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Analysis method for thermal power generation unit boiler water cooling wall scaling types and reasons

A thermal power generation unit and analysis method technology, which is applied in the direction of material analysis using radiation diffraction, material analysis, and material analysis through optical means, which can solve the problems of increased energy consumption, water-cooled wall tube burst, and inability to accurately diagnose the cause of scaling, etc. question

Inactive Publication Date: 2016-11-09
CENT CHINA BRANCH OF CHINA DATANG CORP SCI & TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Scaling of water-cooled wall tubes will not only reduce boiler efficiency and increase energy consumption, but also cause corrosion under scale and local overheating of furnace tubes caused by scaling, which will also cause the risk of tube explosion in the water-cooled wall
[0003] At present, the analysis method of scaling on boiler water wall is mainly based on the analysis of scale amount and scale composition, which can only determine the type of scaling on the water wall for descaling, but cannot accurately diagnose the cause of scaling
After searching, the current diagnosis and analysis methods for the scaling types of the water cooling wall are mostly used as the basis for descaling of the water cooling wall, and there is no comprehensive method that can accurately diagnose the cause of the scaling of the thermal power unit boiler water cooling wall

Method used

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  • Analysis method for thermal power generation unit boiler water cooling wall scaling types and reasons
  • Analysis method for thermal power generation unit boiler water cooling wall scaling types and reasons
  • Analysis method for thermal power generation unit boiler water cooling wall scaling types and reasons

Examples

Experimental program
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Effect test

Embodiment 1

[0081] A method for analyzing scaling types and causes of boiler water walls of thermal power generating units, comprising the following steps:

[0082] (1) Cut the economizer pipe (at the entrance) and water wall pipe samples of 1m each, observe the scaling situation, and find that the corrosion products on the inner surface of the water wall are firmly bonded to the metal;

[0083] (2) Cut the cut economizer pipes and water wall pipe samples into 5cm long pipe sections, perform peeling treatment, and cut them in half according to the fire side and back fire side, then perform chemical cleaning, and observe the economizer after cleaning The appearance of the tube and water wall tube-like substrate showed that there were corrosion pits on the metal surface of the water wall substrate after chemical cleaning, and the economizer tube had no obvious corrosion phenomenon and the amount of scale was small;

[0084] The specific method of the chemical cleaning is as follows: Weigh t...

Embodiment 2

[0089] A method for analyzing scaling types and causes of boiler water walls of thermal power generating units, comprising the following steps:

[0090] (1) Cut the economizer pipe (at the entrance) and water wall pipe samples of 1m each, observe the scaling situation, and find that there are pit and groove corrosion on the inner surface of the water wall, and a lot of black scale is accumulated in the pit;

[0091] (2) Cut the cut economizer pipes and water wall pipe samples into 5cm long pipe sections, perform peeling treatment, and cut them in half according to the fire side and back fire side, then perform chemical cleaning, and observe the economizer after cleaning The shape of the tube-like matrix of the tube and boiler water wall, the inner surface of the water wall has pit and groove corrosion, and the economizer tube has no obvious corrosion phenomenon and the amount of scale is small;

[0092] The specific method of the chemical cleaning is as follows: Weigh the peel...

Embodiment 3

[0097] A method for analyzing scaling types and causes of boiler water walls of thermal power generating units, comprising the following steps:

[0098] (1) Cut the economizer pipe (at the entrance) and water wall pipe samples of 1m each, observe the scaling situation, and find that the corrosion products on the inner surface of the water wall are firmly bonded to the metal, and there are pit and groove corrosion on the inner surface;

[0099] (2) Cut the cut economizer tubes and scaled boiler water wall tube samples into 5cm long tube sections, peel them off, and cut them in half according to the fire side and the back fire side, then perform chemical cleaning, observe the after cleaning The appearance of the economizer tube and the boiler water wall tube-like matrix, the inner surface of the water wall has pit and groove corrosion, and the economizer tube has no obvious corrosion phenomenon and the amount of scale is small;

[0100] The specific method of the chemical cleani...

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Abstract

The invention discloses an analysis method for thermal power generation unit boiler water cooling wall scaling types and reasons. The thermal power generation unit boiler water cooling wall scaling types and reasons are comprehensively diagnosed by combining three means including macroscopic examination, metal metallographic examination and X-ray diffraction phase analysis. The analysis method mainly comprises the steps of macroscopic morphology observing, cutting, peeling, bisecting, cleaning, morphology observing after cleaning, metallographic analyzing on water cooling wall tube sample scales, X-ray diffraction phase analyzing on scale components and the like. According to the method, the thermal power generation unit boiler water cooling wall scaling types and reasons can be accurately and systematically diagnosed, and a basis is provided for prevention measure formulating and thermal equipment running mode optimizing; a diagnosis result obtained through the method is accurate and can be applied to chemical technology supervision work of a power plant.

Description

technical field [0001] The invention relates to an analysis method for scaling types and causes of boiler water walls of thermal power generating units, and belongs to the technical field of metal material protection. Background technique [0002] The boiler is one of the important thermal equipment in thermal power plants, and the fouling of water-cooled wall tubes is an important factor affecting the health of the boiler. Scaling of water-cooled wall tubes will not only reduce boiler efficiency and increase energy consumption, but also cause corrosion under scale and local overheating of furnace tubes caused by scaling, which will also cause the risk of tube explosion in the water-cooled wall. [0003] At present, the analysis methods for boiler water wall scaling are mainly based on the analysis of scale amount and scale composition, which can only determine the type of scaling on the water cooling wall for descaling, but cannot accurately diagnose the cause of scaling. ...

Claims

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Application Information

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IPC IPC(8): G01N21/84G01N21/88G01N23/20
CPCG01N21/84G01N21/88G01N23/20
Inventor 孙勇张春雷周晓湘徐华伟汪永威王强丁朋果赵琼婧王浩
Owner CENT CHINA BRANCH OF CHINA DATANG CORP SCI & TECH RES INST CO LTD
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