23-05-2012, 12:28 PM
MODERN PRACTICE IN MARINE DIESEL ENGINES
MODERN PRACTICE IN MARINE DIESEL ENGINES.ppt (Size: 1.02 MB / Downloads: 136)
INTRODUCTION
This paper will outline the advantage of the new technology in the ME range of engines by combining traditional ,proven technologies with enhanced electronic control so as to design engines which, while being both
production-friendly and
operationally easy to handle,
yet will provide all benefits to the owner and operator of contemporary and future software achievements
Existing Engines
Camshaft-controlled diesel engines have been
the state of the art ever since the birth of
reciprocating machinery and have been refined
and developed ever since. However, a mechanical cam is fixed once made and, in spite of
various mechanical and hydraulic add-on
devices like VIT, etc., timing control possibilities
are limited with mechanical cams. And
fuel injection pressure control and variation over
the load range have limitations with a cam controlled
engine.
IMPORTANCEOF EC-ENGINES
The introduction of the electronically controlled
camshaft-less low speed diesel engines, which is
now gaining momentum, is a milestone in diesel
technology that deserves a place in history like
Rudolf Diesel’s first engine in Augsburg.
The 1912 motor vessel Selandia.
The introduction of turbocharging on two-stroke diesels in 1954.
And the first SCR (Selective Catalytic NOx
Reduction) systems on ships in 1989.
The main components of the Hydraulic Power Supply unit are the following:
• Self cleaning filter with 10-micron filter mesh • Redundancy filter with 25-micron filter mesh • Start up pumps: High-pressure pumps with supply pressure of 175 bar Low-pressure pumps for filling the exhaust valve push rod with supply pressure of 4 bar • Engine driven axial piston pumps supplying high pressure oil to the Hydraulic Cylinder Unit with oil pressures up to 250 bar