Self-supporting type LNG (Liquefied Natural Gas) storage tank

Abstract

The invention discloses a self-supporting type LNG (Liquefied Natural Gas) storage tank which comprises a main storage tank body, wherein the main storage tank body is arranged on a pile foundation and comprises an outer concrete tank and an inner composite steel structure tank which is sleeved in the outer concrete tank; the outer concrete tank comprises a concrete bearing platform, a concrete tank wall and a concrete tank top; the concrete bearing platform is arranged on the pile foundation; and the tank top of the outer concrete tank is communicated with an LNG feeding pipeline, is communicated with an outward LNG transporting system and is also communicated with a pressure protection system. According to the storage tank, a wall plate of the inner tank can bear hydraulic pressures at different position heights by being densely added with rib piece and strengthening ring structures, so that the wall plate is thin, the composite structure can enable the material utilization rate to be high, and the investment cost of the LNG storage tank can be reduced to a great degree; the wall plate of the inner tank is thin, so that most of prefabricating and mounting processes of the wall plate of the inner tank, the rib piece and strengthening string composite structures can be finished in advance in a workshop or a site, and the high-altitude welding amount is reduced; and the compared with the conventional LNG storage tank, the LNG storage tank disclosed by the invention can be used for shortening the construction period.

Description

technical field [0001] The invention relates to an LNG storage tank, in particular to a self-supporting LNG storage tank. Background technique [0002] Liquefied natural gas (LNG) is when natural gas is cooled to a low temperature of -162°C under normal pressure, the natural gas changes from a gaseous state to a liquid state, the volume is about 1 / 600 of the volume of the same amount of natural gas, and the density is about 450kg / m 3 . LNG is colorless, odorless, non-toxic and non-corrosive. [0003] LNG is usually transported by professional transport ships from the liquefaction plant to the LNG receiving station by sea, stored in LNG storage tanks, and then transported to users through pipelines after regasification. In the liquefied natural gas industry chain, LNG storage is a very important link. [0004] Whether it is a natural gas liquefaction plant or an LNG receiving terminal, the investment in LNG storage tanks occupies a relatively high proportion, especially in...

AI Technical Summary

Problems solved by technology

However, the restrictions on the thickness of the main container wall plate and the construction technology restrictions such as large-volume welding have brought bottlenecks to the large-scale development of the above-mentioned existing tank types.

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