In recent years, the number of abnormalities with marine diesel engines, which are caused by the poor quality of fuel oil, has been steadily increasing. In particular, abnormal wear of the piston rings and the cylinder liners of the diesel engine causes serious problems for the safety and reliability of the vessel. In such a situation, the role of the onboard fuel oil pre-treatment system is becoming significantly important. The actual capability of the fuel oil pre-treatment system was investigated and a suitable pre-treatment method of fuel was studied. The test plant of a fuel oil pre-treatment system (5 m x 2 m x 3 m height) that simulated the on-board system was assembled on our shore facility. Heavy fuel oils that were actually used on-board were provided for this investigation, and in some cases test dust, sludge from an on-board fuel oil pre-treatment system, water etc. were added to fuel oil if needed. Our investigation result shows as follows: 1) The capability of the pre-treatment system was influenced by fuel oil properties, system arrangements, individual abilities of equipments and machines, operating conditions and operating procedures among others. 2) The maximum separation efficiency of FCC catalyst fines in centrifuge at a single operation was about 85 %. If heavy fuel oil contains an upper limit of FCC catalyst fines defined by ISO 8217 standard (Al + Si 80 mg/kg max), FCC catalyst fines may not be removed sufficiently to the level of the engine manufactures' recommendations (7 to 15 mg/kg) by centrifuge at a single operation. However, the maximum separation efficiency of FCC catalyst fines was increased to about 95 % by a series operation of the centrifuges. 3) Homogenizer decreased a small amount of the total sediment in the heavy fuel oil. The homogenizer decreased the water separation efficiency of centrifuges and slightly improved the FCC separation efficiency of the centrifuge, when it was equipped at the inlet of the centrifuge. The useful results concerning the performance and operation methods of the pre-treatment system were obtained by examination. In order to prevent the engine troubles resulting from the degrading quality of fuel oils, we wish to utilize the result for improvement in the design of the on-board pre-treatment system and an improvement in the operation method.


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    Title :

    Actual capability of shipboard fuel oil pre-treatment systems


    Additional title:

    Aktuelle Leistungsfähigkeit von Heizöl-Vorbehandlungssystemen auf Schiffen


    Contributors:


    Publication date :

    2004


    Size :

    9 Seiten, 15 Bilder, 4 Tabellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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