Calibration device for magnetic flux leakage detector of boiler membrane water-cooled wall

Abstract

The utility model discloses a calibration device of a boiler membrane type water wall magnetic flux leakage detector, which comprises a base and a boiler membrane type water wall simulation assembly rotatably supported on the base, the boiler membrane type water wall simulation assembly comprises a plurality of water pipes arranged side by side, fins are welded between two adjacent water pipes, and the fins are welded on the base. At least one water pipe of the boiler membrane water wall simulation assembly is provided with a simulation defect. According to the utility model, actual defects appearing on the boiler membrane water-cooled wall can be accurately detected, and accurate calibration of the magnetic flux leakage detector is realized, so that the detection accuracy of the magnetic flux leakage detector is ensured.

Description

[Technical field]

[0001] The utility model belongs to the field of special detection technology, and in particular relates to a calibration device for a boiler membrane water-cooled wall magnetic leakage detector. [Background technology]

[0002] The heating surface arranged around the furnace, where the flowing medium in the tube is generally water or a mixture of steam and water, and is mainly cooled by water, is called the furnace water-cooled wall. The main functions of the water-cooled wall are:

[0003] (1) Absorbing the radiant heat from the high-temperature flame or flue gas in the furnace to heat the water into saturated steam;

[0004] (2) Protect the furnace wall, simplify the furnace wall structure, and reduce the weight of the furnace wall. This is mainly because the water-cooled wall absorbs the radiant heat in the furnace, which reduces the temperature of the furnace wall;

[0005] (3) Absorbing the heat in the furnace and cooling the flue gas to the temperature allowed by the furnace outlet, which is beneficial to reducing slagging in the furnace and preventing slagging at the furnace outlet;

[0006] (4) The water-cooled wall absorbs radiant heat at high temperatures inside the furnace and has a good heat transfer effect, thus reducing boiler steel consumption and boiler construction costs.

[0007] The membrane water-cooled wall is a steel pipe connected into a whole with flat steel. Its advantage is the best protection for the furnace wall, which greatly reduces the weight and thickness of the furnace wall. In addition, the membrane water-cooled wall has good air tightness, which greatly reduces the air leakage in the furnace and improves the thermal efficiency of the boiler. Large-capacity, high-temperature and high-pressure boilers mostly use membrane water-cooled walls.

[0008] The boiler membrane water-cooled wall works under high temperature and high pressure. It is impacted by the high-temperature flue gas and water flow of the furnace. The surface covering layer is easily damaged, thereby exposing the metal material underneath, causing high-temperature corrosion. Common forms of high-temperature corrosion include oxidation corrosion, sulfide corrosion, chlorination corrosion, alkali corrosion, etc. The corrosion on the flue gas side of the boiler heating surface proceeds quite quickly. The corrosion caused by the heating surface of the boiler seriously affects the safety and economy of the boiler and affects the availability of the power station unit. Therefore, detection is required. The applicant has developed a technology that uses a leakage magnetic detector for detection, but the leakage magnetic detector is usually a general detection device. If it is not calibrated according to the detection requirements of the boiler membrane water-cooled wall, the boiler membrane water-cooled wall cannot be accurately detected. [Contents of the utility model]

[0009] In view of the deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a calibration device for a boiler membrane water-cooled wall magnetic flux leakage detector, so as to solve the problem of calibrating the magnetic flux leakage detector according to the specific detection requirements of the boiler membrane water-cooled wall.

[0010] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0011] A calibration device for a boiler membrane water-cooled wall magnetic flux leakage detector comprises a base and a boiler membrane water-cooled wall simulation component rotatably supported on the base, wherein the boiler membrane water-cooled wall simulation component comprises a plurality of water pipes arranged side by side, fins are welded between two adjacent water pipes, and at least one water pipe of the boiler membrane water-cooled wall simulation component is provided with a simulated defect.

[0012] Preferably, each water pipe is provided with a plurality of simulated defects.

[0013] Preferably, the same type of simulated defects are arranged on the same water pipe, and the sizes of the simulated defects distributed along the axial direction are different.

[0014] Preferably, the simulated defects include flat-bottom holes on the inner wall, flat-bottom holes on the outer wall, wear and grooves on the outer wall of the tube, and fin wear defects are provided on the fins.

[0015] Preferably, the base includes a rectangular bottom frame and a tripod arranged side by side on the left and right sides of the bottom frame, a rotating shaft seat is provided on the top of the tripod, the boiler membrane water-cooled wall simulation assembly is connected to a rotating shaft, and the rotating shaft is rotatably supported on the rotating shaft seat.

[0016] Preferably, the bottom frame and the tripod are welded from square steel, and the bottom frame and the tripod are welded into one body.

[0017] Preferably, the calibration device also includes an angle adjustment component arranged between the base and the boiler membrane water-cooled wall simulation component, through which the angle of the boiler membrane water-cooled wall simulation component is adjusted, and the boiler membrane water-cooled wall simulation component has at least two states: vertical and horizontal.

[0018] Preferably, the angle adjustment assembly includes a turntable fixed to the rotating shaft and a fixed plate fixed to the base, the turntable has a plurality of angle adjustment holes distributed along the circumference, and the fixed plate is connected to an angle positioning pin that cooperates with one of the angle adjustment holes.

[0019] Preferably, the outer diameter of the water pipe is 51 mm, the wall thickness is 4 mm, and the thickness of the fin is 5 mm; or, the outer diameter of the water pipe is 60 mm, the wall thickness is 5 mm, and the thickness of the fin is 5 mm.

[0020] Preferably, the center distance between two adjacent water pipes is 90 mm, the total width of the boiler membrane water-cooled wall simulation assembly is 1400 mm to 1600 mm, and the total height of the boiler membrane water-cooled wall simulation assembly is ≤3000 mm.

[0021] The utility model adopts the above technical solution and has the following beneficial effects:

[0022] The boiler membrane water-cooled wall simulation component includes a number of water tubes arranged side by side, and fins are welded between two adjacent water tubes. Since the actual membrane water-cooled wall is not completely vertical, the boiler membrane water-cooled wall simulation component can rotate on the base to simulate the state of the actual membrane water-cooled wall. Since the structure of the boiler membrane water-cooled wall simulation component is similar to that of the membrane water-cooled wall, the membrane water-cooled wall can be accurately simulated.

[0023] Since at least one water tube of the boiler membrane water-cooled wall simulation assembly is provided with a simulated defect, wherein the simulated defect is set according to common actual defects of the membrane water-cooled wall, various defects occurring in the water tube in actual use can be accurately simulated.

[0024] Therefore, compared with the existing technology, since the actual defects on the membrane water-cooled wall can be accurately simulated, the problem of calibration of the leakage magnetic detector for the specific detection needs of the boiler membrane water-cooled wall can be solved, and the precise calibration of the leakage magnetic detector can be achieved to ensure the detection accuracy of the leakage magnetic detector.

[0025] These features and advantages of the present invention will be disclosed in detail in the following specific implementation manners and drawings.

Brief Description of the Drawings

[0026] The utility model is further described below in conjunction with the accompanying drawings:

[0027] Figure 1 This is a schematic diagram of the structure of the calibration device of the utility model boiler membrane water wall magnetic leakage detector Figure 1 ;

[0028] Figure 2 for Figure 1 The enlarged structural diagram at A in the middle;

[0029] Figure 3 for Figure 1 The enlarged structural diagram at B in the middle;

[0030] Figure 4 for Figure 1 The enlarged structural diagram at C in the middle;

[0031] Figure 5 This is a schematic diagram of the structure of the calibration device of the utility model boiler membrane water wall magnetic leakage detector Figure 2 ;

[0032] Figure 6 for Figure 5 The enlarged structural diagram at D in the middle;

[0033] Figure numerals: base 1, bottom frame 11, tripod 12, rotating shaft seat 13, boiler membrane water-cooled wall simulation component 2, water pipe 21, outer wall flat-bottom hole 211, groove 212, fin 22, rotating shaft 23, angle adjustment component 3, turntable 31, angle adjustment hole 311, fixed plate 32. [Specific implementation method]

[0034] The following is an explanation and description of the technical scheme of the embodiment of the utility model in conjunction with the drawings of the embodiment of the utility model, but the following embodiment is only a preferred embodiment of the utility model, not all. Based on the embodiment in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the utility model.

[0035] Those skilled in the art will appreciate that, in the absence of conflict, the features in the following embodiments and implementations may be combined with each other.

[0036] The terms used in the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. For example, the following words indicating orientation or positional relationship, such as "inside", "outside", "front", "back", etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0037] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In addition, in the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Reference Figures 1 to 6As shown, this embodiment provides a calibration device for a boiler membrane water wall magnetic leakage detector, comprising a base 1 and a boiler membrane water wall simulation component 2 rotatably supported on the base. The boiler membrane water wall simulation component 2 comprises a plurality of water pipes 21 arranged side by side, fins 22 are welded between two adjacent water pipes 21, and at least one water pipe of the boiler membrane water wall simulation component 2 is provided with a simulated defect. The water pipe is a steel pipe, and the fin is a flat steel.

[0040] Since the actual membrane water-cooled wall is not completely vertical, the boiler membrane water-cooled wall simulation component can rotate on the base to simulate the state of the actual membrane water-cooled wall. Since the structure of the boiler membrane water-cooled wall simulation component is similar to that of the membrane water-cooled wall, the membrane water-cooled wall can be accurately simulated.

[0041] Since at least one water tube of the boiler membrane water-cooled wall simulation assembly is provided with a simulated defect, wherein the simulated defect is set according to common actual defects of the membrane water-cooled wall, various defects occurring in the water tube in actual use can be accurately simulated.

[0042] Therefore, compared with the existing technology, since the actual defects on the membrane water-cooled wall can be accurately simulated, the problem of calibration of the leakage magnetic detector for the specific detection needs of the boiler membrane water-cooled wall can be solved, and the precise calibration of the leakage magnetic detector can be achieved to ensure the detection accuracy of the leakage magnetic detector.

[0043] It is understandable that multiple simulated defects are set on each water pipe. In addition, the same simulated defect can be set on the same water pipe, and the sizes of the simulated defects distributed along the axial direction are different. Of course, multiple simulated defects can also be set on the same water pipe. That is, the actual defects on the water pipe should be simulated as much as possible, and at the same time, it should be convenient for the magnetic flux leakage detector to be calibrated.

[0044] With reference to the common defects of membrane water-cooled walls in the prior art, simulated defects are set accordingly. The simulated defects include inner wall flat-bottom holes, outer wall flat-bottom holes 211, tube outer wall wear and grooves 212, and fin wear defects are simulated on the fins. Figure 3 The simulated defect of the flat bottom hole on the outer wall is specifically shown. Figure 4 The groove simulation defect is specifically illustrated.

[0045] Specifically, the base 1 includes a rectangular bottom frame 11 and a tripod 12 arranged side by side on the left and right sides of the bottom frame, a rotating shaft seat 13 is provided on the top of the tripod, and the boiler membrane water-cooled wall simulation assembly is connected to a rotating shaft 23, and the rotating shaft is rotatably supported on the rotating shaft seat. The bottom frame and the tripod are welded from square steel, and the bottom frame and the tripod are welded as a whole. Since the boiler membrane water-cooled wall simulation assembly is large in size and weight, in order to facilitate movement and loading and unloading, the base is a frame structure to reduce the total weight of the device as much as possible. In addition, the rotating shaft seat and the tripod are connected by bolts, which is convenient for separation from the boiler membrane water-cooled wall simulation assembly and for separate movement and loading and unloading. And lifting auxiliary devices such as lifting ears can be set at reasonable positions on the boiler membrane water-cooled wall simulation assembly and the base.

[0046] Furthermore, the calibration device also includes an angle adjustment component 3 disposed between the base 1 and the boiler membrane water-cooled wall simulation component 2, through which the angle of the boiler membrane water-cooled wall simulation component is adjusted, and the boiler membrane water-cooled wall simulation component has at least two states, vertical and horizontal. When it is kept vertical, the magnetic flux leakage detection instrument test can be performed, and when it is horizontal, it is convenient to use other non-destructive testing methods to re-inspect the prefabrication defects.

[0047] As an implementation method, Figure 5 and Figure 6 As shown, the angle adjustment assembly 3 includes a rotating disk 31 fixed to the rotating shaft and a fixed disk 32 fixed to the base, the rotating disk 31 has a plurality of angle adjustment holes 311 distributed along the circumference, and the fixed disk 32 is connected to an angle positioning pin matched with one of the angle adjustment holes. The plurality of angle adjustment holes do not need to be arranged in the entire circumference, and the positions and number of the plurality of angle adjustment holes can at least ensure that the boiler membrane water-cooled wall simulation assembly is fixedly supported in both horizontal and vertical positions.

[0048] Currently, there are two main specifications of membrane water-cooled wall tubes for common power station boilers, as shown in Table 1.

[0049] Table 1: Common membrane water wall parameters of power station boilers (unit: mm)

[0050]

[0051] Since the parameters of the membrane water-cooled wall in Table 1 are not much different, among which Φ51×4mm is currently more common, it is planned to select the membrane water-cooled wall according to this specification for trial production. Specifically, the outer diameter of the water pipe is 51mm, the wall thickness is 4mm, the thickness of the fin is 5mm, the center distance between two adjacent water pipes is 90mm, the total width of the boiler membrane water-cooled wall simulation component is 1400mm~1600mm, and the total height of the boiler membrane water-cooled wall simulation component is ≤3000mm. Alternatively, it can also be set like this: the outer diameter of the water pipe is 60mm, the wall thickness is 5mm, and the thickness of the fin is 5mm.

[0052] The membrane water-cooled wall specimens are as consistent as possible with the material selection of real power plant boilers. Therefore, the main material grades and implementation standards of the boiler membrane water-cooled wall simulation components refer to the existing boiler manufacturing material selection, as shown in Table 2.

[0053] Table 2: Main materials of membrane water-cooled wall specimens

[0054]

[0055] Among them, the specific size parameters of prefabrication defects are shown in Table 3, Table 4 and Table 5.

[0056] Table 3: Flat bottom hole (inside and outside wall) defect size parameters (unit: mm)

[0057]

[0058] For the processing of flat-bottom holes, the spacing between holes shall be at least 200mm, and the distance between the holes at both ends and the edge shall be no less than 300mm.

[0059] Table 4: Size parameters of tube outer wall and fin wear defects (unit: mm)

[0060]

[0061] Table 5: Notch defect size parameters (unit: mm)

[0062]

[0063] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Those skilled in the art should understand that the utility model includes but is not limited to the contents described in the drawings and the above specific implementation. Any modification that does not deviate from the functional and structural principles of the utility model will be included in the scope of the claims.

Claims

1. The calibration device of boiler membrane water wall magnetic leakage detector is characterized by: It includes a base and a boiler membrane water-cooled wall simulation component rotatably supported on the base, the boiler membrane water-cooled wall simulation component includes a plurality of water pipes arranged side by side, fins are welded between two adjacent water pipes, and at least one water pipe of the boiler membrane water-cooled wall simulation component is provided with a simulated defect.

2. The calibration device for the boiler membrane water wall magnetic flux leakage detector according to claim 1 is characterized in that: Each water pipe is equipped with multiple simulated defects.

3. The calibration device for the boiler membrane water wall magnetic flux leakage detector according to claim 2 is characterized in that: The same simulated defect is set on the same water pipe, and the sizes of the simulated defects distributed along the axial direction are different.

4. The calibration device for the boiler membrane water wall magnetic flux leakage detector according to claim 1 is characterized in that: The simulated defects include inner wall flat-bottom holes, outer wall flat-bottom holes, tube outer wall wear and notches, and the fins are provided with fin wear defects.

5. The calibration device for the boiler membrane water wall magnetic flux leakage detector according to claim 1 is characterized in that: The base includes a rectangular bottom frame and tripods arranged side by side on the left and right sides of the bottom frame, a rotating shaft seat is provided on the top of the tripod, the boiler membrane water-cooled wall simulation component is connected with a rotating shaft, and the rotating shaft is rotatably supported on the rotating shaft seat.

6. The calibration device for the boiler membrane water wall magnetic flux leakage detector according to claim 5 is characterized in that: The bottom frame and the tripod are welded from square steel, and the bottom frame and the tripod are welded into one body.

7. The calibration device for the boiler membrane water wall magnetic flux leakage detector according to claim 5, characterized in that: The calibration device also includes an angle adjustment component arranged between the base and the boiler membrane water-cooled wall simulation component, through which the angle of the boiler membrane water-cooled wall simulation component is adjusted, and the boiler membrane water-cooled wall simulation component has at least two states: vertical and horizontal.

8. The calibration device for the boiler membrane water wall magnetic flux leakage detector according to claim 7, characterized in that: The angle adjustment assembly includes a rotating disk fixed to the rotating shaft and a fixed disk fixed to the base. The rotating disk is provided with a plurality of angle adjustment holes distributed along the circumference. The fixed disk is connected with an angle positioning pin matched with one of the angle adjustment holes.

9. The calibration device for the boiler membrane water wall magnetic flux leakage detector according to claim 1, characterized in that: The outer diameter of the water pipe is 51 mm, the wall thickness is 4 mm, and the thickness of the fin is 5 mm; or, the outer diameter of the water pipe is 60 mm, the wall thickness is 5 mm, and the thickness of the fin is 5 mm.

10. The calibration device for the boiler membrane water wall magnetic flux leakage detector according to claim 9, characterized in that: The center distance between two adjacent water pipes is 90 mm, the total width of the boiler membrane water-cooled wall simulation component is 1400 mm to 1600 mm, and the total height of the boiler membrane water-cooled wall simulation component is ≤3000 mm.

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