Patent ID: 8747520
Filing Date: 2014-06-10
Classification: B01D,Y02C

Abstract:
1. A method for removing a preselected substance from a flue gas stream comprising: cooling the flue gas stream by direct contact with a cool liquid to remove water from the flue gas stream; compressing the flue gas stream to approximately 120 psia to remove additional water; dehydrating the compressed flue gas stream with either a first absorbent or a first adsorbent; cooling the compressed, dehydrated flue gas stream by indirect heat exchange with cold expanded flue gas components; contacting the compressed, dehydrated flue gas stream with a second absorbent or a second adsorbent to physically absorb or adsorb the preselected substance; regenerating the second absorbent or the second adsorbent, thereby releasing the preselected substance from the second absorbent or the second adsorbent into a separate stream; and expanding the compressed, dehydrated, treated flue gas stream through a gas expander, thus producing electric power, and cooling the expanded stream which is reheated by indirect heat exchange with the compressed, dehydrated flue gas stream.