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STRUCTURAL TRANSFORMATIONS IN CA-BASED SORBENTS USED FOR SO2 EMISSION CONTROL
Citation:
Jozewicz, W. AND B K. Gullett*. STRUCTURAL TRANSFORMATIONS IN CA-BASED SORBENTS USED FOR SO2 EMISSION CONTROL. ZEMENT-KALK-GIPS INTERNATIONAL 47(1):31-38, (1994).
Impact/Purpose:
Published Journal Article
Description:
The paper discusses structural transformations in Ca-based sorbents used for SO2 emission control. conomizer temperature injection of Ca-based sorbents is an option for dry control of SO2 emissions from coal-fired boilers. heir reactivity with SO2 was found to be a function of their specific area. n the course of this work, Ca(OH)2 sorbents with specific surface areas from 2 to 79 sq m/g and porosities from 0.02 to 0.48 were produced from a number of commercial sources in a laboratory-scale hydrator by single or double hydration. ingle hydration produced Ca(OH)2 f rom CaCO3- derived CaO with specific surf ace areas up to 17. 3 sq m / g and porosities up to 0.29. Double hydration produced Ca(CH)2 from Ca(OH)2- derived CaO with specific surface areas up to 23 sq m/g and porosities up to 0. 33. n both types of hydration, a significant correlation was observed between the measured specific surface area and porosity of the CaO and its hydration product, Ca(CH)2. ased on the structural response of Ca(OH)2 following 550 C and exposure in the flow reactor, Ca(CH)2 with a high specific surface area (55-60 sq m/g) and high porosity (approximately 0.40) is recommended for economizer injection application.