Multi-section TRT stationary blade inner shell

Abstract

The invention relates to a multi-section TRT stationary blade inner shell. The multi-section TRT stationary blade inner shell comprises a first-stage air inlet section, a first-stage expanding section, a second-stage air inlet section and a second-stage expanding section which are coaxially arranged and sequentially connected. A first arc section capable of being matched with the spherical surfaceof a first-stage stationary blade is arranged in the circumferential direction of the first-stage air inlet section. A second arc section capable of being matched with the spherical surface of z second-stage stationary blade is arranged in the circumferential direction of the second-stage air inlet section. The stationary blade inner shell adopts a multi-section structural design, so that each stage of stationary blade of the TRT has an expansion angle matched with the stationary blade. The first arc section of the first-stage air inlet section is matched with the spherical surface of the first-stage stationary blade, and the second arc section of the second-stage air inlet section is matched with the spherical surface of the second-stage stationary blade, so that on one hand, the problemthat a radial gap between a TRT stationary blade body and an inner shell is too large is solved, the overall efficiency is improved, and on the other hand, chamfering machining of stationary blade mounting holes is facilitated, and machining efficiency is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of vane rotation, and in particular relates to a multi-stage TRT stationary vane inner shell. Background technique [0002] The Top Gas Pressure Recovery Turbine (TRT for short) of blast furnace top gas pressure recovery is a device that utilizes the heat energy and pressure energy of blast furnace auxiliary gas to perform work through a turbine. The device is mainly composed of rotor, casing, stator blade inner casing, intake and exhaust guide basin, moving and static blades, components and adjustment mechanism. Among them, the inner casing of the stator blade is one of the important components that affect the power of the whole machine. [0003] The inner casing of the traditional vane usually adopts a single cone section design, such as figure 1 As shown, that is to say, the entire channel for gas expansion and work is only divided into two parts: the straight inlet section a and the single diameter-exp...

AI Technical Summary

Problems solved by technology

[0004] In order to solve some or all of the above-mentioned problems, the present invention provides a multi-section TRT vane inner casing, which solves the problem that the expansion angle of the expansion section of the traditional TRT stator vane inner casing is single, and the airfoils of each level can only match a single expansion angle. The radial gap on the side of the inner shell of the second-stage stator is too large, and the inner chamfer of the installation hole of the second-stage stator is inconvenient to process, which facilitates processing and greatly improves the efficiency of the entire unit

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