Technical Papers
High-Powered ADD30V Medium Speed Diesel Engine
Shuhei Mizuhara**, Motomu Kunimitsu**, Osamu Beppu**, Motoyuki Takahashi**, Atsushi Sakane**, Masaki Tanaha**
The world's first ADD30V medium speed diesel engines were produced and delivered for marine and stationary applications by Mitsui Engineering & Shipbuilding Co., Ltd. under the license of ADD Co., Japan.
This engine achieves extremely high power with B.M.E.P. up to 2.7MPa and mean piston speed up to 12m/s, coupled with light weight and space saving compactness. In addition, high reliability as well as low fuel oil consumption is obtained.
This paper describes the design features of principal components, such as the welded integral engine frame of steel modules, the crankshaft with cold-rolled fillets coupled with induction-hardening, the piston of diffusion-bonded integral, the cylinder liner and the piston rings coated with wear-resistant ceramic, the single valve gas exchanging system, etc., which enable the ADD30V engine to achieve the above advantages under the extremely high power.
Finally, the engine performance and the operating results are described on the basis of actual test results.
1. Introduction
Marine diesel engines have built up the major position as the prime movers of vessels through the continual technological innovations concerning high power, high thermal efficiency, high reliability, flexibility against various fuels and clean emissions, etc.. On the other hand, an increasing demand for high-speed and mass marine transportation, which requires high-powered prime movers with light weight and small space, claims the great innovations to marine diesel engines. From this viewpoint, the medium speed diesel engine ADD30V (bore 300mm x stroke 480mm) with a power range 3,300-10, 300kW has been developed by ADD (Advanced Diesel Engine Development) Co., Japan, having the following features which yield substantial gains in operating economy.
- outstanding increase in engine power
- light and compact
- low fuel consumption
- high reliability
- easy maintenance
Various advanced technologies have been developed through extensive fundamental testing and analysis to achieve the above excellent features. A high degree of reliability was well proved through the 5,000-hour endurance test of the prototype 6ADD30V including 2,200-hour running at 110% load between 1992 and 1996.
Mitsui Engineering & Shipbuilding Co., Ltd, the major stockholder of ADD Co., has fully cooperated through ADD's research and development, and started the production and sales activities of the ADD30V engine since early 1996 under the license of ADD Co.. In 1997, two sets of 6ADD30V (2,980kW x 720rpm), the world's first ADD30Vs, were built and installed in the observation vessel for Japan Maritime Agency where the engines are used for the main diesel-electric propulsion system. The second set of 6ADD30V (3,290kW x 720rpm) for 3.1MW stationary power plant was built and installed at Mitsui's Tamano works and put into service on April 1st, 1997. In 1998, four sets of 16ADD30V (8,800kW x 750rpm) for 32MW IPP, as shown in Photo 1, were delivered to Saba, Malaysia and commissioned in March, 1999.
The design features and the operating results of ADD30V are described in this paper, especially focusing on the new design concepts which enable the ADD30V to achieve the unbeaten advantages under the extremely high power.
2. Engine Particulars and Principal Features
The principal engine data are given in Table 1 and a cross-section is shown in Fig. 1. The principal structure and dimensions of the ADD30V is the same as the prototype 6ADD30V except that two smaller exhaust gas receivers are arranged for multi-cylinders' engines.
* Translated from Journal of MESJ Vol. 33, No. 12
(Manuscript received Aug. 29, 1998)
** Mitsui Engineering & Shipbuilding Co., Ltd.
(Tama, Tamano City)
