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A kinetic study of gaseous alkali capture by kaolin in the fixed bed reactor equipped with an alkali detector

Artikel i vetenskaplig tidskrift
Författare Khanh-Quang Tran
Kristina Iisa
Britt-Marie Steenari
Oliver Lindqvist
Publicerad i Fuel 84
Volym 2-3
Sidor 169-175
ISSN 0016-2361
Publiceringsår 2005
Publicerad vid
Sidor 169-175
Språk en
Ämnesord Author Keywords: alkali capture; biomass combustion; kaolin; solid sorbents; kinetics; surface ionization detector
Ämneskategorier Miljökemi

Sammanfattning

In this study, the interaction between gas phase potassium species and kaolin was investigated in a fixed bed reactor equipped with a surface ionization detector, which is capable of detecting alkali metals in gas phase at ppb level. The effects of mass transport, space time, sorbent temperature and concentration of KCl on the rate of potassium adsorption on kaolin were studied in air. Kaolin, mainly composed of kaolinite-Al2Si2O5(OH)(4), was found to be very efficient in removing gaseous alkali species from hot flue gases at fluidized bed combustion temperatures. The removal efficiency increased as temperature was decreased or KCl concentration was increased. The capture of potassium by kaolin was irreversible with formation of both water-soluble and water-insoluble products. Kaolin captured KOH almost as effectively as KCl, but K2SO4 was captured much less effectively than KCl. (C) 2004 Elsevier Ltd. All rights reserved.

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