METHOD AND APPARATUS FOR COLLECTING CARBON DIOXIDE FROM FLUE GAS
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United States of America Patent
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Apr 18, 2013
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Oct 18, 2010
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A method for collecting carbon dioxide from flue gas. The method includes: 1) mixing an aqueous solution of sodium carbonate with an amino alcohol activator to yield a CO2 absorbent; spraying the CO2 absorbent into the flue gas to produce a sodium bicarbonate slurry; 2) thermally decomposing the sodium bicarbonate slurry to produce a highly concentrated CO2 gas and an aqueous solution of sodium carbonate; 3) returning the aqueous solution of sodium carbonate to step 1) to form the CO2 absorbent for recycling; 4) cooling the highly concentrated CO2 gas for condensing hot water vapor therein; 5) carrying out gas-liquid separation on the highly concentrated CO2 gas, removing condensed water to yield highly purified CO2 gas; and 6) drying, compressing, and condensing the highly purified CO2 gas. An apparatus for collecting carbon dioxide from flue gas according to the method is also provided.
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