A variable diffusivity shrinking‐core model and its application to the direct sulfation of limestone
作者:
S. V. Krishnan,
Stratis V. Sotirchos,
期刊:
The Canadian Journal of Chemical Engineering
(WILEY Available online 1993)
卷期:
Volume 71,
issue 5
页码: 734-745
ISSN:0008-4034
年代: 1993
DOI:10.1002/cjce.5450710511
出版商: Wiley Subscription Services, Inc., A Wiley Company
关键词: shrinking‐core model;gas‐solid reactions;effective diffusivity;limestones;sulfation.
数据来源: WILEY
摘要:
AbstractA variable diffusivity shrinking‐core model that allows for temporal and spatial variation of the effective diffusivity in the solid product layer was developed in this study. The model was used to analyze a set of experimental data for the direct sulfation of three limestones (that is, their reaction with SO2 under noncalcining conditions), and a parameter estimation procedure was formulated for extracting the effective diffusivity as a distributed parameter from the experimental conversion vs. time curves. Very strong effects of temperature, concentration, and depth in the product layer on the effective diffusivity were revealed by the analysis. On the basis of the obtained results, it was concluded that despite being essentially nonporous, uncalcined limestones can react with SO, under noncalcining conditions at rates comparable to those of calcined samples because they present much lower resistance for diffusion of SO2 through the product layer than the latte
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