LNG 接收站再冷凝器非设计工况运行动态模拟分析

DynamicsimulationanalysisonLNGreceivingterminalre-condenser’snon-designcases

关键词:  再冷凝器 低温过程 动态模拟 操作优化

Key words:  re-condenser,cryogenicprocesses,dynamicsimulation,operationoptimization

摘要:

再冷凝器的控制操作繁多且相互关联,容易造成操作不当,同时由于设备性能下降等原 因,再冷凝器运行经常进入非设计工况,影响接收站正常生产。利用动态模拟方法可有效还原事故经 过,探寻预防措施。在已有LNG接收站再冷凝系统动态仿真模型的基础上,完善了再冷凝器的冷凝量 计算模块,更加全面地模拟再冷凝器在各种工况下的运行情况,仿真结果得到了现场数据的验证。进一 步动态模拟探究了再冷凝器长时间高液位运行时,采用高压补气降低液位措施的风险,以及提出在截断 高压NG管线恢复正常运行过程中,需结合实际情况考虑重设气液配比系数的操作改进建议。

Abstract:

Astherearealotoftangledcontroloperationsaboutthere-condenser,withthe decreasingperformanceofrelatedfacilities,it’seasytorunintonon-designcases,andthiswillaffect thenormalproductionoftheterminal.Usingdynamicsimulationmethod,theaccidentprocesscanbe effectivelyreappearedandpreventivemeasurescanbeexplored.Basedondynamicsimulationmodel forLNGreceivingterminal’sre-condensingsystem,theconceptofmultiplyingheatexchangeareaby thepackingmaterialforthecondensingratecalculationisintroduced,there-condensermathematic modelisimprovedandverifiedbythefielddata.Further,theprocessofturningonNGinletflow afterlong-termhighlevelrunningissimulatedtoanalyzeitsaccidentrisk,andprocessofturningoff NGinletflow torestorenormally operationissuggestedtotakeresettingthegas-liquidratio coefficientattherighttiming.