Hydrogen containing gas mixture into the PSA adsorption tower, the adsorption bed adsorbent on adsorption capacity of each gas mixture in the with the change of pressure difference, pressure when the adsorption of impurities in the raw material gas, is not easy to absorb the components of hydrogen from the outlet end of the adsorption bed as the product output, decompression. The adsorption of impurities The components were desorbed and desorbed while the adsorbent was regenerated. At least four adsorption beds are used to achieve continuous hydrogen output。

Control mode and characteristics：

Control mode: The SPA device is controlled by the controller and meter. The controller can select DCS, FCS and PLC control system according to the scale and control requirements of the SPA device。

Characteristics: It not only realizes the conventional control of the system, but also realizes the expert control and adaptive optimization control of arbitrary combination and switching of multiple towers, which not only improves the operational flexibility of the device, but also ensures the long-term, stable and safe operation of the PSA device。

Feed gas:

Methanol cracking gas、Ammonia cracking gas、Methanol Tail Gas、Formaldehyde emission gas

Conversion gas、refined gas、hydrocarbon steam conversion gas、fermentation gas、polysilicon tail gas

Semi-water Gas、city gas、coke oven gas

FCC dry gas in Refinery、Refinery reforming tail gas

Other gas sources containing H2

Overview of PSA hydrogen production process

PSA process is mainly divided into vacuum pressure swing adsorption (VPSA) and fast pressure swing adsorption (RPSA). The PSA cycle usually includes steps such as adsorption, pressure balancing, reverse discharge, regeneration (vacuum), and final charging. VPSA increased the pumping time after the reverse release to increase the absorption of adsorbent, desorption and regeneration effect; RPSA uses higher pressure change rates and shorter cycle times to achieve faster adsorption and desorption rates. Therefore, it is necessary to have high adsorption capacity and fast adsorption/desorption performance. In this study, activated carbon and 5A molecular sieve were used as adsorbents to simulate the hydrogen production process of six-tower RPSA process, and the effects of feed flow, rinse flow ratio and adsorbent loading height on RPSA performance were investigated. The results show that the RPSA process has high hydrogen yield but low recovery rate, and it needs to be combined with adsorbent that can adsorb/desorption quickly to avoid waste of resources. In addition, the technical variables that affect the hydrogen production performance of PSA include feed time, intake pressure, adsorption time, purge time and adsorption bed number.

The selection of adsorbent

The selection of adsorbents is crucial to the performance of PSA hydrogen production, and the commonly used adsorbents are zeolite, activated carbon, carbon molecular sieve (CMS), metal-organic framework (MOFs) and activated alumina. The characteristics and adsorption characteristics of PSA hydrogen adsorbent are shown in Table 2. According to the selectivity of adsorbents for different gas components, researchers often use a variety of adsorbents as bedfilled adsorbents in order to handle complex feedstock gases, such as the absorption of CO and N2 with zeolite, and the absorption of CO2 and CH4 with activated carbon