Talking about the three methods of LNG storage tank
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- Time of issue:2021-06-27
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(Summary description)Vacuum insulated pipeline is suitable for long-term continuous transportation of liquid nitrogen, liquid oxygen, liquid hydrogen, liquid helium, etc. The vacuum degree of the insulated space is better than 0.01Pa, and the ratio of the diameter of the inner and outer pipes is 2~2.8.
Talking about the three methods of LNG storage tank
(Summary description)Vacuum insulated pipeline is suitable for long-term continuous transportation of liquid nitrogen, liquid oxygen, liquid hydrogen, liquid helium, etc. The vacuum degree of the insulated space is better than 0.01Pa, and the ratio of the diameter of the inner and outer pipes is 2~2.8.
- Categories:News
- Author:
- Origin:
- Time of issue:2021-06-27
- Views:0
There are currently three methods for LNG storage tanks commonly used at home and abroad: atmospheric storage, magnetic mother tank pressure storage and vacuum tank pressure storage. The storage method used mainly depends on the size of the storage capacity. Let's analyze which ones are below.
LNG storage tank vacuum tank:
The vacuum tank is a double-layer metal tank. The inner tank is a low-temperature resistant stainless steel enterprise pressure vessel. The outer tank uses ordinary carbon steel production materials. The middle layer is filled with a heat insulation layer and vacuumed. The vacuum tank is transported to the site as a whole after pressure test by the factory.
The total storage capacity of LNG is below 1000 meters. Generally, the storage and management of multiple equipment vacuum tanks are concentrated. At present, the single tank volume of vacuum tanks used by domestic enterprises in my country is at most 150 meters. The vacuum tank process can be relatively simple. Generally, through the use of a booster pressurized water tank, the material flows into the vaporizer under pressure, and no learning power technology equipment is used, and the energy consumption is low. Therefore, researches on domestic and foreign small LNG gasification stations basically adopt the form of vacuum tanks.
LNG storage tank:
The inner tank is a stainless steel pressure vessel that can withstand a variety of low temperatures. The outer tank is covered by a large carbon steel container outside of the inner tank. The insulation layer is also filled between the inner and outer tanks. The middle layer is protected from moisture by dry nitrogen. Air enters. The inner tube of the purple hat tank is manufactured by the factory, and is transported to the site after pressure test, and the outer tank is set on the site.
The storage scale is 1,000 meters to 5,000 meters. According to the situation, you can choose letter pain or upper tenderness. Due to the intercom transportation requirements, the current domestic short cylinder can reach up to 250 meters, and the gasification process using letter barrels is basically the same as that of vacuum tanks. The intermediate layer needs to pass nitrogen, so there is also a liquid nitrogen device in the device.
LNG tank atmospheric tank:
The structure of the atmospheric tank is a bimetallic tank and the outer tank is a prestressed concrete structure. There are bottom tanks and underground tanks, most of which are bimetallic tanks below 20,000 meters.
LNG storage tank cryogenic liquid transportation pipeline design:
Vacuum insulated pipeline is suitable for long-term continuous transportation of liquid nitrogen, liquid oxygen, liquid hydrogen, liquid helium, etc. The vacuum degree of the insulated space is better than 0.01Pa, and the ratio of the diameter of the inner and outer pipes is 2~2.8.
Various vacuum-type liquid transfer pipes of LNG storage tanks basically adopt a sleeve structure. External pipes generally use brass or stainless steel, and internal pipes generally use stainless steel pipes. Every certain distance, a support structure should be added to the internal pipeline. The supporting structure is often triangular, square or spherical.
The cold axis compensation of the vacuum insulated infusion tube is very important. Generally, the metal tube shrinks from room temperature to liquid nitrogen temperature of about 2.9 mm, to liquid helium temperature of about 3 mm. Usually bellows are used to compensate for temperature deformation, or especially made of materials with a low expansion rate.
Vacuum adiabatic liquid pipe is a liquid pipe with low cooling consumption and low pre-cooling capacity, which is widely used.
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