The Common Way Of Making Nitrogen In Industrial Manufacture

There are mainly three ways to get nitrogen from industry: A deep cooling air separation nitrogen machine, deep cooling air separation nitrogen is a traditional nitrogen making method. It has been in recent decades. It is made of air as raw material, compressed and purified, and then liquefied by heat exchange to liquefy the air. Liquid air is mainly a mixture of liquid oxygen and liquid nitrogen. The boiling point of liquid oxygen and liquid nitrogen is different (at 1 atmospheric pressure, the boiling point of the former is -183 C, the latter is -196 C), and the nitrogen is separated by liquid air distillation. The cryogenic air separation system has many advantages, such as complex nitrogen facilities, large area occupied, high capital construction cost, high investment in equipment, high running cost, slow gas production (12 ~ 24h), high installation requirement and long cycle. Integrated equipment, installation and infrastructure factors, the equipment below 3500Nm3/h, the same specification of the PSA device investment scale is 20% to 50% lower than the cryogenic air separation unit. The deep cold air separation plant is suitable for large-scale industrial nitrogen production, and the medium and small scale nitrogen making appears uneconomical. B molecular sieve is made from nitrogen and air as raw material, and carbon molecular sieve as adsorbent. Based on the principle of pressure swing adsorption, the method of separating nitrogen and oxygen from the selective adsorption of oxygen and nitrogen by carbon molecular sieve is commonly referred to as PSA nitrogen. This method is a new technology of nitrogen making, which developed rapidly in 70s. Compared with the traditional nitrogen method, it has simple process, high degree of automation, rapid gas production (15 ~ 30 minutes), low energy consumption, product purity in wide range can be adjusted according to user needs, convenient operation and maintenance, low operation cost, strong adaptability and other characteristics of device, so the Suzhou Kaijiang Gas Equipment Co. corporation competitive nitrogen equipment in the 1000Nm3/h below, more and more small and medium-sized nitrogen users, PSA nitrogen has become the method of choice for small and medium-sized nitrogen users. C membrane air separation system takes air as raw material, and under certain pressure, it uses oxygen and nitrogen and other gases of different properties to separate oxygen and nitrogen in membrane. Compared with other nitrogen equipment it has simpler structure, smaller size, less maintenance, no switching valve, gas production faster (less than 3 minutes), has the advantages of convenient capacity, it is particularly suitable for the purity of nitrogen is less than or equal to 98% small and medium-sized nitrogen users have the best function price ratio. When the purity of nitrogen is above 98%, it is more than 15% higher than the same standard PSA nitrogen making equipment.