Power station boiler water wall expansion state evaluation method, system, equipment and medium

Abstract

The invention discloses a power station boiler water-cooled wall expansion state evaluation method, system, equipment and medium, and the method comprises the steps: arranging a plurality of groups of measuring points on a water-cooled wall, and enabling the measuring points to have different high standards on the water-cooled wall; the real-time thermal expansion amount of the water cooling wall is measured through each measuring point; for each group of measuring points, calculating the deformation discordance degree of the water-cooled wall under the same elevation according to the real-time thermal expansion amount of the water-cooled wall measured by each measuring point; the expansion state of the water cooling wall of the power station boiler is evaluated according to the deformation discordance degree of the water cooling wall under the same elevation. The method, the system, the equipment and the medium can meet real-time characterization of the expansion trend of the water cooling wall of the boiler and real-time evaluation of expansion data of the water cooling wall.

Description

Technical Field

[0001] The invention belongs to the technical field of boiler monitoring, and relates to a method, system, equipment and medium for evaluating the expansion state of a water-cooled wall of a power station boiler. Background Art

[0002] In the future, the peak regulation trend of thermal power units will develop towards higher frequency, larger amplitude and higher rate, which will pose a huge challenge to the safe operation of large thermal power units, especially large-capacity, high-parameter supercritical and ultra-supercritical power generating units.

[0003] Under the action of thermal shock load and thermal mismatch load caused by uneven heat transfer, the expansion of boiler water wall deviates from the original design state, and the local deformation is too inconsistent, resulting in water wall failure. The water wall of supercritical boiler has a larger heating area, and its deformation inconsistency under the action of temperature difference will be much higher than that of other grade units, which poses a greater safety risk. Therefore, it is necessary to monitor and evaluate the expansion state of power station boiler water wall in real time.

[0004] In actual engineering applications, power plant operators intermittently read the mechanical expansion indicator value and compare it with the boiler expansion design value under full-load design conditions to determine the expansion state of the boiler water wall. This method has two major disadvantages: (1) The frequency of manual intermittent reading is low, which cannot meet the load change rate of deep peak regulation, so a large number of problems will be missed; (2) The current deep peak regulation operating conditions have deviated far from the full-load design conditions, so the method of using the original design parameters to compare and evaluate the existing expansion volume has deviated from reality. Therefore, it is necessary to study a method for evaluating the expansion state of power plant boiler water walls based on real-time monitoring data, which must have the following characteristics: the distribution of measurement points can meet the real-time characterization of the boiler water wall expansion trend and the real-time evaluation of water wall expansion data. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to provide a method, system, equipment and medium for evaluating the expansion state of the water-cooled wall of a power plant boiler. The method, system, equipment and medium can meet the real-time characterization of the expansion trend of the boiler water-cooled wall and the real-time evaluation of the water-cooled wall expansion data.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] In one aspect, the present invention provides a method for evaluating the expansion state of a water-cooled wall of a power station boiler, comprising:

[0008] Arrange several groups of measuring points on the water-cooled wall, wherein each group of measuring points is at a different height on the water-cooled wall;

[0009] Measure the real-time thermal expansion of the water-cooled wall through each measuring point;

[0010] For each group of measuring points, calculate the degree of deformation incompatibility of the water-cooled wall at the same elevation based on the real-time thermal expansion of the water-cooled wall measured at each measuring point;

[0011] The expansion state of the water-cooled wall of the power station boiler is evaluated according to the degree of deformation inconsistency of the water-cooled wall at the same elevation.

[0012] The method for evaluating the expansion state of a power plant boiler water wall according to the present invention is further improved in that:

[0013] Furthermore, four groups of measuring points are arranged on the water-cooled wall, wherein measuring points 1, 2, 3 and 4 are arranged at the left front corner, left rear corner, right rear corner and right front corner of the area under the water-cooled wall through the ceiling respectively; measuring points 5, 6, 7 and 8 are arranged at the left front corner, left rear corner, right rear corner and right front corner of the water-cooled wall burner layer area respectively; measuring points 9, 10, 11 and 12 are arranged at the left front corner, left rear corner, right rear corner and right front corner of the junction of the cold ash hopper slope and the vertical water-cooled wall respectively, wherein measuring points 1, 2, 3 and 4 are located at the same elevation; measuring points 5, 6, 7 and 8 are located at the same elevation; measuring points 9, 10, 11 and 12 are located at the same elevation.

[0014] Furthermore, the state value before the boiler is started is detected by each measuring point, and this is used as the cold reference position. The hot real-time state of the boiler after startup is detected by each measuring point, and this is used as the hot parameter position. The change between the hot reference position and the cold reference position measured by each measuring point is calculated, and this is used as the real-time thermal expansion of the water-cooled wall measured at the measuring point.

[0015] Furthermore, the degree of incoordination of the deformation of the water-cooled wall at the same elevation at time t in D i-t is the thermal expansion of the water-cooled wall at measuring point i at time t.

[0016] Furthermore, it also includes:

[0017] Draw the degree of incoordination of the deformation of the water-cooled wall at the same elevation IC-t Curve of changes over time.

[0018] Furthermore, it also includes: for the monitored boiler type, the upper limit value D of the tolerance of the incoordination degree of water-cooled wall deformation is determined by combining the allowable stress of the water-cooled wall material through structural finite element analysis IC-max .

[0019] Furthermore, the process of evaluating the expansion state of the water-cooled wall of the power station boiler according to the degree of deformation incompatibility of the water-cooled wall at the same elevation is:

[0020] When D IC-t≥η·D IC-max , it means that the deformation of the water-cooled wall is too uncoordinated and the water-cooled wall is in a dangerous state; when D IC-t <η·D IC-max , it means that the degree of incoordination of water-cooled wall deformation is within the controllable range, where η is the safety factor, η=0.8.

[0021] In a second aspect of the present invention, the present invention provides a system for evaluating the expansion state of a water wall of a power station boiler, comprising:

[0022] An arrangement module is used to arrange a plurality of groups of measuring points on the water-cooled wall, wherein each group of measuring points has a different height at the water-cooled wall;

[0023] A measurement module, used to measure the real-time thermal expansion of the water-cooled wall through various measuring points;

[0024] A calculation module is used to calculate the degree of deformation incompatibility of the water-cooled wall at the same elevation according to the real-time thermal expansion of the water-cooled wall measured at each measuring point for each group of measuring points;

[0025] The evaluation module is used to evaluate the expansion state of the water-cooled wall of the power station boiler according to the degree of deformation incompatibility of the water-cooled wall at the same elevation.

[0026] In a third aspect of the present invention, a computer device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method for evaluating the expansion state of the water-cooled wall of a power plant boiler when executing the computer program.

[0027] In a fourth aspect of the present invention, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for evaluating the expansion state of the water-cooled wall of a power plant boiler are implemented.

[0028] The present invention has the following beneficial effects:

[0029] During specific operation, the method, system, equipment and medium for evaluating the expansion state of a power plant boiler water-cooled wall described in the present invention arrange several groups of measuring points on the water-cooled wall, wherein each group of measuring points is located at a different elevation of the water-cooled wall to meet the real-time characterization of the expansion trend of the boiler water-cooled wall. For each group of measuring points, the degree of deformation incompatibility of the water-cooled wall at the same elevation is calculated based on the real-time thermal expansion of the water-cooled wall measured at each measuring point. The expansion state of the water-cooled wall of the power plant boiler is evaluated based on the degree of deformation incompatibility of the water-cooled wall at the same elevation, thereby realizing real-time evaluation of the water-cooled wall expansion data.

[0030] Furthermore, four groups of measuring points are arranged on the water-cooled wall, wherein measuring points 1, 2, 3 and 4 are arranged at the left front corner, left rear corner, right rear corner and right front corner of the area under the ceiling of the water-cooled wall respectively; measuring points 5, 6, 7 and 8 are arranged at the left front corner, left rear corner, right rear corner and right front corner of the water-cooled wall burner layer area respectively; measuring points 9, 10, 11 and 12 are arranged at the left front corner, left rear corner, right rear corner and right front corner of the junction of the cold ash hopper slope and the vertical water-cooled wall respectively, wherein measuring points 1, 2, 3 and 4 are located at the same elevation; measuring points 5, 6, 7 and 8 are located at the same elevation; measuring points 9, 10, 11 and 12 are located at the same elevation, so as to meet the data measurement requirements of the water-cooled wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0032] Figure 1 It is a distribution diagram of each measuring point in the present invention;

[0033] Figure 2 The present invention is a flow chart of the method. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0036] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0037] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0038] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0039] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0041] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0042] Embodiment 1

[0043] refer to Figure 1 and Figure 2 The method for evaluating the expansion state of a power plant boiler water wall of the present invention comprises the following steps:

[0044] 1) When the power plant boiler is in shutdown state, expansion online monitoring devices are installed at the four intersection corners of the water-cooled wall wall surface at the intersection of the water-cooled wall through the ceiling, the water-cooled wall burner area, and the cold ash hopper slope and the vertical water-cooled wall. A total of 12 groups of expansion online monitoring devices are arranged to form 12 groups of measuring points, among which the left front corner, left rear corner, right rear corner, and right front corner of the water-cooled wall through the ceiling are measuring points 1, 2, 3, and 4 respectively; the left corner of the water-cooled wall burner layer area is The front corner, left rear corner, right rear corner and right front corner are measuring points 5, 6, 7 and 8 respectively; the left front corner, left rear corner, right rear corner and right front corner at the junction of the cold ash hopper slope and the vertical water-cooled wall are measuring points 9, 10, 11 and 12 respectively, among which, measuring points 1, 2, 3 and 4 are at the same elevation; measuring points 5, 6, 7 and 8 are at the same elevation; measuring points 9, 10, 11 and 12 are at the same elevation;

[0045] 2) 12 groups of expansion monitoring devices are connected to the distributed acquisition terminal respectively to achieve synchronous acquisition, and finally the expansion monitoring signal is transmitted to the data processing terminal through the signal cable;

[0046] 3) Detect the state value before the boiler is started by 12 sets of expansion monitoring devices, and use it as the cold reference position. Detect the hot real-time state of the boiler after the boiler is started by 12 sets of expansion monitoring devices, and use it as the hot parameter position. Calculate the change between the hot reference position and the cold reference position, and use it as the real-time thermal expansion of the water wall;

[0047] 4) Set parameter D IC-t It is used to evaluate the degree of incoordination of water-cooled wall deformation at the same elevation at a certain moment, where: in Draw the degree of incoordination of deformation of the water-cooled wall at a certain moment IC-t The curve of change over time, D i-t is the thermal expansion of the water-cooled wall at measuring point i at time t;

[0048] 5) According to the monitored boiler type, the upper limit value D of the tolerance of the water-cooled wall deformation incompatibility is determined through structural finite element analysis combined with the allowable stress of the water-cooled wall material. IC-max , at any moment, when D IC-t ≥η·D IC-max , it means that the deformation of the water-cooled wall is too uncoordinated and the water-cooled wall is in a dangerous state; when D IC-t <η·D IC-max, it means that the degree of incoordination of water-cooled wall deformation is within the controllable range, where η is the safety factor. Considering the existence of abnormal shape changes in the local water-cooled wall structure, it is recommended that η be 0.8.

[0049] Embodiment 2

[0050] The power station boiler water wall expansion state assessment system of the present invention comprises:

[0051] An arrangement module is used to arrange a plurality of groups of measuring points on the water-cooled wall, wherein each group of measuring points has a different height at the water-cooled wall;

[0052] A measurement module, used to measure the real-time thermal expansion of the water-cooled wall through various measuring points;

[0053] A calculation module is used to calculate the degree of deformation incompatibility of the water-cooled wall at the same elevation according to the real-time thermal expansion of the water-cooled wall measured at each measuring point for each group of measuring points;

[0054] The evaluation module is used to evaluate the expansion state of the water-cooled wall of the power station boiler according to the degree of deformation incompatibility of the water-cooled wall at the same elevation.

[0055] As an embodiment of the present invention, four groups of measuring points are arranged on the water-cooled wall, wherein measuring points 1, 2, 3 and 4 are arranged at the left front corner, left rear corner, right rear corner and right front corner of the area under the water-cooled wall through the ceiling; measuring points 5, 6, 7 and 8 are arranged at the left front corner, left rear corner, right rear corner and right front corner of the water-cooled wall burner layer area; measuring points 9, 10, 11 and 12 are arranged at the left front corner, left rear corner, right rear corner and right front corner of the junction of the cold ash hopper slope and the vertical water-cooled wall, wherein measuring points 1, 2, 3 and 4 are located at the same elevation; measuring points 5, 6, 7 and 8 are located at the same elevation; measuring points 9, 10, 11 and 12 are located at the same elevation.

[0056] As an implementation mode of the present invention, the state value before the boiler is started is detected by each measuring point, and this is used as the cold reference position. The hot real-time state of the boiler after startup is detected by each measuring point, and this is used as the hot parameter position. The change between the hot reference position and the cold reference position measured by each measuring point is calculated, and this is used as the real-time thermal expansion of the water-cooled wall measured by the measuring point.

[0057] As an embodiment of the present invention, the degree of incoordination of the deformation of the water-cooled wall at the same elevation at time t in D i-t is the thermal expansion of the water-cooled wall at measuring point i at time t.

[0058] As an embodiment of the present invention, it also includes:

[0059] Draw the degree of incoordination of the deformation of the water-cooled wall at the same elevation IC-t Curve of changes over time.

[0060] As an embodiment of the present invention, it also includes: for the monitored boiler type, by combining structural finite element analysis with the allowable stress of the water-cooled wall material, determining the upper limit value D of the tolerance of the incoordination degree of the water-cooled wall deformation IC-max .

[0061] As an implementation mode of the present invention, the process of evaluating the expansion state of the water-cooled wall of a power station boiler according to the degree of deformation incompatibility of the water-cooled wall at the same elevation is as follows:

[0062] When D IC-t ≥η·D IC-max , it means that the deformation of the water-cooled wall is too uncoordinated and the water-cooled wall is in a dangerous state; when D IC-t <η·D IC-max , it means that the degree of incoordination of water-cooled wall deformation is within the controllable range, where η is the safety factor.

[0063] The division of modules in the embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present application may be integrated into a processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0064] Embodiment 3

[0065] A computer device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of implementing the method for evaluating the expansion state of a water-cooled wall of a power plant boiler are, for example, comprising: arranging a plurality of groups of measuring points on the water-cooled wall, wherein each group of measuring points is at a different elevation of the water-cooled wall; measuring the real-time thermal expansion of the water-cooled wall through each measuring point; calculating the degree of deformation incompatibility of the water-cooled wall at the same elevation for each group of measuring points according to the real-time thermal expansion of the water-cooled wall measured by each measuring point; evaluating the expansion state of the water-cooled wall of the power plant boiler according to the degree of deformation incompatibility of the water-cooled wall at the same elevation, and arranging a plurality of groups of measuring points on the water-cooled wall; calculating the degree of deformation incompatibility of the water-cooled wall at the same elevation for each group of measuring points; evaluating the expansion state of the water-cooled wall of the power plant boiler according to the degree of deformation incompatibility of the water-cooled wall at the same elevation, and arranging a plurality of groups of measuring points on the water-cooled wall; calculating the degree of deformation incompatibility of the water-cooled wall at the same elevation ... and Four groups of measuring points are set, among which measuring points 1, 2, 3 and 4 are arranged at the left front corner, left rear corner, right rear corner and right front corner of the area where the water-cooled wall passes through the ceiling respectively; measuring points 5, 6, 7 and 8 are arranged at the left front corner, left rear corner, right rear corner and right front corner of the water-cooled wall burner layer area respectively; measuring points 9, 10, 11 and 12 are arranged at the left front corner, left rear corner, right rear corner and right front corner of the junction of the cold ash hopper slope and the vertical water-cooled wall respectively, among which measuring points 1, 2, 3 and 4 are located at the same elevation; measuring points 5, 6, 7 and 8 are located at the same elevation; measuring points 9, 10, 11 and 12 are located at the same elevation. The state value before the boiler is started is detected by each measuring point, and this is used as the cold reference position. The hot real-time state of the boiler after the boiler is started is detected by each measuring point, and this is used as the hot parameter position. The change between the hot reference position and the cold reference position measured by each measuring point is calculated, and this is used as the real-time thermal expansion of the water-cooled wall measured by the measuring point. Wherein, the memory may include a memory, such as a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk memory, etc. The processor, the network interface, and the memory are interconnected through an internal bus, and the internal bus can be an industrial standard architecture bus, a peripheral component interconnection standard bus, an extended industrial standard architecture bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs. Specifically, the program can include a program code, and the program code includes computer operation instructions. The memory can include a memory and a non-volatile memory, and provides instructions and data to the processor.

[0066] Embodiment 4

[0067] A computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the steps of the method for evaluating the expansion state of a water-cooled wall of a power plant boiler are implemented, for example, including: arranging a plurality of groups of measuring points on the water-cooled wall, wherein each group of measuring points is at a different elevation of the water-cooled wall; measuring the real-time thermal expansion of the water-cooled wall through each measuring point; calculating the degree of deformation incompatibility of the water-cooled wall at the same elevation for each group of measuring points according to the real-time thermal expansion of the water-cooled wall measured by each measuring point; evaluating the expansion state of the water-cooled wall of the power plant boiler according to the degree of deformation incompatibility of the water-cooled wall at the same elevation, arranging four groups of measuring points on the water-cooled wall, wherein Measuring points 1, 2, 3 and 4 are arranged at the left front corner, left rear corner, right rear corner and right front corner of the area below the water-cooled wall passing through the ceiling respectively; measuring points 5, 6, 7 and 8 are arranged at the left front corner, left rear corner, right rear corner and right front corner of the water-cooled wall burner layer area respectively; measuring points 9, 10, 11 and 12 are arranged at the left front corner, left rear corner, right rear corner and right front corner of the junction of the cold ash hopper slope and the vertical water-cooled wall respectively, among which measuring points 1, 2, 3 and 4 are located at the same elevation; measuring points 5, 6, 7 and 8 are located at the same elevation; measuring points 9, 10, 11 and 12 are located at the same elevation. The state value before the boiler is started is detected by each measuring point, and this is used as the cold reference position. The hot real-time state of the boiler after the boiler is started is detected by each measuring point, and this is used as the hot parameter position. The change between the hot reference position and the cold reference position measured by each measuring point is calculated, and this is used as the real-time thermal expansion of the water-cooled wall measured by the measuring point. Specifically, the computer-readable storage medium includes, but is not limited to, for example, volatile memory and / or non-volatile memory. The volatile memory may include random access memory (RAM) and / or cache memory (cache), etc. The non-volatile memory may include read-only memory (ROM), hard disk, flash memory, optical disk, magnetic disk, etc.

[0068] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0069] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0070] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0071] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for evaluating the expansion state of a power plant boiler water wall, characterized in that: include: Arrange several groups of measuring points on the water-cooled wall, wherein each group of measuring points is at a different height on the water-cooled wall; Measure the real-time thermal expansion of the water-cooled wall through each measuring point; For each group of measuring points, calculate the degree of deformation incompatibility of the water-cooled wall at the same elevation based on the real-time thermal expansion of the water-cooled wall measured at each measuring point; The expansion state of the water-cooled wall of the power station boiler is evaluated according to the degree of deformation inconsistency of the water-cooled wall at the same elevation.

2. The method for evaluating the expansion state of a power plant boiler water wall according to claim 1, characterized in that: Four groups of measuring points are arranged on the water-cooled wall, among which measuring points 1, 2, 3 and 4 are arranged at the left front corner, left rear corner, right rear corner and right front corner of the area where the water-cooled wall passes through the ceiling respectively; measuring points 5, 6, 7 and 8 are arranged at the left front corner, left rear corner, right rear corner and right front corner of the water-cooled wall burner layer area respectively; measuring points 9, 10, 11 and 12 are arranged at the left front corner, left rear corner, right rear corner and right front corner of the junction of the cold ash hopper slope and the vertical water-cooled wall respectively, among which measuring points 1, 2, 3 and 4 are located at the same elevation; measuring points 5, 6, 7 and 8 are located at the same elevation; measuring points 9, 10, 11 and 12 are located at the same elevation.

3. The method for evaluating the expansion state of a power plant boiler water wall according to claim 1, characterized in that: The state value before the boiler is started is detected by each measuring point, and this is used as the cold reference position. The hot real-time state of the boiler after startup is detected by each measuring point, and this is used as the hot parameter position. The change between the hot reference position and the cold reference position measured by each measuring point is calculated, and this is used as the real-time thermal expansion of the water-cooled wall measured at the measuring point.

4. The method for evaluating the expansion state of a power plant boiler water wall according to claim 1, characterized in that: The degree of incoordination of water-cooled wall deformation at the same elevation at time t in D i-t is the thermal expansion of the water-cooled wall at measuring point i at time t.

5. The method for evaluating the expansion state of a power plant boiler water wall according to claim 4, characterized in that: Also includes: Draw the degree of incoordination of the deformation of the water-cooled wall at the same elevation IC-t Curve of changes over time.

6. The method for evaluating the expansion state of a power plant boiler water wall according to claim 5, characterized in that: Also includes: According to the monitored boiler type, the upper limit value D of the tolerance of the water-cooled wall deformation incompatibility is determined through structural finite element analysis combined with the allowable stress of the water-cooled wall material. IC-max .

7. The method for evaluating the expansion state of a power plant boiler water wall according to claim 6, characterized in that: The process of evaluating the expansion state of the water-cooled wall of a power station boiler according to the degree of deformation incompatibility of the water-cooled wall at the same elevation is as follows: When D IC-t ≥η·D IC-max , it means that the deformation of the water-cooled wall is too uncoordinated and the water-cooled wall is in a dangerous state; when D IC-t <η·D IC-max , it means that the degree of incoordination of water-cooled wall deformation is within the controllable range, where η is the safety factor.

8. A power station boiler water wall expansion state assessment system, characterized in that: include: An arrangement module is used to arrange a plurality of groups of measuring points on the water-cooled wall, wherein each group of measuring points has a different height at the water-cooled wall; A measurement module, used to measure the real-time thermal expansion of the water-cooled wall through various measuring points; A calculation module is used to calculate the degree of deformation incompatibility of the water-cooled wall at the same elevation according to the real-time thermal expansion of the water-cooled wall measured at each measuring point for each group of measuring points; The evaluation module is used to evaluate the expansion state of the water-cooled wall of the power station boiler according to the degree of deformation incompatibility of the water-cooled wall at the same elevation.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method for evaluating the expansion state of a power plant boiler water wall as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method for evaluating the expansion state of a power plant boiler water wall are implemented as described in any one of claims 1 to 7.

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