| Starting from January 1,2020,with the implementation of the IMO’s sulphur emission requirements for ships,the SO2 equivalent fuel sulphur content emissions of ships worldwide must be reduced to 0.5%,and within the control area,this indicator Must be less than 0.1%.For this reason,major shipping companies have actively sought effective means to meet the requirements of the Convention.As the initial investment cost is low,and it is not affected by high low-sulfur oil prices,the installation of desulfurization devices to treat exhaust gas has gradually become an effective means to solve ship sulfur emissions,and it has been favored by more and more shipping companies.The scrubber tower system mainly includes desulfurization main/secondary towers,inlet and outlet water monitoring devices,waste gas monitoring devices,piping systems,valves,etc.The renovation and installation work mainly covers: the renovation of the bottom and upper deck areas of the engine room,the production and installation of new sections,the hoisting of large equipment,the installation of fiberglass and seamless steel pipes,the installation and commissioning of related electrical equipment,etc.Due to the high complexity of engineering operations,systematically carrying out relevant research and design work is a necessary guarantee for the safe and efficient operation of all links in the construction phase.Based on the retrofit and installation of related desulfurization devices for a 200,000-ton-class bulk carrier,this article carries out research on related process design.The main contents are as follows:(1)Explain the technical development status of the ship’s desulfurization tower system,and carry out detailed design of the desulfurization tower system installation plan based on the hull structure and equipment layout characteristics of the ship.Among them,focused on the construction work in the bottom area of the engine room of the ship,the chimney area,and the newly-added section area,the process design optimization research was carried out.(2)Through a comprehensive statistical analysis of outfitting parts,a technical route to increase the pre-outfitting rate in the advance stage is proposed to optimize resource allocation and improve work efficiency.Focus on the research on the installation technology and precision control plan of glass steel pipe and seamless steel pipe,as well as the electric outfitting operation plan.(3)Designed the installation process of the desulfurization main/auxiliary tower and the production and installation process of the newly added section.In-depth research was carried out on the equipment hoisting process plan,and an overall hoisting process was proposed in which the floating vessel was used as the lifting equipment and the equipment was put in place first.(4)Considering the large volume and mass of the newly added desulfurization tower,the high pre-outfitting rate,and the low accuracy of the conventional strength theory check,the finite element analysis was performed on the overall hoisting of the newly added segment and the Ansys Workbench software was used.Calculate and check the lifting strength of the main tower equipment and the segmented structure,calculate and identify the parts that are prone to deformation,analyze the large deformation area and take local strengthening measures to provide a feasible process for the shipyard reconstruction and installation project reference. |
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