Pressure swing adsorption nitrogen production
uses air as the raw material, carbon molecular sieve as the adsorbent, using the principle of pressure swing adsorption, the use of carbon molecular sieve to selectively adsorb oxygen and nitrogen to separate nitrogen and oxygen, commonly known as PSA nitrogen. This method is a new nitrogen production technology that developed rapidly in the 1970s. Compared with the traditional nitrogen production method, it has the advantages of simple process flow, high degree of automation, fast gas production (15-30 minutes), low energy consumption, product purity can be adjusted in a larger range according to user needs, operation and maintenance are convenient, and operation With the characteristics of low cost and strong adaptability, it is quite competitive in nitrogen production equipment below 1000Nm3/h, and is more and more popular with small and medium nitrogen users. PSA nitrogen production has become the first choice for small and medium nitrogen users. method.
Cryogenic Air Separation Nitrogen
Cryogenic nitrogen production by air separation is a traditional nitrogen production method with a history of several decades. It uses air as raw material, compressed and purified, and then uses heat exchange to liquefy the air into liquid air. Air Liquide is mainly a mixture of liquid oxygen and liquid nitrogen, using the different boiling points of liquid oxygen and liquid nitrogen (at 1 atmosphere, the boiling point of the former is -183°C, and the latter is -196°C), through the rectification of Liquid Air , Separate them to obtain nitrogen. Cryogenic air separation nitrogen production equipment is complex, covers a large area, high infrastructure costs, more one-time equipment investment, high operating costs, slow gas production (12-24h), high installation requirements, and a long cycle. Comprehensive equipment, installation and infrastructure factors, equipment below 3500Nm3/h, the investment scale of the PSA device of the same specification is 20%-50% lower than that of the cryogenic air separation device. Cryogenic air separation nitrogen production equipment is suitable for large-scale industrial nitrogen production, while medium and small-scale nitrogen production is uneconomical.
Membrane Air Separation Nitrogen Production
Using air as the raw material, under certain pressure conditions, the use of oxygen and nitrogen and other gases with different properties in the membrane have different permeation rates to separate oxygen and nitrogen. Compared with other nitrogen production equipment, it has the advantages of simpler structure, smaller volume, no switching valve, less maintenance, faster gas production (≤3 minutes), and convenient capacity expansion. It is especially suitable for nitrogen purity ≤ 98% of medium and small nitrogen users have the best price-to-function ratio. When the nitrogen purity is above 98%, its price is more than 15% higher than the PSA nitrogen generator of the same specification.