With the rapid development of industry, nitrogen has been widely used in chemical industry, electronics, metallurgy, food, machinery, China's annual demand for nitrogen increased by more than 8%. The chemical nature of nitrogen is inert, showing a great inertia in the ordinary state, not easy to react with other substances.
Therefore, in the metallurgical industry, the nitrogen of the electronics industry, the chemical industry is widely used as protective gas and sealing gas, gas purity general protection requirements 99.99%, and some require high purity nitrogen more than 99.998%. Liquid nitrogen is a more convenient cold source, which has been used more and more widely in food industry. In the process of synthetic ammonia production in the chemical fertilizer industry, the raw material gas is mixed with hydrogen and nitrogen, and if the ammonia is washed with pure liquid nitrogen, a small amount of inert gas, sulfur dioxide and oxygen content is lower than 20ppm.
So now is the choice of nitrogen machine type is the most PSA nitrogen machine, then what is the principle. First of all, it is in the process of screening, adding carbon molecules, the carbon molecular gas of oxygen and nitrogen adsorption, and the ambient temperature rises, then the whole machine itself, the nitrogen and oxygen separation, can finally obtain high purity nitrogen, but also because its main work is based on the screen, so it be used as a nitrogen for molecular sieve.
Pure nitrogen can not be painted directly, mainly using air separation method. Including: low temperature air separation, PSA (PSA), membrane separation. Now the nitrogen is mainly used in industrial gas business, large, there are a lot of machine manufacturers are also in the production of nitrogen and nitrogen, as long as the production will be nitrogen machine professional, although the state has developed the production of machine manufacturers nitrogen. Low temperature nitrogen because it is in use, the equipment is complex, and the area is large, so now is not the mainstream equipment, therefore, molecular sieve nitrogen in the air is very mature, especially in the top of it is very convenient to use, automatic operation can be achieved, at the same time it the area is relatively small, the operation cost is greatly reduced.
