What are the characteristics of laboratory liquid nitrogen generators?

　　Laboratory Liquid Nitrogen GeneratorIt is a device that uses compressed air as a raw material, utilizing an adsorbent called a carbon molecular sieve to selectively adsorb nitrogen and oxygen, separating nitrogen from the air. Depending on the classification method, they are low-temperature air separation, pressure swing adsorption (PSA) nitrogen generation, and membrane air separation.

　　Technically, the laboratory liquid nitrogen generator is a nitrogen generation equipment designed and manufactured based on pressure swing adsorption technology. It uses imported carbon molecular sieve (CMS) as an adsorbent and employs the pressure swing adsorption (PSA) principle at room temperature to separate air and produce high-purity nitrogen. Usually, two adsorption towers are connected in parallel, and an imported PLC controls the automatic operation of the air-operated valves. They alternately perform pressure adsorption and pressure reduction regeneration to complete nitrogen-oxygen separation and obtain the required high-purity nitrogen.

　　In the workflow, the laboratory liquid nitrogen generator compresses air using an air compressor, which then enters a freeze dryer for freeze-drying to meet the dew point requirements of the pressure swing adsorption nitrogen generation system for raw air. Then, the oil and water in the raw air are removed by a filter, and the raw air enters the air buffer tank to reduce pressure fluctuations. After that, the pressure is adjusted to the rated operating pressure through a pressure regulating valve and sent to two adsorbers (containing carbon molecular sieves) to separate the air and produce nitrogen. Raw material enters one adsorber to produce nitrogen; the other adsorber is depressurized, desorbed, and regenerated. The two adsorbers work alternately, continuously supplying raw air and continuously producing nitrogen. The nitrogen is sent to a nitrogen buffer tank, and the pressure is adjusted to the rated pressure through a pressure regulating valve; it is measured using a flow meter, analyzed and detected using a nitrogen analyzer, with qualified nitrogen retained and unqualified nitrogen vented (when the nitrogen generator starts).

　　The laboratory liquid nitrogen generator is convenient and fast. Due to its advanced technology and unique airflow distributor, the airflow distribution is more uniform. The carbon molecular sieve is fully utilized, and qualified nitrogen can be provided in about 20 minutes. It is easy to use, with a compact structure, overall skid mounting, small footprint, no need for infrastructure investment, low investment, and only requires connecting to the power supply to produce nitrogen on-site; compared with other nitrogen supply methods, the pressure swing adsorption process is a simple nitrogen generation method, using air as a raw material, its energy consumption is only the electricity consumed by the air compressor, with the advantages of low operating cost, low energy consumption, and high efficiency. With the advancement of automation technology, the nitrogen generator is designed according to the principle of mechatronics to achieve automated operation, that is, imported PLC control fully automatic operation, nitrogen flow rate and pressure purity are adjustable and continuously displayed, and unattended operation can be achieved.

　　In the pharmaceutical industry, the requirements for medical nitrogen are very high, requiring high purity. The difference between a medical nitrogen generator and other nitrogen generation equipment lies in the fact that, due to the international GMP standard of the pharmaceutical industry, parts that come into contact with drugs or drug solutions are made of stainless steel and have sterilization requirements. The equipment needs to be made of stainless steel, and a sterilization filter is installed at the nitrogen outlet of the equipment. Also, because pharmaceutical companies have high overall requirements for equipment, there are generally configurations. It is understood that with the improvement of GMP standards, many pharmaceutical machinery industries have also made efforts in this area, and many pharmaceutical-grade high-purity nitrogen generators that meet the standards have appeared on the market. Medical high-purity nitrogen generators are suitable for the food and pharmaceutical industries, water injections, powder injections, large-volume infusion drugs, and biochemical and isolation nitrogen supply equipment. They are mainly composed of three systems: a compressed air post-processing system, a PSA pressure swing adsorption system, and a gas precision filtration and sterilization system.