Hard oxygen smelting reverse rotational flow atomization air preheating type electric arc furnace wall oxygen combustion gun

Abstract

The utility model relates to a hard oxygen smelting reverse rotational flow atomization air preheating type electric arc furnace wall oxygen combustion gun, and belongs to the technical field of electric arc furnaces in the metallurgical industry. According to the technical scheme, an oxygen lance outer shell (9) and a combustion chamber outer shell (13) are fixedly connected together, a combustion chamber cooling water interlayer (15) is arranged between the combustion chamber outer shell (13) and a combustion chamber inner shell (14), and a hard oxygen shunting ring pipe (19) is fixed to the combustion chamber outer shell (13); a compressed air pipe type waste heat preheater (23), an oxygen lance installation fixing plate (24) and a compressed air inlet pipe (21) are welded together to form an integral combustion-supporting air system, and carbon spraying guns (30) are annularly and evenly distributed on a combustion chamber shell (13) between an oxygen lance shell (9) and a hard oxygen shunting ring pipe (19). The utility model has the beneficial effects that multiple modes of preheating the scrap steel, shortening the melting time of the scrap steel and the like can be realized, so that the smelting period is shortened, and the energy consumption is greatly reduced.

Description

Technical Field

[0001] The utility model relates to a hard oxygen smelting reverse swirl atomizing air preheating type electric arc furnace wall oxygen combustion gun, belonging to the technical field of electric arc furnace wall oxygen combustion guns in the metallurgical industry. Background Art

[0002] The oxygen-fuel lance currently being used in the electric furnace smelting industry has the following deficiencies. The oxygen-fuel lances used in the industry do not have the ability to simultaneously spray carbon and oxygen into the furnace due to technical limitations in their structural design. In addition, the amount of oxygen sprayed into the electric furnace is limited due to the small volume of the combustion chamber. Therefore, they cannot replace the furnace door carbon-oxygen lance. When all scrap steel is smelted, the amount of scrap steel piled in the furnace is large, which will also affect the combustion space and heat load release of the oxygen-fuel lance, and the amount of scrap steel added to each furnace is limited. Oxygen is supplied through the combustion chamber of the oxygen-fuel lance, where a high-temperature zone is formed, affecting the life of the oxygen-fuel lance. There are no significant breakthroughs in its fuel atomization and mixing technology. There is also a blank in the recovery of waste heat from cooling water and waste heat from furnace walls. After the molten pool is formed during smelting, the impact of oxygen supplied by the oxygen-fuel lance on the molten steel is limited, and the slag breaking, stirring, and decarbonization capabilities cannot fully meet the requirements of the smelting process. None of them have the technical capabilities of enriching the combustion air with oxygen. Finally, they do not have the ability to arbitrarily enable the burner + primary air + oxygen-enriched mode, preheat the scrap steel first, turn on the burner + oxygen-enriched + hard oxygen mode, shorten the melting time of the scrap steel, and enable the hard oxygen-oxygen lance mode or the oxygen spray + carbon spray mode alone to replace the furnace door carbon-oxygen lance. Utility Model Content

[0003] The purpose of the utility model is to provide a hard oxygen smelting reverse swirl atomizing air preheating electric arc furnace wall oxygen combustion gun, which can realize multiple modes such as preheating scrap steel and shortening the melting time of scrap steel, thereby shortening the smelting cycle, reducing energy consumption, and solving the problems existing in the background technology.

[0004] The technical solution of the utility model is:

[0005] A hard oxygen smelting reverse swirl atomizing air preheating type electric arc furnace wall oxygen combustion gun, comprising a nozzle, a primary air guide cover, a secondary air cyclone oxygen gun shell, an oxygen gun combustion chamber, a combustion chamber shell, a combustion chamber inner shell, a combustion chamber cooling water interlayer, a hard oxygen tube support plate, a hard oxygen tube, a hard oxygen tube tangential nozzle, a hard oxygen diversion ring pipe, a hard oxygen inlet pipe, a compressed air inlet pipe, a hot compressed air outlet pipe, a compressed air tube type waste heat preheater, an oxygen gun installation fixing plate, a hot compressed air inlet, an oxygen enrichment pipe, an oxygen enrichment control pneumatic valve and a carbon spray gun, the nozzle is inserted into the secondary air guide cover, the secondary air cyclone is fixed at the front of the secondary air guide cover and then inserted into the oxygen gun shell, the oxygen gun shell and the combustion chamber shell are fixedly connected together; the combustion chamber shell and the combustion chamber inner shell constitute a double layer of the oxygen gun combustion chamber. Structure, a combustion chamber cooling water interlayer is provided between the combustion chamber outer shell and the combustion chamber inner shell, and a hard oxygen pipe, a hard oxygen pipe support plate and a hard oxygen pipe tangential nozzle connected to the hard oxygen pipe are arranged in the combustion chamber cooling water interlayer; the hard oxygen diversion ring pipe is fixed on the combustion chamber outer shell; the compressed air tube type waste heat preheater is welded together with the oxygen gun mounting fixing plate and the compressed air inlet pipe to form an integral combustion-supporting air system, the compressed air tube type waste heat preheater is obliquely welded on the combustion chamber outer shell, and the hot compressed air outlet pipe is welded to the hot compressed air inlet of the oxygen gun outer shell; the oxygen enrichment control pneumatic valve is installed on the oxygen enrichment pipe, one end of the oxygen enrichment pipe is connected to the hot compressed air outlet pipe, and the other end is connected to the hard oxygen inlet pipe; the carbon spray gun is installed in a ring-shaped and evenly distributed position on the combustion chamber outer shell between the oxygen gun outer shell and the hard oxygen diversion ring pipe.

[0006] One end of the nozzle is an atomizing nozzle, and the outer surface of the nozzle is provided with a primary air guide ring.

[0007] The nozzle and the secondary air guide cover are sealed by a copper gasket.

[0008] The nozzle is screwed and fixed in the secondary air guide cover by a nozzle hexagonal nut gland.

[0009] The four hard oxygen pipes are arranged in a ring.

[0010] The hard oxygen flow dividing ring pipe is semicircular and can cover the pipe openings of four hard oxygen pipes.

[0011] The inclination angle of the compressed air tube type waste heat preheater is 30 degrees.

[0012] The beneficial effects of the utility model are:

[0013] (1) The water cooling modules can be flexibly arranged according to the size of the electric arc furnace to eliminate the dead corners in the cold zone of the furnace;

[0014] (2) Reduce smelting time. Depending on the type of steel, each furnace can achieve 80min±20 or less, improve production capacity, shorten smelting cycle, and significantly reduce power consumption. It can save more than 100kwh of electricity per ton of steel; the comprehensive cost per ton of steel can be reduced by about 150 yuan / t of steel;

[0015] (3) Significantly increase the daily output of molten steel and significantly reduce the melting time of scrap steel in all-scrap steel smelting;

[0016] (4) The oxygen, air, gas or oil flow rate can be adjusted widely to adapt to various steel smelting grades and processes;

[0017] (5) It can effectively prevent oxygen flame backfire and reverse combustion from damaging the water cooling module;

[0018] (6) The hot-charging molten iron can reach up to 70% or 100% of full scrap steel smelting;

[0019] (7) It is more adaptable to the size of scrap steel entering the furnace;

[0020] (8) Enable burner + oxygen enrichment mode to preheat scrap steel;

[0021] (9) Hard oxygen + burner mode, which greatly shortens the melting time of scrap steel;

[0022] (10) The jet is concentrated in the middle stage of smelting, which has a stronger stirring effect on the molten pool;

[0023] (11) Realize the whole process of foam slag submerged arc smelting and improve smelting conditions;

[0024] (12) Secondary combustion to fully utilize chemical energy;

[0025] (13) The kinetic conditions of the P removal reaction were greatly improved in the early stage of oxidation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is the front view of the oxygen-fuel gun structure of the utility model;

[0027] Figure 2 This is a cross-sectional view of the oxygen-fuel lance of the utility model;

[0028] Figure 3 This is a schematic diagram of a gas (oil) nozzle;

[0029] Figure 4 This is a schematic diagram of the primary combustion air deflector;

[0030] Figure 5 It is a secondary air cyclone;

[0031] In the figure: nozzle 1, primary atomizing air guide ring 2, primary atomizing air inlet 3, primary air guide cover 4, hot air equalizing mixing chamber 5, secondary air cyclone 6, primary air annular gap nozzle 7, atomizing nozzle 8, oxygen gun shell 9, nozzle hexagonal nut gland 10, copper gasket 11, oxygen gun combustion chamber 12, combustion chamber shell 13, combustion chamber inner shell 14, combustion chamber cooling water interlayer 15, hard oxygen tube support plate 16, hard oxygen tube 17, hard oxygen tube tangential nozzle 18, hard oxygen diversion ring tube 19, hard oxygen inlet pipe or carbon injection pipe 20, compressed air inlet pipe 21, hot compressed air outlet pipe 22, compressed air tubular waste heat preheater 23, oxygen gun mounting plate 24, cooling water inlet pipe 25, cooling water outlet pipe 26, hot compressed air inlet 27, oxygen enrichment pipe 28, oxygen enrichment control pneumatic valve 29, carbon injection gun 30. DETAILED DESCRIPTION

[0032] The present invention will be further described below by way of examples with reference to the accompanying drawings.

[0033] See attached Figure 1-5 A hard oxygen smelting reverse swirl atomizing air preheating type arc furnace wall oxygen combustion gun, comprising a nozzle 1, a primary air guide cover 4, a secondary air cyclone 6, an oxygen gun shell 9, an oxygen gun combustion chamber 12, a combustion chamber shell 13, a combustion chamber shell 14, a combustion chamber cooling water interlayer 15, a hard oxygen tube support plate 16, a hard oxygen tube 17, a hard oxygen tube tangential nozzle 18, a hard oxygen split ring pipe 19, a hard oxygen inlet pipe 20, a compressed air inlet pipe 21, and a hot compressed air outlet pipe 22, compressed air pipe type waste heat preheater 23, oxygen gun mounting fixing plate 24, hot compressed air inlet 27, oxygen enrichment pipe 28, oxygen enrichment control pneumatic valve 29 and carbon spray gun 30, the nozzle 1 is inserted into the secondary air guide cover 4, the secondary air cyclone 6 is fixed at the front of the secondary air guide cover 4 and then inserted into the oxygen gun housing 9, the oxygen gun housing 9 is fixedly connected to the combustion chamber housing 13; the combustion chamber housing 13 and the combustion chamber housing 14 form a double oxygen gun combustion chamber 12 The combustion chamber has a layer structure, a combustion chamber cooling water interlayer 15 is provided between the combustion chamber outer shell 13 and the combustion chamber inner shell 14, and a hard oxygen pipe 17, a hard oxygen pipe support plate 16 and a hard oxygen pipe tangential nozzle 18 connected to the hard oxygen pipe 17 are arranged in the combustion chamber cooling water interlayer 15; the hard oxygen diversion ring pipe 19 is fixed on the combustion chamber outer shell 13; the compressed air tubular waste heat preheater 23 is welded with the oxygen gun mounting fixing plate 24 and the compressed air inlet pipe 21 to form an integral combustion-supporting air system, the compressed air tubular waste heat preheater 23 is welded obliquely on the combustion chamber outer shell 13, and the hot compressed air outlet pipe 22 is welded on the hot compressed air inlet 27 of the oxygen gun outer shell 9; the oxygen enrichment control pneumatic valve 29 is installed on the oxygen enrichment pipe 28, one end of the oxygen enrichment pipe 28 is connected to the hot compressed air outlet pipe 22, and the other end is connected to the hard oxygen inlet pipe 20; the carbon spray gun 30 is installed in a ring-shaped evenly distributed on the combustion chamber outer shell 13 between the oxygen gun outer shell 9 and the hard oxygen diversion ring pipe 19.

[0034] In this embodiment, refer to the attached Figure 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, sealed with a copper gasket, and fixed in the secondary air guide cover 4 by the nozzle hexagonal nut gland 10; the secondary air guide cover 4 is welded with a secondary air cyclone 6 at the front part and then inserted into the oxygen gun housing 9 as a whole, and the two are welded and fixed as one, and the outer edge of the secondary air cyclone 6 has a millimeter-level annular seam; the front end of the oxygen gun housing 9 is welded to the combustion chamber housing 13 as one.

[0035] The cylindrical gas (oil) oxygen gun combustion chamber 12 is welded and assembled by a combustion chamber outer shell 13, a combustion chamber inner shell 14, and a combustion chamber cooling water interlayer 15; four hard oxygen pipes 17 welded and fixed in the combustion chamber cooling water interlayer 15 by a hard oxygen pipe support plate 16, and a hard oxygen pipe tangential nozzle 18 and a seamless pipe are welded.

[0036] A semicircular hard oxygen flow dividing ring pipe 19 covering the pipe openings of the four hard oxygen pipes 17 arranged in an annular manner is welded to the combustion chamber shell 13 and is welded to the hard oxygen inlet pipe 20 .

[0037] The compressed air tubular waste heat preheater 23 composed of three ring pipes is welded with the gas (oil) oxygen gun mounting fixing plate 24 and the compressed air inlet pipe 21 to form an integral combustion-supporting air system. The compressed air tubular waste heat preheater 23 is welded on the combustion chamber shell 13 at an angle of 30 degrees; the hot compressed air outlet pipe 22 is welded on the hot compressed air inlet 29 of the gas (oil) oxygen gun shell 9.

[0038] The oxygen-enriched control pneumatic valve 29 is installed on the oxygen-enriched pipe 28. One end of the oxygen-enriched pipe 29 is welded to the hot compressed air outlet 22, and the other end is welded to the hard oxygen inlet pipe 20.

[0039] The four carbon spray guns 30 are installed in a circular manner and are evenly distributed on the combustion chamber shell 13 between the gas (oil) oxygen gun shell 9 and the hard oxygen diversion ring pipe 19 .

[0040] The cooling water pipes of the combustion chamber 12 of the gas (oil) oxygen gun and the cooling water interlayer 15 of the combustion chamber are welded and installed on the combustion chamber shell 13 between the hard oxygen diversion ring pipe 19 and the gas (oil) oxygen gun shell 9.

[0041] The utility model has the following features:

[0042] (1) Compared with the traditional oxygen-fueled gun commonly used in the industry, a hard oxygen pipe is added to the water-cooled interlayer of the combustion chamber, so that the low-temperature oxygen delivered from the oxygen production station outside the factory is heated up, which not only increases the temperature of the oxygen entering the furnace, but also absorbs the heat of the cooling water, bringing better cooling to the combustion chamber, preventing it from burning, indirectly increasing its service life, and having a better thermal balance effect on the electric arc furnace in production; the hard oxygen nozzle can change its injection angle according to production needs during manufacturing, and a Laffer tube nozzle can be installed at the front end to make the oxygen ejection speed exceed the speed of sound. After the molten pool is formed during the melting and smelting of scrap steel, the impact force of the oxygen supplied by the oxygen-fueled gun on the molten steel and the slag breaking, stirring, and decarbonization capabilities meet the requirements of the smelting process. In addition, the hard oxygen pipe is installed in the cooling water interlayer and arranged in a ring shape. The number can be increased at will. A certain number of carbon spray pipes can also be expanded to make it have the same function as a carbon-oxygen gun for blowing oxygen and spraying carbon at the furnace door;

[0043] (2) Through two sets of hot compressed air swirl devices, the primary atomizing and combustion-supporting air and the secondary combustion-supporting air are generated in the production process, and the two air swirl in opposite directions, so that the atomized fuel and air are mixed more evenly, the combustion is more complete, and the flame length is easier to control;

[0044] (3) The tubular air preheater can preheat the low-temperature compressed air sent from the external network, fully recover the heat lost by the furnace body, and return it to the furnace through the carrier of compressed air, thereby improving the overall thermal balance of the electric arc furnace and improving thermal efficiency; it can also effectively improve or increase the combustion temperature of the gas (oil) oxygen gun;

[0045] (4) Add oxygen-enriched pipes and automatic control pneumatic valves to increase the oxygen content of hot air, which has a significant effect on the initial production ignition startup and the preheating and melting of scrap steel in continuous production. The oxygen-enriched control pneumatic valve that controls the oxygen supply can be connected to the overall oxygen-burning gun automatic operation control system.

[0046] (5) The burner + primary air + oxygen-enriched mode can be activated at will to preheat the scrap steel; the burner + oxygen-enriched + hard oxygen mode can also be activated to significantly shorten the melting time of the scrap steel; the hard oxygen lance mode or oxygen injection + carbon injection mode can also be selected to replace the furnace door carbon oxygen lance.

[0047] The process flow of this utility model is as follows:

[0048] The oxygen-fuel gun has very broad requirements for fuel, which can be liquefied gas, natural gas, even coke oven gas, converter gas, or heavy oil, residual oil, and other light oils.

[0049] (1) Regardless of the type of fuel, it enters from the front pipe of the gas (oil) nozzle 1, is accelerated to a speed exceeding the speed of sound at the throat of the gas (oil) atomizing nozzle 8, and most of the pressure energy is converted into kinetic energy to form a high-speed and powerful jet, which is then expanded and atomized and sprayed out from the nozzle;

[0050] (2) The compressed air enters the compressed air tubular waste heat preheater 23 from the compressed air inlet pipe 21 and is preheated by the radiant heat in the furnace at the oxygen-fuel gun installation holes and gaps and the waste heat from the water-cooled wall to become compressed air for primary and secondary combustion. The primary combustion hot compressed air enters the hot air equalizing 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, and then passes through the primary air guide cover 4 and the primary atomizing air inlet 4 to enter the interlayer space between the nozzle and the guide cover. It forms a clockwise rotating airflow through the primary atomizing air guide ring 2, and is ejected through the primary air ring slit nozzle 7. It tangentially collides with the gas (oil) atomized and ejected from the nozzle of the gas (oil) nozzle 1, which helps to atomize it again and evenly mixes the two. It is ignited and burned in the combustion chamber 12 of the gas (oil) oxygen gun to form a high-temperature flame flow.

[0051] (3) The secondary combustion-supporting air enters the gas (oil) oxygen lance combustion chamber 12 through the secondary air cyclone 6 and the millimeter-level annular gap on its outer edge, so that the secondary air flow and the primary air flow form a reverse cyclone, so that the air and the materialized fuel are better mixed. The millimeter-level annular gap on the outer edge of the secondary air cyclone 6 can increase the amount of excess air in the gas (oil) oxygen lance combustion chamber 12, so that the combustion is more complete and the fuel chemical energy utilization rate is higher, so that the flame flow ejected from the combustion chamber preheats the scrap steel in the electric arc furnace and melts it quickly;

[0052] (4) Hard oxygen enters the hard oxygen distribution ring pipe 19 from the hard oxygen inlet pipe 20 and is evenly distributed to the four hard oxygen pipes 17. After being heated by 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, it is ejected from the hard oxygen pipe tangential nozzle 18 at a nozzle angle specifically designed according to different fuels and different arc furnaces. The hard oxygen nozzle can change its injection angle according to production needs during manufacturing, so that it has the same function as a single oxygen lance as a top-blown oxygen lance or a furnace door-blown oxygen lance. Before the scrap steel is piled up, it meets the high-temperature flame flow formed and ejected by ignition and combustion in the combustion chamber 12 of the gas (oil) oxygen lance, forming secondary combustion, quickly melting the preheated scrap steel added to the furnace, and realizing concentrated jet oxygen blowing and decarburization in the middle and late stages of smelting. The oxygen enrichment mode of the novel gas (oil) oxygen lance is to connect the hard oxygen inlet pipe 20 and the hot compressed air outlet 22 with the gas (oil) oxygen lance inlet connecting pipe by setting the oxygen enrichment pipe 28 to mix the hard oxygen into the hot air to form an oxygen-enriched mixed gas, which enters the hot air pressure equalization mixing chamber 5, and enters the gas (oil) oxygen lance combustion chamber 12 through the secondary air cyclone 6 and the primary air annular gap nozzle 7. The oxygen enrichment amount or proportion can be controlled and adjusted according to the furnace condition by the oxygen enrichment control pneumatic valve 29;

[0053] (5) In addition, the hot compressed air inlet 27 is arranged on the gas (oil) oxygen gun housing 9, and the gas (oil) nozzle 1 is fixed by the nozzle hexagonal nut gland 10, and a copper gasket 11 is arranged between the two for effective sealing.

[0054] The utility model has multiple process operation modes:

[0055] (1) Enable burner + primary air + oxygen enrichment mode to preheat scrap steel

[0056] This process operation mode belongs to the process operation mode when the gas (oil) oxygen gun is put into use for the first time and when each furnace loading interval is completed and production begins. A small amount of fuel supply is started. After successful ignition, the primary and secondary combustion air volumes are gradually increased to form a stable combustion flame flow in the oxygen-fuel gun. The amount of fuel and the primary and secondary air volumes are gradually increased. When the flame flow length and diffusion angle meet the requirements, oxygen enrichment can be turned on to increase the flame temperature to preheat the scrap steel.

[0057] (2) Burner + oxygen-enriched + hard oxygen mode, greatly shortening the melting time of scrap steel

[0058] When the scrap steel in the furnace gradually heats up and turns red, the oxygen enrichment can be increased in time to prompt the scrap steel to begin to melt. At the same time, hard oxygen can be turned on to promote the rapid melting of the scrap steel. When the scrap steel is completely melted and enters the molten pool, the heat load of the oxygen-fuel gun can be maintained or adjusted according to the smelting process to meet the smelting needs.

[0059] (3) A separate hard oxygen lance mode or carbon oxygen lance mode to replace the furnace door oxygen lance

[0060] The new gas (oil) oxygen lance can also be used in hard oxygen lance mode to replace the furnace door oxygen lance for mid- and late-stage smelting or carbon oxygen lance mode, and realize concentrated jet oxygen decarburization in the middle and late stages of smelting. The hard oxygen nozzle can change its injection angle according to production needs during manufacturing, making it have the same function as a single oxygen lance as the top oxygen lance and furnace door oxygen lance.

Claims

1. A hard oxygen smelting reverse swirl atomizing air preheating type arc furnace wall oxygen combustion gun, characterized in that: The invention comprises a nozzle (1), a primary air guide cover (4), a secondary air cyclone (6), an oxygen gun shell (9), an oxygen gun combustion chamber (12), a combustion chamber shell (13), a combustion chamber shell (14), a combustion chamber cooling water interlayer (15), a hard oxygen tube support plate (16), a hard oxygen tube (17), a hard oxygen tube tangential nozzle (18), a hard oxygen flow dividing 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 tube type waste heat preheater (23), The oxygen gun is installed with a fixing plate (24), a hot compressed air inlet (27), an oxygen enrichment pipe (28), an oxygen enrichment control pneumatic valve (29) and a carbon spray gun (30); the nozzle (1) is inserted into a secondary air guide cover (4); a secondary air cyclone (6) is fixed at the front of the secondary air guide cover (4) and then inserted into an oxygen gun housing (9); the oxygen gun housing (9) and a combustion chamber housing (13) are fixedly connected together; the combustion chamber housing (13) and the combustion chamber inner housing (14) form a double-layer structure of the oxygen gun combustion chamber (12); the combustion chamber housing (13) and the combustion chamber inner housing (14) form a double-layer structure of the oxygen gun combustion chamber (12); (13) and the combustion chamber shell (14) is a combustion chamber cooling water interlayer (15), and a hard oxygen pipe (17), a hard oxygen pipe support plate (16) and a hard oxygen pipe tangential nozzle (18) connected to the hard oxygen pipe (17) are arranged in the combustion chamber cooling water interlayer (15); the hard oxygen flow distribution 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 gun mounting fixing plate (24) and the compressed air inlet pipe (21) to form an integral combustion air system, and the compressed air pipe type The waste heat preheater (23) is welded obliquely on the combustion chamber shell (13); the hot compressed air outlet pipe (22) is welded on the hot compressed air inlet (27) of the oxygen gun shell (9); the oxygen enrichment control pneumatic valve (29) is installed on the oxygen enrichment pipe (28); one end of the oxygen enrichment pipe (28) is connected to the hot compressed air outlet pipe (22), and the other end is connected to the hard oxygen inlet pipe (20); the carbon spray gun (30) is installed in a ring-shaped uniform distribution on the combustion chamber shell (13) between the oxygen gun shell (9) and the hard oxygen diversion ring pipe (19).

2. The hard oxygen smelting reverse swirl atomizing air preheating type electric arc furnace wall oxygen combustion gun according to claim 1, characterized in that: 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).

3. The hard oxygen smelting reverse swirl atomizing air preheating type electric arc furnace wall oxygen combustion gun according to claim 2, characterized in that: The nozzle (1) and the secondary air guide cover (4) are sealed via a copper gasket (11).

4. The hard oxygen smelting reverse swirl atomizing air preheating type electric arc furnace wall oxygen combustion gun according to claim 3, characterized in that: The nozzle (1) is screwed and fixed in the secondary air guide cover (4) by means of a nozzle hexagonal nut gland (10).

5. The hard oxygen smelting reverse swirl atomizing air preheating type electric arc furnace wall oxygen combustion gun according to claim 1, characterized in that: The hard oxygen pipes (17) are four pipes arranged in a ring.

6. The hard oxygen smelting reverse swirl atomizing air preheating type electric arc furnace wall oxygen combustion gun according to claim 5, characterized in that: The hard oxygen flow dividing ring pipe (19) is semicircular and can cover the pipe openings of four hard oxygen pipes (17).

7. The hard oxygen smelting reverse swirl atomizing air preheating type electric arc furnace wall oxygen combustion gun according to claim 1, characterized in that: The inclination angle of the compressed air tube type waste heat preheater (23) is 30 degrees.

Images