China Huanqiu Contracting & Engineering Corporation Ltd (HQC-BJ),affiliated company of China National Petroleum Corporation (CNPC),has continued to develop new process and improve existing technology for hydrocarbon liquefaction and fabrication businesses and cryogenic storage business,since 1990's,especially liquefied natural gas (LNG).Nowadays LNG train capacity becomes larger,LNG Plant becomes to have multi trains,as well as environmental protection demand becomes more strictly throughout the world.Therefore,the performance-based design and refinement-based design are becoming the requirement of modern engineering design,and then dynamic characteristics of critical equipment and process systems need to be taken into account.HQC has studied dynamic simulation technology to apply in the LNG plant.The dynamic simulation model is built based on the proven practices of a mature LNG plant (for which HQC had provided all the technical and engineering construction services,including process design package of HQC-DMR (Dual Mixed Refrigerant developed by HQC) liquefaction process,front end engineering design,EPC and commissioning and start up.In-house study involves liquefaction system,hydrocarbon fabrication and LNG storage,and analyzes various scenarios,e.g.emergency shutdown,black start up,compressor trip and so forth.Combining with engineering experience,operation and start up experience,the possible scenarios with large impacts to the operation and to the critical equipment are identified via the simulation procedure and simulation results,and the potential control optimization and key points of engineering design are also obtained.This paper will introduce the details for the dynamic simulation study for liquefaction unit.
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