CN118222782A - Furnace wall oxygen burning gun of hard oxygen smelting reverse rotational flow atomized air preheating type electric arc furnace - Google Patents
Furnace wall oxygen burning gun of hard oxygen smelting reverse rotational flow atomized air preheating type electric arc furnace Download PDFInfo
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- CN118222782A CN118222782A CN202410512570.2A CN202410512570A CN118222782A CN 118222782 A CN118222782 A CN 118222782A CN 202410512570 A CN202410512570 A CN 202410512570A CN 118222782 A CN118222782 A CN 118222782A
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- 239000001301 oxygen Substances 0.000 title claims abstract description 249
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 249
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 248
- 238000003723 Smelting Methods 0.000 title claims abstract description 34
- 238000010891 electric arc Methods 0.000 title claims abstract description 19
- 238000002485 combustion reaction Methods 0.000 claims abstract description 97
- 239000000498 cooling water Substances 0.000 claims abstract description 22
- 239000002918 waste heat Substances 0.000 claims abstract description 19
- 239000011229 interlayer Substances 0.000 claims abstract description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 15
- 238000005507 spraying Methods 0.000 claims abstract description 13
- 238000009434 installation Methods 0.000 claims abstract description 5
- 238000000889 atomisation Methods 0.000 claims description 10
- 210000004907 gland Anatomy 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 239000010410 layer Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 35
- 239000010959 steel Substances 0.000 abstract description 35
- 238000002844 melting Methods 0.000 abstract description 9
- 230000008018 melting Effects 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 9
- 238000004904 shortening Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 29
- 239000007789 gas Substances 0.000 description 26
- 238000004519 manufacturing process Methods 0.000 description 10
- 239000000446 fuel Substances 0.000 description 8
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 238000007664 blowing Methods 0.000 description 6
- 239000002737 fuel gas Substances 0.000 description 6
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 6
- 239000002699 waste material Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000005261 decarburization Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008676 import Effects 0.000 description 3
- 238000011112 process operation Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 101100009348 Mus musculus Depp1 gene Proteins 0.000 description 1
- 101100009350 Rattus norvegicus Depp gene Proteins 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- -1 starting the burner Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention relates to a furnace wall oxygen burning gun of a hard oxygen smelting reverse rotational flow atomizing air preheating type electric arc furnace, belonging to the technical field of electric arc furnaces in the metallurgical industry. The technical proposal is as follows: the oxygen lance outer shell (9) is fixedly connected with the combustion chamber outer shell (13), a combustion chamber cooling water interlayer (15) is arranged between the combustion chamber outer shell (13) and the combustion chamber inner shell (14), and a hard oxygen split ring pipe (19) is fixed on the combustion chamber outer shell (13); the compressed air pipe type waste heat preheater (23) is welded with the oxygen lance installation fixing plate (24) and the compressed air inlet pipe (21) to form an integral combustion air system, and the carbon spraying gun (30) is annularly and uniformly distributed on the combustion chamber shell (13) between the oxygen lance shell (9) and the hard oxygen diversion ring pipe (19) at the installation position. The beneficial effects of the invention are as follows: the method can realize a plurality of modes of preheating the scrap steel, shortening the melting time of the scrap steel and the like, thereby shortening the smelting period and reducing the energy consumption.
Description
Technical Field
The invention relates to a hard oxygen smelting reverse rotational flow atomizing air preheating type arc furnace wall oxygen burning gun, and belongs to the technical field of arc furnace wall oxygen burning guns in the metallurgical industry.
Background
The oxygen burning guns currently in use in the electric furnace smelting industry have the following disadvantages. The oxygen burning gun used in industry has no capability of injecting carbon and oxygen into the furnace at the same time due to the technical limitation of structural design, and the oxygen amount injected into the electric furnace is limited due to the small volume of the combustion chamber, so that the oxygen burning gun cannot replace the furnace door carbon oxygen gun; when full scrap steel is smelted, the large amount of scrap steel in the furnace can influence the combustion space of the oxygen burning gun and the release of heat load, and the amount of added scrap steel is limited in each furnace; oxygen is fed through the combustion chamber of the oxygen lance where a high temperature zone is formed, the life of the oxygen lance being affected; the fuel atomization and mixing technology has no obvious breakthrough; the recovery of the waste heat of the cooling water and the waste heat of the furnace wall is blank; after a molten pool is formed in smelting, the impact force of oxygen supplied by an oxygen burning gun on molten steel is limited, and the capabilities of slag breaking, stirring and decarburization cannot completely meet the smelting process requirements; the oxygen enrichment technique capability of combustion air is not provided; and finally, the method does not have any mode of starting the burner, primary air and oxygen enrichment, preheating the scrap steel, starting the burner, oxygen enrichment and hard oxygen, shortening the melting time of the scrap steel, and independently starting the hard oxygen gun mode or the oxygen spraying and carbon spraying mode to replace a furnace door carbon oxygen gun.
Disclosure of Invention
The invention aims to provide an oxygen burning gun for a furnace wall of a hard oxygen smelting reverse rotational flow atomization air preheating type electric arc furnace, which can realize a plurality of modes of preheating scrap steel, shortening the melting time of the scrap steel and the like, thereby shortening the smelting period, reducing the energy consumption and solving the problems in the background technology.
The technical scheme of the invention is as follows:
the utility model provides a reverse whirl atomizing air preheating type electric arc furnace wall oxygen burning torch of hard oxygen smelting, including the nozzle, the primary air kuppe, secondary air swirler oxygen rifle shell, the oxygen rifle combustion chamber, the combustion chamber shell, the combustion chamber inner shell, the combustion chamber cooling water intermediate layer, hard oxygen pipe backup pad, hard oxygen pipe tangential spout, hard oxygen split ring pipe, hard oxygen import pipe, compressed air import pipe, hot compressed air outlet pipe, compressed air pipe formula waste heat pre-heater, oxygen rifle installs the fixed plate, hot compressed air import, the oxygen-enriched pipe, oxygen-enriched control pneumatic valve and spout the carbon rifle, the nozzle inserts in the secondary air kuppe, insert in the oxygen rifle shell behind the fixed secondary air swirler of secondary air kuppe front portion, oxygen rifle shell and the combustion chamber outer shell fixed connection together; the combustion chamber outer shell and the combustion chamber inner shell form a double-layer structure of the oxygen lance combustion chamber, a combustion chamber cooling water interlayer is arranged between the combustion chamber outer shell and the combustion chamber inner shell, and a hard oxygen pipe, a hard oxygen pipe supporting plate and a hard oxygen pipe tangential nozzle connected with the hard oxygen pipe are arranged in the combustion chamber cooling water interlayer; the hard oxygen split ring pipe is fixed on the combustion chamber shell; the compressed air pipe type waste heat preheater is welded with the oxygen lance mounting fixing plate and the compressed air inlet pipe to form an integral combustion air system, the compressed air pipe type waste heat preheater is obliquely welded on the combustion chamber shell, and the hot compressed air outlet pipe is welded on the hot compressed air inlet of the oxygen lance shell; the oxygen-enriched control pneumatic valve is arranged on the oxygen-enriched pipe, one end of the oxygen-enriched pipe is connected with the hot compressed air outlet pipe, and the other end of the oxygen-enriched pipe is connected with the hard oxygen inlet pipe; the carbon spraying gun is annularly and uniformly distributed on the combustion chamber shell between the oxygen gun shell and the hard oxygen diversion ring pipe.
One end of the nozzle is an atomization nozzle, and the outer surface of the nozzle is provided with a primary air guide ring.
The nozzle and the secondary air guide cover are sealed by a red copper gasket.
The nozzle is fixed in the secondary air guide sleeve through the nozzle hexagonal nut gland in a screwing mode.
The hard oxygen pipes are four in annular arrangement.
The hard oxygen diversion ring pipe is semicircular and can cover the pipe orifices of four hard oxygen pipes.
The inclination angle of the compressed air pipe type waste heat preheater is 30 degrees.
The beneficial effects of the invention are as follows:
(1) The water cooling modules can be flexibly arranged according to the size of the electric arc furnace, so that dead angles of a cold area in the furnace are eliminated;
(2) The smelting time is reduced, 80 min+/-20 or lower per furnace can be realized according to different steel types, the productivity is improved, the smelting period is shortened, the power consumption is greatly reduced, and the power is saved by 100 kwh/or more per ton of steel; the cost of the comprehensive ton steel is reduced by about 150 yuan/t steel;
(3) The daily output of molten steel is greatly improved, and the melting time of scrap steel in full scrap steel smelting is obviously reduced;
(4) The flow rate of oxygen, air, fuel gas or oil is widely regulated, and the method is suitable for various smelting steel types and processes;
(5) The back combustion and the backfire of the oxygen flame can be effectively prevented, and the water cooling module is damaged;
(6) The highest hot charged molten iron can reach 70% or 100% of full scrap steel smelting;
(7) The adaptability to the size of the steel scraps in the furnace is stronger;
(8) Starting a burner and oxygen enrichment mode, and preheating scrap steel in advance;
(9) The mode of the hard oxygen and the burner greatly shortens the melting time of the scrap steel;
(10) The coherent jet in the middle smelting stage has stronger stirring effect on a molten pool;
(11) Realizing the whole-course foam slag submerged-arc smelting and improving smelting conditions;
(12) Secondary combustion, fully utilizing chemical energy;
(13) The kinetics of the depp reaction are greatly improved in the early stages of oxidation.
Drawings
FIG. 1 is a front view of the structure of an oxygen lance of the present invention;
FIG. 2 is a cross-sectional view of the oxygen lance of the present invention;
FIG. 3 is a schematic illustration of a gas (oil) nozzle;
FIG. 4 is a schematic view of a primary combustion air pod;
FIG. 5 is a secondary air swirler;
In the figure: the device comprises a nozzle 1, a primary atomization air guide ring 2, a primary atomization air inlet 3, a primary air guide cover 4, a hot air equalizing mixing chamber 5, a secondary air cyclone 6, a primary air circumferential seam nozzle 7, an atomization nozzle 8, an oxygen gun outer shell 9, a nozzle hexagonal nut gland 10, a red copper gasket 11, an oxygen gun combustion chamber 12, a combustion chamber outer shell 13, a combustion chamber inner shell 14, a combustion chamber cooling water interlayer 15, a hard oxygen pipe supporting plate 16, a hard oxygen pipe 17, a hard oxygen pipe tangential nozzle 18, a hard oxygen diversion ring pipe 19, a hard oxygen inlet pipe or carbon spraying pipe 20, a compressed air inlet pipe 21, a hot compressed air outlet pipe 22, a compressed air pipe type waste heat preheater 23, an oxygen gun installation fixing plate 24, a cooling water inlet pipe 25, a cooling water outlet pipe 26, a hot compressed air inlet 27, an oxygen enrichment pipe 28, an oxygen enrichment control pneumatic valve 29 and a carbon spraying gun 30.
Detailed Description
The invention is further illustrated by way of example with reference to the accompanying drawings.
Referring to fig. 1-5, a hard oxygen smelting reverse swirl atomizing air preheating type electric arc furnace wall oxygen burning gun comprises a nozzle 1, a primary air guide cover 4, a secondary air swirler 6, an oxygen gun shell 9, an oxygen gun combustion chamber 12, a combustion chamber shell 13, a combustion chamber inner shell 14, a combustion chamber cooling water interlayer 15, a hard oxygen pipe support plate 16, a hard oxygen pipe 17, a hard oxygen pipe tangential nozzle 18, a hard oxygen split ring pipe 19, a hard oxygen inlet pipe 20, a compressed air inlet pipe 21, a hot compressed air outlet pipe 22, a compressed air pipe type waste heat preheater 23, an oxygen gun mounting fixing plate 24, a hot compressed air inlet 27, an oxygen enrichment pipe 28, an oxygen enrichment control pneumatic valve 29 and a carbon spraying gun 30, wherein the nozzle 1 is inserted into the secondary air guide cover 4, the secondary air swirler 6 is fixed at the front part of the secondary air guide cover 4 and then inserted into the oxygen gun shell 9, and the oxygen gun shell 9 and the combustion chamber shell 13 are fixedly connected together; the combustion chamber outer shell 13 and the combustion chamber inner shell 14 form a double-layer structure of the oxygen lance combustion chamber 12, a combustion chamber cooling water interlayer 15 is arranged between the combustion chamber outer shell 13 and the combustion chamber inner shell 14, and a hard oxygen pipe 17, a hard oxygen pipe supporting plate 16 and a hard oxygen pipe tangential nozzle 18 connected with the hard oxygen pipe 17 are arranged in the combustion chamber cooling water interlayer 15; a hard oxygen split collar 19 is fixed to the combustor casing 13; the compressed air pipe type waste heat preheater 23, the oxygen lance mounting fixing plate 24 and the compressed air inlet pipe 21 are welded together to form an integral combustion air system, the compressed air pipe type waste heat preheater 23 is obliquely welded on the combustion chamber shell 13, and the hot compressed air outlet pipe 22 is welded on the hot compressed air inlet 27 of the oxygen lance shell 9; the oxygen-enriched control pneumatic valve 29 is arranged on the oxygen-enriched pipe 28, one end of the oxygen-enriched pipe 28 is connected with the hot compressed air outlet pipe 22, and the other end is connected with the hard oxygen inlet pipe 20; the carbon spraying gun 30 is annularly and uniformly distributed on the combustion chamber shell 13 between the oxygen gun shell 9 and the hard oxygen diversion ring pipe 19.
In this embodiment, referring to fig. 1-5, the nozzle 1 is a gas (oil) nozzle, one end of the nozzle 1 is an atomizing nozzle 8, and the outer surface of the nozzle 1 is provided with a primary air guide ring 2. The nozzle 1, the primary air guide ring 2 and the atomizing nozzle 8 are inserted into the secondary air guide cover 4, are sealed by red copper gaskets, and are rotationally fixed in the secondary air guide cover 4 by a nozzle hexagonal nut gland 10; the front part of the secondary air guide cover 4 is welded with a secondary air swirler 6 and then integrally inserted into an oxygen lance shell 9, the secondary air swirler 6 and the oxygen lance shell are welded and fixed into a whole, and the outer edge of the secondary air swirler 6 is provided with a millimeter-sized circular seam; the front end of the oxygen lance housing 9 is welded with the combustion chamber housing 13 into a whole.
The cylindrical gas (oil) oxygen lance combustion chamber 12 is formed by welding and assembling a combustion chamber outer shell 13, a combustion chamber inner shell 14 and a combustion chamber cooling water interlayer 15; the four hard oxygen pipes 17 which are welded and fixed in the cooling water interlayer 15 of the combustion chamber by the hard oxygen pipe supporting plate 16 are welded with the hard oxygen pipe supporting plate, and the tangential nozzle 18 of the hard oxygen pipe and the seamless pipe are welded.
A semicircular hard oxygen split collar 19 covering the mouths of four 17 hard oxygen tubes 17 arranged in a ring shape is welded on the combustion chamber housing 13 and is welded with a hard oxygen inlet tube 20.
The compressed air pipe type waste heat preheater 23 formed by three circular pipes is welded with the gas (oil) oxygen lance mounting fixing plate 24 and the compressed air inlet pipe 21 to form an integral combustion air system, and the compressed air pipe type waste heat preheater 23 is welded on the combustion chamber shell 13 in an inclined way by 30 degrees; the hot compressed air outlet pipe 22 is welded to the hot compressed air inlet 29 of the gas (oil) oxygen lance housing 9.
The 29 oxygen-enriched control pneumatic valve is arranged on the 28 oxygen-enriched pipe, one end of the 29 oxygen-enriched pipe is welded with the 22 hot compressed air outlet, and the other end is welded with the 20 hard oxygen inlet pipe.
The four carbon spraying guns 30 are arranged on the combustion chamber shell 13 which is uniformly distributed between the gas (oil) oxygen gun shell 9 and the hard oxygen split ring pipe 19 in a ring shape.
The cooling water pipe of the combustion chamber 12 of the gas (oil) oxygen lance and the interlayer 15 of the cooling water of the combustion chamber is welded on the combustion chamber shell 13 between the hard oxygen diversion ring pipe 19 and the combustion chamber shell 9 of the gas (oil) oxygen lance.
The invention has the following characteristics:
(1) Compared with the traditional oxygen burning gun commonly used in industry, the hard oxygen pipeline is added in the water-cooling interlayer of the combustion chamber, so that the temperature of low-temperature oxygen conveyed from an oxygen generating station outside a factory is raised to some extent, the temperature of oxygen entering the furnace is increased, and meanwhile, the heat of cooling water is absorbed, so that the combustion chamber is better cooled, the burning loss is prevented, the service life of the combustion chamber is indirectly prolonged, and the heat balance effect on the production of an electric arc furnace is better; the hard oxygen nozzle can change the injection angle according to the production requirement during manufacturing, and a Laval pipe type nozzle can be arranged at the front end, so that the oxygen injection speed exceeds the sonic velocity, and after a molten pool is formed during melting and smelting of the scrap steel, the impact force of oxygen supplied by an oxygen burning gun to molten steel and the capabilities of breaking slag, stirring and decarburizing meet the smelting process requirement. In addition, the hard oxygen pipes are arranged in the cooling water interlayer and are in annular arrangement, the number of the hard oxygen pipes can be increased at will, and a certain number of carbon spraying pipes can be expanded and arranged, so that the hard oxygen pipes have the functions of blowing oxygen from the furnace door and spraying carbon to the same carbon-oxygen gun;
(2) Through the two groups of hot compressed air cyclone devices, primary atomization and combustion-supporting air and secondary combustion-supporting air are generated in production to realize reverse cyclone, so that atomized fuel and air are mixed more uniformly, combustion is more complete, and flame length is easier to control;
(3) The tubular air preheater capable of preheating low-temperature compressed air sent by the external network fully recovers heat dissipated by the furnace body, and enables the heat to return to the furnace through a carrier of compressed air, thereby improving the overall heat balance of the electric arc furnace and improving the heat efficiency; the combustion temperature of the fuel gas (oil) oxygen lance can be effectively improved or raised;
(4) The oxygen-enriched pipeline and the automatic control pneumatic valve are added, so that the oxygen content of hot air is improved, the preheating and melting effects on scrap steel in the initial production ignition start and continuous production are obvious, and the oxygen-enriched control pneumatic valve for controlling the oxygen supply can be connected into an automatic operation control system of the integral oxygen burning gun.
(5) The burner, primary air and oxygen enrichment mode can be started at will, and scrap steel can be preheated in advance; the mode of burner, oxygen enrichment and hard oxygen can be started, so that the steel scrap melting time is greatly shortened; the mode of the hard oxygen lance or the mode of oxygen injection and carbon injection can be independently started to replace the carbon oxygen lance of the furnace door.
The process flow of the invention is as follows:
the oxygen burning gun has wide fuel requirement, and can be liquefied gas, natural gas, coke oven gas, converter gas, heavy oil, residual oil and other light oil.
(1) Whatever fuel enters from the front pipeline of the gas (oil) nozzle 1, is accelerated to exceed the sonic velocity through the throat of the gas (oil) atomizing nozzle 8, and the pressure energy is mostly converted into kinetic energy to form high-speed powerful injection, and is atomized and sprayed out from the nozzle;
(2) Compressed air enters the compressed air pipe type waste heat preheater 23 from the compressed air inlet pipe 21 and is preheated and warmed up to primary and secondary combustion-supporting compressed air by waste heat of heat radiation in the furnace and heat transfer of the water cooling wall at the mounting hole and the gap of the oxygen burning gun, the primary combustion-supporting hot compressed air enters the hot air equalizing and mixing chamber 5 from the hot compressed air outlet 22, the gas (oil) oxygen gun inlet connecting pipe and the hot compressed air inlet 27, then enters the interlayer space of the nozzle and the air guiding cover through the primary air guiding cover 4 and the primary atomization air inlet 4, forms clockwise rotating air flow through the primary atomization air guiding ring 2, is sprayed out through the primary air circumferential seam nozzle 7, tangentially collides with the gas (oil) atomized and sprayed out through the diffusion of the nozzle of the gas (oil) nozzle 1, atomizes the gas (oil) again, and uniformly mixes the gas (oil) oxygen gun and ignites and burns in the combustion chamber 12 to form high-temperature flame flow to spray;
(3) The secondary combustion air enters the gas (oil) oxygen lance combustion chamber 12 through the secondary air swirler 6 and the millimeter-sized circumferential seams at the outer edge of the secondary air swirler, so that secondary air flow and primary air flow form reverse rotational flow, the air and materialized fuel are better mixed, the millimeter-sized circumferential seams at the outer edge of the secondary air swirler 6 can play a role of increasing the surplus air quantity in the gas (oil) oxygen lance combustion chamber 12, the combustion is more complete, the utilization rate of chemical energy of the fuel is higher, and the waste steel in the electric arc furnace is preheated and melted quickly by flame flow sprayed out of the combustion chamber;
(4) The hard oxygen enters into the hard oxygen diversion ring pipe 19 from the hard oxygen inlet pipe 20 and is evenly distributed into the four hard oxygen pipes 17, the cooling water in the combustion chamber cooling water interlayer 15 formed by the combustion chamber outer shell 13 and the combustion chamber inner shell 14 is heated and then is sprayed out from the hard oxygen pipe tangential nozzle 18 at a nozzle angle which is specifically designed according to different fuels and different electric arc furnaces, the injection angle of the hard oxygen nozzle can be changed according to production requirements during manufacturing, so that the hard oxygen nozzle has the same function as a top blowing oxygen gun and an independent oxygen gun for blowing oxygen from a furnace door, and before steel scrap stacking, the hard oxygen nozzle meets a high-temperature flame flow which is formed by igniting and burning in the combustion chamber 12 of the gas (oil) oxygen gun to form secondary combustion, quickly melts the preheated steel scrap added into the furnace, and realizes cluster jet oxygen blowing decarburization in smelting and later period. The oxygen-enriched mode of the novel fuel gas (oil) oxygen burning gun is that a hard oxygen inlet pipe 20 is connected by an oxygen-enriched pipe 28, a hot compressed air outlet 22 and a fuel gas (oil) oxygen gun inlet connecting pipe are connected, hard oxygen is mixed into hot air to form oxygen-enriched mixed gas, the oxygen-enriched mixed gas enters a hot air equalizing mixing chamber 5, and enters a fuel gas (oil) oxygen gun combustion chamber 12 through a secondary air cyclone 6 and a primary air circumferential seam nozzle 7, and the oxygen-enriched amount or proportion can be controlled and regulated according to the furnace condition through an oxygen-enriched control pneumatic valve 29;
(5) In addition, a hot compressed air inlet 27 is arranged on the gas (oil) oxygen lance shell 9, the installation of the gas (oil) nozzle 1 is fixed through a nozzle hexagonal nut gland 10, and a red copper gasket 11 is arranged between the gas (oil) nozzle and the nozzle hexagonal nut gland for effective sealing.
The invention has various process operation modes:
(1) The burner, primary air and oxygen-enriched mode is started, and the scrap steel can be preheated in advance
The process operation mode belongs to the process operation mode when the gas (oil) oxygen lance is firstly put into use and the production is started after each charging interval of the furnace is completed. After the ignition is successful, the amount of primary and secondary combustion air is gradually increased, so that the oxygen burning gun forms stable burning flame flow, the amount of fuel and primary and secondary air is gradually increased, and when the length and diffusion angle of the flame flow reach the requirements, oxygen enrichment can be started to improve the flame temperature to preheat the scrap steel.
(2) Burner, oxygen enrichment and hard oxygen mode, and greatly shortens scrap steel melting time
When the waste steel in the furnace gradually rises in temperature and turns red, the oxygen enrichment amount can be increased in time, so that the waste steel is promoted to start to melt, meanwhile, hard oxygen is started, the waste steel is promoted to melt rapidly, and when the waste steel is completely melted and enters a molten pool, the heat load of an oxygen burning gun can be maintained or adjusted according to the smelting process, so that the smelting requirement can be met.
(3) Separate hard oxygen lance mode or carbon oxygen lance mode to replace the furnace door oxygen lance
The novel fuel gas (oil) oxygen lance can also independently open a hard oxygen lance mode to replace a furnace door oxygen lance to perform middle-stage and later-stage smelting or carbon oxygen lance mode, and realize coherent jet oxygen blowing decarburization in the middle-stage and later-stage smelting. The hard oxygen nozzle can change the injection angle according to the production requirement during manufacture, so that the hard oxygen nozzle has the same function as a top-blown oxygen gun and a furnace door oxygen blowing independent oxygen gun.
Claims (7)
1. The utility model provides a reverse whirl atomizing air preheating formula electric arc furnace oven oxygen burning rifle of hard oxygen smelting which characterized in that: the oxygen lance comprises a nozzle (1), a primary air guide sleeve (4), a secondary air cyclone (6), an oxygen lance shell (9), an oxygen lance combustion chamber (12), a combustion chamber shell (13), a combustion chamber inner shell (14), a combustion chamber cooling water interlayer (15), a hard oxygen pipe support plate (16), a hard oxygen pipe (17), a hard oxygen pipe tangential nozzle (18), a hard oxygen diversion ring pipe (19), a hard oxygen inlet pipe (20), a compressed air inlet pipe (21), a hot compressed air outlet pipe (22), a compressed air pipe type waste heat preheater (23), an oxygen lance installation fixing plate (24), a hot compressed air inlet (27), an oxygen enrichment pipe (28), an oxygen enrichment control pneumatic valve (29) and a carbon spraying gun (30), wherein the nozzle (1) is inserted into the secondary air guide sleeve (4), the front part of the secondary air guide sleeve (4) is fixedly inserted into the oxygen lance shell (9), and the oxygen lance shell (9) and the combustion chamber shell (13) are fixedly connected together; the combustion chamber outer shell (13) and the combustion chamber inner shell (14) form a double-layer structure of the oxygen lance combustion chamber (12), a combustion chamber cooling water interlayer (15) is arranged between the combustion chamber outer shell (13) and the combustion chamber inner shell (14), and a hard oxygen pipe (17), a hard oxygen pipe supporting plate (16) and a hard oxygen pipe tangential nozzle (18) connected with the hard oxygen pipe (17) are arranged in the combustion chamber cooling water interlayer (15); the hard oxygen split ring pipe (19) is fixed on the combustion chamber shell (13); the compressed air pipe type waste heat preheater (23) is welded with the oxygen lance mounting fixing plate (24) and the compressed air inlet pipe (21) to form an integral combustion air system, the compressed air pipe type waste heat preheater (23) is obliquely welded on the combustion chamber shell (13), and the hot compressed air outlet pipe (22) is welded on the hot compressed air inlet (27) of the oxygen lance shell (9); the oxygen-enriched control pneumatic valve (29) is arranged on the oxygen-enriched pipe (28), one end of the oxygen-enriched pipe (28) is connected with the hot compressed air outlet pipe (22), and the other end is connected with the hard oxygen inlet pipe (20); the carbon spraying gun (30) is annularly and uniformly distributed on the combustion chamber shell (13) between the oxygen gun shell (9) and the hard oxygen diversion ring pipe (19).
2. A hard oxygen smelting reverse swirl atomizing air preheating type electric arc furnace wall oxygen lance in accordance with claim 1, wherein: one end of the nozzle (1) is an atomization nozzle (8), and the outer surface of the nozzle (1) is provided with a primary air guide ring (2).
3. A hard oxygen smelting reverse swirl atomizing air preheating type electric arc furnace wall oxygen lance in accordance with claim 2, wherein: the nozzle (1) and the secondary air guide sleeve (4) are sealed by a red copper gasket (11).
4. A hard oxygen smelting reverse swirl atomizing air preheating type electric arc furnace wall oxygen lance according to claim 3, wherein: the nozzle (1) is screwed and fixed in the secondary air guide sleeve (4) through a nozzle hexagonal nut gland (10).
5. A hard oxygen smelting reverse swirl atomizing air preheating type electric arc furnace wall oxygen lance in accordance with claim 1, wherein: the hard oxygen pipes (17) are four in annular arrangement.
6. The oxygen burning gun for the furnace wall of the hard oxygen smelting reverse rotational flow atomizing air preheating type electric arc furnace is characterized in that: the hard oxygen diversion ring pipe (19) is semicircular and can cover the pipe orifices of four hard oxygen pipes (17).
7. A hard oxygen smelting reverse swirl atomizing air preheating type electric arc furnace wall oxygen lance in accordance with claim 1, wherein: the inclination angle of the compressed air pipe type waste heat preheater (23) is 30 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410512570.2A CN118222782A (en) | 2024-04-26 | 2024-04-26 | Furnace wall oxygen burning gun of hard oxygen smelting reverse rotational flow atomized air preheating type electric arc furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410512570.2A CN118222782A (en) | 2024-04-26 | 2024-04-26 | Furnace wall oxygen burning gun of hard oxygen smelting reverse rotational flow atomized air preheating type electric arc furnace |
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| CN118222782A true CN118222782A (en) | 2024-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202410512570.2A Pending CN118222782A (en) | 2024-04-26 | 2024-04-26 | Furnace wall oxygen burning gun of hard oxygen smelting reverse rotational flow atomized air preheating type electric arc furnace |
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| CN (1) | CN118222782A (en) |
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