Defluidization modelling of pyrolysis of plastics in a conical spouted bed reactor

Aguado, Roberto; Prieto, R.; José, María; Álvarez, Sonia; Olazar, Martı́n; Bilbao, Javier

doi:10.1016/j.cep.2004.02.016

Cited by 104 publications

(64 citation statements)

References 12 publications

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“…Moreover, the improvement of the reactor design by means of the installation of mechanical devices to break the aggregates such as stirring blades has been applied to fight defluidization [15,16]. These studies can be summarized as attempts to modify somehow the gassolid fluidized bed dynamics trying to overcome defluidization conditions [12].…”

Section: Introductionmentioning

confidence: 99%

Fluidized bed with a rotating distributor operated under defluidization conditions

Gómez-Hernández

Soria-Verdugo

Briongos

et al. 2012

Chemical Engineering Journal

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h i g h l i g h t sThe capability of a rotating distributor to recover a defluidized bed was analyzed. Defluidization was reached by injecting a punctual volume of water on the bed surface. Fluidization and recovery processes were analyzed in the time and frequency domain. An excellent agreement was found for the time and frequency domain results. The rotating distributor improves the fluidization quality of a defluidized bed. Keywords: Fluidized bed Liquid injection Defluidization Rotating distributor a b s t r a c tThe fluidization conditions of a rotating distributor applied to a 3-D bubbling fluidized bed was studied to assess its potential use as a counteracting measure of defluidization phenomena. The performance of the fluidized bed operating under nominal conditions was characterized for the rotating and the static distributor configuration. Different methods of analysis in the time and frequency domain were applied to establish the performance of the fluidized bed. The frequency domain analysis suggests some kind of local structuring of fluidized bed dynamics imposed by the distributor motion. The punctual injection of water over the surface of the bed lead to a high cohesive wet region that tend to settle down on top of the distributor giving rise to defluidization. The water-induced defluidization tests reflect an improvement of the fluidization quality with the distributor rotation.

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Section: Introductionmentioning

confidence: 99%

Fluidized bed with a rotating distributor operated under defluidization conditions

Gómez-Hernández

Soria-Verdugo

Briongos

et al. 2012

Chemical Engineering Journal

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“…Pyrolysis of biomass [42][43][44][45][46][47], waste plastic [48,49], scrap tires [50,51] and sludge [52][53][54][55] have been tested and validated at lab and pilot scale. Also, the combustion of wood charcoal [56], biomass [57][58][59], sludge from the paper industry [60] or eventually toxic wastes [61] has been object of several studies as well as the gasification of coal [62,63], biomass [64][65][66][67], sewage sludge [68], flame retardants textile products [69] and mixtures of biomass with plastics [46] or coal [70].…”

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confidence: 99%

Modelling of Spouted and Spout-Fluid Beds: Key for Their Successful Scale Up

et al. 2017

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The development of robust mathematical models could provide the necessary tools for a more rapid, efficient, and reliable spouted bed technology development. Computer simulations can be very useful to aid this design and scale-up process: firstly, they can contribute to obtain a fundamental insight into their complex dynamic behavior by understanding the elementary physical principles such as drag, friction, dissipation etc.; secondly, the simulations can be used as a design tool where the ultimate goal is to have a numerical model with predictive capabilities for gas-particle flows at engineering scale. Clearly, one single simulation method will not be able to achieve this goal, but a hierarchy of methods modelling phenomena on different length and time scales can achieve this. The most fruitful approach will be when they are simultaneously followed, so that they can mutually benefit from each other. In this sense, this paper presents a review of the current state of the art of modelling on spouted and spout-fluid beds through an analysis of recent literature following a multiscale approach (molecular and particle, lab, plant and industrial scale). The main features of the different scales together with their current limits are discussed and specific topics are highlighted as paths that still need to be explored. In summary, the paper aims to define the theoretical setline and the basis of improvement that would lead to a robust multiscale model with solid links between micro and macroscopic phenomena. If done with the correct balance between accuracy and computational costs it will gear SB towards their reliable and successful implementation.

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“…[11] Spouted beds have also proven to be especially suitable to avoid defluidisation. [12,13] In the past 50 years, many valuable experimental and theoretical studies on hydrodynamics of spouted beds have been carried out, which can be seen in detail in Epstein and Grace. [14] In recent years, spouted bed technology has been regarded as an effective method for the thermo-chemical applications of solid waste, which usually have irregular shapes.…”

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confidence: 99%

Spouting of non‐spherical particles in conical‐cylindrical spouted bed

et al. 2013

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Experiments on the spouting of non-spherical particles in a conical-cylindrical spouted bed, with an inside diameter of 200 mm and a conical base of 60°, were carried out. The minimum spouting status of six kinds of non-spherical particles, the equi-volume sphere diameter ranges from 1.9 to 6.2 mm and the sphericity ranges from 0.73 to 0.95, were tested and compared with two spherical particles. It was found that the changes of minimum spouting velocity with initial bed height and spout gas inlet diameter were similar to the spouting of spherical particles in conventional spouted beds, while decrease in particle sphericity would lead to an increase in the minimum spouting velocity. The tested minimum spouting velocities were well represented by the MathurÀGishler equation of U ms , however a more satisfied prediction could be achieved for non-spherical particles when replacing d p in MathurÀGishler equation with a modified term w À0.5 d v .

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Defluidization modelling of pyrolysis of plastics in a conical spouted bed reactor

Cited by 104 publications

References 12 publications

Fluidized bed with a rotating distributor operated under defluidization conditions

Fluidized bed with a rotating distributor operated under defluidization conditions

Modelling of Spouted and Spout-Fluid Beds: Key for Their Successful Scale Up

Spouting of non‐spherical particles in conical‐cylindrical spouted bed

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