ABSTRACT

LNG Floating Production Storage and Offloading unit (FLNG) is one of the best models for deep-sea natural gas development. The core heat exchanger, which is efficient and compact and meets the conditions of sea conditions, is the difficulty of its design and construction. In this paper, we reviewed the research progress of the flow heat exchange performance of the core heat exchanger in FLNG, including the study on the structural parameters, operating parameters and swinging working conditions of the winding tubular heat exchanger, the influence of the channel form and structural parameters of the printed circuit board heat exchanger, and the research progress of the phase change kinetics of the mixed working fluid between the cold side and the hot side of the main low temperature heat exchanger, which provided a certain direction for the further study of the core heat exchanger of FLNG.

INTRODUCTION

Natural gas is currently recognized as a clean and low carbon energy in the world, which plays a key support role in the process of our country realizing the "double carbon" goal (Zhou Shouwei, Zhu Junlong, 2021). Our country is rich in natural gas resources, including the total amount of deep-sea gas field is considerable. At present, China's dependence on foreign natural gas is more than 40%, and it is an important measure to strengthen the development of Marine natural gas resources to ensure our energy security (Lu Jialiang, Tang Hongjun, Sun Yuping, 2019). LNG Floating Production Storage and Offloading unit (FLNG, also known as FPSO-LNG) is one of the best models for far-reaching offshore natural gas development. This mode is characterized by ease of migration and high security (Li Yuxing, Liu Liang, Wang Shaowei, et al., 2021). FLNG integrates the liquefaction, storage, loading and unloading of offshore natural gas, but the size of its upper module is only 1/6 of that of the same scale onshore LNG plant. Its key equipment, especially the main low-temperature heat exchanger in the liquefaction link, has small working space, difficult design and high investment cost, which seriously restricts the development of FLNG in China. In recent years, scholars have proposed new Pressurized Natural Gas (PLNG) Liquefied gas (PLNG) technologies (Xiaojun Xiong, Wensheng Lin, Anzhong Gu, 2016) that are able to achieve natural gas purification and liquefaction integration and greatly reduce the footprint. This is suitable for FLNG units. However, like conventional FLNG liquefaction technologies, the low temperature heat exchanger with high efficiency, compact and anti-sloshing is still the core problem to be faced.

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