A system and method for offshore LNG reception

Abstract

The invention discloses an offshore LNG receiving system and method. The system comprises a full-cooling type LNG transport ship, an LNG receiving device, an LNG pressurizing gasification system, a natural gas cooling system, a cold-insulation circulating system and a ship-shore connecting system. The floating type or gravity base type offshore LNG receiving system is constructed at an offshore position to rewarm imported liquefied natural gas, the liquefied natural gas is conveyed to a natural gas trunk line through a single-point mooring device and a submarine pipeline to be received at the offshore position, and therefore the problem that the address of a dock for an LNG receiving station is difficult to select is solved. A shore-based LNG receiving and gasifying function is changed to be achieved at the offshore position, and therefore occupied port shoreline resources are reduced. Compared with a traditional dock loading technology, the offshore LNG receiving system is quite suitable for regions lacking natural ports and the condition that a port plan is difficult to change, the technology is simple, investment is low, the construction period is short, and if market changes, equipment can be transferred to other regions for continuous service.

Description

Technical field [0001] The invention relates to the technical field of storage and transportation of liquefied natural gas (Liquefied Natural Gas, LNG for short), in particular to an offshore offshore LNG receiving system and method. Background technique [0002] Liquefied Natural Gas (LNG), whose main component is methane, is recognized as the cleanest fossil energy on earth. It is colorless, odorless, non-toxic and non-corrosive. Its volume is about 1 / 625 of the same volume of gaseous natural gas. The mass of LNG is only about 45% of the same volume of water. [0003] The main component of liquefied natural gas is methane. The atmospheric boiling point of methane is -161°C, the critical temperature is -84°C, and the critical pressure is 4.1MPa. The manufacturing process is to first purify the natural gas produced in the gas field (dehydration, de-hydrocarbon, and de-acid gas), then use throttling, expansion and external cold source refrigeration processes to turn methane into li...

AI Technical Summary

Problems solved by technology

As for the low-temperature LNG carrier, due to its large storage capacity, the ship is usually 200-300 meters long and the full-load draft is 12-16 meters, which causes problems such as difficult site selection for the wharf, high construction cost, long construction period, and high wharf operating costs.

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