1. Cryogenic nitrogen production
Deep cooling nitrogen production is a traditional nitrogen production method that uses air as the raw material, undergoes compression, purification, and then uses heat exchange to liquefy the air into liquid air. Liquid air is mainly a mixture of liquid oxygen and liquid nitrogen. By utilizing the different boiling points of liquid oxygen and liquid nitrogen, they are separated through distillation to obtain nitrogen.
Advantages: No harmful exhaust gas is generated, protecting the environment and achieving green production; High purity nitrogen can be obtained, with a purity of over 99.999%.
Disadvantages: The nitrogen production process requires a large amount of refrigerant and energy consumption, resulting in high production costs; The process flow is complex, there are many equipment, and maintenance costs are high; The startup time is long, usually between 15 to 40 hours, and it must run continuously without interruption.
3. Pressure swing adsorption nitrogen production
Under normal temperature and pressure, the physical air separation method for oxygen and nitrogen separation is achieved by utilizing the difference in adsorption capacity of carbon molecular sieves for oxygen and nitrogen.
Advantages: Simple process flow, high degree of automation, fast gas production, and low energy consumption;
Short startup time, usually less than 30 minutes, can run continuously or intermittently;
The equipment has a simple structure and low maintenance and upkeep costs;
The equipment occupies a small area and has no special requirements for the factory building area;
Short installation cycle and low installation cost.
Disadvantage: The purity can generally only reach 95%~99.9995%. If higher purity nitrogen is needed, subsequent treatment or purification is necessary.
