| 摘要 |
A mixed gas concentration regulating method and a concentration regulating apparatus, in which the maintenance of the recovery of an easily permeable gas and the restraint of the power expense are compatible, are provided. A mixed gas concentration regulating apparatus which comprises a pressure raising line having boosters C11, C12 for raising the pressure of a mixed gas consisting of two or more gases different in permeability, a line L1 for leading out a part of the mixed gas from said pressure raising line, a gas separation section for separating the gas fed from said line L1 to a permeate gas and a retentate gas by gas separation membranes M1, M2, and a line for introducing said permeate gas into said pressure raising line, is characterized in that said gas separation section is composed of plural stages S1, S2, where respective stages are connected with each other by a line L3 for feeding a retentate gas of the preceding stage to a gas separation section S2 of the succeeding stage and lines are provided for introducing permeate gases of the respective stages into said pressure raising line separately or after they are joined, and the pressure difference of said pressure raising line is utilized so that the pressure ratio on the feed side and permeation side is made larger as in the gas separation section of the latter stage side. <IMAGE> |
