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Method for improving wear resistance of boiler pipe bend through foamed aluminum

A boiler tube and foamed aluminum technology is applied in the field of improving the wear resistance of boiler tube elbows, which can solve the problems of reduced pressure bearing capacity, thinning wear, and tube bursting, so as to improve reliability and economy, and improve wear resistance. , the effect of reducing the probability of pipe burst

Active Publication Date: 2020-08-18
HUANENG INT POWER CO LTD YUHUAN POWER PLANT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The boiler tube elbows of thermal power units are impacted by fly ash and flue gas for a long time, which is prone to wear and thinning, resulting in a decrease in pressure bearing capacity and tube explosion, which affects the safe operation of the unit

Method used

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Experimental program
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Effect test

Embodiment Construction

[0027] The present invention is further described below.

[0028] A method for improving the wear resistance of boiler pipe elbows through aluminum foam provided by the invention comprises the following steps:

[0029] Step 1. Put aluminum powder and foaming agent into a ball mill tank at a volume ratio of 2:1, and mix them evenly through a planetary ball mill. Specifically include the following points:

[0030] 1) The particle size of aluminum powder should be between 100 mesh and 200 mesh.

[0031] 2) Foaming agent is NH 4 Cl, the particle size is the same as that of aluminum powder.

[0032] 3) 1 / 3 volume of absolute ethanol should be added to the ball mill jar to avoid overheating.

[0033] 4) The rotational speed of the ball mill is 200 revolutions per minute, and the duration is 2 hours.

[0034] Step 2. Evenly coat the mixed powder of aluminum powder foaming agent on the inner surface of the mould, and put the boiler pipe elbow into the mould. Specifically include...

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Abstract

The invention discloses a method for improving wear resistance of a boiler pipe bend through foamed aluminum. The method comprises the steps that aluminum powder and a foaming agent are mixed evenly through a planetary ball mill according to the volume ratio being 2:1; the inner surface of a mold is evenly coated with evenly-mixed aluminum powder and foaming agent mixed powder, and the boiler pipebend is placed in the mold; the mold is placed in a vacuum diffusion welding furnace to be subjected to high-temperature treatment, and the pressure of 0.75 MPa is kept for the mold all the time in the processes of temperature increase, heat preservation and cooling; and the foamed aluminum covered layer of the outer surface of the boiler pipe bend subjected to high-temperature treatment is ground, and operation can be stopped when a black oxidization layer generated by high-temperature treatment is thoroughly ground off.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and in particular relates to a method for improving the wear resistance of boiler pipe elbows through aluminum foam. Background technique [0002] The boiler tube elbows of thermal power units have been impacted by fly ash and flue gas for a long time, and are prone to wear and thinning, resulting in a decrease in pressure bearing capacity and tube bursts, which affect the safe operation of the unit. Improving the wear resistance of the outer surface of the boiler tube elbow is of great significance for resisting the wear of fly ash and flue gas and preventing the tube from thinning and bursting. Aluminum foam is a new type of structural material with good wear resistance, which can be made by mixing aluminum powder and foaming agent and then sintering at high temperature. Contents of the invention [0003] The purpose of the present invention is to provide a method for improv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 崔雄华熊伟杨哲一马巧春傅望安常毅君
Owner HUANENG INT POWER CO LTD YUHUAN POWER PLANT
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