| 摘要 |
<p>PURPOSE:To remove carbon dioxide gas efficiently by allowing a combustion exhaust gas containing a small amount of a sulfur oxide to come in contact with an amine-based absorption liquid, then removing the carbon dioxide gas from the exhaust gas by absorption, and regenerate the amine-based absorption liquid by carbon dioxide gas removal. CONSTITUTION:Combustion exhaust gas containing about 100ppm max of sulfur oxide is introduced into an amine-based absorption column from a line 11, then a combustion exhaust gas is allowed to come in contact with the amine-based absorption liquid, and the carbon dioxide gas of the exhaust gas undergoes a chemical reaction with the amine-based absorption liquid remove the gas by absorption. A treated exhaust gas from which carbon dioxide gas is removed in the amine-based absorption column 1 is exhausted to an atmosphere. On the other hand, the amine-based absorption liquid in which the carbon dioxide gas is absorbed is extracted by a pump through a line 12 to be supplied to an absorption liquid regeneration process. Further, the amine-based absorption liquid is thermally regenerated in the first regeneration tower 2, and is circulated to the amine-based absorption column 1 through a line 22 as a regenerated absorption liquid. The carbon dioxide gas which is separated and desorbed in the first regeneration tower 2 is extracted through a line 21, then is sent to an outside area of the system through a gas/liquid separator, and finally is concentrated, recovered and hardened.</p> |
