CN112342328B - Blast furnace reinforced wear-resistant coal gun - Google Patents
Blast furnace reinforced wear-resistant coal gun Download PDFInfo
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- CN112342328B CN112342328B CN202011126521.3A CN202011126521A CN112342328B CN 112342328 B CN112342328 B CN 112342328B CN 202011126521 A CN202011126521 A CN 202011126521A CN 112342328 B CN112342328 B CN 112342328B
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- gun
- gun barrel
- rear end
- coal
- blast furnace
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
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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 discloses a reinforced wear-resistant coal gun for a blast furnace, which comprises a gun barrel rear end and a gun barrel front end, wherein the diameter of the gun barrel front end is smaller than that of the gun barrel rear end, and the gun barrel front end is connected with the gun barrel rear end through a welding seam; a gun valve is arranged at the rear end of the gun tube, the rear end of the gun tube is inserted into the inclined through hole below the fire tube, and the welding line is inserted into the air port of the fire tube; the inner side of the front end of the gun barrel is provided with a wear-resistant ceramic lining; the inclined through hole is a conical tube, and the inner diameter of the inclined through hole at the handle end of the coal gun is larger. The invention can prolong the service life of the coal gun and prevent major blast furnace accidents caused by fire tube burnthrough due to the damage of the coal gun.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a coal gun for injecting pulverized coal into a blast furnace.
Background
In iron and steel production enterprises, coal injection is used as an important process of blast furnace ironmaking, and is an important means for reducing coke ratio and saving cost. In the process of blast furnace ironmaking, a coal gun is an important ironmaking coal injection device. It is installed on the blast furnace air supply device-fire tube for injecting coal into the furnace, and its structural performance directly affects the coke ratio of the blast furnace and the service life of the tuyere.
Because the blast furnace coal powder contains coke powder, the inner wall of the coal gun is easy to wash, the pipe wall of the coal gun is thinned, and finally, the coal gun is abraded and leaked, so that the fire tube is burnt through, accidents are caused, and great safety and hidden production danger are brought to the production of the blast furnace.
Disclosure of Invention
The invention finds out the main reasons of failure by analyzing the on-line use working condition and failure reason of the coal gun: the prior art coal gun is shown in fig. 1 and fig. 2, and is found through inspection: the coal gun is ordinary white steel pipe, and the diameter is 25mm, 3 meters long, and inner wall thickness 4mm changes 20mm in 2.4 meters department diameter, has a weld crater in reducing 600mm department, because buggy weld crater inner wall erodees especially badly, and after the weld crater was erodeed and is opened, the buggy was blown to the inside weakest department of firetube (trident), consumed its wear-resisting material, directly blows the firetube body, breaks open the firetube surface in the twinkling of an eye. If the user regularly stops the wind and replaces the wind, the serious consequences can be caused if the user does not find the wind and the water in time.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a blast furnace reinforced wear-resistant coal gun comprises a gun barrel rear end and a gun barrel front end, wherein the diameter of the gun barrel front end is smaller than that of the gun barrel rear end, and the gun barrel front end is connected with the gun barrel rear end through a welding seam; a gun valve is arranged at the rear end of the gun tube, the rear end of the gun tube is inserted into the inclined through hole below the fire tube, and the welding line is inserted into the air port of the fire tube; the inner side of the front end of the gun barrel is provided with a wear-resistant ceramic lining; the inclined through hole is a conical tube, and the inner diameter of the inclined through hole at the handle end of the coal gun is larger.
The length of the front end of the gun barrel is 200mm, and the length of the rear end of the gun barrel is 2850 mm.
The wall thickness of barrel front end, barrel rear end is 9 mm.
The gun valve is a stainless steel ball valve.
The wear-resistant ceramic lining material is silicon carbide ceramic.
The improved coal gun has the advantages that the on-line average service life is prolonged by nearly 6 times compared with the original service life, the major potential safety hazard is eliminated, the normal production and operation of the blast furnace are ensured, the equipment maintenance cost is reduced, and the effect is obvious.
The invention has the advantages that:
a. redesigning the structural form of a main execution element, namely a coal gun in a blast furnace air supply system, and providing the coal injection equipment which has good service life and solves great potential safety hazard
b. The service life of the coal gun can be prolonged, and the major accidents of the blast furnace caused by the fire tube burning through due to the damage of the coal gun can be avoided;
c. under the system pressure of 1.0MPa, the coke powder with strong scouring capability still has good service performance under the operation of high coal ratio.
d. Simple structure, long service cycle, convenient maintenance and replacement, safety and reliability.
Drawings
FIG. 1 is a schematic size diagram of a prior art coal lance;
FIG. 2 is a schematic view of the position of a coal lance and a burner of the prior art;
FIG. 3 is a schematic size view of a coal lance of the present invention;
FIG. 4 is a schematic view of the position of the coal lance and the burner of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings. The invention comprises a gun barrel rear end 2 and a gun barrel front end 3, wherein the diameter of the gun barrel front end is smaller than that of the gun barrel rear end, and the gun barrel front end is connected with the gun barrel rear end through a welding seam 4; a gun valve 8 is arranged at the rear end of the gun tube, the rear end of the gun tube is inserted into an inclined through hole 10 below the fire tube, and the welding line is inserted into the air port 6 of the fire tube; the inner side of the front end of the gun barrel is provided with a wear-resistant ceramic lining 9. The inclined through hole 10 is a conical tube, the inner diameter of the inclined through hole at the end of the coal gun handle 7 is larger, and the structure ensures that the inner end of the inclined through hole can rotate at a certain angle as a fulcrum, so that the coal gun handle is suitable for different coal injection angle requirements.
The length of the barrel front end 3 is 200mm and the length of the barrel rear end 2 is 2850 mm.
The wall thickness of barrel front end, barrel rear end is 9 mm.
The gun valve 8 is a stainless steel ball valve.
The wear-resistant ceramic lining material is silicon carbide ceramic.
The improved coal gun structure: the gun valve is changed into a stainless steel ball valve, so that the internal heat is good, the gun valve is not easy to deform, and the tightness after the gun valve is closed is strong;
the pipe wall of the coal gun is thickened from original 4mm to 9mm, high-quality carbon steel is adopted, the inner diameter is changed into 14mm, and the coal injection is stable and is not easy to abrade a tuyere; the original 0.6 m weld crater is changed into a stainless steel pipe which is 200mm long and is DN20 welded at 2850mm, and a high-strength wear-resistant ceramic lining is added inside the stainless steel pipe, so that hidden danger points are placed at the farthest position of the coal gun, and the hidden danger points enter the inner diameter of the air opening after being inserted into the fire tube, so that even if the weld crater is washed away, coal powder is directly injected into the inner diameter of the air opening, the fire tube cannot be burnt through due to the fact that the air opening is worn out finally, the inner wall of the coal gun is increased to be 9mm thick, and the wear-resistant strength is greatly increased.
The invention can be applied to all coal injection devices for blast furnace production, and the specific size is determined according to actual conditions.
The invention has the biggest characteristics of simple and practical structure, safety, reliability, adjustable angle, large coal injection amount, strong durability (applicable to the mixture of coal powder and coke powder), no abrasion of a tuyere and capability of ensuring the smooth production and stable production of the blast furnace.
Claims (2)
1. A blast furnace reinforced wear-resistant coal gun comprises a gun barrel rear end and a gun barrel front end, wherein the diameter of the gun barrel front end is smaller than that of the gun barrel rear end, and the gun barrel front end is connected with the gun barrel rear end through a welding seam; set up the rifle valve on the barrel rear end, the barrel rear end inserts in the oblique through-hole of firetube below, its characterized in that: in order to prevent the fire tube from burning through, the welding seam is inserted into the air port of the fire tube; the inner side of the front end of the gun barrel is provided with a wear-resistant ceramic lining; the inclined through hole is a conical tube, and the inner diameter of the inclined through hole at the handle end of the coal gun is larger; the length of the front end of the gun barrel is 200mm, and the length of the rear end of the gun barrel is 2850 mm; the wall thickness of the front end and the rear end of the gun barrel is 9 mm; the gun valve is a stainless steel ball valve.
2. The blast furnace reinforced wear-resistant coal gun of claim 1, wherein: the wear-resistant ceramic lining material is silicon carbide ceramic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011126521.3A CN112342328B (en) | 2020-10-20 | 2020-10-20 | Blast furnace reinforced wear-resistant coal gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011126521.3A CN112342328B (en) | 2020-10-20 | 2020-10-20 | Blast furnace reinforced wear-resistant coal gun |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112342328A CN112342328A (en) | 2021-02-09 |
| CN112342328B true CN112342328B (en) | 2022-04-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011126521.3A Active CN112342328B (en) | 2020-10-20 | 2020-10-20 | Blast furnace reinforced wear-resistant coal gun |
Country Status (1)
| Country | Link |
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| CN (1) | CN112342328B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100797361B1 (en) * | 2001-09-19 | 2008-01-22 | 주식회사 포스코 | A bend pipe device for supplying a fine coal into furnace |
| CN201028509Y (en) * | 2007-04-27 | 2008-02-27 | 陶斌 | Blast furnace supercharging abrasion-proof coal powder injector |
| CN201416008Y (en) * | 2009-05-19 | 2010-03-03 | 范威 | Pulverized coal injector used for injecting pulverized coal into blast furnace |
| CN103131810A (en) * | 2011-11-29 | 2013-06-05 | 张昭贵 | Blast furnace oxygen enrichment coal powder injection device and method off-line assembly and disassembly thereof |
| CN204644386U (en) * | 2015-02-15 | 2015-09-16 | 白耀欢 | Wear-resisting coal spouting gun of pressurization of blast furnace |
| CN104962675A (en) * | 2015-07-07 | 2015-10-07 | 张家港市三和金属材料有限公司 | Wear-resisting blast furnace coal-injection coal lance |
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2020
- 2020-10-20 CN CN202011126521.3A patent/CN112342328B/en active Active
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| CN112342328A (en) | 2021-02-09 |
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