CN116855661A - Method for detecting erosion state of blast furnace hearth - Google Patents
Method for detecting erosion state of blast furnace hearth Download PDFInfo
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- CN116855661A CN116855661A CN202310601799.9A CN202310601799A CN116855661A CN 116855661 A CN116855661 A CN 116855661A CN 202310601799 A CN202310601799 A CN 202310601799A CN 116855661 A CN116855661 A CN 116855661A
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- 230000003628 erosive effect Effects 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000007787 solid Substances 0.000 claims abstract description 25
- 239000011449 brick Substances 0.000 claims description 63
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 60
- 229910052799 carbon Inorganic materials 0.000 claims description 60
- 238000005259 measurement Methods 0.000 claims description 20
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- 230000008569 process Effects 0.000 claims description 7
- 239000000725 suspension Substances 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 5
- 239000012770 industrial material Substances 0.000 claims description 5
- 238000005553 drilling Methods 0.000 claims description 4
- 229910052602 gypsum Inorganic materials 0.000 claims description 3
- 239000010440 gypsum Substances 0.000 claims description 3
- 239000012778 molding material Substances 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 10
- 230000006872 improvement Effects 0.000 description 10
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- 238000005266 casting Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000000919 ceramic Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013499 data model Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/24—Test rods or other checking devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2300/00—Process aspects
- C21B2300/04—Modeling of the process, e.g. for control purposes; CII
Abstract
The invention discloses a method for detecting the erosion state of a blast furnace hearth, belonging to the field of blast furnace ironmaking. It comprises the following steps: 1. obtaining an eroded hearth cavity; 2. obtaining an eroded hearth cavity solid model; 3. and (5) measuring the entity model of the eroded hearth cavity. The invention can solve the shutdown problem caused by erosion detection of the blast furnace hearth during blast furnace overhaul, completes the establishment of an erosion model on the premise of not influencing the blast furnace overhaul, and avoids the potential safety hazard during the erosion detection of the hearth.
Description
Technical Field
The invention belongs to the field of blast furnace ironmaking, and particularly relates to a method for detecting a blast furnace hearth erosion state.
Background
After the blast furnace is smelted for a certain period, refractory materials of the hearth, such as carbon bricks, corundum mullite ceramic pads and the like, are corroded by molten iron circulation, are thinned gradually, and when the measured thickness locally reaches within 500mm, the blast furnace is forced to stop for hearth re-building or pouring repair. During the shutdown period, a blast furnace smelter often carries out damage investigation on the erosion state of the hearth so as to grasp the internal law of erosion and guide improvement on subsequent hearth design, repair and later hearth maintenance operation, and establishing a blast furnace hearth erosion model is one of important means for investigating and grasping the erosion law of the blast furnace hearth.
Blast furnace hearth erosion models, described in classical textbooks as "garlic-bulb-type" or "foot-like", have emerged in a wide variety of online erosion thickness model software with the development of modern electronics, such as online detection models based on neuron, temperature field, heat transfer mass transfer heat radiation principles, and simulation calculations in combination with software such as flow, ansys, etc. However, in particular to the erosion situation of the hearth erosion entity, the physical measurement of the corroded carbon bricks of the hearth is required when the blast furnace is replaced or completely overhauled, or the corroded state of the hearth is required when the blast furnace is overhauled.
The real measurement of the corroded carbon bricks of the hearth is a complex, hard and even dangerous work. Because blast furnace overhaul is multi-species continuous and coordinated operation, the unit responsible for furnace disassembly operation and the unit responsible for measurement research are often not the same unit, but the unit responsible for furnace disassembly operation is 24-hour continuous operation, complete shutdown and work of the unit responsible for measurement research cannot be matched, and because three-dimensional operation and multi-mechanical operation are more related to the risk factors of the falling objects at high altitude during the process of furnace disassembly, real-object measurement of the corroded carbon bricks of the hearth in the past is often in a hurry, incomplete and incomplete partial or partial measurement, and the measurement model is mostly partial data or rough or partial description or speculation model.
The Chinese patent application number is: CN201711362543.8, publication date: patent literature of 2019, 6 and 25 days discloses a method for detecting erosion conditions of a blast furnace hearth, which takes a heat transfer coefficient of a furnace wall carbon brick and a heat exchange coefficient of a furnace wall and a cooling system as optimization variables, takes the sum of the calculated temperature of a temperature measuring point in the furnace wall and the actual measured temperature of a thermocouple as a minimum target, comprehensively utilizes thermocouple temperature measurement data, and optimizes an objective function by a solid heat transfer calculation model and a nonlinear optimization method. And simultaneously obtaining the heat transfer coefficient of the furnace wall carbon bricks and the heat exchange coefficient of the furnace wall and the cooling system, further calculating the heat exchange rate of the cooling units at different positions, and evaluating the heat transfer efficiency of each cooling plate. By calculating and analyzing a series of historical temperature measurement data of the thermocouple, the erosion condition of the hearth and the actual operation furnace type in different periods can be obtained. By detecting the heat transfer effect of the cooling units at different positions, operators can repair the low-efficiency cooling units in time.
The Chinese patent application number is: CN201910682597.5, publication date: patent literature of 2019, 12 and 24 discloses a method and a device for measuring erosion state of a hearth, wherein a three-dimensional scanner is used for scanning the hearth of a blast furnace to obtain scanning data; carrying out data processing on the scanning data to obtain a three-dimensional model of the blast furnace; according to the original design data of the blast furnace, an original three-dimensional model of the blast furnace is obtained; centering and combining the three-dimensional model of the blast furnace and the original three-dimensional model of the blast furnace to obtain a three-dimensional model of blast furnace erosion; and cutting the cross section of the three-dimensional model of the blast furnace erosion to obtain the erosion state of the hearth.
The erosion state of the blast furnace hearth can be detected by the two schemes, but the erosion state and the erosion state of the blast furnace hearth are detected directly, when a similar scheme is adopted under the condition of blast furnace overhaul, the blast furnace overhaul is stopped, and the blast furnace overhaul is waited to work after the detection is finished, so that the blast furnace overhaul is influenced, and meanwhile, the blast furnace hearth is detected when the blast furnace overhaul is finished, so that a certain potential safety hazard exists.
Disclosure of Invention
1. Problems to be solved
Aiming at the problem that the existing blast furnace hearth erosion state detection method is difficult to be suitable for detecting the hearth erosion state during blast furnace overhaul, the invention provides the blast furnace hearth erosion state detection method, which can solve the shutdown problem caused by erosion detection of the blast furnace hearth during blast furnace overhaul, complete the establishment of an erosion model on the premise of not influencing the blast furnace overhaul, and avoid the potential safety hazard during the blast furnace erosion detection.
2. Technical proposal
In order to solve the problems, the invention adopts the following technical scheme.
A method for detecting the erosion state of a blast furnace hearth comprises the following steps:
1. acquisition of eroded hearth cavity
Numbering corroded carbon bricks of a hearth to be detected according to a position sequence, then dismantling the hearth to be detected, completely transferring the numbered corroded carbon bricks to a designated position, orderly placing according to the numbering sequence, and then laying back the corroded carbon bricks according to the recorded numbering sequence to obtain a corroded hearth cavity;
2. acquisition of eroded hearth cavity solid model
Placing a tubular industrial template with a polygonal normal section in the eroded hearth cavity, forming a cavity between the tubular industrial template and the bottom surface and the side surface of the eroded hearth cavity, injecting castable industrial materials into the cavity, and dismantling all carbon bricks and the tubular industrial template after solidification to obtain a solid model;
3. measurement of eroded hearth cavity solid model
And measuring the solid model by a laser measuring device, and inputting measured data into a computer to obtain a hearth erosion model.
As a further improvement of the technical scheme, in the third step, the specific measuring process is as follows:
placing the solid model on a horizontal reference plane, and arranging an annular track on the periphery of the solid model; a rotatable measuring vertical rod is arranged in the center of the solid model, and a measuring cross beam, a first laser target plate, an angle rotation recorder and an angle rotation motor are arranged at the upper part of the measuring vertical rod, and the angle rotation motor drives the measuring vertical rod to rotate; one end of the measuring beam is connected with the measuring vertical rod, the other end of the measuring beam is connected with the upper part of the auxiliary vertical rod, the lower part of the auxiliary vertical rod is provided with universal wheels, and the universal wheels are arranged on the annular track;
the horizontal laser distance measuring instrument is arranged on the measuring beam in a sliding manner and can be controlled to move along the measuring beam through the transverse driving device, and the vertical downward laser distance measuring instrument and the suspension measuring rod are arranged on the horizontal laser distance measuring instrument; the rotary laser range finder is slidably arranged on the suspension measuring rod, can be controlled to move along the suspension measuring rod through the vertical driving device, controls the laser emission angle through the angle adjusting device, and is provided with a second laser target board;
during measurement, the angle rotating motor is controlled to rotate by a certain angle alpha, and the horizontal laser range finder is aligned with the first laser target plate to measure the distance L 1 The distance H is measured by aligning the vertical downward laser range finder with the second laser target plate 1 The rotary laser range finder is adjusted to a vertical angle to measure the distance from the reference planeH 2 Adjusting to a horizontal angle to measure the distance L of the outer surface of the solid model under the angle 2 ；
The erosion amount of the hearth carbon bricks is as follows: delta=l 1 －L 2 －R 0 Wherein R is 0 The design radius of the hearth is set;
and (3) adjusting the rotation angle of the angle rotating motor, the position of the horizontal laser range finder in the horizontal direction and the position of the rotating laser range finder in the height direction to obtain the erosion amount of the hearth carbon bricks under different angles and different heights.
As a further improvement of the technical scheme, the inner diameter of the annular track is less than or equal to 2 times of the designed inner diameter of the hearth.
As a further improvement of the technical solution, the design height of the hearth is measured with a height >1 times the height of the cross beam.
As a further improvement of the technical scheme, the device further comprises a control processor, wherein the control processor is electrically connected with each measuring device and each driving device in the third step.
As a further improvement of the technical scheme, in the first step, the concrete process of removing and transferring the eroded carbon bricks is as follows: drilling a drilling hole on the surface of the eroded carbon brick, installing a vertical hoisting bolt and a lateral hoisting bolt, controlling a dismantling and rotating winch, and completing the hoisting action to loosen the eroded carbon brick through the connection of a lifting hook and the vertical hoisting bolt; then, connecting the carbon bricks with side hoisting bolts through a lifting hook, and horizontally dragging the corroded carbon bricks to a lifting belt conveyor; the lifting belt conveyor transfers the corroded carbon bricks to the horizontal belt conveyor, the horizontal belt conveyor transfers the corroded carbon bricks to the appointed position, and then the corroded carbon bricks are laid back through the bricklaying winch.
As a further improvement of the technical scheme, the four horizontal belt conveyors are in end-to-end cyclic operation.
As a further improvement of the technical scheme, the method further comprises the following step four: and scanning the corroded hearth cavity by adopting a 3D laser scanner to obtain a stereoscopic image model, then adopting computer-aided software to obtain a horizontal or vertical section of the corroded hearth, and measuring and arranging the horizontal or vertical section by a computer to obtain a hearth corrosion model.
As a further improvement of the technical scheme, the fourth step further includes: and (3) comparing the data obtained in the step four with the hearth erosion model and comparing the data obtained in the step three with the hearth erosion model.
As a further improvement of the technical scheme, in the second step, the industrial material is gypsum or resin or castable molding material.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention relates to a method for detecting the erosion state of a blast furnace hearth, which combines the technique of the whole translation of a large repair hearth of the blast furnace, designs the whole translation technique of the hearth, utilizes combination equipment such as a winch, a hydraulic lifting and a horizontal belt conveyor and the like to carry out near disassembly and movement on carbon bricks of the eroded hearth, then carries out back-building reduction on the disassembled carbon bricks of the eroded hearth according to the number and the direction to form a cavity body of the eroded hearth, adopts a tube-like body casting mould to the cavity body to obtain a tube-like body solid model of the eroded hearth, and can establish the hearth erosion model in a transfer-back building mode after disassembly, thus the disassembly belongs to normal operation of blast furnace overhaul, and the excessive influence on the blast furnace overhaul operation is avoided, and the potential safety hazard during routine detection is avoided;
(2) According to the method for detecting the erosion state of the blast furnace hearth, disclosed by the invention, a horizontal or vertical or rotary laser range finder is adopted to obtain the distance from any point on the outer surface of the physical model to the axis of the hearth and a horizontal reference surface, so that the erosion amount of the hearth carbon bricks at any position is obtained, and a hearth erosion data model is obtained through calculation and arrangement, so that the obtained hearth erosion data is comprehensive, and the finally established hearth erosion model is more accurate;
(3) According to the method for detecting the erosion state of the blast furnace hearth, after the eroded carbon bricks are built back to obtain the eroded hearth cavity, a three-dimensional image of the eroded hearth cavity can be obtained through 1-time 3D laser scanning, a horizontal or vertical section of the eroded hearth is obtained along the height or angle of the axis of the hearth by adopting computer aided design software, the horizontal or vertical section is measured and arranged in a computer to obtain a hearth erosion model, the hearth erosion model can be mutually verified with a tube-like body casting die, and finally, a more complete and accurate hearth erosion model is obtained, so that reliable design basis and guidance are provided for the design selection of materials and the production process operation of the blast furnace hearth.
Drawings
FIG. 1 is a schematic illustration of a process for demolishing and laying back an eroded carbon brick;
FIG. 2 is a schematic view of an eroded hearth and cavity of a blast furnace;
FIG. 3 is a physical model of an eroded hearth cavity-like tube;
FIG. 4 is a schematic illustration of a 3D laser scanner measurement;
FIG. 5 is a schematic diagram of the measurement of a physical model of an eroded hearth cavity-like tube;
in the figure: 1. a bottom surface; 2. is eroded by all carbon bricks; 3. an upper edge contour line; 4. a polygon; 5. tubular industrial templates; 6. a lower edge contour line; 7. a side surface; 8. corroded carbon bricks; 9. vertically hoisting a bolt; 10. a bolt is hoisted on the side surface; 11. a motor controller; 12. a motor; 13. a winding drum; 14. a lifting hook; 15. a fixed pulley I; 16. a fixed pulley II; 19. a fixed pulley III; 20. a wire brush; 21. lifting the belt pulley; 22. lifting a belt tail pulley; 23. lifting the belt; 24. a first pull rod; 25. a hydraulic pull rod; 26. a second pull rod; 27. a belt conveyor wheel; 28. a hydraulic cylinder; 29. a hydraulic controller; 30. a tensioning wheel bracket; 31. a tensioning wheel bracket chute; 32. a movable tensioner; 33. a tensioning wheel bracket beam; 34. fixing a tensioning wheel; 35. a belt horizontal bracket; 36. a belt tail pulley bracket; 37. a third pull rod; 38. a horizontal belt I; 39. a horizontal belt II; 40. a horizontal belt III; 41. a horizontal belt IV; 42. the carbon bricks are to be laid back; 43. a bricklaying winch; 44. a horizontal plane; 45. a horizontal reference surface; 46. an endless track; 47. a universal wheel; 48. an auxiliary vertical rod; 49. rotating the laser range finder; 50. a second laser target plate; 51. suspending a measuring rod; 52. a first conducting wire; 53. a control processor; 54. a second conducting wire; 55. a third conducting wire; 56. a fourth wire; 57. a fixing bolt; 58. measuring a cross beam; 59. a translation motor; 60. a horizontal connector; 61. a fixing member; 62. an angle rotating motor; 63. an angle rotation recorder; 64. a first laser target plate; 65. a bearing; 66. measuring a vertical rod; 67. measuring a vertical rod base; 68. a rotating bearing; 69. a solid model; 70. an eroded hearth cavity; 71. a 3D laser scanner; 72. a rotating electric machine; 74. hoisting the cantilever; 75. a brick disassembly winch; 76. lifting the belt conveyor; 78. a horizontal laser range finder; 79. a vertically downward laser rangefinder; 81. an upper and lower connecting member; 82. an up-and-down motion motor; 83. and rotating the connecting piece.
Detailed Description
Exemplary embodiments of the present invention are described in detail below. While these exemplary embodiments are described in sufficient detail to enable those skilled in the art to practice the invention, it is to be understood that other embodiments may be realized and that various changes to the invention may be made without departing from the spirit and scope of the invention. The following more detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is merely illustrative and not limiting of the invention's features and characteristics in order to set forth the best mode of carrying out the invention and to sufficiently enable those skilled in the art to practice the invention. Accordingly, the scope of the invention is limited only by the attached claims.
Examples
As shown in fig. 1 to 5, a method for detecting a blast furnace hearth erosion state includes the steps of:
1. acquisition of eroded hearth cavity 70
Numbering corroded carbon bricks 8 of a hearth to be detected according to a position sequence by combining a blast furnace large repair hearth integral translation technology process, then dismantling the hearth to be detected, integrally transferring the numbered corroded carbon bricks 8 to a designated position, orderly placing according to the numbering sequence, and then carrying out back-building on the corroded carbon bricks 8 according to the recorded numbering sequence to obtain a corroded hearth cavity 70;
specifically, for a single hearth block of eroded carbon brick 8, drill holes 80 on the vertical and horizontal sides of the carbon brick were obtained with impact drills, and vertical and side lifting bolts 9 and 10 were installed, respectively. The diameter of the hoisting bolt is more than or equal to 20mm, the length of the hoisting bolt is more than or equal to 100mm, and the load is more than or equal to 200kg.
The height of the hydraulic lifting belt 76 is adjusted to below the eroded carbon bricks 8 of the single hearth, which is known to those skilled in the art, and thus the specific connection structure and operation principle thereof will not be described in detail, but will be described only briefly for convenience of understanding. The hydraulic lifter is operated as follows: the horizontal movement mode is that the belt pulley 27 is pushed by external force on the ground and is fixed by a belt tail pulley bracket 36.
The hydraulic controller 29 controls the hydraulic cylinder 28 and the hydraulic pull rod 25 to stretch and retract, and adjusts a link mechanism consisting of a belt horizontal bracket 35, a pull rod I24, a pull rod II 26 and a pull rod III 37, so as to control the lifting height of the belt conveyor. One end of the first pull rod 24 and one end of the second pull rod 26 are connected and fixed on the hydraulic pull rod 25, and can rotate. The other end of the second pull rod 26 and one end of the third pull rod 37 are fixed on the lifting belt head wheel 21 and can rotate. The other end of the third pull rod 37 is fixed to one end of the belt horizontal bracket 35 and can rotate. The other end of the belt horizontal bracket 35 is connected with the other end of the first pull rod 24 and can rotate.
The lifting belt 23 forms a closed loop through the lifting belt head pulley 21, the movable tensioning pulley 32, the fixed tensioning pulley 34 and the lifting belt tail pulley (22). The fixed tensioning wheel 34 is fixed at the upper end of the tensioning wheel support 30, and the movable tensioning wheel 32 and the tensioning wheel support beam 33 can slide up and down along the tensioning wheel support sliding groove 31 along with the expansion and contraction of the hydraulic pull rod 25, so that the height adjustment of the lifting belt conveyor 76 is completed.
Similarly, the hoist is well known to those skilled in the art, and thus, a specific connection structure and operation principle thereof will not be described in detail, but only briefly described herein for convenience of understanding. The brick disassembly winch 75 is connected with the vertical hoisting bolt 9 through a lifting hook 14, and the vertical hoisting action is completed by the motor controller 11, the motor 12 through the steel wire rope 20, the over-hoisting cantilever 74, the fixed pulley 15, the fixed pulley 16 and the winch drum 13. When the corroded carbon brick 8 is loosened, the corroded carbon brick 8 is connected with the hoisting bolt 10 through the lifting hook 14, passes through the fixed pulley 19 and the hoisting drum 13 through the steel wire rope 20, and is controlled by the motor controller 11 to complete horizontal dragging action through the motor 12, so that the corroded carbon brick 8 is approximately and nondestructively dragged to the hydraulic lifting belt conveyor 76 through the mode of firstly vertical loosening and then horizontal dragging.
The hydraulic lifting belt conveyor 76 transfers the corroded carbon bricks 8 of the single hearth to the horizontal belt I38 or the horizontal belt II 39, the horizontal belt III 40 or the horizontal belt 41, and then transfers the corroded carbon bricks to the designated direction by number to be placed in order for standby, so as to form the carbon bricks 42 to be rebuilt as shown in fig. 1.
Next, the brickwork hoist 43 placed on the horizontal surface 44 is started, and the corroded carbon bricks 2 of all the hearth are laid back to obtain the corroded hearth cavity 70.
In fig. 1, the horizontal belt and the carbon brick 42 to be laid back are seen from the top, the rest are seen from the front, and fig. 1 is only schematically shown.
2. 3D laser scanning
The 3D laser scanner 71 with a single frame larger than or equal to 400 ten thousand pixels and 1920 x 1920 pixels is adopted for scanning the corroded hearth cavity 70, the placing direction of the scanner is horizontal inwards or vertical downwards of the working end, and the included angle beta=0-90 degrees, so that the method only needs to scan once and does not need more than 2 splicing steps. The 3D laser scanning is adopted to obtain a three-dimensional image model of the eroded hearth cavity, computer aided design software is adopted to obtain height or angle data along the axis of the hearth, further horizontal or vertical section data of the eroded hearth are obtained, and the horizontal or vertical section data are measured and arranged in a computer to obtain a hearth erosion model.
3. Acquisition of eroded hearth cavity solid model 69
A tubular industrial template 5 with a polygonal right section 4 is placed in the eroded hearth cavity 70, a cavity is formed between the tubular industrial template 5 and the bottom surface 1 and the side surface 7 of the eroded hearth cavity 70, the cavity is provided with an upper edge contour line 3 and a lower edge contour line 6, castable industrial materials such as gypsum or resin or castable molding materials are poured, and all the eroded carbon bricks 2 and the tubular industrial template 5 are removed after the castable materials are solidified, so that a solid model 69 is obtained.
4. Measurement and calculation of eroded hearth cavity tube-like body phantom 69
The measurement and calculation of the eroded hearth cavity-like tube phantom 69 is performed on the horizontal reference plane 45. In a specific position, a solid model 69 is placed on the horizontal reference surface 45, and an annular track 46 is arranged in the peripheral circumferential direction of the solid model, wherein the inner diameter of the annular track 46 is less than or equal to 2 times the designed inner diameter of the hearth. The center of the solid model 69 is provided with a measuring vertical rod 66, the lower part of the measuring vertical rod 66 is connected with a rotating bearing 68, the rotating bearing 68 is fixed with a measuring vertical rod base 67, the measuring vertical rod base 67 is fixed with the horizontal reference surface 45, and the height of the measuring vertical rod base 67 is more than 1 time of the design height of the hearth.
The upper part of the measuring vertical rod 66 is provided with a measuring beam 58, a laser circular target plate 64, an angle rotation recorder 63 and an angle rotation motor 62 in sequence.
One end of the measuring beam 58 is connected with the measuring vertical rod 66 through a bearing 65, the other end is connected with the upper part of the auxiliary vertical rod 48 and is fixed by a fixing bolt 57, and the distance between the measuring vertical rod 66 and the auxiliary vertical rod 48 is less than or equal to 2 times of the designed inner radius of the hearth. The lower part of the auxiliary vertical rod 48 is connected with a universal wheel 47, the universal wheel 47 can rotate around the measuring vertical rod 66 along the annular track 46 under the drive of the angle rotating motor 62,
the measuring beam 58 is slidably provided with a horizontal laser distance meter 78 and a vertical downward laser distance meter 79, and the horizontal laser distance meter 78 is connected with the translation motor 59 through a horizontal connecting piece 60 so that the translation motor 59 controls the translation motor to move along the measuring beam 58. One end of the vertical downward laser rangefinder 79 is connected with the horizontal laser rangefinder 78, the other end is connected with one end of the overhang measuring rod 51, the three are fixed simultaneously through the fixing piece 61, and the 0 position of the horizontal laser rangefinder 78 and the 0 position of the vertical downward laser rangefinder 79 are adjusted to be the same.
The rotary laser distance meter 49 is slidably mounted on the other end of the overhang measuring rod 51, the rotary laser distance meter 49 is provided with a rotary motor 72, an up-down motion motor 82 and a second laser target plate 50, and the up-down motion motor 82 and the rotary motor 72 are respectively in transmission connection with the rotary laser distance meter 49 through an up-down connecting piece 81 and a rotary connecting piece 83.
The angle rotation motor 62 and the angle rotation recorder 63 are connected to the control processor 53 through a fourth wire 56. The translation motor 59 and the horizontal laser range finder 78 are connected with the control processor 53 through a third lead 55. The vertical down laser rangefinder 79 is connected to the control processor 53 by a second lead 54. The up-down movement motor 82, the rotation motor 72, and the rotation laser range finder 49 are connected to the control processor 53 through a first wire 52.
During measurement, the control processor 53 receives and records all laser rangefinder data signals and provides all instrument and motor power and action instructions.
During measurement, the angle rotating motor 62 is controlled to rotate by a certain angle alpha, and the horizontal laser range finder 78 is aligned with the first laser target plate 64 to measure the distance L 1 The vertical downward laser rangefinder 79 is aligned with the second laser target plate 50 to measure the distance H 1 The rotary laser rangefinder 49 is adjusted to a vertical angle to measure the distance H to the reference plane 45 2 Adjusting to a horizontal angle to measure the distance L of the outer surface of the solid model 69 under the angle 2 。
The erosion amount of the hearth carbon bricks is as follows: delta=l 1 －L 2 －R 0 Wherein R is 0 The design radius of the hearth is equal to the actual hearth masonry radius.
The rotation angle of the angle rotation motor 62, the position of the horizontal laser rangefinder 78 in the horizontal direction, and the position of the rotary laser rangefinder 49 in the height direction are adjusted to obtain erosion amounts of the hearth carbon bricks at different angles and different heights, and are input into a computer to obtain a hearth erosion model.
In summary, the method for detecting the erosion state of the blast furnace hearth of the embodiment designs a hearth integral translation technology, utilizes combined equipment such as a winch, a hydraulic lifting device, a horizontal belt conveyor and the like to carry out near disassembly and movement on the eroded hearth carbon bricks, then carries out back-building reduction on the disassembled and moved hearth carbon bricks into eroded hearth cavity bodies according to numbers and directions, adopts tube-like body casting and molding to the cavity bodies to obtain an eroded hearth cavity-like body entity model, and can establish the hearth erosion model in a transfer-back building manner after disassembly, so that the disassembly belongs to normal operation of blast furnace overhaul, excessive influence is not caused on the blast furnace overhaul operation, and meanwhile, the potential safety hazard in conventional detection is avoided.
In addition, a three-dimensional image of the corroded hearth cavity is obtained through 1-time 3D laser scanning, a horizontal or vertical section of the corroded hearth is obtained along the height or angle of the hearth axis by adopting computer-aided design software, the horizontal or vertical section is measured and arranged in a computer, a hearth corrosion model is obtained, the hearth corrosion model can be mutually verified with a tube-like body pouring die, and finally a more complete and accurate hearth corrosion model is obtained, so that reliable design basis and guidance are provided for blast furnace hearth design selection materials and production process operation.
The examples of the present invention are merely for describing the preferred embodiments of the present invention, and are not intended to limit the spirit and scope of the present invention, and those skilled in the art should make various changes and modifications to the technical solution of the present invention without departing from the spirit of the present invention.
Claims (10)
1. A method for detecting the erosion state of a blast furnace hearth is characterized by comprising the following steps: the method comprises the following steps:
1. acquisition of eroded hearth cavity
Numbering corroded carbon bricks (8) of a hearth to be detected according to a position sequence, then dismantling the hearth to be detected, integrally transferring the numbered corroded carbon bricks (8) to a designated position, orderly placing according to the numbering sequence, and then carrying out back-building on the corroded carbon bricks (8) according to the recorded numbering sequence to obtain a corroded hearth cavity (70);
2. acquisition of eroded hearth cavity solid model
Placing a tubular industrial template (5) with a polygonal right section (4) in the eroded hearth cavity (70), forming a cavity between the tubular industrial template (5) and the bottom surface (1) and the side surface (7) of the eroded hearth cavity (70), injecting castable industrial materials into the cavity, and dismantling all the eroded carbon bricks (2) and the tubular industrial template (5) after solidification to obtain a solid model (69);
3. measurement of eroded hearth cavity solid model
The solid model (69) is measured by a laser measuring device, and measured data is input into a computer to obtain a hearth erosion model.
2. The method for detecting the erosion state of the hearth of a blast furnace according to claim 1, wherein: in the third step, the specific measuring process is as follows:
placing the solid model (69) on a horizontal reference surface (45), and arranging an annular track (46) on the periphery of the solid model; a rotatable measurement vertical rod (66) is arranged in the center of the solid model (69), a measurement cross beam (58), a first laser target plate (64), an angle rotation recorder (63) and an angle rotation motor (62) are arranged on the upper part of the measurement vertical rod (66), and the angle rotation motor (62) drives the measurement vertical rod (66) to rotate; one end of the measuring beam (58) is connected with the measuring vertical rod (66), the other end is connected with the upper part of the auxiliary vertical rod (48), the lower part of the auxiliary vertical rod (48) is provided with a universal wheel (47), and the universal wheel (47) is arranged on the annular track (46);
a horizontal laser distance meter (78) is slidably arranged on the measuring beam (58), and can be controlled to move along the measuring beam (58) through a transverse driving device, and a vertical downward laser distance meter (79) and a suspension measuring rod (51) are arranged on the horizontal laser distance meter (78); a rotary laser range finder (49) is slidably arranged on the suspension measuring rod (51), and can be controlled to move along the suspension measuring rod (51) through a vertical driving device, the laser emission angle is controlled through an angle adjusting device, and a second laser target center plate (50) is arranged on the rotary laser range finder (49);
during measurement, the angle rotating motor (62) is controlled to rotate by a certain angle alpha, and the horizontal laser range finder (78) is aligned with the first laser target plate (64) to measure the distance L 1 A vertical downward laser range finder (79) is aligned with the second laser target plate (50) to measure the distance H 1 The distance H from the reference surface (45) is measured by adjusting the rotation laser distance meter (49) to a vertical angle 2 Adjusting to a horizontal angle to measure the entity under the angleDistance L of outer surface of model (69) 2 ；
The erosion amount of the hearth carbon bricks is as follows: delta=l 1 －L 2 －R 0 Wherein R is 0 The design radius of the hearth is set;
and (3) adjusting the rotation angle of the angle rotating motor (62), the position of the horizontal laser range finder (78) in the horizontal direction and the position of the rotating laser range finder (49) in the height direction to obtain the erosion amount of the hearth carbon bricks at different angles and different heights.
3. The method for detecting the erosion state of the hearth of a blast furnace according to claim 2, wherein: the inner diameter of the annular track (46) is less than or equal to 2 times the designed inner diameter of the hearth.
4. A method for detecting a blast furnace hearth erosion state according to claim 3, wherein: the height of the beam (58) is measured to be >1 times the design height of the hearth.
5. The method for detecting a blast furnace hearth erosion state according to claim 4, wherein: the device also comprises a control processor (53), wherein the control processor (53) is electrically connected with each measuring device and each driving device in the third step.
6. The method for detecting the erosion state of the hearth of a blast furnace according to claim 1, wherein: in the first step, the specific process of removing and transferring the eroded carbon bricks (8) comprises the following steps: drilling a drilling hole (80) on the surface of an eroded carbon brick (8), installing a vertical hoisting bolt (9) and a lateral hoisting bolt (10), controlling a brick disassembly winch (75), and connecting the vertical hoisting bolt (9) through a lifting hook (14) to finish the hoisting action so as to loosen the eroded carbon brick (8); then, the corroded carbon bricks (8) are horizontally pulled to a lifting belt conveyor (76) through connection of the lifting hooks (14) and the side lifting bolts (10); the lifting belt conveyor (76) transfers the corroded carbon bricks (8) to the horizontal belt conveyor, the horizontal belt conveyor transfers the corroded carbon bricks (8) to a designated position, and then the corroded carbon bricks (8) are laid back through the bricklaying winch (43).
7. The method for detecting a blast furnace hearth erosion state according to claim 6, wherein: the four horizontal belt conveyors are in end-to-end cyclic operation.
8. The method for detecting a blast furnace hearth erosion state according to any one of claims 1 to 7, wherein: the method also comprises the following steps: and scanning the eroded hearth cavity (70) by adopting a 3D laser scanner (71) to obtain a stereoscopic image model, then adopting computer-aided software to obtain a horizontal or vertical section of the eroded hearth, and measuring and arranging the horizontal or vertical section by a computer to obtain a hearth erosion model.
9. The method for detecting a blast furnace hearth erosion state according to claim 8, wherein: the fourth step further comprises: and (3) comparing the data obtained in the step four with the hearth erosion model and comparing the data obtained in the step three with the hearth erosion model.
10. The method for detecting a blast furnace hearth erosion state according to any one of claims 1 to 7, wherein: in the second step, the industrial material is gypsum or resin or castable molding materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310601799.9A CN116855661A (en) | 2023-05-23 | 2023-05-23 | Method for detecting erosion state of blast furnace hearth |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310601799.9A CN116855661A (en) | 2023-05-23 | 2023-05-23 | Method for detecting erosion state of blast furnace hearth |
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| CN116855661A true CN116855661A (en) | 2023-10-10 |
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