LNG-FSRU中间介质再气化工艺优选

Comparison and selection of LNG-FSRU intermediate fluid regasification processes

LNG浮式储存与再气化装置(Floating Storage Regasification Unit,FSRU)的建设周期短、装置灵活性高,其再气化模块是LNG-FSRU的重要功能模块,中间介质气化器(Intermediate Fluid Vaporizer,IFV)则是LNG-FSRU关键设备之一。基于LNG-FSRU中间介质再气化工艺现状,选择4种中间介质与2种加热源进行组合,确立8种再气化工艺流程,利用Aspen HYSYS软件建立再气化工艺流程模型,对再气化工艺进行敏感性分析。模拟结果表明:以丙烷为中间介质的整体式海水加热再气化工艺所需的海水流量及丙烷循环量较低,气化器结构紧凑、经济性好,其可作为LNG-FSRU再气化工艺的首选;当海水温度较低时,可采用海水和蒸汽联合加热的再气化方式。研究结果可为LNG-FSRU再气化系统的设计提供参考。

LNG floating storage regasification unit（LNG-FSRU） is characterized by short construction period and strong flexibility. Its regasification module is the important functional module of LNG-FSRU and the intermediate fluid vaporizer（IFV） is one of the key equipments of LNG-FSRU. Based on the status of LNG-FSRU intermediate fluid regasification technologies, 4 intermediate fluids and 2 heating sources were combined to build up 8 LNG regasification processes. Then, the regasification process model was established using Aspen HYSYS software, and sensitivity analysis was carried out on the regasification process. It is indicated that the integrally-installed seawater regasification process with propane as the intermediate medium is low in seawater flow rate and propane circulation rate and its vaporizer is structurally compact and economically good, so it can be taken as the first choice LNG-FSRU regasification process. When the seawater temperature is low, the regasification can be realized based on joint heating of seawater and steam. The research results can provide reference for the design of LNG-FSRU regasification system.