Nitrogen Generator

A nitrogen generator uses air as raw material and separates oxygen and nitrogen through physical methods.

There are three types in industry, namely cryogenic air separation, molecular sieve air separation (PSA), and membrane air separation.

A cryogenic air separation for nitrogen production

Cryogenic air separation for nitrogen production is a traditional nitrogen production method with a history of nearly several decades. It uses air as raw material, undergoes compression and purification, and then uses heat exchange to liquefy the air into liquid air. Liquid air is mainly a mixture of liquid oxygen and liquid nitrogen. By utilizing the different boiling points of liquid oxygen and liquid nitrogen (at 1 atmosphere, the former has a boiling point of -183 ℃, while the latter has a boiling point of -196 ℃), nitrogen is obtained by separating them through the refinement of liquid air. The cryogenic air separation nitrogen production equipment is complex, occupies a large area, has high infrastructure costs, requires a large one-time investment in equipment, has high operating costs, produces gas slowly (12-24h), has high installation requirements, and has a long cycle. Taking into account factors such as comprehensive equipment, installation, and infrastructure, the investment scale of PSA units with the same specifications for equipment below 3500Nm3/h is 20% lower than that of cryogenic air separation units? 50%. The cryogenic air separation nitrogen production unit is suitable for large-scale industrial nitrogen production, while the medium and small-scale nitrogen production machines appear uneconomical.

B molecular sieve air separation for nitrogen production

The method of using air as raw material, carbon molecular sieve as adsorbent, and pressure swing adsorption principle to selectively adsorb oxygen and nitrogen by carbon molecular sieve to separate nitrogen and oxygen is commonly known as PSA nitrogen production. This method is a new nitrogen production technology that rapidly developed in the 1970s. Compared with traditional nitrogen production methods, it has the advantages of simple process flow, high degree of automation, fast gas production and nitrogen generator (15-30 minutes), low energy consumption, adjustable product purity within a large range according to user needs, easy operation and maintenance, low operating costs, and strong device adaptability. Therefore, it is highly competitive in nitrogen production equipment below 1000Nm3/h. Nitrogen generators are increasingly popular among small and medium-sized nitrogen users, and PSA nitrogen production has become a popular choice for small and medium-sized nitrogen usersmethod

C membrane air separation for nitrogen production

Using air as raw material, under certain pressure conditions, different gases with different properties such as oxygen and nitrogen are used to separate oxygen and nitrogen in the membrane with different permeation rates. Compared with other nitrogen production equipment, it has the advantages of simpler structure, smaller volume, no switching valves, less maintenance, faster gas production (W3 minutes), and convenient capacity expansion. It is particularly suitable for small and medium-sized nitrogen users with a purity of W98%, and has the best functional price ratio. When the purity of nitrogen is above 98%, its price is more than 15% higher compared to PSA nitrogen generators of the same specifications.

Technical characteristics of the series of medicinal high-purity nitrogen generators:

Nitrogen has a wide range of applications in the pharmaceutical industry, such as nitrogen protection and pneumatic transportation in synthetic drugs, pure nitrogen isolation in biotechnology, nitrogen filling and sealing in the production of nitrogen producing agents, and so on. Drug production has high requirements for nitrogen gas:

1) High purity of nitrogen is required, generally reaching 99% 9%? 99.99%, which is the requirement for oxygen free in the national standard;

2) Require nitrogen to be free of dust and heat sources, and can be used for injection sealing;

3) Require nitrogen to maintain a constant pressure supply during the production process to ensure the normal operation of production.

Note: For specific model dimensions of the nitrogen generator, please contact a professional engineer from Lidaheng.