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Volume 33, Issue 5
Displaying 1-9 of 9 articles from this issue
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[in Japanese]1998 Volume 33 Issue 5 Pages 317-318
Published: May 01, 1998
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSDownload PDF (303K) -
[in Japanese]1998 Volume 33 Issue 5 Pages 319-324
Published: May 01, 1998
Released on J-STAGE: May 31, 2010
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Yasutomo Izumi, Hiroshi Kushiyama1998 Volume 33 Issue 5 Pages 325-331
Published: May 01, 1998
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSThis paper describes the measuring results of main engine exhaust gas NOx emission change with operating condition.
The measuring was carried out for three different conditions, namely shop test, sea trial and in-service conditions, with same engine for total ten (10) engines on total nine (9) vessels (including one vessel with twin engines) during three (3) years.
The measuring method was unified for a pending draft at ISO working group, also comparisons with different measuring points and different NOx analysis instruments had been examined.View full abstractDownload PDF (775K) -
Nobuyoshi Nakayama, Hisashi Yamashita, Kenrou Ueshima, Yoshimasa Araho ...1998 Volume 33 Issue 5 Pages 332-339
Published: May 01, 1998
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSThe reduction of harmful substances such as nitrogen oxides (NOx), sulfur oxides (SOx), and Dusts contained in the exhaust gas from marine diesel engines is a global issue.
Authors have carried out a deNOx pilot system operation test on an actual ship to investigate deNOx characteristics including (1) .aging effect of deNOx performance, (2) .determination of the cause of catalyst deterioration and (3) .load fluctuation following characteristics.
As a result of about 6000 hours operation test, the technology to attain more than 90% reduction of NOx has been established, with urea/water solution being as a reducing agent.View full abstractDownload PDF (5960K) -
Koichi Tanabe, Isao Honda, Masaki Otani1998 Volume 33 Issue 5 Pages 340-345
Published: May 01, 1998
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSThe examinations of NOx reduction are investigated on 3 cylinder test engine that has same dimensions as the commercial engines for marine use except number of cylinders, in order to comply with IMO Regulation No.13 only with modifications of engine design factors without using special devices such as SCR, EGR, emulsion fuel injection and so on.
The test contents followings; verified number of injection holes of fuel atomizers, retarded fuel injection timming, increase of compression ratio and charged air pressure, reduced overlap period of exhaust and inlet valve opening, retarded inlet valve closing timming and adoption of fuel pump planger with retarded fuel injection timming in low loads.
We have accomplished reductions by half of NOx E3 value and it seems there is good prospect of satisfying IMO Regulation No. 13 on commercial engines, in combination of constant combustion pressures with the tested design factors without deterioration of smoke, exhaust gas temperatures and fuel oil consumptions.View full abstractDownload PDF (738K) -
—Combination of F.O. Timing Retard and Compression Ratio Rising—Norio Takeuti, Katsutoshi Ishii, Mitugu Kimura, Katsushi Sasaki, Toshi ...1998 Volume 33 Issue 5 Pages 346-352
Published: May 01, 1998
Released on J-STAGE: December 08, 2010
JOURNAL FREE ACCESSNOx concentration is greatly influenced by combustion flame temperature and its stay time. Fuel injection timing retard avoids a remarkable rise of combustion flame temperature, and is effective in reduction of NOx concentration. Moreover there is no necessity for the special external equiment with this method, which is generally adopted with great effect for expense. However, fuel injection timing retard will bring about an increase of SFOC with a fall of the combustion maximum pressure, and it is usually reported that SFOC will increase by 3% when NOx concentration decreases by 20% with the above method.
At the first stage, we examined fuel injection timing retard with an aim at reduction of NOx concentration, and at the next stage, examined a rise of compression ratio with an aim at improvement for SFOC increase and exhaust gas temperature increase caused by fuel injection timing retail.View full abstractDownload PDF (699K) -
[in Japanese]1998 Volume 33 Issue 5 Pages 353-363
Published: May 01, 1998
Released on J-STAGE: May 31, 2010
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[in Japanese]1998 Volume 33 Issue 5 Pages 364-373
Published: May 01, 1998
Released on J-STAGE: May 31, 2010
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Koji Takasaki, Tadashi Fukuyoshi, Shigenobu Abe, Shin-nosuke Osafune1998 Volume 33 Issue 5 Pages 374-380
Published: May 01, 1998
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSBunker fuel oil, which mainly consists of residue from crude oil refining process, is commonly used for stationary and marine diesel engines. In spite decreasing quality of bunker fuel oil during last years, higher combustion efficiency and lower emission must be achieved. Up to today, ignition quality was the only criterion for combustion characteristics of such fuels. Therefore, contrary to gas oil, formation of the fuel spray and combustion process were not examined in detail. These are clarified in this paper, based on results from engine trials and visualization of fuel spray combustion. Further, methods to improve combustion are discussed.View full abstractDownload PDF (8595K)
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