Long-distance lng unloading pipeline system and unloading method

Abstract

The invention discloses a long-distance LNG unloading pipeline system and a unloading method. The unloading pipeline system includes 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 positive effects of the present invention are: 1. The effect of the LNG unloading pipe cold preservation system is good, the heat loss per unit length of the pipeline is small, and the resistance loss is low; 2. The LNG buffer tank and the secondary pressurization system are added In the process, the LNG conveying head is increased, so that the conveying distance of the LNG unloading system is longer; 3. Compared with the technical solution of reclamation and land reclamation to meet the LNG unloading, the present invention has lower investment cost and is more environmentally friendly.

Description

Technical field [0001] The present invention relates to a long-distance LNG discharge pipeline system and discharge method. Background [0002] At present, the world's largest LNG receiving stations need to be compatible with 266,000 m 3 LNG ships, therefore consider the unloading time limit (referring to the provisions of the PetroChina LNG long-term trade agreement, the LNG transport ship in the port berthing time is not more than 36 hours, the total operation time before and after the unloading is about 11 hours, the unloading time is about 25 hours, the current maximum LNG transport ship is 267,000 square meters, the minimum unloading rate is about 10400m 3 / h), at a flow rate of 12000m 3 Under the working conditions of / h, the unloading ship main pipe using DN1000-DN1200 can usually transport a maximum distance of about 3km (the distance from the LNG terminal to the LNG receiving station storage tank). If the proposed LNG terminal is more than 3km away from the onshore LNG ...

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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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