Air Separation Plants For Oxygen Nitrogen Argon Production

Process Description

（ Oxygen Production Equipment / Nitrogen Production Equipment）The feed air is sucked into the self-cleaning air filter through the suction port to remove dust and mechanical impurities and then passes into the centrifugal air compressor. After being compressed, the feed air flows into the air cooler in the air pre-cooling unit to be cooled by refrigerant. The air from the pre-cooling system enters the purification system to get rid of moisture, carbon dioxide, and hydrocarbons. A portion of the clean air from the purification system enters the main heat exchanger in the cold box and is cooled by the return gas. The air cooled to be certain temperature enters the bottom of the lower column for the first rectification.

In the rectification column, the rising gas and the descending liquid contact are full for heat and mass transfer, so the nitrogen content in the rising gas increases gradually. The pure nitrogen passes into the main condenser evaporator mounted on top of the lower column for condensation. When the gaseous nitrogen is being condensed, the liquid oxygen in the condenser is evaporated. The liquid air and liquid nitrogen generated in the lower column enter the upper column as reflux after sub-cooling and throttling. In the upper column after further rectification, product gas oxygen, product gas nitrogen, waste nitrogen, and product liquid oxygen are obtained.