PSA method is based on molecular sieve selective adsorption of oxygen and nitrogen components in the air to separate the air to obtain oxygen.When air is compressed and passes through an adsorption column containing a molecular sieve, nitrogen molecules are preferentially absorbed and oxygen molecules remain in the gas phase, becoming oxygen.When the adsorption reaches equilibrium, the adsorbed nitrogen molecules on the surface of the molecular sieve can be removed by vacuum or vacuum to restore the adsorption ability of the molecular sieve.In order to provide oxygen continuously, the device usually has two or more adsorption towers, one for oxygen absorption and the other for desorption.
PSA method can produce oxygen with purity of 90~ 95%, with simple process, normal temperature operation, high level of automation, unmanned management can be realized, especially good safety, low operating pressure of the device in the vacuum desorption process, and the container is not controlled by the pressure vessel specification.
Due to the large amount of PSA molecular sieve, its size is limited, and it is generally suitable for occasions less than 10000m3/h.
