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Turbine jet nozzle static and moving blade preventing solid microparticle from etching and its heat treatment method

A heat treatment method and solid particle technology, applied in the direction of machines/engines, blade support components, mechanical equipment, etc., can solve the problems that supercritical units cannot meet the design requirements, etc., and achieve the effect of improving the anti-solid particle erosion performance and firm combination

Inactive Publication Date: 2004-12-15
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method can no longer meet the requirements of design and power plant users for supercritical units.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The static vane and moving vane of the nozzle are made of 12% Cr martensitic heat-resistant steel material (such as 2Cr12NiMo1W1V or 2Cr12Mo1VNbN, etc.), and boronizing and tempering are carried out on the surface of the blade: the boronizing agent is granular single-phase boronizing agent , the process parameter of boriding treatment is 900℃×3 hours, air cooling, and a layer of single-phase Fe is formed on the surface of the blade after boriding treatment 2 B structure, the depth of the boronizing layer is 0.01mm; tempering treatment, after the boronizing treatment is completed, then tempering treatment, the tempering treatment process parameters are 600 ° C × 2 hours, air cooling.

Embodiment 2

[0015] The process parameters of boronizing treatment are 950℃×4 hours, air cooling, and a layer of single-phase Fe is formed on the surface of the blade after boriding treatment 2 B structure, the depth of the boronizing layer is 0.03mm; tempering treatment, after the boronizing treatment is completed, then tempering treatment, the tempering treatment process parameters are 650 ° C × 5 hours, air cooling.

Embodiment 3

[0017] The process parameter of boriding treatment is 1000℃×10 hours, air cooling, and a layer of single-phase Fe is formed on the surface of the blade after boriding treatment 2 B structure, the depth of the boronizing layer is 0.04mm; tempering treatment, after the boronizing treatment is completed, then tempering treatment, the tempering treatment process parameters are 680 ° C × 8 hours, air cooling.

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Abstract

The static and moving blade used in supercritical and super-supercritical jet are made of 12%Cr heat resistant martensite steel and have the surface first boronizing treated with granular single phase boronizing agent to form one layer of single phase Fe2B structure combined firmly with the substrate and then tempering treated. The boronized layer has hardness as high as 1200-1600 HV, much higher than that of nitridated layer, and stable high temperature hardness. The present invention can meet the requirement of preventing solid particle erosion of supercritical and super-supercritical jet.

Description

technical field [0001] The invention relates to a steam turbine nozzle, especially its static and moving blades and a heat treatment method thereof. The blades are applied to the nozzle of a supercritical or ultra-supercritical steam turbine unit to prevent erosion of solid particles. Background technique [0002] Solid particle erosion is referred to as SPE (Solid Partcie Erosion). Solid particle erosion of steam turbine materials mainly occurs on thermal power steam turbines, especially supercritical steam turbines. The objects of its destruction are the nozzle blades and moving blades of the high-pressure regulating stage. The erosion of solid particles damages the profiles of the nozzle blades of the regulating stage and the moving blades, which reduces the thermal efficiency of the steam turbine, reduces the availability of the unit, and increases the maintenance cost of the unit. For steam turbine units, the solid particles that cause unit erosion are Fe 3 o 4 and ...

Claims

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Application Information

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IPC IPC(8): F01D1/02F01D5/28F01D9/02
Inventor 范华杨功显胡维成杨仕树张波
Owner DONGFANG TURBINE CO LTD
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