PSA Nitrogen Generators system is simple, the main equipment includes air compressor, air dryer, adsorption nitrogen and gas tank and so on. The cryogenic nitrogen production process is complex, the number of equipment, the main equipment are air compressor, air cooler, air purification dryer, heat exchanger, expander and stream tower.
Product type and purity comparison: cryogenic nitrogen can not only produce nitrogen and can produce liquid nitrogen, to meet the needs of liquid nitrogen process requirements, and can be stored in liquid nitrogen storage tank, when the nitrogen intermittent load or air separation equipment minor repair, The liquid nitrogen in the sump enters the carburetor and is heated and fed into the product nitrogen pipe to meet the nitrogen demand of the process plant. The operation period of cryogenic nitrogen production (refers to the interval between two large heating cycles) is generally more than 1 year, therefore, cryogenic nitrogen generally do not consider the reserve.
The pressure swing adsorption nitrogen can only produce nitrogen, no spare means, a single set of equipment can not guarantee continuous long cycle operation. Cryogenic nitrogen can be prepared purity ≧ 99.999% of nitrogen. The nitrogen purity is limited by the nitrogen load, the number of trays, the efficiency of the trays and the oxygen purity in the liquid air, and the adjustment range is very small. Therefore, for a set of cryogenic nitrogen equipment, the purity of its products is basically a certain, inconvenient to adjust. The nitrogen purity of the nitrogen produced by pressure swing adsorption is generally in the range of 95% -99.9%. If nitrogen is needed to increase the purity of nitrogen, it is necessary to increase the nitrogen purification equipment. Nitrogen purity is only affected by the nitrogen load of the product. Under other conditions, the greater the nitrogen emission, the lower the purity of nitrogen, and vice versa. Therefore, for a set of pressure swing adsorption nitrogen equipment as long as the load allows its product purity can be arbitrarily adjusted between 90-99.9%.