Techniques for Low NOx Combustion on Medium Speed Diesel Engine

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  • 中速ディーゼル機関の低NOx燃焼技術
  • チュウソクディーゼル キカン ノ テイNOx ネンショウ ギジュツ

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Abstract

Techniques for low NOx combustion without degrading the specific fuel consumption were developed for the medium speed diesel engine. First concept for low NOx is the reduction of high temperature combustion zone. Owing to this concept, the high-temperature combustion flame zone is reduced by the injection direction near to the piston surface. Second concept for low NOx is the reduction of the flame temperature owing to the quick mixing of the high-temperature combustion zone and the low-temperature air portion. It is necessary to obtain the air motion which has the quick mixing of combustion zone and air portion. The air motion adopted in this study was the intake swirl induced by the intake valve with shroud. The medium speed engine with a bore of 280mm was used in the application of the new techniques for reducing NOx emission. The engine based on the low NOx techniques has the decrease in NOx emissions by 40 % and almost the same specific fuel consumption compared with the base engine.

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