Book	PreJuSER-136138

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Freisetzung und Einbindung von Alkalimetallverbindungen in kohlebefeuerten Kombikraftwerken

Müller, M. (Corresponding author)FZJ*

2009
Forschungszentrum Jülich GbmH Zentralbibliothek, Verlag Jülich
ISBN: 978-3-89336-568-0

Please use a persistent id in citations: http://hdl.handle.net/2128/3619

Abstract: Coal fired combined cycle power systems will be a sufficient way to increase the efficiency of coal combustion. However, combined cycle power systems require a reliable hot gas cleanup. Especially alkali metals, such as sodium and potassium, can lead to hot corrosion of the gas turbine blading if they condensate as sulphates. The actual work deals with the release and sorption of alkali metals in coal fired combined cycle power systems. The influence of coal composition, temperature and pressure on the release of alkali species in coal combustion was investigated and the relevant release mechanisms identified. Alumosilicate sorbents have been found that reduce the alkali concentration in the hot flue gas of the Circulating Pressurized Fluidized Bed Combustion 2nd Generation (CPFBC 2$^{nd}$ Gen.) at 750 °C to values sufficient for use in a gas turbine. Accordingly, alumosilicate sorbents working at 1400 °C have been found for the Pressurized Pulverized Coal Combustion (PPCC). The sorption mechanisms have been identified. Thermodynamic calculations were performed to upscale the results of the laboratory experiments to conditions prevailing in power systems. According to these calculations, there is no risk of hot corrosion in both processes. Furthermore, thermodynamic calculations were performed to investigate the behaviour of alkali metals in an IGCC with integrated hot gas cleanup and H2 membrane for CO$^{2}$ sequestration.

Note: Record converted from JUWEL: 18.07.2013

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Contributing Institute(s):

1. Werkstoffstruktur und Eigenschaften (IEF-2)

Appears in the scientific report 2013

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Database coverage:

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