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PSA Nitrogen Generator Good Performance And Convenient Maintenance
Oct 23, 2017

PSA Nitrogen Generator is a set of equipment that can extract nitrogen, its main applications are: aerospace, nuclear power, food and medicine, petrochemical, electronic industry, material industry, defense military industry and scientific experiments, and other fields. In order to facilitate the understanding of the status quo, let me introduce some of the PSA Nitrogen Generator principles used in gas chromatographic analysis experiments, for your reference only.

1, electrochemical nitrogen;

2, using hollow fiber membrane separation method;

3, PSA nitrogen production.

The PSA Nitrogen Generator with electrochemical method can be used for producing pure nitrogen and oxygen. It uses the constant potential electrolysis method, uses the microporous membrane (for example asbestos membrane) as the two electrodes separator plate, the porous gas diffusion type oxygen electricity extremely cathode, the nickel net is the anode, and the electrode installment is uses the hard support structure. The generator can work stably under the pressure difference of nitrogen and oxygen Chamber (1MPa), which can avoid the hydrogen separation of cathode and guarantee the purity and nitrogen of gas. The method for producing nitrogen is to feed the gas into an electrolytic cell with an electrolyte, and a voltage ≤1 between the two electrodes. 5V direct current, at which time the oxygen in the air in the trough is absorbed to obtain nitrogen. The electrolyte uses the "forced circulation mode", which is driven by the electromagnetic pump to circulate the electrolyte in the liquid path, which improves the electrolysis efficiency.

This method produces up to 99.995% of the nitrogen, however, there are several obvious defects: first, the need to the high concentration of potassium hydroxide solution for the electrolyte, this strong alkali solution and gas direct contact with the potential impact on the quality of the gas, and the possibility of output with the gas path; second, the unit cost is high, not suitable for large flow PSA Nitrogen Generator Third, the reaction process only removes the oxygen in the air, other impurities are not involved in the gas, and the reaction process to the electrolysis cell production technology requirements are high, improper electrolytic cell production technology will result in the nitrogen purity of the magnitude of the reduction. However, this type of PSA Nitrogen Generator as a small flow of nitrogen sources, is often used for chromatographic gas and small-capacity protection, the total cost of thousands of yuan, is a low-cost solution.

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

When the mixture of gas in the driving force-the film on both sides of the pressure difference, the relatively fast permeability of gas and water, oxygen, carbon dioxide, etc. through the membrane on the permeability side is enriched, and the relatively slow permeability of gas such as nitrogen, carbon monoxide, argon, etc. in the stranded side is enriched, so as to achieve the purpose of mixed gas separation.

When the pressurized air is used as the gas source, the inert gas, such as nitrogen, is enriched and purified for production and application, which is evacuated by the permeable side for oxygen-enriched air. Nitrogen membrane systems can increase the cost of nitrogen from 78% to more than 95% of the cheap air, with a maximum of 99.9% pure nitrogen.

This method of nitrogen production has a lot of application in the industry, and is mainly used in the laboratory to purge, protect and replace oxygen for gas purity. The main advantages of this type of generators are large flow, at the same time 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 costs, instrument prices are relatively high.

The difference of adsorption capacity between nitrogen and other gas molecules in molecular sieve, and the accumulation of concentration difference, produces high purity nitrogen at the end of molecular sieve column. At the same time, using two molecular sieve column, one adsorption at the same time to elicit a part of the product gas for another analysis, the realization of the molecular sieve on-line regeneration, the overall performance of the instrument continues to output high-purity nitrogen.

This type of generator can be based on the need to regulate the purity and flow of nitrogen, the highest production of 99.999% of nitrogen products, flow from hundreds of ml to dozens of liters to a few cubic meters per minute, the size of the configuration flexible, according to each demand specific customization, applicable to a variety of gas chromatograph detector.

As mentioned above, PSA Nitrogen Generators using PSA pressure swing adsorption to nitrogen production are better than the PSA Nitrogen Generators using electrochemical separation method and physical adsorption method and hollow fiber membrane method. It can be used in various types of gas chromatograph 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.