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Testing of minerals and industrial by-products as oxygen carriers for chemical-looping combustion in a 300W test reactor

Patrick Moldenhauer
Göteborg : Chalmers tekniska högskola, 2009. 50 s.
[Examensarbete på avancerad nivå]

Carbon dioxide emissions have been increasing significantly over the course of the last two hundred years. A higher CO2 concentration in the atmosphere enhances the greenhouse effect, which is believed to lead to a severe global climate change. Hence, emissions of CO2 into the atmosphere have to be reduced. The biggest emitter of greenhouse gases is the electricity and heat industry. A reduction of emissions in this sector would have a great impact in terms of reduction of emissions. Chemical-looping combustion is a rather new technology, where the separation of the CO2 happens as part of the process and does not implicate an efficiency penalty. An oxygen carrier is circulated between an air and a fuel reactor. In doing so, it transports the necessary combustion oxygen from the air to the fuel. Air and fuel are never mixed and after condensing the water, the stream of flue gases consists of nearly pure CO2. The common approach was to synthesize oxygen carrier particles, which made them expensive and only available in small quantities. The employment of alternative sources for oxygen carrier particles would further chemical-looping combustion a great deal. In this work chemical-looping combustion experiments were performed in a 300W test reactor with ilmenite (a mineral oxygen carrier) and iron oxide scales (an industrial by-product). Both oxygen carriers were operated for tens of hours, which allowed for a better understanding of the lifetime behavior and other basic characteristics. The gathered data indicates that both oxygen carriers could be an alternative to synthesized particles.

Nyckelord: chemical-looping combustion (CLC), CO2 capture, oxygen carrier, ilmenite, iron oxide scales, syngas

Publikationen registrerades 2011-08-30. Den ändrades senast 2014-09-02

CPL ID: 145405

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