Understanding the material of liquid nitrogen quick freezing

2020-07-23 10:48:43

Under normal circumstances, liquid nitrogen quick-freezing material nitrogen is inactive. When heated to very high temperatures, it reacts with more active metals such as lithium and magnesium to form nitrides. It also reacts with oxygen to form nitrogen oxides, and when a catalyst is present, it reacts with hydrogen to form ammonia.

Since nitrogen is not corrosive, no special building materials are required. However, the selected building materials must be able to withstand the low temperature of liquid nitrogen. The container and piping system should be designed according to the relevant pressure and temperature in accordance with the standards of the relevant national agencies or the regulations of the Ministry of Transport.

Although it is usually used as a gas, nitrogen is generally stored and transported in a liquid state, so that the cost of product supply is lower.

When nitrogen turns into a liquid state, it becomes a cryogenic liquid. Cryogenic liquid is a liquefied gas with a boiling temperature generally below -238°F (-150°C). The boiling point of liquid nitrogen is -320.5°F (-195.8°C). Because the temperature difference between the product and the surrounding environment is very large even in winter, it is important to keep the liquid nitrogen from the surrounding environment. The product also requires specialized use and storage equipment.

A typical storage system consists of a low-temperature storage tank, one or more vaporizers, a pressure control system and all piping systems for filling, vaporization, and supply. The cryogenic tank is made like a vacuum flask. It is designed so that heat cannot enter the liquid nitrogen in the inner tank. The vaporizer converts liquid nitrogen into a gaseous state. The pressure control tube controls the gas pressure input to the process. The process of using liquid nitrogen does not require a vaporizer and pressure control tube.

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