3 / 2021-07-30 10:43:27

Visualization Experimental and Numerical Study on Multiphase Flow Characteristics of Main Cryogenic Heat Exchanger in Offshore Liquefied Natural Gas Industry Chain

LNG-FPSO,LNG-FSRU,Sea condition,Numerical simulation,Visualization experiment

The deep-sea natural gas resources are safely and efficiently sent to the energy market through the offshore liquefied natural gas (LNG) industry chain, which provides a feasible idea for the utilization, development, storage and transportation of deep-sea natural gas fields. The offshore LNG industry chain includes production equipment (LNG-FPSO, LNG Floating Production Storage and Offloading Unit, also known as FLNG) and receiving equipment (LNG-FSRU, LNG Floating Storage and Regasification Unit). Due to the influence of sea conditions, the key cryogenic heat exchangers in LNG-FPSO and LNG-FSRU have the problem of insufficient heat transfer caused by uneven distribution of multiphase flow, which affects the performance index of liquefaction and gasification process. In this work, the visualization experimental device and numerical simulation model of falling film flow in LNG-FPSO and multiphase flow of intermediate medium in LNG-FSRU have been established, based on the sloshing platform system, camera and processing system, VOF two-phase flow model and dynamic grid technology. The measures are put forward to improve the offshore adaptability of multiphase flow in offshore LNG industry chain. When the anti-sloshing angle of the cover plate is 15 °, the liquid fluctuation index (FI) is small and the anti-sloshing resistance is good. The optimal number of transverse anti-sloshing separators is 3, and the anti-sloshing partition number required for unit axial length is 7.5.