CN102735060A - Flame gunning technique - Google Patents
Flame gunning technique Download PDFInfo
- Publication number
- CN102735060A CN102735060A CN201110085535XA CN201110085535A CN102735060A CN 102735060 A CN102735060 A CN 102735060A CN 201110085535X A CN201110085535X A CN 201110085535XA CN 201110085535 A CN201110085535 A CN 201110085535A CN 102735060 A CN102735060 A CN 102735060A
- Authority
- CN
- China
- Prior art keywords
- valve
- converter
- preheating
- flame
- batch
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 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 22
- 229910052786 argon Inorganic materials 0.000 claims abstract description 15
- 238000007599 discharging Methods 0.000 claims abstract description 12
- 238000005507 spraying Methods 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 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 21
- 238000005516 engineering process Methods 0.000 claims description 6
- 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
- 239000000779 smoke Substances 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
- 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
- 239000012467 final product Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000002737 fuel gas 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)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (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 technological process iron company's converter liner integral spray and repairing.
Background technology
The material of iron company's converter liner all is a refractory material.No matter this liner is that a brick one brick assembles or integrated poured, all contains water and bonding agent.After the oven dry, water and bonding agent occupation space have just become pore, and the porosity is high, and is just low to the erosion-resisting characteristics and the scour resistance of molten steel, and refractory lining just needs thicker, and its thickness is 800mm～900mm.Add that the outer steel frame construction of converter is big, cause the converter overall weight bigger, thereby make that converter rotary electric machine power is huge that ton steel cost is high.After the new converter of China on average refined 300 stoves～400 stove molten steel, liner was just corroded to such an extent that have pit to occur by molten steel, in time repaired in order not make breakdown just the needs.At present, all be 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, the pipe transporting water in outside (promptly to do bonding agent usefulness, play cooling effect again.)。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 ℃; Also have more than 1500 ℃ after pouring out molten steel) 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 the repairing, is the way of having no idea.When existing converter liner need be repaired, generally all need blowing out to cool to below 1200 ℃ and just can repair.Half-dried gun performance parameter is: every repairing once---feed consumption: 5 tons～6 tons; Consuming time: 30 minutes～50 minutes; Steel-making: 3 stoves～4 stoves.This just causes, and steel-making efficient is low, ton steel cost is high, converter furnace life is short, economic loss is big.
Summary of the invention
The purpose of this invention is to provide a kind of flame gunning technological process---the technological process of flame gunning is burnt till molten condition to refractory material exactly and is ejected on the converter liner.Not moisture because of sprayed coating, do not contain bonding agent, so the density of sprayed coating has improved greatly, also just improved 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), bigger, the huge problem that causes ton steel cost to remain high of converter rotary electric machine power of converter overall weight; The another one problem that the present invention solves is that converter needs the blowing out cooling to implement destructive problem of repairing; The 3rd problem that the present invention solves is converter short problem of furnace life.
For realizing goal of the invention, following technical scheme is adopted in flame gunning technological process of the present invention:
The method of the converter liner being carried out integral spray is to operate according to following steps:
(1) preheating: refractory powder is poured in the preheating batch can and is heated to 700 ℃～1500 ℃, and the rotating speed of preheating batch can body is 0～20 rev/min in the heating process;
(2) integral spray: the discharging opening of preheating batch can is connected with the afterbody of spray gun, and with O
2, argon gas, C
2H
2Source of the gas is connected through the corresponding interface of pipeline with the spray gun afterbody.According to spraying operational procedure-open successively O
2, C
2H
2Behind the valve, open the blanking valve again.Utilize C
2H
2Leave about 1.5 meters of 2500 ℃ of flame belt lengths of high temperature of focusing on behind the nozzle, refractory powder is burnt till molten condition after, new converter liner is carried out integral spray.Spraying is closed blanking valve, C after accomplishing successively
2H
2Valve, O
2Valve; And in time open argon gas valve 30 seconds to clean C
2H
2Pipeline.
The method that the converter liner is repaired is to operate according to following steps:
(1) preheating: refractory powder is poured in the preheating batch can and is heated to 700 ℃～1500 ℃, and the rotating speed of preheating batch can body is 0～20 rev/min in the heating process;
(2) the converter liner gives processing: the discharging opening of preheating batch can is connected with the afterbody of spray gun, and with O
2, argon gas, C
2H
2Source of the gas is connected through the corresponding interface of pipeline with the spray gun afterbody.According to repair operation rules-open successively O
2, C
2H
2Behind the valve, utilize acetylene to leave to focus on the high temperature at 2500 ℃ at nozzle back focus place that the converter liner is melted away earlier by one deck slag on molten steel attack sites surface, burn cross recess being etched on the refractory lining that the position exposes out then;
(3) repair: after accomplishing above-mentioned (two) step, in time open the blanking valve and repair.After repairing completion, close blanking valve, C successively
2H
2Valve, O
2Valve; And in time open argon gas valve 30 seconds to clean C
2H
2Pipeline.
Flame gunning technological process of the present invention makes not moisture, as not contain bonding agent Monofrax sprayed coating improve greatly the erosion-resisting characteristics and the scour resistance of molten steel.Because these superior functions; To the converter liner (after original refractory thickness is that 800mm～900mm) integral body is carried out flame-spraying; It is nearly 1/3rd that integral lining thickness will reduce, and adds the outer steel frame construction of converter, and overall weight reduces nearly 1/3rd; Thereby it is nearly 1/3rd that the power of motor that converter is rotated reduces, and finally reaches the purpose that reduces ton steel cost.On the other hand, the temperature in the converter is high more, helps the enforcement of flame gunning more.That is to say, rotate that as long as can reveal the position of being corroded by molten steel, flame gunning technological process of the present invention just can be implemented to repair, thereby has improved steel-making efficient greatly, has obtained bigger economic benefit under the condition of not blowing out steel-making through converter.
The specific embodiment
The flame gunning process chart is shown in accompanying drawing:
Embodiment one
Flame gunning technology, the method for the converter liner being carried out integral spray is to operate according to following steps:
(1) preheating: refractory powder is poured in the preheating batch can and is heated to 700 ℃～1500 ℃, and the rotating speed of preheating batch can body is 0～20 rev/min in the heating process;
(2) integral spray: the discharging opening of preheating batch can is connected with the afterbody of spray gun, and with O
2, argon gas, C
2H
2Source of the gas is connected through the corresponding interface of pipeline with the spray gun afterbody.According to spraying operational procedure-open successively O
2, C
2H
2Behind the valve, open the blanking valve again.Utilize C
2H
2Leave about 1.5 meters of 2500 ℃ of flame belt lengths of high temperature of focusing on behind the nozzle, refractory powder is burnt till molten condition after, new converter liner is carried out integral spray.Spraying is closed blanking valve, C after accomplishing successively
2H
2Valve, O
2Valve; And in time open argon gas valve 30 seconds to clean C
2H
2Pipeline.
Embodiment two
The method that the converter liner is repaired is to operate according to following steps:
(1) preheating: refractory powder is poured in the preheating batch can and is heated to 700 ℃～1500 ℃, and the rotating speed of preheating batch can body is 0～20 rev/min in the heating process;
(2) the converter liner gives processing: the discharging opening of preheating batch can is connected with the afterbody of spray gun, and with O
2, argon gas, C
2H
2Source of the gas is connected through the corresponding interface of pipeline with the spray gun afterbody.According to repair operation rules-open successively O
2, C
2H
2Behind the valve, utilize acetylene to leave to focus on the high temperature at 2500 ℃ at nozzle back focus place that the converter liner is melted away earlier by one deck slag on molten steel attack sites surface, burn cross recess being etched on the refractory lining that the position exposes out then;
(3) repair: after accomplishing above-mentioned (two) step, in time open the blanking valve and repair.After repairing completion, close blanking valve, C successively
2H
2Valve, O
2Valve; And in time open argon gas valve 30 seconds to clean C
2H
2Pipeline.
Concrete operation method of the present invention is:
(1) preheating batch can: the preheating batch can is heated to 700 ℃～1500 ℃ to refractory material earlier before spray repair, and the refractory powder of different formulations can heat the interior different temperature points of temperature section so far.The average fusing point of refractory powder is 2000 ℃, can be only having the refractory powder about 600 ℃ to burn till molten condition apart from fusing point through 2500 ℃ thermal-flame bands.After treating that the spray repair layer solidifies, moisture because of it, do not contain binding agent, the density of spray repair layer has not improved greatly, and the spray repair layer has improved the erosion-resisting characteristics and the scour resistance of molten steel greatly.Because these superior functions; To the converter liner (after existing refractory lining thickness is that 800mm～900mm) integral body is carried out flame-spraying; Integral lining thickness will reduce nearly 1/3rd; Thereupon the outer steel frame construction weight of converter reduce nearly 1/3rd, nearly 1/3rd thereby the power of motor that converter is rotated reduces, finally reach the purpose that reduces ton steel cost.On the other hand, the temperature in the converter is high more, helps the enforcement of flame gunning more.That is to say, rotate that as long as can reveal the position of being corroded by molten steel, flame gunning just can be implemented to repair, thereby has improved steel-making efficient greatly under the condition of not blowing out steel-making through converter.
(2) spray tip: the gas through this structure nozzle can be realized focusing on leaving a certain designed distance place, nozzle the place ahead, thereby reaches focusing effect.That is to say that inflammable gas temperature after leaving nozzle is increasingly high, the temperature of along can reach about 2500 ℃.So high temperature band can be fully is average fusing point that 2000 ℃ refractory material burns till molten condition; Also can be prone to realize three steps of flame gunning: 1. melted away the converter liner earlier by one deck slag on molten steel attack sites surface; 2. burn " ten " word groove being etched on the refractory lining that the position exposes out; 3. burning till molten condition to refractory powder is ejected into and is etched the position.
The flame gunning machine performance parameter is repaired once, and is consuming time: 25 minutes-30 minutes; Feed consumption: 0.8 ton-1.2 tons; Steel-making: 20 stoves-30 stove.
(3) work engineering: the refractory powder in the preheating batch can was warming up to 700 ℃～1500 ℃ needs 50 minutes～80 minutes from normal temperature.That is to say that before 50 minutes～80 minutes before the converter liner need be repaired, the preheating batch can will start in advance, operate according to preheating batch can capability operation rules.
Preheating batch can operational procedure is seen the preheating batch can of flame gunning artwork:
1, pours refractory powder in the batch can 2 into, then cover lid and stepping up;
2, push away smoke evacuation gatherer 1 to the right, the right import of smoke evacuation gatherer 1 is docked with outlet flue on batch can 2 lids, locate by position-sensing switch;
3, connect inflammable gas air inlet 8 and lighting;
4, open motor 3 switches, the gear ring 9 that the driving gear 5 on the motor is driven on the batch can 2 begins rotation;
5, after the refractory powder temperature reaches design temperature in the batch can 2, break off easy fuel gas source, lay down the parts on the air inlet 8, on air inlet 8 (being discharging opening), install the discharging valve;
6, open position-sensing switch, also locate smoke evacuation gatherer 1 to desired location to left translation;
7, open hydraulic cylinder 6, rise to batch can 2 center lines with level along axle 7 and become the α angle position to get final product.
8, specification requirement; 1.40 °＜α＜85 °; The clean container V of batch can inner chamber (rice
3) 0.5＜V＜8; The batch can rotation speed n (rev/min) 0＜n＜20; Cavity temperature is 700 ℃～1500 ℃ in the batch can.
9, treat that the refractory powder in the preheating batch can is heated to design temperature; Its discharging opening is with after the spray gun afterbody connects; Move before converter by the electric control system controls chassis; And detect by the infrared detecting device on the spray gun and to move spray gun when the converter liner is etched the position, spray tip is aimed at be etched the position, spray gunning refractory---open O earlier
2Valve is opened C again
2H
2Valve is opened preheating batch can blanking valve after operation is normal.After treating that infrared detecting device detects the spray repair completion, close the blanking valve earlier, close C again
2H
2Valve is closed the O2 valve at last, and will in time open argon gas valve 30 seconds with flushing C
2H
2Residual gas in the pipeline is closed the argon gas valve after 30 seconds.Keep in the center by the electric control system controls chassis.
Above embodiment is the more preferably specific embodiment a kind of of the present invention, and common variation that those skilled in the art carry out in present technique scheme scope and replacement should be included in protection scope of the present invention.
Claims (3)
1. flame gunning technology is characterized in that, the method for the converter liner being carried out integral spray is to operate according to following steps:
(1) preheating: refractory powder is poured in the preheating batch can and is heated to 700 ℃～1500 ℃.The rotating speed of preheating batch can body is 0～20 rev/min in the heating process; After heating was accomplished, the center line of preheating batch can body can rise to level and become 40 °～85 °.
(2) integral spray: the discharging opening of preheating batch can is connected with the afterbody of spray gun, and with O
2, argon gas, C
2H
2Source of the gas is connected through the corresponding interface of pipeline with the spray gun afterbody.According to spraying operational procedure-open successively O
2, C
2H
2Behind the valve, open the blanking valve again.Utilize C
2H
2Leave 1.5 meters of 2500 ℃ of flame belt lengths of high temperature of focusing on behind the nozzle, refractory powder is burnt till molten condition after, new converter liner is carried out integral spray.Spraying is closed blanking valve, C after accomplishing successively
2H
2Valve, O
2Valve; And in time open argon gas valve 30 seconds to clean C
2H
2Pipeline.
2. flame gunning technology is characterized in that, the method that the converter liner is repaired is to operate according to following steps:
(1) preheating: refractory powder is poured in the preheating batch can and is heated to 700 ℃～1500 ℃, and in the heating process, the rotating speed of preheating batch can body is 0～20 rev/min;
(2) the converter liner gives processing: the discharging opening of preheating batch can is connected with the afterbody of spray gun, and with O
2, argon gas, C
2H
2Source of the gas is connected through the corresponding interface of pipeline with the spray gun afterbody.According to repair operation rules-open successively O
2, C
2H
2Behind the valve, utilize C
2H
2Leave the high temperature that focuses on 2500 ℃ at nozzle back focus place the converter liner is melted away earlier by one deck slag on surface, molten steel attack sites place, be etched on the refractory lining that the position exposes out at the converter liner again and burn cross recess;
(3) repair: after accomplishing above-mentioned (two) step, open the blanking valve and repair.After repairing completion, close blanking valve, C successively
2H
2Valve, O
2Valve; And in time open argon gas valve 20 seconds to clean C
2H
2Pipeline.
3. flame gunning technology is characterized in that, O
2, C
2H
2Locate to realize to focus on through a certain setpoint distance (0.8 meter～2.0 meters) after focusing on nozzle, the along temperature can reach more than 2500 ℃.Thereby reach the purpose of scorification refractory powder.
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 true CN102735060A (en) | 2012-10-17 |
| CN102735060B 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 |
|---|---|
| CN102735060B (en) | 2014-10-29 |
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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 |
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Granted publication date: 20141029 Termination date: 20210406 |
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| CF01 | Termination of patent right due to non-payment of annual fee |