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Method for preventing local cavitation of flow passage component of water turbine

A technology for flow-passing components and water turbines, applied in anti-corrosion coatings, devices for coating liquid on the surface, coatings, etc., can solve the problems that thermal stress cannot be completely eliminated, increase the maintenance cost of power stations, and do not have treatment conditions, etc., to achieve perfection The effect of equipment management system, improvement of safe and stable operation level, excellent tensile and compressive capacity

Active Publication Date: 2021-02-02
YUNNAN HUADIAN LUDILA HYDROPOWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods all have certain disadvantages. The thermal stress caused by high temperature repair welding cannot be completely eliminated, which may easily cause material damage and cause deformation of components.
Brush plating is limited by the thickness of the coating, and it is prone to peeling off
However, treatment methods such as tungsten carbide are expensive, and the treatment conditions are often not available on site, so they need to be returned to the factory for treatment, which greatly increases the maintenance cost of the power station

Method used

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  • Method for preventing local cavitation of flow passage component of water turbine
  • Method for preventing local cavitation of flow passage component of water turbine
  • Method for preventing local cavitation of flow passage component of water turbine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) Select the smear material, select the repair agent for metal repair, select the curing agent for bonding, the curing agent is 200 low molecular weight polyamide, and the amine value is 230~260mg KOH / g;

[0057] (2) Surface treatment, use a polishing tool to polish the cavitation part of the flow-passing part, remove all impurities in the cavitation pit with acetone, and reveal the metallic luster, clean the polished surface with a detergent, and leave no dust and impurities on the surface, and dry the surface;

[0058] (3) Prepare the mixing agent, mix the repairing agent in step 1 with the curing agent, the weight ratio of the repairing agent and the curing agent is 1:0.14, use a stirring and rolling device to prepare the The mixture is continuously stirred and rolled in one direction, so that the streaks of different colors of the repairing agent and curing agent components in the mixture completely disappear until a smooth mixture with the same color appears, and...

Embodiment 2

[0070] (1) Select the smear material, select the repair agent for metal repair, select the curing agent for bonding, the curing agent is 200 low molecular weight polyamide, and the amine value is 230~260mg KOH / g;

[0071] (2) Surface treatment, use a polishing tool to polish the cavitation part of the flow-passing part, remove all impurities in the cavitation pit with acetone, and reveal the metallic luster, clean the polished surface with a detergent, and leave no dust and impurities on the surface, and dry the surface;

[0072] (3) Prepare the mixing agent, mix the repairing agent in step 1 with the curing agent, the weight ratio of the repairing agent and the curing agent is 10:1.2, use a stirring and rolling device to prepare the The mixture is continuously stirred and rolled in one direction, so that the streaks of different colors of the repairing agent and curing agent components in the mixture completely disappear until a smooth mixture with the same color appears, and...

Embodiment 3

[0084] (1) Select the smear material, select the repair agent for metal repair, select the curing agent for bonding, the curing agent is 200 low molecular weight polyamide, and the amine value is 230~260mg KOH / g;

[0085] (2) Surface treatment, use a polishing tool to polish the cavitation part of the flow-passing part, remove all impurities in the cavitation pit with acetone, and reveal the metallic luster, clean the polished surface with a detergent, and leave no dust and impurities on the surface, and dry the surface;

[0086] (3) Prepare the mixing agent, mix the repairing agent in step 1 with the curing agent, the weight ratio of the repairing agent and the curing agent is 7:1, use a stirring and rolling device to prepare the The mixture is continuously stirred and rolled in one direction, so that the streaks of different colors of the repairing agent and curing agent components in the mixture completely disappear until a smooth mixture with the same color appears, and mi...

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Abstract

The invention discloses a method for preventing local cavitation of a flow passage component of a water turbine. The method comprises the steps of (1) selecting a coating material, (2) carrying out surface treatment, (3) preparing a mixing agent, (4) coating, (5) curing and (6) polishing. The method carried out repair protection aiming at the problems of cavitation, corrosion, scouring and the like of a guide vane of the water turbine, is a beneficial attempt of new technology, and can quickly and efficiently solve a series of problems of cavitation, corrosion, scouring and the like of flow passage components of the water turbine; and the method is simple to operate and low in cost, can be widely used in the hydropower industry, perfects an enterprise equipment management system, and brings good economic benefits to enterprises.

Description

technical field [0001] The invention relates to the technical field of water turbine surface repair, in particular to a method for preventing local cavitation of flow-through parts of a water turbine. Background technique [0002] As the main equipment for converting water energy into electric energy in a hydropower plant, the performance of the water turbine directly affects the normal operation of the entire power station. The flow-passing parts of the turbine are composed of guide vanes, top cover, bottom ring, runners and blades. Since the transported medium usually includes solid particles such as sediment in addition to the liquid medium, the surface of the flow-passing parts is often subject to damage such as cavitation, erosion, etc. Damage such as wear and tear. With the increase of unit capacity and the deterioration of the operating conditions of the unit, low-frequency, large-amplitude pressure fluctuations will occur in the flow parts of the turbine, which incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/00B05D5/08B05D7/14B05D7/24C09D201/00C09D5/08C09D7/61C09D7/65C09D7/63
CPCB05D5/00B05D5/08B05D7/14B05D7/24C09D201/00C09D5/08C09D7/61C09D7/65C09D7/63B05D2202/10C08K2003/2244C08L71/02C08K3/00C08K3/22C08K13/02Y02E10/20
Inventor 王立凯文劲狄朋卫崔茁杨银兵郭楠范宇白小龙宋华文长生常国干
Owner YUNNAN HUADIAN LUDILA HYDROPOWER CO LTD
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