Page 29: of Maritime Reporter Magazine (January 1986)

UPGRADING OF OLDER

ENGINES

As the economic climate has forced ship operators to change their mode of operation, sometimes requiring the vessels to be operated at powers significantly below design levels, the engine manufacturers have responded by designing and making available retrofit packages allowing the operator to optimize the existing engine to the new oper- ating conditions. The most encom- passing of the retrofit packages available involves replacement of pistons and cylinders among other parts of existing standard stroke low-speed engines to convert them to super long-stroke machines rated at a lower power but with improved specific fuel consumption and a bet- ter match between crank/propeller speed and ship hydrodynamics.

Other types of upgrading packages include turbochargers, turbocharger intercoolers and turbocharger by- pass systems designed to upgrade the engines to optimize performance at new-load conditions.

ANCILLARY ENERGY

RECUPERATION SYSTEMS

In attempts to improve on the already phenomenal specific fuel rates of the larger diesel engines and to improve on vessel overall fuel rates, various techniques and sys- tems have been used to recuperate energy from exhaust gases and cool- ing water. The most common of these systems is the waste-heat boil- er supplying steam to turbogenera- tor and/or to various heating loads aboard ship. With the availability of high-efficiency exhaust gas power turbines, it has become possible to extract significantly more energy from the exhaust gas than can be used by the turbocharge blower.

Various engine manufacturers have adopted the exhaust gas power tur- bine to supply the excess power back to the engine shaft with im- provements of 2.5 to 3 percent in specific fuel consumption. Some marine engineers have opted to use the excess exhaust gas energy to drive or assist in driving an electri- cal generator.

The following review will high- light the developments of the prin- cipal diesel engine manufacturers supplying the marine community with propulsion and auxiliary diesel engines.

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