Intelligent monitoring system and method for boiler furnace expansion monitoring

Abstract

The application discloses an intelligent monitoring system and method for monitoring expansion of a boiler furnace, and the system comprises a workbench, a laser ranging module, an angle measuring module, a first target, a second target and a control device. The system can guarantee the measurement accuracy through laser ranging and angle measurement, can measure the expansion change of the boiler furnace in the vertical direction according to the cosine theorem of a triangle, and can measure the expansion change of the boiler furnace in the horizontal direction according to the Pythagorean theorem of a right triangle. Through the application, the measurement result is more accurate, and the on-site measurement of technical personnel is not needed; the system can be used for online, remote and real-time monitoring, is convenient and efficient, has no operation risk, and the measurement time can be selected at will; a large amount of measurement data can be accumulated, the change trend of the furnace expansion can be formed, and the expansion change of the boiler furnace during the operation of a unit, especially during the load fluctuation of the unit, can be further reflected.

Description

Technical Field

[0001] This invention relates to the field of engineering monitoring, and in particular to an intelligent monitoring system and method for monitoring boiler furnace expansion. Background Technology

[0002] The boiler furnace of a thermal power plant is structurally composed of four water-cooled wall heating surfaces: front, rear, left, and right. The water-cooled wall tubes contain flowing water or steam, and are exposed to heat radiation from the flames inside the boiler furnace. Therefore, during boiler operation, the water-cooled wall tubes expand due to heat. When the boiler load changes, the water-cooled wall tubes will experience relative expansion or contraction. This expansion and contraction is particularly pronounced under conditions of deep peak shaving, where drastic load fluctuations make the furnace expansion and contraction even more significant. Therefore, strengthening the monitoring of boiler furnace expansion is one of the effective means to ensure the safe operation of the boiler.

[0003] Currently, boiler furnace expansion monitoring commonly uses a mechanical coordinate indicator. This indicator consists of a steel pointer and an iron plate marked with a coordinate grid, welded to the monitoring area. The furnace expansion is represented by the change in the pointer's reading on the coordinate grid. Monitoring boiler furnace expansion using mechanical coordinate indicators often has the following problems: First, relying on pointer readings results in low measurement accuracy; second, the environment in which the coordinate indicator is installed is often harsh, making it prone to damage. Some coordinate indicators are poorly positioned, requiring technicians to be on-site for each measurement, which is inconvenient and poses certain safety risks; third, the measurement data is scattered, representing a "discontinuous" measurement method that cannot reflect the trend of furnace expansion changes. Summary of the Invention

[0004] The purpose of this invention is to provide an intelligent monitoring system and method for monitoring boiler furnace expansion, which can realize online, remote, accurate and real-time monitoring of boiler furnace expansion.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An intelligent monitoring system for monitoring boiler furnace expansion includes a workbench, a laser ranging module, an angle measuring module, a first target, a second target, and a control device. The workbench, the first target, and the second target are arranged in the water-cooled wall tube panel of the boiler furnace.

[0007] The laser ranging module and the angle measurement module are both mounted on the worktable. The laser ranging module includes a first laser emitting device and a second laser emitting device, which are connected through the angle measurement module and are rotatable. The angle measurement module is used to measure the angle between the first laser emitting device and the second laser emitting device. The first laser emitting device is used to emit a laser beam and direct the beam onto the first target to measure the distance. The second laser emitting device is used to emit a laser beam and direct the beam onto the second target to measure the distance.

[0008] The workbench is also equipped with a data transmission module, which is used to transmit the measured distance and angle data to the control device, and the control device is used to store and calculate the data.

[0009] Optionally, the laser ranging module has a measurement accuracy of 0.1 mm, and the angle measuring module has a measurement accuracy of 0.05°.

[0010] Optionally, the first laser emitting device is provided with a beam aperture for emitting the light beam generated by the laser source, and the second laser emitting device is provided with a beam aperture for emitting the light beam generated by the laser source.

[0011] Optionally, the first target includes a first target handle, a first target plate, and a first target point, the first target handle and the first target plate being connected, and the first target point being disposed on the first target plate; the second target includes a second target handle, a second target plate, and a second target point, the second target handle and the second target plate being connected, and the second target point being disposed on the second target plate.

[0012] An intelligent monitoring method for boiler furnace expansion, employing the intelligent monitoring system for boiler furnace expansion described in any one of the above-mentioned methods, includes:

[0013] Step S1: Arrange a workbench on one side of the water-cooled wall tube panel in the boiler furnace, and select an upper position and a lower position on the other side of the water-cooled wall tube panel. Arrange the first target and the second target at the upper position and the lower position, respectively.

[0014] Step S2: At the first moment t0 of boiler operation, turn on the first laser emitting device and the second laser emitting device of the laser ranging module, and adjust the rotation of the first laser emitting device and the second laser emitting device respectively, so that the beam emitted by the first laser emitting device is incident on the first target, and the beam emitted by the second laser emitting device is incident on the second target.

[0015] Step S3: The distances to the first target and the second target are measured by the laser ranging module and recorded as a and b, respectively;

[0016] Step S4: The angle measurement module measures the angle between the first laser emitting device and the second laser emitting device of the laser ranging module, and records it as α;

[0017] Step S5: Obtain the distance between the first target and the second target according to the following formula (1), denoted as d, where d represents the vertical distance of the water-cooled wall tubes of the boiler furnace:

[0018]

[0019] Step S6: Obtain the vertical distance from the laser ranging module to the line connecting the first target and the second target according to the following formula (2), denoted as h. Then h represents the horizontal distance of the water-cooled wall tube screen of the boiler furnace:

[0020]

[0021] Step S7: Repeat steps S2 to S6 at the second moment t of boiler operation to obtain the vertical and horizontal distances of the water-cooled wall tubes of the boiler furnace at the second moment t of boiler operation, denoted as d′ and h′ respectively;

[0022] Step S8: Compared to the first time t0, the expansion displacements of the water-cooled wall tubes of the boiler furnace at the second time t are Δd and Δh, respectively, with: Δd = d′ - d, Δh = h′ - h.

[0023] As can be seen from the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0024] By employing laser ranging and angle measurement, measurement accuracy can be guaranteed. The vertical expansion of the boiler furnace can be measured using the law of cosines of a triangle, and the horizontal expansion can be measured using the Pythagorean theorem of a right triangle. This invention provides more accurate measurement results, eliminates the need for on-site technical personnel, and enables online, remote, and real-time monitoring. It is convenient, efficient, and risk-free, with flexible measurement time options, allowing for the accumulation of large amounts of data to establish furnace expansion trends and more accurately reflect the boiler furnace's expansion during unit operation, especially during load fluctuations. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram of the workbench and laser ranging module of an intelligent monitoring system for monitoring boiler furnace expansion according to an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the structure of the first target of an intelligent monitoring system for monitoring boiler furnace expansion according to an embodiment of the present invention;

[0028] Figure 3 A schematic diagram illustrating the application of an intelligent monitoring system for monitoring boiler furnace expansion, provided in an embodiment of the present invention;

[0029] Figure 4 A schematic diagram illustrating the principle of an intelligent monitoring method for monitoring boiler furnace expansion according to an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram illustrating the application of an intelligent monitoring method for monitoring boiler furnace expansion, provided in an embodiment of the present invention.

[0031] The reference numerals in the accompanying drawings include:

[0032] 100-Laser ranging module, 101-First laser emitting device, 102-Second laser emitting device, 103-Angle measuring module, 104-Workbench, 105-First target, 106-Second target, 107-First target plate, 108-First target point, 109-First target handle, 110-Beam aperture, 111-Control device, 112-Water-cooled wall panel. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0034] This embodiment provides an intelligent monitoring system for monitoring boiler furnace expansion, including a workbench 104, a laser ranging module 100, an angle measuring module 103, a first target 105, a second target 106, and a control device 111. The workbench 104, the first target 105, and the second target 106 are arranged on the water-cooled wall tube panel 112 of the boiler furnace.

[0035] The laser ranging module 100 and the angle measuring module 103 are both disposed on the worktable 104. The laser ranging module 100 includes a first laser emitting device 101 and a second laser emitting device 102. The first laser emitting device 101 and the second laser emitting device 102 are connected through the angle measuring module 103 and are rotatable respectively. The angle measuring module 103 is used to measure the angle between the first laser emitting device 101 and the second laser emitting device 102. The first laser emitting device 101 is used to emit a light beam and direct the light beam to the first target 105 to measure the distance. The second laser emitting device 102 is used to emit a light beam and direct the light beam to the second target 106 to measure the distance.

[0036] The workbench 104 is also equipped with a data transmission module, which is used to transmit the measured distance data and angle data to the control device 111. The control device 111 is used to store and calculate the data.

[0037] The first laser emitting device 101 is rotatable, causing the direction of the light beam emitted by the first laser emitting device 101 to change accordingly. The second laser emitting device 102 is rotatable, causing the direction of the light beam emitted by the second laser emitting device 102 to change accordingly. The angle between the first laser emitting device 101 and the second laser emitting device 102 can be considered as the angle between the light emission direction of the first laser emitting device 101 and the light emission direction of the second laser emitting device 102.

[0038] A workbench 104, a first target 105, and a second target 106 are arranged on the water-cooled wall tube panel 112 of the boiler furnace. A first laser emitting device 101 emits a beam of light, which is incident on the first target 105, allowing for the measurement of the distance to the first target 105. A second laser emitting device 102 emits a beam of light, which is incident on the second target 106, allowing for the measurement of the distance to the second target 106. The intelligent monitoring system for boiler furnace expansion monitoring in this embodiment can achieve online, remote, accurate, and real-time monitoring of boiler furnace expansion.

[0039] For example, refer to Figure 1 , Figure 1 The figure shows a schematic diagram of the workbench and laser ranging module of an intelligent monitoring system for monitoring boiler furnace expansion, as provided in one embodiment. As shown, the laser ranging module 100 and the angle measuring module 103 are both disposed on the workbench 104. The first laser emitting device 101 and the second laser emitting device 102 are connected through the angle measuring module 103. The rotating shafts of the first laser emitting device 101 and the second laser emitting device 102 coincide, and both can rotate on the rotating shafts.

[0040] The laser ranging module 100 may be equipped with a laser source that emits a beam. In some embodiments, the first laser emitting device 101 is provided with a beam aperture 110 for emitting the beam generated by the laser source, and the second laser emitting device 102 is provided with a beam aperture 110 for emitting the beam generated by the laser source. This system monitors the expansion of boiler water-cooled wall tubes based on optical distance measurement, improving the measurement accuracy of boiler water-cooled wall expansion monitoring compared to existing mechanical coordinate indicators. The laser ranging module 100 has a measurement accuracy of 0.1 mm, ensuring measurement precision. The angle measurement module 103 has a measurement accuracy of 0.05°, ensuring the accuracy of the measurement results.

[0041] In this embodiment, the structures of the first target 105 and the second target 106 are not limited. In some embodiments, the first target 105 includes a first target handle 109, a first target plate 107, and a first target point 108. The first target handle 109 and the first target plate 107 are connected, and the first target point 108 is disposed on the first target plate 107. The second target may include a second target handle, a second target plate, and a second target point. The second target handle and the second target plate are connected, and the second target point is disposed on the second target plate. The target point disposed on the target plate is used to calibrate the laser emitting device to align with the target, so that the beam emitted by the laser emitting device is incident on the target plate. The target can be fixed to the water-cooled wall tube panel 112 by the target handle, for example, fixed to the fins of the water-cooled wall tube panel 112. See the exemplary embodiment for reference. Figure 2 , Figure 2 The figure shows a schematic diagram of the structure of the first target in an intelligent monitoring system for monitoring boiler furnace expansion, as provided in one embodiment. The first target handle 109 is connected to the first target plate 107, and the first target point 108 is disposed on the first target plate 107. Exemplarily, the first target point 108 or the second target point can be a fluorescent spot, the size of which can be set according to application requirements, such as a diameter of 10 mm.

[0042] The measured distance and angle data are transmitted to the control device 111 via a data transmission module. This data transmission module can be located inside the workbench 104. The control device 111 stores and calculates the data to achieve online monitoring of the expansion of a selected area of ​​the water-cooled wall panel. The control device 111 can be a computer, also known as a computer terminal.

[0043] For example, refer to Figure 3 , Figure 3This is a schematic diagram illustrating the application of an intelligent monitoring system for monitoring boiler furnace expansion, provided as an embodiment. As shown, a first laser emitting device 101 and a second laser emitting device 102 are arranged at corresponding positions along with a workbench 104. A first target 105 and a second target 106 are arranged at different positions. Distance data measured by the laser ranging module 100 and angle data measured by the angle measuring module 103 can be transmitted to a control device 111. The workbench 104 can be fixed to the corresponding positions on the water-cooled wall tube panel 112 by welding, and the first target 105 and the second target 106 can be fixed to the corresponding positions on the water-cooled wall tube panel 112 by welding.

[0044] This embodiment also provides an intelligent monitoring method for boiler furnace expansion monitoring, which applies the intelligent monitoring system for boiler furnace expansion monitoring described in any of the above embodiments, and includes the following steps:

[0045] Step S1: Arrange a workbench 104 on one side of the water-cooled wall tube panel 112 in the boiler furnace, and select an upper position and a lower position on the other side of the water-cooled wall tube panel 112. Arrange the first target 105 and the second target 106 at the upper position and the lower position, respectively.

[0046] Step S2: At the first moment t0 when the boiler is running, turn on the first laser emitting device 101 and the second laser emitting device 102 of the laser ranging module 100, and adjust the rotation of the first laser emitting device 101 and the second laser emitting device 102 respectively, so that the beam emitted by the first laser emitting device 101 is incident on the first target 105, and the beam emitted by the second laser emitting device 102 is incident on the second target 106.

[0047] Step S3: The laser ranging module 100 measures the distances to the first target 105 and the second target 106 respectively, and records them as a and b respectively;

[0048] Step S4: The angle measurement module 103 measures the included angle between the first laser emitting device 101 and the second laser emitting device 102 of the laser ranging module 100, and denots it as α;

[0049] Step S5: Obtain the distance between the first target 105 and the second target 106 according to the following formula (1), denoted as d, where d represents the vertical distance of the water-cooled wall tube panel 112 of the boiler furnace:

[0050]

[0051] Step S6: Obtain the vertical distance from the laser ranging module 100 to the line connecting the first target 105 and the second target 106 according to the following formula (2), denoted as h. Then, h represents the horizontal distance of the water-cooled wall tube panel 112 of the boiler furnace:

[0052]

[0053] Step S7: Repeat steps S2 to S6 at the second moment t of boiler operation to obtain the vertical and horizontal distances of the water-cooled wall tubes 112 of the boiler furnace at the second moment t of boiler operation, denoted as d′ and h′ respectively;

[0054] Step S8: Compared to the first time t0, the expansion displacements of the water-cooled wall tube panel 112 of the boiler furnace at the second time t are Δd and Δh, respectively, with: Δd = d′ - d, Δh = h′ - h.

[0055] Select the water-cooled wall tube panel 112 of the boiler furnace, and arrange the workbench 104 on one side fin of the selected water-cooled wall tube panel 112. Select two positions, upper and lower, on the other side fin of the water-cooled wall tube panel 112, and arrange the first target 105 and the second target 106 at the upper and lower positions respectively.

[0056] The first laser emitting device 101 and the second laser emitting device 102 can be activated by the control device 111. Specifically, the control device 111 can activate the laser sources of the first laser emitting device 101 and the second laser emitting device 102 of the laser ranging module 100. The control device 111 can also control the rotation of the first laser emitting device 101 and the second laser emitting device 102. The distance data measured by the laser ranging module 100 and the angle data measured by the angle measurement module 103 can be transmitted to the control device 111 through the data transmission module of the worktable 104, where the control device 111 stores and calculates the data.

[0057] For reference Figure 3 and Figure 4 , Figure 4This is a schematic diagram illustrating the principle of an intelligent monitoring method for monitoring boiler furnace expansion, provided in one embodiment. The laser source in the laser ranging module 100 can be denoted as point C. The first target 105 and the second target 106 can be denoted as points A and B, respectively. Points A, B, and C form a triangle, △ABC. The beam emitted by the first laser emitting device 101 strikes the first target 105, which can be considered as side AC of △ABC. The distance from the first laser emitting device 101 to the first target 105 is the length of side AC, denoted as a. Similarly, the beam emitted by the second laser emitting device 102 strikes the second target 106, which can be considered as side BC of △ABC. The distance from the second laser emitting device 102 to the second target 106 is the length of side BC, denoted as b. Connecting point A (representing the first target 105) and point B (representing the second target 106) forms side AB of △ABC. The length of side AB represents the distance between the first target 105 and the second target 106, denoted as d.

[0058] The angle measurement module 103 can measure the included angle between the first laser emitting device 101 and the second laser emitting device 102, denoted as α, i.e., ∠ACB=α. According to the triangle cosine theorem, the side length d of side AB can be calculated as follows:

[0059]

[0060] If the line connecting the first target 105 and the second target 106 is parallel to the water-cooled wall tube, the calculated distance d can be considered as the vertical distance of the water-cooled wall tube screen 112.

[0061] Furthermore, in △ABC, draw a line segment CO perpendicular to side AB through point C, with point O being the intersection point of CO and side AB. The height CO of side AB in △ABC, denoted as h, represents the perpendicular distance from the laser source of the laser ranging module 100 to the line connecting the first target 105 and the second target 106. Height CO divides △ABC into two right triangles, right triangle AOC and right triangle BOC. Let the length of side BO be x, then the length of side AO be dx. Using the Pythagorean theorem for right triangles, the length h of height CO can be calculated as follows:

[0062]

[0063] If the straight line containing the first target 105 and the second target 106 is parallel to the water-cooled wall tube, the calculated distance h can be considered as the horizontal distance of the water-cooled wall tube screen 112.

[0064] The following detailed description uses the intelligent monitoring system and method of this embodiment to illustrate the expansion monitoring during the start-up and shutdown process of a power plant boiler water-cooled wall panel. Please refer to [link / reference]. Figure 5 The specific steps are as follows:

[0065] Step 1: Taking the water-cooled wall tube panel 112 of the boiler furnace front wall as the object to be tested, select the area to be tested, and fix the workbench 104 on one side of the selected area of ​​the water-cooled wall tube panel 112 by welding; select two positions, upper and lower, on the other side of the selected area, and fix the target handle of the first target 105 and the target handle of the second target 106 by welding, and keep the target plate of the first target 105 and the target plate of the second target 106 parallel to the water-cooled wall tube.

[0066] Step 2: When the unit is shut down, the laser sources of the first laser emitting device 101 and the second laser emitting device 102 of the laser ranging module 100 are turned on by the control device 111 and the rotation is adjusted so that the two laser beams fall on the target point of the first target 105 and the target point of the second target 106 respectively.

[0067] Step 3: Measure the distances from the laser source to the two target points using the laser ranging module 100, and record them as a and b respectively, where a = 14007.21 mm and b = 14543.61 mm. Transmit the distance data to the control device 111 via the data transmission module of the worktable 104.

[0068] Step 4: Measure the angle between the first laser emitting device 101 and the second laser emitting device 102 using the angle measurement module 103, and record it as α, where α = 15.45°. Transmit the angle data to the control device 111 via the data transmission module of the worktable 104.

[0069] Step 5: The control device 111 calculates and stores the above measurement data. Based on the triangle cosine theorem, the vertical distance between the upper and lower target points of the water-cooled wall panel 112 can be obtained, denoted as d, and we have:

[0070]

[0071] Substituting the measurement results a, b, and α into the above formula, we obtain d = 3872.46 mm.

[0072] Step 6: The control device 111 calculates and stores the above measurement data. The horizontal distance of the water-cooled wall panel 112 can be calculated using the Pythagorean theorem of right triangles, denoted as h, and we have:

[0073]

[0074] Similarly, substituting the measurement results a, b, and α into the above formula, we obtain h = 14014.15 mm.

[0075] Step 7: After the unit is ignited, started, and runs stably, repeat steps 2-3 above. Measure the distances from the laser source to the two target points using the laser ranging module 100, denoted as a' and b' respectively, where a' = 14179.28 mm and b' = 14621.71 mm. Repeat step 4 above, and measure the angle between the first laser emitting device 101 and the second laser emitting device 102 using the angle measuring module 103, denoted as α′, where α′ = 15.60°. Repeat step 5 above to calculate the vertical and horizontal distances of the furnace water-cooled wall tube panel 112 after boiler startup, denoted as d′ and h′ respectively, and we have:

[0076]

[0077] Similarly, substituting the measurement results a′, b′ and α′ into the above formula, we obtain d′=3933.24mm and h′=14175.05mm.

[0078] Step 8: During boiler start-up and shutdown, the expansion displacements of the water-cooled wall tube panel 112 in the boiler furnace are Δd and Δh, respectively, and we have: Δd = d′ - d, Δh = h′ - h.

[0079] Similarly, substituting the above calculation results d, d′, h and h′ into the above formula, we get △d = 60.78mm and △h = 160.90mm, which means that during the boiler start-up and shutdown process, the expansion of the boiler front wall water-cooled wall tube panel 112 in the vertical direction is 60.78mm and the expansion in the horizontal direction is 160.90mm.

[0080] Thus, the intelligent monitoring system and method in this embodiment have completed the expansion monitoring of the water-cooled wall tube panel on the front wall of the boiler furnace during the boiler start-up and shutdown process. Of course, according to this embodiment, the monitoring system can be installed on selected areas of the water-cooled wall tube panel on the rear wall and side wall of the boiler furnace to realize the expansion monitoring of the entire furnace.

[0081] The intelligent monitoring device and method for monitoring boiler furnace expansion provided by this invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make several improvements and modifications to this invention without departing from the principles of this invention, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. An intelligent monitoring system for monitoring boiler furnace expansion, characterized in that, It includes a workbench (104), a laser ranging module (100), an angle measuring module (103), a first target (105), a second target (106), and a control device (111). The workbench (104), the first target (105), and the second target (106) are used to be arranged in the water-cooled wall tube panel of the boiler furnace. The laser ranging module (100) and the angle measuring module (103) are both disposed on the worktable (104). The laser ranging module (100) includes a first laser emitting device (101) and a second laser emitting device (102). The first laser emitting device (101) and the second laser emitting device (102) are connected through the angle measuring module (103) and are rotatable respectively. The angle measuring module (103) is used to measure the angle between the first laser emitting device (101) and the second laser emitting device (102). The first laser emitting device (101) is used to emit a light beam and direct the light beam to the first target (105) to measure the distance. The second laser emitting device (102) is used to emit a light beam and direct the light beam to the second target (106) to measure the distance. The workbench (104) is also provided with a data transmission module, which is used to transmit the measured distance data and angle data to the control device (111), and the control device (111) is used to store and calculate the data. The method of applying the intelligent monitoring system for monitoring boiler furnace expansion includes: Step S1: Arrange a workbench (104) on one side of the water-cooled wall tube screen in the boiler furnace, select an upper position and a lower position on the other side of the water-cooled wall tube screen, and arrange the first target (105) and the second target (106) at the upper position and the lower position respectively; Step S2: At the first moment t0 when the boiler is running, turn on the first laser emitting device (101) and the second laser emitting device (102) of the laser ranging module (100), and adjust the rotation of the first laser emitting device (101) and the second laser emitting device (102) respectively, so that the beam emitted by the first laser emitting device (101) is incident on the first target (105), and the beam emitted by the second laser emitting device (102) is incident on the second target (106). Step S3: The distances to the first target (105) and the second target (106) are measured by the laser ranging module (100) respectively, and recorded as a and b respectively; Step S4: The angle between the first laser emitting device (101) and the second laser emitting device (102) of the laser ranging module (100) is measured by the angle measuring module (103) and denoted as α; Step S5: Obtain the distance between the first target (105) and the second target (106) according to the following formula (1), denoted as d, where d represents the vertical distance of the water-cooled wall tubes of the boiler furnace: ； （1） Step S6: Obtain the vertical distance from the laser ranging module (100) to the line connecting the first target (105) and the second target (106) according to the following formula (2), denoted as h. Then, h represents the horizontal distance of the water-cooled wall tube screen of the boiler furnace: ； （2） Step S7: Repeat steps S2 to S6 at the second moment t of boiler operation to obtain the vertical and horizontal distances of the water-cooled wall tubes of the boiler furnace at the second moment t of boiler operation, denoted as d´ and h´ respectively; Step S8: Compared to the first time t0, the expansion displacements of the water-cooled wall tubes of the boiler furnace at the second time t are Δd and Δh, respectively, with: Δd = d´-d, Δh = h´-h.

2. The intelligent monitoring system for boiler furnace expansion monitoring according to claim 1, characterized in that, The laser ranging module (100) has a measurement accuracy of 0.1 mm, and the angle measuring module (103) has a measurement accuracy of 0.05°.

3. The intelligent monitoring system for boiler furnace expansion monitoring according to claim 1, characterized in that, The first laser emitting device (101) is provided with a beam aperture (110) for emitting the light beam generated by the laser source, and the second laser emitting device (102) is provided with a beam aperture (110) for emitting the light beam generated by the laser source.

4. The intelligent monitoring system for boiler furnace expansion monitoring according to claim 1, characterized in that, The first target (105) includes a first target handle (109), a first target plate (107) and a first target point (108). The first target handle (109) and the first target plate (107) are connected, and the first target point (108) is disposed on the first target plate (107). The second target includes a second target handle, a second target plate and a second target point. The second target handle and the second target plate are connected, and the second target point is disposed on the second target plate.

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