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Regasification system and method for offshore liquefied natural gas

A liquefied natural gas and regasification technology, applied in the field of regasification systems, can solve the problems of low heat that cannot meet regasification heat requirements, high seawater temperature and water quality requirements, and high energy consumption, and achieves low sea movement sensitivity, The effect of improving energy utilization and ensuring controllability

Pending Publication Date: 2020-11-03
CNOOC GAS & POWER GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former uses seawater as the only heat source and has higher requirements on seawater temperature and water quality; the latter can avoid the limitation of seawater conditions and use water vapor as the heat source to realize the closed cycle of the intermediate medium, but the energy consumption is higher than that of the open gasification mode
[0004] In view of the fact that seawater can be used as the only heat source for most of the year in China's waters, but the seawater temperature is too low to meet the regasification heat requirements in part of the winter, it is urgent to provide a floating LNG storage and regasification device that can be applied to the sea. The new method of opening and closing combination can be selected according to local conditions and sea area conditions to maximize the use of seawater heat and reduce energy consumption

Method used

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  • Regasification system and method for offshore liquefied natural gas

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Effect test

Embodiment 1

[0029] like figure 1 As shown, this embodiment relates to a regasification system for offshore liquefied natural gas, including:

[0030] LNG system, including booster pump inlet buffer tank 1, LNG booster pump 2, LNG vaporizer 4 and NG warmer 5; the outlet of booster pump inlet buffer tank 1 is connected to the input end of LNG booster pump 2 , the output end of the LNG booster pump 2 is connected to the first inlet of the LNG vaporizer 4, the first outlet of the LNG vaporizer 4 is connected to the first inlet of the NG warmer 5, and the first inlet of the NG warmer 5 The export is a natural gas export;

[0031] The steam system includes a circulating water pump 9 and a boiler 10, the output of the circulating water pump 9 is connected to the inlet of the boiler 10;

[0032] The seawater system includes a seawater preheater 6, the first inlet of the seawater preheater 6 is connected to the outlet of the boiler 10, the first outlet of the seawater preheater 6 is connected to...

Embodiment 2

[0042] like figure 1 As shown, this embodiment relates to a gasification method of an offshore LNG regasification system, comprising the following steps:

[0043] The LNG delivered from the LNG storage device is mixed in the booster pump inlet buffer tank 1 with the BOG cooled in the BOG cooler 3 and returned to the booster pump inlet buffer tank 1, and then sent to the LNG booster pump 2, and the LNG is boosted Pump 2 pumps high-pressure LNG to BOG cooler 3 and then enters LNG vaporizer 4 and NG warmer 5 sequentially. LNG vaporizer 4 vaporizes high-pressure LNG into NG, and then passes through NG warmer 5 Further heat exchange and temperature rise, output after reaching the temperature required for external output;

[0044] The circulating water pump 9 pumps the fresh water to the boiler 10, the boiler 10 heats the fresh water and generates steam, the steam enters the seawater preheater 6 and exchanges heat with the seawater in it to obtain preheated seawater, and the fresh ...

Embodiment 3

[0048] When the seawater temperature is high, the system can use seawater alone as a heat source, and the seawater system does not need to pass through the seawater preheater 6 to directly enter the intermediate medium evaporator 7 and intermediate medium preheater 8, and use the latent or sensible heat of the intermediate medium to realize LNG gasification.

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Abstract

The invention relates to a regasification system and method for offshore liquefied natural gas. A liquefied natural gas system comprises a booster pump inlet buffer tank, an LNG booster pump, an LNG gasifier and an NG temperature compensator; a steam system comprises a circulating water pump and a boiler, and the output end of the circulating water pump is connected with an inlet of the boiler; aseawater system comprises a seawater preheater; and an intermediate medium system comprises an intermediate medium storage tank, an intermediate medium circulating pump, an intermediate medium evaporator and an intermediate medium preheater. The regasification system disclosed by the invention adopts an open operation mode and a closed operation mode, and the system can be freely switched betweenthe open mode and the closed mode according to local conditions by virtue of switching of a heat exchange module.

Description

technical field [0001] The invention relates to a regasification system and method for offshore liquefied natural gas, belonging to the technical field of natural gas. Background technique [0002] Compared with onshore natural gas receiving stations, the offshore floating liquefied natural gas (LNG) storage and regasification unit (Floating Storage Regasification Unit, FSRU) has the advantages of short construction period and relatively low cost in natural gas peak shaving application is becoming more and more important. [0003] At present, most of the offshore LNG regasification systems are in the form of Intermediate Fluid Vaporizer (IFV). According to seawater conditions in different sea areas, the existing gasification system either adopts an open mode or a closed cycle. The former uses seawater as the only heat source, and has higher requirements on seawater temperature and water quality; the latter can avoid the limitation of seawater conditions, and uses water vap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17C7/04F17C13/00
CPCF17C7/04F17C13/00F17C2221/033F17C2223/0153F17C2223/0161F17C2227/0318F17C2227/0393
Inventor 孙亚娟安东雨彭延建陈峰吕梦芸陈锐莹姜夏雪
Owner CNOOC GAS & POWER GRP
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