LNG storage tank manufacturers introduce the cold insulation design of LNG storage tanks

　　The purpose of the cold insulation design of LNG storage tanks is to meet the requirements of process production, maintain and exert production capacity, reduce cold loss, the cold insulation structure of low-temperature storage tanks, the first consideration is the cold and thermal insulation of the stored cryogenic liquid, and different storage conditions are used differently. The structure and insulation materials.

　　Regarding the cold insulation design of the upper part of the water tank, since the cold insulation material covers the ceiling of the inner water tank, it does not need to be subjected to the pressure of the equipment and the evaporation gas (only the weight of the insulation material itself), and the cold insulation material needs to have the characteristics of low thermal conductivity and low density , The upper part of the low-temperature natural gas tank is made of glass wool with a cold insulation thickness of 500mm. It is installed in five layers. The outer side of the upper glass wool is plated with aluminum foil to prevent expanded perlite and other impurities from entering the inner tank through the gap.

　　Because the inner and outer wall sandwiches choose expanded perlite as the cold insulation material, and the sidewalls use expanded perlite for cold insulation. After the tank filled with low-temperature liquid is cooled, when the inner tank shrinks, the upper part of the tank side wall and the surrounding area are not filled with expanded pearlite. Expanded pearlite cannot be refilled after pre-cooling. In order to prevent the intrusion of moist air, the method of adding elastic thermal insulation glass wool felt on the outer wall of the water tank can avoid the secondary filling of pearlite and reduce the pressure on the water tank wall in the pearlite.

　　The cold insulation material and cold insulation structure at the bottom of the LNG storage tank not only reduce the cold loss of the storage tank, but the compressive strength of the cold insulation material can also withstand the total weight and gas pressure of the internal storage tank and cryogenic liquid. In the design and construction of the oil storage tank, according to the pressure difference at the bottom of the oil storage tank and the principle of greatly reducing the freezing loss rate, the bottom heat insulation structure is divided into two parts, the pressure ring and the center ring, and different cold insulation materials are used. The wheel is the main component affected by the weight of the inner tank, and its strength requirements are relatively high. Therefore, the cold insulation material of the pressure wheel adopts a composite structure of concrete and glass bricks. For the central part of the bottom, the glass brick alone can meet the design requirements of strength and cold insulation.

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