Why CCUS needs heat recovery
The energy penalty of post-combustion capture is real: regenerating the amine solvent in the stripper is the single largest energy consumer in a CCUS train. Recovering low-grade heat elsewhere in the plant directly lowers that penalty and improves solvent economy.
Where the heat is
Flue gas leaves the boiler or turbine warm; the stripper overhead carries latent heat in vapor; and compression stages reject steady heat. All are candidates for recovery into feed pre-heat or reboiler duty.
Recovery that survives the stream chemistry
Flue gas and amine streams are corrosive and can contain CO2, SOx and moisture, so the recovery device must resist attack and keep loops isolated. A corrosion-proof or all-welded plate handles the duty where a gasketed plate would fail. As with carbon-neutral manufacturing, recovery is a front-line decarbonization lever.
Integration
Recovered flue-gas heat pre-heats boiler feed or stripper feed; overhead vapor heat is reclaimed to the reboiler. The net effect is a smaller regeneration energy gap.