontal pneumatic conveying from the scope of particle motions based on acoustic emission detection. Results showed that the variation of acoustic energy and acoustic energy fraction could be used to identify the transition between suspension flow and stratified flow. Near the transition point, the acoustic energy was maximum, and the energy fraction of particle‐wall collision mutated at high mass fluxes. Furthermore, the fluctuation distribution index (FI) was constructed learning from the concept of polymer molecular weight distribution index, and the “circumferential fluctuation difference (D)” was defined. Based on this, new identification criteria and flow regime diagram were established. In suspension flow, D >0. In stratified flow, D <0. While in slug flow, D ≈ 0. According to these criteria, flow regimes can be identified independently of changing trends of measurement parameters. The universality of above criteria was further verified under different operating conditions.

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Characterization on hydrodynamic behavior in liquid‐containing gas‐solid fluidized bed reactor

Cited by 39 publications

References 39 publications

Condensed Mode Cooling of Ethylene Polymerization in Fluidized Bed Reactors

Condensed Mode Cooling of Ethylene Polymerization in Fluidized Bed Reactors

Theoretical Model for Normal Impact between Dry Sphere and Liquid Layer with Considerable Thickness

Flow regime identification in horizontal pneumatic conveying by nonintrusive acoustic emission detection

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