High-rotating-speed blast furnace gas energy recovery turbine

The invention relates to the technical field of turbines, in particular to a high-rotating-speed blast furnace gas energy recovery turbine to solve the problems that an existing blast furnace gas energy recovery turbine is high in production cost, the efficiency cannot be further improved under existing conditions, and the blade profile cannot be suitable for high rotating speed. The turbine comprises a first-stage stationary blade, a first-stage movable blade, a second-stage stationary blade and a second-stage movable blade, the ratio of the pitch t12 of a blade lattice of the first-stage movable blade to the chord length b12 of the first-stage movable blade is 0.68-0.75, and the ratio of the pitch t22 of a blade lattice of the second-stage movable blade to the chord length b22 of the second-stage movable blade is 0.68-0.75; the ratio of the maximum thickness Cmax11 of the first-stage stationary blade to the chord length b11 of the first-stage stationary blade is 0.2-0.25, the ratio of the maximum thickness