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First and second premixed burners having annular injection slots are concentrically adjacent and the injection slots are substantially aligned with each other in a longitudinal direction of the burners. A pilot burner is provided substantially in the center of the annular first premixed burner so th

First and second premixed burners having annular injection slots are concentrically adjacent and the injection slots are substantially aligned with each other in a longitudinal direction of the burners. A pilot burner is provided substantially in the center of the annular first premixed burner so that the injection slot of the pilot burner is substantially aligned with the injection slot of the first premixed burner in a longitudinal direction of the burner. A flame holder which forms a circulating flow of combusted gas Gh downstream of the flame holder is disposed at the downstream end of a boundary wall between the premixed burners so that the flame holder is co-used by the premixed burners. Flow rate adjusting means for adjusting the flow rate of fuel supplied to the first, second premixed burner and the pilot burner, respectively are provided. The fuel can be substantially uniformly mixed with a combustion gas. Reduction in NOx and stabilization of premixed flame can be achieved.

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1. A combustor system having a plurality of premixed burners which jet out a premixed gas of a fuel and air from an injection slot in a predetermined direction with respect to an upstream and downstream side of a flow of gas for combustion of the premixed gas, the combustor system comprising: a f

1. A combustor system having a plurality of premixed burners which jet out a premixed gas of a fuel and air from an injection slot in a predetermined direction with respect to an upstream and downstream side of a flow of gas for combustion of the premixed gas, the combustor system comprising: a flame holder for forming a circulating flow in a downstream side of said flame holder, said circulating flow being formed by a part of a combusted gas generated by said combustion of the premixed gas to return a part of the combusted gas from the downstream side to the upstream side which part of the combusted gas would otherwise flow from the upstream side to the downstream side; a fuel flow rate adjusting means for adjusting a flow of a fuel to be supplied to each of the plurality of premix burners, wherein said plurality of premix burners each have an injection slot arranged adjacent to and aligned with an injection slot of another burner in said predetermined direction, and wherein said flame holder is disposed at a boundary between two adjacent premix burners, at one of an equal level or further downstream than the positions of said injection slots in order that the flame holder may be utilized by the premixed burners for forming said circulating flow with respect to each of the combusted gases jetted from the respective premix burners. 2. A combustor system having a plurality of premixed burners which jet out a premixed gas of a fuel and air from an annular injection slot in a predetermined direction either upstream or downstream with respect to a flow of the gas for enabling a combustion of the premixed gas, the combustor system comprising: a flame holder for forming a circulating flow in a downstream side of said flame holder, said circulating flow being formed by a part of a combusted gas generated by said combustion of the premixed gas to return a part of the combusted gas from the downstream side to the upstream side, which part of combusted gas would otherwise flow from the upstream side to the downstream side; a pilot burner having an injection slot for jetting the fuel; a fuel flow rate adjusting means for adjusting a flow rate of the fuel to be supplied to each of said plurality of premix burners and to said pilot burner, wherein said plurality of premix burners each have an injection slot formed concentrically and annularly and are adjacent to other injection slots having the same central axis and being aligned with the other injection slots in said predetermined direction, said injection slot of said pilot burner is disposed on said axis and the injection slot is aligned with injection slots of the premixed burners in the predetermined direction, and wherein said flame holder is formed annularly corresponding to configurations of said injection slots of the premixed burners, and said flame holder is disposed at a boundary between two adjacent premix burners, at one of an equal level or further downstream than positions of said injection slots, in order that the flame holder may be co-used by the premixed burners for forming said circulating flow with respect to each of the combusted gases generated by the combustion of premixed gases jetted from the respective premixed burners. 3. A combustor system as defined in claim 1, further comprising a NOx measuring sensor for measuring the concentration of the NOx in combusted gas generated by combustion of said fuel, and wherein said flow rate adjusting means is adapted to change the flow rate of the fuel supplied to each of said burners in dependence upon the NOx concentration measured by said NOx measuring sensor. 4. A combustor system as defined in claim 2, further comprising a NOx measuring sensor for measuring the concentration of the NOx in combusted gas generated by combustion of said fuel, and wherein said flow rate adjusting means is adapted to change the flow rate of the fuel supplied to each of said burners in dependence upon the NOx concentration measured by said NOx measuring sensor. 5. A gas turbine system comprising a combustor system as defined in claim 1, wherein a gas turbine is driven by the combusted gas emitted from said combustor. 6. A gas turbine system comprising a combustor system as defined in claim 1, wherein a gas turbine is driven by the combusted gas emitted from said combustor. 7. A gas turbine system comprising a combustor system as defined in claim 4, wherein a gas turbine is driven by the combusted gas emitted from said combustor.