Nitrogen Generating Device

Nitrogen generating device

This method uses air as raw material, uses carbon molecular sieve as the adsorbent, uses the principle of pressure swing adsorption, and utilizes the selective adsorption of oxygen and nitrogen by carbon molecular sieve to separate nitrogen and oxygen. It is commonly known as PSA nitrogen production. This method is a new nitrogen production technology that developed rapidly in the 1970s.

There are three types in industry, namely cryogenic air separation, molecular sieve air separation (PSA) and membrane air separation.
Cryogenic air separation nitrogen production
Cryogenic air separation nitrogen production is a traditional nitrogen production method with a history of several decades. It uses air as raw material, compresses and purifies it, and then uses heat exchange to liquefy the air into liquid air. Liquid air is mainly a mixture of liquid oxygen and liquid nitrogen. Taking advantage of 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 , causing them to separate to obtain nitrogen. Cryogenic air separation nitrogen production equipment is complex, covers a large area, has high infrastructure costs, high one-time investment in equipment, high operating costs, slow gas production (12 to 24 hours), high installation requirements, and long cycle. Taking into account equipment, installation and infrastructure factors, the investment scale of PSA equipment with the same specifications for equipment below 3500Nm3/h is 20% to 50% lower than that of cryogenic air separation equipment. Cryogenic air separation nitrogen production equipment is suitable for large-scale industrial nitrogen production, but medium and small-scale nitrogen production is uneconomical.
Molecular sieve air separation nitrogen production
Compared with the traditional nitrogen production method, it has the advantages of simple process flow, high degree of automation, fast gas production (15 to 30 minutes), low energy consumption, product purity can be adjusted within a wide range according to user needs, easy operation and maintenance, and fast operation. It has the characteristics of low cost and strong device adaptability, so it is quite competitive among nitrogen production equipment below 1000Nm3/h. It is increasingly welcomed by medium and small nitrogen users. PSA nitrogen production has become the first choice of medium and small nitrogen users. method.
Membrane air separation nitrogen production
Using air as raw material, under certain pressure conditions, gases with different properties such as oxygen and nitrogen have different permeability rates in the membrane to separate oxygen and nitrogen. Compared with other nitrogen-generating equipment, it has the advantages of simpler structure, smaller volume, no switching valves, 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 function-price ratio. When the nitrogen purity is above 98%, its price is more than 15% higher than that of PSA nitrogen making equipment of the same specification.