US 12,440,799 B2
Post-combustion CO2 capture with heat recovery and integration
Sylvain Lefebvre, Saint-Gebriel-de-Valcartier (CA); and Ferrere Clerveaux, Québec (CA)
Assigned to Saipem S.P.A., Milan (IT)
Appl. No. 16/972,107
Filed by SAIPEM S.P.A., San Donato (IT)
PCT Filed Jun. 5, 2019, PCT No. PCT/CA2019/050781
§ 371(c)(1), (2) Date Dec. 4, 2020,
PCT Pub. No. WO2019/232626, PCT Pub. Date Dec. 12, 2019.
Claims priority of provisional application 62/681,363, filed on Jun. 6, 2018.
Prior Publication US 2021/0220771 A1, Jul. 22, 2021
Int. Cl. B01D 53/14 (2006.01); B01D 53/26 (2006.01); B01D 53/34 (2006.01); B01D 53/62 (2006.01); B01D 53/78 (2006.01); B01D 53/96 (2006.01); F28D 7/00 (2006.01)
CPC B01D 53/1475 (2013.01) [B01D 53/1425 (2013.01); B01D 53/265 (2013.01); B01D 53/343 (2013.01); B01D 53/346 (2013.01); B01D 53/62 (2013.01); B01D 53/78 (2013.01); B01D 53/96 (2013.01); F28D 7/0066 (2013.01); B01D 2251/306 (2013.01); B01D 2251/606 (2013.01); B01D 2252/103 (2013.01); B01D 2252/20405 (2013.01); B01D 2252/20484 (2013.01); B01D 2252/602 (2013.01); B01D 2257/504 (2013.01); B01D 2258/0283 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A CO2 capture process for capturing CO2 from flue gas generated by a host facility, the process comprising:
in an absorption stage, directly contacting a flue gas stream with an absorption solution comprising water, potassium carbonate, and a biocatalyst that is free in solution and represented by a carbonic anhydrase to absorb CO2 and form a CO2-rich solution and a CO2 depleted gas;
in a stripping stage, subjecting the CO2-rich solution to vacuum pressure conditions and temperature conditions below 100° C. to cause the release of CO2 from the CO2-rich solution to form a regenerated solution and an overhead gas stream comprising CO2 and steam;
recycling the regenerated solution back into the absorption stage as at least part of the absorption solution;
subjecting the overhead gas stream to heat recovery, comprising:
compressing the overhead gas stream or a gas stream derived therefrom to increase a temperature thereof and produce a compressed gas stream;
transferring heat from the compressed gas stream to a heat transfer fluid to form a heated fluid, the transferring comprising condensing water contained in the compressed gas stream; and
transferring heat from the heated fluid to the stripping stage,
wherein the transferring heat from the compressed gas stream to the heat transfer fluid and/or the transferring heat from the heated fluid to the stripping stage is performed by indirect heat exchange;
removing the condensed water from the compressed gas stream;
recycling the condensed water back into the regenerated solution to produce an aqueous regenerated solution;
feeding a first portion of the aqueous regenerated solution back into the absorption solution for said recycling the regenerated solution;
heating a second portion of the aqueous regenerated solution to generate a vaporized regeneration solution; and
recycling the vaporized regeneration solution into the stripping stage.