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The newest NOx reduction technology developed by Wärtsilä is called Wetpac humidification. The principle of Wetpac humidification technology is to introduce pressurized water into the combustion process to reduce NOx formation. The pressurized water is added to the intake air after the turbocharger. The water evaporates immediately, due to the high temperature of the compressed air, and enters the cylinders as steam, thus lowering the combustion temperatures and the formation of NOx. The NOx reduction is up to 50%, and the water consumption is about two times the fuel oil consumption.
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