CO2 recovery system and method
AssigneesMitsubishi Heavy Industries, Ltd., The Kansai Electric Power Co., Inc.
InventorsMasaki Iijima, Takashi Kamijo, Takahito Yonekawa, Tomio Mimura, Yasuyuki Yagi
Life of this patent
Estimating the term…
Abstract
A CO2 recovery system includes an absorption tower and a regeneration tower. CO2 rich solution is produced in the absorption tower by absorbing CO2 from CO2-containing gas. The CO2 rich solution is conveyed to the regeneration tower where lean solution is produced from the rich solution by removing CO2. A regeneration heater heats lean solution that accumulates near a bottom portion of the regeneration tower with saturated steam thereby producing steam condensate from the saturated steam. A steam-condensate heat exchanger heats the rich solution conveyed from the absorption tower to the regeneration tower with the steam condensate.
Claims1
A CO2 recovery system including an absorption tower that receives CO2-containing gas and CO2-absorbing solution, and causes the CO2-containing gas to come in contact with the CO2-absorbing solution to produce CO2 rich solution, and a regeneration tower, including an upper-portion regeneration tower and a lower-portion regeneration tower, that receives the rich solution and produces lean solution from the rich solution by removing CO2 from the rich solution, the CO2 recovery system comprising:
- a bottom lean-solution extraction path that extracts lean solution that accumulates near a bottom portion of the regeneration tower from a first point of the regeneration tower and returns extracted lean solution to a second point of the regeneration tower that is downstream of the first point;
- a regeneration heater arranged in the bottom lean-solution extraction path and heats the lean solution in the bottom lean-solution extraction path with saturated steam thereby producing steam condensate from the saturated steam;
- a steam-condensate heat exchanger that heats, with the steam condensate, either one of
- (a) the rich solution that is supplied from the absorption tower to the regeneration tower, and
- (b) a semi-lean solution that is extracted outside from a middle portion of the regeneration tower and returned to the middle portion of the regeneration tower;
- an upper semi-lean-solution extraction path that extracts semi-lean solution from an eleventh point of the upper-portion regeneration tower and returns extracted semi-lean solution to a twelfth point of the upper-portion regeneration tower that is downstream of the eleventh point;
- a lean-solution supply member that extracts the lean solution from the regeneration tower and conveys extracted lean solution to the absorption tower;
- and
- a lean-solution heat exchanger that is arranged in the upper semi-lean-solution extraction path and the lean-solution supply member and heats the semi-lean solution in the upper semi-lean-solution extraction path with the lean solution in the lean-solution supply member.
Dependencies are inferred from the claim text.