CN206127350U - Efflux oxygen rifle tied in a bundle - Google Patents

Abstract

The utility model provides an efflux oxygen rifle tied in a bundle, including oxygen rifle, water -cooling wall, valve station and PLC control system. Efflux oxygen rifle tied in a bundle simple structure ingenious, light in weight, convenient operation is swift, adaptive is good, to the penetration in molten bath than the big play of conventional efflux about 80%, can reach and stir same molten bath mixing time with the bottom blowing, installation electric stove oven need not not operation management, automatic control completely in the smelting process, spun oxygen flow is less than traditional oxygen rifle, therefore the splash obviously reduces in the stove, and lining erosion also reduces thereupon, can obtain higher decarbonization speed with lower oxygen suppliment volume, oxygen utilization rate improves, can obtain foamed slag good, that last with the lower volume of spouting the charcoal, the electric stove can cut out the furnace gate in operation process, reduce the air infiltration, the operating result of different melts is more stable, and the repeatability is good.

Description

Coherent jet oxygen lance

Technical Field

The utility model belongs to the technical field of the oxygen rifle, concretely relates to efflux oxygen rifle tied in a bundle.

Background

The oxygen lance is one of the main process devices in oxygen converter steelmaking, and the performance characteristics of the oxygen lance directly influence the smelting effect and the blowing time, thereby influencing the quality and the yield of steel. The method is characterized in that: the gun core is a common water gas steel pipe, the two ends of the steel pipe are provided with internal and external threads with the same size, and the outer layer is a knotting refractory material layer with a male tenon and a female tenon. Electric furnace steelmaking mainly relies on automatic oxygen blowing of a furnace door oxygen lance and auxiliary manual oxygen blowing of an oxygen blowing pipe, but the manual oxygen blowing has the following problems: the labor intensity is high, and the safety problem is more; the consumption of the consumable oxygen lance is high, 2-4 kg of steel per ton and the cost is 8-16 yuan/t; the oxygen supply intensity is not enough, so that the method is not suitable for high-rhythm production; the oxygen utilization rate is low, the operation randomness is high, and the production management is difficult; meanwhile, the problem of insufficient oxygen supply in a cold area of the electric furnace exists in oxygen blowing by using a furnace door gun: in the melting period of the electric furnace, under the action of the strong electric arc of the electrode, furnace burden under the electrode is rapidly melted, and the scrap steel in the furnace is penetrated into 3 well holes. Along with the proceeding of the heat transfer process from the inside to the outside of the through-well region, the melting region continuously expands from the through-well region to the outside to form the gradual melting process of the furnace burden, and 3 cold regions are formed between the electrodes and close to the furnace wall, so that the melting time is prolonged. If 3 cold areas introduce new heat sources, the cold areas can be eliminated, thereby achieving the purpose of shortening the melting period of the electric furnace. This is the basic idea of coherent jet oxygen lance. The oxygen combustion spray gun is adopted to completely combust under the action of sufficient oxygen to form flame above 2500 ℃, so that not only is scrap steel directly cut in a cold area, but also the generated high-temperature flue gas flows at high speed in gaps of a furnace lining, so that the high-temperature flue gas has high convective heat transfer capability, and the radiation of the flame is also transferred to high heat of furnace burden. Meanwhile, the proper oxygen supply can ensure the combustion effect of oxygen removal, and does not react with elements in the steel and the scrap steel. The comprehensive effects of the several aspects enable the furnace charge to be melted uniformly and rapidly, shorten the melting period and achieve the effects of saving electricity and increasing the yield. Coherent jet oxygen lances are being developed based on the above problems. It utilizes the cluster oxygen lance installed in the cold zone position of furnace wall to supply oxygen in a centralized way, thus thoroughly solving the difficult problem of insufficient oxygen supply in the cold zone of electric furnace, shortening smelting time, avoiding the insecurity and uncertainty of oxygen blowing of manual oxygen lance, and improving the comprehensive efficiency of electric arc furnace production. The oxygen combustion spray gun has obvious effects of saving electricity and increasing yield. The coherent oxygen lance is based on the principle that the outer layer surrounding accompanying flow is added around the traditional oxygen lance, so that the expansion and the attenuation of the central supersonic jet flow are smaller, and the supersonic jet flow is longer. The penetration depth and the stirring strength of the oxygen jet flow to a molten pool are improved, and simultaneously, because the attenuation of the jet flow speed is delayed, the converting lance position of the oxygen lance can be improved, the impact depth of the jet flow to molten steel is not influenced, and the service life of a nozzle of the oxygen lance is prolonged. The furnace wall coherent oxygen lance mainly has the functions of strengthening electric furnace smelting, shortening smelting time, reducing smelting cost, improving molten steel quality, reducing labor intensity of workers and improving the automation level of electric furnace smelting. However, the penetration depth of the prior coherent oxygen lance to a molten pool is poor, the uniform mixing time of the molten pool is difficult to achieve the same as that of bottom blowing stirring, the automatic control is poor, the flow of the sprayed oxygen is high, the splashing in the furnace is obvious, the erosion of the furnace lining is obvious, the lower oxygen supply amount is difficult to obtain higher decarburization rate, the operation results of different furnaces are unstable, and the repeatability is poor.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a jet oxygen rifle tied in a bundle, overcome above-mentioned defect, solve above-mentioned problem.

In order to solve the technical problem, the utility model provides a coherent jet oxygen lance, which comprises an oxygen lance, a water-cooled wall, a valve station and a PLC control system,

gas enters the valve station from one end of a pipeline, the PLC control system controls the valve station, the other end of the pipeline is connected with an oxygen lance or a water-cooled wall,

the oxygen lance comprises a main oxygen channel, a gas channel and a combustion-supporting oxygen channel, the water-cooled wall comprises a water-cooled copper sleeve seat, the water-cooled copper sleeve seat is provided with a cooling water inlet, a cooling water outlet, a secondary combustion oxygen port and a carbon powder port, the oxygen lance is arranged above the water-cooled copper sleeve seat and is connected with the water-cooled copper sleeve seat, the top end of the oxygen lance is provided with an oxygen lance cover, the center of the oxygen lance cover is provided with an oxygen lance through hole, an oxygen lance pipe body is arranged below the oxygen lance cover, the oxygen lance pipe body is connected with the water-cooled copper sleeve seat, the main oxygen channel is arranged at the upper part of the center of the oxygen lance pipe body, the gas channel is arranged on the side wall of the oxygen lance pipe body, the combustion-supporting oxygen channel is arranged at the lower part of the center of the oxygen lance pipe body, the aperture of the combustion-supporting oxygen channel is, the side wall window is arranged between the combustion-supporting oxygen channel and the main oxygen channel.

As a preferred scheme of the coherent jet oxygen lance of the present invention, the valve station comprises a first valve, a second valve, a third valve, a fourth valve, a fifth valve and a sixth valve, the PLC control system comprises a first controller, a second controller, a third controller, a fourth controller, a fifth controller and a sixth controller, the first valve is disposed on the first connecting pipeline of the main oxygen passage, the second valve is disposed on the second connecting pipeline of the gas passage, the third valve is disposed on the third connecting pipeline of the secondary combustion oxygen port, the fourth valve is disposed on the fourth connecting pipeline of the combustion-supporting oxygen passage, the fifth valve is disposed on the fifth connecting pipeline of the cooling water inlet, the sixth valve is disposed on the sixth connecting pipeline of the cooling water outlet, the cooling water import with the cooling water export passes through the cooling water access connection, the cooling water passageway set up in the water-cooling copper jacket seat, the cooling water passageway laminating combustion-supporting oxygen passageway, first controller control first valve, second controller control the second valve, the third controller control the third valve, the fourth controller control the fourth valve, the fifth controller control the fifth valve, the sixth controller control the sixth valve.

As an optimal scheme of jet oxygen rifle tied in a bundle, be equipped with a plurality of mixed gas holes on the oxygen rifle shroud, the below of mixing the gas hole is provided with cyclic annular mixed gas area, mix gas hole intercommunication cyclic annular mixed gas area, gas passageway and combustion-supporting oxygen passageway all with cyclic annular mixed gas area intercommunication.

As a preferred scheme of the coherent jet oxygen lance of the utility model, the included angle between the central line of the mixed gas hole and the central line of the oxygen lance through hole is 42-45 degrees.

As an optimized proposal of the coherent jet oxygen lance, the mixed gas hole is arranged around the oxygen lance through hole and is a plurality of the mixed gas hole is radially and evenly arranged.

As an optimized proposal of the coherent jet oxygen lance of the utility model, a plurality of the mixed gas holes are radially provided with 12.

As an optimized proposal of the coherent jet oxygen lance of the utility model, a plurality of mixed gas holes are circumferentially arranged.

As an optimized proposal of the coherent jet oxygen lance of the utility model, a plurality of the mixed gas holes are circumferentially arranged in two circles.

Compared with the prior art, the utility model provides a efflux oxygen rifle tied in a bundle, simple structure is ingenious, and light in weight, convenient operation is swift, and the adaptivity is good, better adapts to internal electric stove production characteristics, uses the actual requirement according to different users simultaneously, has increased some functions more practical. Such as: the burner has the functions of burning, cluster oxygen blowing and decarburization, secondary combustion, whole-process foam slag smelting, multi-gun circulation and prevention of peroxidation. The coherent oxygen lance has the function of keeping the initial speed, the diameter, the gas concentration and the impact force of jet flow within the distance (1-2M) which is more than 60 times of the diameter of a spray hole, and the advantages of the technology are embodied in that: the penetration depth of the molten pool is about 80% greater than that of the conventional jet flow; the molten pool mixing time same as that of bottom blowing stirring can be achieved; the furnace wall of the electric furnace is installed, operation management is not needed in the smelting process, and the furnace can be completely and automatically controlled; the flow of the ejected oxygen is lower than that of the traditional oxygen lance, so that the splashing in the furnace is obviously reduced, and the erosion of the furnace lining is reduced; higher decarburization rate can be obtained with lower oxygen supply amount, and the oxygen utilization rate is improved; good and continuous foaming slag can be obtained with lower carbon spraying amount; the furnace door of the electric furnace can be closed in the operation process, so that the air infiltration is reduced; the operation results of different heats are more stable and the reproducibility is good.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor. Wherein,

FIG. 1 is a schematic view of an oxygen lance body structure of a coherent jet oxygen lance of the present invention;

FIG. 2 is a schematic view of the connection structure between the oxygen lance tube and the pipeline of the coherent jet oxygen lance of the present invention.

Wherein: 1 is a main oxygen channel, 2 is a fuel gas channel, 3 is a combustion-supporting oxygen channel, 4 is a water-cooling copper sleeve seat, 5 is a cooling water inlet, 6 is a secondary combustion oxygen port, 7 is a carbon powder port, 8 is an oxygen lance pipe body, 9 is a side wall window, 10 is a first connecting pipeline, 11 is a second connecting pipeline, 12 is a third connecting pipeline, 13 is a fourth connecting pipeline, 14 is a fifth connecting pipeline, 15 is a sixth connecting pipeline, and 16 is a cooling water outlet.

Detailed Description

The utility model discloses a efflux oxygen rifle tied in a bundle, it includes: an oxygen lance (not shown), a water wall (not shown), a valve station (not shown), and a PLC control system (not shown).

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the following embodiments.

First, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with at least one implementation of the invention is included. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

Secondly, the utility model discloses utilize the structure sketch map etc. to describe in detail, when detailing the utility model discloses the embodiment, for the convenience of explanation, the sketch map that shows jet oxygen rifle structure tied in a bundle can not do local enlargement according to general proportion, moreover the sketch map is the example only, and it should not limit the scope of the protection of the utility model here. In addition, the actual fabrication process should include three-dimensional space of length, width and depth.

Example one

Referring to fig. 1 and 2, fig. 1 is a schematic structural view of an oxygen lance tube of a coherent jet oxygen lance of the present invention; FIG. 2 is a schematic view of the connection structure between the oxygen lance tube and the pipeline of the coherent jet oxygen lance of the present invention. As shown in figures 1 and 2, the utility model provides a coherent jet oxygen lance, which comprises an oxygen lance, a water-cooled wall, a valve station and a PLC control system.

And gas enters the valve station from one end of the pipeline, the PLC control system controls the valve station, and the other end of the pipeline is connected with the oxygen lance or the water-cooled wall. The PLC control system respectively controls oxygen, fuel gas and compressed air and is operated by a computer in a main control room.

The oxygen lance comprises a main oxygen channel 1, a gas channel 2 and a combustion-supporting oxygen channel 3, the water-cooled wall comprises a water-cooled copper sleeve seat 4, the water-cooled copper sleeve seat 4 is provided with a cooling water inlet 5, a cooling water outlet 16, a secondary combustion oxygen port 6 and a carbon powder port 7, the oxygen lance is arranged above the water-cooled copper sleeve seat 4 and is connected with the water-cooled copper sleeve seat 4, the top end of the oxygen lance is provided with an oxygen lance cover cap (not shown), the center of the oxygen lance cover cap is provided with an oxygen lance through hole (not shown), an oxygen lance pipe body (not shown) is arranged below the oxygen lance cover cap, the oxygen lance pipe body is connected with the water-cooled copper sleeve seat 4, the main oxygen channel 1 is arranged at the upper center part of the oxygen lance pipe body, the gas channel 2 is arranged on the side wall of the oxygen lance pipe body, the combustion-, the aperture of the combustion-supporting oxygen channel 3 is larger than that of the main oxygen channel 1, the side wall of the oxygen lance tube body is also provided with a plurality of side wall windows 9 which penetrate through the side wall, and the side wall windows 9 are arranged between the combustion-supporting oxygen channel 3 and the main oxygen channel 1.

The valve station includes a first valve (not shown), a second valve (not shown), a third valve (not shown), a fourth valve (not shown), a fifth valve (not shown), and a sixth valve (not shown), the PLC control system includes a first controller (not shown), a second controller (not shown), a third controller (not shown), a fourth controller (not shown), a fifth controller (not shown), and a sixth controller (not shown), the first valve is disposed on the first connection pipe 10 of the main oxygen passage 1, the second valve is disposed on the second connection pipe 11 of the gas passage 2, the third valve is disposed on the third connection pipe 12 of the secondary combustion oxygen port 6, the fourth valve is disposed on the fourth connection pipe 13 of the combustion-supporting oxygen passage 3, and the fifth valve is disposed on the fifth connection pipe 14 of the cooling water inlet 5, the sixth valve set up in on the sixth connecting tube 15 of cooling water export 16, cooling water inlet 5 with cooling water export 16 connects through cooling water passageway (not shown in the figure), the cooling water passageway set up in the water-cooling copper sheathing seat 4, the laminating of cooling water passageway combustion-supporting oxygen passageway 3, first controller control first valve, second controller control the second valve, third controller control the third valve, fourth controller control the fourth valve, fifth controller control the fifth valve, sixth controller control the sixth valve.

The oxygen lance cover is provided with a plurality of mixed gas holes (not shown), an annular mixed gas belt (not shown) is arranged below the mixed gas holes, the mixed gas holes are communicated with the annular mixed gas belt, and the gas channel 2 and the combustion-supporting oxygen channel 3 are communicated with the annular mixed gas belt.

The included angle between the central line of the mixed gas hole and the central line of the oxygen lance through hole is 42-45 degrees.

The mixed gas holes are formed around the oxygen lance through hole, and the mixed gas holes are uniformly formed in the radial direction. And 12 mixed gas holes are radially arranged. A plurality of mixed gas hole circumference sets up. A plurality of mixed gas hole circumference sets up two circles.

The coherent jet oxygen lance obtains the following effects after being applied: power saving: 15 percent; the power-on time is reduced: 14 percent; the smelting period is shortened: 11 percent; electrode consumption is reduced: 12 percent; the steel tapping amount is improved: 0.6 percent; the production operation rate is improved: 11.6 percent; the oxygen utilization rate is improved: 18 percent.

In the early stage of smelting, an oxygen lance preheats and melts furnace charge to fulfill the function of a burner; after the furnace burden is melted to form a molten pool, oxygen is blown into the molten pool to fulfill the functions of slagging and decarburization; the process is always accompanied by secondary combustion to increase the furnace temperature. The working modes of the oxygen lance can be selected according to the process requirements in the smelting process, and the typical working modes comprise 4 types:

1. preheating (burner function) + secondary combustion

2. Melting (burner function) + afterburning

3. Heating + slagging (oxygen lance function) + secondary combustion

4. Decarburization (oxygen lance function) + secondary combustion

The manufacturing of the coherent jet oxygen lance mainly comprises the following points:

1. casting: the pure copper has better electric and heat conducting performance, so the oxygen lance nozzle and the water cooling plate are made of pure copper. The main performance indexes of the pure copper are electrical conductivity (heat conductivity) and density, the main factors influencing the electrical conductivity are impurity content, and the main factors influencing the density of a casting are two factors, namely shrinkage cavity (including porosity) and air hole. Shrinkage cavities are caused by body shrinkage during solidification, and pores are caused by gas evolution during solidification. The prevention of shrinkage cavity is realized by means of reasonable casting process, and the prevention of pores is mainly realized by performing air suction control on copper liquid in the smelting process and performing deoxidation treatment in the later stage of smelting. The core of the process of nozzle casting is the control of metal impurities and the prevention of blowholes. The core of the air hole is deoxidation, which is not only to remove oxygen, but also not to leave impurities which affect the conductivity. Processing: the processing is mainly used for processing the spray holes. The standard Laval tube processing needs to be carried out on a numerical control machine tool, and the processing is too complex to be widely applied. The processing of the spray head of the company is finished on a common lathe through special tools, and the processing precision is well ensured. The surface smoothness of the oxygen holes is generally required to be 6 or more, and if the surface accuracy is not enough, shock waves and other problems can be generated, and the properties of the jet flow are seriously influenced. If the shape at the orifice exit deviates from the designed "true circle" (from the direction perpendicular to the oxygen holes), the jet becomes asymmetric, jet deflection occurs, the properties change substantially, and the velocity is greatly reduced. If the convex-concave phenomenon appears at the outlet, the jet flow becomes a convergent/divergent jet flow, the head loss is large, and the jet flow speed is greatly reduced.

2. Welding: the copper-steel welding of the nozzle and the connecting pipe is needed for manufacturing the oxygen lance or providing the nozzle, and the process has certain particularity because the copper-steel welding is dissimilar metal welding. This company uses gas metal arc welding. The welding among various copper parts of the spray head adopts the special brazing process of the company.

3. And (4) checking: carrying out X-ray flaw detection on the copper-steel welding seam; carrying out dye check on each butt joint steel pipe of the gun body; and carrying out water pressure inspection on the spray head and the assembled oxygen lance.

Design basis and basic technical parameters of coherent jet oxygen lance

The fluxing of natural gas-oxygen cluster spray gun is an important measure for strengthening smelting (V) HP of electric furnace, the electrodes of electric arc furnace are arranged in triangle, so that the cold zone and hot zone are formed in the electric furnace, the scrap steel melting in the cold zone prolongs the smelting melting time, the energy loss of the electric furnace is increased, the implementation of the fluxing of natural gas-oxygen effectively solves the problem that the natural gas oxygen nozzle is arranged in the cold zone to supplement heat energy, the melting of the scrap steel in the furnace is accelerated, the natural gas oxygen is properly adjusted and proportioned, the fluxing heat efficiency of the natural gas-oxygen cluster spray gun can reach 60% -65%, the number of nozzles and the fluxing power are set on the electric furnace, the temperature rising balance of the hot zone and the cold zone is kept, and simultaneously, the local temperature rise in the furnace is not too high to cause heat energy loss and burning loss of materials in. 3 burners are arranged on the electric furnace, and the fluxing power is generally 30-40% of the power of the electric furnace transformer.

Design parameter determination

Number of nozzles: 3 pieces of

Fluxing power: 3X 3.0MVA

Fuel medium: the natural gas P is 0.3-0.5 Mpa Q is 360NM3/h

Fluxing medium: oxygen P is 0.6-1.0 Mpa Q is 3 × 1000NM3/h

The equipment cooling water P is 0.3-0.4 Mpa Q is 20t/h

The main advantages are that:

a) function(s)

The multifunctional spray gun realizes the integration of scrap steel preheating, cutting melting, secondary combustion and temperature rise decarburization.

The carbon powder system realizes earlier, more uniform and more effective foam slag through multipoint and controllable injection.

Effectively utilizes chemical energy and reduces power consumption.

b) Process improvement

The system can provide the following process improvements to the operation of an EAF:

the epoxy injector uses a combustion chamber to mix and inject two streams of oxygen in a single injector body, thus ensuring the generation of a coherent jet. The combustor is designed to minimize injector plugging when a new protective flame stream is utilized. Because the injector has 2 combustion stages, a bright, high-speed ideal flame can be provided, thereby effectively introducing energy into the dynamically changing environment of the EAF;

unique computer flame-spraying flow program control software utilizes a multi-flame structure, and chemical energy can be effectively introduced into molten steel according to the smelting process requirements of different periods of furnace burden cutting and furnace burden melting;

more than 5 operation modes are set according to different furnace charge compositions, smelting processes, steel grade changes and other conditions;

the operation of the combustion system is fully automatic, and manual intervention is not needed in the normal smelting process;

carbon spraying can form good foam slag covering around the whole furnace wall;

the supersonic coherent jet is injected around the furnace wall at different point positions, so that the decarburization rate can be improved, the molten pool can be stirred better, the uniformity of temperature is ensured, and the mass transfer of slag/metal is promoted;

the use of a slag door lance/injector is reduced or eliminated. The slag door can be closed for a long time during operation;

the combination of the cluster injection box and the oxygen supersonic oxygen injector can realize the optimization of decarburization operation. During refining, oxygen penetrates the slag/steel interface to decarburize the molten steel. During the furnace burden melting and cleaning period, the system can introduce oxygen flow into a semi-molten bath, so that the decarburization process is accelerated, and more loose carbon powder can be utilized;

the ejector design requires a minimum amount of common media lines. Each injector only needs 2 pipelines with the diameter of 50mm, one is used for surrounding LPG, and the other is used for bundling jet oxygen and circulating oxygen; in addition, 2 water supply pipes (water supply and return) with a diameter of 25mm are required. This reduces the installation costs. The two oxygen streams mixed in the combustion chamber and producing a flame require only one oxygen supply tube, soft oxygen (i.e. epoxy) for post combustion of CO, and supersonic oxygen injection for decarburization of the molten steel.

C) Scrap preheating and melting

The introduction of chemical energy by using wall-mounted fixed oxygen burners is an improvement in the operation of electric furnaces, which can preheat, cut and melt scrap steel more uniformly, perform secondary combustion and improve the operation of foamed slag, but most of the oxygen burners have the common defect of unreasonable flame structures, most of the oxygen burners are extremely high temperature and pencil slender flames, have high heat flow, and are very easy to form a tubular cavity with a small diameter in the axial front of the flames, namely the so-called fusion tube effect, so that the effective heat transfer area of the scrap steel is reduced. In addition, the thermal efficiency of a 4MW oxygen burner of this type is typically no more than 35% because the tubular cavity easily directs hot gases into the central portion of the furnace and thus makes it difficult to effectively heat and melt the surrounding scrap.

The nozzle of the technology adopts a unique cavity shunting design and a two-stage combustion technology to generate wider oxygen wrapping jet flow, so that the technology ensures high convection and radiation heat conduction efficiency at the same time. Therefore, the average thermal efficiency of the nozzle applied to the electric furnace can reach more than 80 percent.

d) Decarburization of carbon

When the oxygen supply strength per ton of steel is 1 cubic meter/ton of steel per minute (i.e. the total oxygen amount is 2400 cubic meters/hour), the decarburization rate can reach 0.06-0.08%/minute when the carbon content in the furnace is more than 0.20%, and 0.03-0.04%/minute when the carbon content in the furnace is less than 0.20%.

The unique flame structure of the system allows for early decarburization. But when the carbon content reaches the critical value of 0.5 percent, the multi-point reaction and the high-efficiency beam oxygen injection can still maintain the high decarburization speed.

Technical characteristics

Low installation position, short jet stroke and large jet angle

The installation position is low, the distance from the liquid level of the molten steel is about 500-700mm, hot molten iron and residual molten steel can be fully utilized, and the formation of the foamed slag is advanced.

The jet flow stroke from the oxygen and carbon powder nozzles to the steel surface is only about 1000mm (700 mm and 1000mm shorter than other types), the oxygen injection efficiency is high, the ineffective free oxygen is less, and the decarburization speed is high.

The steeper oxygen injection angle (42-45) optimizes the impact of the jet on the bath. The splashing of the molten steel and the slag to the furnace top and the electrode is reduced. The jet impact point is far away from the electrode, so that the consumption of the electrode is reduced.

Simple and convenient installation and maintenance

Eliminates a furnace door oxygen lance and reduces the cost of maintenance and consumed parts

The number of common medium interfaces is small, each spray gun only has 1 oxygen and 1 LPG interface, the installation is easy, and the maintenance is easy and quick.

Environment-friendly

The furnace door is closed to reduce the suction of cold air, the free oxygen in the furnace is reduced, the smoke generated by the electric furnace is greatly reduced, and the performance of a dust removal system is improved.

The furnace door closing operation is realized, and the environment of an operation platform and the whole workshop is improved.

Others

Can reduce FeO in slag and improve the yield (+ 1-2%)

Main technical parameters

Oxygen:

air supply pressure: not less than 1.2-1.4MPa (gauge pressure)

Oxygen flow rate: 1000Nm3/h (Single oven gun)

Maximum oxygen flow: 3000Nm3/h

Cooling water:

flow rate: about 150m3/h

Water inlet pressure: not less than 0.4MPa

The water inlet temperature is as follows: less than or equal to 32 DEG C

Water outlet temperature: less than or equal to 50 DEG C

Carbon powder requirement:

carbon content: suitable carbon powder available at or in the locality

Volatile components: less than 1%

Ash content: less than 5%

Sulfur content: less than 1%

Granularity: not less than 0.1mm and not more than 2mm

Volume of the spray tank: 1000 liters

Carbon powder bin volume: 8m3

Consumption:

oxygen consumption 40-55Nm3/t (maximum)

The carbon powder consumption is 10-15kg/t

The amount of compressed air is 400Nm3/h

Installed capacity 5KW

It should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.

Claims (8)

1. A coherent jet oxygen lance is characterized by comprising an oxygen lance, a water-cooled wall, a valve station and a PLC control system,

gas enters the valve station from one end of a pipeline, the PLC control system controls the valve station, the other end of the pipeline is connected with an oxygen lance or a water-cooled wall,

the oxygen lance comprises a main oxygen channel, a gas channel and a combustion-supporting oxygen channel, the water-cooled wall comprises a water-cooled copper sleeve seat, the water-cooled copper sleeve seat is provided with a cooling water inlet, a cooling water outlet, a secondary combustion oxygen port and a carbon powder port, the oxygen lance is arranged above the water-cooled copper sleeve seat and is connected with the water-cooled copper sleeve seat, the top end of the oxygen lance is provided with an oxygen lance cover, the center of the oxygen lance cover is provided with an oxygen lance through hole, an oxygen lance pipe body is arranged below the oxygen lance cover, the oxygen lance pipe body is connected with the water-cooled copper sleeve seat, the main oxygen channel is arranged at the upper part of the center of the oxygen lance pipe body, the gas channel is arranged on the side wall of the oxygen lance pipe body, the combustion-supporting oxygen channel is arranged at the lower part of the center of the oxygen lance pipe body, the aperture of the combustion-supporting oxygen channel is, the side wall window is arranged between the combustion-supporting oxygen channel and the main oxygen channel.

2. The coherent jet lance of claim 1 wherein: the valve station comprises a first valve, a second valve, a third valve, a fourth valve, a fifth valve and a sixth valve, the PLC control system comprises a first controller, a second controller, a third controller, a fourth controller, a fifth controller and a sixth controller, the first valve is arranged on a first connecting pipeline of the main oxygen channel, the second valve is arranged on a second connecting pipeline of the gas channel, the third valve is arranged on a third connecting pipeline of the secondary combustion oxygen port, the fourth valve is arranged on a fourth connecting pipeline of the combustion-supporting oxygen channel, the fifth valve is arranged on a fifth connecting pipeline of the cooling water inlet, the sixth valve is arranged on a sixth connecting pipeline of the cooling water outlet, and the cooling water inlet is connected with the cooling water outlet through a cooling water channel, the cooling water passageway set up in the water-cooling copper sheathing seat, the cooling water passageway laminating combustion-supporting oxygen passageway, first controller control first valve, second controller control the second valve, third controller control the third valve, the fourth controller control the fourth valve, the fifth controller control the fifth valve, the sixth controller control the sixth valve.

3. The coherent jet lance of claim 1 wherein: the oxygen lance cover is provided with a plurality of mixed gas holes, an annular mixed gas belt is arranged below the mixed gas holes, the mixed gas holes are communicated with the annular mixed gas belt, and the gas channel and the combustion-supporting oxygen channel are communicated with the annular mixed gas belt.

4. The coherent jet lance of claim 3 wherein: the included angle between the central line of the mixed gas hole and the central line of the oxygen lance through hole is 42-45 degrees.

5. The coherent jet lance of claim 3 wherein: the mixed gas holes are formed around the oxygen lance through hole, and the mixed gas holes are uniformly formed in the radial direction.

6. The coherent jet lance of claim 5 wherein: and 12 mixed gas holes are radially arranged.

7. The coherent jet lance of claim 5 wherein: a plurality of mixed gas hole circumference sets up.

8. The coherent jet lance of claim 7 wherein: a plurality of mixed gas hole circumference sets up two circles.