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Development of HCCI natural gas engines / Kazunobu Kobayashi in Journal of natural gas science and engineering, Vol. 3 N° 5 (Octobre 2011) 

Public ISBD [article]  in Journal of natural gas science and engineering > Vol. 3 N° 5 (Octobre 2011) . - pp. 651–656 Titre : Development of HCCI natural gas engines Type de document : texte imprimé Auteurs : Kazunobu Kobayashi, Auteur ; Takahiro Sako, Auteur ; Yoshimi Sakaguchi, Auteur Année de publication : 2012 Article en page(s) : pp. 651–656 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Gaseous  fuel  HCCI  Internal  combustion  engine  CHP  Natural  gas Résumé : The possibility of turbocharging into a natural gas homogeneous charge compression ignition (HCCI) engine is experimentally investigated. Experiments are performed using a naturally aspirated engine fitted with an external supercharger and a butterfly valve for back pressure control to simulate a turbocharger. The results indicate that the thermal efficiency can be improved by raising the engine compression ratio and lowering the boost pressure. At an engine compression ratio of 21 and turbocharging pressure of 0.19 MPa, the brake thermal efficiency reaches 43%, with NOx emissions of only 10 ppm or less. Finally, the performance of the engine fitted with a newly developed turbocharger is demonstrated. As a result, 43.3% brake thermal efficiency, 0.98 MPa brake mean effective pressure, and 13.8 ppm NOx emission have been realized. This value shows the possibility that a power generating efficiency of 40% at a power output of 50 kW could be achieved when applied to combined heat and power (CHP), even allowing for energy losses in the generator and the power inverter. For practical use, the ignition timing control, operation control, including how to start or load input and ensuring durability, remain to be investigated. To clarify these issues, we have initiated the endurance test for a newly developed 25 kW HCCI package, although the engine is not supercharged. ISSN : 1875-5100 En ligne : http://www.sciencedirect.com/science/article/pii/S1875510011000722 [article] Development of HCCI natural gas engines [texte imprimé] / Kazunobu Kobayashi, Auteur ; Takahiro Sako, Auteur ; Yoshimi Sakaguchi, Auteur . - 2012 . - pp. 651–656. Génie Chimique Langues : Anglais (eng) in Journal of natural gas science and engineering > Vol. 3 N° 5 (Octobre 2011) . - pp. 651–656 Mots-clés : Gaseous  fuel  HCCI  Internal  combustion  engine  CHP  Natural  gas Résumé : The possibility of turbocharging into a natural gas homogeneous charge compression ignition (HCCI) engine is experimentally investigated. Experiments are performed using a naturally aspirated engine fitted with an external supercharger and a butterfly valve for back pressure control to simulate a turbocharger. The results indicate that the thermal efficiency can be improved by raising the engine compression ratio and lowering the boost pressure. At an engine compression ratio of 21 and turbocharging pressure of 0.19 MPa, the brake thermal efficiency reaches 43%, with NOx emissions of only 10 ppm or less. Finally, the performance of the engine fitted with a newly developed turbocharger is demonstrated. As a result, 43.3% brake thermal efficiency, 0.98 MPa brake mean effective pressure, and 13.8 ppm NOx emission have been realized. This value shows the possibility that a power generating efficiency of 40% at a power output of 50 kW could be achieved when applied to combined heat and power (CHP), even allowing for energy losses in the generator and the power inverter. For practical use, the ignition timing control, operation control, including how to start or load input and ensuring durability, remain to be investigated. To clarify these issues, we have initiated the endurance test for a newly developed 25 kW HCCI package, although the engine is not supercharged. ISSN : 1875-5100 En ligne : http://www.sciencedirect.com/science/article/pii/S1875510011000722