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KDN type high-purity nitrogen air separation equipment

Deep cooling nitrogen production can not only produce nitrogen but also liquid nitrogen. Satisfying the process requirements for liquid nitrogen, it can also be stored in a liquid nitrogen storage tank. When there is an intermittent load of nitrogen or a minor repair of the air separation equipment, the liquid nitrogen in the storage tank enters the vaporizer and is heated before being sent to the product nitrogen pipeline to meet the nitrogen demand of the process unit. The operating cycle of cryogenic nitrogen production (referring to the interval between two large heating cycles) is generally more than 1 year, therefore, cryogenic nitrogen production generally does not consider backup. Cryogenic nitrogen production can produce nitrogen with a purity of ≥ 99.999%. The purity of nitrogen is limited by the nitrogen load, number of trays, tray efficiency, and oxygen purity in the liquid air, with a small adjustment range. Therefore, for a set of cryogenic nitrogen production equipment, the product purity is basically certain, which is inconvenient to adjust. When the adsorber is absorbed to a certain extent, the adsorbent in it will reach a saturated state. At this time, a vacuum pump is used to vacuum the adsorber through the switching valve (opposite to the adsorption direction), and the vacuum degree is 0.65-0.75barg. The absorbed water, carbon dioxide, nitrogen and a small amount of other gas components are pumped out to the atmosphere and the adsorbent is regenerated.

Key words:

Cryogenic Air Separation Equipment

Classification:

Cryogenic Air Separation Equipment

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