CN210624521U - Refining furnace oxygen combustion gun with functions of backfire prevention and explosion prevention - Google Patents
Refining furnace oxygen combustion gun with functions of backfire prevention and explosion prevention Download PDFInfo
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- CN210624521U CN210624521U CN201920974045.7U CN201920974045U CN210624521U CN 210624521 U CN210624521 U CN 210624521U CN 201920974045 U CN201920974045 U CN 201920974045U CN 210624521 U CN210624521 U CN 210624521U
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Abstract
The utility model discloses a refining furnace oxygen combustion gun with functions of backfire prevention and explosion prevention, which comprises a gun barrel main body and a spray head at the end part of the gun barrel main body, wherein the gun barrel main body is composed of a plurality of layers of sleeves with collinear central lines, the sleeves are a compressed air pipe, an oxygen pipe, a converter gas pipe, a water pipe and an outer pipe from inside to outside in sequence, and three long open fire pipes distributed in a regular triangle are arranged in a clamping cavity between the oxygen pipe and the converter gas pipe; compared with the prior art, the utility model can avoid the phenomenon of backfire and explosion of the oxygen combustion gun at the moment of flameout; the coal gas sprayed by the oxygen burning gun is ensured to be ignited in time, and the explosion phenomenon at the moment of ignition is avoided; the coal gas is subjected to dual combustion supporting through oxygen and compressed air, and the preheating efficiency is improved.
Description
Technical Field
The utility model relates to a ferrous metallurgy technical field, specific theory relates to a refining furnace oxygen fires rifle with anti-backfire explosion-proof function.
Background
The oxygen combustion gun of the refining furnace is mainly used for converting waste steel in the refining furnace, a spray head of the oxygen combustion gun is arranged at the end part of a wall body of the oxygen combustion gun, the periphery of the spray head is of a water cooling structure, and the spray head is cooled by reasonable cooling water.
Middle steel group saddlemountain heat energy research institute limited company has applied for chinese utility model patent in 2015 year 01 month 27, this patent discloses a device for melting incomplete iron in ladle or the iron ladle, residue, include that the oxygen that comprises barrel body and oxygen rifle shower nozzle fires the rifle, the oxygen rifle shower nozzle is fixed at barrel body front end, the barrel body has set gradually central oxygen pipe from inside to outside, the gas pipe, peripheral oxygen pipe, inlayer water pipe and outer water pipe, oxygen rifle shower nozzle and central oxygen pipe, central oxygen spout is established respectively to gas pipe and peripheral oxygen pipe head export department of correspondence, gas spout and peripheral oxygen spout, communicate through oxygen rifle shower nozzle between inlayer water pipe and the outer water pipe.
The device has the functions of an oxygen lance and an oxygen combustion burner, and can simultaneously meet the requirements of melting residual iron and residues in a steel ladle or an iron ladle; the operation is flexible, the working efficiency is high, and the mechanized operation is easy to realize; however, huge potential safety hazards exist in the using process, gas generated by a high-temperature molten pool of the oxygen combustion gun at the moment of flameout easily flows backwards into the inner cavity of the gun barrel main body to cause backfire explosion, and personal injury accidents occur; in addition, the coal gas sprayed by the spray head can not be ignited in time, and the explosion is easy to occur at the moment of ignition.
The patent of the invention is CN201811415012.5, which is applied by Jiangsu Bi Rui Chi science and technology Co., Ltd in 2018, 11 and 26.A converter oxygen combustion gun with two functions of combustion and oxygen blowing is disclosed, which comprises an inner layer steel pipe, an inner two layer steel pipe, an inner three layer steel pipe, an outer layer steel pipe, a gas spray hole, an oxygen inlet branch pipe, a gas inlet branch pipe, a water return branch pipe and other parts. When scrap steel is pre-melted and preheated: the fuel gas sprayed out of the fuel gas spray holes and part of oxygen sprayed out of the oxygen spray holes are combusted in the converter to generate high heat; during blowing: the oxygen of the main stream sprayed from the oxygen spray holes is used for converting molten steel and steelmaking.
The device generates high heat through combustion of fuel gas and oxygen, so that the loading amount of scrap steel can be greatly increased, and the steel-making cost is reduced; the furnace temperature is high, the slag melting is fast, the steel making time is short, the steel yield is increased, and the steel quality is improved; however, the device supports combustion by using single pure oxygen, sometimes the theoretical combustion temperature of the pure oxygen supporting combustion is higher than the process requirement temperature, and the production requirement cannot be met; furthermore, the device also has the risk of backfire and explosion.
In the prior art, the probability of backfire explosion of the oxygen burner can be reduced only by arranging a specially-assigned person to closely monitor the oxygen pressure, and no substantial solution is provided for backfire explosion prevention, which always troubles the technical personnel in the field, so that a refining furnace oxygen burner with the functions of backfire explosion prevention is needed.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to provide a refining furnace oxygen combustion gun with the functions of backfire prevention and explosion prevention, which can avoid the backfire and explosion phenomenon of the oxygen combustion gun at the flameout moment; the coal gas sprayed by the oxygen burning gun is ensured to be ignited in time, and the explosion phenomenon at the moment of ignition is avoided; the coal gas is subjected to dual combustion supporting through oxygen and compressed air, so that the preheating efficiency is improved; the structure is compact and reasonable, and the lifting and the transverse moving of the whole device are convenient.
For solving the technical problem, the utility model discloses a following technical scheme:
a refining furnace oxygen combustion gun with functions of backfire prevention and explosion prevention comprises a gun barrel main body and a spray head at the end part of the gun barrel main body, wherein the gun barrel main body is composed of a plurality of layers of sleeves with collinear central lines, and the sleeves are sequentially provided with a compressed air pipe, an oxygen pipe, a converter gas pipe, a water pipe and an outer pipe from inside to outside; the spray head comprises a cooling spray head and a gas spray head arranged in the cooling spray head.
Furthermore, three long open fire tubes distributed in a regular triangle are arranged in a clamping cavity between the oxygen tube and the converter gas tube.
Furthermore, four through holes are formed in the cooling spray head, the middle through hole is a conical spray hole, and the rest three through holes are uniformly distributed around the conical spray hole.
Furthermore, one end of the gas nozzle is fixed with the end of the oxygen pipe in an inserting mode, a plurality of convex ribs playing a role in swirling flow are arranged on the outer surface of the gas nozzle, and the surfaces of the convex ribs and the conical spray holes of the cooling nozzle are connected with each other through Morse conicity.
Further, the gas nozzle is a single-hole Laval nozzle.
Furthermore, an oxygen bent pipe, a compressed air bent pipe, an ever-burning fire bent pipe, a converter gas bent pipe, a water inlet bent pipe and a water outlet bent pipe are sequentially arranged on the gun barrel main body; one end of the compressed air bent pipe penetrates through the pipe wall of the oxygen pipe and is communicated with the inner cavity of the compressed air pipe; the ever-open fire bent pipe is communicated with the inner cavity of the ever-open fire pipe through the ever-open fire connecting pipe, the ever-open fire connecting pipe is sleeved on the periphery of the oxygen pipe, and two end parts of the ever-open fire connecting pipe are blocked through welded end covers and flanges.
Further, one end parts of the three long open fire tubes are fixed on the flange; the flange is also provided with a lifting hook.
Further, the cooling spray head is cast from red copper.
The utility model adopts the above technical scheme after, compare with prior art, have following advantage:
the compressed air pipe in the utility model performs air injection work in the whole operation time of the refining furnace, thereby preventing complex gases such as coal gas and the like from entering the inner cavity of the gun barrel main body to cause backfire and explosion;
the long open fire tube of the utility model is used for ensuring that the nozzle can be ignited after spraying coal gas, the ignition is easy, in addition, the burning gas in the refining hearth caused by special reasons in the hearth can be prevented, the danger of deflagration can be generated during the ignition, and the long open fire tube can burn the uncontrollable burning gas at any time;
the utility model has the advantages that the oxygen and the compressed air carry out double combustion supporting on the coal gas, different theoretical combustion temperatures can be realized, and the preheating efficiency is further improved; in the prior art, the preheating time of the oxygen combustion gun to the scrap steel of the 80t refining furnace is 3-4 hours, and the preheating time of the scrap steel in the later 80t refining furnace is compressed to 0.1-1 hour by adopting the utility model, thereby greatly improving the preheating efficiency;
the utility model adopts O-shaped sealing ring between the gas channel and the water inlet channel, and only one welding seam is arranged between the gun barrel main body and the cooling spray head, so that the cooling spray head can be replaced simply by disassembling;
the device has compact and reasonable integral structure, and is convenient for lifting and transverse moving in the smelting process.
The present invention will be described in detail with reference to the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is an enlarged view of section I of the present invention;
FIG. 3 is a left side view of FIG. 1;
FIG. 4 is a view taken in the direction A of FIG. 1;
FIG. 5 is a view from the direction B of FIG. 1;
FIG. 6 is a left side view of the gas shower head of FIG. 2;
in the figure, 1-cooling spray nozzle, 2-gas spray nozzle, 3-outer pipe, 4-water pipe, 5-long open fire pipe, 6-compressed air pipe, 7-oxygen pipe, 8-converter gas pipe, 9-first connecting ring, 10-water outlet connecting pipe, 11-second connecting ring, 12-water inlet connecting pipe, 13-cover plate, 14-flange, 15-long open fire connecting pipe, 16-end cover, 17-nut, 18-elastic cushion, 19-lifting hook, 20-oxygen bent pipe, 21-compressed air bent pipe, 22-long open fire bent pipe, 23-converter gas bent pipe, 24-water inlet bent pipe, 25-water outlet bent pipe and 26-fixing plate.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in fig. 1 and fig. 2, the utility model provides a refining furnace oxygen combustion gun with functions of backfire prevention and explosion prevention, which comprises a gun barrel main body and a nozzle, wherein the nozzle is arranged at the end part of the gun barrel main body; the gun barrel main body is composed of five layers of sleeves, the central lines of the five layers of sleeves are collinear, the five layers of sleeves are sequentially a compressed air pipe 6, an oxygen pipe 7, a converter gas pipe 8, a water pipe 4 and an outer pipe 3 from inside to outside, and rib plates with proper quantity and uniform arrangement are adopted among the five layers of sleeves for reinforcement; three long open fire tubes 5 which are distributed in a regular triangle shape are arranged in a clamping cavity between the oxygen tube 7 and the converter gas tube 8.
As shown in fig. 2, 5 and 6, the nozzle comprises a cooling nozzle 1 and a gas nozzle 2, the cooling nozzle 1 is fixed at the end parts of an outer pipe 3 and a converter gas pipe 8, the cooling nozzle 1 and the outer pipe 3 are fixed in a welding manner, the cooling nozzle 1 and the converter gas pipe 8 are fixed in an insertion manner, and the insertion position is sealed by arranging a plurality of O-shaped sealing rings; the cooling spray head 1 is provided with four through holes, the middle through hole is a conical spray hole, the conical spray hole is used for mixing oxygen and coal gas and spraying out, and the other three through holes are uniformly distributed around the conical spray hole and used for fixing the end part of the ever-burning flame tube 5; the gas spray head 2 is arranged inside the cooling spray head 1 and is fixed with the end part of the oxygen pipe 7 through insertion, a plurality of convex ribs playing a role of rotational flow are arranged on the outer surface of the gas spray head 2, and the surfaces of the convex ribs and the conical spray holes of the cooling spray head 1 are mutually connected through Morse taper; the coal gas nozzle 2 is a single-hole Laval nozzle.
As shown in fig. 1 and fig. 3, an oxygen elbow 20, a compressed air elbow 21, an ever-burning fire elbow 22, a converter gas elbow 23, a water inlet elbow 24 and a water outlet elbow 25 are sequentially mounted on the gun-barrel main body; one end of the oxygen elbow 20 is welded and fixed with one end of the oxygen pipe 7, the inner cavities of the oxygen elbow and the oxygen pipe are communicated, and the other end of the oxygen elbow 20 is arranged on the fixing plate 26; one end of the compressed air bent pipe 21 penetrates through the pipe wall of the oxygen pipe 7 and then is welded and fixed with the compressed air pipe 6, the compressed air bent pipe 21 is communicated with the inner cavity of the compressed air pipe 6, and the other end of the compressed air bent pipe 21 is installed on the fixing plate 26; one end of the ever-burning open fire bent pipe 22 is welded on the pipe wall of the ever-burning open fire connecting pipe 15, the ever-burning open fire bent pipe 22 is communicated with the inner cavity of the ever-burning open fire connecting pipe 15, the ever-burning open fire connecting pipe 15 is sleeved around the oxygen pipe 7, two end parts of the ever-burning open fire connecting pipe 15 are blocked by an end cover 16 and a flange 14 which are welded, the end parts of three ever-burning open fire pipes 5 are fixed on the flange 14, the ever-burning open fire bent pipe 22 is communicated with the inner cavity of the ever-burning open fire pipes 5 by the ever-burning open fire connecting pipe 15, and the other end of; one end of the converter gas elbow 23 is welded on the pipe wall of the converter gas pipe 8, the converter gas elbow 23 is communicated with the inner cavity of the converter gas pipe 8, and the other end of the converter gas elbow 23 is arranged on the fixing plate 26 through a flange plate; one end of the water inlet bent pipe 24 is welded on the pipe wall of the water inlet connecting pipe 12, the water inlet bent pipe 24 is communicated with the inner cavity of the water inlet connecting pipe 12, two end parts of the water inlet connecting pipe 12 are welded and fixed with the second connecting ring 11 through the welded cover plate 13, the second connecting ring 11 is welded on the outer side of the end part of the water pipe 4, and the water inlet bent pipe 24 is communicated with the inner cavity of the water pipe 4 through the water inlet connecting pipe 12; the other end of the water inlet bent pipe 24 is arranged on a fixing plate 26 through a flange plate; one end of the water outlet bent pipe 25 is welded on the pipe wall of the water outlet connecting pipe 10, the water outlet bent pipe 25 is communicated with the inner cavity of the water outlet connecting pipe 10, two end parts of the water outlet connecting pipe 10 are fixed on the second connecting ring 11 and the first connecting ring 9 through welding, the first connecting ring 9 is welded on one end part of the outer pipe 3, and the water outlet bent pipe 25 is communicated with the inner cavity of the outer pipe 3 through the water outlet connecting pipe 10; the other end of the water outlet elbow 25 is mounted on the fixing plate 26 through a flange.
As shown in fig. 1 and 4, a hook 19 is mounted on the barrel body, and both ends of the hook 19 are fixed by a nut 17 and a bullet pad 18 after passing through bolt holes of the flange 14.
The cooling spray nozzle 1 is cast by red copper, and the content of the red copper is more than or equal to 99.85 percent.
After the gun barrel main body is connected with the spray head, the pressure is maintained for 40 minutes through a 2.5Mpa hydraulic test, and the gun barrel is qualified in terms of no leakage.
The compressed air pipe 6 performs air injection operation in the whole operation time of the refining furnace, and prevents complex gases such as coal gas and the like from entering the inner cavity of the gun barrel main body to cause backfire and explosion.
The ever-burning fire tube 5 is ignited in the whole operating time of the refining furnace, so as to ensure that the gas spray head 2 can be ignited after spraying the gas, the ignition is easy, in addition, the danger that the combustion gas exists in the refining hearth due to special reasons and the combustion gas is deflagrated when the ignition is carried out can be prevented, and the ever-burning fire tube 5 can burn the uncontrollable combustion gas.
The utility model provides a when oxygen fires the rifle and is used for 80T refining furnace, concrete use is as following step:
step one, preparation work, wherein the ever-burning fire tube 5 in the oxygen combustion gun is in a continuous ignition state; the compressed air pipe 6 is in a continuous air injection state, and compressed air passes through the end part of the compressed air pipe 6 and sequentially passes through the gas spray head 2 and the cooling spray head 1 to be sprayed out;
opening water inlet and outlet valves of cooling water, wherein the flow rate is 280t/h, the cooling water with the cooling water pressure of more than or equal to 1.2Mpa flows through the water inlet connecting pipe 12 from the water inlet bent pipe 24 and then flows into the inner cavity of the water inlet pipe 4, the cooling water in the inner cavity reversely flows back after passing through the cooling spray head 1, and the cooling water flows out from the outer pipe 3;
step three, opening a coal gas control valve, enabling coal gas with the flow rate of 4000Nm3/h and the pressure of 10000-12000pa to sequentially pass through a converter coal gas elbow 2 and a converter coal gas pipe 8, then pass through a rotational flow convex rib of a coal gas nozzle 2, finally be sprayed out from a conical spray hole of a cooling nozzle 1, and then be ignited by a long bright fire tube 5 after being sprayed out;
opening an oxygen control valve, enabling oxygen with the flow rate of 1400Nm3/h and the oxygen pressure of 0.4Mpa to sequentially pass through an oxygen elbow pipe 20, an oxygen pipe 7 and Laval holes of a gas spray head 2, mixing the oxygen with gas in a conical spray hole of a cooling spray head 1, and spraying the mixture from the end face of the cooling spray head 1, wherein the Mach number of the cooling spray head 1 is 1.6;
and step five, after the flame on the end face of the cooling nozzle 1 is stably combusted, vertically descending the oxygen combustion gun to the upper part of the refining furnace through a lifting device by a lifting hook 19, and starting blowing by the oxygen combustion gun.
The foregoing is illustrative of the best mode of the invention, and details not described herein are within the common general knowledge of a person of ordinary skill in the art. The protection scope of the present invention is subject to the content of the claims, and any equivalent transformation based on the technical teaching of the present invention is also within the protection scope of the present invention.
Claims (8)
1. The utility model provides a refining furnace oxygen fires rifle with prevent tempering and prevent fire explosion function, includes the shower nozzle of barrel main part and barrel main part tip, its characterized in that: the gun barrel main body consists of a plurality of layers of sleeves with collinear central lines, and the sleeves are sequentially provided with a compressed air pipe (6), an oxygen pipe (7), a converter gas pipe (8), a water pipe (4) and an outer pipe (3) from inside to outside; the spray head comprises a cooling spray head (1) and a gas spray head (2) arranged in the cooling spray head.
2. The oxygen combustion gun of the refining furnace with the functions of backfire prevention and explosion prevention as claimed in claim 1, wherein: three long open fire tubes (5) which are distributed in a regular triangle shape are arranged in a clamping cavity between the oxygen tube (7) and the converter gas tube (8).
3. The oxygen combustion gun of the refining furnace with the functions of backfire prevention and explosion prevention as claimed in claim 1, wherein: four through holes are arranged on the cooling spray head (1), the middle through hole is a conical spray hole, and the other three through holes are uniformly distributed around the conical spray hole.
4. The oxygen combustion gun of the refining furnace with the functions of backfire prevention and explosion prevention as claimed in claim 1, wherein: one end of the gas spray nozzle (2) is fixed with the end part of the oxygen pipe (7) through insertion, a plurality of convex ribs playing a role of rotational flow are arranged on the outer surface of the gas spray nozzle (2), and the surfaces of the convex ribs and the conical spray holes of the cooling spray nozzle (1) are connected with each other through Morse taper.
5. The oxygen combustion gun of the refining furnace with the functions of backfire prevention and explosion prevention as claimed in claim 1, wherein: the coal gas nozzle (2) is a single-hole Laval nozzle.
6. The oxygen combustion gun of the refining furnace with the functions of backfire prevention and explosion prevention as claimed in claim 1, wherein: an oxygen bent pipe (20), a compressed air bent pipe (21), an ever-burning flame bent pipe (22), a converter gas bent pipe (23), a water inlet bent pipe (24) and a water outlet bent pipe (25) are sequentially arranged on the gun-barrel main body; one end of the compressed air bent pipe (21) penetrates through the pipe wall of the oxygen pipe (7) and then is communicated with the inner cavity of the compressed air pipe (6); the long open fire elbow (22) is communicated with the inner cavity of the long open fire tube (5) through a long open fire connecting tube (15), the long open fire connecting tube (15) is sleeved around the oxygen tube (7), and two end parts of the long open fire connecting tube (15) are plugged through an end cover (16) and a flange (14) which are welded.
7. The oxygen combustion gun of the refining furnace with the functions of backfire prevention and explosion prevention as claimed in claim 6, wherein: one end parts of the three long open fire tubes (5) are fixed on the flange (14); the flange (14) is also provided with a lifting hook (19).
8. The oxygen combustion gun of the refining furnace with the functions of backfire prevention and explosion prevention as claimed in claim 1, wherein: the cooling spray head (1) is formed by casting red copper.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920974045.7U CN210624521U (en) | 2019-06-26 | 2019-06-26 | Refining furnace oxygen combustion gun with functions of backfire prevention and explosion prevention |
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| CN201920974045.7U CN210624521U (en) | 2019-06-26 | 2019-06-26 | Refining furnace oxygen combustion gun with functions of backfire prevention and explosion prevention |
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| CN210624521U true CN210624521U (en) | 2020-05-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207122A (en) * | 2019-06-26 | 2019-09-06 | 山东崇盛冶金氧枪有限公司 | A kind of refining furnace oxygen lance and its application method for preventing firing function with anti-backfire |
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2019
- 2019-06-26 CN CN201920974045.7U patent/CN210624521U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207122A (en) * | 2019-06-26 | 2019-09-06 | 山东崇盛冶金氧枪有限公司 | A kind of refining furnace oxygen lance and its application method for preventing firing function with anti-backfire |
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