Overview of the Gas Engine Used for Test Operation

Model		GS6R2-PTK
Rated Output(Note5)		450kW
Frequency		60Hz
Generating Efficiency		42.0％

• ・When operated using city gas.
• ・This gas engine model was jointly developed by Toho Gas and MHIET.

• 1Based on research by Toho Gas.
• 2Backfiring occurs when the flame flows backward toward the inspired air flow path, resulting in damage to the engine’s intake system. Hydrogen has a smaller minimum ignition energy (MIE) value than city gas, and its burning velocity is faster, making it easier for backfiring to occur compared to single fuel firing with city gas.
• 3Knocking occurs when the ignition timing is too early, or the compression ratio is too high, and the fuel-air mixture self-ignites causing the pressure inside the combustion chamber to rise rapidly, resulting in damage to the engine’s internal components. Hydrogen has a high combustibility compared to city gas, so the cylinder pressure and temperature can easily increase, making it easier for knocking to occur compared to single fuel firing with city gas.
• 4Preignition is when the fuel-air mixture self-ignites prior to ordinary ignition, causing the pressure inside the combustion chamber to rise rapidly, resulting in damage to the engine’s internal components.Hydrogen has a smaller MIE value than city gas, making it easier for preignition to occur compared to single fuel firing with city gas.
• 5The test operations were successfully conducted at the rated output for city gas specifications.