This paper presents some findings obtained through the burning test of low grade fuels (bunker“C”) with the small diesel engine. The burning tests were carried out on the small, single cylinder, four stroke cycle, open chamber diesel engine of a compression ratio of 18 to 1 and a piston displacement of 1246 cm3. A/C blend fuels (bunker “A” + bunker “C”) and bunker “C” fuels bunkered at foreign ports (viscosity ranging 1300 to 3300 sec R.W. No. 1 at 50°C) and bunker “C” fuels produced experimentally were used for the comparative investigation of combustion performance of low grade fuels. In the case of A/C blend fuel, it shows better combustion performance than a bunker “C”. The A/C blend fuel which contains a bunker “A” more than 25% shows almost the same combustion performance as one of bunker “A”. Bunker “C” fuel shows a big ignition delay and a rapid rate of heat release at the beginning of combustion compared with a bunker “A”.
With the increasing of fuel oil prices and growing uncertainty of fuel oil supply, coal fired ships have come to the attract attention of shipping circles. Machinery Plant Committee of The Marine Engineering Society in Japan has done the basic investigation on coal fired steam propulsion plant. The study items are as follows. 1) Physical and chemical properties of coal 2) Coal combustion plant, such as Storker firing, Pulverized coal firing and Fluidized bed combustion system 3) Coal handling system 4) Ash handling system 5) Comparison of regulation for coal fired ship (LR, NV, ABS, NK)
The Research Committee on Engine Maintenance Standards, as one of the standing research committees attached to the Marine Engineering Society in Japan established in 1966, started its activities with the aim to research into marine engine maintenance standards. To date the Committee has produced several maintenance standards manuals, including those of Large Diesel Engine, in publication as its study reports. Subsequently the Committee selected Medium Speed Diesel Engine as its study theme. In this manual, the research objects are classified into Medium Speed Engine bodies, reduction gear arrangements, lubricating oil purifiers and strainers and remote control apparatus, respectively.
The development of Flange Mounted Propeller has been proceeded to improve on the fitting method of conventional propeller. This improved system, flange coupled propeller and shaft, has characteristics as follows; (1) lightened weight of propellers, and consequently decreased statical bending moment on the propeller shaft alignment. (2) simplified fitting and inspection works. F.M. Propeller was fitted on a ship and the test result was satisfactory so as to prove its full reliability on functional safety and effectiveness.
For designing the economical propulsion plants of medium speed engines, taking into account the decreasing of operation cost, the following particulars were discussed on this paper; fuel and lub. oil consumptions, ability to burn degraded quality fuel, reliability, ability to run at part load, advantages inherent to medium speed engines and the design of economical propulsion installations. Above all, the fuel consumption of less than 130 g/ps-h which was achieved on 8PC4-2 L engine, accepting a viscosity of 600 cst for the fuel of PC engines and the full use of the recovered power systems shall be appraised for planning of medium speed engines.