Details are 805 units of VTR/VTC type with axial turbine, 2006 units of RU/RH type with radial turbine and 2 units of TPS type with radial turbine. The requirement of the turbochargers for high-pressure ratio and high thermodynamic efficiency is increasing. The newly developed TPS61E type turbocharger contributed for increasing power and efficiency of the diesel engine, by its high pressure ratio up to 4.5 and high efficiency above 66% at normal operating condition.
[Takashi AKITA]
5. Boilers
5.1 General
The number of production of boilers for marine use has been on the gradual decrease with the peak in 1990, but in 1995, the number of production was increased by approximately 30 compared with that in 1994, and the brakes were once put on the decrease. Thereafter, the number of production shows the level-off trend, and in 1997, the total number of production again shows the trend of increase. In 1998 fiscal year, 437 boilers were produced, which was about 92% to that in 1997 fiscal year.
In the technological aspect, researches and developments have been continuously achieved in energy saving, labor saving, low-grade fuel, waste oil disposal, exclusive and mixed combustion of gas/heavy oil including the gas fired auxiliary boiler, and countermeasures for the air pollution by NOx, SOx, etc., and the necessity for the researches and developments is intensified from the viewpoint of the global environment protection.
In particular, in 1998 fiscal year, a variety of discussions have been made focusing on the countermeasures for low quality and degradation in fuel oil for marine use, and the review of the international standards on the fuel oil for marine use to meet the actual condition, including the field of the system for the marine engines, and the field of the shipbuilding, the manufacture engines and equipment, the manufacture of fuel oil, the treatment of fuel oil, and ship operation.
5.2 Number of Production
Fig. 5.1 and Fig. 5.2 show the production of boilers for marine use during 11 years since 1988 which are summarized in “Statistics of Products in Marine Industry” by the Ministry of Transport.
Fig. 5.1 Boiler Production by Annual Report of Marine Industrial Statistics
Fig. 5.2 Boiler Production by Annual Report of Marine Industrial Statistics
Fig. 5.1 shows the member of production of boilers by the kind, and the total number of production of boilers for marine use (main boilers + auxiliary boilers) has been on the gradual decrease with the peak in 1990, while in 1995, the number of production was increased by approximately 30 compared with that in 1994, once putting the brakes on the decrease. Thereafter, the number of production has shown the level-off condition, and in 1997, the total number of production shows the trend of increase again.
Fig. 5.2 shows the weight of production to the number of production of boilers by the kind, and the weight statistics shows the trend that the boilers have been increased in size since 1997 fiscal year.
5.3 Major Trend
5.3.1 Main Boiler
For the main boilers of LNG carriers in 1998 fiscal year, 8 sets of boilers of 68T/H for Korean industry, 2 sets of 46T/H boilers and 2 sets of 21T/H boilers for Japanese industry were manufactured by MHI, and similar to 1997, 4 sets of 54T/H boilers were manufactured by MES, and 8 sets of 68T/H boilers were manufactured by KHI, totaling 24 sets of boilers, which is a relatively large number of production of main boilers. MHT received orders of 2 sets of 60T/H.
