Recirculatory System

A recirculatory system comprising a combustion chamber, means to cause fuel to combust in the combustion chamber, means to exhaust exhaust gas from the combustion chamber, a circuit through which the exhaust gas is fed from the combustion chamber and some of the exhaust gas is returned to the combustion chamber and the circuit including means to treat at least some of the exhaust gas to remove a part therefrom, wherein the means to treat at least some of the exhaust gas to remove part therefrom comprises means to treat the exhaust gas with a liquid to absorb said part into the liquid and means to desorb the part absorbed in the liquid from the liquid at a position outside the circuit and within a pressure wall which encloses the system.