CN114705820A - Detection method and evaluation method for residual life of anticorrosive alloy coating on heating surface of waste incineration boiler - Google Patents
Detection method and evaluation method for residual life of anticorrosive alloy coating on heating surface of waste incineration boiler Download PDFInfo
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- CN114705820A CN114705820A CN202210324824.9A CN202210324824A CN114705820A CN 114705820 A CN114705820 A CN 114705820A CN 202210324824 A CN202210324824 A CN 202210324824A CN 114705820 A CN114705820 A CN 114705820A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/20—Metals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/20—Metals
- G01N33/202—Constituents thereof
Abstract
The invention provides a method for quickly detecting and evaluating the residual life of an anticorrosive alloy coating on a heating surface of a waste incineration boiler, which comprises the following steps: detecting the surface hardness and components of the alloy coating; the evaluation method is based on the distribution relation of the hardness and the components in the cross section of the alloy coating along with the coating thickness, and the residual service life of the coating is quickly evaluated by detecting the surface hardness and the component corresponding to the residual coating thickness during the furnace shutdown. The method can quickly judge the application effect of the anticorrosive alloy coating on the heating surface of the waste incineration boiler, and ensure the long-period stable operation of the boiler; aiming at the problems of large workload, large detection result deviation and the like caused by the adoption of an ultrasonic thickness gauge mode for the residual thickness of an anticorrosive coating during the blowing out period, a rapid detection and evaluation method for the residual service life based on the change of the surface hardness and the components of the coating along with the thickness is adopted, the effects of saving the blowing out time, reducing the workload and reducing the detection deviation are realized, and the long-period stable and safe operation of a boiler is ensured.
Description
Technical Field
The invention relates to the field of protection of heating surfaces of municipal source domestic waste incineration boilers, in particular to a detection method and an evaluation method for residual life of an anticorrosive alloy coating of the heating surfaces of the municipal source domestic waste incineration boilers.
Background
In order to relieve pipe explosion caused by high-temperature corrosion of the heating surface of the waste incineration waste heat boiler and realize safe and stable operation, the heating surface of the boiler needs to be subjected to anti-corrosion treatment. The main anticorrosion techniques at present are casting materials, alloy coatings and pipes. The most important way to improve the corrosion resistance of the heating surface is to add a protective alloy coating between the metal of the heating surface and the corrosive medium. Compared with castable corrosion prevention, the alloy coating hardly has the problem of reduction of heat exchange efficiency. However, the alloy coating itself is continuously corroded while it functions to protect the heated surface. Therefore, the alloy coating has strong substrate binding force, high hot corrosion resistance and thermal fatigue resistance, and has a similar thermal expansion coefficient with the substrate material.
In order to obtain an alloy coating with low price and excellent corrosion resistance, the types of alloy materials and cladding processes of the corrosion-resistant coating of the heating surface of the domestic and foreign waste incineration power plant are various at present. The alloy material mainly relates to a nickel-based material and a cobalt-based material, but the specific components are complicated to change, and common materials include INCONEL625 and INCONEL 686. For the cladding process, surfacing, laser cladding and micro fusion welding are mainly adopted.
With the high-parameter development of the waste incineration boiler, the application area of the anticorrosive coating is enlarged and even reaches thousands of levels, so that the measurement of the residual service life of the anticorrosive alloy coating on the heating surface of the waste incineration boiler is very necessary. The tradition adopts ultrasonic thickness gauge measurement mode, and this kind of measurement mode has following shortcoming: 1) the existence of a measurement area is not representative, and a corrosion-prone area cannot be found out;
2) each measuring point is subjected to work such as grinding, ash removal, surface polishing and the like, the workload is large, the furnace shutdown time is prolonged, and in the furnace shutdown period, domestic garbage cannot be treated, so that the environmental protection pressure is increased; 3) the phenomenon of inaccurate measured value exists in traditional residual wall thickness direct measurement mode because the measurement process needs probe and pipe wall closely to laminate, but the pipe wall is convex, and contains a large amount of dusts in the stove during the blowing out.
Due to the defects of the measuring method, a set of rapid detection and evaluation method is needed for the residual life of the anticorrosive alloy coating on the heating surface of the waste incineration boiler, so that the surface hardness and the components of the coating in an area easy to corrode can be rapidly detected, the residual life condition of the alloy coating can be evaluated, the application performance of the alloy coating in the boiler can be comprehensively known, and the long-period stable operation of the boiler can be guaranteed.
Disclosure of Invention
The invention aims to provide a method for detecting the residual life of an anticorrosive alloy coating on a heating surface of a waste incineration boiler, which can quickly detect the residual life.
In view of this, the application provides a method for detecting the residual life of an anticorrosive alloy coating on a heating surface of a waste incineration boiler, which comprises the following steps:
A) judging the material and the processing mode of the initial anticorrosive alloy coating;
B) cutting a sample to respectively obtain the cross section hardness of the anticorrosive alloy coating and a relation graph of components and thickness;
C) during the furnace shutdown period, performing gridding division on an application area of the anticorrosive alloy coating, setting a plurality of monitoring points, and detecting the surface hardness and components to obtain the surface hardness and components of the anticorrosive alloy coating after application;
D) determining the residual wall thickness of the anti-corrosion alloy coating after application according to the relation graph in the step B) and the surface hardness and the components of the anti-corrosion alloy coating after application.
The application also provides an evaluation method of the residual life of the anticorrosive alloy coating on the heating surface of the waste incineration boiler, which comprises the following steps:
A) judging the material and the processing mode of the initial anticorrosive alloy coating;
B) cutting a sample to respectively obtain the cross section hardness of the anticorrosive alloy coating and a relation graph of components and thickness;
C) during the furnace shutdown period, performing gridding division on an application area of the anticorrosive alloy coating, setting a plurality of monitoring points, and detecting the surface hardness and components to obtain the surface hardness and components of the anticorrosive alloy coating after application;
D) determining the residual wall thickness of the anti-corrosion alloy coating after application according to the relation chart in the step B) and the surface hardness and the components of the anti-corrosion alloy coating after application;
E) judging whether the residual wall thickness is smaller than the safe wall thickness, if so, performing the step F), and if not, performing the step G);
F) treating the surface of the coating corresponding to the residual wall thickness, and rechecking by using an ultrasonic thickness gauge;
G) judging the service life to be normal;
H) judging whether the rechecked residual wall thickness is smaller than the safe wall thickness again, if so, entering the step J), and if not, performing the step G);
J) and maintaining the anticorrosive alloy coating corresponding to the rechecked residual wall thickness.
Preferably, the gridding division specifically includes:
setting detection points every X lines in the application area of the anticorrosive alloy coating along the width and depth direction of the hearth and every Y meters in height; wherein X is 3-5 and Y is 2-4.
Preferably, in step C), the test is a non-destructive test.
Preferably, in the step B), the relationship graph is a distribution graph of cross-sectional composition and thickness of the anticorrosive alloy coating and a distribution graph of cross-sectional hardness and thickness of the anticorrosive alloy coating.
Preferably, the anticorrosive alloy coating is laser cladding 625 alloy.
Preferably, in step F), the treatment is ash removal and grinding.
The application provides a method for detecting the residual life of an anticorrosive alloy coating on a heating surface of a waste incineration boiler, which comprises the steps of firstly judging the material and the processing mode of an initial anticorrosive alloy coating, obtaining a cross section hardness-thickness and cross section component-thickness relation diagram, detecting surface hardness and components of a plurality of points of an application area after the anticorrosive alloy coating is applied, and corresponding the surface hardness and the components with the relation diagram to obtain the residual wall thickness. The detection method can quickly and effectively detect the residual wall thickness.
Further, the application can also determine whether to repair or continue using according to the comparison between the residual wall thickness and the safety wall thickness. In conclusion, the detection method and the evaluation method provided by the application can not only quickly detect the surface hardness and the components of the coating in the corrosion-prone area, but also evaluate the residual service life condition of the alloy coating, comprehensively know the application performance of the anti-corrosion alloy coating in the furnace and ensure the long-period stable operation of the boiler.
Drawings
FIG. 1 is a cross-sectional composition-thickness distribution graph of an anticorrosive alloy coating according to example 1 of the present invention;
FIG. 2 is a cross-sectional hardness-thickness distribution curve of the anticorrosive alloy coating according to example 1 of the present invention;
FIG. 3 is a schematic diagram of gridding of the monitoring area of the anticorrosive alloy coating according to embodiment 1 of the present invention;
FIG. 4 is a flow chart of the operation of the residual life of the anti-corrosion alloy coating on the heating surface of the waste incineration boiler.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
Aiming at the method for detecting the residual life of the anticorrosive alloy coating on the heating surface of the waste incineration boiler by using the traditional ultrasonic thickness gauge and the defects, a set of rapid detection and evaluation method is needed, so that the surface hardness and the components of the coating in an area easy to corrode can be rapidly detected, the residual life condition of the alloy coating can be evaluated, the application performance of the alloy coating in the boiler can be comprehensively known, and the long-period stable operation of the boiler can be guaranteed; therefore, the method for quickly detecting and evaluating the residual life of the anticorrosive alloy coating on the heating surface of the waste incineration boiler can quickly judge the residual life of the coating by detecting the surface hardness and the component of the coating corresponding to the thickness of the residual coating during the blowing out period based on the distribution relation of the hardness and the component in the cross section of the alloy coating along with the thickness of the coating. The flow of the detection method and the evaluation method provided by the application is specifically shown in fig. 4, and specifically, the embodiment of the invention discloses a method for detecting the residual life of an anticorrosive alloy coating on a heating surface of a waste incineration boiler, which comprises the following steps:
A) judging the material and the processing mode of the initial anticorrosive alloy coating;
B) cutting a sample to respectively obtain the cross section hardness of the anticorrosive alloy coating and a relation graph of components and thickness;
C) during the furnace shutdown period, performing gridding division on an application area of the anticorrosive alloy coating, setting a plurality of monitoring points, and detecting the surface hardness and components to obtain the surface hardness and components of the anticorrosive alloy coating after application;
D) determining the residual wall thickness of the anticorrosion alloy coating after application according to the surface hardness and the components after application according to the relational graph in the step B).
Further, the application also provides an evaluation method for the residual life of the anticorrosive alloy coating on the heating surface of the waste incineration boiler, which comprises the following steps:
A) judging the material and the processing mode of the initial anticorrosive alloy coating;
B) cutting a sample to respectively obtain the cross section hardness of the anticorrosive alloy coating and a relation graph of components and thickness;
C) during the furnace shutdown period, performing gridding division on an application area of the anticorrosive alloy coating, setting a plurality of monitoring points, and detecting the surface hardness and components to obtain the surface hardness and components of the anticorrosive alloy coating after application;
D) determining the residual wall thickness of the anti-corrosion alloy coating after application according to the relational graph in the step B);
E) judging whether the residual wall thickness is smaller than the safe wall thickness, if so, performing the step F), and if not, performing the step G);
F) treating the surface of the coating corresponding to the residual wall thickness, and rechecking by adopting an ultrasonic thickness gauge;
G) judging the service life to be normal;
H) judging whether the rechecked residual wall thickness is smaller than the safe wall thickness again, if so, entering the step J), and if not, performing the step G);
J) and maintaining the anticorrosive alloy coating corresponding to the rechecked residual wall thickness.
In the detection method and the evaluation method, the material and the processing mode of the initial anticorrosive alloy coating are judged firstly to lay a foundation for the subsequent relation curve; the method of such judgment is carried out according to methods well known to those skilled in the art. In the present application, the material and processing method of the corrosion-resistant alloy coating layer may be selected according to materials and methods well known to those skilled in the art, and there is no particular limitation in the present application. In a specific embodiment, the anticorrosive alloy coating is a coating made of 625 nickel alloy materials through a laser cladding processing technology.
Cutting a sample to obtain a cross section composition-thickness relation curve chart and a cross section hardness-thickness relation curve chart of the anticorrosive alloy coating; in the application, the cross section is a section of the anticorrosive alloy coating, the highest point of the coating is marked as 0, the thickness can be determined under the condition of corresponding hardness and components, and the thickness at the moment is the residual thickness of the coating.
After the preparation work, the waste incineration boiler starts to work, after the waste incineration boiler works for a period of time, the application area of the anticorrosive alloy coating is divided in a gridding mode during the furnace shutdown period, a plurality of monitoring points are set, the surface hardness and the components are detected, and the surface hardness and the components of the anticorrosive alloy coating after application are obtained. In the process, in order to realize comprehensive detection and reduce the detection workload and the furnace shutdown time, the grid division of the anticorrosive alloy coating is specifically as follows: setting detection points every X lines in the application area of the anticorrosive alloy coating along the width and depth direction of the hearth and every Y meters in height; wherein X is 3-5 and Y is 2-4. The above tests employ non-destructive testing, well known to those skilled in the art, to rapidly obtain post-application surface hardness and composition.
And determining the residual wall thickness after application according to the relation graph and the surface hardness and the components.
The residual thickness of the coating after the anticorrosive alloy coating on the heating surface of the waste incineration boiler is used for a plurality of times can be determined through the operation.
Further, in order to comprehensively evaluate the service life of the anticorrosive alloy coating, the application further performs subsequent evaluation, specifically:
E) judging whether the residual wall thickness is smaller than the safe wall thickness, if so, performing the step F), and if not, performing the step G);
F) treating the surface of the coating corresponding to the residual wall thickness, and rechecking by using an ultrasonic thickness gauge;
G) judging the service life to be normal;
H) judging whether the rechecked residual wall thickness is smaller than the safe wall thickness again, if so, entering the step J), and if not, performing the step G);
J) and maintaining the anticorrosive alloy coating corresponding to the rechecked residual wall thickness.
For different anti-corrosion alloy coatings, in order to ensure safe production of the boiler, technicians in the field can set the safe wall thickness of the anti-corrosion alloy coating, and the anti-corrosion alloy coating needs to be maintained when the wall thickness is smaller than the safe wall thickness. Therefore, the method judges whether the residual wall thickness is smaller than the safe wall thickness, if so, the surface of the coating is treated, an ultrasonic thickness gauge is adopted for rechecking, and if not, the service life of the anticorrosive alloy coating is judged to be normal, and the anticorrosive alloy coating can be used continuously; and judging whether the residual wall thickness obtained by rechecking is smaller than the safe wall thickness again, if so, maintaining, otherwise, indicating that the service life of the anticorrosive coating is normal, and continuing to use.
Aiming at the problems of various anticorrosive alloy coatings on the heating surface of the waste incineration boiler and large detection workload, the invention adopts a rapid detection and evaluation method of residual service life based on the change of the surface hardness and the components of the coating along with the thickness, thereby realizing the advantages of saving the shutdown time, reducing the workload and reducing the detection deviation and ensuring the long-period stable and safe operation of the boiler.
For further understanding of the present invention, the following examples are provided to describe the method for detecting and evaluating the residual life of the anticorrosive alloy coating on the heating surface of a waste incineration boiler, and the scope of the present invention is not limited by the following examples.
Example 1
The anticorrosive alloy coating adopts a laser cladding 625 processing technology, wherein 625 is an anticorrosive alloy powder material. The application condition of the heating surface of the garbage incinerator needs to be analyzed by laser cladding 625 anticorrosive alloy coating, the actual durability of the coating is evaluated, and whether maintenance is needed or not is evaluated. Cutting the sample to obtain the change of the cross section hardness and the component in the coating along with the thickness, as shown in fig. 1 and fig. 2, it can be seen that the content of Fe in the coating gradually increases along with the decrease of the residual thickness, and the hardness also shows a descending trend, when the content of Fe on the surface exceeds 10 percent and the hardness is obviously less than HV266.9, the residual thickness of the anticorrosion coating is obviously less than the safe thickness, and the anticorrosion coating needs to be maintained.
And (3) carrying out grid division on the first flue and the second flue of the garbage incinerator by adopting a laser cladding 625 anticorrosion alloy area, and setting quick detection points at intervals of 2 meters in height along the width and depth directions of a hearth at intervals of 3 tubes as shown in figure 3. During the furnace shutdown, the surface hardness and the components of the alloy coating provided with the detection points are rapidly measured on site, the content of Fe in the detection result is 3 percent, the hardness is HV280, the residual thickness is 800 mu m, the total thickness is 1000 mu m, the residual life is 80 percent, the corrosion-resistant alloy coating can be rapidly evaluated to be still at the normal life point, and the corrosion-resistant alloy coating can be continuously used. Because the workload of surface ash removal, polishing and the like is saved, the furnace shutdown time can be reduced by 60 percent, and the utilization rate of the equipment is greatly improved.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A method for detecting the residual life of an anticorrosive alloy coating on a heating surface of a waste incineration boiler comprises the following steps:
A) judging the material and the processing mode of the initial anticorrosive alloy coating;
B) cutting a sample to respectively obtain a cross section hardness and a relation graph of components and thickness of the anticorrosive alloy coating;
C) during the furnace shutdown period, performing gridding division on an application area of the anticorrosive alloy coating, setting a plurality of monitoring points, and detecting the surface hardness and components to obtain the surface hardness and components of the anticorrosive alloy coating after application;
D) and determining the residual wall thickness of the anti-corrosion alloy coating after application according to the relation chart in the step B) and the surface hardness and the components of the anti-corrosion alloy coating after application.
2. A method for evaluating the residual life of an anticorrosive alloy coating on a heating surface of a waste incineration boiler comprises the following steps:
A) judging the material and the processing mode of the initial anticorrosive alloy coating;
B) cutting a sample to respectively obtain the cross section hardness of the anticorrosive alloy coating and a relation graph of components and thickness;
C) during the furnace shutdown period, performing gridding division on an application area of the anticorrosive alloy coating, setting a plurality of monitoring points, and detecting the surface hardness and components to obtain the surface hardness and components of the anticorrosive alloy coating after application;
D) determining the residual wall thickness of the anti-corrosion alloy coating after application according to the relation chart in the step B) and the surface hardness and the components of the anti-corrosion alloy coating after application;
E) judging whether the residual wall thickness is smaller than the safe wall thickness, if so, performing the step F), and if not, performing the step G);
F) treating the surface of the coating corresponding to the residual wall thickness, and rechecking by using an ultrasonic thickness gauge;
G) judging the service life to be normal;
H) judging whether the rechecked residual wall thickness is smaller than the safe wall thickness again, if so, entering the step J), and if not, performing the step G);
J) and maintaining the anticorrosive alloy coating corresponding to the rechecked residual wall thickness.
3. The method according to claim 1 or 2, wherein the gridding partition is specifically:
setting detection points every X lines in the application area of the anticorrosive alloy coating along the width and depth direction of the hearth and every Y meters in height; wherein X is 3-5 and Y is 2-4.
4. The method according to claim 1 or 2, characterized in that in step C) the test is a non-destructive test.
5. The method according to claim 1 or 2, wherein in step B), the relationship graph is a cross-sectional composition and thickness profile of the corrosion-resistant alloy coating and a cross-sectional hardness and thickness profile of the corrosion-resistant alloy coating.
6. The method of claim 1 or 2, wherein the corrosion resistant alloy coating is laser clad 625 alloy.
7. The method according to claim 2, wherein in step F) the treatment is ash removal, sanding.
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| JPH0933517A (en) * | 1995-07-21 | 1997-02-07 | Kawasaki Steel Corp | Method for measuring quality of steel plate |
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| CN113487120A (en) * | 2020-09-25 | 2021-10-08 | 江苏科环新材料有限公司 | Method for establishing boiler flue corrosion prevention strategy and boiler flue corrosion prevention method |
| CN113868832A (en) * | 2021-08-20 | 2021-12-31 | 南京钢铁股份有限公司 | Method for predicting thickness of decarburized layer formed by continuous heating and heat preservation of high-carbon chromium bearing steel |
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- 2022-03-30 CN CN202210324824.9A patent/CN114705820A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0933517A (en) * | 1995-07-21 | 1997-02-07 | Kawasaki Steel Corp | Method for measuring quality of steel plate |
| CN105760936A (en) * | 2016-02-24 | 2016-07-13 | 西安西热电站信息技术有限公司 | Boiler 'four tubes' failure evaluation method based on field state inspection parameters |
| CN113487120A (en) * | 2020-09-25 | 2021-10-08 | 江苏科环新材料有限公司 | Method for establishing boiler flue corrosion prevention strategy and boiler flue corrosion prevention method |
| CN113868832A (en) * | 2021-08-20 | 2021-12-31 | 南京钢铁股份有限公司 | Method for predicting thickness of decarburized layer formed by continuous heating and heat preservation of high-carbon chromium bearing steel |
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