Nitrogen making molecular sieve

In the industrial field, nitrogen generator is widely used in petrochemical, natural gas liquefaction, metallurgy, food, pharmaceutical and electronics industry. The nitrogen products of nitrogen generator can be used as instrument gas, but also as industrial raw materials and refrigerant, which is a necessary public equipment in industrial production. The process of nitrogen generator is mainly divided into three kinds: deep cold air separation method, membrane separation method and molecular sieve pressure change adsorption method (PSA).
Deep cold air separation method is to use the different boiling point principle of oxygen and nitrogen in the air, and the production of liquid nitrogen and liquid oxygen through the principle of compression, refrigeration and low temperature distillation “. This method can produce low temperature liquid nitrogen and liquid oxygen, large production scale; the disadvantage is large investment, generally used in nitrogen and oxygen demand in metallurgy and chemical industry.
Membrane separation method is the air as raw material, under certain pressure conditions, using oxygen and nitrogen in the membrane with different permeability rates to make oxygen and nitrogen separation?. This method has the advantages of simple structure, no switching valve, small volume, etc., but because the membrane material mainly depends on imports, the current price is expensive and the penetration rate is low, so it is mainly used for special purposes of small flow, such as mobile nitrogen making machine.
Molecular sieve pressure adsorption method (PSA) is the air as raw material, carbon molecular sieve as adsorbent, the use of pressure adsorption principle, the use of carbon molecular sieve for oxygen and nitrogen adsorption and oxygen and nitrogen separation method “. This method has the characteristics of simple process flow, high degree of automation, low energy consumption and high nitrogen purity, and it is the most widely used technology. Before the air enters the human adsorption tower, the water in the air must be dried to reduce the erosion of water on the molecular sieve and extend the service life of the molecular sieve. In the conventional PSA nitrogen production process, the drying tower is commonly used to remove the moisture in the air. When the drying tower is saturated with water, the drying tower is blown back with the dry air to realize the regeneration of the drying tower.