Study On The Design Of The Oil Spill Recovery And Storage System And The Mooring Characteristics

Accompanied by the rapid development of the offshore oil industry,marine oil spill accidents occur frequently,resulting in a number of serious oil pollution accidents.At present,offshore oil pollution has become one of the most serious and complex problems in marine pollution.How to recover and store oil spills is a very important research topic,which is of great practical significance.For decades,the rapid development of Computational Fluid Dynamics(CFD)technology and the continuous improvement of computer performance have attracted more and more attention in numerical modeling and prediction of ocean structures based on CFD technology.Based on the JONSWAP wave spectrum and NPD wind spectrum,the ANSYS and Orcaflex software are used as the tools to analyze the static and time-domain responses of the floating storage tank and its mooring system.The technical feasibility of the oil tank proposal,including the effect of mooring on static and dynamic response characteristics of oil storage tanks is analysed.Then the suitable proposal for recovered leaked oil storage system is recommended.Firstly,different storage proposals for leaked oil recovery are analyzed and steel floating oil storage tank with distributed mooring system is proposed as the research object of this paper.Then the structural strength for the floating oil storage tank under operation and installation conditions,the intact and damage stability are analysed to find a reasonable structural design.Based on the characteristics of metocean data of the proposed target sea area and the common used mooring system,three mooring arrangements are developed.Then the mooring static characteristics and overall positioning ability of different mooring arrangements are analyzed.Based on the analysis results,mooring system with six anchor chains are determined.Then the dynamic analysis for six anchor chains are carried out.The horizontal displacement of the oil storage tank,the maximum tension of the mooring chain and so on were investigated in detail.At the same time,the causes of the trend of the analysis results are analyzed,and the technical difficulties of shallow water mooring system design are pointed out.The mooring system proposal and anlysis results laid the foundation for the future implementation of marine oil spill recovery and storage system.Finally,based on the analysis results of the storage and mooring system,it is concluded that for the shallow water oil leakage,floating oil storage tank with six-chain mooring system is a recommended proposal with good technical feasibility.