Bottom price Liquid Nitrogen Plant - High purity nitrogen generator manufacturer – LDH

High purity nitrogen generator manufacturer

Compared with the traditional method, the nitrogen making machine produced by our company has the advantages of simple process, high automation, fast gas production (15-30 minutes), low energy consumption, adjustable in a large range according to the user’s needs, convenient operation and maintenance, low operation cost, strong equipment adaptability, etc., and is competitive. More and more nitrogen making machines produced by our company are used for small and medium-sized nitrogen Welcome.

High purity nitrogen generator manufacturer

The nitrogen generator adopts the most simplified planning concept, reducing the moving parts, reducing the possible defects, reducing the corresponding maintenance work, multi-functional monitoring system, completing the online full screen display of gas flow, purity and pressure, prompting the fault alarm and maintaining the nitrogen generator with air as raw material, using the carbon molecular sieve adsorption and pressure swing adsorption principle, selectively adsorbing oxygen and nitrogen, nitrogen and The use of oxygen is the separation of carbon molecules.

 

Our company has been engaged in the field of air separation for 15 years. In the production process, we take a very strict approach. From the planning of equipment appearance to the processing process, we not only ensure the beautiful and excellent workmanship of the equipment, but also make the parameters of the equipment can be maintained for a long time, and can operate stably for a long time, which has been recognized by our customers.

制氧机图3_gaitubao_505x379流程图2_gaitubao_501x287

Basic knowledge

 

1. Gas knowledge as the most abundant gas in the air, nitrogen is inexhaustible. It is colorless, tasteless and transparent. It belongs to sub inert gas and does not maintain life. High purity nitrogen is often used as a protective gas to block oxygen or air. The content of nitrogen (N2) in the air is 78.084% (the volume components of various gases in the air are: N2: 78.084%, O2: 20.9476%, argon: 0.9364%, CO2: 0.0314%, and others are H2, CH4, N2O, O3, SO2, NO2, etc., but the content is very small), the molecular weight is 28, the boiling point is: – 195.8, and the condensation point is: – 210. 2. Pressure common sense PSA nitrogen production process is pressure adsorption, atmospheric desorption, it is necessary to use compressed air. The current adsorbent, carbon molecular sieve, has an adsorption pressure of 0.75-0.9mpa. The gas in the whole nitrogen production system is pressurized and has impact energy.

流程示意

2、 PSA nitrogen making principle: PSA nitrogen making machine is an automatic equipment that takes carbon molecular sieve as adsorbent, uses the principle of pressure adsorption and pressure reduction desorption to absorb and release oxygen from the air, and then separate nitrogen. Carbon molecular sieve is a kind of columnar granular adsorbent which is made of coal, grinded, oxidized, shaped, carbonized and processed by special pass treatment process. Its surface and interior are covered with micropores, and it is black. Its pore distribution is shown in the figure below: the pore size distribution characteristics of carbon molecular sieve enable it to complete the dynamic separation of O2 and N2. Such pore size dispersion can make different gases disperse into the pores of molecular sieves at different rates without repelling any kind of gas in the mixture (air). The separation effect of carbon molecular sieve on O2 and N2 is based on the small difference of the kinetic diameter of the two gases. The kinetic diameter of O2 is smaller, so there is a faster dispersion rate in the micropores of carbon molecular sieve, and the kinetic diameter of N2 is larger, so the dispersion rate is slower. The dispersion of water and CO2 in compressed air is similar to that of oxygen, but that of argon is slow. Finally, the mixture of N2 and AR is enriched from the adsorption tower. The adsorption characteristics of carbon molecular sieve to O2 and N2 can be directly shown by the equilibrium adsorption curve and dynamic adsorption curve. From these two adsorption curves, it can be seen that the addition of adsorption pressure can increase the adsorption capacity of O2 and N2 together, and the fluctuation of the addition of O2 is larger. The cycle of PSA is short, and the adsorption capacity of O2 and N2 is far from the equilibrium (maximum). Therefore, the different dispersion rates of O2 and N2 make the adsorption capacity of O2 greatly exceed that of N2 in a short time. Pressure swing adsorption is to use the selective adsorption characteristics of carbon molecular sieve to produce nitrogen. The cycle of pressure adsorption and pressure reduction desorption is adopted to make the compressed air alternately enter the adsorption tower (or single tower completion) to complete the air separation, and then continuously produce high-purity product nitrogen.

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3、 Basic process flow of PSA nitrogen generation: schematic diagram of basic process flow of PSA nitrogen generation machine air enters into air storage tank after being compressed by air compressor, dedusted, degreased and dried, enters into left adsorption tower through air inlet valve and left suction valve, the pressure of tower increases, oxygen molecules in compressed air are adsorbed by carbon molecular sieve, and non adsorbed nitrogen passes through adsorption bed and left suction valve . the nitrogen production valve enters the nitrogen storage tank. This process is called left suction and lasts for tens of seconds. After the completion of the left absorption process, the left absorption tower and the right absorption tower are connected through the upper and lower pressure equalizing valves to make the pressure of the two towers reach equilibrium. This process is called pressure equalizing and lasts for seconds. After pressure equalizing, the compressed air enters the right adsorption tower through the air inlet valve and the right suction valve. The oxygen molecules in the compressed air are adsorbed by the carbon molecular sieve, and the enriched nitrogen enters the nitrogen storage tank through the right suction valve and the nitrogen production valve. This process is called right suction and lasts for tens of seconds. The oxygen adsorbed by the carbon molecular sieve in the left adsorption tower is released back to the atmosphere through the pressure reduction of the left exhaust valve, which is called desorption. On the contrary, when the left tower is adsorbed, the right tower is desorbed together. In order to completely discharge the oxygen released by Depressurization in molecular sieve into the atmosphere, nitrogen is blown out of the desorption adsorption tower through a normally open back purge valve, and the oxygen in the tower is blown out of the adsorption tower.

 


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