Integrated carbon-oxygen lance for hydrogen-oxygen bundling and powder injection and injection process

Abstract

The invention relates to an integrated carbon-oxygen lance for hydrogen-oxygen bundling and powder injection and an injection process, the integrated carbon-oxygen lance comprises: a powder injection channel located at the center of the integrated carbon-oxygen lance; the multi-spraying-hole bundling channel is arranged around the powder spraying channel, and the multi-spraying-hole bundling channel comprises a set of large-diameter oxygen channels, a set of small-diameter oxygen channels, an annular combustion channel and an epoxy channel; the multi-spray-hole bundling spray head is arranged at one end of the integrated carbon oxygen gun and is connected to the powder spraying channel and the multi-spray-hole bundling channel; the multi-spray-hole cluster spray head comprises a powder spray hole connected to the powder spraying channel, a plurality of large-diameter oxygen spray holes connected to the group of large-diameter oxygen channels, a plurality of small-diameter oxygen spray holes connected to the group of small-diameter oxygen channels, a plurality of ring combustion spray holes connected to the ring combustion channel and a plurality of epoxy spray holes connected to the epoxy channel; and the cooling channel is arranged around the multi-spray-hole bundling channel and wraps the multi-spray-hole bundling spray head.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of metallurgical equipment, in particular to an integrated carbon-oxygen lance for hydrogen-oxygen cluster and powder injection and a blowing process using the integrated carbon-oxygen lance in a smelting process. BACKGROUND

[0002] With the development of the steel industry, electric furnace steelmaking is widely used due to its flexibility and environmental advantages. However, traditional electric arc furnace steelmaking only relies on the electric arc between graphite electrodes and scrap steel to melt raw materials, which has problems such as high energy consumption, low thermal efficiency, long smelting period, and large electrode consumption. In order to solve these problems, oxygen blowing, carbon injection, and powder injection technologies have been developed, which increase the input of chemical energy, strengthen the reaction kinetics, and expand the refining function, thereby improving the quality and efficiency of electric arc furnace smelting. The blowing device has also gradually developed from a single oxygen supply function to a multi-medium and multi-functional integrated direction. For example, the original single oxygen lance has been gradually replaced by an oxygen-fuel integrated cluster oxygen lance, which extends the jet distance of the oxygen jet, strengthens the stirring effect of the jet on the molten pool, and improves the efficiency of the electric arc furnace smelting.

[0003] However, the cluster oxygen lance in the prior art still has the following problems: Firstly, most of the existing carbon powder injection lances are installed separately from the oxygen lance or arranged in parallel in the water-cooled copper box to form a primary and secondary lance. In the electric arc furnace, due to the CO upflow generated by the electrode reaction and the negative pressure suction of the dust removal system, there is a strong transverse airflow in the furnace. The powder injection distance of these technologies is relatively short and dispersed, only 30-50% of the powder can effectively enter the molten pool, causing resource waste and cost increase.

[0004] Secondly, the requirements for the characteristics of the oxygen jet are very different at different stages of the electric furnace smelting process. The single oxygen supply mode of the traditional cluster oxygen lance cannot meet the different needs of each smelting stage, i.e., it cannot achieve the coordinated optimization of oxygen flow and accompanying flow parameters. For example, high-penetration oxygen jets are needed to cut scrap steel during the melting period, large-flow oxygen is needed for decarburization reaction during the oxidation period, and dispersed oxygen flow is needed to promote carbon powder combustion during the foaming slag stage. The fixed throat design of the traditional cluster oxygen lance cannot meet these dynamic changes.

[0005] Thirdly, the existing cluster oxygen lance still has problems such as poor flow regulation adaptability at different smelting stages, short and divergent powder injection distance, and large equipment space occupation, which have not been effectively solved.

[0006] In summary, it is necessary to develop an integrated carbon-oxygen lance that integrates oxygen blowing, powder injection, slagging, and other functions, and a blowing process. SUMMARY

[0007] According to a first aspect of the present application, there is provided an integrated carbon-oxygen lance for hydrogen-oxygen cluster and powder injection, comprising: a powder injection channel located at the center of the integrated carbon-oxygen lance; a multi-nozzle cluster channel arranged around the powder injection channel, wherein the multi-nozzle cluster channel comprises a set of large-diameter oxygen channels, a set of small-diameter oxygen channels, a ring fuel channel, and a ring oxygen channel; a multi-nozzle cluster nozzle arranged at one end of the integrated carbon-oxygen lance and connected to the powder injection channel and the multi-nozzle cluster channel, the multi-nozzle cluster nozzle comprising a powder nozzle connected to the powder injection channel, a plurality of large-diameter oxygen nozzles connected to the set of large-diameter oxygen channels, a plurality of small-diameter oxygen nozzles connected to the set of small-diameter oxygen channels, a plurality of ring fuel nozzles connected to the ring fuel channel, and a plurality of ring oxygen nozzles connected to the ring oxygen channel; and a cooling channel arranged around the multi-nozzle cluster channel and wrapping the multi-nozzle cluster nozzle.

[0008] According to a third aspect of the present application, there is provided an injection process using the integrated carbon-oxygen lance of the present application, wherein one or more of the powder injection channel, the set of large-diameter oxygen channels, the set of small-diameter oxygen channels, the ring oxygen channel, and the ring fuel channel of the integrated carbon-oxygen lance are independently controlled for injection in different modes at different stages of smelting.

[0009] The present application solves the key problems of poor flow regulation adaptability, short and divergent powder injection distance, and large equipment space occupation in electric furnace smelting. The process method flexibly adjusts the injection intensity in a multi-nozzle combination mode according to different stages of electric arc furnace smelting (such as melting, decarburization, temperature rise, and foam slag making), simultaneously injects oxygen, powder (carbon powder or lime powder), and fuel gas into the furnace to complete a series of smelting tasks such as oxygen supply, fluxing, and foam slag making, realizes the integration of oxygen injection, powder injection, and combustion heating in the electric furnace smelting process, and improves the energy efficiency of injection through wide-range and high-precision "on-demand distribution" of oxygen jet characteristics (flow, speed, and cluster degree). BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to better understand the present application, embodiments of the present application will now be described, by way of example only, with reference to the accompanying drawings in which: Figure 1 is a structural schematic diagram of an integrated carbon-oxygen lance according to an embodiment of the present application; Figure 2 is a gun body cross-sectional view of an integrated carbon-oxygen lance according to an embodiment of the present application; Figure 3 is a sectional view of a multi-orifice cluster nozzle of an integrated carbon-oxygen lance according to an embodiment of the present application; Figure 4 A structural schematic diagram of a main oxygen copper head and an embedded copper head in a multi-orifice cluster nozzle of an integrated carbon-oxygen lance according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0011] The integrated carbon-oxygen lance for oxygen cluster and powder injection provided by the present application is capable of flexibly adjusting the injection intensity through multi-orifice combination according to different stages of electric arc furnace smelting (such as melting, decarburization, temperature rising, foam slag forming, etc.), simultaneously injecting oxygen, powder (carbon powder or lime powder) and fuel gas into the furnace to complete a series of smelting tasks such as oxygen supply, fluxing and foam slag forming during the steelmaking process, and realize wide-range and high-precision "on-demand distribution" of oxygen jet characteristics (flow, speed, cluster degree), which perfectly meets the development trend of modern electric arc furnace high-efficiency, energy-saving and flexible smelting.

[0012] Figure 1 A structural schematic diagram of an integrated carbon-oxygen lance according to an embodiment of the present application is shown. Figure 1 As shown, the lance body of the integrated carbon-oxygen lance of the present application is provided with a multi-orifice cluster nozzle 6, a cooling water inlet 5, a cooling water outlet 7, a ring oxygen inlet 4, a fuel gas inlet 3, a large-diameter oxygen supply inlet 2, a small-diameter oxygen supply inlet 8 and a powder inlet 1.

[0013] Figure 2 A sectional view of a lance body of an integrated carbon-oxygen lance according to an embodiment of the present application is shown. Figure 2 As shown, the integrated carbon-oxygen lance of the present application comprises a cooling channel, a powder injection channel, a multi-orifice cluster channel and a sealing connection assembly.

[0014] The cooling channel is arranged at the outer layer of the integrated carbon-oxygen lance.

[0015] The cooling channel comprises a cooling water inlet 5, a cooling water outlet 7, and a water-cooled pipe connected at one end to the cooling water inlet 5 and at the other end to the cooling water outlet 7. The water-cooled pipe can comprise a water-cooled inner pipe 12, an isolation pipe 13 and a water-cooled outer pipe 14.

[0016] The powder injection channel is arranged at the inner layer of the integrated carbon-oxygen lance.

[0017] The powder injection channel comprises a powder inlet 1, and a powder pipe 19 connected at one end to the powder inlet 1 and at the other end to a powder injection orifice 22, wherein the powder pipe is located at the center of the integrated carbon-oxygen lance and used for injecting carbon powder.

[0018] The multi-orifice cluster channel is arranged in the intermediate layer between the outer layer and the inner layer of the integrated carbon-oxygen lance. The multi-orifice cluster channel comprises a large-diameter oxygen supply inlet 2, a group of large-diameter oxygen pipes 9 connected to the large-diameter oxygen supply inlet 2, a small-diameter oxygen supply inlet 8, a group of small-diameter oxygen pipes 10 connected to the small-diameter oxygen supply inlet 8, a fuel gas inlet 3, a ring fuel pipe 11 connected to the fuel gas inlet 3, a ring oxygen inlet 4, a water-cooled inner pipe 12 connected to the ring oxygen inlet 4, and a multi-orifice cluster nozzle 6.

[0019] The multi-orifice cluster nozzle 6 has a plurality of orifices 20, 21, 22, 24, 25, which are respectively connected to a powder pipe 19, a group of large-diameter oxygen pipes 9, a group of small-diameter oxygen pipes 10, a ring fuel channel, and a ring oxygen channel.

[0020] The cooling channel is arranged around the multi-orifice cluster channel and wraps the multi-orifice cluster nozzle.

[0021] The multi-orifice cluster nozzle is surrounded by the cooling channel at the end of the integrated carbon-oxygen lance and forms a directional combustion chamber 23 along the jet direction from the multi-orifice cluster nozzle, which is of a tapered design.

[0022] The sealing connection assembly is a flange, a sealing ring, a gasket, etc. required for connecting each channel, such as 15, 16, 17, 18, etc.

[0023] Figure 3 A cross-sectional view of a multi-orifice cluster nozzle of an integrated carbon-oxygen lance according to an embodiment of the present application is shown. As Figure 3 shown, the multi-orifice cluster nozzle 6 is composed of a main oxygen copper head 26 and an embedded copper head 27, and the embedded copper head 27 is coaxially sleeved on the periphery of the main oxygen copper head 26.

[0024] Figure 4 A structural schematic view of a main oxygen copper head and an embedded copper head in a multi-orifice cluster nozzle of an integrated carbon-oxygen lance according to an embodiment of the present application is shown.

[0025] The main oxygen copper head 26 is a cylinder, on which a powder orifice 22, a plurality of large-diameter oxygen orifices 24, and a plurality of small-diameter oxygen orifices 21 are arranged. The plurality of large-diameter oxygen orifices 24 and the plurality of small-diameter oxygen orifices 21 are distributed around the powder orifice. The plurality of large-diameter oxygen orifices and the plurality of small-diameter oxygen orifices are Laval orifices.

[0026] The built-in copper head 27 is a circular ring body. A plurality of grooves are uniformly arranged on the inner side and the outer side of the built-in copper head in the axial direction, for forming the plurality of annular fuel injection holes 25 and the plurality of annular oxygen injection holes 20 respectively. The cross sections of the annular fuel injection holes 25 and the annular oxygen injection holes 20 are substantially semicircular, and the number of the annular fuel injection holes 25 and the annular oxygen injection holes 20 can be the same or different.

[0027] The main oxygen copper head 26 is fixedly connected to the set of large-diameter oxygen channels (specifically, a set of large-diameter oxygen pipes 9) and the set of small-diameter oxygen channels (specifically, a set of small-diameter oxygen pipes 10), and the built-in copper head 27 is fixedly connected to the annular fuel channel (specifically, an annular fuel pipe 11) and the annular oxygen channel (specifically, a channel between the annular fuel pipe 11 and a water-cooled inner pipe 12). In particular, the connection mode can be a welded fixed connection.

[0028] Each channel (specifically, each pipe) is sealed and connected by a flange, so as to facilitate disassembly of the channels.

[0029] The water-cooled outer pipe 14, the isolation pipe 13, the water-cooled inner pipe 12, the annular fuel pipe 11, the large-diameter oxygen pipe 9, the small-diameter oxygen pipe 10 and the powder pipe 19 are coaxially arranged from the outside to the inside, i.e., their center lines coincide. The water-cooled outer pipe 14 and the water-cooled inner pipe 12 are in communication with each other at one end close to the multi-injection hole cluster nozzle 6, and form a tapered combustion chamber 23.

[0030] The water-cooled outer pipe 14 and the water-cooled inner pipe 12 are separated by the isolation pipe 13 to form a cooling loop, and the water-cooled outer pipe 14, the isolation pipe 13 and the water-cooled inner pipe 12 are sealed and connected by a flange 15. The water-cooled inner pipe 12 and the annular fuel pipe 11 form an annular oxygen channel, oxygen is blown in through the annular oxygen inlet 4 and is sprayed out from the annular oxygen injection holes 20 of the multi-injection hole cluster nozzle 6, and the water-cooled inner pipe 14 and the annular fuel pipe 11 are sealed and connected by a flange 16.

[0031] The annular fuel pipe 11 and the large-diameter oxygen pipe 9 form an annular fuel channel, fuel (preferably hydrogen fuel) is blown in through the fuel gas inlet 3 and is sprayed out from the annular fuel injection holes 25 of the multi-injection hole cluster nozzle 6. The annular fuel pipe 11 and the large-diameter oxygen pipe 9 are sealed and connected by a flange 17.

[0032] Preferably, high-flow hydrogen can be used as the annular fuel gas of the electric arc furnace cluster oxygen lance, which can further realize low-carbon steelmaking of the electric arc furnace.

[0033] The main oxygen is blown from the large-diameter oxygen supply inlet 2 and sprayed from the large-diameter oxygen spray holes 24 of the multi-nozzle cluster spray head 6 in the large-diameter oxygen pipe 9. The main oxygen can also be blown from the small-diameter oxygen supply inlet 8 and sprayed from the small-diameter oxygen spray holes 21 of the multi-nozzle cluster spray head 6 in the small-diameter oxygen pipe 10. The large-diameter oxygen pipe 9, the small-diameter oxygen pipe 10, and the powder pipe 19 are sealingly connected by the flange 18. The main oxygen copper head 26 of the multi-nozzle cluster spray head 6 is fixedly connected with the large-diameter oxygen pipe 9 and the small-diameter oxygen pipe 10 by welding, and the built-in copper head 27 is fixedly connected with the ring combustion pipe 11 by welding. Oxygen and fuel gas are mixed and burned in the directional combustion chamber 23 to form a high-temperature "fire jacket" to strengthen the protection of the main oxygen jet and the powder.

[0034] The blowing process of the present application is to use the integrated carbon-oxygen gun for hydrogen-oxygen cluster and powder blowing provided by the present application. One or more of the powder blowing channel, the group of large-diameter oxygen channels, the group of small-diameter oxygen channels, the ring oxygen channel, and the ring combustion channel of the integrated carbon-oxygen gun are independently controlled for blowing in different modes at different stages of smelting.

[0035] The control process of the above-mentioned integrated carbon-oxygen gun is to configure 2 to 6 water-cooled integrated oxygen gun blowing devices in the furnace wall refractory or the inner side of the water-cooled furnace wall according to the electric arc furnace type and the furnace charge structure, the installation position is at a distance of 300 to 800 mm from the slag line plane, the vertical angle (the included angle between the oxygen gun axis and the furnace wall) of the installation is 35 to 48°, and the horizontal angle (the included angle between the oxygen gun axis and the slag line plane) is 3 to 15°.

[0036] During the electric arc furnace smelting process, the blowing intensity can be flexibly adjusted by the multi-nozzle combination mode according to different smelting stages (such as melting, decarburization, temperature rising, and foam slag making).

[0037] Taking a large-scale electric furnace (for example, a 100-150 ton electric furnace) as an example: In the initial stage of smelting (0 to 15 minutes), it is in the melting penetration mode, the molten pool temperature is <1450℃, and the scrap steel is not completely melted, at this time only one group of large-diameter oxygen channels is opened, the oxygen supply is of medium intensity, and the accompanying flow fuel gas is in a medium flow mode. Among them, the medium intensity oxygen supply is 2000 to 3000 of the total oxygen flow ; the powder blowing channel can be connected to oxygen, the purpose is to form a moderate combustion "fire jacket" to cut the scrap steel and accelerate the melting of the scrap steel to create good molten pool conditions for subsequent smelting.

[0038] In the middle of smelting (15 to 35 minutes) for strong decarburization mode, the temperature of the molten pool ≥ 1500 ℃, [C] > 0.1%, while opening the group of large diameter oxygen channel and the group of small diameter oxygen channel, using high intensity oxygen supply, with flow gas using large flow mode; the high intensity oxygen supply is the total oxygen flow to 3500 to 4500 , the large flow mode is the gas flow is 300 to 600 ; powder injection channel can spray carbon powder for bubble forming slag and reduction, the injection flow is controlled at 0 to 50 kg / min; also can spray lime powder to dephosphorize, the injection flow is controlled at 0 to 200 kg / min. Keep the length of the combustion "fire jacket" moderate, maximize the decarburization efficiency, strengthen the molten pool stirring, promote the carbon oxygen reaction.

[0039] If the slag layer foaming difficulty or carbon oxygen reaction is observed, it is a bubble slag mode, the group of large diameter oxygen channel or the group of small diameter oxygen channel can be opened, using medium intensity oxygen supply, with flow gas using small flow mode; the small flow mode is the gas flow is 50 to 150 , shorten the length of the combustion "fire jacket" to expand the impact area, promote the carbon powder combustion, form high quality bubble slag, improve the thermal efficiency; In the late smelting (≥ 35 minutes) for the heat preservation mode, [C] < 0.05%, the temperature of the molten pool ≥ 1580 ℃, only opening the group of small diameter oxygen channel, using low intensity oxygen supply, with flow gas flow minimization. The low intensity oxygen supply is the total oxygen flow to 1200 to 1800 , with flow gas flow minimization (0 to 50 ), keep the molten pool slightly positive pressure, prevent gas suction, while avoiding excessive oxidation.

[0040] The smelting process can be adjusted according to the charging condition (hot metal + scrap steel, all scrap steel) and blowing state in time to realize the efficient smelting process.

[0041] As in the early stage of iron, scrap steel is continuously added, to ensure the buried arc effect of rapid bubble forming slag, take "strong carbon injection, weak oxygen supply" operation.

[0042] In the middle of iron, the speed of scrap steel charging is slowed down, take "weak carbon injection, strong oxygen supply" operation.

[0043] In the late stage of iron, no scrap steel is added, mainly oxygen supply, basically no carbon injection.

[0044] Similarly, the injection process is also suitable for all scrap steel or, scrap steel + direct reduced iron charge structure.

[0045] The integral carbon-oxygen lance is detachable, convenient for timely replacement and maintenance, and can switch the powder injection, oxygen blowing and combustion functions to realize multifunctional smelting.

[0046] When only powder injection is needed without oxygen blowing, the gas and oxygen supply can be closed to realize the powder injection function; when only oxygen blowing is needed without powder injection, oxygen can be supplied to the powder injection channel to realize the oxygen blowing function in cooperation with the multiple injection holes; when only combustion heating is needed, the powder injection channel can be supplied with gas to realize the combustion function.

[0047] Compared with the conventional cluster oxygen lance having only a single oxygen supply channel (single Laval main oxygen injection hole), the dual-channel independent control advantage of the present application is that: 1. Wide flow regulation range and always high efficiency The Laval injection hole of the single-channel can only work effectively within a limited pressure range by adjusting the pressure parameter to change the jet quality, and when deviating from the design condition too far, the jet quality will deteriorate seriously and the energy loss will be large. The integral carbon-oxygen lance of the present application uses multi-injection hole combination regulation (grouping) to realize "stepwise" switching, always close to the design condition, and whether one group or all groups are opened, the jet works under its respective design condition, maintaining supersonic speed and clustering, and adapting to the needs of different stages.

[0048] 2. Redundancy backup to improve system reliability

[0049] Once the Laval injection hole of the single-channel is blocked or the valve fails, the entire oxygen lance will immediately fail and must be replaced, causing huge losses. If one group of injection holes or the valve controlled thereby fails (e.g. blocked) in the integral carbon-oxygen lance of the present application, the group of injection holes can be immediately closed and switched to another group of injection holes to continue blowing oxygen, which can ensure that the electric arc furnace is not forced to interrupt smelting and complete the production of the current furnace. It increases the hardware complexity (more pipelines, valves and grouped injection holes) in the early stage to obtain good jet quality, flexible and extensive process adaptability and higher system reliability throughout the smelting process.

[0050] 3. More optimized oxygen flow field and chemical reaction

[0051] The size of the Laval injection hole of the single-channel is a fixed compromise. In order to meet the high flow demand, the injection hole cannot be too small; but in order to be used at low flow, the injection hole cannot be too large. The integral carbon-oxygen lance of the present application can create a more complex flow field and stirring mode in the molten pool by alternately or in a specific sequence opening and closing different groups of channels, avoid local over-oxidation and furnace lining erosion caused by a single impact point, and promote the uniformity of the composition and temperature of the molten pool.

[0052] The technical solution of the present application can bring the following beneficial effects: 1. The integrated carbon-oxygen lance for hydrogen-oxygen cluster and powder injection of the present application adopts a "multi-channel + multi-nozzle combination" mode to flexibly adjust the injection intensity of the electric arc furnace smelting at different stages (such as melting, decarburization, temperature rise, foam slag formation, etc.), realizing wide-range and high-precision "on-demand distribution" of oxygen jet characteristics (flow, speed, cluster degree), perfectly fitting the development trend of modern electric arc furnace high-efficiency, energy-saving, flexible smelting.

[0053] 2. The integrated carbon-oxygen lance for hydrogen-oxygen cluster and powder injection of the present application adopts a multi-coaxial structure, through the nested design of water cooling channel (outer layer), multi-nozzle cluster channel (middle layer) and powder injection channel (inner layer), integrating cooling, oxygen supply / burning heating and powder injection functions, reducing the equipment occupied space, improving the blowing energy efficiency of the oxygen lance system, and strengthening the electric furnace smelting.

[0054] 3. The integrated carbon-oxygen lance for hydrogen-oxygen cluster and powder injection of the present application is designed to be detachable, not only convenient and timely replacement and maintenance, but also can complete the switching of powder injection, oxygen blowing and combustion function, realize multi-functional smelting. It can accurately match the chemical and physical requirements (such as impact depth, stirring intensity, reaction area) of different smelting stages of electric arc furnace, thereby improving the decarburization effect, promoting the formation of foam slag, and improving the oxygen utilization efficiency.

[0055] 4. The integrated carbon-oxygen lance for hydrogen-oxygen cluster and powder injection of the present application uses high-flow hydrogen instead of methane as the fuel gas of the electric arc furnace cluster jet oxygen lance, reducing carbon emissions during steelmaking process; the directional combustion chamber at the end of the oxygen lance nozzle adopts a tapered design, so that the premixed gas is sprayed after acceleration by contraction, the jet concentration is higher, the protection effect on the powder is better, and the injection efficiency is improved.

Claims

1. An integrated carbon-oxygen gun for hydrogen-oxygen clustering and powder spraying, the integrated carbon-oxygen gun comprising: The powder spraying channel is located at the center of the integrated carbon-oxygen gun; A multi-orifice cluster channel is disposed around the powder spraying channel, wherein the multi-orifice cluster channel includes a set of large-diameter oxygen channels, a set of small-diameter oxygen channels, an epoxidation channel, and an epoxy channel; A multi-orifice cluster nozzle, disposed at one end of the integrated carbon-oxygen lance and connected to the powder injection channel and the multi-orifice cluster channel, the multi-orifice cluster nozzle including a powder injection orifice connected to the powder injection channel, multiple large-diameter oxygen injection orifices connected to the set of large-diameter oxygen channels, multiple small-diameter oxygen injection orifices connected to the set of small-diameter oxygen channels, multiple ionization injection orifices connected to the ionization channel, and multiple epoxy injection orifices connected to the epoxy channel; and A cooling channel is provided around the multi-orifice cluster channel and surrounds the multi-orifice cluster nozzle.

2. The integrated carbon-oxygen lance according to claim 1, wherein, The multi-orifice cluster nozzle consists of a main oxygen copper head and an inner copper head, with the inner copper head coaxially sleeved around the main oxygen copper head. The main oxygen copper head is provided with the powder spray hole, the plurality of large-diameter oxygen spray holes and the plurality of small-diameter oxygen spray holes; The inner and outer surfaces of the built-in copper head are provided with a plurality of grooves axially and uniformly to form the plurality of annular combustion nozzles and the plurality of epoxy nozzles, respectively.

3. The integrated carbon-oxygen lance according to claim 2, wherein, The set of large-diameter oxygen nozzles and the set of small-diameter oxygen nozzles are distributed intersectingly around the powder nozzles.

4. The integrated carbon-oxygen lance according to claim 2, wherein, The set of large-diameter oxygen nozzles and the set of small-diameter oxygen nozzles are Laval nozzles.

5. The integrated carbon-oxygen lance according to claim 2, wherein, The cross-sections of the plurality of annular combustion nozzles and the plurality of epoxy nozzles are all semi-circular.

6. The integrated carbon-oxygen lance according to claim 2, wherein, The main oxygen copper head is fixedly connected to the set of large-diameter oxygen channels and the set of small-diameter oxygen channels; and The built-in copper head is fixedly connected to the epoxy channel and the epoxy channel.

7. The integrated carbon-oxygen lance according to claim 2, wherein, Each channel and the main oxygen copper head and the built-in copper head fixedly connected to each channel can be disassembled or extracted.

8. The integrated carbon-oxygen lance according to claim 1, wherein, The cooling channel encloses the multi-hole cluster nozzle and forms a directional combustion chamber along the injection direction from the multi-hole cluster nozzle. The directional combustion chamber is tapered.

9. A jetting process, wherein the jetting process employs the integrated carbon-oxygen gun according to claim 1, wherein, The powder injection channel, a set of large-diameter oxygen channels, a set of small-diameter oxygen channels, an epoxy channel, and an annular combustion channel of the integrated carbon-oxygen lance can be independently controlled to inject powder in different modes at different stages of smelting.

10. The jetting process according to claim 9, wherein, When only powder injection is required and no oxygen injection is needed, only the powder injection channel is opened and the set of large-diameter oxygen channels, the set of small-diameter oxygen channels, the epoxidation channel, and the epoxy channel are closed; When only oxygen injection is needed and not powder injection is required, the powder injection channel can be used to inject oxygen; and When only combustion heating is required, the powder injection channel can be used to inject combustion gases.

11. The jetting process according to claim 9, wherein, During the smelting process: In melting and penetration mode, only one set of large-diameter oxygen channels is opened, and medium-intensity oxygen supply is used, while the accompanying gas uses medium-flow mode; In the strong decarbonization mode, the set of large-diameter oxygen channels and the set of small-diameter oxygen channels are opened simultaneously, and high-intensity oxygen supply is adopted, while the accompanying gas adopts a high-flow mode. In foam slag mode, open the set of large-diameter oxygen channels or the set of small-diameter oxygen channels, use medium-intensity oxygen supply, and use low-flow-rate mode for the accompanying gas. In heat preservation mode, only the set of small-diameter oxygen channels are opened, and low-intensity oxygen supply is adopted, minimizing the flow rate of the accompanying gas.

12. The jetting process according to claim 11, wherein, During the smelting process, the injection flow rates of oxygen, fuel gas, and powder can be adjusted in a timely manner according to the feeding situation and blowing status. The furnace charge structure applicable to the injection process is scrap steel plus molten iron, or all scrap steel or scrap steel plus direct reduced iron.

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