| 摘要 |
PURPOSE:To efficiently recover CO2 gas from combustion exhaust gas using an amine type absorbent in the removal of acidic gas in combustion exhaust gas. CONSTITUTION:In the absorptive removal of acidic gas in combustion exhaust gas using an amine type absorbent, first and second absorption towers 1, 2 absorbing acidic gas in combustion exhaust gas using the amine based absorbent are arranged in series with respect to the flow of the combustion exhaust gas 5 to be treated. Combustion gas to be treated 10 is introduced into the second absorption tower 2 from the first absorption tower 1 and the absorbing liquid to the first absorption tower 1 is replenished with a part 6 of the absorbing liquid from the second absorption tower 2 and a part of the amine based absorbing liquid in the first and second absorption towers is drawn out to be sent to regeneration towers 3, 4 and, after regeneration, the regenerated absorbing liquid enhanced in absorbing capacity is supplied to the second absorption tower 2 to be circulated. Therefore, the CO2 absorbing capacity in the second absorption tower 2 can be always put to practical use while it is kept high and, since it is unnecessary to frequently regenerate the absorbing liquid having absorbed CO2, thermal deterioration can be miniaturized. |
