Improvement and application of trial operation technology for LNG receiving terminal

Abstract

LNG receiving terminal, as an important transfer station for China to receive imported LNG resources, still has problems such as high trial operation costs, large material consumption and long trial operation time. In response to this, technology improvement was implemented in the four processes of pipeline precooling, unloading pipeline filling, tank precooling and BOG system trial operation based on the trial operation of the LNG receiving terminal of PipeChina Shenzhen Natural Gas Co. Ltd., and the trial operation technology was applied practically. The results show that: pipeline precooling with liquid nitrogen could realize the precooling and filling of the unloading pipeline, the wharf circulation pipeline for cold insulation and the low-pressure LNG export pipeline at the same time, and the nitrogen can be recycled after precooling the unloading pipeline. Besides, the precooling of the next tank can be started while the first precooled tank is unloaded at a small flow. Thus, the two precooled tanks can be unloaded at full flow simultaneously. In addition, the improved technology optimization method effectively reduces the material consumption of trial operation, saves the trial operation cost, and shortens the time for trial operation, thereby ensuring the safety of trial operation. Generally, the research results could provide a practical reference for the safe,stable and efficient trial operation of LNG receiving terminals.

Keywords

• lng receiving terminal
• trial operation
• process improvement
• liquid nitrogen precooling
• tank precooling
• test process