12-10-2010, 01:14 PM
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High Efficiency Miller Cycle Gas Engine
INTRODUCTION
The output of gas engines for cogeneration mainly ranges from 100 to 1 000 kW. The present gas engines are broadly classified in two types: lean-burn system (1) and stoichiometric air-fuel ratio combustion system, with the lower output engines using the stoichiometric Air-fuel ratio combustion system while the medium and large size engines adopting the lean-burn system. The lean-burn system generally features in high generating efficiency and low NOx emission in addition to the excellent endurance of the low-temperature combustion flame.
Mitsubishi Heavy Industries, Ltd. (MHI) and Osaka Gas Co., Ltd. have jointly applied the Miller cycle to a lean-burn gas engine to develop the world’s first gas engine in this class with the generating efficiency standing at 40%. With the 280 kW engine released commercially in April 2000 after having cleared the endurance test over 4 000 hours, this paper describes the main technologies and performance specifications for this engine as well as for the series
of engines planned in the future.
High Efficiency Miller Cycle Gas Engine
INTRODUCTION
The output of gas engines for cogeneration mainly ranges from 100 to 1 000 kW. The present gas engines are broadly classified in two types: lean-burn system (1) and stoichiometric air-fuel ratio combustion system, with the lower output engines using the stoichiometric Air-fuel ratio combustion system while the medium and large size engines adopting the lean-burn system. The lean-burn system generally features in high generating efficiency and low NOx emission in addition to the excellent endurance of the low-temperature combustion flame.
Mitsubishi Heavy Industries, Ltd. (MHI) and Osaka Gas Co., Ltd. have jointly applied the Miller cycle to a lean-burn gas engine to develop the world’s first gas engine in this class with the generating efficiency standing at 40%. With the 280 kW engine released commercially in April 2000 after having cleared the endurance test over 4 000 hours, this paper describes the main technologies and performance specifications for this engine as well as for the series
of engines planned in the future.
