Floating LNG production storage and offloading unit (FLNG

also known as LNG-FPSO) is a kind of floating production device for offshore gas field development. The natural gas liquefaction process is a core technology of FLNG

which has a huge impact on the safety

stability and costs of the equipment. Because of the special conditions of offshore operations

FLNG liquefaction process is required not only to achieve the most basic functions of liquefaction

it is also expected to overcome the interference of various constraints. In order to research the performance of the coil wound heat exchanger under sloshing conditions at sea

an experimental device of dual mixed refrigerant liquefaction processes is established and the sloshing experiment of coil wound heat exchanger is carried. The results show that:when the experimental device is under sloshing conditions

pressure reduces before throttle valve and increases after the throttle valve

the performance of throttle valve and coil wound heat exchanger becomes worse.