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Three structures of LNG cryogenic storage tank
Date: Nov 18, 2019
At present, the commonly used LNG cryogenic storage tanks at home and abroad have three modes: atmospheric pressure storage, sub-tank pressure storage and vacuum tank pressure storage. Which storage method is used depends mainly on the amount of storage.
The vacuum tank is a double-layer metal tank, the inner tank is a low-temperature resistant stainless steel pressure vessel, the outer tank is made of carbon steel material, the interlayer is filled with the heat insulating material, and the vacuum is taken. The vacuum tank is transported to the site as a whole after the factory has been pressure tested. The total storage capacity of LNG is below 1000m3, and it is generally stored in multiple vacuum tanks. At present, the vacuum tank single tank volume used in China is up to 150m3.
The vacuum tank process is relatively simple. Generally, the supercharger is used to pressurize the storage tank. The material flows into the gasifier by pressure, without using power equipment, and the energy consumption is low. Therefore, the small LNG gasification stations at home and abroad basically adopt vacuum. Can form. (Jianshen Company can customize LNG vertical storage tanks and LNG horizontal storage tanks according to customer needs)
The inner tank of the mother tank is a plurality of low temperature resistant stainless steel pressure vessels. The outer tank is a large carbon steel vessel covered on a plurality of inner tanks, and the inner and outer tanks are also filled with a heat insulating material, and the interlayer is filled with dry nitrogen to prevent the wet. Air enters. The inner tank of the mother tank is manufactured at the factory, pressure tested and transported to the site, and the outer tank is installed on site.
The storage and distribution station with storage scale of 1000m3 to 5000m3 can be stored in the mother tank or the atmospheric pressure tank according to the situation. Due to the inner tank transportation requirements, the current domestic single tank can be up to 250m3, and the gasification process of the mother tank can be adopted. The process is roughly the same as that of the vacuum tank. Since the interlayer requires nitrogen gas, a liquid nitrogen device is added to the device.
The structure of the atmospheric pressure tank has a double metal tank, and the outer tank is made of prestressed concrete structure; there are above-ground storage tanks and underground storage tanks, and most of the below 20000 m3 are double metal tanks. The inner and outer tanks of the atmospheric pressure tank are installed and manufactured on site, and the production cycle is long.
The vacuum tank is a double-layer metal tank, the inner tank is a low-temperature resistant stainless steel pressure vessel, the outer tank is made of carbon steel material, the interlayer is filled with the heat insulating material, and the vacuum is taken. The vacuum tank is transported to the site as a whole after the factory has been pressure tested. The total storage capacity of LNG is below 1000m3, and it is generally stored in multiple vacuum tanks. At present, the vacuum tank single tank volume used in China is up to 150m3.
The vacuum tank process is relatively simple. Generally, the supercharger is used to pressurize the storage tank. The material flows into the gasifier by pressure, without using power equipment, and the energy consumption is low. Therefore, the small LNG gasification stations at home and abroad basically adopt vacuum. Can form. (Jianshen Company can customize LNG vertical storage tanks and LNG horizontal storage tanks according to customer needs)
The storage and distribution station with storage scale of 1000m3 to 5000m3 can be stored in the mother tank or the atmospheric pressure tank according to the situation. Due to the inner tank transportation requirements, the current domestic single tank can be up to 250m3, and the gasification process of the mother tank can be adopted. The process is roughly the same as that of the vacuum tank. Since the interlayer requires nitrogen gas, a liquid nitrogen device is added to the device.
The structure of the atmospheric pressure tank has a double metal tank, and the outer tank is made of prestressed concrete structure; there are above-ground storage tanks and underground storage tanks, and most of the below 20000 m3 are double metal tanks. The inner and outer tanks of the atmospheric pressure tank are installed and manufactured on site, and the production cycle is long.
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