JOURNAL OF THE MARINE ENGINEERING SOCIETY IN JAPAN

Show abstractHide abstract

We investigated the steam turbine propulsion plant of 80, 000PS output for 1 million dwt tanker under the design conditions that the specific fuel consumption as target was not greater than 170 g/PS⋅h and the plant was realizable in the near future applying marine technology not deviating too far from the present state of art.
As the result, it was concluded that the SFC of 169 g/PS⋅h is attainable by the reheat cycle plant of the steam condition of 140 atg×540 t/540°C, 5-stage feed water heating, and proper driving system for principal auxiliary machineries, and that the extra acquisition cost of the planet due to higher grade is redeemable in 3-5 years by the saving of fuel consumption.
Following studies were also made,
(1) Consideration concerning the problems about main turbine and boiler caused by larger output and elevated steam temperature and pressure, and experimental studies concerning some of the problems were carried out.
(2) Consideration concerning the problems on arrangement in engine room.
(3) Studies on automation system including the early stage diagonosis of unusual running state of machineries in engine room.

View full abstract

Download PDF (1008K)

As a means of heat recovery in marine field as well as in land industrial processes, the use of waste heat boilers to generate steam which derives conventional steam turbine, in turn, drive electrical generator is well-known technique. While, in many potential waste heat applications, the gases or liquids which function as the heat source are relatively low temperature levels. It is hardly possible to operate an efficient and simple Rankine Cycle engine using steam as the working fluid with these low heat source temperature. One of the attractive features of a Rankine Cycle with Organic working fluid is its ability to operate efficiently with low temperature heat source, which permits use of various low grade energy source have not been effectively harnessed in the past. This Organic Rankine Cycle System is based on the use of Fluorinol-85 as a working fluid. In addition to desirable thermodynamic characteristics, use of this fluid has the following primary advantages relative to steam cycle waste heat recovery system
•Substantially higher power output
•High conversion efficiency
•Simple and compact turbine design

View full abstract

Firstly, a theoretical comparison of performance of Stirling engine cycle of various types, the Rombic type, L (or V) type, and Inversed T type (I-T type), is shown in this report.
By the results, the non dimensional power Δpm/pm is highest for the I-T type with adequate value of x (non dimensional volume difference between low temperature cylinder and high temperature cylinder of displacer cylinders) .
Also it is shown that, the weight ratio of gas which pass through regenerator to the total gas is highest at I-T type.
Secondly, an experiment of Stirling engine of L-type by atomospheric air is reported here.
By its results, the power is high when the pressure drop by the regenerator is smaller than 1/10 of mean absolute pressure.
The tendency of performance is known to be proportional with Schmidt theory that uses two region model of constant temperature.
By this study many fundamental knowledge about Stirling Engine is accumulated very much.

View full abstract

Register with J-STAGE for free!