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Turbine blade water erosion damage remanufacturing method

A steam turbine blade and remanufacturing technology, which is applied to the supporting elements of blades, mechanical equipment, engine elements, etc., can solve the problems of low coating life and difficult construction in narrow spaces, and achieve the effect of avoiding the phenomenon of powder blocking the nozzle.

Active Publication Date: 2019-04-19
XIAN THERMAL POWER RES INST CO LTD
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings and deficiencies of the above-mentioned prior art, provide a steam turbine blade water erosion damage remanufacturing method through the large-caliber spray gun and multi-mode powder technology, and solve the problems of difficult construction in narrow spaces and low coating life in the prior art question

Method used

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  • Turbine blade water erosion damage remanufacturing method

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Embodiment

[0015] Example: Aiming at the phenomenon of water erosion of the Stellite alloy of a steam turbine blade of a 600MW unit, firstly, the jagged damage is polished to form a smooth surface, and the periphery of the area to be remanufactured is protected by a 0.5mm thin iron sheet, using 24-mesh brown The corundum is sandblasted, and after the sandblasting is completed, the sandblasting part is cleaned with high-pressure dry air. Stellite 6 powder with a particle size of 10-30 microns is used as the repair material, and Stellite 6 spherical powder material with a particle size of 100-200 microns is used as the shot blasting material, which is mechanically mixed by a powder mixer at a mass ratio of 1:1.5 and Put it into a powder mixer with a stirring device, and use air-assisted combustion supersonic flame spraying equipment for spraying, and the diameter of the throat of the spray gun is 10mm. The first propane pressure is 90psi, the second propane pressure is 98psi, the air press...

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Abstract

Turbine stellite water erosion is the inevitable phenomenon for a steam generator set. The invention provides a turbine blade water erosion damage remanufacturing method. Naturally, the multi-mode structure powder self-strengthening effect is used for improving the density and bonding strength of the stellite repaired through supersonic speed flame spraying, pressure stress is introduced into a coating, and the service life of the coating is prolonged. The method solves the problem that through the traditional technology, the service life of a re-manufactured layer is short after stellite water erosion, and the turbine blade water erosion damage remanufacturing method can be implemented on the site under the situation that a blade is not detached.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, and in particular relates to a water erosion damage remanufacturing method for a steam turbine blade Stellite alloy. Background technique [0002] Steam turbine blades are affected by wet steam during service, and are prone to water erosion damage on the intake side, forming serrated defects. Since the steam turbine is in a state of high-speed rotation during operation, the speed of the blade tip is very high and the centrifugal force is large. When there is a zigzag defect formed by water erosion on the surface of the component, under the action of the centrifugal force, blade fracture accidents are prone to occur, endangering the safe operation of the power plant. Stellite alloy sheets have excellent water corrosion resistance, but in the process of on-site construction, flame brazing of Stellite alloys has problems such as weak bonding, low one-time success rate, and significant he...

Claims

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Application Information

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IPC IPC(8): F01D5/00B23P6/00C23C4/129
CPCB23P6/002C23C4/129F01D5/005
Inventor 李勇刘福广李太江刘立营
Owner XIAN THERMAL POWER RES INST CO LTD
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