Advantages of Closed Crankcase Ventilation for Large Engines
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vantages of Closed Crankcase Ventilation for Large Engines Large combustion engines will continue to be irreplaceable in many applications in the future. However, its environmental compatibility needs to be improved. Crankcase ventilation offers an often underestimated potential here, especially in gas and dual-fuel engines, which are being used more and more frequently. UT99 has developed a closed crankcase ventilation system for large engines, which can make optimum use of its advantages in this engine segment.
INTRODUCTION
Global warming and air pollution pose a major challenge. Manufacturers of internal combustion engines and sup pliers are working on new technolo gies for emissions reduction in order to fulfill political and legal requirements. Research and development are predo minantly concentrating on emissions
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sources, which have a high share in emissions. They absorb the most resources and require a great deal of time. As a result, emissions sources with a lower share are often neglected, although in many cases, existing solu tions can be transferred promptly, cost-effectively and with low expendi ture to large engines – often to the com mon benefit of the environment, manu
facturers, plant manufacturers, ship yards and operators. In order to achieve the climate objec tives of the Paris Agreement of 2015, it will be vital to also have a look at sources that have been relegated to the sidelines thus far. The crankcase ventilation offers such potential for opti mization. The company UT99 develops oil mist separators for crankcase venti
AUTHORS
Remo Oppliger is Chief Executive Officer at UT99 AG in Andelfingen (Switzerland).
Christian Stieler is Customer Engineer Crankcase Ventilation at UT99 AG in Andelfingen (Switzerland).
lation in large engines, which can sig nificantly reduce emissions in power plant, marine, mining and offshore applications. CRANKCASE VENTILATION BASICS
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Due to leaks in turbochargers, pistons and valves, every internal combustion engine requires crankcase ventilation, as it ensures that the emergent blow-by gases are discharged. The blow-by con tains air, oil drops, unburned fuel as well as exhaust gas emissions and hence also substances that are hazardous to the environment and to humans, which among other things, can be attributed to the volatile organic compounds [1]. There are two designs for crankcase ventilation: an open system (Open Crankcase Ventilation, OCV) and the Closed Crankcase Ventilation (CCV). While OCV is quite prevalent in large engines, CCV has been required by law for automobiles for decades now. It is not comprehensible why CCV is not mandatory for large engines.
The few existing emission limits for the crankcase ventilation in large engines are often not obligatory or are vaguely defined. One corresponding guideline is for example the “Environmental Protec tion Agency (EPA) Code of Federal Regu lations Title 40 CFR 63 Subpart ZZZZ (RICE NESHAP) § 63.6625(g), e-CFR data,” in effect since March 08, 20
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