method for capturing carbon dioxide in power station flue gas and device therefor

摘要

A method and apparatus for collecting carbon dioxide from a flue gas in a power plant is disclosed. The method of the present invention comprises the steps of: 1) using a complex absorbent aqueous solution comprising an organic amine and an ionic liquid as the CO ₂ absorbent; 2) forming different liquid layers through persistence and transparency; 3) A and by performing the heating and decomposition to the enriched solution a mixture of CO ₂ and B and CO _2, and - the step of recycling to obtain a concentrated CO _2, and the composite absorbent solution; 4) recycling the aqueous solution of the composite absorbent obtained in step 3); 5) cooling the high-condensed CO ₂ gas to produce high-temperature steam as condensate; 6) performing a gas-liquid separation in the high-concentrated CO ₂ gas cooled in step 5) to obtain a CO ₂ gas having a purity of 99% or more; And 7) converting the high purity CO ₂ gas to a liquid to obtain a liquid carbon dioxide product for the high-concentration industry. The method of the present invention has a high collection rate, low energy consumption, and a simple process.