Cryogenic Air Separation Rectification Unit

Cryogenic Liquid Oxygen Plant

Work Principle

The basic principle of air separation is use cryogenic rectification to condense air into liquid and separate the air according to the evaporation temperature of each component. The two-stage rectification tower simultaneously obtains pure nitrogen and pure oxygen at the top and bottom of the upper tower. It is also possible to take out liquid oxygen and liquid nitrogen from the evaporation side and the condensation side of the main cooling respectively. The air separation in the rectification tower is divided into two stages, air is separated for the first time in the lower tower to obtain liquid nitrogen and at the same time obtain oxygen- enriched liquid air. The oxygen- enriched liquid air is sent to the upper tower for rectification to obtain pure oxygen and pure nitrogen. The upper tower is divided into two sections: with the liquid- air inlet as the boundary. the upper part is the rectification section, which rectifies the rising gas, recovers the oxygen component, and purifies the nitrogen purity, and the lower section is the stripping section to remove nitrogen components in the liquid, separated to improve the oxygen purity of the liquid.

KunPeng has Air Separation Plants, Liquid Oxygen / Nitrogen Plant,  PSA Oxygen/Nitrogen Generator,  VPSA Oxygen / Nitrogen Generator, and so on.  If there is any need, feel free to contact us.

Cryogenic equipment not only has a complex process flow, a large number of equipment, but also needs to operate in a cryogenic and low temperature state. Before the equipment is put into normal operation, there is a pre-cooling start-up process. The start-up time is generally not less than 12 hours from the start of the expander to the required gas purity. Before the equipment is overhauled, there must be a period of heating and thawing time, generally 24 hours. Therefore, cryogenic separation oxygen production equipment is not suitable for occasions where frequent starts and stops. 

Cryogenic separation of oxygen can obtain gas oxygen and liquid oxygen at the same time, which is suitable for the process flow that requires liquid oxygen. Liquid oxygen can also be stored in the liquid oxygen storage tank as a backup. When there is a short-term sudden increase in oxygen demand or a minor repair of the oxygen production equipment, the liquid oxygen in the storage tank can be vaporized and sent to the oxygen pipe network to meet the requirements of the process equipment for oxygen continuity requirements. 

Cryogenic liquid oxygen plant has many spare parts and equipment, long process flow and large floor space. We need to design an optimization plan according to specific needs. If you have any needs, please contact me, my tel/whatsapp: 008616763286270