| With the development of the deep sea, shallow waters and marginal oil fields, FPSO andother marine engineering equipment industry as the acquired offshore resources platform, tool,its application are more and more extensive. The FPSO,with production, storage andtransportation of various functions in one, is a large sea oil processing plant, and so important.Aiming at the problem of lag in FPSO oil storage tank cleaning technology, big risk, longcleaning cycle and ineffectiveness，in this paper a new FPSO oil storage tank cleaning methodby cleaning robot carries water jet device and sewage suction device is designed according tothe structure of FPSO oil storage tank and composition of oil sludge. Besides，cleaning robotand key components are designed or selection.Cleaning robot is equipped with water jet nozzle and the sewage suction device, with carbody fully sealed, can work under water, set the internal body micro positive pressure, soensures safety explosion-proof. When cleaning robot come in the cabin，cabin bottom can becleaned by water jet flow，and the striked oil sludge will be pumped to outside of the cabinand be treated.The robot has characteristics of simple structure and small size. The robot has goodmobility and high payload capabilities. Swing arm is designed, its structural dimensioncalculation, it can surmount obstacles of400mm; water jet use high-pressure, nozzle system isdesigned with swing mechanism; Sewage suction device uses diaphragm pump; usingpneumatic motor provides the power to the robot, Control mode uses all-pneumatic control.The overall structure and the drawing parts drawing with CAD software.In order to ensure the safety and durability of the cleaning robot, the finite elementanalysis were carried out on cleaning robot axle by ANSYS software, and ensure the stiffnessand strength of the axles meet the requirements of the design. In order to improve cleaning efficiency，the numerical simulation and analysis werecarried out on the speed attenuation characteristics of two kinds of nozzles efflux by FLUENTsoftware. At last, the optimum structural parameter has been acquired. The result determinedthe selection of cone straight-shaped nozzle, and showed that on condition of submerged theoptimal velocity distribution was obtained when contract angle was about13°and aspect ratioof the straight conical nozzle was about2.5.This paper puts forward a kind of systematic tank on-line cleaning technology, which canrealize the purpose of resource recovery, environmental protection and energy conservation.After engineering application, huge social and environmental benefits can be received. |
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