CN112923731A - Local maintenance method for flash furnace bottom bricks - Google Patents
Local maintenance method for flash furnace bottom bricks Download PDFInfo
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- CN112923731A CN112923731A CN202110164769.7A CN202110164769A CN112923731A CN 112923731 A CN112923731 A CN 112923731A CN 202110164769 A CN202110164769 A CN 202110164769A CN 112923731 A CN112923731 A CN 112923731A
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- 239000011449 brick Substances 0.000 title claims abstract description 176
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000012423 maintenance Methods 0.000 title claims abstract description 13
- 238000005070 sampling Methods 0.000 claims abstract description 16
- 238000010298 pulverizing process Methods 0.000 claims abstract description 15
- 238000005553 drilling Methods 0.000 claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims abstract description 4
- 238000004062 sedimentation Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims abstract description 4
- 239000002893 slag Substances 0.000 claims description 21
- PTVDYARBVCBHSL-UHFFFAOYSA-N copper;hydrate Chemical compound O.[Cu] PTVDYARBVCBHSL-UHFFFAOYSA-N 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 230000008439 repair process Effects 0.000 claims description 6
- 238000005422 blasting Methods 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 7
- 238000003723 Smelting Methods 0.000 description 7
- 229910052802 copper Inorganic materials 0.000 description 7
- 239000010949 copper Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000009529 body temperature measurement Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011822 basic refractory Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
- F27D1/1694—Breaking away the lining or removing parts thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
A flash furnace bottom brick local overhauling method comprises the following specific steps: s1, measuring the temperature of the flash furnace before stopping the furnace; s2, respectively judging temperature difference values; s3, determining the range of the hearth bricks needing to be overhauled; s4, drilling holes in a sedimentation tank furnace wall of the flash furnace in a segmented mode by using an air drill to obtain a plurality of groups of sampling holes; observing the pulverization condition of the hearth bricks from the sampling holes and the removed substances; s5, observing the hearth brick from the sampling hole and testing brick powder obtained in the drilling process to determine the pulverization degree of the hearth brick; s6, determining the overhaul range of the hearth bricks according to the pulverization degree of the hearth bricks; and S7, removing the hearth bricks determined to need to be removed, and replacing the hearth bricks again. The invention can locally overhaul the furnace bottom bricks in the flash furnace without completely replacing the furnace bottom bricks, thereby ensuring the safe operation of the flash furnace, greatly reducing the maintenance cost of the flash furnace and improving the maintenance efficiency of the flash furnace.
Description
Technical Field
The invention relates to the technical field of non-ferrous metal metallurgical furnaces, in particular to a flash furnace bottom brick local overhauling method.
Background
Flash furnaces are a kind of smelting furnace with intensified production. The powder material with huge surface area is fully contacted with oxygen in the furnace, and the controllable oxidation reaction of the sulfide is completed at a very high speed at high temperature. The large amount of heat released by the reaction is supplied to the smelting process, and the self-heating smelting is possible by using materials with high sulfur content. The flash furnace has the characteristics of high production rate, low energy consumption and high concentration of sulfur dioxide in flue gas. At present, a flash furnace is mainly used for smelting sulfide concentrate such as copper, nickel and the like; a Guixi smelting plant of Jiangxi copper industry group builds a flash furnace in 80 years, and in the production process of many years, when a copper water jacket in the flash furnace and a water cooling element above a furnace wall leak water, the water slowly permeates into a furnace bottom refractory brick from the upper part of the flash furnace along the furnace wall; the firebrick is mostly basic refractory material in the stove bottom, and basic firebrick meets water and can take place hydrolysis, has changed the inner structure of nai firebrick, appears the pulverization deformation phenomenon, can outwards expand, causes the stove bottom outwards bulging of steel construction all around, has also increased the risk of copper liquid seepage simultaneously, influences the safe operation of stove.
Referring to the repair cases of flash furnaces at home and abroad, the replacement period of the refractory bricks at the furnace bottom is generally 2 service (one service is 8-10 years), the whole refractory bricks need to be replaced, flash furnaces of Guixi smelting plants of the Jiangxi copper industry group have been operated for 34 years, from the condition of previous shutdown maintenance, the furnace bottom of the flash furnaces is coated with thick slag which is more than 1 meter thick after shutdown, the slag is rich in metals such as copper, iron and the like, and is difficult to remove, the whole refractory bricks at the furnace bottom are difficult to replace completely, the consumed time is long, and the replacement cost is high.
Disclosure of Invention
Objects of the invention
The invention provides a flash furnace bottom brick local maintenance method, which can locally maintain the flash furnace bottom bricks without completely replacing the bottom bricks, can ensure the safe operation of the flash furnace, greatly reduce the maintenance cost of the flash furnace, improve the maintenance efficiency of the flash furnace, efficiently and quickly disassemble and assemble the bottom slag, cannot damage the bottom bricks which can be continuously used, greatly improve the utilization rate of the bottom bricks, and further reduce the maintenance cost of the flash furnace.
(II) technical scheme
The invention provides a flash furnace bottom brick local overhauling method, which comprises the following specific steps:
s1, before the flash furnace is stopped, measuring the temperature of the bottom bricks of the flash furnace;
s2, respectively judging whether the difference value between the measured temperature value and the temperature value of the lossless hearth bricks is greater than a set value;
s3, if the difference value between the measured temperature value and the temperature value of the lossless hearth bricks is smaller than a set value, the hearth bricks do not need to be overhauled;
if the difference value between the measured temperature value and the lossless furnace bottom brick temperature value is larger than a set value, the furnace bottom brick is seriously worn and needs to be overhauled;
s4, drilling holes in a sedimentation tank furnace wall of the flash furnace in a segmented mode by using an air drill to obtain a plurality of groups of sampling holes; observing the pulverization condition of the hearth bricks from the sampling holes and the removed substances;
s5, observing the hearth brick from the sampling hole and testing brick powder obtained in the drilling process to determine the pulverization degree of the hearth brick;
s6, determining the overhaul range of the hearth bricks according to the pulverization degree of the hearth bricks;
and S7, removing the hearth bricks determined to need to be removed, and replacing the hearth bricks again.
Preferably, when the temperature of the bottom bricks of the flash furnace is measured in S1, a plurality of sets of temperature measuring points are arranged at equal intervals along the axial direction of the bottom surface of the submerged furnace, and a plurality of sets of temperature detecting devices are installed at the plurality of sets of temperature measuring points to measure the temperature.
Preferably, after the powdered firebricks are removed in S7, the remaining used bricks are hammered using a checker hammer,
if the old brick is knocked to make a crisp sound, the old brick can be used continuously;
if the sound generated when the old brick is knocked is unclear, the old brick is damaged and needs to be replaced.
Preferably, the specific steps of dismantling the hearth bricks in S7 are as follows:
s71, removing the furnace wall bricks of the flash furnace;
s72, removing the shell steel plate, the square steel, the copper water jacket fixing piece, the casting material and the copper water jacket until the lowest horizontal copper water jacket is reached; finally, removing the horizontal copper water jacket at the bottommost part;
s73, disassembling and assembling the slag in the flash furnace by adopting a blasting disassembly mode to obtain upper slag, wherein the thickness of the residual slag in the flash furnace is 500 +/-5 mm away from the bottom brick;
s74, drilling holes in the residual slag along the axial direction to obtain a plurality of groups of holes; a group of pneumatic pick drill rods are arranged in each group of holes to extrude the residual slagging until cracks appear in the residual slagging;
s75, removing the residual slag along the crack to obtain lower slag, and forming a movable space at the bottom of the flash furnace;
and S76, removing and replacing the hearth bricks on the bottom surface of the movable space.
Preferably, before the hearth bricks are removed in S76, the hearth arch springing bricks are removed first, and then the hearth bricks to be replaced are removed.
Preferably, before replacing the new bottom brick in S76, the old bottom brick interface in the flash furnace bottom is ground or a leveling layer is built on the old bottom brick interface using a ramming material, resulting in the old bottom brick having a smooth interface surface.
Compared with the prior art, the technical scheme of the invention has the following beneficial technical effects:
in the invention, when the bottom bricks of the flash furnace are inspected, the range for overhauling the bottom bricks at the bottom of the flash furnace is finally determined by a temperature measurement detection mode and a drill hole sampling detection brick body pulverization degree, the bottom bricks needing to be overhauled can be removed and replaced, all the bottom bricks at the bottom of the flash furnace do not need to be renovated, the cost for maintaining the bottom bricks in the flash furnace is reduced, and the efficiency for maintaining the bottom bricks is improved;
in the invention, because the furnace bottom slagging is too thick, the difficulty of one-time removal is very high, and the furnace bottom bricks which are not damaged at the bottom of the flash furnace are easily damaged, in order to protect and avoid the furnace bottom bricks which can be normally used, when the furnace bottom slagging is removed, a part of slagging is firstly removed by blasting, then the remaining slagging is extruded by using an air pick drill rod to generate cracks, the furnace bottom slagging is continuously removed along the cracks to form an active space, and the active space can be continuously expanded along with the removal of the furnace bottom slagging, so that the furnace bottom bricks which need to be removed can be conveniently removed and replaced; in addition, the old bottom brick joint surface in the bottom of the flash furnace is polished or a leveling layer is constructed on the old bottom brick joint surface by using a ramming material to obtain the old bottom brick with a smooth joint surface, and then a compact masonry is formed when the new bottom brick and the old bottom brick are glued after the new bottom brick is installed, so that the risk of copper infiltration of the flash furnace in production is greatly reduced;
the operation cycle of the flash furnace is generally 20 years, the flash furnace of the Guixi smelting plant adopts the flash furnace bottom brick local maintenance method improved by the invention, 34-year ultra-long service of the flash furnace is realized and the flash furnace continues to be continuously serviced, and the use mode of the flash furnace is changed; according to the estimation, the total renovation and removal cost of the flash furnace bottom is about 1200 ten thousand yuan, the removal cost of the refractory bricks partially excavated and repaired by adopting the blasting and drilling extrusion method is about 200 ten thousand yuan, the economic benefit is considerable, the repair cost is greatly reduced, the repair progress is more controllable, and the method is worthy of popularization.
Drawings
FIG. 1 is a flow chart of a flash furnace bottom brick local overhaul method provided by the invention.
FIG. 2 is a schematic view of a furnace bottom temperature measuring point and a drill hole sampling in the flash furnace bottom brick local overhaul method provided by the invention.
FIG. 3 is a schematic structural diagram of a flash furnace with a removable bottom in a local repair method of bottom bricks.
FIG. 4 is a schematic structural diagram of a flash furnace bottom brick local overhaul method provided by the invention in a state of local overhaul of the bottom brick.
Reference numerals: 1. measuring temperature points; 2. a sampling hole; 3. shell steel plates and square steel; 4. a copper water jacket fixing piece; 5. pouring a material; 6. a copper water jacket; 7. furnace bottom arch foot bricks; 8. furnace wall bricks; 9. a hole; 10. a pneumatic pick drill rod; 11. slagging at the upper part; 12. slagging at the lower part; 13. a hearth brick; 14. an activity space; 15. and (4) leveling layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
As shown in FIGS. 1 to 4, the method for locally overhauling the bottom bricks of the flash furnace provided by the invention comprises the following specific steps:
s1, measuring the temperature of the bottom bricks 13 of the flash furnace before the flash furnace is stopped;
s2, respectively judging whether the difference value between the measured temperature value and the temperature value of the lossless hearth bricks 13 is greater than a set value; it should be noted that the lossless hearth brick 13 is a brick body of the new hearth brick 13 which reaches a temperature state after being used for a period of time, and the temperature of the structural performance temperature hearth brick 13 is detected, that is, a temperature value of the lossless hearth brick 13 is obtained;
s3, if the difference value between the measured temperature value and the temperature value of the lossless hearth bricks 13 is smaller than a set value, the hearth bricks 13 do not need to be overhauled; it should be noted that the set value is determined according to the working conditions of different furnace bodies and the past use experience;
if the difference value between the measured temperature value and the temperature value of the lossless hearth bricks 13 is larger than the set value, the fact that the hearth bricks 13 are seriously worn and need to be overhauled is indicated;
s4, drilling holes in a sedimentation tank furnace wall of the flash furnace in a segmented mode by using an air drill to obtain a plurality of groups of sampling holes 2; observing the pulverization condition of the hearth bricks from the sampling hole 2 and the removed substances;
s5, observing the bottom bricks 13 from the sampling holes 2 and testing brick powder obtained in drilling to determine the pulverization degree of the bottom bricks 13;
s6, determining the overhaul range of the hearth bricks 13 according to the pulverization degree of the hearth bricks 13;
and S7, removing the hearth bricks 13 determined to need to be removed, and replacing the hearth bricks 13 again.
In one embodiment of the invention, when the bottom bricks 13 of the flash furnace are inspected, the range of the flash furnace bottom bricks 13 to be repaired is finally determined by detecting the pulverization degree of the bricks through a temperature measurement detection mode and a drilling sampling mode, the bottom bricks 13 to be repaired are removed and replaced, all the bottom bricks 13 at the bottom of the flash furnace do not need to be renovated, the repair cost of the bottom bricks 13 in the flash furnace is reduced, and the maintenance efficiency of the flash furnace is improved.
In an optional embodiment, when the temperature of the bottom bricks 13 of the flash furnace is measured in S1, a plurality of sets of temperature measuring points 1 are arranged at equal intervals along the axial direction of the bottom surface of the submerged tank furnace, a plurality of sets of temperature detecting devices are installed at the plurality of sets of temperature measuring points 1 to measure the temperature, the loss condition of the bottom bricks 13 is judged according to the temperature change, and the overhaul range of the bottom bricks 13 is further preliminarily determined; wherein, the reaction tower area of the flash furnace is emphatically detected during temperature measurement.
In an alternative embodiment, after the powdered refractory bricks are removed in S7, the remaining used bricks are hammered using a check hammer,
if the old brick is knocked to make a crisp sound, the old brick can be used continuously;
if the sound emitted when the old brick is knocked is unclear, the old brick is damaged and needs to be replaced;
during the use, carry out the brick that hammering surplus old brick will not use through the inspection hammer and demolish, leave the brick body that can continue to use, reduce the cost of maintenance of flash stove, improve the utilization ratio of the brick body.
In an alternative embodiment, the specific steps of removing the hearth bricks in S7 are as follows:
s71, removing the furnace wall bricks 8 of the flash furnace;
s72, removing the shell steel plate and the square steel 3, the copper water jacket fixing piece 4, the castable 5 and the copper water jacket 6 until the lowest horizontal copper water jacket 6 is reached; finally, the bottommost horizontal copper water jacket 6 is dismantled;
s73, disassembling and assembling the slag in the flash furnace by adopting a blasting disassembly mode to obtain upper slag 11, wherein the thickness of the residual slag in the flash furnace is 500 +/-5 mm away from the bottom brick;
s74, drilling holes on the residual slag along the axial direction to obtain a plurality of groups of holes 9; a group of pneumatic pick drill rods 10 are arranged in each group of holes 9 to extrude the residual slagging until cracks appear in the residual slagging;
s75, removing the residual slag along the crack to obtain lower slag 12, and forming a movable space 14 at the bottom of the flash furnace;
s76, removing and replacing the hearth bricks 13 on the bottom surface of the movable space 14;
during the use, because the stove bottom slagging scorification is too thick, the disposable difficulty of demolising is very big, and cause the damage to the stove bottom brick 13 of the no damage of flash stove bottom easily, avoid to the stove bottom brick 13 that can normally use for the protection, when demolising the stove bottom slagging scorification, blast and demolish partly slagging scorification first, recycle pneumatic pick borer 10 in order to extrude the production crack to surplus slagging scorification, continue to demolish the stove bottom slagging scorification along the crack, form an activity space 14, and along with demolising of stove bottom slagging digestion, activity space 14 can constantly enlarge, and then the change is demolishd to the stove bottom brick 13 that needs demolish to the convenience.
In an alternative embodiment, the bottom arch support bricks 7 are removed and then the bottom bricks 13 to be replaced are removed before the bottom bricks 13 are removed in S76.
In an alternative embodiment, before replacing the new bottom brick 13 in S76, the interface of the old bottom brick 13 in the bottom of the flash furnace is polished or a leveling layer 15 is formed on the interface of the old bottom brick 13 by using a ramming material, so as to obtain the old bottom brick 13 with a smooth interface surface, and then after installing the new bottom brick 13, a tight masonry is formed when the new bottom brick 13 and the old bottom brick 13 are bonded, thereby greatly reducing the risk of copper infiltration in the production of the flash furnace.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (6)
1. A flash furnace bottom brick local maintenance method is characterized by comprising the following specific steps:
s1, measuring the temperature of the bottom bricks (13) of the flash furnace before the flash furnace is stopped;
s2, respectively judging whether the difference value between the measured temperature value and the temperature value of the lossless hearth brick (13) is greater than a set value;
s3, if the difference value between the measured temperature value and the temperature value of the lossless hearth brick (13) is smaller than a set value, the hearth brick (13) does not need to be overhauled;
if the difference value between the measured temperature value and the temperature value of the lossless hearth bricks (13) is greater than a set value, the fact that the hearth bricks (13) are seriously worn and need to be overhauled is indicated;
s4, drilling holes on the wall of the sedimentation tank of the flash furnace in a segmented manner by using an air drill to obtain a plurality of groups of sampling holes (2); observing the furnace bottom brick pulverization condition from the sampling hole (2) and the removed object thereof;
s5, observing the hearth bricks (13) from the sampling holes (2) and testing brick powder obtained in the drilling process to determine the pulverization degree of the hearth bricks (13);
s6, determining the overhaul range of the hearth bricks (13) according to the pulverization degree of the hearth bricks (13);
and S7, removing the hearth bricks (13) determined to need to be removed, and replacing the hearth bricks (13).
2. The method for local overhaul of the bottom bricks of the flash furnace according to claim 1, wherein in the step S1, when the bottom bricks (13) of the flash furnace are measured, a plurality of groups of temperature measuring points (1) are arranged at equal intervals along the axial direction of the bottom surface of the submerged furnace, and a plurality of groups of temperature detecting devices are arranged at the plurality of groups of temperature measuring points (1) for measuring the temperature.
3. The flash furnace bottom brick local repair method according to claim 1, wherein after the powdered refractory bricks are removed in S7, the remaining old bricks are hammered using a check hammer,
if the old brick is knocked to make a crisp sound, the old brick can be used continuously;
if the sound generated when the old brick is knocked is unclear, the old brick is damaged and needs to be replaced.
4. The flash furnace bottom brick local overhaul method according to claim 1, wherein the specific steps of removing the bottom bricks in S7 are as follows:
s71, removing the furnace wall bricks (8) of the flash furnace;
s72, removing the shell steel plate and the square steel (3), the copper water jacket fixing piece (4), the casting material (5) and the copper water jacket (6) until the lowest horizontal copper water jacket (6) is reached; finally, dismantling the horizontal copper water jacket (6) at the bottommost part;
s73, disassembling and assembling the slag in the flash furnace by adopting a blasting disassembly mode to obtain upper slag (11), wherein the thickness of the residual slag in the flash furnace is 500 +/-5 mm away from the bottom brick;
s74, drilling holes on the residual slag along the axial direction to obtain a plurality of groups of holes (9); a group of pneumatic pick drill rods (10) are arranged in each group of holes (9) to extrude the residual slagging until cracks appear in the residual slagging;
s75, removing the residual slag along the crack to obtain lower slag (12), and forming a movable space (14) at the bottom of the flash furnace;
s76, the hearth bricks (13) on the bottom surface of the movable space (14) are removed and replaced.
5. The flash furnace bottom brick local overhaul method according to claim 4, wherein before the bottom bricks (13) are removed in S76, the bottom arch foot bricks (7) are removed and then the bottom bricks (13) to be replaced are removed.
6. The flash furnace bottom brick local overhaul method according to claim 4, wherein before replacing the new bottom brick (13) in the S76, the old bottom brick (13) interface in the flash furnace bottom is ground or a leveling layer (15) is built on the old bottom brick (13) interface by using a ramming material, so that the old bottom brick (13) with a smooth interface surface is obtained.
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Application publication date: 20210608 |