Pressure swing adsorption for hydrogen extraction is based on the physical adsorption of gas molecules on the internal surface of the adsorbent (porous solid substance). The adsorbent is easy to adsorb high-boiling point components under the same pressure, but not easy to adsorb low-boiling point components, and the adsorption amount increases under high pressure (adsorption part), while the adsorption amount decreases under reduced pressure (desorption part). The raw material gas passes through the adsorbent bed at pressure. Compared with the high boiling point impurity component of hydrogen, the low boiling point component of hydrogen is not easily adsorbed, and through the adsorbent bed, the separation of hydrogen and impurity composition is achieved. Then, the adsorbent is regenerated by desorption of the attached impurity components under reduced pressure to facilitate the adsorption and separation of impurities again.

The four adsorption towers of the device are alternately adsorbed, desorption and desorption preparation processes to achieve continuous hydrogen production. In the process of adsorption-desorption, a part of the high purity is still retained in the adsorbed tower, and this part of the high purity oxygen is used to balance the pressure and rinse the other two towers that have just desorbed. Qualified ammonia decomposition gas passes through the pressure swing adsorption system operated alternately by the adsorption tower to adsorb and separate all impurities at one time to obtain high purity finished hydrogen with qualified purity and impurity content.

Main process steps:

The first step: liquid ammonia raw materials through high temperature gasification into ammonia gas

Step 2: The ammonia purification unit is used to remove the water and residual ammonia

The third step: The decomposed hydrogen is increased by PSA process