The invention discloses a method for jointly separating
hydrogen through
pressure swing adsorption and unpowered membrane separation. The method comprises a one-stage
pressure swing adsorption, a two-stage
pressure swing adsorption and a regeneration step, wherein the regeneration step specifically comprises the following steps that: reverse release is carried out after uniform pressure drop of a one-stage pressure swing adsorption
tower, the reverse release is carried out after the uniform pressure drop of a two-stage pressure swing adsorption
tower, the one-stage pressure swing adsorption
tower is subjected to the first washing by the reverse
gas release of the two-stage pressure swing adsorption tower, uniform
pressure rise of the two-stage pressure swing adsorption tower is carried out, then the two-stage pressure swing adsorption tower is subjected to high-pressure washing by using
hydrogen, and at the same time, the high-pressure washing gas is introduced in a membrane separation device, permeate gas with high
hydrogen content is recycled, un-permeate gas is used for carrying out the second washing on the one-stage pressure swing adsorption tower, and the one-stage pressure swing adsorption tower is subjected to the uniform
pressure rise after the washing is accomplished. The invention further discloses a device for jointly separating hydrogen through pressure swing adsorption and unpowered membrane separation. The method and device have the advantages of high yield, high
hydrogen purity, low cost investment and low
energy consumption.