Premixing pipe structure of gas turbine

The invention provides a premixing pipe structure of a gas turbine, which can generate a uniform and fully diluted mixed gas when the mixed gas of combustion gas and air is generated. Air holes (1a1, 1a2, 1a3, 1a4) are formed in a cylindrical housing part (1a) of the premixing pipe (1), and the number of the air holes (1a1) formed on the most upstream side is larger than the number of the other air holes (1a2, 1a3, 1a4). The air holes (1a2, 1a3, 1a4) are formed at mutually different staggered positions; the downstream side of the shell part (1a) is an inclined pipe part (1e) connected with a conical shell part (1c), the diameter of the conical shell part (1c) is gradually reduced, the diameter of the conical shell part (1c) is gradually reduced, and an opening (1d) is arranged to face the central part of a combustor inner cylinder (103b), so that mixed gas is injected to flame formed by pilot fuel. 本发明提供一种在生成燃烧气体和空气的混合气体时，生成均匀且充分稀释的混合气体的燃气轮机的预混合管结构；在预混合管(1)的圆筒状的壳体部(1a)上形成气孔(1a1、1a2、1a3、1a4)，形成于最上游侧的气孔(1a1)的数量