LNG cryogenic storage tank introduction

In recent years, the cryogenic liquid market has become increasingly prosperous. The sales of liquid oxygen, liquid argon, liquid nitrogen, liquid carbon dioxide and LNG natural gas have increased significantly. Therefore, the profit of the oxygen generator by-product is very considerable, and it has become an important part of the steel industry's non-steel product revenue. The production, storage and transportation of cryogenic liquids are inseparable from the thermal insulation storage tanks, and they are installed and used in large quantities.

 Low-temperature storage tanks are divided into vacuum powder insulation type and atmospheric pressure powder insulation type, powder insulation, using low thermal conductivity powder, fiber or foam to reduce heat transfer. Atmospheric pressure powder insulation is the application of ordinary powder insulation (packaging insulation) at atmospheric pressure, thick insulation layer, and filled with dry nitrogen to maintain positive pressure to prevent moisture from entering and condensing, the lowest applicable to liquid nitrogen temperature.

 Vacuum powder insulation is a vacuuming of the space in which the powder is filled, which reduces the heat transfer of the gas, and the powder particles also weaken the radiation heat transfer, so that the heat insulation effect is better. (The technology used by Jianshen company cryogenic storage tanks is vacuum powder insulation)

 The cryogenic storage tank is a double-layered cylindrical structure, the inner cylinder and its piping are made of austenitic stainless steel, the outer casing is made of carbon steel, and the interlayer is filled with expanded perlite (also known as pearl sand) and a specially treated adsorbent is provided, and It is pumped to a high vacuum (0.5 to 6 Pa) and has a capacity of 200 m3 or less. The working pressure is high (the working pressure of the two storage tanks in the four workshops is 2.0 Mpa), and there is a gasifier outside the tank, which can make the pressure boost in the tank easy to charge, and can directly send the pressure gas.

 LNG cryogenic storage tanks can be divided into fixed type and transport type according to their use. The fixed type is mainly used for the storage of cryogenic liquids. It is installed at the production site, point of use or supply station of cryogenic liquids; Or the supply station is shipped to the point of use, often in the form of land transport, water transport, etc., they are called tank trucks, trailers and tankers.