船用タービンプラントの最適給水温度について : IBM 7090 によるヒートバランス計算の一例
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概要
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Heat balance calculation in a marine steam plant was done by a high speed digital computor IBM 7090 to find out the optimum feed water temperature which will minimize the fuel oil consumption rate. The plant employed in this example is a typical 18,000 PS plant with a generator load of 550 kW and secondary steam requirement of 675 kg/h. Calculations were made for each combination of three different steam conditions and three different steam cycles. We found that not only the final temperature of feed water but also the stagewise rise of the total feed water temperature have great effect on the fuel economy. The results presented here will serve as a guide for the design engineers to determine the feed water temperatures of multi-stage regenerative steam cycles. As our future task will be assigned a far more important and even more difficult problem as to plant parameters which will find out the minimum operating cost of a ship. A digital computor program which incorporates operating cost calculations together with heat balance calculations should be developed.
- 1963-04-30