Residence time distribution of solids in multistage fluidisation
TL;DR: In this paper, the residence time distribution of the solids in multistage fluidisation, wherein downcomers for transferring solids from stage to stage are provided to the horizontal perforated plates, is experimentally investigated covering a wide range in process variables using flat, baffle and spiral plates developed in the study.
About: This article is published in Chemical Engineering Science.The article was published on 1982-01-01. It has received 15 citations till now. The article focuses on the topics: Residence time distribution & Baffle.
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TL;DR: In this article, a hydrodynamic and kinetic model was developed and applied to simulate the experimental data from a three-stage fluidized bed pilot plant with downcomers, which was used to study the activated carbon production from a Spanish bituminous coal by steam gasification.
Abstract: A hydrodynamic and kinetic model was developed and applied to simulate the experimental data from a three-stage fluidized bed pilot plant with downcomers. This was used to study the activated carbon production from a Spanish bituminous coal by steam gasification. The steam gasification kinetics, considering the influence of inhibitors, were also determined in a thermobalance. With the kinetic equation and the experimental solids residence time distribution of the pilot plant, the model simulates the overall process that takes place in the reactor. The proposed model is able to reproduce the experimental results satisfactorily.
11 citations
TL;DR: In this paper, a small downcomer in which the moving bed height could be controlled was employed with the intention of using a downcomers as a connecting tube in a multi-stage spouted bed.
9 citations
01 Jan 2005
TL;DR: In this paper, three conceptual designs of atmospheric chemical-looping combustion (CLC) systems and their suitability were investigated and the results indicated that the design of the GRangemouth Advanced CO 2 CapturE Project (GRACE) prototype is flexible enough for operating conditions dependent on the reaction properties of the oxygen carriers.
Abstract: This chapter investigates the three conceptual designs of atmospheric chemical-looping combustion (CLC) systems and evaluates their suitability. The results exhibit that the design of the GRangemouth Advanced CO 2 CapturE Project (GRACE) prototype is examined in a cold flow model and is flexible enough for operating conditions dependent on the reaction properties of the oxygen carriers. The design concept of a large-scale demonstration is explored in order to map suitable conditions for a CLC plant. The concept is assessed as very well suitable for a 0.5 MW CLC demonstration plant but also forms a proper basis for larger units such as the 200 MW considered in the GRACE Grangemouth scenario. The chapter concludes that these results encourage the application of CLC in the mid-term also on solid fuels with an integrated gasification process.
8 citations
TL;DR: An analogy to the gas-liquid distillation model, based on the relative elutriation degree, was proposed in this paper for predicting the mean residence time (MRT) of the particles of each size.
5 citations
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TL;DR: In this paper, a three-parameter mathematical model for expressing the residence time distribution in multistage systems is proposed, in which a fraction of the feed short-circuits each stage consists of an active backmix region and a dead region with cross-flow of the material between the two regions.
25 citations
TL;DR: In this paper, the authors discussed the theoretical models, experimental data and the range of applicability along with the correlations to predict the characteristics of the bed and discussed the correlations with respect to the theoretical model and experimental data.
24 citations
TL;DR: In this paper, the cross-flow model was matched with the experimental data taken subsequently on the residence time distribution of solids in a multistage fluidised bed, and conditions for smooth fluidisation were suggested.
15 citations
9 citations