Absorption of HCl and HF by Ca-based sorbents at FBC conditions

A4 Conference proceedings

Internal Authors/Editors

Publication Details

List of Authors: Partanen J, Backman P, Hupa M
Editors: Geiling DW
Publication year: 2001
Publisher: American Society of Mechanical Engineers, ASME
Book title: Proceedings of the 16th international conference on fluidized bed combustion
Volume number: 16
Start page: 194
End page: 204
ISBN: 9780791835234
ISSN: 0197-453X


In fluidized bed combustion of S-​contg. fuels, adding limestone or dolomite to the bed is a widely applied method to control SO2 emissions. In this work, HCl and HF adsorption by Ca-​based sorbents was studied in the lab. at different temps. from concns. inside the boiler furnace to those in the second pass (850-​650°)​. The effect of temp., absorbent quality, and gas atm. on HCl and HF removal by Ca-​sorbents was examd.; special emphasis was placed on studying the effect of molten-​phase formation in HCl absorption. Expts. were conducted isothermally using a thermogravimetric app. specially designed to study solid-​gas reactions. Two limestones and 1 dolomite absorbent were tested; the effect of gas compn. was examd. by varying CO2, water, and SO2 concns. in a simulated flue gas mixt. Absorbent conversions were calcd., and SEM- and energy dispersive spectrometry-​observations were conducted to study the reaction pattern inside the absorbent particles. HF was very reactive, and conversions to CaF2 were close to 100​%. CaCl2 was also formed at 650° and 850°, but the conversion was highly dependent on water and SO2 concns.

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