Built-in pump LNG (liquefied natural gas) storage tank

Abstract

The invention relates to a built-in pump LNG (liquefied natural gas) storage tank, belongs to the field of LNG storage devices, and discloses the built-in pump LNG storage tank. The built-in pump LNG storage tank comprises an LNG storage tank body and a pump well, wherein the pump well is connected on the LNG storage tank body, and stretches into the LNG storage tank body; an LNG immersed pump is arranged in the pump well; one end of a liquid outlet hose is connected on the LNG immersed pump, and the other end of the liquid outlet hose is communicated to the outer part of the pump well; a hoisting mechanism used for hoisting and lifting the LNG immersed pump and a pump well blind flange used for sealing the pump well are arranged at the opening part of the pump well; a pump well bottom valve is arranged at the bottom of the pump well; the pump well bottom valve comprises a valve seat, a valve core and a spring seat; the spring seat is fixedly connected with the valve seat through a valve core guide pillar; the valve core is arranged on the valve core guide pillar in a sleeving manner, and is propped against the spring seat through a spring; the valve seat and the valve core are sealed through a valve seat sealing element; and the valve core of the pump well bottom valve is pushed open under the gravity action of the LNG immersed pump, or is closed under the elastic action of the spring.

Description

technical field [0001] The invention relates to an LNG storage tank with a built-in pump, belonging to the field of LNG storage equipment. Background technique [0002] LNG (LiquefiedNaturalGas), the English abbreviation of liquefied natural gas. Natural gas is a combustible gas that is naturally mined in gas fields, and its main component is methane. LNG is condensed into liquid by cooling gaseous natural gas to -162°C under normal pressure. Liquefied natural gas can greatly save storage and transportation space and cost, and has the characteristics of large calorific value and high performance. LNG is a clean and efficient energy source. Because importing LNG helps energy consuming countries to diversify energy supply and ensure energy security, while exporting LNG helps natural gas producing countries to effectively develop natural gas resources, increase foreign exchange income, and promote national economic development, LNG trade is becoming a global energy market. ...

AI Technical Summary

Problems solved by technology

[0003] In the current industry, the built-in pump LNG storage tank is to place the LNG submersible pump directly inside the storage tank. During maintenance and replacement, the internal medium of the storage tank needs to be emptied and cleaned before maintenance or replacement, which wastes a lot of resources and maintenance time ;The bottom hole valve of LNG storage tank with bottom hole valve cannot be disassembled, and the valve core and valve seat seal cannot be replaced

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