Acidic gas collection system

A gas collection method, comprising:

• contacting an acidic gas mixture including a weak acidic gas and a strong acidic gas with an amine solution, at least a portion of the strong acidic gas being absorbed into the amine solution and removed from the acidic gas mixture;
• adding an alkaline compound to the amine solution to react with the strong acidic gas absorbed therein to form a solid reaction product;
• separating the solid reaction product from the amine solution;
• contacting the amine solution from which the solid reaction product has been separated with the acidic gas mixture from which at least the portion of the strong acidic gas has been removed, and removing at least a portion of the weak acidic gas from the acidic gas mixture by absorbing the portion of the weak acid gas in the amine solution;
• and
• heating the amine solution in which at least the portion of the weak acidic gas has been absorbed to discharge at least the portion of the weak acidic gas absorbed therein.

A gas collection apparatus, comprising:

• a first unit configured to receive a first gas stream comprising a gas mixture including a strong acidic component and a weak acidic component and to contact the gas mixture with an amine solution, which absorbs at least a portion of the strong acidic component, and to output a second gas stream including the gas mixture not absorbed by the amine solution and a first solution output stream including the amine solution and at least the portion of the strong acidic component absorbed therein;
• a second unit configured to receive the second gas stream from the first unit and to contact the gas mixture therein with the amine solution, which absorbs at least a portion of the weak acidic component, and to output a third gas stream including the gas mixture not absorbed by the amine solution and a second solution output stream including the amine solution and at least the portion of the weak acidic gas component absorbed therein;
• a third unit configured to receive the second solution output stream, to separate the weak acidic gas component from the amine solution, to output a collection gas stream including the weak acid gas component separated from the amine solution, and to output a third solution output stream including the amine solution after separation of the weak acidic gas component;
• and
• a fourth unit configured to receive the first solution output stream from the first unit and at least a portion of at least one of the second solution output stream from the second unit and the third solution output stream from the third unit, the fourth unit being configured to store amine solution in a storage tank, to measure a pH level of the amine solution in the storage tank, to add an alkaline compound to the amine solution based on the measured pH level, and to separate a solid reaction component formed by reaction of the alkaline compound and the strong acidic component from the amine solution, the amine solution from the fourth unit being supplied to the first and second units.