Abstract: A gas combustor has a peripheral premix burner, and a central diffusion burner whose nozzle defines an eccentric first channel housing an ignition device, an axial second channel, and a third channel interposed radially between the first and second channel; the gas combustor is controlled, at a first start-up step, to keep the peripheral burner off and to feed a fuel gas stream along the third channel; at a second step, after a given load is exceeded, the peripheral burner is activated, and the gas stream in the central burner continues to be fed along the same channel as at the first step, and is regulated to reduce its flow to a value greater than zero.

Abstract: A gas combustor has a peripheral premix burner, and a central diffusion burner whose nozzle defines an eccentric first channel housing an ignition device, an axial second channel, and a third channel interposed radially between the first and second channel; the gas combustor is controlled, at a first start-up step, to keep the peripheral burner off and to feed a fuel gas stream along the third channel; at a second step, after a given load is exceeded, the peripheral burner is activated, and the gas stream in the central burner continues to be fed along the same channel as at the first step, and is regulated to reduce its flow to a value greater than zero.