The air compressed by the air compressor uses specific adsorbent activated alumina and molecular sieve to remove water, carbon dioxide, acetylene, etc. As an adsorbent, molecular sieve can adsorb many other gases, and it has obvious tendency in the adsorption process. The larger the polarity of molecules of similar size, the more easily adsorbed by molecular sieve, and the larger the unsaturated molecules, the more easily adsorbed by molecular sieve. It mainly adsorbs H2O, CO2, C2, H2 and other CnHm impurities in the air; In addition to the adsorption capacity of molecular sieve related to the type of adsorbed substances, but also related to the concentration of adsorbed substances, and temperature, so compressed air before entering the purification system but also through the air cooling tower to reduce the temperature of the air before entering the purification system, and the water content in the air is related to temperature, the lower the temperature the lower the water content. Therefore, the purification system first passes through the air cooling tower to reduce the air temperature, thereby reducing the water content in the air.
The compressed gas from the air cooling tower is fed into the purification system, which is mainly composed of two adsorbers, a steam heater and a liquid-gas separator. The molecular sieve adsorber is a horizontal bunk bed structure, the lower layer is loaded with activated alumina, the upper layer is loaded with molecular sieve, and the two adsorbers switch work. When one adsorber is working, the other adsorber is regenerated and cold blown for use. The compressed air from the air cooling tower is removed by the adsorber of water, CO2 and other impurities such as CnHm. Molecular sieve regeneration is composed of two stages, one is the dirty nitrogen from the air fractionator, heated by the steam heater to the regeneration temperature, enter the adsorber to heat regeneration, parse out the adsorbed water and CO2, called the heating stage, the other is the dirty nitrogen not through the steam heater, blow the high temperature adsorber to room temperature, will parse out the adsorbed water and CO2 out of the adsorber. It’s called the cold blow phase. The waste nitrogen used for heating and cold blowing is discharged into the atmosphere through a blowdown silencer.
Post time: Aug-24-2023
