Method for repairing deformation of iron phosphate roasting furnace barrel through thermal calibration
Through the thermal calibration repair method of measurement and partition heating, the problem of bending deformation of the cylinder of the drying and calcining equipment due to thermal stress is solved, and efficient and low-cost repair effect is achieved.
Patent Information
- Application Number
- CN202510617664.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-14
- Publication Date
- 2025-08-08
AI Technical Summary
During the high-temperature use, the drying and calcining equipment is subject to external constraints due to thermal stress caused by bending and deformation, which affects the normal operation of the equipment.
By measuring the radial jump value of the roasting furnace cylinder, determining the deformation position, and thermal calibration and repairing are performed using partition heating and intermittent rotation of the furnace cylinder, including temperature partition calibration, lifting and cooling and intermittent rotation until the jump value meets the requirements.
It realizes simple and efficient cylinder deformation repair, saving time and cost, and avoids possible misdetection and over-repair in traditional methods.
Smart Images
Figure CN120444895A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of high-temperature thermal deformation of cylinders, and in particular to a method for thermally calibrating and repairing cylinder deformation of an iron phosphate roasting furnace. Background Art
[0002] During long-term high-temperature operation, the cylinder of drying and roasting equipment expands due to heat. If constrained by external structures or improperly used, this expansion cannot be released freely, inevitably generating thermal stress that causes the cylinder to bend and deform, thus affecting the normal operation of the equipment. To address this problem, a thermal calibration method for repairing cylinder deformation in ferrous phosphate roasting furnaces has been developed. Summary of the Invention
[0003] The purpose of the present invention is to address the above-mentioned problems existing in the high-temperature operation of existing roasting furnaces and to propose a method for thermal calibration to repair the deformation of the iron phosphate roasting furnace cylinder.
[0004] To solve the above problems, the present invention provides a method for thermal calibration to repair the deformation of an iron phosphate roasting furnace cylinder, comprising the following steps: A thermal calibration repair method for a deformed iron phosphate roasting furnace cylinder, the thermal calibration repair method comprising the following steps: (1) Measure the radial runout value of the furnace tail when the roasting furnace is in cold idling state, and mark the first position where the radial runout value of the furnace tail is the maximum and the second position where the radial runout value of the furnace tail is the minimum; (2) Measure the radial runout value of the furnace tail for the second time when the roasting furnace is idling in the heating state, and mark the third position where the maximum radial runout value of the furnace tail is located and the fourth position where the minimum radial runout value of the furnace tail is located after the second measurement; comparing the first position and the third position, and the second position and the fourth position, thereby determining the deformation position in the axial direction; (3) Detect the thermal deformation state of each temperature zone of the furnace drum separately: adjust the temperature of the nth temperature zone to be measured of the furnace drum to make it higher than the temperature of other temperature zones, and then measure the radial runout value of the furnace tail under constant temperature, and mark the nth position where the maximum radial runout of the tail is located and the n'th position where the minimum radial runout of the furnace tail is located; According to the above method, the thermal deformation state of other temperature zones is detected respectively, so as to find the deformation position in the radial direction; the type of deformation is determined by the runout value; (4) Perform heat calibration in different temperature zones: If the deformation is convex, rotate the roasting furnace to the highest point where the convex deformation occurs, increase the temperature of the temperature zone where the convex deformation occurs, and keep the temperature of other zones unchanged. Stop the furnace drum and calibrate the drum. If it is an inward deformation, adjust the inward deformation to the lowest point and calibrate it in a heated state; (5) Continue to keep the furnace temperature in each temperature zone unchanged, and place a dial indicator at the bottom of the supporting wheel at the discharge end, rotate the roasting furnace and observe the change in the runout value. When the runout value becomes within a / 2+2mm, it indicates that the thermal calibration of the position is completed, where a is the maximum runout value; Continue to calibrate all positions that need to be calibrated through steps (4) and (5) until all position deformations are calibrated; (6) Prevent the cylinder from rebounding under high temperature after calibration: start to cool down the temperature of each temperature zone of the roasting furnace in a uniform gradient. During the cooling process, stop the roasting furnace intermittently to cool down and shape. Each time the roasting furnace is stopped, turn the minimum gap at the tail end of the roasting furnace to the bottom, and observe the dial indicator at the bottom to determine whether there is deformation rebound; if there is, calibrate; if there is no rebound, continue to stop the roasting furnace intermittently to cool down and shape; (7) When the temperature of each temperature zone of the roasting furnace drops to the specified temperature, the thermal calibration is completed.
[0005] Furthermore, the furnace tail (2) is divided into 8 parts in the axial direction. When the roasting furnace is in a cold state, the roasting furnace is rotated to measure and mark the maximum and minimum value parts of the runout.
[0006] Furthermore, the specific operation of step (2) is as follows: first, the temperature of all temperature zones of the roasting furnace is increased, and the temperature is continuously increased at 50°C / h. After the temperature of each temperature zone of the roasting furnace is increased to 630°C, the temperature is kept constant for 2 hours. During the constant temperature process, the radial runout value of the tail end of the furnace is measured.
[0007] Furthermore, in step (3), the temperature of the area to be inspected is first raised to 690°C for 1 hour, and then kept constant for 1 hour, while the other temperature zones are kept constant at 630°C. During the constant temperature process, the radial runout value of the furnace tail is measured. After the inspection is completed, the temperature of the area is restored to the same temperature as other areas, and the inspection of the area is completed.
[0008] Furthermore, in step (4), if the deformation is convex, the calciner is rotated to the highest point where the convex deformation occurs, the temperature of the temperature zone to be heat-calibrated is raised to 690°C, the temperature of other zones is maintained at 630°C, and the rotation of the furnace is stopped to calibrate the cylinder; If it is an inward deformation, adjust the inward deformation position to the lowest point and calibrate it in the heating state.
[0009] Furthermore, in step (6), the cooling rate is 60°C / h. During the cooling process, the roasting furnace is stopped for 10 minutes and rotated for 10 minutes, and the operation is repeated. When the furnace is stopped after the rotation is completed, the minimum gap at the tail end of the roasting furnace is still turned to the bottom, and the dial indicator is observed at the bottom.
[0010] The present invention has the following advantages: 1. The present invention adopts a high-temperature thermal calibration method to calibrate the deformation of the roasting furnace, which is simple to operate.
[0011] 2. The present invention adopts the method of temperature rise and fall and intermittent rotation of the furnace drum to perform self-alignment and calibration of furnace drum deformation, which saves time and repair costs compared with traditional calibration technology. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.
[0013] Figure 1 This is a schematic diagram of the roasting furnace (1) of the present invention; Figure 2 It is a cross-sectional schematic diagram of the furnace tail (2) of the present invention. DETAILED DESCRIPTION
[0014] A method for thermally calibrating and repairing a deformed iron phosphate roasting furnace cylinder comprises the following steps: (1) Measure the radial runout value of the furnace tail when the roasting furnace is cold and idling, and then mark the first position where the radial runout value of the furnace tail is the maximum and the second position where the radial runout value of the furnace tail is the minimum.
[0015] Please refer to Figure 1 and 2 , the tail (2) position of the roasting furnace (1) is divided into 8 parts in the axial direction, and when the roasting furnace is cold, the roasting furnace is rotated, and the parts with the maximum and minimum values of the circle are measured and marked.
[0016] In this step, it is generally determined whether the shaft of the supporting roller (3) deviates from the axis, and false detection caused by deviation of the supporting roller shaft is eliminated.
[0017] (2) Measure the radial runout value of the furnace tail for the second time while the roasting furnace is idling in the heating state, and mark the third position where the maximum radial runout value of the furnace tail is located and the fourth position where the minimum radial runout value of the furnace tail is located.
[0018] The specific steps are as follows: First, heat up all temperature zones of the roasting furnace at a rate of 50°C / h. After the temperature of each temperature zone of the roasting furnace is raised to 630°C, keep the temperature constant for 2 hours. During the constant temperature process, measure the radial runout value of the tail end of the furnace.
[0019] By comparing the first position and the third position, as well as the second position and the fourth position, the deformation position in the axial direction is found; this also prevents missed detection of thermal deformation that only occurs in a heated state.
[0020] (3) Measure the thermal deformation state of each temperature zone of the furnace drum (roasting section) separately: In this embodiment, the furnace drum (4) is divided into 6 temperature zones, each of which can be adjusted independently. The thermal deformation state of each temperature zone is detected separately. The measurement method is as follows: First, the temperature of the nth area to be tested is raised to 690℃ for 1 hour, and then kept constant at this temperature for 1 hour. The other temperature areas are kept constant at 630℃. During the constant temperature process, the radial runout value of the furnace tail is measured, and the nth position where the maximum radial runout of the tail is located and the n'th position where the minimum radial runout of the furnace tail is located are marked respectively. After the test is completed, the temperature of this area is restored to the same temperature as other areas, and the test of this area is completed.
[0021] This method is used to measure the radial runout values of the furnace tail of the next temperature zone under constant temperature in turn, and mark the (n+1)th position where the maximum radial runout of the tail is located and the (n+1)'th position where the minimum radial runout of the furnace tail is located; and so on, so as to determine the thermal deformation of each temperature zone under heating state.
[0022] Through step (3), the deformation position is found in the radial direction.
[0023] Through steps (1)-(3), the specific deformation position is finally determined, and the type of deformation, such as convex or concave, is determined by the runout value, and then the deformation is corrected.
[0024] (4) Perform heat calibration in different temperature zones. Rotate the roasting furnace to the highest point where the convex deformation occurs. Raise the temperature of the zone to be heat calibrated to 690°C, while maintaining the temperature of other zones at 630°C. Stop the furnace drum and calibrate the drum. Under the action of gravity and heating, the convex deformation position will undergo reverse deformation. Similarly, adjust the inward deformation position to the lowest point, and reverse deformation will occur in this part under heating.
[0025] (5) Continue to keep the furnace temperature in each temperature zone unchanged, and place a dial indicator at the bottom of the supporting wheel at the discharge end, rotate the roasting furnace and observe the change in the runout value. When the runout value becomes within a / 2+2mm, it indicates that the thermal calibration of this position is completed.
[0026] Where a is the maximum value of the jump.
[0027] After completing the thermal calibration of one position through steps (4) and (5), proceed to the next position until the deformation calibration of all positions is completed.
[0028] In the steps (4) and (5), the runout deviation of the cylinder is adjusted by heating the cylinder to allow the heated section of the cylinder to achieve reverse deformation.
[0029] (6) Prevent the cylinder from rebounding under high temperature after calibration; each temperature zone of the roasting furnace begins to cool down uniformly. In this embodiment, the cooling rate is 60°C / h. During the cooling process, the roasting furnace is stopped for 10 minutes and rotated for 10 minutes (to prevent the cylinder from rebounding after calibration, the roasting furnace is stopped intermittently to cool down and shape it). The operation is repeated. When the furnace is stopped after the rotation is completed, the minimum gap at the tail end of the roasting furnace is still turned to the bottom. At the same time, the dial indicator on the bottom rack is observed to determine whether there is deformation rebound. If so, the calibration step is continued.
[0030] (7) When the temperature in each temperature zone of the roasting furnace drops to 60℃, the thermal calibration is completed.
Claims
1. A thermal calibration repair method for a deformed iron phosphate roasting furnace cylinder, characterized in that: The thermal calibration repair method comprises the following steps: (1) Measure the radial runout value of the furnace tail when the roasting furnace is in cold idling state, and mark the first position where the radial runout value of the furnace tail is the maximum and the second position where the radial runout value of the furnace tail is the minimum; (2) Measure the radial runout value of the furnace tail for the second time when the roasting furnace is idling in the heating state, and mark the third position where the maximum radial runout value of the furnace tail is located and the fourth position where the minimum radial runout value of the furnace tail is located after the second measurement; comparing the first position and the third position, and the second position and the fourth position, thereby determining the deformation position in the axial direction; (3) Detect the thermal deformation state of each temperature zone of the furnace drum separately: adjust the temperature of the nth temperature zone to be measured of the furnace drum to make it higher than the temperature of other temperature zones, and then measure the radial runout value of the furnace tail under constant temperature, and mark the nth position where the maximum radial runout of the tail is located and the n'th position where the minimum radial runout of the furnace tail is located; According to the above method, the thermal deformation state of other temperature zones is detected respectively, so as to find the deformation position in the radial direction; the type of deformation is determined by the runout value; (4) Perform heat calibration in different temperature zones: If the deformation is convex, rotate the roasting furnace to the highest point where the convex deformation occurs, increase the temperature of the temperature zone where the convex deformation occurs, and keep the temperature of other zones unchanged. Stop the furnace drum and calibrate the drum. If it is an inward deformation, adjust the inward deformation to the lowest point and calibrate it in a heated state; (5) Continue to keep the furnace temperature in each temperature zone unchanged, and place a dial indicator at the bottom of the supporting wheel at the discharge end, rotate the roasting furnace and observe the change in the runout value. When the runout value becomes within a / 2+2mm, it indicates that the thermal calibration of the position is completed, where a is the maximum runout value; Continue to calibrate all positions that need to be calibrated through steps (4) and (5) until all position deformations are calibrated; (6) Prevent the cylinder from rebounding under high temperature after calibration: start to cool down the temperature of each temperature zone of the roasting furnace in a uniform gradient. During the cooling process, stop the roasting furnace intermittently to cool down and shape. Each time the roasting furnace is stopped, turn the minimum gap at the tail end of the roasting furnace to the bottom, and observe the dial indicator at the bottom to determine whether there is deformation rebound; if there is, calibrate; if there is no rebound, continue to stop the roasting furnace intermittently to cool down and shape; (7) When the temperature of each temperature zone of the roasting furnace drops to the specified temperature, the thermal calibration is completed.
2. The thermal calibration repair method for a deformed iron phosphate roasting furnace cylinder according to claim 1, characterized in that: The furnace tail (2) is divided into 8 parts in the axial direction. When the roasting furnace is in a cold state, the roasting furnace is rotated and the parts with the maximum and minimum values of the runout are measured and marked.
3. The thermal calibration repair method for a deformed iron phosphate roasting furnace shell according to claim 1, characterized in that: The specific operation of step (2) is as follows: first, heat up all temperature zones of the roasting furnace at a rate of 50°C / h. After the temperature of each temperature zone of the roasting furnace is raised to 630°C, the temperature is kept constant for 2 hours. During the constant temperature process, the radial runout value of the tail end of the furnace is measured.
4. The thermal calibration repair method for a deformed iron phosphate roasting furnace shell according to claim 1, characterized in that: In step (3), the temperature of the area to be tested is first raised to 690°C for 1 hour, and then kept constant for 1 hour. The other temperature zones are kept constant at 630°C. The radial runout value of the furnace tail is measured during the constant temperature process. After the test is completed, the temperature of the area is restored to the same temperature as other areas, and the test of the area is completed.
5. The thermal calibration repair method for a deformed iron phosphate roasting furnace shell according to claim 1, characterized in that: In step (4), if it is a convex deformation, the convex deformation position of the rotating roasting furnace is rotated to the highest point, the temperature of the temperature zone to be heat-calibrated is raised to 690°C, the temperature of other zones is maintained at 630°C, and the rotation of the furnace drum is stopped to calibrate the drum; If it is an inward deformation, adjust the inward deformation position to the lowest point and calibrate it in the heating state.
6. The thermal calibration repair method for a deformed iron phosphate roasting furnace shell according to claim 1, characterized in that: In step (6), the cooling rate is 60°C / h. During the cooling process, the roasting furnace is stopped for 10 minutes and rotated for 10 minutes, and the operation is repeated. When the furnace is stopped after the rotation is completed, the minimum gap at the tail end of the roasting furnace is still turned to the bottom, and the dial indicator is observed at the bottom.
Citation Information
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