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Experimental Investigation of the SO2 Abatement Capacity of South African Calcium-Based Materials

[+] Author Affiliations
Zachary O. Siagi, Makame Mbarawa

Tshwane University of Technology, Pretoria, Gauteng, South Africa

Paper No. ES2007-36141, pp. 121-126; 6 pages
doi:10.1115/ES2007-36141
From:
  • ASME 2007 Energy Sustainability Conference
  • ASME 2007 Energy Sustainability Conference
  • Long Beach, California, USA, July 27–30, 2007
  • Conference Sponsors: Solar Energy Division and Advanced Energy Systems Division
  • ISBN: 0-7918-4797-7 | eISBN: 0-7918-3798-X
  • Copyright © 2007 by ASME

abstract

One of the most important steps in the wet limestone-gypsum flue gas desulphurization (WFGD) process is CaCO3 dissolution, which provides the dissolved alkalinity necessary for SO2 absorption. Accurately evaluating the CaCO3 dissolution rate is important in the design and efficient operation of WFGD plants. In the present work, the dissolution of limestone from different sources in South Africa has been studied in a pH-stat apparatus under conditions similar to those encountered in wet FGD processes. The influence of various parameters such as the reaction temperature (30 ≤ T ≤ 70°C), CaCO3 particle size (25 ≤ dp ≤ 63μm), solution acidity (4 ≤ pH ≤ 6), and chemical composition were studied in order to determine the kinetics of CaCO3 dissolution. The results obtained indicate that the dissolution rate increased with a decrease in particle size and an increase in temperature. The dissolution curves were evaluated in order to test the shrinking core model for fluid–solid systems. The analysis indicated that the dissolution of CaCO3 was controlled by chemical reaction, i.e. 1 − (1 − X)1/3 = kt.

Copyright © 2007 by ASME

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