The molecular sieve adsorber of the purification system of the air separation unit is used to remove water, carbon dioxide and some hydrocarbons from the feed air, so as to ensure that the subsequent fractionator system will not freeze.
In the development process, the early air separation unit placed the removal of water, carbon dioxide and hydrocarbons in a low-temperature environment, which was synchronized with heat exchange. It has gone through the stages of cold accumulator and switching plate process. The shortcomings of the above two stages are relatively prominent. Especially in operation, operation cycle, extraction rate and energy consumption. Development status, use molecular sieve adsorbent to remove the above impurities. The adsorber adopts vertical or horizontal structure according to the size of the device. It is decided to use single or double layers according to the working environment. According to practical experience, most large-scale units adopt horizontal double bed structure.
The air separation industry is tackling major technical problems in the purification system
a. Effective solution to the problem of uniform distribution of air flow;
b. Effective solution to the problem of thermal expansion and cold contraction deformation of large cross-section bed under alternating temperature;
c. Elimination of wall flow effect;
d. Ensure the flatness of the bed surface;
e. Treatment of powder falling from molecular sieve adsorber.
With the increasing size of the unit, Deere air separation is leading the industry in tackling key technical problems, discussing with each other among industries, and ensuring the high quality and efficiency of manufacturing equipment.
