The insulation technology of liquid nitrogen tank: the secret of ultra long insulation time

The key to maintaining the low-temperature state of liquid nitrogen (-196 ℃) for a long time in liquid nitrogen tanks lies in their efficient insulation technology. This technology not only reduces the evaporation loss of liquid nitrogen, but also extends its service life and improves storage efficiency. So, how does the liquid nitrogen tank achieve ultra long insulation?

1. Vacuum insulation layer: reduces heat conduction

The liquid nitrogen tank adopts a double-layer structure design, forming a high vacuum insulation layer between the inner and outer tanks. The main function of the vacuum layer is to prevent air convection and heat conduction, thereby minimizing the entry of external heat into the tank. This technology is similar to the vacuum layer of a thermos, but the vacuum requirements for liquid nitrogen tanks are higher to ensure stable low-temperature environments.

2. Multi layer insulation material: blocks thermal radiation

In order to further reduce the impact of heat, multiple layers of insulation barriers, such as aluminum foil or ultrafine glass fiber materials, are usually added to the vacuum layer of the liquid nitrogen tank. These materials can effectively reflect external thermal radiation, prevent the temperature inside the tank from rising, and thus maintain long-term storage of liquid nitrogen.

3. High strength materials: reduce heat transfer efficiency

The tank body of liquid nitrogen tank is usually made of aluminum alloy or stainless steel, which not only has excellent low-temperature resistance, but also reduces the heat transfer rate. Aluminum alloy is commonly used in small liquid nitrogen tanks due to its low thermal conductivity and lightweight characteristics, while stainless steel is more suitable for large liquid nitrogen tanks that require high-strength structures.

4. Sealing design: reduce evaporation loss

The sealing cover and valve design of liquid nitrogen tanks are also crucial. A high-quality sealing system can reduce the evaporation loss of liquid nitrogen, ensure stable pressure inside the tank, and avoid affecting the low-temperature environment due to the entry of external air. In addition, some liquid nitrogen tanks are equipped with automatic pressure relief valves to prevent excessive internal pressure from affecting the insulation effect.

conclusion

The ultra long insulation time of liquid nitrogen tanks relies on the combination of vacuum insulation, multi-layer insulation barriers, high-strength materials, and precision sealing systems. These advanced insulation technologies enable liquid nitrogen to maintain a low temperature for a long time, thus meeting various application needs in laboratory, medical, industrial and other fields. Understanding the insulation technology of liquid nitrogen tanks is crucial when selecting them. A high-quality insulation system can significantly reduce liquid nitrogen consumption and improve usage efficiency.