The raw air is compressed to 0.50 MPa in an air compressor after passing through an air filter, cooled by a pre-cooling system, and then enters the molecular sieve adsorber for switching. After being pre-cooled and purified, the majority of the air eventually enters the fractionation column. The purification system has two molecular sieve adsorbers, one working while the other is regenerated (the large air separation unit uses the heating regeneration method) and the two adsorption drums work alternately. In order to save energy and reduce consumption, the adsorbent is a Kawasaki type fractionated sieve with a switching time of 6 hours once.
For the heating phase of the regeneration gas (dirty nitrogen), the heat source used is two electric heaters (one for use and the other for standby), with steam heaters in series. In general, the use of one electric heater in series with a steam heater saves energy. The steam pressure of the user is limited and if a steam heater is used it can only reach 80 degrees, which is not the temperature required for the activation of the molecular sieve. The electric heaters are designed to be used alone to reach 170-180 degrees (the temperature required for molecular sieve regeneration). The electric heater and the neat heater in series have a significant energy saving effect.
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