| 摘要 |
A method and apparatus for controlling combustion in a gas engine connected to an electric generator to compose a power generator unit, the unit being installed near a coal mine site, the gas engine being of a pilot ignition type gas engine which can utilize recovered methane gas and ventilation air methane gas taken out from the coal mine as its fuel by adjusting methane concentration to produce lean air-methane gas mixture are provided. With the method and apparatus, gas engine output torque is controlled so that a relation of |DeltaTd|-|DeltaTs|>0 is maintained between |DeltaTd| which is absolute value of change rate of load torque Td required to drive the generator in relation to engine rotation speed and |Delta Ts| which is absolute value of change rate of output torque Ts in relation to engine rotation speed at an intersection of torque curves, and excess air ratio is controlled to be 2 or larger so that lean mixture burning is performed while evading occurrence of misfire and knock by controlling mixing ratio of recovered methane gas with ventilation air methane.
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