Nitrogen yield increasing method for use in air separation unit

• Main Authors: TANG ENRONG, LIN YINGZE, CHEN ZHENGZHONG
• Format: Patent
• Language: Chinese; English
• Published: 23.05.2012
• Subjects: BLASTING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; HEATING; LIGHTING; LIQUEFACTION SOLIDIFICATION OF GASES; LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS; MANUFACTURE OR STORAGE OF ICE; MECHANICAL ENGINEERING; MIXTURES BY PRESSURE AND COLD TREATMENT; REFRIGERATION OR COOLING; WEAPONS

The invention relates to a nitrogen yield increasing method and device for use in an air separation plant, particularly to the improvement of a nitrogen water precooling system for use in the air separation plant. The nitrogen flow of the nitrogen water precooling system is reduced and the nitrogen is guided into a nitrogen compressor for future use. In order to enable gas entering into a molecular sieve absorption system to be without higher saturated water vapor, the absorption effect is reduced. The nitrogen yield increasing method improves the refrigerating capacity of a refrigerator and can reduce the temperature of the cooling water entering in an air cooling tower and the temperature of the air exiting from the air cooling tower, enhance the cooling effect of the air cooling tower and therefore increase the yield of nitrogen products. According to the nitrogen yield increasing method provided by the invention, the usage amount of air separation units can be reduced, and with respect to the increment of