CN111349735B - Treatment method for air leakage and redness of air mixing three-way pipeline of blast furnace hot blast stove - Google Patents
Treatment method for air leakage and redness of air mixing three-way pipeline of blast furnace hot blast stove Download PDFInfo
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- CN111349735B CN111349735B CN201811567721.5A CN201811567721A CN111349735B CN 111349735 B CN111349735 B CN 111349735B CN 201811567721 A CN201811567721 A CN 201811567721A CN 111349735 B CN111349735 B CN 111349735B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/10—Other details, e.g. blast mains
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
The invention belongs to the technical field of steelmaking, and relates to a method for treating air leakage and redness of a blast furnace hot blast stove air mixing three-way pipeline; the method adopts a novel technology of integral replacement of the pipeline and integral casting and forming of the lining, and adopts the method of manufacturing a grinding tool to cast the lining into a whole in a sectional way, so that the possibility of loosening and breakage of the lining under the working condition of high pressure, high temperature and alternating temperature due to the action of heat stress is eliminated, and the common problem that the refractory bricks are easy to break in masonry is thoroughly eliminated. The invention has the characteristics of falling resistance, no need of masonry after breakage, simple maintenance process, obvious effect and the like.
Description
Technical Field
The invention belongs to the technical field of steelmaking, and relates to a method for treating air leakage and redness of a blast furnace hot blast stove air mixing three-way pipeline.
Background
The hot air needed by the blast furnace is mainly conveyed by the hot air furnace through an internal masonry type hot air main pipeline and a hot air surrounding pipe. When the blast furnace is in normal production, the temperature range of hot air conveyed by the hot air pipe is 1040-1210 ℃, and the pressure of the hot air is 170-390 KPa. The hot air pipeline is mostly constructed by building a plurality of layers of refractory brick linings around the inner wall of the steel shell, hot air flows forwards along the axial direction of the inner wall of the brick linings, wind pressure is uniformly directed to the pipe wall along the radial direction, and heat is subjected to certain temperature gradient along the radial direction through refractory bricks. The normal operating conditions should be that the refractory bricks of the same gradient layer are subjected to approximately the same temperature, and the outer steel shell is at a lower temperature and should be approximately the same. When the balance is destroyed, the outer steel shell turns red and runs out, and when the balance is serious, the steel shell bulges, tears and leaks hot air, thereby influencing the safety of the surrounding environment and causing noise hazard, and being forced to stop blowing down and production.
The connection part of the air mixing pipeline and the hot air pipeline is more frequently broken by falling of refractory bricks at the tee joint under the working conditions of high pressure, high temperature and alternating temperature, and the pipeline leaks air, reds and has high failure rate, so that the unplanned blast furnace has a damping down effect. The potential safety hazard of production equipment is formed, and the safety production of the blast furnace is severely restricted.
After an accident, the traditional treatment method is to stop production, the brick-making spare parts are required to be fixed, the spare parts cannot be organized for production when not in time, in addition, the tee joint is required to be built, the building of the intersecting part of the tee joint is difficult, and the like, so that the maintenance time is prolonged by about 2-3 days, and the common problem of possible damage exists after the treatment is finished.
Disclosure of Invention
The invention aims to solve the problems and provide a treatment method for the air leakage and reddening of the air mixing three-way pipeline of the blast furnace hot blast stove, which has the characteristics of falling resistance, no need of masonry after breakage, simple maintenance process, obvious effect and the like.
The purpose of the invention is realized in the following way: a method for treating the red-emitting of air leakage of a blast furnace hot blast stove air mixing three-way pipeline comprises the following specific operations: a) Finding out the damage of refractory bricks in the pipeline through temperature measurement and working experience; b) Measuring the size of a straight section of the air mixing pipeline, prefabricating the straight section of the air mixing pipeline, casting by manufacturing a grinding tool and filling (Al 2O3 is more than 48 percent), and drying; c) Dismantling a damaged pipeline during blast furnace repair; d) The backflow valve is opened to cool the hot air pipeline, and meanwhile, the three-way port is guaranteed to be negative pressure, so that the overhaul is convenient; e) Manufacturing a grinding tool at the tee joint; f) Pouring a tee joint by adopting a blast furnace castable with Al2O3 more than 48 percent; g) The straight section of the air mixing pipeline in the step 2 is butted with a tee joint, the butt joint size is less than 5mm, and a refractory fiber felt is stuffed; the grinding tool comprises a steel pipe A with the thickness delta=12 sleeved outside a steel pipe B with the thickness delta=12, wherein the steel pipe A is welded with a steel pipe round table, the lower part of the steel pipe round table is horizontally welded with a circular steel plate A, the inner ring of the circular steel plate A is welded on the steel pipe B, four rib plates are adopted for reinforcing, the lower end of the steel pipe B is firmly welded with a bent steel pipe, a casting material is used for casting into a combined part A, a vibrating rod is used for jolt ramming, then the steel pipe is baked with small fire, and the baking is carried out to remove crystal water; manufacturing a circular steel plate B at the damaged part of the refractory brick, sleeving the inner ring of the circular steel plate B on a steel pipe C, welding the circular steel plate B with the steel pipe C, and filling casting materials into the steel pipe C to form the assembly B.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of the components of a mold section of the present invention.
Fig. 2 is a schematic view of a mold assembly a according to the present invention.
FIG. 3 is a schematic diagram of the mold portions of the present invention.
Fig. 4 is a schematic view of a mold assembly B according to the present invention.
FIG. 5 is a schematic diagram of the present invention.
Detailed Description
As shown in fig. 1, 2, 3, 4 and 5, the method for treating the red-colored air leakage of the air mixing three-way pipeline of the blast furnace hot blast stove comprises the following specific operations:
the specific repair operation after the partition wall of the internal combustion hot blast stove is damaged is carried out according to the following steps:
a) Finding out the damage of refractory bricks in the pipeline through temperature measurement and working experience;
b) Measuring the size of a straight section of the air mixing pipeline, prefabricating the straight section of the air mixing pipeline, casting by manufacturing a grinding tool and filling (Al 2O3 is more than 48 percent), and drying;
c) Dismantling a damaged pipeline during blast furnace repair;
d) The backflow valve is opened to cool the hot air pipeline, and meanwhile, the three-way port is guaranteed to be negative pressure, so that the overhaul is convenient;
e) Manufacturing a grinding tool at the tee joint;
f) Pouring a tee joint by adopting a blast furnace castable with Al2O3 more than 48 percent;
g) And c, butting the straight section of the air mixing pipeline in the step b with the tee joint, wherein the butt joint size is less than 5mm, and filling the refractory fiber felt.
The grinding tool comprises a steel pipe A1 with the thickness delta=12, which is sleeved outside a steel pipe B2 with the thickness delta=12, the steel pipe A1 is welded with a steel pipe round table 3, the lower part of the steel pipe round table 3 is horizontally welded with a circular steel plate A4, the inner ring of the circular steel plate A4 is welded on the steel pipe B2, four rib plates 5 are adopted for reinforcement, the lower end of the steel pipe B2 is firmly welded with a bent steel pipe 6, a casting material is used for casting into an assembly A7, a vibration rod is used for jolt ramming, and then the steel pipe is baked with small fire, and crystal water is removed after baking; and manufacturing a circular steel plate B8 at the damaged part of the refractory brick, sleeving the inner ring of the circular steel plate B8 on the steel pipe C9, welding the circular steel plate with the steel pipe C9, and filling casting materials into the steel pipe C9 to form an assembly B10.
The invention adopts a novel technology of integral replacement of the pipeline and integral casting molding of the lining, and the grinding tool is manufactured to cast the lining into a whole in a sectional way, so that the possibility of loosening and breakage of the lining under the working condition of high pressure, high temperature and alternating temperature due to the action of heat stress is eliminated, and the common problem that the building of the refractory bricks is easy to break is thoroughly eliminated.
The invention has the characteristics of falling resistance, no need of building after breakage, quick forming of the tee joint of the pipeline, simple overhaul process, obvious effect and the like, and can solve the problem of air leakage and redness of the air mixing tee joint pipeline of the blast furnace hot blast stove in a short time of blast furnace repair.
The method provided by the invention can shorten the maintenance time under the conditions of heavy production tasks and safe production, shortens the process of stopping the blast furnace to restore to normal, and is beneficial to increasing the yield and creating effects.
The invention adopts the method of pouring the blast furnace castable with Al2O3 more than 48 percent, can save the purchase of refractory bricks and save a great amount of funds.
In the practical application process, the method provided by the invention reduces the influence of the reddening and the air leakage of the air mixing pipeline on the blast furnace damping down frequency to zero. Eliminating the harm of scalding and collapsing of personnel, and ensuring the safe production.
Claims (1)
1. A method for treating the air leakage and redness of a blast furnace hot blast stove air mixing three-way pipeline is characterized by comprising the following steps: the method comprises the following specific operations:
a) Finding out the damage of refractory bricks in the pipeline through temperature measurement and working experience;
b) Measuring the size of a straight section of the air mixing pipeline, prefabricating the straight section of the air mixing pipeline, and manufacturing a die and Al 2 O 3 Pouring and drying more than 48% of filler, wherein the die comprises a steel pipe A (1) with the thickness delta=12 sleeved outside a steel pipe B (2) with the thickness delta=12, the steel pipe A (1) is welded with a steel pipe round table (3), the lower part of the steel pipe round table (3) is horizontally welded with a circular ring steel plate A (4), the inner ring of the circular ring steel plate A (4) is welded on the steel pipe B (2), four rib plates (5) are adopted for reinforcement, the lower end of the steel pipe B (2) is firmly welded with a bent steel pipe (6), pouring materials are used for pouring into an assembly A (7), a vibration rod is used for jolt ramming, and then baking is carried out with small fire, and crystallization water is removed by baking;
c) Dismantling a damaged pipeline during blast furnace repair;
d) The backflow valve is opened to cool the hot air pipeline, and meanwhile, the three-way port is guaranteed to be negative pressure, so that the overhaul is convenient;
e) Manufacturing a three-way mold: manufacturing a circular steel plate B (8) at the damaged part of the refractory brick, sleeving the inner ring of the circular steel plate B (8) on a steel pipe C (9) and welding the circular steel plate B with the steel pipe C (9), and filling casting materials into the steel pipe C (9) to form an assembly B (10);
f) By Al 2 O 3 Casting a tee joint by using more than 48% of blast furnace casting materials;
g) And c), butting the straight section of the air mixing pipeline in the step b) with a tee joint, wherein the butt joint size is less than 5mm, and filling the refractory fiber felt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811567721.5A CN111349735B (en) | 2018-12-21 | 2018-12-21 | Treatment method for air leakage and redness of air mixing three-way pipeline of blast furnace hot blast stove |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811567721.5A CN111349735B (en) | 2018-12-21 | 2018-12-21 | Treatment method for air leakage and redness of air mixing three-way pipeline of blast furnace hot blast stove |
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| CN111349735A CN111349735A (en) | 2020-06-30 |
| CN111349735B true CN111349735B (en) | 2023-07-04 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3674167B2 (en) * | 1996-08-01 | 2005-07-20 | Ｊｆｅスチール株式会社 | Hot air pipe repair structure |
| RU2132246C1 (en) * | 1998-06-26 | 1999-06-27 | Селиванов Николай Павлович | Method of manufacturing preforms and products (versions), method of manufacturing cast iron and steel, and method of manufacturing agglomerate |
| CN101899545B (en) * | 2009-05-27 | 2012-08-15 | 五冶集团上海有限公司 | On-line changing method of hot blast main duct of blast furnace |
| JP5510130B2 (en) * | 2010-07-05 | 2014-06-04 | Ｊｆｅスチール株式会社 | Hot air tube replacement method for blast furnace hot air blowing |
| CN102206722B (en) * | 2011-05-11 | 2012-10-17 | 南通宝钢钢铁有限公司 | Quick repair method for fallen hot air pipeline refractory |
| CN103805723B (en) * | 2014-01-28 | 2016-03-02 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Blast-furnace hot-air pipeline transposition section refractory brick comes off quick prosthetic appliance and method |
| CN204174222U (en) * | 2014-11-17 | 2015-02-25 | 中天钢铁集团有限公司 | The repair structure of iron-making heat wind furnace hot air duct and repairing mould thereof |
| CN207313638U (en) * | 2017-08-30 | 2018-05-04 | 宝钢集团新疆八一钢铁有限公司 | A kind of ball-loading device when pebble stove is changed the shuttle |
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