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PSA Nitrogen Generator Excellent Performance, Easy Maintenance
Jun 09, 2017

PSA Nitrogen Generator is a set of equipment to extract nitrogen, its main application areas: aerospace, nuclear nuclear energy, food and medicine, petrochemical, electronics industry, materials industry, national defense and scientific experiments and other fields. In order to understand the status quo, the following I have introduced several applications in the gas chromatography analysis of PSA Nitrogen Generator principle, for your reference.

1, electrochemical method of nitrogen;

2, using hollow fiber membrane separation method;

3, PSA pressure swing adsorption nitrogen.

1 electrochemical method of nitrogen (need to "add liquid")

The use of electrochemical method of PSA Nitrogen Generator can be made of pure nitrogen, oxygen and other gases. It uses a constant potential electrolysis method, the use of microporous membrane (such as asbestos film) as the separation of the two electrodes, porous gas diffusion electrode for the cathode, nickel mesh for the anode, and the electrode is installed using a hard support structure. The generator can be nitrogen, oxygen chamber pressure (1MPa) under the stable operation, to avoid cathodic hydrogen precipitation, to ensure that the purity of nitrogen gas. The specific method of making nitrogen is to feed the gas into the electrolytic cell with air as the raw material. Between the two electrodes, the DC voltage of ≤ 1.5V is added, and oxygen is absorbed in the air in the tank to obtain nitrogen. The electrolyte with "forced circulation" by the electromagnetic pump to promote the electrolyte in the liquid circuit in circulation, improve the electrolysis efficiency.

This method can produce up to 99.995% of the nitrogen, but there are several obvious defects: First, the need to use a high concentration of potassium hydroxide solution as electrolyte, this strong alkali solution and gas in direct contact with the gas quality The second part of the unit cost is high, not suitable for large flow of PSA Nitrogen Generator; Third, the reaction process only to remove the oxygen in the air, other impurities are not involved in the gas, and the other The reaction process of the electrolytic cell production technology requirements are high, inappropriate electrolysis cell production technology will result in the order of nitrogen purity grade reduction. However, such PSA Nitrogen Generators, as a source of small flow of nitrogen, are often used for chromatographic carrier gas and small capacity protection, the total cost of a few thousand dollars, is a low-cost solution.

2Using hollow fiber membrane method (no "plus liquid")

When two or more gases are mixed through the polymer membrane, the relative permeation rate of the different gases in the membrane is different due to the difference in solubility and diffusion coefficient of the various gases in the membrane. According to this feature, the gas can be divided into "fast" and "slow gas".

When the mixed gas in the driving force - both sides of the pressure on the membrane under the action of the relatively high penetration rate of gas and water, oxygen, carbon dioxide and other membrane through the membrane after the infiltration side is rich, and the infiltration rate is relatively slow Gas such as nitrogen, carbon monoxide, argon, etc. are concentrated in the retention side, so as to achieve the purpose of mixed gas separation.

When pressurized air is used as the gas source, an inert gas such as nitrogen is enriched into a high purity for production applications, and oxygen-enriched air is emptied from the permeate side. Nitrogen film system can be low in the air from 78% to 95%, up to 99.9% of the pure nitrogen.

This method of nitrogen separation of membrane nitrogen in the industry has a lot of applications in the laboratory is mainly used for gas purity requirements are not particularly high purge, protection, replacement of oxygen and so on. The main advantages of this type of generator is the flow of large, while long life, and maintenance costs are very low; the disadvantage is that nitrogen purity can not achieve high purity, membrane components are currently imported, domestic can not provide higher cost, instrument prices are relatively high.

3PSA pressure swing adsorption nitrogen (no "plus liquid")

The use of nitrogen and other gas molecules in the molecular sieve adsorption capacity difference, the formation of the concentration of the accumulation of different concentrations in the molecular sieve column output of high purity nitrogen. At the same time the use of two molecular sieve column, a suction at the same time leads to a part of the product gas for another analysis, to achieve molecular sieve online regeneration, the overall performance of the instrument is continuous output of high purity nitrogen.

This type of generator can adjust the purity and flow rate of nitrogen according to the need, the maximum production of 99.999% of the nitrogen product, the flow can be from several hundred milliliters to tens of liters to several cubic feet per minute, the purity of the configuration flexibility, according to each demand Customized for a wide range of gas chromatograph detectors.

As mentioned above, PSA Nitrogen Generators using PSA PSA are superior to PSA Nitrogen Generators using electrochemical separation and physical adsorption as well as hollow fiber membranes. It can be used in a variety of different types of gas chromatography at home and abroad as a carrier gas, is a good performance, easy maintenance of a new generation of PSA Nitrogen Generator, with the world's leading level.