Development of a Late Intake-Valve Closing (LIVC) Miller Cycle for Stationary Natural Gas Engines - Effect of EGR Utilization

972948

10/01/1997

Event
International Fuels & Lubricants Meeting & Exposition
Authors Abstract
Content
The Late Intake-Valve Closing (LIVC) Miller cycle was applied to a turbo-charged stationary gas engine for co-generation. The engine, with a power of 324 kW, was operated under stoichiometric conditions and equipped with a three-way catalyst. The LIVC Miller cycle was aimed to improve the thermal efficiency and lower the exhaust gas temperature by increasing an expansion ratio, while avoiding engine knocking by reducing an effective compression ratio. This part of the study employed an exhaust gas recirculation (EGR) to improve the thermal efficiency of the LIVC Miller cycle engine. The EGR was expected to improve the knocking limit and reduce thermal damage to the engine's exhaust train. The experiments clarified the basic characteristics of EGR and its effect on the performance of the gas engine. The LIVC Miller cycle with EGR operating at stoichiometric conditions demonstrated a high thermal efficiency of 38 % (LHV), rivaling that of existing lean burn gas engines. NOx emissions were maintained extremely low, under 40 ppm (≒0.2 g/kW·h), by using the three-way catalyst.
Meta TagsDetails
DOI
https://doi.org/10.4271/972948
Pages
16
Citation
Okamoto, K., Zhang, F., Shimogata, S., and Shoji, F., "Development of a Late Intake-Valve Closing (LIVC) Miller Cycle for Stationary Natural Gas Engines - Effect of EGR Utilization," SAE Technical Paper 972948, 1997, https://doi.org/10.4271/972948.
Additional Details
Publisher
Published
Oct 1, 1997
Product Code
972948
Content Type
Technical Paper
Language
English