Gas engine, method for operating a gas engine and generator set

A method for operating an internal combustion gas engine, wherein,

• the internal combustion gas engine comprises at least one engine cylinder arrangement, a first compressor configured for compressing a gaseous fuel and air mixture, a second compressor configured for compressing a gaseous medium, and a pressure reducer;
• wherein the at least one cylinder arrangement defines a combustion chamber comprising an intake arrangement for intake of charge gas into the combustion chamber, a sparkplug, and a pre-chamber arranged in connection with the combustion chamber and with the sparkplug, wherein
• the method comprises steps of:
• conducting a rich gaseous fuel mixture from an outlet of the first compressor to the pre-chamber;
• mixing a lean gaseous fuel mixture by blending the rich gaseous fuel mixture from an outlet of the first compressor with the gaseous medium from an outlet of the second compressor;
• reducing a pressure of the lean gaseous fuel mixture in the pressure reducer;
• and
• conducting the lean gaseous fuel mixture as a charge gas to the intake arrangement.