Carbon dioxide recovery apparatus and method
View Patent ↗An apparatus that separates and recovers CO 2 from a CO 2 absorbent that has absorbed CO 2 includes a regeneration tower configured to apply heat to the CO 2 absorbent that has absorbed CO 2 , configured to separate and remove CO 2 from the CO 2 absorbent, configured to exhaust CO 2 gas, and configured to regenerate the CO 2 absorbent, a plurality of compressors configured to compress the CO 2 gas exhausted from the regeneration tower, a dehydration device provided between the plurality of compressors and configured to remove moisture from the compressed CO 2 , and a line configured to supply air or N 2 gas into the dehydration device to preliminarily operate the dehydration device until a stable state is achieved before starting the compressor.
1. An apparatus for separating and recovering CO 2 from a CO 2 absorbent that has absorbed CO 2 , the apparatus comprising:
a regeneration tower configured to apply heat to the CO 2 absorbent that has absorbed CO 2 , configured to separate and remove CO 2 from the CO 2 absorbent, configured to exhaust CO 2 gas, and configured to regenerate the CO 2 absorbent;
a plurality of compressors configured to compress the CO 2 gas exhausted from the regeneration tower;
a dehydration device provided between the plurality of compressors and configured to remove moisture from the compressed CO 2 ;
a CO 2 gas line connecting the regeneration tower, the plurality of compressors and the dehydration device;
an air or N 2 gas line configured to supply air or N 2 gas into the dehydration device to preliminarily operate the dehydration device until a stable state is achieved before starting the compressor, the air or N 2 gas line being separate from the CO 2 gas line;
a bypass line which is provided between the plurality of compressors and bypasses the dehydration device provided between the plurality of compressors, the bypass line being separate from the CO 2 gas line; and
a circulation line which is provided between the plurality of compressors and configured to circulate CO 2 until a concentration of water or a concentration of O 2 in the compressed CO 2 is decreased to a predetermined concentration, the circulation line being separate from the CO 2 gas line.
2. The apparatus according to claim 1 , further comprising a deoxidization device configured to remove O 2 from air to be supplied to the dehydration device.
3. The apparatus according to claim 1 , further comprising an O 2 concentration meter configured to measure the concentration of O 2 in the compressed CO 2 .