LNG Cryogenic Storage Tanks

At present, the LNG cryogenic storage tanks commonly used at home and abroad have three methods: atmospheric pressure storage, pressure storage of daughter tanks and pressure storage of vacuum tanks. Which storage method is used depends mainly on the amount of storage.

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1.Low Temperature Atmospheric Pressure Tank

The structure of the atmospheric tank includes bimetal tanks, and the outer tank adopts prestressed concrete structure; there are above-ground tanks and underground tanks, and most of them below 20,000m³ are bimetal tanks.

The inner and outer tanks of the atmospheric tank are installed and manufactured on site, and the production cycle is long.

The operating pressure of the LNG low temperature and atmospheric storage tank is 15KPa and the operating temperature is -162 ° C. It is a flat-bottomed double-walled tank. The tank body is composed of two layers, the inside and the outside, with a heat-insulating structure and a cold-keeping layer. The inner tank is used to store liquefied natural gas, while the outer shell is used to protect and keep cold. In order to reduce the introduction of external heat into the tank, the inner and outer tanks are designed to be separate and independent. The tank item is a self-supporting vault. The inner tank item must have sufficient strength and stability to withstand the external pressure caused by the cold insulation material and the internal pressure generated by the internal gas.

The storage tank adopts pearlescent sand as the cold insulation material and is filled with dry nitrogen to ensure the micro-positive pressure of the interlayer, the thermal insulation material is isolated from the atmosphere, avoiding the influence of atmospheric pressure or temperature changes, and the humid air entering the cold insulation layer between the inner and outer tanks. The service life of the cold insulation material is effectively guaranteed and the use effect of the cold insulation material is effectively guaranteed and improved. When designing and manufacturing thermal insulation structures, care must be taken to prevent moisture.

Through technical and economic comparisons, the one-time investment of the low-temperature and atmospheric-pressure storage tank scheme is lower than that of the mother-and-son tank scheme, but the operating cost of the low-temperature and atmospheric-pressure storage tank scheme is much higher than that of the mother-and-son tank scheme.

Features of our Low Temperature Atmospheric Pressure Tank

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• Adiabatic method: adiabatic powder accumulation
• Effective volume: m³ &#; 50,m³
• Working pressure: 10k Pa &#; 50k Pa
• Storage medium: LNG, liquid ethylene, etc.
• Structural characteristics: vertical, flat bottom, suspended ceiling, double-walled, all-inclusive structure with thermal angle protection
• Foundation type: concrete foundation overhead

2. LNG Mother and Child Tank

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 container covered by multiple inner tanks. The inner and outer tanks are also filled with thermal insulation material. The interlayer is filled with dry nitrogen to prevent moisture. Air enters. The inner tanks of the mother and child tanks are manufactured at the factory and transported to the site after pressure testing, and the outer tanks are installed on site.

Storage and distribution stations with a storage scale of m³ to m³, can choose the mother-tank or atmospheric tank for storage according to the situation. Due to the requirements of internal tank transportation, the maximum domestic single-tank can reach 250m³. The process is roughly the same as the vacuum tank. Because the interlayer requires nitrogen, an additional liquid nitrogen device is added to the device.

Features of our LNG Mother and Child Tank

• Effective volume: 600m³ ~ m³
• Working pressure: 0.3MPa ~ 1.0MPa
• Adiabatic method: pearlite sand powder accumulation insulation & slightly positive pressure dry nitrogen
• Medium: liquid oxygen, liquid nitrogen, liquid argon, LNG, liquid ethylene, etc.

3. LNG Vacuum Storage Tank

The LNG 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, the interlayer is filled with thermal insulation material, and the vacuum is evacuated. The vacuum tank is transported to the site as a whole after the factory pressure test is completed.

The total storage capacity of LNG is below m³. Generally, multiple vacuum tanks are used for centralized storage. At present, the maximum volume of a single vacuum tank in China is 150m³. The process of the vacuum tank is relatively simple. Generally, a pressure booster is used to pressurize the storage tank. The material flows by pressure into the gasifier without using power equipment. The energy consumption is low. Therefore, small domestic and foreign LNG gasification stations basically use vacuum Pot form.

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