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There are three types in the industry, namely cryogenic air separation, molecular sieve air separation (PSA) and membrane air separation.
A cryogenic air separation nitrogen production Cryogenic air separation nitrogen production is a traditional nitrogen production method, which has a history of nearly several decades. It uses air as a raw material, is compressed, purified, and then uses heat exchange to liquefy air into liquid air. The liquid air is mainly a mixture of liquid oxygen and liquid nitrogen, which has different boiling points of liquid oxygen and liquid nitrogen (the boiling point of the former is -183 ° C at 1 atm, and the latter is -196 ° C), and the distillation through liquid air Separate them to obtain nitrogen. The cryogenic air separation nitrogen production equipment is complex, covers a large area, has a high capital cost, and has a large investment in equipment, high operating cost, low gas production (12 to 24 hours), high installation requirements and long cycle. Comprehensive equipment, installation and infrastructure factors, equipment below 3500Nm3 / h, the investment size of PSA equipment of the same specifications is 20% ~ 50% lower than the cryogenic air separation unit. The cryogenic air separation nitrogen plant is suitable for large-scale industrial nitrogen production, while the medium and small scale nitrogen production is uneconomical.
B molecular sieve air separation nitrogen production method using air as raw material, carbon molecular sieve as adsorbent, using pressure swing adsorption principle, using carbon molecular sieve for selective adsorption of oxygen and nitrogen to separate nitrogen and oxygen, commonly known as PSA nitrogen production. This method is a new nitrogen-producing technology that was rapidly developed in the 1970s. Compared with the traditional nitrogen production method, it has simple process, high degree of automation, fast gas production (15 to 30 minutes), low energy consumption, product purity can be adjusted according to user needs in a wide range, easy operation and maintenance, operation Low cost and strong adaptability of the device, so it is competitive in nitrogen production equipment below 1000Nm3/h. It is more and more popular among small and medium-sized nitrogen users. PSA nitrogen has become the first choice for medium and small nitrogen users. method.
C film air separation nitrogen is based on air. Under certain pressure conditions, gases with different properties such as oxygen and nitrogen have different permeation rates in the membrane to separate oxygen and nitrogen. Compared with other nitrogen-making equipment, it has the advantages of simpler structure, smaller volume, no switching valve, less maintenance, faster gas production (≤3 minutes), convenient capacity increase, etc. It is especially suitable for nitrogen purity ≤ 98% of medium and small nitrogen users have a good price ratio. When the purity of nitrogen is above 98%, it is 15% higher than the PSA nitrogen generator of the same specification.
Nitrogen generator working principle
Using air as a raw material, l is obtained by separating the oxygen and nitrogen therein by a physical method.