Wärtsilä Solutions for Marine and Oil&Gas; Markets 2013
Wärtsilä Solutions for Marine and Oil&Gas; Markets 2013
Wärtsilä Solutions for Marine and Oil&Gas; Markets 2013
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LOW-SPEED ENGINES<br />
Exhaust gas<br />
economizer<br />
Steam<br />
turbine<br />
Ship service steam<br />
Ship service power<br />
Turbochargers<br />
Motor/generator<br />
Exhaust<br />
turbine<br />
Aux. engines<br />
Main engine<br />
Schematic of a High-Efficiency Waste Heat Recovery plant typical <strong>for</strong> large<br />
container ships.<br />
High-Efficiency Waste Heat<br />
Recovery (WHR)<br />
Waste heat recovery is an effective technology <strong>for</strong> simultaneously<br />
cutting exhaust gas emissions <strong>and</strong> reducing fuel consumption. High-<br />
Efficiency Waste Heat Recovery plants can be installed with Wärtsilä<br />
engines. This enables up to 12% of the main engine shaft power to<br />
be recovered as electrical power <strong>for</strong> use as additional ship propulsion<br />
power <strong>and</strong> <strong>for</strong> shipboard services. These WHR plants thus cut exhaust<br />
gas emissions <strong>and</strong> deliver fuel savings of up to 12%.<br />
Steam based WHR has already been successfully fitted in several<br />
installations to Wärtsilä RT-flex low-speed marine engines. In the WHR<br />
plant, a turbo-generator combines input from a steam turbine <strong>and</strong> an<br />
exhaust gas power turbine to generate electrical power, while steam<br />
from the economiser is available <strong>for</strong> ship service heating. Steam based<br />
WHR is recommended <strong>for</strong> vessels with high installed power.<br />
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