| 摘要 |
PURPOSE:To reduce the amount of air polluting substances produced at the time of low-load operation of a gas turbine, by employing such an arrangement that air is supplied, during the period from starting of the gas turbine and to its idling operation, to a combustion chamber after preheating a portion of air introduced into a main combustor and heating the linear wall by the preheated air. CONSTITUTION:At the time of idling operation, pilot fuel P is supplied to a pilot buner section 10 via a valve 15 and burnt at the pilot burner 10, so that air drawn from air ports 14 is mixed with combustion gas in a mixing section 11 and preheated by the same. The preheated air is introduced into a main combustion chamber 2 via a swirler 7 and primary air ports 4, while heating a liner 3 at the same time. Since this results in promotion of fuel voporization, generation, of THC (total hydrocarbons) and CO can be reduced. On the other hand, when the gas turbine enters into the rated operation, water W is injected into the pilot burner 10 via the valve 15 for stopping combustion of fuel, and atomized water is introduced into the main combustion chamber 2, so that the temperature of main combustion gas is lowered. Thus, it is enabled to minimize generation of NOx. |
