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A method for improving the flue gas corrosion resistance of coal-fired boiler heating surface pipes

A technology for coal-fired boilers and corrosion performance, applied in combustion methods, combustion chambers, combustion equipment, etc., can solve the problems of damaging the life of pipelines and increasing the difficulty of maintenance work, so as to improve heat transfer efficiency and improve flue gas corrosion resistance Performance, the effect of high anti-oxidation grade corrosion resistance

Active Publication Date: 2016-05-18
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But no matter how the anti-wear tile is designed, a lot of welding technology is required during the installation of the tile, which not only increases the difficulty of maintenance work, but also directly spot welding on the pipeline will also damage the life of the pipeline

Method used

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  • A method for improving the flue gas corrosion resistance of coal-fired boiler heating surface pipes
  • A method for improving the flue gas corrosion resistance of coal-fired boiler heating surface pipes
  • A method for improving the flue gas corrosion resistance of coal-fired boiler heating surface pipes

Examples

Experimental program
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Effect test

Embodiment 1

[0017] refer to figure 1 , when the heating surface pipeline of the coal-fired boiler is a superheater, the specific operation of the method for improving the anti-flue gas corrosion resistance of the heating surface pipeline of the coal-fired boiler is to remove the coking and corrosion layers on the outer wall of the heating surface pipeline of the coal-fired boiler, and then A corrosion-resistant alloy thin strip is spirally wound on the outer wall of the heating surface pipe of the coal-fired boiler through an adhesive. The composition of the corrosion-resistant alloy thin strip is 80% Ni, 15% aluminum and 5% impurities. The thickness of the etched alloy strip was 500 microns.

[0018] The adhesive is aluminum silicate.

[0019] The coking and corrosion layers on the outer wall of the heating surface pipes of the coal-fired boiler are removed mechanically.

Embodiment 2

[0021] refer to figure 1 , when the heating surface pipe of the coal-fired boiler is a reheater, the specific operation of the method for improving the anti-flue gas corrosion resistance of the heating surface pipe of the coal-fired boiler is to remove the coking and corrosion layers on the outer wall of the heating surface pipe of the coal-fired boiler, Then, a corrosion-resistant alloy thin strip is wound on the outer wall of the heating surface pipe of the coal-fired boiler through an adhesive. The composition of the corrosion-resistant alloy thin strip is 40% Ni, 55% aluminum, and 5% impurities. The thickness of the ribbon is 500 microns.

[0022] The binder is phosphate.

[0023] The coking and corrosion layers on the outer wall of the heating surface pipes of the coal-fired boiler are removed mechanically.

Embodiment 3

[0025] refer to figure 2 , when the heating surface pipeline of the coal-fired boiler is a water-cooled wall, the specific operation of the method for improving the anti-flue gas corrosion performance of the heating surface pipeline of the coal-fired boiler is to remove the coking and corrosion layers on the outer wall of the heating surface pipeline of the coal-fired boiler, and then A corrosion-resistant alloy thin strip is axially attached to the outer wall of the heating surface pipe of the coal-fired boiler through an adhesive, and the composition of the corrosion-resistant alloy thin strip is 70% Ni, 28% aluminum and 2% impurities. The thickness of the corrosion resistant alloy strip was 250 microns.

[0026] The adhesive is aluminum silicate.

[0027] The coking and corrosion layers on the outer wall of the heating surface pipes of the coal-fired boiler are removed mechanically.

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Abstract

The invention discloses a method improving the smoke corrosion resistance of a pipeline on a heating surface of a coal-fired boiler. A corrosion-resistant alloy strip (not larger than 500 micrometers) winds around and adheres to the pipeline so that the purposes of not influencing the heat transfer efficiency of the heating surface and remarkably improving the high temperature corrosion resistance and erosive wear resistance of the smoke side of the pipeline can be achieved. The method can be used for heating surface components such as a boiler water-cooling wall, a superheater, a reheater and a coal economizer. Compared with the method such as thermal spraying and anti-abrasion tile and sleeve applying adopted currently, the method has the advantages that operation is simpler, the heat conduction efficiency is higher, the cost is lower and the service life is longer.

Description

technical field [0001] The invention relates to a method for resisting flue gas corrosion, in particular to a method for improving the anti-flue gas corrosion performance of a heating surface pipe of a coal-fired boiler. Background technique [0002] The boiler's water wall, superheater, reheater, economizer tube and its hanging parts are in direct contact with the boiler combustion flue gas, and the corrosion problem is extremely serious, which leads to leakage and blasting accidents, which threaten the safe operation of power plant boilers. It is one of the important factors and must therefore be given full attention. At the same time, the corrosion resistance of the flue gas side is also one of the indicators in the selection of boiler pipes. [0003] The flue gas side corrosion of the boiler heating surface is a relatively complex physical and chemical process. This type of corrosion is widespread and diverse in heating surface piping. Including: 1) high temperature c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23M5/08F28F19/00
Inventor 鲁金涛杨珍谷月峰赵新宝袁勇严靖博尹宏飞
Owner XIAN THERMAL POWER RES INST CO LTD