With the rapid development of industry, nitrogen has been widely used in chemical industry, electronics, metallurgy, food, machinery, China's annual growth rate of more than 8% of the demand for nitrogen. 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 is widely used as a protective gas and sealing gas, gas purity general protection requirements of 99.99%, some require high purity nitrogen more than 99.998%. Liquid nitrogen is a more convenient cold source and has been used more and more widely in the food industry, medical enterprises and livestock semen storage. In the process of synthetic ammonia production in the fertilizer industry, the refined raw gas mixture of hydrogen and nitrogen, if the ammonia is washed with pure liquid nitrogen, makes a small inert gas content, sulfur dioxide and oxygen content less than 20ppm.

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

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