https://doi.org/10.1016/j.egypro.2017.03.1289
“The NGCC application presents a unique opportunity to integrate the flue gas cooling function of the DCC unit into
the absorber column itself. Typically, the DCC is operated as a separate contacting vessel where cooling water is used
to cool and saturate the incoming flue gas, removing the excess water in the flue gas. In NGCC applications, the water
content (which is associated with the CO2 content of the flue gas via the combustion process) may be sufficiently low
that, as the temperature of the flue gas is reduced, water is not transferred from the flue gas to the cooling water.
Therefore, if amine solvent is used to perform the flue gas cooling function, it will not condense water from the flue
gas, avoiding a potential water balance and management issue for the amine stream in the process. In this work, the
following representative NGCC gas composition will be used:”
“As the table indicates, the water content of 7.6 mol % in the flue gas is consistent with saturation at 40 °C, which
is the target absorber operating temperature in this analysis. Therefore, th e DCC unit will be eliminated, and gas
cooling will take place in the bottom of the absorber itself using the amine solvent as the cooling media. In this case,
the recycle and hybrid intercooling designs are ideal for integrating the DCC due to the additional degree of freedom
for defining an independent L/G in specific column sections. All advanced intercooling designs in this work will
integrate the DCC into the absorber.”