JOURNAL OF THE MARINE ENGINEERING SOCIETY IN JAPAN
Online ISSN : 1884-4758
Print ISSN : 0388-3051
ISSN-L : 0388-3051
Volume 19, Issue 12
Displaying 1-4 of 4 articles from this issue
  • [in Japanese], [in Japanese]
    1984 Volume 19 Issue 12 Pages 936-942
    Published: December 01, 1984
    Released on J-STAGE: May 31, 2010
    JOURNAL FREE ACCESS
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  • Sadahiro Namie, Toshio Osanai, Hiroshi Yamanouchi, Takeyoshi Yokomura
    1984 Volume 19 Issue 12 Pages 943-950
    Published: December 01, 1984
    Released on J-STAGE: May 31, 2010
    JOURNAL FREE ACCESS
    The fluidized bed combustion is expected to have advantages of being adaptable to many kinds of fuels, of being able to make compact in a furnace, , and of improving the thermal efficiency of power plant by raising steam conditions. Hence, its applications to the marine steam power, as well as to the land use, have been investigated.
    In the paper, the effects of a rolling motion of ships on the performance of fluidized bed combustion are investigated experimentally with a small test furnace installed on a rolling frame. Further, the characteristics of the furnace in both cases of oil and coal combustions are obtained and compared with each other.
    The inclination of the furnace raises a variance of temperature distribution in the bed and reduces the boiler efficiency of furnace, where there is no essential difference between the oil and coal combustions. In the rolling motion of the furnace, on the other hand, almost the same boiler efficiency as that in the vertical furnace is obtained in both oil and coal combustions. The fact is owing to a time-averaging effect caused from a large heat capacity of the bed material.
    From these results described above, the fixed inclination is considered to be a critical design condition of the marine fluidized bed furnace. While, the performance of the furnace in actual operations should be influenced only by the components of rolling motion of the ships with a comparatively long period (more than about 10 minutes) .
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  • Takeshi Hashimoto, Toshio Hikima, Hitoshi Kaneko, Yuji Matoba
    1984 Volume 19 Issue 12 Pages 951-963
    Published: December 01, 1984
    Released on J-STAGE: May 31, 2010
    JOURNAL FREE ACCESS
    This third trial mutual relief maintenance model (MODEL H) is a more advanced one which has three modes of intervals Tp (port one) during home port, Tf (unrelieved one), Th (relieved one) within a propelling one Ts (=Tf+Th) and the corresponding three types of manpowers Mp (port relief one), Mf (inherent engines' one; =Ms), Mh (combined one) with a common complement Mc (Mh=Mf+Mc) between decks' and engines' department during Th than MODEL I (24 hours maintenance model) and MODEL II (8 hours one) of [1] ISSOA-'79 Tokyo and MODEL T (total one with home port relief) of [2] MESJ-'82.
    According to some results of GPSS digital simulation [3] with only two input data of occurring rate λ and man-hour per occurrence mh some useful trade-off relationships among many variables of total member MT (=Mp+Mf+Mc) and an equivalent complement ME (TvME=TpMp+TfMf+ThMh) from due to a queuing length L and its rate l corresponding to some residual man-hour (ΔMH) are obtained by an important index of utilization η [4] which satisfies two necessary- and sufficientconditions with an allowable inventory Lc for MODEL H.
    Considering an overtime Ho the statistical results of simulation agree with the concept of theoretical queuing model for mutual system.
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  • 1984 Volume 19 Issue 12 Pages 964-984
    Published: December 01, 1984
    Released on J-STAGE: May 31, 2010
    JOURNAL FREE ACCESS
    Download PDF (2669K)
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