A liquid nitrogen tank is a specialized equipment used for storing and transporting liquid nitrogen. Its main function is to maintain the low temperature of liquid nitrogen and prevent its evaporation. The design and structure of liquid nitrogen tanks directly affect their performance and safety, and double-layer design is one of their key technologies. By understanding the double-layer structure design of liquid nitrogen tanks, we can better understand their important role in low-temperature storage.

 

1. Basic principles of double-layer design

A liquid nitrogen tank usually consists of two layers, the inner layer is used to store liquid nitrogen, and the outer layer serves as insulation and protection. The space between the inner and outer layers is usually a vacuum layer. The presence of a vacuum layer can effectively reduce heat conduction, thereby preventing external temperature from entering the interior of the liquid nitrogen tank and maintaining the low temperature state of the liquid nitrogen inside the tank.

 

2. The function of vacuum insulation layer

In double-layer design, the vacuum layer is the most critical part. The temperature of liquid nitrogen is extremely low (-196 ℃), while the external environment is usually warm, so liquid nitrogen tanks require an effective insulation system to prevent heat transfer. If there is no vacuum layer, external heat will quickly transfer to the liquid nitrogen tank, causing the temperature of the liquid nitrogen to rise and leading to rapid evaporation, wasting a lot of energy.

 

The vacuum layer significantly reduces thermal conductivity, reduces the entry of external heat, and delays the evaporation process of liquid nitrogen. At the same time, the metal material on the outer layer of the liquid nitrogen tank (such as aluminum or stainless steel) can reflect a portion of the radiant heat, thereby further enhancing the insulation effect.

 

3. Enhance the strength and safety of the tank body

The double-layer design of liquid nitrogen tanks not only has advantages in insulation, but also enhances the strength and safety of the tank body. The structural design of the inner and outer layers can effectively share the external impact and pressure on the tank, reducing the risk of liquid nitrogen tank rupture or damage.

 

In addition, the outer layer of the liquid nitrogen tank can also prevent liquid nitrogen from leaking due to minor collisions or drops. The outer layer of liquid nitrogen tanks is usually made of high-strength materials, which have good seismic and impact resistance, further ensuring the safety of liquid nitrogen tanks during transportation and storage.

 

4. Reduce energy consumption and extend usage time

Due to the effective isolation of internal and external temperature differences by the vacuum layer, the liquid nitrogen tank can maintain liquid nitrogen at a low temperature for a longer period of time. This can not only reduce the speed of liquid nitrogen evaporation, but also decrease the frequency of liquid nitrogen replenishment and improve usage efficiency. For laboratories and industrial production sites that require a large amount of liquid nitrogen, saving liquid nitrogen consumption can undoubtedly reduce operating costs.

 

5. Prevent external pollution

The double-layer design of the liquid nitrogen tank also has the function of preventing external pollutants from entering. Due to the sealed space between the inner and outer layers of the liquid nitrogen tank, external pollutants such as dust and bacteria cannot easily enter the tank, which is particularly important for some biopharmaceutical research and medical applications that require a sterile environment.

 

conclusion

The double-layer design of liquid nitrogen tanks is not only to improve their storage efficiency, but also to ensure safety and reliability during use. By designing a vacuum insulation layer, the liquid nitrogen tank can ensure low-temperature storage while reducing energy consumption, minimizing evaporation losses, and enhancing the structural strength and safety of the equipment. Therefore, the double-layer design is one of the core technologies that liquid nitrogen tanks can be widely used in various fields such as laboratories, industry, and healthcare.