The NOx regulation by the IMO is basically coped with the Low NOx Atomizer. MES applied the NOx measures for the first time to two sets of the main engine 7S50MC (9,635 kW x 123 rpm) for the shuttle tanker to be built by Tsuneishi Shipyard and delivered to UGLAND Company, and carried out the shop trial of the main engine. Under the presence of DNV class surveyor, the NOx emission of 12.3 g/kWh was measured, which is below the limit of 17 g/kWh in E3 cycle, and the Certificate on Compliance with NOx regulation was issued. The ship is operated in a mode so as to comply with the IMO regulation. When the NOx reduction by over 30% is required, water emulsion is adopted, and this system has been sufficiently experienced with the shore-based power generating plants, presenting no problems.
(3) Annual results of manufacture
1) Number of production and output of marine diesel engines (not less than 100 PS) in 1997
* Low-speed diesel engines (including single exported engines) ： 98 sets, 1,815,830 PS
* Medium-speed diesel engines ： 3 sets, 14,010 PS
2) The Mitsui-MAN B&W NA turbo charger is mounted on S, K, L-MC engines, and 75 sets were manufactured in 1997. The models of production are three kinds, including NA70, 57 and 48.
2.4.13 Mitsubishi Heavy Industries, Ltd. (large engines)
(1) Engines developed in 1997
MHI has autonomously developed the UEC engine which is a large low-speed 2-cycle engine since 1955.
Now, the line-up of the UEC-LSII of series engines is reinforced, and at the same time, development of the UEC52LSE type engine is underway as the latest one.
In 1997, development and design of the UEC37LSII to cover the intermediate range between the developed UEC33LSII and UEC43LSII was completed as the line-up reinforcement. The development enables the flexibility by the UEC-LSII series engine for the planning needs of diversified kinds of small ships, and, in particular, extensive demand on UEC37LSII is expected around the main engine for ships engaged in domestic waters. The UEC52LSE type engine whose development is just started is designed for higher output and miniaturization compared with the LSll type engine, and has the top level specifications as the large low-speed 2-cycle engine of 19 bar in brake mean effective pressure and 8.5 m/s in mean piston speed.
Principal particulars, the output range map, and the section of the UEC-LSII type engine and the UEC52LSE type engine are indicated in Table 2.4.13-1, Fig. 2.4.13-1, and Fig. 2.4.13-2, respectively.
On the other hand, as the Mitubishi-Sulzer engine, the first model of 7RTA58T engine which is the latest model was completed in December, 1997, and the 12RTAg4C-UG type engines as the main engine for large high-speed container carriers have been continuously manufactured.
(2) Annual results of manufacture
* Main engine for marine use：
Large engine： 38 sets 1,069,210 PS
Medium/small engine： 7,546 sets 4,068,250 PS
* Auxiliary engine for marine use： 1,598 sets 834,630 PS
