Mitsubishi Heavy Industries (MHI) has developed a new gas engine which is an improved version of the existing MACH-30G. The new model MACH II-SI is not only energy-efficient but also eliminates the need for auxiliary liquid pilot fuel such as light oil. It adopts a Spark Ignition (SI) system that eliminates the need for auxiliary liquid pilot fuel such as light oil.

In developing MACH II-SI, MHI focused on further enhancement of the efficiency leveraging its abundant experience accumulated in its existing engines. As a result, the new engine has achieved efficiency – combining power generation and heat energy recovery via steam of 66.1%, the world's highest level among 6,000 kilowatts (kW) class engines, in which electric power generation efficiency has been improved by 1 percentage point.

MHI expects the MACH II-SI series, with power output ranges from 3,650 kW to 5,750 kW, will significantly contributes to increasing needs for CO2 emission reduction.

To enhance overall efficiency, MHI focused on enhanced heat recovery in steam generation and effective utilization of exhaust gas energy. The company also has shortened lead-time to reach full load after engine start by 50%, which contributes to enhance load-following capability. In order to boost power generation efficiency, MHI redesigned the combustion chamber, including the cylinder cover and piston. By optimizing formulation of the fuel-air mixture, as well as improving the pre-chamber's shape and fuel-air mixture ratio, the company has raised combustion efficiency and reduced thermal loss.

 

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