The Application Of Main Generator Water Cooling System For Offshore Platform In High Turbidity Sea Area

This thesis studies the difficult problem of water cooling system of the main diesel generator set of the high turbidity sea,summarizes the factors restricting the water cooling system and formulates a targeted solution.The thesis makes the selection and application of filtration equipment,the innovation concepts of the optimal flow rate of cooling water and cooling seawater cycling tank.And then this thesis designs once–through cooling system and circulating cooling system based on a practical engineering.This thesis also does a water trough test in the laboratory to put an experimental study on optimal flow velocity of cooling water based on the theory of sediment incipient motion.This thesis analyses the water cooling system effect of main generator set in offshore jack–up platform by FLUENT and designs a cooling water waste heat utilization to verify the feasibility of the water cooling system used in high turbidity sea area.The main tasks completed are as follows:(1)The silt particles incipient velocity is measured to be 83.8 cm/ through laboratory test and theoretical analysis and the optimal flow velocity of cooling water is 91.2 cm/s which is based on this incipient velocity.(2)The once–through cooling(combination of air cooling and water cooling)has four modes,which can be easily applied to the existing jack–up platform in high turbidity sea area.(3)The cooling seawater cycling tank being defined can be used as an alternative type of seawater cooling tower to carry out a shortdated circulation cooling system.(4)The cooling water waste–heat utilization is feasible.The cooling water will be heated to a certain temperature to the well washing and replace the fuel boiler of the previous platform to save energy and environmental protection.