NDLI: Capture of Alkali Metals by Kaolin

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Tran, Khanh-Quang Iisa, M. Kristiina Steenari, Britt-Marie Lindqvist, Oliver Hagstro¨m, Magnus Jan, B. C. Pettersson
Copyright Year	2003
Abstract	Alkali metals present in biomass fuels may cause increased bed agglomeration during fluidized bed combustion. In worst case this may lead to complete defluidization of the bed. Other problems caused by alkali metals include increased fouling and slagging. One possibility to reduce the impact of alkali metals is to add sorbents, e.g. aluminosilicates, to the bed for the capture of alkali metals. In the current investigation, the capture of vapor phase potassium compounds by kaolin was investigated in a fixed bed reactor. The reactor consisted of an alkali metal source placed at a variable temperature from which gaseous potassium compounds were generated, a fixed bed holding the kaolin, and an on-line detector for the alkali metal concentration. The on-line alkali metal detector was based on ionization of alkali metals on hot surfaces and is capable of detecting alkali metals down to ppb levels. This makes it possible to perform experiments at alkali metal concentrations relevant to fluidized bed combustion of biomass fuels. In the experiments, KCl was used as the alkali metal source with inlet concentrations of 0.5–3.5 ppm. The experiments were performed at reactor temperatures of 800–900°C and a contact time of 0.26 s. The capture efficiencies of KCl were always above 97%. The capture efficiency was somewhat higher in oxidizing than in reducing gas atmospheres. In the oxidizing gas atmosphere, the conversion was slightly higher with H2O addition than without. The capture efficiency decreased slightly as temperature or KCl concentration was increased.
Sponsorship	Advanced Energy Systems
Starting Page	403
Ending Page	409
Page Count	7
File Format	PDF
ISBN	0791836800
DOI	10.1115/FBC2003-083
e-ISBN	0791836754
Conference Proceedings	17th International Conference on Fluidized Bed Combustion
Language	English
Publisher Date	2003-05-18
Publisher Place	Jacksonville, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Water Temperature Potassium compounds Fluidized bed combustion Alkali metals Sorbents Vapors Biomass Fuels Ionization Sensors Agglomeration (materials) Kaolin
Content Type	Text
Resource Type	Article

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