CN111607674A - Method and device for promoting rapid temperature rise of blast furnace hearth - Google Patents
Method and device for promoting rapid temperature rise of blast furnace hearth Download PDFInfo
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- CN111607674A CN111607674A CN202010601186.1A CN202010601186A CN111607674A CN 111607674 A CN111607674 A CN 111607674A CN 202010601186 A CN202010601186 A CN 202010601186A CN 111607674 A CN111607674 A CN 111607674A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000001737 promoting effect Effects 0.000 title claims abstract description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 79
- 239000001301 oxygen Substances 0.000 claims abstract description 79
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 79
- 238000010079 rubber tapping Methods 0.000 claims abstract description 29
- 239000003566 sealing material Substances 0.000 claims abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 96
- 229910052742 iron Inorganic materials 0.000 claims description 48
- 239000002893 slag Substances 0.000 claims description 23
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 239000010963 304 stainless steel Substances 0.000 claims description 4
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 description 12
- 230000008901 benefit Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000000571 coke Substances 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000003912 environmental pollution Methods 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000010009 beating Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/12—Opening or sealing the tap holes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/14—Discharging devices, e.g. for slag
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Blast Furnaces (AREA)
Abstract
The invention relates to the technical field of blast furnaces, in particular to a method and a device for promoting the temperature of a blast furnace hearth to rise quickly, which comprises a sleeve, a low-pressure oxygen connector, a compressed air connector and a tapping machine drill rod tail, wherein the front part of the sleeve extends into the blast furnace hearth from a blast furnace taphole and is filled with sealing materials with the blast furnace taphole, the sleeve comprises an inner sleeve and an outer sleeve, the end parts of the inner sleeve and the outer sleeve are fixedly provided with blind plates for blinding the inner sleeve and the outer sleeve, the low-pressure oxygen connector and the compressed air connector are respectively and fixedly arranged at the rear part of the sleeve and are positioned outside the blast furnace taphole, the low-pressure oxygen connector penetrates through the outer sleeve and extends into the inner sleeve, the compressed air connector extends into a gap between the outer sleeve and the inner sleeve, and the tapping machine. The device and the method provided by the invention can ensure continuous oxygen supply, reduce the consumption of the oxygen steel pipe, realize rapid temperature rise and are environment-friendly.
Description
Technical Field
The invention relates to the technical field of blast furnaces, in particular to a method and a device for promoting a blast furnace hearth to be rapidly heated.
Background
The blast furnace is frequently blown out after the furnace hearth is frozen and sealed for a long time, such as the secondary yield after environmental protection and limited production, the secondary yield after the furnace is sealed in an epidemic situation period, and the like, and the new furnace is blown out, including the furnace blown out after new construction and major and minor maintenance, and particularly, accidents such as freezing or cooling of the furnace hearth cause great loss to various enterprises, and secondary loss is caused by improper treatment or overlong treatment time in the recovery treatment process. In the prior art, when a blast furnace is opened or a treatment furnace hearth is frozen, oxygen is introduced into an oxygen tube with the diameter of 6 minutes (DN20) manually (the oxygen pressure is 0.4 MPa-0.6 MPa), oxygen is gradually burnt into the furnace hearth from an iron notch, cold slag iron is removed, and oxygen is repeatedly burnt. The oxygen pressure is 0.4 MPa-0.6 MPa, oxygen is continuously burnt after the oxygen welding pipe is replaced when the length of the oxygen welding pipe is left to be close to the safe distance, the labor amount is large, the effect is poor, the cost is high, the time is long, and certain pollution is caused to the environment, and the iron notch and the air port are difficult to open frequently, so that the furnace condition is restricted to be quickly recovered, the production cost of an enterprise is increased, and the greater production safety potential hazard is caused, if cold slag iron in a furnace hearth cannot be quickly melted, the iron notch and the blast furnace air port cannot be communicated, slag iron formed by the air port cannot be discharged from the iron notch, the risk of burning out from the air port is caused, and the like. The reason is that the used oxygen pipes are welded pipes made of Q235 materials, and the oxygen pipes are poor in oxidation resistance, low in melting point and the like, so that the oxygen pipes are not resistant to burning, cannot form long-time continuous oxygen burning, and cannot rapidly gather heat.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method and a device for promoting the rapid temperature rise of a blast furnace hearth, which can ensure continuous oxygen supply, reduce the consumption of an oxygen pipe, realize rapid temperature rise and are environment-friendly.
The invention is realized by the following technical scheme:
a method and a device for promoting the rapid temperature rise of a blast furnace hearth comprise a sleeve, a low-pressure oxygen joint, a compressed air joint and a tapping machine shank, wherein the front part of the sleeve extends into the blast furnace hearth from a blast furnace taphole and is filled with a sealing material with the blast furnace taphole, the sleeve comprises an inner sleeve and an outer sleeve sleeved outside the inner sleeve, the end parts of the inner sleeve and the outer sleeve are fixedly provided with blind plates for blinding the inner sleeve and the outer sleeve, the low-pressure oxygen joint and the compressed air joint are respectively and fixedly arranged at the rear part of the sleeve and are positioned outside the blast furnace taphole, the low-pressure oxygen joint penetrates through the outer sleeve and extends into the inner sleeve, the compressed air joint extends into a gap between the outer sleeve and the inner sleeve, and the tapping machine shank is fixedly connected with the rear end part of.
Furthermore, a thermocouple is arranged in a gap between the outer sleeve and the inner sleeve.
Further, the sleeve is made of 304 stainless steel.
Further, the sealing material is water stemming and iron runner ramming material.
A method for promoting the rapid temperature rise of a blast furnace hearth comprises the following process steps:
piling pre-buried stemming in a blast furnace hearth and forming a pre-buried hole;
embedding a sleeve of the device for promoting the rapid temperature rise of the blast furnace hearth at the embedding hole, and filling a sealing material between the sleeve and the tapping channel;
connecting a low-pressure oxygen connector with the oxygen lance through a metal hose, connecting a compressed air connector with a compressed air pipeline, introducing low-pressure oxygen into the inner sleeve, mixing the oxygen and air, igniting and then quickly burning, and introducing compressed air into a gap between the outer sleeve and the inner sleeve to cool the sleeve;
and running for 8-10 hours until the cold iron slag in the furnace hearth is completely melted and automatically removed from the tapping hole.
Further, the buried length of the sleeve is 3 meters.
Furthermore, the outer sleeve is a seamless stainless steel pipe with the diameter phi of 38mm and the length of 4000mm, and the inner sleeve is a seamless stainless steel pipe with the diameter phi of 25mm and the length of 3700 mm.
Further, after the cold iron slag is completely melted after the oxygen is burnt, the tapping machine drill bit shank is sleeved by the tapping machine in front of the furnace, and the sleeve is pulled out from the embedded hole.
Further, after the oxygen is burnt out and the cold iron slag is completely melted, the embedded stemming is sleeved by a steel wire rope, so that the embedded stemming and the sleeve are taken out together.
Furthermore, when the compressed air and the low-pressure oxygen are opened, the air and the low-pressure oxygen are gradually opened from small to large, and the pressure is low in the early stage and high in the later stage.
The invention has the advantages of
The invention provides a method and a device for promoting a blast furnace hearth to be rapidly heated, which are mainly embodied in the aspects of rapidly recovering the furnace condition, reducing the cost, reducing the labor intensity of workers, reducing the environmental pollution and the like, and specifically comprise the following steps:
(1) direct benefit
The method has the advantages that the production is achieved after the blast furnace is normally sealed for a long time by 1000-2000 m3, the time can be shortened from 7 days to 3 days, about 5.0 tons of oxygen pipes can be saved, 200 tons of coke can be saved, the yield of molten iron is increased by 10000 tons, the phi 20mm oxygen welding pipe is calculated according to the unit price of 4500 yuan/ton, the coke is calculated according to 2000 yuan/ton and the profit of the molten iron is calculated according to 150 yuan/ton, and one-time creative benefits are as follows: 5 × 4500+2000 × 200+150 × 10000 ═ 1922500 yuan.
(2) Safety benefits
After the technical scheme is adopted, the channel between the iron notch and the air port can be quickly communicated, so that the safety risk of molten iron burnthrough from the air port is avoided, and accidents are avoided.
(3) Environmental protection benefit
Because the heating and melting are carried out under the condition of being isolated from the atmosphere, the smoke dust generated in the heating process directly enters a coal gas dust removal system and does not directly enter the atmosphere. Therefore, the method plays a good demonstration role in environmental protection.
Drawings
FIG. 1 is a schematic front view of the present invention;
in the figure, 1, a blast furnace hearth, 2, a sealing material, 3, a blast furnace tap hole, 4, a compressed air joint, 5, a low-pressure oxygen joint, 6, an outer sleeve, 7, an inner sleeve, 8, a thermocouple and 9, a tapping machine drill rod tail are shown.
Detailed Description
A method and a device for promoting the rapid temperature rise of a blast furnace hearth comprise a sleeve, a low-pressure oxygen connector 5, a compressed air connector 4 and a tapping machine shank 9, wherein the front part of the sleeve extends into the blast furnace hearth 1 from a blast furnace taphole 3 and is filled with a sealing material 2 with the blast furnace taphole, the sleeve comprises an inner sleeve 7 and an outer sleeve 6 sleeved outside the inner sleeve, blind plates are fixedly arranged at the end parts of the inner sleeve and the outer sleeve to blind the inner sleeve and the outer sleeve, the low-pressure oxygen connector and the compressed air connector are respectively and fixedly arranged at the rear part of the sleeve and are positioned outside the blast furnace taphole, the low-pressure oxygen connector penetrates through the outer sleeve and extends into the inner sleeve, the compressed air connector extends into a gap between the outer sleeve and the inner sleeve, and the tapping machine shank is fixedly connected to the rear end part of the sleeve. The drill bit shank of the tapping machine is mainly characterized in that when a sleeve is inserted into or pulled out of the drill bit shank, the tapping machine with the internal thread inserts or pulls out the sleeve after a tapping pipe is in threaded connection with the drill bit shank of the tapping machine, and time and labor are saved.
Furthermore, the thermocouple 8 is arranged in the gap between the outer sleeve and the inner sleeve, so that whether oxygen is on fire or not and whether the slag iron is automatically burnt through or not can be accurately judged, and the safety problem is effectively solved essentially.
Furthermore, the sleeve is made of 304 stainless steel, so that the oxidation resistance is high, and burnthrough is prevented.
Furthermore, the sealing material is water stemming and iron runner ramming material, has good sealing performance, is economical and practical and is convenient to operate.
A method for promoting the rapid temperature rise of a blast furnace hearth comprises the following process steps:
piling pre-buried stemming in a blast furnace hearth and forming a pre-buried hole;
embedding the sleeve of the device for promoting the rapid temperature rise of the blast furnace hearth at the embedding hole, and filling a sealing material between the sleeve and the tapping channel; the device for promoting the rapid temperature rise of the blast furnace hearth comprises a sleeve, a low-pressure oxygen joint, a compressed air joint and a tapping machine drill shank, wherein stemming is arranged at the bottom in the blast furnace hearth, a sleeve pre-buried hole is arranged at the middle part of the stemming corresponding to a blast furnace taphole, the front part of the sleeve extends into a sleeve embedded hole of the stemming from a blast furnace taphole and is filled with sealing materials between the sleeve embedded hole and a blast furnace taphole, the sleeve comprises an inner sleeve and an outer sleeve sleeved outside the inner sleeve, blind plates are fixedly arranged at the end parts of the inner sleeve and the outer sleeve to blind the inner sleeve and the outer sleeve, the low-pressure oxygen joint and the compressed air joint are respectively and fixedly arranged at the rear part of the sleeve and positioned outside the blast furnace taphole, the low-pressure oxygen joint penetrates through the outer sleeve and extends into the inner sleeve, the compressed air joint extends into a gap between the outer sleeve and the inner sleeve, and the drill bit shank of the tapping machine is fixedly connected to the rear end part of the sleeve and is provided with external threads; a thermocouple is arranged in a gap between the outer sleeve and the inner sleeve; the sleeve is made of 304 stainless steel; the sealing material is water stemming and iron runner ramming material.
Connecting a low-pressure oxygen connector with the oxygen lance through a metal hose and installing a pressure gauge, connecting a compressed air connector with a compressed air pipeline and installing the pressure gauge, introducing low-pressure oxygen into the inner sleeve, mixing the oxygen and air, igniting the mixture, quickly burning the mixture, and introducing compressed air into a gap between the outer sleeve and the inner sleeve to cool the sleeve; the thermocouple is connected with the thermometer, can directly display the temperature in the sleeve, and conveniently and accurately judge whether oxygen is on fire and whether the slag iron is automatically burnt through.
And running for 8-10 hours until the cold iron slag in the furnace hearth is completely melted and automatically removed from the tapping hole. Generally, the cold iron slag can be completely melted in 8-10 hours, and if no molten iron is discharged from the iron outlet after the operation is less than 8-10 hours, the cold iron slag is completely melted, and the oxygen burning can be stopped.
Further, the length of the embedded sleeve is 3 meters, so that tapping and pipe embedding are facilitated.
Furthermore, the outer sleeve is a seamless stainless steel pipe with the diameter phi of 38mm and the length of 4000mm, the inner sleeve is a seamless stainless steel pipe with the diameter phi of 25mm and the length of 3700mm, and the length ratio of the common sleeve is about 1000mm longer than the depth of the taphole.
Further, after the cold iron slag is completely melted after oxygen burning, the tapping machine drill rod is sleeved by the tapping machine in front of the furnace to strip the sleeve out of the embedded hole, the tapping machine can be used for both inserting and stripping, and the device can still be used for subsequent rapid temperature rise after being pulled out, so that the cost is further reduced.
Further, after the oxygen is burnt out and the cold iron slag is completely melted, the embedded stemming is sleeved by a steel wire rope, so that the embedded stemming and the sleeve are taken out together. After the device is pulled out, the pre-buried stemming is broken, and the device can be reserved for subsequent rapid temperature rise for use.
Furthermore, when the compressed air and the low-pressure oxygen are opened, the air and the low-pressure oxygen are gradually opened from small to large, and the pressure is low in the early stage and high in the later stage.
When the hearth rapid heating device is used for processing abnormal furnace conditions of the blast furnace (such as new furnace opening, furnace opening after stewing, furnace cooling, furnace hearth freezing and the like), the rapid heating device is pre-embedded into the blast furnace from an iron notch, and is filled and sealed with water stemming and iron runner ramming materials between the hearth rapid heating device and an iron notch channel, then compressed air and low-pressure oxygen are introduced into the rapid heating device, and the oxygen and the air are mixed and ignited for rapid heating; the compressed air can cool the sleeve, and the sleeve is prevented from being damaged due to overhigh temperature.
In the first concrete implementation mode, when the furnace is newly opened, namely, when no residual iron exists in the furnace hearth, the channel of the iron notch is washed clean by a drill bit with phi 60mm, then oxygen burns red coke, 1 grid of water-bearing stemming or anhydrous stemming is beaten, the gun is directly buried after the gun is retreated, the iron notch is added with the stemming and compacted after the gun is buried, then compressed air and oxygen are opened, the furnace is slowly opened from small to large, the pressure in the lower stage and the higher stage of the pressure in the earlier stage are high, and the gas pressure in the later stage is half an hour: oxygen 0.25MPa and compressed air 0.4MPa, and air leakage cannot occur. When burying the lance, the front end of the oxygen lance is plugged by conical wood. The furnace opening mode can be used for drawing the gun only when the liquid level rises through the taphole.
In the second concrete implementation mode, when the furnace is opened or the furnace hearth is frozen after the furnace is sealed, the iron notch channel is washed clean by the drill bit with the diameter of 60mm, then after the oxygen burns red coke, 1 grid of water stemming or anhydrous stemming is beaten, the gun is directly buried after the gun is retreated, the iron notch is added with the stemming and compacted after being buried, then compressed air and oxygen are opened, the furnace is slowly opened from small to large, the pressure in the lower stage and the higher stage of the pressure in the earlier stage are high, and the gas pressure is half an hour after: oxygen 0.3MPa and compressed air 0.4MPa, and the oxygen lance cannot leak gas, and when the lance is buried, the front end of the oxygen lance is plugged by conical wood.
In a third specific embodiment, the method for embedding the rapid heating device again after pulling out the rapid heating device comprises the following steps: suitable for treating the condition of freezing of the furnace hearth
And after the iron is discharged out, if the channel of the taphole is large, the fluidity of the iron slag is good, and after the taphole is plugged (the mud beating amount can not deepen the taphole and is about 0.5-1 grid), the gun is buried immediately after the gun is withdrawn for 5 minutes.
And B, after the iron is discharged, if the channel of the taphole is small, the fluidity of the iron slag is poor, after the taphole is plugged and the gun is withdrawn, cleaning the iron slag around the taphole, drilling the taphole by using a drill, plugging the taphole immediately, (beating 0.5-1 grid mud), and withdrawing the gun for 5 minutes and burying the gun immediately.
The device and the method ensure continuous oxygen supply and reduce the consumption of the oxygen pipe; the heat loss when the oxygen welding pipe is replaced is avoided, the quick heating device and the iron notch channel are better sealed, no yellow smoke is emitted, and the environmental protection problem is solved. The temperature is raised under the condition of being isolated from the outside atmosphere, and the heat generated by oxygen combustion is completely used for heating the hearth without heat loss and environmental pollution. The method is also the root of the rapid melting of the cold slag iron in the furnace hearth after the rapid heating device is adopted.
Under the normal condition, the compressed air pressure is 0.4-0.5 MPa and the oxygen pressure is 0.25-0.4 MPa, the slag iron can be melted and automatically discharged from the taphole for 8-10 hours, and the slag iron can be repeatedly used until the fluidity of the slag iron is normal and the taphole is normally tapped, so that the aim of safely and quickly recovering the furnace condition is fulfilled. The technology is originated in the blast furnace ironmaking industry, and has profound influence significance and practical significance of reducing cost, improving efficiency, reducing environmental pollution and improving safety production.
In summary, the method and the device for promoting the rapid temperature rise of the blast furnace hearth provided by the invention can ensure continuous oxygen supply and reduce the consumption of the oxygen pipe, and realize rapid temperature rise and environmental protection.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A device for promoting the rapid temperature rise of a blast furnace hearth is characterized by comprising a sleeve, a low-pressure oxygen connector, a compressed air connector and a tapping machine shank, wherein the front part of the sleeve extends into the blast furnace hearth from a blast furnace taphole and is filled with a sealing material with the blast furnace taphole, the sleeve comprises an inner sleeve and an outer sleeve sleeved outside the inner sleeve, the end parts of the inner sleeve and the outer sleeve are fixedly provided with blind plates for blinding the inner sleeve and the outer sleeve, the low-pressure oxygen connector and the compressed air connector are respectively and fixedly arranged at the rear part of the sleeve and are positioned outside the blast furnace taphole, the low-pressure oxygen connector penetrates through the outer sleeve and extends into the inner sleeve, the compressed air connector extends into a gap between the outer sleeve and the inner sleeve, and the tapping machine shank is fixedly connected to the rear end part of the.
2. The apparatus according to claim 1, wherein a thermocouple is provided in a gap between the outer sleeve and the inner sleeve.
3. The apparatus as claimed in claim 1, wherein the sleeve is made of 304 stainless steel.
4. The apparatus according to claim 1, wherein the sealing material is a hydraulic stemming and an iron runner ramming mass.
5. A method for promoting the rapid temperature rise of a blast furnace hearth is characterized by comprising the following process steps:
piling pre-buried stemming in a blast furnace hearth and forming a pre-buried hole;
-embedding a sleeve of the device for promoting the rapid temperature rise of the blast furnace hearth according to any one of claims 1 to 4 at the embedding hole, and filling a sealing material between the sleeve and the tapping channel;
connecting a low-pressure oxygen connector with the oxygen lance through a metal hose, connecting a compressed air connector with a compressed air pipeline, introducing low-pressure oxygen into the inner sleeve, mixing the oxygen and air, igniting and then quickly burning, and introducing compressed air into a gap between the outer sleeve and the inner sleeve to cool the sleeve;
and running for 8-10 hours until the cold iron slag in the furnace hearth is completely melted and automatically removed from the tapping hole.
6. The method for promoting rapid temperature rise of a blast furnace hearth according to claim 5, wherein the buried length of the sleeve is 3 m.
7. The method for promoting the rapid temperature rise of the blast furnace hearth according to the claim 5, wherein the outer sleeve is a seamless stainless steel pipe with the diameter of phi 38mm and the length is 4000mm, and the inner sleeve is a seamless stainless steel pipe with the diameter of phi 25mm and the length is 3700 mm.
8. The method for promoting the rapid temperature rise of the blast furnace hearth according to claim 5, wherein after the oxygen burning is finished and the cold iron slag is completely melted, the sleeve is pulled out from the embedded hole by sleeving a drill bit shank of a tapping machine through a tapping machine in front of the blast furnace.
9. The method as claimed in claim 5, wherein the pre-buried stemming is taken out together with the sleeve by sheathing the pre-buried stemming with a wire rope after the cold iron slag is completely melted after the oxygen is burnt.
10. The method of claim 5, wherein the compressed air and the low-pressure oxygen are gradually turned on from small to large, and the pressure is low at the early stage and high at the later stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010601186.1A CN111607674A (en) | 2020-06-29 | 2020-06-29 | Method and device for promoting rapid temperature rise of blast furnace hearth |
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| CN202010601186.1A CN111607674A (en) | 2020-06-29 | 2020-06-29 | Method and device for promoting rapid temperature rise of blast furnace hearth |
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Cited By (1)
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Application publication date: 20200901 |
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| WD01 | Invention patent application deemed withdrawn after publication |