A flue gas treatment system for removing CO 2 from a flue gas stream, comprising a flue gas compressor (144, 244), at least one flue gas adsorption drier (162, 262) downstream of the flue gas compressor (144, 244), a refrigeration system suitable for condensation of carbon dioxide (CO 2), in a flue gas stream, said system comprising a refrigeration circuit (151, 251) containing a refrigerant, wherein said refrigeration circuit comprises: a multistage refrigerant compressor (152, 252), a refrigerant condenser (153, 253) downstream of the multistage refrigerant compressor (152, 252), a refrigerant chiller (180, 280) downstream of the refrigerant condenser (153,253), a flue gas chiller (160, 260), at least one condenser (170, 270) having a cooling fluid for the flue gas that is supplied from the refrigerant chiller (180, 280) and is supplied to the multi stage refrigerant compressor (152, 252), the at least one condenser (170, 270) being downstream of the flue gas adsorption drier (162, 262), and a stripper column (171, 271) suitable for allowing distillation supplied with the flue gas cooled by the flue gas chiller (160, 260) and at least one condenser (170, 270); the stripper column (171, 271) having a reboiler (184, 284) suitable for vaporizing a part of carbon dioxide to generate the required gas stream for the strip column (171, 271), the heat being provided to the reboiler by the refrigerant by chilling the refrigerant in the refrigerant Chiller by indirect contact with cold purified CO 2 from the stopper column, wherein the flue gas chiller is arranged between the flue gas compressor and the flue gas adsorption drier and the the flue gas adsorption drier and the at least one condenser are arranged in series upstream of the stripper column, characterised in that said system comprises a first condenser (164, 264) being arranged in series upstream of the condenser (170, 270) and downstream of the flue gas adsorption drier (162, 262), wherein the first condenser (164, 264) is supplied with a refrigerant from the refrigerant chiller (180, 280) and supplies the refrigerant to the multistage refrigerant compressor (152, 252), the flue gas chiller (160, 260) has a cooling fluid for the flue gas that is supplied from the refrigerant chiller (180, 280) and is supplied to the multistage refrigerant compressor (152, 252), the flue gas chiller (160, 260) comprises an expansion valve suitable for reducing the pressure and inducing evaporation of the condensed refrigerant, and a heat exchanger, in which the refrigerant is suitable to be expanded to a pressure P1 and the boiling refrigerant is suitable to be used to indirectly chill the flue gas stream, the first condenser (164, 264) comprises an expansion valve, suitable for reducing the pressure and inducing evaporation of the condensed refrigerant and a heat exchanger, in which liquefied refrigerant is suitable to be expanded to a pressure P2 lower than P1 and the boiling refrigerant is used to indirectly chill the flue gas stream, the condenser (170, 270) comprises an expansion valve suitable for reducing the pressure and inducing evaporation of the condensed refrigerant and a heat exchanger, in which liquefied refrigerant is suitable to be expanded to a pressure P3 lower than P2 and the boiling refrigerant is used to indirectly chill the flue gas stream. a multistage refrigerant compressor (152, 252), a refrigerant condenser (153, 253) downstream of the multistage refrigerant compressor (152, 252), a refrigerant chiller (180, 280) downstream of the refrigerant condenser (153,253), a flue gas chiller (160, 260), at least one condenser (170, 270) having a cooling fluid for the flue gas that is supplied from the refrigerant chiller (180, 280) and is supplied to the multi stage refrigerant compressor (152, 252), the at least one condenser (170, 270) being downstream of the flue gas adsorption drier (162, 262),