| 摘要 |
PROBLEM TO BE SOLVED: To reduce energy consumption required for fuel oil supply for a ship, and to simplify piping to increase a degree of freedom of design of equipment layout or the like and thereby to reduce a production cost and maintenance load. SOLUTION: Triaxial screw pumps 14A, 14B are installed to a fuel oil supply line 13. Appropriate frequency is calculated based on information about amount of fuel oil consumption measured by an injection amount measuring instrument 33. Difference between an actual fuel oil consumption by a main engine 12 and a generator, and the fuel oil supply amount and fluctuations caused by temperature or viscosity of fuel oil are corrected by a PI control based on information about pump discharge pressure from a pressure transmitter 34, and a power supply frequency of a motor 35 driving the triaxial screw pumps 14A, 14B is controlled, to continuously control a speed of rotation of the pump within a range from 0 to 1800rpm. COPYRIGHT: (C)2005,JPO&NCIPI
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