| 摘要 |
PURPOSE:To realize the substantial reduction of the amount of generated NOX and restrict a reduction of an efficiency of a plant to a possible minimum value by a method wherein either steam or water is injected through an injection nozzle at a first stage combustion area to mix and ignite it and premixture gas with a lean fuel is fed to a second stage combustion area at a downstream side of the first stage combustion area. CONSTITUTION:The interior of a combustor chamber 15 is divided into an upstream first stage combustion area A and a second stage combustion area B at a downstream side of the combustion area. An outer wall 20 of a head part of a liner 14 of a combustion unit has a first stage fuel nozzle 23 at its central part, either steam or water vapor header 24 and a second stage fuel header 25 are formed at its outer circumference in substantial concentric manner. A gas turbine combustion unit 10 having a two-stage premixing and combustion system may be operated such that a proper amount of steam (b) is uniformly distributed into the first stage combustion area A, a local high temperature combustion area is prevented from being generated to restrict an occurrence of NOX. It is necessary to make a proper control of a flow rate of first and second stages or a flow rate of steam by a controlling and calculating unit on the basis of each of loads of the gas turbine.
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