| 摘要 |
A method for capturing carbon dioxide in a power station flue gas and a device therefor. The method comprises the following steps: 1) using a composite aqueous absorbent consisting of an organic amine and a functionalized ionic liquid as a CO2 absorbent; 2) forming different liquid layers through still clarification; 3) performing heating and resolution on a liquid obtained by separating and rich in A·CO2 and B·CO2, to recycle to obtain a high-concentration CO2 gas and the composite aqueous absorbent; 4) recycling the composite aqueous absorbent obtained in Step 3); 5) cooling the high-concentration CO2 gas, to make hot water vapor therein condense; 6) performing gas-liquid separation on the high-concentration CO2 gas undergone the cooling in Step 5), to obtain a CO2 gas with the purity ≥99%; 7) turning the high-purity CO2 gas into the liquid, to obtain a high-concentration industrial-grade liquid carbon dioxide product. The method has features of high capture efficiency, low energy consumption, and simplicity in the process. |
