In this work, a comprehensive lab-scale
carbon capture installation
was established to study the separation performances of CO
2
/N
2
systems for the postcombustion technology. Four kinds
of mono-/two-stage carbon capture methods containing membrane separation
and chemical absorption processes were investigated. The result shows
that the CO
2
capture performance of the one-stage membrane
separation method (
Memb
) exhibits a profitable CO
2
removal efficiency but defective CO
2
concentration,
while the one-stage chemical absorption method (
Chem
) indicates both CO
2
removal efficiency and CO
2
purity of more than 95.0% but suffers a regeneration heat of at
least 2.7 MJ/t CO
2
. The CO
2
purity of the two-stage
membrane separation method (
Memb
–
Memb
) is 46.2% higher than the
Memb
method because of
the additional membrane pretreatment. Two-stage methods have a superior
gas recovery efficiency of over 99.0%, which is dramatically higher
than the homogeneous
Memb
method. In addition, the
investigation on the hybrid chemical absorption–membrane separation
method (
Memb
–
Chem
) provides
an alternative approach to reduce the mass transfer and solve the
problems caused by an unequal mass flow distribution.
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