Air filtration and compression. The air first enters the self-cleaning air intake filter where it enters the main Nitrogen Gas Generator after removing dust and other solid impurities and is compressed in multiple stages into the air-cooled tower. The heat between the compressor stages is cooled by the cooling water in the intercooler go.
Air cooling. The air is cooled and washed in an air-cooled tower before entering the molecular sieve adsorber. Chilled water entering the upper portion of the air-cooled tower is first cooled in a water-cooled tower using a nitrogen-free nitrogen and nitrogen from the dry fractionation tower, and then cooled to the upper portion of the air-cooled tower. The lower part of the air cooling tower uses the circulating water of the whole factory circulating water supply system to preliminarily cool the air.
Purification of the air. The air purification system consists of two molecular sieve adsorbers and two double-tube steam heaters. The molecular sieve adsorber adsorbs moisture, carbon dioxide and some hydrocarbons in the air. Two molecular sieve adsorber work, another regeneration. Regeneration of the heating by the steam in the steam heater to complete.
Air distillation. The air out of the adsorber is divided into two shares, one directly into the main heat exchanger cooling down into the tower; the other by air turbocharger further compression, and after the turbocharger cooler after cooling into the cold box by High pressure main heat exchanger cooling into liquid after throttling into the tower.
The expanded air is drawn from the middle of the turbocharger. After being compressed at the supercharger end of the expander and cooled by the aftercooler, the expanded air enters the main heat exchanger and cools down. After being expanded by the expander, it enters the lower tower.
Ascending gas in the lower column increases nitrogen content through contact with the refluxing liquid, obtaining pure nitrogen at the top of the column. The reflux liquid nitrogen needed at the top of the column comes from the condensing evaporator at the top of the lower column, where the oxygen is evaporated and the nitrogen is condensed. Oxygen is increased by the contact of the descending liquid with the rising vapor, and oxygen-enriched liquid is obtained at the bottom of the column. Under the tower after the liquid fractions through the cold, after throttling were sent to different parts of the tower for further separation, and in the top of the tower to get pure nitrogen, the bottom of the liquid oxygen.