| In order to solve the problem that the working medium transfer pump of the ship auxiliary system needs to constantly operate under the rated operating conditions up to the highest flow standard requirements during the voyage of the ship,but actually the system load is below the maximum required capacity in most time,resulting in the waste of massive energy,in this paper,the frequency conversion control technique was applied to the seawater pump in the central cooling water system with “Sansha No.1” traffic supply ship as the target ship and through the analysis of the law of heat transfer of the ship power auxiliary system and the energy consumption of various parts of the system,so that the seawater pump can reasonably adjust parameters according to the control change requirements for the power of the main engine and the temperature of the internal circulating cooling water in real time.The changes in the frequency of the seawater pump and the opening of the three-way valve affect the temperature of various cooling water and then affect the lubricating oil cooling system of the main engine and the ventilation system of the cabin.Constantly,the ship power auxiliary system is connected to form a comprehensive energy efficiency management system.In order to achieve the above-mentioned objectives,the following work was done in this paper:(1)A simulation model of the ship power auxiliary system was established on the Simulink software platform by modular modeling;(2)The frequency of the seawater pump and the opening of the three-way valve were controlled in the software TIA portal through S7-1200 PLC;(3)A parameter database was established through the Sql Server database for the ship power auxiliary system,and was used as a data interaction center to solve the problem of the communication between Simulnik and database and that between King SCADA configuration software and the database;(4)The problem of the communication between PLC and Simulink was solved through the Modbus TCP protocol;and that between PLC and the frequency converter was solved by the Modbus RTU protocol;(5)A human-machine interface(HMI)associated with the ship power auxiliary system was established in on the King SCADA configuration software platform.A comprehensive energy efficiency management system was designed for the ship power auxiliary system based on the above-mentioned work.The results of the simulation under three conditions of the reduced power of the main engine,reduced temperature of seawater and the combination of the two showed that this system could save 11.7%,24.1% and 26.9%of electric energy of the marine pump motor,respectively.Therefore,the energy efficiency management system proposed herein helps solve the problem of energy conservation of the ship power auxiliary equipment and is of reference significance for the research on ship engineering. |
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