Effect of pressure and alkalinity on the reactivity of Ca(OH)2-fly ash sorbents used for SO2 removal

Nilgün Karatepe*, Ayse Özyuguran, Aysegül Ersoy-Meriçboyu

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The effects of hydration variables on the physical properties of the sorbents prepared from fly ash-Ca(OH)2 mixtures were investigated and compared. It was observed that low fly ash/Ca(OH)2 weight ratios can be appropriate when pressure hydration and alkali added atmospheric hydration techniques are used instead of atmospheric hydration. Pressure hydration fosters the formation of a sorbent reactive to SO2 from fly ash- Ca(OH)2.in a much shorter time than by atmospheric hydration. The sulphation capacities of the hydrated sorbents were also determined. Measured SO2 captures and Ca(OH)2 conversion values of the hydrated sorbents were ranged between 1.43 and 3.61 mmole SO2/g sorbent and 28.22 % and 68.37 %, respectively. It was found that SO2 captures varied significantly depending on the physical and chemical properties of the hydrated sorbents. An empirical relation between the SO2 capture and surface area of the sorbents was obtained.

Original languageEnglish
Title of host publicationECOS 2006 - Proceedings of the 19th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
EditorsChristos A. Frangopoulos, Constantine D. Rakopoulos, George Tsatsaronis
PublisherNational Technical University of Athens
Pages1679-1684
Number of pages6
ISBN (Electronic)9608758424
Publication statusPublished - 2006
Event19th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2006 - Aghia Pelagia, Crete, Greece
Duration: 12 Jul 200614 Jul 2006

Publication series

NameECOS 2006 - Proceedings of the 19th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems

Conference

Conference19th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2006
Country/TerritoryGreece
CityAghia Pelagia, Crete
Period12/07/0614/07/06

Keywords

  • Fly ash
  • Hydration
  • Sorbent
  • Sulphation

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