The influence of particle residence time distribution on the reactivity in fluidized bed reactors

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Heesink, A.B.M. and Klaus, J. and Swaaij van, W.P.M. (1994) The influence of particle residence time distribution on the reactivity in fluidized bed reactors. Chemical Engineering Science, 49 (14). pp. 2243-2261. ISSN 0009-2509

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Abstract:The influence of particle residence time distribution on the average conversion rate (or reactivity) of particles undergoing a non-catalytic gas-solid reaction inside a continuously operated fluidized bed reactor is evaluated. A so called ß-factor is defined as the ratio of the actual reactivity in the reactor and the reactivity of a batch of particles that react under similar circumstances and that all have a conversion extent equal to the average conversion extent in the reactor. The ß-factor concept is elaborated for shrinking core conversion behaviour. According to Heesink et al. (1993), three extreme types of conversion behaviour are distinguished: core reaction limitation, product-layer diffusion limitation and grain reaction limitation. For each type of behaviour a mathematical function is derived that expresses ß as function of average particle conversion, maximum attainable conversion (with regard to pore plugging) and a new-defined expansion factor, which is a measure for the expansion (or shrinking) of the reacting solid during conversion. These functions can be easily incorporated in fluidized bed reactor models.
Item Type:Article
Copyright:© 1994 Elsevier Science
Faculty:
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/11233
Official URL:http://dx.doi.org/10.1016/0009-2509(94)E0044-Q
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