マリンエンジニアリング
Online ISSN : 1884-3778
Print ISSN : 1346-1427
ISSN-L : 1346-1427
44 巻 , 6 号
選択された号の論文の23件中1~23を表示しています
随想
技術資料
  • 宮野 春雄, 中谷 博司
    2009 年 44 巻 6 号 p. 853-858
    発行日: 2009年
    公開日: 2012/10/25
    ジャーナル フリー
    Revision of MARPOL 73/78 Annex VI was adopted (resolution MEPC.176(58)) at the IMO MEPC 58 (October 2008), and the framework for the regulation of future sulphur reduction was decided. By 2025 at the latest, the global maximum sulphur content in marine fuel oil will be reduced to less than or equal to 0.5 %m/m. Aside from the phased reduction of sulphur, IMO is considering whether other fuel properties need to be controlled. The effects of the reduction of sulphur in fuel oil have already been felt, and with future step-by-step sulphur reduction, there is concern that these effects will aggravate. Therefore, it is necessary to pay due attention to the changing circumstances regarding marine fuel oil with a wider perspective.This report mainly describes the situation to date of fuel oil standards and marine fuel oil properties.
解説
技術資料
解説
技術資料
  • Aabo Kjeld, Sejer Laursen Rene
    2009 年 44 巻 6 号 p. 876-887
    発行日: 2009年
    公開日: 2012/10/25
    ジャーナル フリー
    This paper introduces the latest development and technical explanation of ME-GI dual fuel two-stroke engines and gas fuel supply system for gas application on LNG/LPG carriers and marine vessels in general.In cooperation with well-known and experienced gas handling partners, MAN Diesel offers safe and reliable high-efficient prime movers for LNG carriers.By optimising the engine and gas supply systems using state-of-the-art technology, in cooperation with our gas system partners, we have actively lowered investment and operational costs, and generally improved system efficiency. Thereby, a positive effect has been achieved on the total fuel consumption as well as the overall environmental impact on the surroundings.
  • Aabo Kjeld
    2009 年 44 巻 6 号 p. 888-893
    発行日: 2009年
    公開日: 2012/10/25
    ジャーナル フリー
    Due to the existing and coming environmental legislation on fuel sulphur contents MAN B&W two-stroke engines will increasingly operate on distillate fuels, marine gas oil (MGO) and marine diesel oil (MDO), in such areas where demanded.MAN B&W two-stroke engines are optimised to operate on heavy fuel. The MGO / MDO fuels can be used, however, some individual considerations on the Engine and fuel system have to be done to ensure safe and reliable performance.Traditionally, the lowest viscosity suitable for large marine diesels has been set at 2 cSt at engine inlet, however experience has shown us that the most reliable performance is achieved with viscosities above 3 cSt at engine inlet.Fuels with a specified viscosity of minimum 2 cSt at 40 deg C can be used, however as many factors influence the performance operating on fuels in the low viscosity range, MAN Diesel believes that fuels with a viscosity of 3 cSt at 40 deg C hold the sufficient margin for safe and reliable engine performance
解説
技術資料
解説
技術資料
  • 佐々木 千一
    2009 年 44 巻 6 号 p. 911-916
    発行日: 2009年
    公開日: 2012/10/25
    ジャーナル フリー
    In LNG carriers, a part of the cargo is converted to boil-off gas due to heat from the open air and ship motions. Steam turbines have been predominantly used for current propulsion systems of LNG carriers, because this boil-off gas can be used as fuel for boilers. However, in recent years the number of electric propulsion systems using dual-fuel diesel generator engines has increased as an alternative to steam turbine systems. Last November, NIPPON KAIJI KYOKAI (ClassNK) issued the "Guidelines for Dual-Fuel Diesel Engines". These guidelines describe the construction and applicable rules for dual-fuel diesel engines. The IGC Code and Chapter 16, Part N of the Society's Rules prescribe the requirements that apply to dual-fuel diesel engines on the "Use of cargo as fuel". Furthermore, "Annex 3" and "Annex 4", Part N of the Guidance to the Society's Rules describe the requirements in detail for dual-fuel diesel engines. This paper gives an overview of the Guidelines mentioned above.
解説
技術資料
論文
  • 高瀬 秀樹, 吉原 大佑, 高田 洋吾, 脇坂 知行
    2009 年 44 巻 6 号 p. 934-940
    発行日: 2009年
    公開日: 2012/10/25
    ジャーナル フリー
    Bio gas fueled engines have proved effective in helping the environment; such as reducing methane gas which has a large greenhouse effect, alongside an ozone layer destructing effect, because the main composition of bio gas is methane, and it is not emitted into the atmosphere, but burned up within the engine. In this study, by combining the GRI-Kojima reduced elementary reaction scheme and the DME reduced elementary reaction scheme, which had been constructed by the authors' group, the authors constructed a reduced elementary reaction scheme originally for the mixture of bio gas, city gas, DME and air for investigating the combustion characteristics of a bio gas and city gas mixture fueled engine which was ignited with DME (dimethyl ether) spray. On the basis of chemical kinetics with the proposed elementary reaction scheme, the authors conducted three-dimensional numerical analysis of the combustion process within a practical computation time in a bio gas and city gas mixture fueled engine which was ignited with a small amount of DME spray, using different mixture ratios of bio gas and city gas.
  • 表 洪志, 中園 徹, 高田 洋吾, 脇坂 知行
    2009 年 44 巻 6 号 p. 941-946
    発行日: 2009年
    公開日: 2012/10/25
    ジャーナル フリー
    Dimethyl ether (DME) is one of the most promising alternative fuels for the near future. For rapid spread, it is desirable to use the mixture of DME with LPG (mainly propane), because a mature supply infrastructure already in existence can be employed. However, using the mixture of LPG and DME as a fuel for a spark ignition engine causes a problem, knocking during combustion. In a previous study, the authors analyzed this knocking phenomenon in a small gas engine for co-generation system by means of a three-dimensional combustion simulation based on a chemical kinetic model, and investigated the effect of combustion chamber shape on the knocking phenomenon. However, due to long computational time, it was difficult to evaluate various piston cavity shapes under the wide range of operating conditions. Therefore, in this study, the authors have investigated the effects of those piston cavity shapes on engine performance, especially on knocking limits by experiments under the wide range of operating conditions in the same engine, and have explored a suitable piston cavity shape for LPG-DME mixture fuel with high ratio of DME.
技術資料
論文
事業所紹介
入門コーナー
シニアサロン
feedback
Top