CN116855659A - Hydrogen-rich gas and pulverized coal composite spray gun and spraying method - Google Patents
Hydrogen-rich gas and pulverized coal composite spray gun and spraying method Download PDFInfo
- Publication number
- CN116855659A CN116855659A CN202311010401.0A CN202311010401A CN116855659A CN 116855659 A CN116855659 A CN 116855659A CN 202311010401 A CN202311010401 A CN 202311010401A CN 116855659 A CN116855659 A CN 116855659A
- Authority
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- China
- Prior art keywords
- hydrogen
- coal
- rich gas
- ball valve
- outer sleeve
- 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.)
- Pending
Links
- 239000003245 coal Substances 0.000 title claims abstract description 117
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 100
- 239000007789 gas Substances 0.000 title claims abstract description 92
- 239000001257 hydrogen Substances 0.000 title claims abstract description 92
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 92
- 239000007921 spray Substances 0.000 title claims abstract description 32
- 238000005507 spraying Methods 0.000 title claims abstract description 27
- 239000002131 composite material Substances 0.000 title claims abstract description 15
- 239000007924 injection Substances 0.000 claims abstract description 84
- 238000002347 injection Methods 0.000 claims abstract description 84
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 77
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 37
- 239000000446 fuel Substances 0.000 claims abstract description 20
- 239000000843 powder Substances 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 210000001015 abdomen Anatomy 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims 2
- 239000004449 solid propellant Substances 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000003723 Smelting Methods 0.000 description 3
- 239000002817 coal dust Substances 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/16—Tuyéres
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/16—Tuyéres
- C21B7/163—Blowpipe assembly
-
- 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
- C21B2005/005—Selection or treatment of the reducing gases
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention relates to a hydrogen-rich gas and pulverized coal composite spray gun and a spraying method, and belongs to the technical field of blast furnace tuyere spraying devices in the metallurgical industry. The technical proposal is as follows: the diameter and the length of the outer sleeve (1) are larger than those of the coal injection gun barrel (22), the outer sleeve (1) and the coal injection gun barrel (22) form the same central axis position relation, one end of the outer sleeve (1) is welded with the inlet end of the coal injection gun barrel (22), the other end of the outer sleeve (1) is provided with a mixed fuel outlet (23), the outlet end of the coal injection gun barrel (22) is positioned at the middle part of the outer sleeve (2), and a mixed cavity (12) is formed between the outlet end of the coal injection gun barrel (22) and the mixed fuel outlet (23) of the outer sleeve (1); the hydrogen-rich gas spraying pipe (5) is connected to the outer sleeve (1) near the inlet end of the coal spraying gun barrel (22), and the nitrogen spraying pipe (9) is connected to the hydrogen-rich gas spraying pipe (5). The beneficial effects of the invention are as follows: can make the hydrogen-rich solid fuel fully burn, and is safe and reliable.
Description
Technical Field
The invention relates to a hydrogen-rich gas and pulverized coal composite spray gun and a spraying method, and belongs to the technical field of blast furnace tuyere spraying devices in the metallurgical industry.
Background
Blast furnace ironmaking generally adopts pulverized coal injection or gas fuel injection to replace part of coke so as to reduce the ironmaking coke ratio, and CO can be reduced if hydrogen-rich gas fuel is used 2 And (5) discharging. The hydrogen-rich gas fuel is combusted in front of the tuyere to provide heat and reducing agent for blast furnace smelting, and meanwhile, the reducing process of blast furnace burden can be improved, the development of indirect reduction is promoted, the direct reduction degree is reduced, and further, the fuel consumption of blast furnace smelting can be reduced.
The blowing device capable of blowing the hydrogen-rich gas into the blast furnace comprises a straight pipe insertion type, a sleeve straight pipe insertion type and an integral tuyere.
The straight pipe inserted spray gun has the characteristics of simple structure, long service life and convenient replacement, but for a blast furnace in which hydrogen-rich solid fuel such as coal dust and hydrogen-rich gas are sprayed together, two spray guns are arranged in a limited space of a tuyere sleeve to have the mutual influence, and the coal dust flow is easy to wash the inner wall of the tuyere sleeve.
The sleeve straight pipe inserted spray gun is characterized in that a layer of sleeve is additionally arranged on a gun body of the pulverized coal spray gun, pulverized coal is sprayed in an inner pipe, hydrogen-rich gas is sprayed in a loop between the outer pipe and the inner pipe, the operation that one spray gun sprays pulverized coal and hydrogen-rich gas simultaneously is realized, but the inside of a nozzle of the sleeve straight pipe inserted spray gun is provided with a pulverized coal flow, the outside of the nozzle is provided with the hydrogen-rich gas flow, the outlet end of the pulverized coal spray pipe is contacted with hot air, and is washed by pulverized coal particles sprayed at a high speed, so that the pulverized coal is easy to wear, the service life of the spray gun is limited, the hydrogen-rich gas and the pulverized coal are mutually influenced, the pulverized coal combustion rate is reduced, the content of unburned coal is increased, and the stable and smooth operation of the blast furnace production is further influenced.
The integral spray gun of wind gap is with the whole casting into the wind gap cover of rich hydrogen gas spray gun, has reduced the interference of rich hydrogen gas jetting to the buggy jetting, has realized the high-efficient jetting and the burning of rich hydrogen gas and buggy, but integral spray gun has influenced the inside cooling water course's of wind gap cover structure, has produced adverse effect to the life-span of wind gap cover, can not realize the individual change of rich hydrogen gas spray gun simultaneously, causes the cost of the integral spray gun of wind gap expensive and life low.
Patent 202210687494.X designs a fuel injection method and a composite fuel spray gun for reducing the coking of a blast furnace tuyere, which are characterized in that 4-8 fan-shaped gas channels are arranged along the circumferential direction and are regulated to realize the uniform distribution of hydrogen-rich gas in a tube, so that the spray gun structure is too complex and inconvenient to regulate.
The 202210412295.8 device adopts a sleeve to spray solid fuel inside and gaseous fuel outside, but the gaseous fuel is preferably sprayed with hot air of the blast furnace in a reverse air flow manner, so that the pressure loss at the front end of a tuyere is caused, and the device is unfavorable for smelting the blast furnace.
Therefore, it is necessary to invent a composite spray gun of hydrogen-rich gas and pulverized coal and a spraying method, and the problems are overcome.
Disclosure of Invention
The invention aims to provide a hydrogen-rich gas and pulverized coal composite spray gun and a spraying method, which can fully burn hydrogen-rich solid fuel, are safe and reliable, and solve the problems in the background technology.
The technical scheme of the invention is as follows:
the utility model provides a hydrogen-rich gas and buggy composite spray gun, contains outer tube, hydrogen-rich gas injection tube, nitrogen gas injection tube and coal injection barrel, the diameter and the length of outer tube are greater than the diameter and the length of coal injection barrel, outer tube and coal injection barrel form same center pin positional relationship, outer tube one end welds together with coal injection barrel entry end, the outer tube other end is the mixed fuel export, coal injection barrel exit end is located the outer tube middle part, form the mixing chamber between the mixed fuel export of outer tube to the coal injection barrel exit end; the hydrogen-rich gas spraying pipe is connected to the outer sleeve near the inlet end of the coal spraying gun barrel, and the nitrogen spraying pipe is connected to the hydrogen-rich gas spraying pipe.
The inlet end of the coal injection gun barrel is sequentially connected with a coal injection gun check valve, a coal injection gun ball valve and a coal injection metal hose.
The hydrogen-rich gas spraying pipe is sequentially connected with the hydrogen-rich gas ball valve, the hydrogen-rich gas check valve and the hydrogen-rich gas metal hose.
The nitrogen spraying pipe is sequentially connected with the nitrogen ball valve and the nitrogen metal hose.
The outer sleeve is provided with a flange connected with the tuyere belly pipe.
The method for compositely jetting the hydrogen-rich gas and the coal powder comprises the steps of adopting the composited jet gun of the hydrogen-rich gas and the coal powder, opening a hydrogen-rich gas ball valve and a coal gun ball valve when the hydrogen-rich gas and the coal powder are simultaneously jetted, closing a nitrogen ball valve to ensure that the pressure of the hydrogen-rich gas is higher than the pressure of a coal powder jetting pipe by 100kPa, accelerating the coal powder at the outlet end of a coal jetting gun barrel by the high-speed hydrogen-rich gas in an outer sleeve to form a mixed flow of the hydrogen-rich gas and the coal powder, uniformly mixing the mixed flow in a mixing cavity, and jetting the mixed flow into a furnace through a composited mixed fuel outlet in a diffusion way, so that the combustion effect of the coal jetting is improved;
when only hydrogen-rich gas is injected, the hydrogen-rich gas ball valve is opened, and the nitrogen ball valve and the coal gun ball valve are closed at the same time, so that the pressure of the hydrogen gas is higher than the pressure in the furnace;
when the pulverized coal is injected, the coal gun ball valve is opened, and the nitrogen ball valve and the hydrogen-rich gas ball valve are closed at the same time, so that the injection pressure of the pulverized coal is higher than the pressure in the furnace.
When the injection of the hydrogen-rich gas and the pulverized coal is stopped, a nitrogen ball valve on a nitrogen injection pipe is opened, and the hydrogen-rich gas ball valve and the coal gun ball valve are closed at the same time, so that the nitrogen pressure is higher than the pressure in the furnace.
The beneficial effects of the invention are as follows: the outer sleeve and the coal injection gun barrel form a spray gun barrel body, a half sleeve structure is formed, the injection effect of the hydrogen-rich gas on the outlet medium of the coal injection gun is formed, the uniform mixing of the hydrogen-rich gas and the coal dust is realized, and the combustion effect of the coal injection is improved; the coal injection gun and the hydrogen-rich gas injection pipe are additionally provided with check valves, so that the backflow of high-temperature gas flow is effectively prevented, and the safe injection effect is achieved; when a certain medium is independently sprayed, secondary diffusion can be realized in the mixing cavity, and the spraying uniformity is improved.
Drawings
FIG. 1 is a schematic view of the overall structure of a spray gun;
FIG. 2 is a front view of the lance cartridge;
FIG. 3 is a side view of the lance barrel;
in the figure: 1. an outer sleeve; 2. a coal gun check valve; 3. a coal gun ball valve; 4. coal injection metal hose; 5. a hydrogen-rich gas injection pipe; 6. a hydrogen-rich gas ball valve; 7. a hydrogen-rich gas check valve; 8. a hydrogen-rich gas metal hose; 9. a nitrogen gas injection pipe; 10. a nitrogen ball valve; 11. a nitrogen metal hose; 12. a mixing chamber; 21. a connecting flange; 22. a coal injection gun barrel; 23. and a mixed fuel outlet.
Description of the embodiments
The invention is further illustrated by way of example with reference to the accompanying drawings.
Referring to fig. 1-3, a hydrogen-rich gas and pulverized coal composite spray gun comprises an outer sleeve 1, a hydrogen-rich gas spray pipe 5, a nitrogen spray pipe 9 and a coal injection gun barrel 22, wherein the diameter and the length of the outer sleeve 1 are larger than those of the coal injection gun barrel 22, the outer sleeve 1 and the coal injection gun barrel 22 form the same central axis position relation, one end of the outer sleeve 1 is welded with the inlet end of the coal injection gun barrel 22, the other end of the outer sleeve 1 is a mixed fuel outlet 23, the outlet end of the coal injection gun barrel 22 is positioned in the middle of the outer sleeve 2, and a mixing cavity 12 is formed between the outlet end of the coal injection gun barrel 22 and the mixed fuel outlet 23 of the outer sleeve 1; the hydrogen-rich gas injection pipe 5 is connected to the outer sleeve 1 near the inlet end of the coal injection gun barrel 22, and the nitrogen gas injection pipe 9 is connected to the hydrogen-rich gas injection pipe 5.
In this embodiment, referring to fig. 1-2, the whole half sleeve structure of the spray gun is adopted, and the spray gun comprises an outer sleeve 1, a coal gun check valve 2, a coal gun ball valve 3, a hydrogen-rich gas spraying pipe 5, a hydrogen-rich gas ball valve 6, a hydrogen-rich gas check valve 7, a nitrogen spraying pipe 9, a nitrogen ball valve 10, a connecting flange 21 and a coal injection gun barrel 22, wherein the outer sleeve 1 is made of wear-resistant stainless steel, the outer sleeve 1 and the coal injection gun barrel 22 form the same central axis position relation, the tail part of the outer sleeve 1 is welded with the coal injection gun body in a full-time manner, the outlet of the coal injection gun barrel 22 is positioned at the middle part of the outer sleeve 1, and the outer sleeve 1 is provided with the connecting flange 21 of the air port belly pipe.
The coal injection gun barrel 22 and the hydrogen-rich gas injection pipe 5 are respectively provided with a coal gun check valve 2 and a hydrogen-rich gas check valve 7. A nitrogen injection pipe 9 is arranged in front of the hydrogen-rich gas check valve 7 on the hydrogen-rich gas injection pipe 5, and a nitrogen ball valve 10 is arranged on the nitrogen injection pipe. The coal injection gun barrel 22, the hydrogen-rich gas injection pipe 5 and the nitrogen injection pipe 9 are respectively connected with the injection source thereof through metal hoses.
In a specific application process, the outer sleeve 1 in the invention is connected with the tuyere belly pipe through the connecting flange 21.
When the hydrogen-rich gas and the coal powder are simultaneously injected, the hydrogen-rich gas ball valve 6 and the coal gun ball valve 3 are opened, the nitrogen ball valve 10 is closed, the pressure of the hydrogen-rich gas is higher than the pressure of a coal powder injection pipe by 100kPa, the high-speed hydrogen-rich gas in the outer sleeve 1 accelerates the coal powder at the outlet end of the coal injection gun barrel 22, a mixed flow of the hydrogen-rich gas and the coal powder is formed, the mixed flow is uniformly mixed in the mixing cavity 12, and the mixed flow is sprayed into the furnace through the composite mixed fuel outlet 23 in a dispersing way, so that the combustion effect of the coal injection is improved;
when only hydrogen-rich gas is injected, opening the hydrogen-rich gas ball valve 6, and closing the nitrogen ball valve 10 and the coal gun ball valve 3 at the same time, so that the pressure of the hydrogen gas is higher than the pressure in the furnace;
when the pulverized coal is injected, the coal gun ball valve 3 is opened, and the nitrogen ball valve 10 and the hydrogen-rich gas ball valve 6 are closed at the same time, so that the pulverized coal injection pressure is higher than the furnace pressure.
When the injection of the hydrogen-rich gas and the pulverized coal is stopped at the same time, the nitrogen ball valve 10 on the nitrogen injection pipe 9 is opened, and the hydrogen-rich gas ball valve 6 and the coal gun ball valve 3 are closed at the same time, so that the nitrogen pressure is higher than the furnace pressure.
Claims (7)
1. The utility model provides a compound spray gun of rich hydrogen gas and buggy which characterized in that: the device comprises an outer sleeve (1), a hydrogen-rich gas injection pipe (5), a nitrogen injection pipe (9) and a coal injection gun barrel (22), wherein the diameter and the length of the outer sleeve (1) are larger than those of the coal injection gun barrel (22), the outer sleeve (1) and the coal injection gun barrel (22) form the same central axis position relation, one end of the outer sleeve (1) is welded with the inlet end of the coal injection gun barrel (22), the other end of the outer sleeve (1) is a mixed fuel outlet (23), the outlet end of the coal injection gun barrel (22) is positioned at the middle part of the outer sleeve (2), and a mixed cavity (12) is formed between the outlet end of the coal injection gun barrel (22) and the mixed fuel outlet (23) of the outer sleeve (1); the hydrogen-rich gas spraying pipe (5) is connected to the outer sleeve (1) near the inlet end of the coal spraying gun barrel (22), and the nitrogen spraying pipe (9) is connected to the hydrogen-rich gas spraying pipe (5).
2. The hydrogen-rich gas and pulverized coal composite injection gun according to claim 1, wherein: the inlet end of the coal injection gun barrel (22) is sequentially connected with a coal injection gun check valve (2), a coal injection gun ball valve (3) and a coal injection metal hose (4).
3. A hydrogen-rich gas and pulverized coal composite lance as set forth in claim 2, wherein: the hydrogen-rich gas spraying pipe (5) is sequentially connected with a hydrogen-rich gas ball valve (6), a hydrogen-rich gas check valve (7) and a hydrogen-rich gas metal hose (8).
4. A hydrogen-rich gas and pulverized coal composite lance as set forth in claim 3, wherein: the nitrogen spraying pipe (9) is sequentially connected with a nitrogen ball valve (10) and a nitrogen metal hose (11).
5. The hydrogen-rich gas and pulverized coal composite injection gun according to claim 4, wherein: the outer sleeve (1) is provided with a flange (21) connected with the tuyere belly pipe.
6. A compound injection method of hydrogen-rich gas and coal powder is characterized in that: when the hydrogen-rich gas and the coal powder are simultaneously injected, the hydrogen-rich gas ball valve (6) and the coal gun ball valve (3) are opened, the nitrogen ball valve (10) is closed, the pressure of the hydrogen-rich gas is higher than the pressure of the coal powder injection pipe by 100kPa, the high-speed hydrogen-rich gas in the outer sleeve (1) accelerates the coal powder at the outlet end of the coal injection barrel (22) to form a mixed flow of the hydrogen-rich gas and the coal powder, the mixed flow is uniformly mixed in the mixing cavity (12), and the mixed flow is sprayed into the furnace in a dispersing way through the composite mixed fuel outlet (23), so that the combustion effect of the coal injection is improved;
when only hydrogen-rich gas is injected, the hydrogen-rich gas ball valve (6) is opened, and the nitrogen ball valve (10) and the coal gun ball valve (3) are closed at the same time, so that the pressure of the hydrogen gas is higher than the pressure in the furnace;
when the pulverized coal is injected, the coal gun ball valve (3) is opened, and the nitrogen ball valve (10) and the hydrogen-rich gas ball valve (6) are closed at the same time, so that the pulverized coal injection pressure is higher than the furnace pressure.
7. The method for compositely injecting hydrogen-rich gas and pulverized coal according to claim 6, wherein the method comprises the following steps: when the injection of the hydrogen-rich gas and the pulverized coal is stopped, a nitrogen ball valve (10) on a nitrogen injection pipe (9) is opened, and simultaneously, the hydrogen-rich gas ball valve (6) and the coal gun ball valve (3) are closed, so that the nitrogen pressure is higher than the furnace pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311010401.0A CN116855659A (en) | 2023-08-11 | 2023-08-11 | Hydrogen-rich gas and pulverized coal composite spray gun and spraying method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311010401.0A CN116855659A (en) | 2023-08-11 | 2023-08-11 | Hydrogen-rich gas and pulverized coal composite spray gun and spraying method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116855659A true CN116855659A (en) | 2023-10-10 |
Family
ID=88234257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311010401.0A Pending CN116855659A (en) | 2023-08-11 | 2023-08-11 | Hydrogen-rich gas and pulverized coal composite spray gun and spraying method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116855659A (en) |
-
2023
- 2023-08-11 CN CN202311010401.0A patent/CN116855659A/en active Pending
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