Apparatus for reducing greenhouse gas emission in vessel and vessel including the same

An apparatus for reducing greenhouse gas emission in a vessel, the apparatus comprising:

• a seawater supply unit that supplies seawater;
• an absorbent liquid producing unit that produces and supplies a high-concentration CO2 absorbent liquid;
• an absorption tower comprising a CO2 removing unit that cools exhaust gas discharged from a vessel engine by reacting the exhaust gas with the seawater supplied from the seawater supply unit, and removes CO2 by reacting the cooled exhaust gas with the absorbent liquid supplied from the absorbent liquid producing unit to convert CO2 into an aqueous ammonium salt solution;
• and
• an absorbent liquid recycling unit comprising a primary recycling unit that primarily recycles the absorbent liquid by reacting the aqueous ammonium salt solution discharged from the absorption tower with an aqueous divalent metal hydroxide solution, and a secondary recycling unit that secondarily recycles the high-concentration absorbent liquid by additionally reacting the aqueous divalent metal hydroxide solution with an unreacted aqueous ammonium salt solution supplied from the primary recycling unit and circulates and supplies the recycled absorbent liquid to the absorption tower for reuse as the absorbent liquid.