exhaust gas purification enables the use of hot potassium carbonate based absorbent but will also enable and enhance other co 2 capture methods such as amines amino acids ammonium carbonate membranes or dry co 2 absorbent based systems table 1 below is an illustration on the input and output from an exemplary plant according to the present invention to illustrate the total efficiency obtained by the present solution table 1 refers to fig1 without extra firing in boiler 20 from a fuel gas line 101 table 2 below shows the feed gas to the co 2 absorber for the exemplary plant shown in table 1 note the partial pressure of co 2 which is about 0 3 bare although much higher than for gas turbine flue gas at atmospheric pressure this is relatively low for hot potassium carbonate based co 2 capture where partial pressure of 0 5 bara or higher is preferred such low partial pressure may result in somewhat lower co 2 capture rate than the desired 90 note also the actual volume flow of gas which is very low for a 108 mw system enabling the use of a relatively small diameter co 2 capture column table 3 below is an illustration of.