Triality concept

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Blohm + Voss Dock10 Port of Hamburg 2.jpg
System for ballast water treatment
Section of an oil tanker

In January 2011 the concept of an environmentally friendly oil tanker was presented. In this concept study, the tanker is powered by liquefied natural gas . Due to the design, no ballast water is required, and the gases and vapors escaping from the cargo are captured and used.

background

The concept study was prepared and published by the classification society Det Norske Veritas (DNV) in order to show the shipyards and shipowners optimization measures.

Lower drive power and lower emissions

Compared with a conventional today VLCC -Öltanker the drive by the novel shape and is intended to design the use of two dual-fuel engines, approximately 20% (g / kWh) less fuel consumed and by the use of LNG 30% less carbon dioxide are discharged. The auxiliary diesels for driving the generators should work like the two main diesels as dual-fuel engines with two fuels (LNG and marine gas oil [MGO] ). The LNG fuel tanks required for this were arranged in this concept study on the back of the deck, directly in front of the bridge house. The auxiliary boiler uses cargo vapors as fuel that escape and are collected during the loading and return voyages.

Return trip without ballast water

The complete waiver of ballast water , which today's tankers need for empty journeys, is to be made possible by a new V-shaped hull shape to avoid slamming damage and a constructive tank arrangement. The choice of two drive motors and two propellers enables small propeller diameters, which prevents the propellers from submerging when driving empty. Since the new ballast water convention of the IMO will soon come into force, the expensive ballast water treatment system that will then be required can be avoided without the use of ballast water. Since the amounts of ballast water previously required, which are carried in so-called “clean ballast tanks”, are not insignificant, these tanks are saved. The lower draft on the return journey due to the avoidance of ballast water also requires a lower drive power, which reduces the fuel requirement.

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