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METHOD AND SYSTEM FOR CAPTURING CARBON DIOXIDE IN AN OXYFIRING PROCESS WHERE OXYGEN IS SUPPLIED BY REGENERABLE METAL OXIDE SORBENTS
METHOD AND SYSTEM FOR CAPTURING CARBON DIOXIDE IN AN OXYFIRING PROCESS WHERE OXYGEN IS SUPPLIED BY REGENERABLE METAL OXIDE SORBENTS
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机译:在可再生金属氧化物吸附剂供应氧气的氧化过程中捕获二氧化碳的方法和系统
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摘要
An oxyfiring system and method for capturing carbon dioxide in a combustion process is disclosed. The oxyfiring system comprises (a) an oxidation reactor for oxidizing a reduced metal oxide; (b) a decomposition reactor wherein a decomposition fuel is combusted and oxidized metal oxide sorbents are reduced with oxygen being released and a flue gas with an oxygen enriched carbon dioxide stream is produced; (c) a fuel combustion reactor for combusting a primary fuel and the oxygen enriched carbon dioxide stream into a primary flue gas; and (d) separation apparatus for separating a portion of the primary flue gas so that a carbon dioxide enriched stream can be prepared. The method comprises providing a primary fuel and an oxygen enriched carbon dioxide stream to a fuel combustion reactor. The primary fuel and oxygen enriched carbon dioxide stream are combusted into a primary flue gas stream which is split into a first flue gas portion and a second flue gas portion. The first flue gas portion is processed to produce a high purity carbon dioxide stream suitable for sequestration. The second flue gas portion is sent to the decomposition reactor to provide heat and serve as a fluid stream. The primary flue gas may include oxygen or else synthesis gas depending on whether the oxygen enriched carbon dioxide stream contains a stoichiometric excess or deficit of oxygen needed for complete combustion.
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