Introduction to knowledge related to laboratory liquid nitrogen machines

　　Laboratory Liquid Nitrogen GeneratorIt uses a single compressor-driven cryogenic mixed refrigerant throttling refrigeration unit with pre-cooling to achieve nitrogen liquefaction (-180). The deep mixed refrigerant throttling refrigeration unit is based on a heat recovery multi-component mixed refrigerant throttling refrigeration cycle. From ambient temperature to the target refrigeration temperature, high, medium, and low boiling point pure components form a multi-component mixed refrigerant, achieving effective relay matching of the refrigeration temperature zones of each boiling point component. It is a refrigerator that can achieve a temperature range of -40~-196. The advantages of this product are: it can use mature commercially available compressors, heat exchangers, and other equipment on the market; high liquefaction efficiency, high reliability, maintenance-free, and long service life. This machine has the characteristics of simple process flow, room temperature production, high degree of automation, convenient start and stop, few wearing parts, easy maintenance, and low production cost.

　　Technical Features of the Laboratory Liquid Nitrogen Generator:

　　1. Low energy consumption, stable performance, strong adaptability, fast gas production, adjustable output and purity.

　　2. Overall skid-mounted structure design, convenient installation and operation, small footprint.

　　3. Simple operation, intelligent control, unmanned operation.

　　4. Honeycomb composite bed constant flow diffusion technology, constant airflow, ensuring the adsorption efficiency of the molecular sieve.

　　5. Special pressure protection device, extending the service life of the carbon molecular sieve.

　　6. Uses Brand pneumatic valves to ensure continuous operation of the equipment.

　　7. Automatic venting device for unqualified nitrogen, ensuring the quality of finished nitrogen.

　　8. Multiple fault diagnosis, alarm, and handling functions.

　　9. Optional touch screen human-machine interface, adaptive energy-saving control, dew point detection, DCS communication, etc.

　　During long-term use of the laboratory liquid nitrogen generator, maintenance should be carried out to extend the service life of the equipment. The maintenance methods are briefly introduced below:

　　1. The carbon molecular sieve is the core of the small liquid nitrogen equipment. In order to prevent it from being polluted and losing its function, it is necessary to strictly control the oil content of the air compressor exhaust gas and regularly replace the filter element of the precision filter and the activated carbon in the high-efficiency oil remover.

　　2. When a small liquid nitrogen machine is running, if a large amount of black dust is sprayed from the exhaust port of the silencer, the machine should be stopped immediately to find out the cause to prevent more serious pulverization of the carbon molecular sieve.

　　3. Regularly check the pressure gauge of the compression cylinder. If there is no pressure or pressure drop during desorption, it indicates that the cylinder cannot compress the carbon molecular sieve normally. The fault should be eliminated in time to prevent the carbon molecular sieve from pulverizing due to movement without being compressed. When a carbon position alarm occurs due to gap reorganization or normal loss of carbon molecular sieve, adding carbon molecular sieve must be stopped immediately. The storage, transportation, and loading and unloading of carbon molecular sieve will not harm the human body. Safety glasses, respiratory filters, and exhaust fans can be worn when filling carbon molecular sieve. After filling, the skin contact area should be washed with soap.