Long-distance LNG unloading pipeline system and unloading method

Abstract

The invention discloses a long-distance LNG unloading pipeline system and an unloading method. The unloading pipeline system comprises an LNG unloading system, an LNG secondary pressurization system, an LNG storage system, an LNG gasification system and a liquid nitrogen circulation system. Compared with the prior art, the unloading pipeline system has the advantages that firstly, the LNG unloading pipe cold insulation system is good in effect, the heat loss of a unit length pipeline is small, and the resistance loss is low; secondly, an LNG buffer tank and the secondary pressurization system are additionally arranged, the LNG conveying lift is improved in the conveying process, and the conveying distance of the LNG unloading system is longer; and thirdly, compared with the technical scheme for meeting LNG unloading through sea reclamation, the system is lower in investment cost and more environmentally friendly.

Description

technical field [0001] The invention relates to a long-distance LNG unloading pipeline system and an unloading method. Background technique [0002] At present, the world's large LNG receiving stations need to be compatible with 266,000 m 3 LNG ships, so consider the unloading time limit (refer to the provisions of the China Petroleum LNG long-term trade agreement, the LNG carrier should not berth at the port for more than 36 hours, and the total operating time before and after unloading is about 11 hours, so the unloading time is about 25 hours , the current largest LNG carrier is a 267,000-square-meter ship, and the required minimum unloading speed is about 10,400m 3 / h), at a flow rate of 12000m 3 Under the working condition of / h, the longest distance that can be transported by the unloading main pipe of DN1000-DN1200 is about 3km (the distance from the LNG terminal to the storage tank of the LNG receiving station). If the proposed LNG terminal is more than 3km away f...

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Problems solved by technology

[0004] In order to overcome the shortcoming of the short service distance of the existing LNG unloading pipe transportation system and solve the problem of difficulty in site selection of long-distance LNG wharfs, the present invention provides a long-distance LNG unloading pipeline system and unloading method, Combining the existing manufacturing level of LNG discharge pipelines at home and abroad, at the same time, the LNG discharge pipe resistance loss, LNG buffer tank, secondary pressurization, and LNG discharge pipe cold preservation technology have been improved and innovated. The engineering application of the present invention will Breakthrough LNG receiving station site selection is limited by the conditions of long-distance LNG terminals. Compared with the traditional land reclamation scheme, the long-distance LNG unloading pipeline system has the advantages of low investment, mature technology, reliability and environmental protection, and can realize engineering applications.

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