A dehydration-compression system (10; 110; 210) comprising: multiple compressors for compressing CO 2 containing H 2 O; and a dehydration device (60; 160; 260) for separating the H 2 O from the CO 2, wherein the dehydration device (60; 160; 260) comprises: a contactor which removes the H 2 O from the CO 2 by bringing the CO 2 and a dehydration solvent into contact with each other and absorbing the H 2 O into the dehydration solvent; a dry CO 2 carrying passage (L 12) where the CO 2 with the H 2 O removed flows through; a first recovery part which recovers the CO 2 from the dehydration solvent discharged from the contactor; and a first circulating passage (L 31) which carries the CO 2 discharged from the first recovery part, to a flow passage on the upstream side of the contactor, wherein the dehydration device (60; 160; 260) is installed between adjacent compressors of the multiple compressors with respect to a flow of the CO 2 or on the downstream side of the multiple compressors, and the first circulating passage (L 31) is connected with a flow passage (L 41) on the upstream side of the compressor located on the upstream side of the contactor, and wherein the first circulating passage (L 31) branches at an intermediate position, and the first circulating passage (L 31) is connected with the flow passage (L 41) on the upstream side of the compressor located on the upstream side of the contactor, and with a flow passage between the compressor and the contactor. multiple compressors for compressing CO 2 containing H 2 O; and a dehydration device (60; 160; 260) for separating the H 2 O from the CO 2, wherein the dehydration device (60; 160; 260) comprises: a contactor which removes the H 2 O from the CO 2 by bringing the CO 2 and a dehydration solvent into contact with each other and absorbing the H 2 O into the dehydration solvent; a dry CO 2 carrying passage (L 12) where the CO 2 with the H 2 O removed flows through; a first recovery part which recovers the CO 2 from the dehydration solvent discharged from the contactor; and a first circulating passage (L 31) which carries the CO 2 discharged from the first recovery part, to a flow passage on the upstream side of the contactor, wherein the dehydration device (60; 160; 260) is installed between adjacent compressors of the multiple compressors with respect to a flow of the CO 2 or on the downstream side of the multiple compressors, and the first circulating passage (L 31) is connected with a flow passage (L 41) on the upstream side of the compressor located on the upstream side of the contactor, and wherein the first circulating passage (L 31) branches at an intermediate position, and the first circulating passage (L 31) is connected with the flow passage (L 41) on the upstream side of the compressor located on the upstream side of the contactor, and with a flow passage between the compressor and the contactor. a contactor which removes the H 2 O from the CO 2 by bringing the CO 2 and a dehydration solvent into contact with each other and absorbing the H 2 O into the dehydration solvent; a dry CO 2 carrying passage (L 12) where the CO 2 with the H 2 O removed flows through; a first recovery part which recovers the CO 2 from the dehydration solvent discharged from the contactor; and a first circulating passage (L 31) which carries the CO 2 discharged from the first recovery part, to a flow passage on the upstream side of the contactor, wherein the dehydration device (60; 160; 260) is installed between adjacent compressors of the multiple compressors with respect to a flow of the CO 2 or on the downstream side of the multiple compressors, and the first circulating passage (L 31) is connected with a flow passage (L 41) on the upstream side of the compressor located on the upstream side of the contactor, and wherein the first circulating passage (L 31) branches at an intermediate position, and the first circulating passage (L 31) is connected with the flow passage (L 41) on the upstream side of the compressor located on the upstream side of the contactor, and with a flow passage between the compressor and the contactor.