Boiler burner cutting circle positioning tool and positioning method

Abstract

The present invention provides a boiler burner cutting circle positioning tool and positioning method, the boiler burner cutting circle positioning tool comprises: a laser rangefinder; a leveling tool, located on the side of the laser rangefinder, the straight outer edge of the leveling tool is parallel to the axial direction of the laser rangefinder, the inner edge of the leveling tool is connected to the laser rangefinder through a connecting component; a level, fixedly set on the laser rangefinder or the leveling tool. The beneficial effect of the present invention is that the laser rangefinder is used in the embodiment of the present invention to measure the straight-line distance and replace the steel wire commonly used in the prior art, which can avoid the problem of positioning deviation caused by the bending and deformation of the steel wire due to gravity in the prior art, and achieve the purpose of accurately positioning the imaginary cutting circle.

Description

Technical Field

[0001] The invention relates to a boiler burner cutting circle positioning tool and a positioning method. Background Art

[0002] Tangential combustion is an important combustion organization type of boiler. Compared with the swirl combustion method, it has the advantages of simpler burner adjustment mechanism and stronger combustion stability. Therefore, it is widely used in pulverized coal combustion boilers in my country. The imaginary tangential circle radius is one of the key design parameters of tangential circle combustion. The designed tangential circle radius should be strictly guaranteed when positioning the burner. A tangential circle radius that is too large may cause problems such as slagging of the furnace water-cooled wall. A tangential circle radius that is too small is not conducive to the ignition and burnout of pulverized coal. The burner installation specification stipulates the angle between the burner jet and the water-cooled wall on the horizontal section of the furnace. The deviation between the actual value and the design value should not be greater than ±0.5o to ensure the designed tangential circle radius.

[0003] Prior art solution 1: Build a scaffolding along the water-cooled wall at the plane elevation near the lower edge of the burner, build a corridor along the diagonal line of the furnace, find the center of the furnace, and fix a circular template with the same radius as the imaginary tangent circle at the center of the furnace. Pull a steel wire at the nozzle of each corner burner to be tangent to the circular template, pull the steel wire from the front and back of the burner nozzle to determine the nozzle center line, and adjust the angle between the burner nozzle center line and the circular template tangent line to no more than ±0.5°. For details, see Discussion on the Installation Process of Supercritical Four-corner Tangential Boiler Burner (Yang Jizhou, Guangdong Science and Technology, 2007, (171): 124-125).

[0004] Disadvantages of the existing technical solution 1: 1. It takes a lot of work to find the center of the furnace, mainly because it takes a lot of time and effort to set up scaffolding and diagonal corridors. 2. Under the action of gravity, the steel wire will bend and deform, and cannot represent a strict straight line, resulting in deviation in positioning. The larger the size of the furnace, the more serious this deviation. 3. It is also time-consuming to determine the center line of the burner nozzle, and it is easy to cause large human errors.

[0005] Existing technical solution 2: Place a steel wire from the nozzle outlet to the boiler rear wall, spot weld a positioning round steel on the fin of the boiler rear wall, and engrave a positioning point on the positioning round steel, the positioning point is 92mm away from the edge of the fixed side pipe mouth of the rear wall; this steel wire passes through the inside of the nozzle mouth and ensures that the centers of the inner and outer nozzles coincide, and is tightened; adjust the angle of the burner so that the steel wire rope is within 329mm or 335mm on both sides of the positioning point, record the data and calculate the nozzle centerline angle through trigonometric calculation, when the calculated value and the theoretical value deviation are within the allowable range, the tangent angle of the burner centerline meets the requirements, and the nozzle alignment is completed. For details, please refer to a tangent-type pulverized coal burner installation method (application number 201910415166.2).

[0006] Disadvantages of the second existing technical solution: 1. Due to gravity, the steel wire connecting the nozzle and the rear wall of the furnace will bend and deform, and cannot represent a strict straight line, resulting in deviation in positioning. The larger the size of the furnace, the more serious this deviation. 2. It is also time-consuming to determine the center line of the burner nozzle and is prone to large human errors.

[0007] Existing technical solution three: The tangent circle alignment of the burner uses the intersection of the tangent line (the center line of the primary air inner nozzle and the outer interface) and the parallel lines of the four sides of the water-cooled wall boundary line to form a certain angle. Take a point on each of the two lines so that the distance from the two points to the intersection of the two lines is equal, and measure the straight line distance between the two points (i.e., dimension a), as shown in the figure above. With the help of CAD computer drawing software, calculate the straight line length corresponding to the angle required by the drawing, and check it with the actual straight line distance between the two points (i.e., dimension b). If there is a deviation, continue to adjust the burner angle until the theoretical straight line length is reached. For details, refer to the improvement of the installation and alignment method of the four-corner tangent circle burner of the supercritical boiler (Li Junxi, Internal Combustion Engine and Accessories, 2017, (24): 79-81).

[0008] Disadvantages of the existing technical solution 3: 1. Due to the limitation of the space outside the furnace, the dimensions a and b cannot be selected to be very large. According to the triangle similarity principle, the measurement and positioning errors of a and b will be magnified in the furnace. The larger the furnace size, the more serious the error amplification effect. 2. It is also time-consuming to determine the center line of the burner nozzle and is prone to large human errors.

[0009] Tangential combustion means: a group of burners located at the same level, the jet center line from the opposite direction of the same imaginary tangential circle tangent to the boiler combustion organization. Here the number of burners in a group is 2N, where N is an arbitrary natural number. Common tangential combustion types include four-corner tangential circle, hexagonal tangential circle and octagonal tangential circle. Summary of the invention

[0010] The invention provides a boiler burner tangential circle positioning tool and a positioning method to achieve the purpose of positioning an imaginary tangential circle.

[0011] The technical solution adopted by the present invention to solve its technical problem is: a boiler burner cutting circle positioning tool, comprising: a laser rangefinder; a leveling tool, located on the side of the laser rangefinder, the straight outer edge of the leveling tool is parallel to the axial direction of the laser rangefinder, and the inner edge of the leveling tool is connected to the laser rangefinder through a connecting component; a spirit level, fixedly arranged on the laser rangefinder or the leveling tool.

[0012] Furthermore, a circumferential groove is provided on the outer periphery of the laser rangefinder, one end of the connecting component is fixedly connected to the inner edge of the leveling tool, and the other end of the connecting component is placed in the circumferential groove, and the leveling tool can rotate around the axis of the laser rangefinder together with the connecting component.

[0013] Further, there are two connecting components, and the two connecting components are arranged in parallel at both ends of the leveling tool at intervals.

[0014] Further, a level is arranged on the leveling tool.

[0015] Further, one end of the connecting component is fixedly connected to the inner edge of the leveling tool, and the other end of the connecting component is fixedly connected to the outer peripheral surface of the laser rangefinder.

[0016] Further, there are two leveling tools, and the two leveling tools are symmetrically arranged on both sides of the laser rangefinder, and each leveling tool is correspondingly connected with a connecting component.

[0017] Further, each leveling tool is correspondingly connected to two connecting components, and the two connecting components are arranged in parallel at both ends of the leveling tool at intervals.

[0018] Further, a level is arranged on the laser rangefinder.

[0019] The present invention also provides a method for positioning the tangential circle of a boiler burner. The positioning operation is carried out by using the above-mentioned boiler burner tangential circle positioning tool. The method for positioning the tangential circle of a boiler burner includes the following steps: Step 10: Check whether the burner is in a horizontal position through a level; Step 20: Press the outer edge of the leveling tool against the inner wall of one side of the burner, so that the laser rangefinder forms a first light spot on the opposite water-cooled wall, and measure the first horizontal distance a from the turning point of the water-cooled wall to the first light spot; Step 30: Press the outer edge of the leveling tool against the inner wall of the other side of the burner, so that the laser rangefinder forms a second light spot on the opposite water-cooled wall, and measure the second horizontal distance b from the turning point of the water-cooled wall to the second light spot; Step 40: Calculate the first standard distance e1 and the second standard distance e2 from the intersection point of the nozzle center line of the burner and the water-cooled wall to the turning point of the water-cooled wall according to the design drawing and the error range parameters required for burner positioning; Step 50: When e2 < (a + b) / 2 < e1 is satisfied, the imaginary tangential circle of the burner is qualified.

[0020] The present invention also provides another method for positioning the tangential circle of a boiler burner. The positioning operation is carried out by using the above-mentioned positioning tool for the tangential circle of the boiler burner. The method for positioning the tangential circle of the boiler burner includes the following steps: Step 10, check whether the burner is in a horizontal position by using a level; Step 20, press the outer edge of the leveling tool against the inner wall of one side of the burner, and measure the first distance c from the nozzle section of the burner to the opposite water-cooled wall; Step 30, press the outer edge of the leveling tool against the inner wall of the other side of the burner, and measure the second distance d from the nozzle section of the burner to the opposite water-cooled wall; Step 40, calculate the first standard straight-line distance f1 and the second standard straight-line distance f2 from the nozzle center line of the burner to the opposite water-cooled wall according to the design drawing and the error range parameters required for the burner positioning; Step 50, when f1 < (c + d) / 2 < f2, the imaginary tangential circle of the burner is qualified.

[0021] The beneficial effect of the present invention is that in the embodiments of the present invention, a laser rangefinder is used to measure the straight-line distance and replace the commonly used steel wire in the prior art, which can avoid the problem of positioning deviation caused by the bending deformation of the steel wire due to the action of gravity in the prior art, and achieve the purpose of accurately positioning the imaginary tangential circle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0023] Figure 1 is a schematic structural diagram of the positioning tool for the tangential circle of the boiler burner in the embodiments of the present invention;

[0024] Figure 2 is a schematic diagram of the method for positioning the tangential circle of the boiler burner in the embodiments of the present invention.

[0025] In the figure, reference numerals: 10, laser rangefinder; 20, leveling tool; 30, connecting component; 40, level. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0027] Such as Figure 1As shown in the figure, an embodiment of the present invention provides a tangential circle positioning tool for a boiler burner, which includes a laser rangefinder 10, a leveling tool 20, a connecting component 30, and a spirit level 40. The leveling tool 20 is located on the side of the laser rangefinder 10. The hard and straight outer edge of the leveling tool 20 is parallel to the axial direction of the laser rangefinder 10. The inner edge of the leveling tool 20 is connected to the laser rangefinder 10 through the connecting component 30. The spirit level 40 is fixedly arranged on the laser rangefinder 10 or the leveling tool 20.

[0028] In the embodiment of the present invention, the laser rangefinder 10 is used to measure the straight-line distance and replace the commonly used steel wire in the prior art, which can avoid the problem of positioning deviation caused by the bending deformation of the steel wire due to the action of gravity in the prior art, and achieve the purpose of accurately positioning the imaginary tangential circle.

[0029] In an embodiment of the present invention, a circumferential groove is provided on the outer periphery of the laser rangefinder 10. One end of the connecting component 30 is fixedly connected to the inner edge of the leveling tool 20, and the other end of the connecting component 30 is placed in the circumferential groove. The leveling tool 20 can rotate around the axis of the laser rangefinder 10 together with the connecting component 30.

[0030] The above-mentioned connecting component 30 is a connecting rod. One end of the connecting rod is fixedly connected to the inner edge of the leveling tool 20, and the other end of the connecting rod is a clamping end, which is clamped in the circumferential groove, so that the connecting rod can only rotate along the circumferential groove but cannot swing or come out.

[0031] Preferably, there are two above-mentioned connecting components 30, and two connecting components 30 with the same structure are arranged in parallel at both ends of the leveling tool 20 at intervals. Setting two connecting components 30 can increase the stability of the leveling tool 20 during rotation and avoid the position deflection of the leveling tool 20 during rotation.

[0032] The spirit level 40 is arranged on the leveling tool 20. Among them, the spirit level 40, the outer edge of the leveling tool 20, and the laser beam of the laser rangefinder 10 should be in the same plane, which is used to check whether the burner is in a horizontal position.

[0033] The present invention also provides another embodiment. In this embodiment, one end of the connecting component 30 is fixedly connected to the inner edge of the leveling tool 20, and the other end of the connecting component 30 is fixedly connected to the outer peripheral surface of the laser rangefinder 10. That is, the leveling tool 20 is integrally connected to the laser rangefinder 10 through the connecting component 30.

[0034] Of course, for the convenience of operation by the staff, the leveling tool 20 can be set to two, and the two leveling tools 20 are symmetrically arranged on both sides of the laser rangefinder 10, and each leveling tool 20 is correspondingly connected with a connecting component 30. During work, the two leveling tools 20 can be respectively attached to two opposite side walls of the burner.

[0035] Specifically, each leveling tool 20 is correspondingly connected to two connecting components 30, and the two connecting components 30 are arranged in parallel at both ends of the leveling tool 20 at intervals. The level 40 is arranged on the laser rangefinder 10.

[0036] It should be noted that in the embodiment of the present invention, the outer shape of the laser rangefinder 10 can be a cylinder, a cuboid or a prism. When the outer edge of the leveling tool 20 rotates, it should be ensured that it is always parallel to the laser beam of the laser rangefinder 10. The above-mentioned leveling tool 20 can be a straight ruler, a square ruler or a rectangular ruler. And the above two embodiments are not the only forms of the furnace burner tangential circle positioning tool. As long as the actually used furnace burner tangential circle positioning tool has the above basic functional characteristics, it should be regarded as the furnace burner tangential circle positioning tool proposed by the present invention.

[0037] As Figure 2 shown, the present invention also provides a method for positioning the tangential circle of a boiler burner. Using the above-mentioned boiler burner tangential circle positioning tool for positioning operations, the method for positioning the tangential circle of a boiler burner includes the following steps:

[0038] Step 10: Check whether the burner is in a horizontal position through the level 40;

[0039] Step 20: Press the outer edge of the leveling tool 20 against one inner wall of the burner, so that the laser rangefinder 10 forms a first light spot on the opposite water-cooled wall, and measure the first horizontal distance a from the turning point of the water-cooled wall to the first light spot;

[0040] Step 30: Press the outer edge of the leveling tool 20 against the other inner wall of the burner, so that the laser rangefinder 10 forms a second light spot on the opposite water-cooled wall, and measure the second horizontal distance b from the turning point of the water-cooled wall to the second light spot;

[0041] Step 40: Calculate the first standard distance e1 and the second standard distance e2 from the intersection point of the nozzle center line of the burner and the water-cooled wall to the turning point of the water-cooled wall according to the design drawing and the error range parameters required for burner positioning;

[0042] Step 50: When e2 < (a + b) / 2 < e1, the imaginary tangential circle of the burner is qualified.

[0043] The following is a specific description of each step of this embodiment, specifically as follows:

[0044] Step 10 is specifically: Press the outer edges of the leveling tools 20 of the boiler burner tangential circle positioning tool against the inner walls on both sides of the burner respectively, and check whether the burner is in a horizontal position through the level 40.

[0045] In steps 20 and 30: From the first horizontal distance a and the second horizontal distance b, it can be known that the position at a distance of (a + b) / 2 from the turning point of the water-cooled wall is the intersection point of the burner nozzle center line and the water-cooled wall.

[0046] Step 40 is specifically as follows: According to the design drawings or data, calculate the included angle α between the nozzle center line and the adjacent water-cooled wall. Assume that the included angles between the nozzle center line and the adjacent water-cooled wall are α - Δ and α + Δ, where Δ is the error range required for burner positioning. Calculate the first standard distance e1 and the second standard distance e2 from the intersection point of the corresponding burner nozzle center line and the water-cooled wall to the turning point of the water-cooled wall respectively.

[0047] Furthermore, step 50 is specifically as follows: If e2 < (a + b) / 2 < e1, the imaginary tangent circle of the burner is qualified; otherwise, the angle of the burner nozzle center line must be adjusted to make e2 < (a + b) / 2 < e1.

[0048] It should be noted that in this embodiment, the turning point of the water-cooled wall may not be selected as the reference point to measure the first horizontal distance a and the second horizontal distance b. For example, the midpoint position of the water-cooled wall can be selected for measurement.

[0049] The present invention also provides another embodiment of the positioning method. The method for positioning the tangent circle of the boiler burner specifically includes the following steps:

[0050] Step 10: Check whether the burner is in a horizontal position through the level 40;

[0051] Step 20: Press the outer edge of the leveling tool 20 against the inner wall of one side of the burner, and measure the first distance c from the nozzle cross-section of the burner to the opposite water-cooled wall;

[0052] Step 30: Press the outer edge of the leveling tool 20 against the inner wall of the other side of the burner, and measure the second distance d from the nozzle cross-section of the burner to the opposite water-cooled wall;

[0053] Step 40: Calculate the first standard straight-line distance f1 and the second standard straight-line distance f2 from the nozzle center line of the burner to the opposite water-cooled wall according to the design drawings and the error range parameters required for burner positioning;

[0054] Step 50: When f1 < (c + d) / 2 < f2, the imaginary tangent circle of the burner is qualified.

[0055] The following specifically describes each step of this embodiment as follows:

[0056] Step 10 is specifically as follows: Press the outer edges of the leveling tool 20 of the boiler burner tangent circle positioning tool against the inner walls of both sides of the burner respectively, and check whether the burner is in a horizontal position through the level 40.

[0057] In steps 20 and 30: As can be known from the first distance c and the second distance d, along the direction of the center line of the burner nozzle, the linear distance from the center of the burner nozzle cross-section to the opposite water-cooled wall is (c + d) / 2.

[0058] Step 40 is specifically as follows: According to the design drawings or data, calculate the angle α between the center line of the nozzle and the adjacent water-cooled wall. Assume that the angles between the center line of the nozzle and the adjacent water-cooled wall are α - Δ and α + Δ, where Δ is the error range required for burner positioning. Calculate the first standard linear distance f1 and the second standard linear distance f2 from the intersection point of the center line of the corresponding burner nozzle and the water-cooled wall to the turning point of the water-cooled wall respectively.

[0059] Further, step 50 is specifically as follows: If f1 < (c + d) / 2 < f2, the burner tangential circle is qualified; otherwise, the angle of the center line of the burner nozzle must be adjusted to make f1 < (c + d) / 2 < f2.

[0060] In the embodiments of the present invention, the positioning of the burner tangential circle only involves the measurement of length (or distance). The phase method or pulse method of laser can be directly used for distance measurement, or conventional length measurement tools such as a box ruler and a straight ruler can also be used. The above-mentioned first standard distance e1, second standard distance e2, first standard linear distance f1, and second standard linear distance f2 can all be directly measured and calculated in the drawing software, or calculated through the corresponding calculation formula of angle and length.

[0061] It should be noted that when the present invention is applied to a vertical water-cooled wall, the position of the intersection point of the center line of the burner nozzle and the water-cooled wall can be determined by counting the number of water-cooled wall tubes without relying on length (or distance) measurement tools.

[0062] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: It saves the huge workload of finding the furnace center and placing the tangential circle template, can avoid the positioning error caused by the deformation of the steel wire, and reduces the technical difficulty of finding the center line of the burner nozzle.

[0063] The above are only specific embodiments of the present invention, and the scope of the invention implementation cannot be limited by them. Therefore, the replacement of equivalent components or equivalent changes and modifications made according to the protection scope of the present invention patent should still fall within the scope covered by this patent. In addition, the technical features, technical features and technical solutions, and technical solutions and technical solutions in the present invention can be freely combined and used.

Claims

1. A method for positioning the tangential circle of a boiler burner, characterized in that, a positioning operation is carried out by using a tangential circle positioning tool for a boiler burner, and the tangential circle positioning tool for a boiler burner includes: a laser rangefinder (10); a leveling tool (20), located on the side of the laser rangefinder (10), the straight outer edge of the leveling tool (20) is parallel to the axial direction of the laser rangefinder (10), and the inner edge of the leveling tool (20) is connected to the laser rangefinder (10) through a connecting member (30); a level (40), fixedly arranged on the laser rangefinder (10) or the leveling tool (20); the method for positioning the tangential circle of the boiler burner includes a first method or a second method; when the method for positioning the tangential circle of the boiler burner is the first method, the method for positioning the tangential circle of the boiler burner successively includes the following steps: Step 10a: Check whether the burner is in a horizontal position through the level (40); Step 20a: Press the outer edge of the leveling tool (20) against the inner wall of one side of the burner, so that the laser rangefinder (10) forms a first light spot on the opposite water-cooled wall, and measure the first horizontal distance a from the turning point of the water-cooled wall to the first light spot; Step 30a: Press the outer edge of the leveling tool (20) against the inner wall of the other side of the burner, so that the laser rangefinder (10) forms a second light spot on the opposite water-cooled wall, and measure the second horizontal distance b from the turning point of the water-cooled wall to the second light spot; Step 40a: Calculate the first standard distance e1 and the second standard distance e2 from the intersection point of the nozzle center line of the burner and the water-cooled wall to the turning point of the water-cooled wall according to the error range parameters required by the design drawing and the burner positioning; Step 50a: When e2 < (a + b) / 2 < e1, the imaginary tangential circle of the burner is qualified; the first standard distance e1 and the second standard distance e2 are obtained by direct measurement in the drawing software or by calculating through the corresponding calculation formula of the angle and the length; when the method for positioning the tangential circle of the boiler burner is the second method, the method for positioning the tangential circle of the boiler burner successively includes the following steps: Step 10b: Check whether the burner is in a horizontal position through the level (40); Step 20b: Press the outer edge of the leveling tool (20) against the inner wall of one side of the burner, and measure the first distance c from the nozzle section of the burner to the opposite water-cooled wall; Step 30b: Press the outer edge of the leveling tool (20) against the inner wall of the other side of the burner, and measure the second distance d from the nozzle section of the burner to the opposite water-cooled wall; Step 40b: Calculate the first standard straight-line distance f1 and the second standard straight-line distance f2 from the nozzle center line of the burner to the opposite water-cooled wall according to the error range parameters required by the design drawing and the burner positioning; Step 50b: When f1 < (c + d) / 2 < f2, the imaginary tangential circle of the burner is qualified; the first standard straight-line distance f1 and the second standard straight-line distance f2 are obtained by direct measurement in the drawing software or by calculating through the corresponding calculation formula of the angle and the length.

2. The boiler burner tangential circle positioning method according to claim 1, It is characterized in that A circumferential groove is provided on the outer periphery of the laser rangefinder (10); one end of the connecting component (30) is fixedly connected to the inner edge of the leveling tool (20); the other end of the connecting component (30) is placed in the circumferential groove; and the leveling tool (20) can rotate around the axis of the laser rangefinder (10) together with the connecting component (30).

3. The boiler burner tangential circle positioning method according to claim 2, It is characterized in that There are two connecting components (30), and the two connecting components (30) are arranged in parallel and at intervals at the two ends of the leveling tool (20).

4. The boiler burner tangential circle positioning method according to claim 2, It is characterized in that The level meter (40) is arranged on the leveling tool (20).

5. The boiler burner tangential circle positioning method according to claim 1, It is characterized in that One end of the connecting component (30) is fixedly connected to the inner edge of the leveling tool (20), and the other end of the connecting component (30) is fixedly connected to the outer peripheral surface of the laser rangefinder (10).

6. The boiler burner tangential circle positioning method according to claim 5, It is characterized in that There are two leveling tools (20), which are symmetrically arranged on both sides of the laser rangefinder (10), and each leveling tool (20) is correspondingly connected to a connecting component (30).

7. The boiler burner tangential circle positioning method according to claim 6, It is characterized in that Each leveling tool (20) is correspondingly connected to two connecting components (30), and the two connecting components (30) are arranged in parallel and at intervals at two ends of the leveling tool (20).

8. The boiler burner tangential circle positioning method according to claim 5, It is characterized in that The level (40) is arranged on the laser distance meter (10).

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