Introduction: Cold storage of LNG storage tank is one of the key measures to ensure the safe storage and supply of LNG, but cold storage of LNG storage tank has certain particularity and strictness. Why is it important to keep LNG tanks cold? What are the difficulties? We will give you answers in this article.

First, liquefaction is the core of LNG production

The liquefaction of natural gas facilitates the transportation and storage of LNG, and can also improve the energy efficiency of the fuel through the increase in energy density (it is understood that each cubic meter of LNG heat equivalent to about 26 cubic meters of natural gas).

This requires an extremely high and stable storage capacity for LNG. The cooling of LNG storage tank is one of the key measures to ensure the safe storage and long-term supply of LNG.

Second, the importance of cold storage of LNG tanks

Maintain a cold environment: LNG needs to be stored at low temperatures to remain liquid. If the temperature inside the tank is too high, the LNG will quickly vaporize, leading to an increase in pressure inside the tank, which can even cause danger.

Prevent leakage and volatilization: LNG is a flammable and explosive substance, or due to leakage or volatilization cause fire or explosion and other dangerous situations. Therefore, cold protection measures can prevent LNG leakage and volatilization, reducing safety risks.

It can be seen that maintaining a low temperature environment in the storage tank is the key to ensuring the safe storage of LNG.

Prolong the service life of the storage tank: cold protection measures can reduce the corrosion and aging of the inner wall of the storage tank and extend the service life of the storage tank. This is important to ensure the safe storage and long-term supply of LNG.

The importance of LNG storage tank cooling is self-evident, but the current market of LNG storage tank cooling technology still needs to be improved, and there are mainly the following difficulties.

Three, the three difficulties of LNG storage tank cooling

Cold material selection: LNG storage tank needs to ensure the low temperature environment in the storage tank. However, at present, there are many kinds of cold retaining materials on the market with different properties, and selecting the right cold retaining materials has become a major difficulty.

Cold layer construction: The cold layer of the LNG storage tank needs to have sufficient thickness and strength to ensure the low temperature environment and safe use of the storage tank. At the same time, the construction of the cooling layer also needs to take into account the structure and size of the storage tank and other factors to ensure its stability and reliability.

Installation and maintenance of the cold protection layer: The cold protection layer of the LNG storage tank needs to be installed between the inner wall and the outer wall of the storage tank, and its flatness and airtightness should be ensured during installation.

Can we find solutions to these problems in LNG storage and transportation?

Fourth, LNG special elastic felt - cold protection, pressure resistance, stability of multiple guarantees

Natural gas liquefaction is to put the pre-treated natural gas into the heat exchanger for low temperature freezing cycle, and it will liquefy after the temperature of natural gas drops to -162℃.

The fiber of LNG special elastic felt is tightly combined with low thermal conductivity, which can effectively block the infiltration and loss of heat, maintain a low temperature environment, and meet the requirements of low temperature storage and transportation environment of about -160℃.

In addition, the tight bond between the fibers of LNG special elastic felt results in high tensile strength and high resilience of the material. This performance can effectively solve the dual pressure of the LNG storage tank to ensure safe storage and transportation. (The internal pressure is mainly the pressure caused by the evaporation of LNG, while the external pressure is the environmental pressure.) The material and composition of LNG special elastic felt also ensure that the fiber distribution of the product is uniform after installation and use, and there will be no local thickness and insufficient strength.

Finally, the use effect of the product is directly related to the flatness and bonding force during construction and installation. This requires construction personnel to keep the surface of the storage tank smooth and free of impurities, use special adhesive, pay attention to pressing, etc., standardize construction and ensure quality.