Advantages, characteristics and future trend of modular nitrogen generator

Many customers' understanding of the nitrogen generator market generally stays in the traditional type. Therefore, when introducing the modular nitrogen generator to customers, there will be a big difference in recognition. In particular, many customers who need high-purity nitrogen have doubts and concerns about the production of high-purity nitrogen by the on-site nitrogen generator system, as well as concerns about the subsequent maintenance costs, Even feel that the imported brand of nitrogen generator is necessary to achieve high-purity nitrogen production function.

To solve these doubts, we must first understand the evolution process of the nitrogen generator market and the classification of nitrogen generators:

Membrane nitrogen generation (low purity, small flow)

Traditional nitrogen generator (low and medium purity, medium and large flow)

Modular nitrogen generator (medium and high purity, small and medium flow)

Appearance picture of modular nitrogen generator

About nitrogen

Nitrogen, with the chemical formula of n ɑ, is usually a colorless and odorless gas, and the density of nitrogen is generally smaller than that of air. Nitrogen accounts for 78.08% (volume fraction) of the total atmospheric volume and is one of the main components of air. At standard atmospheric pressure, when nitrogen is cooled to -195.8 ℃, it turns into a colorless liquid. When cooled to -209.8 ℃, liquid nitrogen turns into a snow like solid. Nitrogen is inert chemically and difficult to react with other substances at room temperature, so it is often used to make preservatives. However, under the conditions of high temperature and high energy, it can chemically change with some substances to produce new substances useful to human beings.

Working principle of PSA nitrogen generator

Pressure swing adsorption (PSA) is a new type of gas adsorption and separation technology, which uses carbon molecular sieve adsorbent (carbon molecular sieve is a kind of particles made of pulverized coal through special processing, and its surface is covered with numerous micropores). It uses a two bed PSA device to separate oxygen from the air and separate O2 and N2 in the air, so as to obtain nitrogen. The principle of air separation depends on the different diffusion rates of oxygen and nitrogen in the air in the micropores of carbon molecular sieve. The diffusion rate of oxygen into the micropores of carbon molecular sieve is much faster than that of nitrogen, so that oxygen molecules are adsorbed in the micropores of carbon molecular sieve, while nitrogen molecules are enriched in the gas phase. At the same time, the oxygen adsorption capacity of carbon molecular sieve increases with the increase of its pressure, and decreases with the decrease of its pressure. In this way, the carbon molecular sieve adsorbs when pressurized, desorbs oxygen components under reduced pressure, and forms a circulating operation to achieve the purpose of air separation. Referred to as PSA nitrogen generation.