Liquid nitrogen produced by small liquid nitrogen generator is often used for low-temperature storage. The liquid nitrogen preservation method mainly uses the principle that the metabolism of microorganisms tends to stop at a low temperature below – 130 ° C, and effectively preserves the bacteria in liquid nitrogen (- 196 ° C ultra-low temperature). This method is simple and efficient, and the preservation period can generally reach more than 15 years.

PSA oxygen production low temperature small liquid nitrogen plant

According to the principle of pressure swing adsorption, the small liquid nitrogen generator uses high-quality carbon molecular sieve as the adsorbent to produce nitrogen from the air under a certain pressure，and the finished gas passes through the refrigerator to produce liquid nitrogen.

Efficient and stable, safe and reliable! Our laboratory small liquid nitrogen machine adopts advanced cold head refrigeration technology, which can freeze dry nitrogen to -196°C and provide reliable low-temperature gas. The product has a number of alarm protection functions to ensure the safety of the equipment during operation. No need for regular maintenance, high reliability and long service life make it an ideal choice. In addition, the intelligent operation of the equipment and fully automatic control operation provide a convenient and reliable solution for laboratory work. Buying our products, you will get the advantage of the structural design, beautiful and durable. Let our small liquid nitrogen machine be your right-hand man in the laboratory!

The Priciple of Small Liquid Nitrogen Generator

The small liquid nitrogen generator plant for low temperature storage uses a kind of adsorbent called carbon molecular sieve to selectively adsorb nitrogen and oxygen to separate nitrogen from the air. The separation from small liquid nitrogen generator plant effect of carbon molecular sieve on nitrogen and oxygen is mainly based on the different diffusion rates of nitrogen and oxygen molecules on the surface of the molecular sieve. The oxygen molecules in small liquid nitrogen generator plant with smaller diameter diffuse faster and enter the solid phase of the molecular sieve more; Nitrogen molecules with larger diameter diffuse slowly and less enter the solid phase of molecular sieve, so nitrogen is enriched in the gas phase.

After a period of time, the adsorption of oxygen on the molecular sieve reaches a certain degree. Through decompression, the gas adsorbed by the carbon molecular sieve is released, and the molecular sieve is regenerated. This is based on the different adsorption capacity of molecular sieves for adsorbed gases under different pressures. Pressure swing adsorption nitrogen production equipment usually uses two parallel adsorbers to alternately perform pressure adsorption and pressure reduction regeneration, with an operation cycle of about 2 minutes.

Using air as raw material and carbon molecular sieve as adsorbent, small liquid nitrogen generator plant for low temperature storage uses the principle of pressure swing adsorption to separate nitrogen and oxygen through the selective adsorption of carbon molecular sieve on oxygen and nitrogen, which is generally called PSA nitrogen production. This method is a new small liquid nitrogen generator plant technology developed rapidly in the 1970s. Compared with the traditional nitrogen production method, it has the characteristics of simple process flow, high automation, fast gas production (15-30 minutes), low energy consumption, product purity can be adjusted in a large range according to the needs of users, convenient operation and maintenance, low operating cost, and strong adaptability of the device. Therefore, it is competitive in the nitrogen production equipment below 1000nm3 / h, and is more and more welcomed by medium and small nitrogen users. The small liquid nitrogen generator plant has become a medium Methods for small nitrogen users.

The Parameteres of Small Liquid Nitrogen Generator 

The Working Diagram of Liquid Nitrogen Generator

A small liquid nitrogen machine employs the basic principle of thermodynamics. It compresses nitrogen gas to a high pressure and lowers its temperature, causing it to liquefy and become available for use in various scientific, industrial, and medical applications.