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000031394 1001_ $$0P:(DE-Juel1)VDB7701$$aWolf, Karl Josef$$b0$$eCorresponding author$$uFZJ
000031394 245__ $$aUntersuchungen zur Freisetzung und Einbindung von Alkalimetallen bei der reduzierenden Druckwirbelschichtverbrennung
000031394 260__ $$aJülich$$bForschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2003
000031394 300__ $$a145 p
000031394 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis
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000031394 4900_ $$0PERI:(DE-600)2414853-2$$88703$$aBerichte des Forschungszentrums Jülich$$v4078$$x0944-2952
000031394 502__ $$aAachen, Techn. Hochsch., Diss., 2003$$bDr. (FH)$$cTechn. Hochsch. Aachen$$d2003
000031394 500__ $$aRecord converted from VDB: 12.11.2012
000031394 520__ $$aModern 2$^{nd}$ Generation Pressurized Fluidized Bed Combustion (PFBC) Combined Cycle Power Systems are 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 severe damage of the gasturbine blading due to hot corrosion. The investigations described in this thesis were performed to determine the potential of alkali metal reduction from hot gases by alumosilicate sorbents under reducing atmospheres at 750 °C. Using a flow channel reactor, an alkalichloride laden gas stream was passed through a bed of alumosilicate sorbent. Both, qualitative and quantitative analysis of the hot gas downstream the sorbent bed was achieved using High Pressure Mass Spectrometry (HPMS). Thus, the influence of several different gas atmospheres on the alkalisorption behavior could be observed and conclusions be drawn concerning the chemical reactions occuring inside the sorbent bed. Several annealing experiments were performed to determine the maximum loading capacity of the sorbent, subsequent REM and XRD analysis showed the phases formed inside the tested sorbent materials. Finally, thermodynamic calculations were done to upscale the results of the laboratory experiments to conditions prevailing in 2$^{nd}$ Gen. PFBC systems. The investigations revealed the possibility of reducing the overall alkaliconcentration in the hot gas under 2$^{nd}$ Gen. PFBC conditions to values < 25 ppb$_{vol}$ by alumosilicate sorbents.
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