To provide a gas engine capable of sufficiently reducing NOx.
This gas engine is provided with a main combustion chamber 16 formed in a cylinder 13 to obtain a driving output by burning the lean gas supplied from the outside, an auxiliary combustion chamber 18 communicating with the main combustion chamber 16 to ignite with the pressure by injection of the pilot fuel P, and a water injection means 24 for injecting water to lower the combustion temperature of the main combustion chamber 16. When burning the fuel gas in the main combustion chamber 16, the water injection means 24 injects water to lower the combustion temperature of the main combustion chamber 16 to sufficiently reduce NOx to be generated by a rise of the combustion temperature.
TSUJISAKI RYOSUKE
ITAGAKI HIROTO
ITO SHIGERU
Seiichi Otsuka