With the rapid development of industry, nitrogen has been widely used in chemical, electronics, metallurgy, food, machinery, China's annual growth rate of more than 8% of nitrogen demand. The chemical properties of nitrogen are inert, showing great inertia in the ordinary state, and it is not easy to react chemically with other substances. Therefore, in the metallurgical industry, nitrogen electronics industry, chemical industry widely used protective gas sealing gas, gas purity general protection requirements of 99.99%, and some requirements of high purity nitrogen 99.998% or more. Liquid nitrogen is a more convenient cold source and has been used more and more widely in the food industry, pharmaceutical companies and livestock semen storage. In the fertilizer industry to produce synthetic ammonia, refined raw gas hydrogen nitrogen mixture, if the use of pure nitrogen to wash ammonia, so that a small inert gas content, sulfur dioxide and oxygen content below 20ppm.

Pure nitrogen can not be directly sketched, mainly using the air separation method. Includes: low temperature air separation methods, pressure swing adsorption (PSA), membrane separation. Now, nitrogen is mainly used for industrial gas business, large, there are many machine manufacturers are also in nitrogen nitrogen production, as long as the nitrogen machine will be produced professionally, although the state has developed machinery manufacturers to produce more nitrogen. Low temperature nitrogen is not the mainstream equipment because it is used, the equipment is complex, and the area is large, so it is not the mainstream equipment, therefore, the molecular sieve air nitrogen has a very mature, especially on it is very convenient to use, can realize the automation of the operation, and it occupies a relatively small area, and the operating cost is greatly reduced.

So now is the choice of nitrogen machine type is PSA nitrogen machine, then what is its principle. First of all, it is in the process of screening, adding carbon molecules, the carbon molecules adsorbed in the gas of oxygen and nitrogen, the ambient temperature, and then the function of the whole machine itself, nitrogen and oxygen separation, and finally can obtain high purity nitrogen, but also because its main work is based on the screen, so it is used as a molecular sieve of nitrogen machine.