CN102735060B - Flame gunning technique - Google Patents
Flame gunning technique Download PDFInfo
- Publication number
- CN102735060B CN102735060B CN201110085535.XA CN201110085535A CN102735060B CN 102735060 B CN102735060 B CN 102735060B CN 201110085535 A CN201110085535 A CN 201110085535A CN 102735060 B CN102735060 B CN 102735060B
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- China
- Prior art keywords
- valve
- converter
- preheating
- batch
- flame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000007921 spray Substances 0.000 claims abstract description 38
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 28
- 239000010959 steel Substances 0.000 claims abstract description 28
- 239000000843 powder Substances 0.000 claims abstract description 21
- 229910052786 argon Inorganic materials 0.000 claims abstract description 15
- 238000007599 discharging Methods 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 239000002893 slag Substances 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 24
- 230000008439 repair process Effects 0.000 claims description 22
- 238000005507 spraying Methods 0.000 abstract description 7
- HSFWRNGVRCDJHI-UHFFFAOYSA-N Acetylene Chemical compound C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 abstract description 6
- 239000011248 coating agent Substances 0.000 abstract description 6
- 238000000576 coating method Methods 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 4
- 230000009970 fire resistant effect Effects 0.000 abstract 3
- 238000007670 refining Methods 0.000 abstract 3
- 238000005245 sintering Methods 0.000 abstract 2
- 238000003723 Smelting Methods 0.000 abstract 1
- 238000005260 corrosion Methods 0.000 abstract 1
- 238000002844 melting Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 238000009991 scouring Methods 0.000 abstract 1
- 230000008569 process Effects 0.000 description 7
- 238000009628 steelmaking Methods 0.000 description 7
- 239000007767 bonding agent Substances 0.000 description 5
- 239000011819 refractory material Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000007664 blowing Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000011449 brick Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000001066 destructive effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 2
- 238000010285 flame spraying Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
A flame gunning technique is a technique method for spraying and mending a lining of a steel refining furnace. The spraying method comprises the steps: heating fire-resistant powder in a material tank to 700-1500 DEG C at the material tank body rotation speed of 0-20 turns/min; connecting the discharge port of the material tank, O2, argon and C2H2 with the tail of a spray gun, and opening the O2, C2H2 and a discharging valve; and sintering the fire-resistant powder into a smelting state by utilizing a focused flame belt of 2500 DEG C, and then spraying. The mending method is basically identical to the operation of the spraying method and specially comprises the steps of: before opening the discharging valve, melting slag on the surface of a part corroded by molten steel by utilizing the focused high temperature of 2500 DEG C and then sintering a cross-shaped groove; and then opening the discharging valve for mending. The fire-resistant powder for flame gunning does not contain water, thus improving the density of a coating and anti-corrosion anti-scouring performance of the coating on molten steel, reducing the thickness of the lining and the motor power of a converter and further achieving the purpose of reducing the cost of each tonnage steels. The flame gunning technique solves the problems that the lining of the steel refining furnace is thick, the motor power of the converter is large and the steel refining furnace needs stopping for mending.
Description
Technical field
The present invention relates to the technological process of a kind of integral spray and repairing, be specifically related to the technological process to iron company's converter liner integral spray and repairing.
Background technology
The material of iron company's converter liner is all refractory material.No matter this liner is that brick one brick assembles or integrated poured, all contains water and bonding agent.After oven dry, the space that water and bonding agent take has just become pore, and the porosity is high, and the erosion-resisting characteristics to molten steel and scour resistance are just low, and refractory lining just need to be thicker, and its thickness is 800mm～900mm.Add that the outer steel frame construction of converter is large, cause converter overall weight larger, thereby make converter rotary electric machine power huge, ton steel cost is high.The new converter of China on average refines after 300 stove～400 stove molten steel, and liner is just corroded to such an extent that have pit to occur by molten steel, in order not make breakdown just needs repair in time.At present, be all to adopt half-dried spraying method to implement to repair both at home and abroad.Half-dried spray repair is exactly that a middle pipe carries refractory powder, one of outside pipe to carry water (to do bonding agent use, play again cooling effect.)。What fear most because of refractory material is extremely cold very hot, half-dried spray repair is ejected into liner, and (liquid steel temperature is 1680 DEG C, after pouring out molten steel, also have more than 1500 DEG C) on water can evaporate immediately-that Here it is is extremely cold very hot, infringement to refractory lining is very big, thereby half-dried spray repair is destructive repairing, it is the way of having no idea.When existing converter liner need to be repaired, generally all need blowing out to cool to 1200 DEG C and just can repair below.Half-dried gun performance parameter is: every repairing once---feed consumption: 5 tons～6 tons; Consuming time: 30 minutes～50 minutes; Steel-making: 3 stove～4 stoves.This just causes, and steel-making efficiency is low, ton steel cost is high, converter furnace life is short, economic loss is large.
Summary of the invention
The object of this invention is to provide a kind of flame gunning technological process---the technological process of flame gunning is exactly refractory material to be burnt till to molten condition be ejected in converter and be lining with.Because sprayed coating is not moisture, do not contain bonding agent, so the density of sprayed coating has improved greatly, also just improve erosion-resisting characteristics and the scour resistance of sprayed coating to molten steel.The problem that the present invention solves is: converter refractory lining thicker (800mm～900mm), converter overall weight are larger, the huge high problem of ton steel cost that causes of converter rotary electric machine power; The another one problem that the present invention solves is that converter needs blowing out cooling to implement destructive problem of repairing; The 3rd problem that the present invention solves is short problem of converter furnace life.
For realizing goal of the invention, flame gunning technological process of the present invention adopts following technical scheme:
The method of converter liner being carried out to integral spray is to operate in accordance with the following steps:
(1) preheating: refractory powder is poured in preheating batch can and is heated to 700 DEG C～1500 DEG C, in heating process, the rotating speed of preheating batch can body is 0～20 rev/min;
(2) integral spray: the discharging opening of preheating batch can is connected with the afterbody of spray gun, and by O
2, argon gas, C
2h
2source of the gas is connected with the corresponding interface of spray gun afterbody by pipeline.According to spraying operational procedure-open successively O
2, C
2h
2after valve, then open blanking valve.Utilize C
2h
2leave the 1.5 meters of left and right of 2500 DEG C of flame belt lengths of high temperature that focus on after nozzle, refractory powder is burnt till after molten condition, new converter liner is carried out to integral spray.After having sprayed, close successively blanking valve, C
2h
2valve, O
2valve; And open in time argon gas valve 30 seconds to clean C
2h
2pipeline.
The method that converter liner is repaired is to operate in accordance with the following steps:
(1) preheating: refractory powder is poured in preheating batch can and is heated to 700 DEG C～1500 DEG C, in heating process, the rotating speed of preheating batch can body is 0～20 rev/min;
(2) converter liner gives processing: the discharging opening of preheating batch can is connected with the afterbody of spray gun, and by O
2, argon gas, C
2h
2source of the gas is connected with the corresponding interface of spray gun afterbody by pipeline.According to repair operation code-open successively O
2, C
2h
2after valve, utilize acetylene to leave to focus on the high temperature at 2500 DEG C, nozzle back focus place that converter liner is first melted away by one deck slag on molten steel attack sites surface, then burn cross recess being etched on the exposed refractory lining out in position;
(3) repair: complete after above-mentioned (two) step, open in time blanking valve and repair.After repairing completes, close successively blanking valve, C
2h
2valve, O
2valve; And open in time argon gas valve 30 seconds to clean C
2h
2pipeline.
Flame gunning technological process of the present invention, has improved erosion-resisting characteristics and the scour resistance of not moisture, not contain bonding agent Monofrax sprayed coating to molten steel greatly.Due to these superior functions, converter liner (original refractory thickness is 800mm～900mm) entirety is being carried out after flame-spraying, integral lining thickness will reduce nearly 1/3rd, add the outer steel frame construction of converter, overall weight reduces nearly 1/3rd, thereby it is nearly 1/3rd that the power of motor that converter is rotated reduces, finally reach the object that reduces ton steel cost.On the other hand, the temperature in converter is higher, is more conducive to the enforcement of flame gunning.That is to say, rotate by converter, as long as the position of being corroded by molten steel can be revealed, flame gunning technological process of the present invention just can be implemented to repair under the condition of not blowing out steel-making, thereby has greatly improved steel-making efficiency, has obtained larger economic benefit.
Detailed description of the invention
Flame gunning process chart is as shown in drawings:
Embodiment mono-
Flame gunning technique, the method for converter liner being carried out to integral spray is to operate in accordance with the following steps:
(1) preheating: refractory powder is poured in preheating batch can and is heated to 700 DEG C～1500 DEG C, in heating process, the rotating speed of preheating batch can body is 0～20 rev/min;
(2) integral spray: the discharging opening of preheating batch can is connected with the afterbody of spray gun, and by O
2, argon gas, C
2h
2source of the gas is connected with the corresponding interface of spray gun afterbody by pipeline.According to spraying operational procedure-open successively O
2, C
2h
2after valve, then open blanking valve.Utilize C
2h
2leave the 1.5 meters of left and right of 2500 DEG C of flame belt lengths of high temperature that focus on after nozzle, refractory powder is burnt till after molten condition, new converter liner is carried out to integral spray.After having sprayed, close successively blanking valve, C
2h
2valve, O
2valve; And open in time argon gas valve 30 seconds to clean C
2h
2pipeline.
Embodiment bis-
The method that converter liner is repaired is to operate in accordance with the following steps:
(1) preheating: refractory powder is poured in preheating batch can and is heated to 700 DEG C～1500 DEG C, in heating process, the rotating speed of preheating batch can body is 0～20 rev/min;
(2) converter liner gives processing: the discharging opening of preheating batch can is connected with the afterbody of spray gun, and by O
2, argon gas, C
2h
2source of the gas is connected with the corresponding interface of spray gun afterbody by pipeline.According to repair operation code-open successively O
2, C
2h
2after valve, utilize acetylene to leave to focus on the high temperature at 2500 DEG C, nozzle back focus place that converter liner is first melted away by one deck slag on molten steel attack sites surface, then burn cross recess being etched on the exposed refractory lining out in position;
(3) repair: complete after above-mentioned (two) step, open in time blanking valve and repair.After repairing completes, close successively blanking valve, C
2h
2valve, O
2valve; And open in time argon gas valve 30 seconds to clean C
2h
2pipeline.
Concrete operation method of the present invention is:
(1) preheating batch can: preheating batch can, before spray repair, is first heated to 700 DEG C～1500 DEG C refractory material, the refractory powder of different formulations can heat the different temperature points in temperature section so far.The average fusing point of refractory powder is 2000 DEG C, can be only having the refractory powder of 600 DEG C of left and right to burn till molten condition apart from fusing point by the thermal-flame bands of 2500 DEG C.After spray repair layer solidifies, because it is not moisture, do not contain binding agent, the density of spray repair layer has improved greatly, and erosion-resisting characteristics and the scour resistance of spray repair layer to molten steel improved greatly.Due to these superior functions, converter liner (existing refractory lining thickness is 800mm～900mm) entirety is being carried out after flame-spraying, integral lining thickness will reduce nearly 1/3rd, the outer steel frame construction weight reducing nearly 1/3rd of converter thereupon, thereby it is nearly 1/3rd that the power of motor that converter is rotated reduces, finally reach the object that reduces ton steel cost.On the other hand, the temperature in converter is higher, is more conducive to the enforcement of flame gunning.That is to say, rotate by converter, as long as the position of being corroded by molten steel can be revealed, flame gunning just can be implemented to repair under the condition of not blowing out steel-making, thereby has greatly improved steel-making efficiency.
(2) spray tip: the gas by this structure nozzle can be realized focusing leaving a certain designed distance place, nozzle front, thereby reaches focusing effect.That is to say, inflammable gas is to leave after nozzle temperature more and more higher, and the temperature at focus place can reach 2500 DEG C of left and right.The refractory material that so high temperature band can be fully 2000 DEG C average fusing point burns till molten condition; Also can more easily realize three steps of flame gunning: 1. converter liner is first melted away by one deck slag on molten steel attack sites surface; 2. on the exposed refractory lining out in position, burn " ten " word groove being etched; 3. refractory powder being burnt till to molten condition is ejected into and is etched position.
Flame gunning machine performance parameter, repairs once, consuming time: 25 minutes-30 minutes; Feed consumption: 0.8 ton-1.2 tons; Steel-making: 20 stove-30 stoves.
(3) work engineering: the refractory powder in preheating batch can is warming up to 700 DEG C～1500 DEG C needs 50 minutes～80 minutes from normal temperature.That is to say, before 50 minutes～80 minutes before converter liner need to be repaired, preheating batch can will start in advance, operate according to preheating batch can capability operation code.
Preheating batch can operational procedure is shown in the preheating batch can of flame gunning artwork:
1, refractory powder is poured in batch can 2, then cover lid stepping up;
2, smoke evacuation collector 1 is pushed away to the right, the right import of the collector 1 that makes to discharge fume is docked with the outlet flue on batch can 2 lids, is located by position-sensing switch;
3, connect inflammable gas air inlet 8 and light;
4, open motor 3 switches, make the driving gear 5 on motor drive the gear ring 9 on batch can 2 to start rotation;
5, when the interior refractory powder temperature of batch can 2 reaches after design temperature, disconnect easy fuel gas source, lay down the parts on air inlet 8, on air inlet 8 (being discharging opening), install discharge valve;
6, open position-sensing switch, smoke evacuation collector 1 is also located to left translation to desired location;
7, open hydraulic cylinder 6, batch can 2 center lines are risen to and become α angle position with level along axle 7.
8, technical requirement; 85 ° of 1.40 ° of < α <; The clean container V of batch can inner chamber (rice
3) 0.5 < V < 8; Batch can rotation speed n (rev/min) 0 < n < 20; 700 DEG C～1500 DEG C of cavity temperatures in batch can.
9, treat that the refractory powder in preheating batch can is heated to design temperature, after its discharging opening connects with spray gun afterbody, moved before converter by electric control system controls chassis, and detect that by the infrared detecting device on spray gun converter liner moves spray gun while being etched position, spray tip is aimed at and is etched position, spray gunning refractory---first open O
2valve, then open C
2h
2valve, opens preheating batch can blanking valve after normal operation.After infrared detecting device detects that spray repair completes, first close blanking valve, then close C
2h
2valve, finally closes O2 valve, and will open in time argon gas valve 30 seconds to rinse C
2h
2residual gas in pipeline, closes argon gas valve after 30 seconds.Kept in the center by electric control system controls chassis.
Above embodiment is the more preferably one of detailed description of the invention of the present invention, and the common variation that those skilled in the art carry out within the scope of the technical program and replacement should be included in protection scope of the present invention.
Claims (1)
1. flame gunning technique, is characterized in that, the method for converter liner being carried out to integral spray is to operate in accordance with the following steps:
(1) preheating: refractory powder is poured in preheating batch can and is heated to 700 DEG C～1500 DEG C, in heating process, the rotating speed of preheating batch can body is 0～20 rev/min; After having heated, the center line of preheating batch can body rises to and becomes 40 °～85 ° with level;
(2) integral spray: the discharging opening of preheating batch can is connected with the afterbody of spray gun, and by O
2, argon gas, C
2h
2source of the gas is connected with the corresponding interface of spray gun afterbody by pipeline, opens successively O
2, C
2h
2after valve, then open blanking valve, utilize C
2h
2leave the 2500 DEG C of flame zones of 1.5 meters of length, temperature that focus on after nozzle, refractory powder is burnt till after molten condition, new converter liner is carried out to integral spray, after having sprayed, close successively blanking valve, C
2h
2valve, O
2valve; And open in time argon gas valve 30 seconds to clean C
2h
2pipeline;
The method that converter liner is repaired is to operate in accordance with the following steps:
(1) preheating: refractory powder is poured in preheating batch can and is heated to 700 DEG C～1500 DEG C, in heating process, the rotating speed of preheating batch can body is 0～20 rev/min;
(2) converter liner pretreatment: the discharging opening of preheating batch can is connected with the afterbody of spray gun, and by O
2, argon gas, C
2h
2source of the gas is connected with the corresponding interface of spray gun afterbody by pipeline, opens successively O
2, C
2h
2after valve, utilize C
2h
2the high temperature that leaves 2500 DEG C, focusing nozzle back focus place is first melted away converter liner by one deck slag on surface, molten steel attack sites place, then is etched on the exposed refractory lining out in position and burns cross recess at converter liner;
(3) repair: complete after the pretreatment of converter liner, open blanking valve and repair, after having repaired, close successively blanking valve, C
2h
2valve, O
2valve; And open in time argon gas valve 20 seconds to clean C
2h
2pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110085535.XA CN102735060B (en) | 2011-04-06 | 2011-04-06 | Flame gunning technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110085535.XA CN102735060B (en) | 2011-04-06 | 2011-04-06 | Flame gunning technique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102735060A CN102735060A (en) | 2012-10-17 |
| CN102735060B true CN102735060B (en) | 2014-10-29 |
Family
ID=46991015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110085535.XA Expired - Fee Related CN102735060B (en) | 2011-04-06 | 2011-04-06 | Flame gunning technique |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102735060B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2072207U (en) * | 1990-05-28 | 1991-02-27 | 中国人民解放军八一○六五部队起重机厂 | Material leading type machine for spraying and repairing furnace lining by semi-dry method |
| CN2144802Y (en) * | 1992-10-31 | 1993-10-27 | 魏俊杰 | Machine for repairing lining of steel-smelting furnace |
| US5415692A (en) * | 1988-03-17 | 1995-05-16 | Kurosaki Refractories Co., Ltd. | Apparatus for applying material against the wall of a molten metal discharging hole |
-
2011
- 2011-04-06 CN CN201110085535.XA patent/CN102735060B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5415692A (en) * | 1988-03-17 | 1995-05-16 | Kurosaki Refractories Co., Ltd. | Apparatus for applying material against the wall of a molten metal discharging hole |
| CN2072207U (en) * | 1990-05-28 | 1991-02-27 | 中国人民解放军八一○六五部队起重机厂 | Material leading type machine for spraying and repairing furnace lining by semi-dry method |
| CN2144802Y (en) * | 1992-10-31 | 1993-10-27 | 魏俊杰 | Machine for repairing lining of steel-smelting furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102735060A (en) | 2012-10-17 |
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| C06 | Publication | ||
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
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| TR01 | Transfer of patent right |
Effective date of registration: 20201113 Address after: No.16, dongbanqiao Road, Shizhuang Town, Rugao City, Nantong City, Jiangsu Province, 226000 Patentee after: Nantong Xingshi material Trade Co., Ltd Address before: 471000 10-3-501, block fifty, Jianxi District, Henan, Luoyang Patentee before: Chang Junchen |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141029 Termination date: 20210406 |