Solid fuels in chemical-looping combustion using a NiO-based oxygen carrier |
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Authors: | Henrik Leion Anders Lyngfelt Tobias Mattisson |
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Affiliation: | aDepartment of Environmental Inorganic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden;bDepartment of Energy and Environment, Chalmers University of Technology, S-412 96 Göteborg, Sweden |
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Abstract: | The feasibility of using three different solid fuels in chemical-looping combustion (CLC) has been investigated using NiO as oxygen carrier. A laboratory fluidized-bed reactor system for solid fuel was used, simulating a chemical-looping combustion system by exposing the sample to alternating reducing and oxidizing conditions. In each reducing phase 0.2 g of fuel was added to the reactor containing 20 g oxygen carrier. The experiments were performed at 970 °C. Compared to previously published results with other oxygen carriers the reactivity of the used Ni-particles was considerably lower for the high-sulphur fuel and higher for the low-sulphur fuel. Much more unconverted CO was released and the fuel conversion was much slower for high-sulphur fuel such as petroleum coke, suggesting that the nickel-based oxygen carrier was deactivated by the presence of sulphur. The NiO particles also showed good reactivity with methane and a syngas mixture of 50% H2 and 50% CO. For all experiments the oxygen carrier showed good fluidizing properties without any signs of agglomeration. |
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Keywords: | CO2-capture Chemical-looping combustion Oxygen carrier Fluidized bed Nickel oxide Coal Petroleum coke |
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