JPS597911B2 - flame spray lance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to hot coating technology, and more particularly to lances for flame spraying or thermal spraying metallurgical unit linings.

DISCLOSURE OF THE INVENTION The quality of thermal spray construction for metallurgical unit linings has become more demanding.

flame spraying lance
ce) (German Patent No. 2 200 667, issued May 13, 1976) is known, the lance of which is formed with a conduit for supplying powdered refractory material mixed with fuel and for passing oxygen. The casing consists of a water-cooled casing, by means of which a refractory material, which is heated in a hot flame to a plastic state, is deposited on the lining surface.

The water-cooled casing and the conduits supplying the powdered refractory material mixed with fuel and oxygen are bent at an angle of 15 to 300 with respect to a plane perpendicular to the axis of the nozzle. Note that the nozzle is located at the end of the conduit and is oriented at right angles to the conduit.
A device constructed in this manner allows good deposition of refractory material within the metallurgical unit lining. However, the practical application of this lance for flame spraying is problematic. A single nozzle reduces the work efficiency of the lance,
Flame spraying takes time. Furthermore, the curved lance is complex in its construction, making the operations necessary to carry the lance in and out of the metallurgical unit difficult.

It should be noted that curved conduits supplying the mixture of powdered refractory material and fuel will cause very severe wear and tear, reducing the service life of the lance.

It should be noted that the powdered refractory material, fuel and oxygen are mixed only after exiting their respective nozzles.

Refractory - The fuel and oxygen are supplied in parallel injections so that the flame spreads a considerable distance from the nozzle while the mixing proceeds at a very slow rate. When the water-cooled casing and the concentric conduits formed in it are made into a curved shape, they are oriented tangentially to the plane of the metallurgical unit lining, which ensures reliable thermal spraying of the refractory material particles onto the lining. There's not enough power. As a rule, a considerable amount of part of the powdered refractory material is discharged with the exhaust gas. Other known flame spray lances (19
(1977 Moscow Metallagia Publication Metallurgical Journal No. 12, pages 25-26) from a water-cooled casing formed with concentrically arranged conduits supplying a mixture of refractory material and fuel and supplying oxygen. Become.

The powdered refractory material-fuel mixture and oxygen are injected through several nozzles (eg five) perpendicular to the plane of the metallurgical unit lining. This type of lance is simple in construction and reliable in operation because the conduit and water-cooled casing are uncurved. It is possible to slightly improve the quality of the refractory coating by applying the flame at right angles to the metallurgical unit lining. Despite certain advantages of the above lances as opposed to single nozzle curved lances, there is still no solution to the problem of increasing the utilization of refractory material in the lining deposit and producing commercial quality refractory coatings.

The refractory material-fuel mixture and oxygen are supplied in lances of the type that use parallel injection, but the effect of mixing is slow.

As a result, the refractory material-fuel mixture and oxygen are mixed and ignited just before hitting the lining of the metallurgical unit. The fuel begins to burn in the area of flame impingement and continues to burn as the flame moves along the lining. As a result, some refractory materials do not heat to a plastic state and do not form a strong bond with the lining. Instead, a quantity of refractory material is discharged from the metallurgical unit along with the combustion gases. DISCLOSURE OF THE INVENTION It is therefore an object of the present invention to obviate the above-mentioned disadvantages.

The present invention aims to improve the quality of gunite deposited in metallurgical unit linings, to reduce the amount of refractory material emitted with exhaust gases, to reduce thermal spraying time and to reduce the amount of refractory material, fuel and A lance for flame spraying a metallurgical unit lining having a nozzle arranged to increase oxygen availability.

The purpose is to concentrically arrange a pipe 4 supplying a powdered mixture of refractory material and fuel and an annular duct supplying oxygen between said pipe 4 and a pipe 3 which is external to said pipe 4. According to the invention, in a flame spray lance comprising a water-cooled casing, the outlet of the conduit having a nozzle for distributing a refractory material-fuel mixture and for distributing oxygen; - the fuel mixture dispensing nozzle and the oxygen distributing nozzle are arranged in pairs along the conduit, each pair being coaxially arranged, the end face of the refractory material-fuel mixture dispensing nozzle comprising: located below each oxygen dispensing end face and at a distance of 1 to 5 times the inner diameter of the nozzle dispensing the refractory material-fuel mixture, one of each pair of nozzles dispensing the refractory material-fuel mixture generally or This is achieved in that the part has a shape other than a cylinder.

The construction of the lance nozzle makes it possible to provide a direct flow of refractory material, fuel and oxygen that is more utilized, and the fuel is combusted and the refractory material particles are heated to the desired temperature. A region can be located in the space between the lance and the metallurgical lining surface, which ultimately improves the quality of the gunite deposited on the metallurgical unit lining and reduces the gunite spraying time. The flame spray lance according to the invention is structurally simple and operationally reliable. Furthermore, the present invention makes it possible to use the nozzle of a flame spray lance to improve the mixing of the refractory material-fuel mixture and oxygen inside the oxygen nozzle. This mixing, in turn, is more intense than that produced by parallel injection. Instead, the fuel is ignited in close proximity to the outlet where the refractory material and fuel exit, thereby improving the quality of the deposited gunite and reducing the amount of refractory material emitted with the exhaust gases. Increase fuel and oxygen utilization. Furthermore, the construction of the lance nozzle according to the invention enhances the mixing of the fuel, oxygen and refractory material, hastens the ignition, allows the fuel to burn and the suction of hot gases from the converter space or the refractory material - fuel and oxygen. The intense mixing of the refractory material particles can shorten the area in which the refractory material particles are heated within the flame. This brings the fuel ignition boundary closer to the nozzle dispensing the refractory material and fuel mixture. The high velocity combustion heats the refractory material particles inside the flame to a plastic state before they hit the surface of the metallurgical unit lining. Already in a plastic state, the particles of refractory material impinge on the lining of the metallurgical unit. Also, due to its plastic state, the refractory material is less likely to escape with exhaust gases and is therefore used more frequently. Another advantage is that heat-softening particles of the refractory material are emitted onto the lining, thereby improving the quality of the protective coating. In the flame spray lance, each nozzle for oxygen distribution preferably has an elliptical cross section.

This accelerates the ignition of the fuel in two opposing regions of the flame located along the minor axis of the ellipse.

Preferably, each nozzle for dispensing a powder mixture of refractory material and fuel is provided with a transverse groove on its outer surface, said groove extending at the very end of the gap between the refractory material-fuel mixture nozzle and the oxygen distribution nozzle. Preferably, the depth is equal to 0.8 to 1.2 times the narrow width. The grooves slow the flow of oxygen due to the narrow space between the nozzles and reduce the distance over which the fuel and oxygen mix and the fuel ignites.

In the operation of flame spray lances, each nozzle for refractory material and fuel is preferably provided with longitudinal internal and external grooves;
The inner and outer grooves are at an angle of 5° to 2° to the central axis of the nozzle.
It has a wedge shape at an angle of 0° and is flared in the longitudinal direction.

This improves mixing of the ingredients and enhances combustion and heat exchange in the flame, improves the quality of the refractory material coating, and minimizes the release of refractory material from within the metallurgical unit. This type of nozzle is advantageously used for gunite spraying large metallurgical units requiring long flame spray ranges.

Each nozzle for distributing refractory material and fuel in a flame spray lance is formed by a slit having a width equal to between 0.1 and 0.3 times the width of the nozzle and a height greater than or equal to the inner diameter of the nozzle. Advantageously, the slots can be provided with slits oriented tangentially.

It is possible to more intensively mix the refractory material, fuel and oxygen in the proportions necessary for combustion at the very end of the nozzle dispensing the powder mixture of refractory material and fuel. Furthermore,
Equipment of this construction reduces the combustion zone, increases the dispersion of heat per unit volume of flame, and makes it easier to spray gunite on linings in small metallurgical units and on downward facing surfaces such as loops in steelmaking units. contribute to Another requirement of a flame spray lance is that each oxygen distribution nozzle is divided into two parts, the bottom one of which has an elliptical cross-section, and the opposite four parts. It is on a semicircular arc and oriented tangentially to the nozzle dispensing the powder mixture of refractory material and fuel.

Such devices enhance the mixing of oxygen, fuel, and refractory material, ignite the flame close to the end of the nozzle dispensing the refractory material and fuel mixture, and create a short flame;
By intensifying the heating process and delivering a more uniform composition through the flame, the quality of the gunitized lining is improved and the carryover of refractory material from the metallurgical unit is reduced.

Another improvement in flame spray lances is to provide a conical shell with the bottom inwardly located inside and a short distance from each nozzle that distributes the oxygen.

The purpose of the conical shell is to further enhance the mixing of refractory material, fuel and oxygen, and to improve the spread angle and flame smoothness in the proportions necessary to ignite the fuel as soon as it exits the conical shell outlet. It is an object of the present invention to provide a means for adjusting over a wide range to improve the uniformity of gunite spraying and to enable small metallurgical units to be sprayed with gunite.

The construction of the flame spray lance is such that near the nozzle for dispensing the powder mixture of refractory material and fuel, and near each opening at the bottom of the oxygen distribution nozzle, one face of the insert is attached to the inner surface of the respective opening. A further improvement is achieved by attaching a wedge-shaped insert following the .

This structure effectively rotates the oxygen flow, improves the mixing of fuel, oxygen, and refractory materials, and reduces the fuel combustion zone.
Improves heating of refractory materials in flames.

[Brief explanation of the drawing]

The invention will be explained by way of example with reference to the accompanying drawings. FIG. 1 schematically shows a part of a lance in which a nozzle outlet according to the invention is arranged. FIG. 2 is a cross section of FIG. 1. FIG. 3 is a main axis cross section of the elliptical oxygen supply nozzle of the lance shown in FIG. FIG. 4 is a longitudinal section through the outlet area of a nozzle according to the invention with grooves arranged obliquely in the solid axis of said nozzle. FIG. 5 is a plan view of the end face of the nozzle. FIG. 6 is a - cross section of FIG. 5. FIG. 7 shows a cross section of a flame spray lance with a slit in the nozzle according to the invention. FIG. 8 is a - cross section of FIG. 7. FIG. 9 is a cross section of FIG. 8. FIG. 10 shows a cross-section of a lance in which the nozzle according to the invention is divided into two parts. Figure 11 is the 10th
It is a cross section taken along the line MM in the figure. FIG. 12 is a cross section of FIG. 10. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The flame spray lance (FIGS. 1 and 2) comprises a water-cooled casing with pipes 1 and 2 for supplying oxygen and a mixture of powdered refractory material and fuel, respectively. Pipes 3 and 4 are arranged concentrically. A conduit between pipes 1 and 2 supplies water. A conduit between pipes 1 and 2 allows cooling water to drain. Oxygen pipes 3 and 4
A mixture of refractory material and fuel is fed from the central pipe 4. The pipe 4 is equipped with a nozzle 5 for dispensing a powder mixture of refractory material and fuel. A nozzle 6 for distributing oxygen is installed on the pipe 3 concentrically with the nozzle 5. the end of each nozzle 5 dispensing the powder mixture of refractory material and fuel at a distance L equal to 2.5 times the internal diameter d of the nozzle 5 dispensing the powder mixture of refractory material and fuel; and located below each nozzle 6 distributing oxygen. The distance L may vary from 1 to 5 times the inner diameter d of the nozzle 5. If this distance is smaller than 1 d, the interaction effect of the jets in the gap between the ends of nozzles 5 and 6 can be ignored. In contrast, if this distance is greater than 5d, the nozzle 6 will be damaged by the refractory material carried out into the peripheral area of the jet before it leaves the nozzle 6. The nozzle 6 for distributing oxygen may have a cross-sectional shape other than cylindrical. 1st
, 2 and 3, the nozzle distributing oxygen is of elliptical cross section. The main axis of the elliptical nozzle 6 is aligned with the axis of the pipe 3. The nozzle 5 for dispensing the powder mixture of refractory material and fuel is provided on the outside with a groove 7 of a depth h equal to the minimum width of the gap between the nozzles 5 and 6. In practice, the depth h of the groove T can be between 0.8 and 1.2 times the minimum width of the gap between the nozzles 5 and 6. If the depth h of the groove T is smaller than 0.8 times the minimum width of the gap between nozzles 5 and 6, the narrow cross-section oxygen injection cannot be effectively delayed; A depth h of the grooves 7 greater than 1.2 times the minimum width of the gap therebetween can significantly retard the flow of oxygen. Figures 4, 5 and 6 show a nozzle 8 for dispensing a powder mixture of refractory material and fuel, the nozzle 8 widening longitudinally towards the end of the nozzle 8, which is wedge-shaped in cross-section. Therefore, 1 for the solid axis
An internal groove 9 (FIG. 5) and an external groove 10 having angles α and β of 8 are provided. The angles α, β of the wedge-shaped grooves are between 5 and 25 to match the size of the metallurgical unit, including the thermal and physical properties and the size of the refractory material, the physicochemical properties and the size of the fuel.
It's between Yu. For grooves inclined at angles α and β smaller than 5°, it is possible that the interpenetration of the component jets is negligible, while for angles α and β larger than 25°, the wedge-shaped jets of one component will penetrate the other. penetrates the jet of components and emerges from the flame. The nozzle 11 distributing the oxygen is cylindrical in this embodiment. Nozzle 8 for dispensing a powder mixture of refractory material and fuel
The end face of is located inside the oxygen distribution nozzle 11 at a distance L from the end face equal to 2.5 times the internal diameter of the nozzle 8.
Figures T, 8 and 9 show a lance structure in which a nozzle 1 for dispensing a powder mixture of refractory material and fuel
2 is provided with a slit 13, while the oxygen distribution nozzle 14 is cylindrical in cross section. the slit 13 has a width b equal to 0.2 times the inner diameter of the nozzle 12 dispensing the powder mixture of refractory material and fuel;
and the height H is 2 of the nozzle 12 dispensing the powder mixture.
Equal to times the inner diameter. The slit 13 is tangential to the inner surface of the nozzle 12. The width of the slit 13 may vary between 0.1 and 0.3 times the inner diameter of the nozzle 13 dispensing the refractory material and fuel powder mixture and as required to rotate the components in the injection. It makes no sense to manufacture the slit 13 with a width smaller than 0.1 times the inner diameter d of the nozzle 12 dispensing the powder mixture. This is because the amount of oxygen entering the nozzle 12 dispensing the powder mixture of refractory material and fuel is insufficient, so that the rotationally actuated injection is too weak. Increasing the width of the slit 13 to more than 0.3 times the internal diameter d of the nozzle 12 for dispensing the powder mixture of refractory material and fuel results in a considerable increase in the internal pressure of the nozzle for dispensing the mixture of refractory material and fuel. and thus inhibit the flow of the powder mixture of refractory material and fuel. slit 1
3 is 0.2 times the inner diameter d of the nozzle 12 dispensing the powder mixture of refractory material and fuel. The optimum height H of the slit 13 illustrated in FIG. 9 is equal to twice the inner diameter of the nozzle 12 dispensing the refractory material and fuel mixture. If the height H of the slit 13 is smaller than the inner diameter d of the nozzle 12 dispensing the mixture of refractory material and fuel, the nozzle 12
The amount of oxygen entering the engine is insufficient to achieve the desired rotational injection. For a height H of the slit 13 greater than five times the inner diameter d of the nozzle 12 dispensing the powder mixture of refractory material and fuel, the amount of oxygen in the nozzle 12 increases so that the powder mixture of refractory material and fuel increases the resistance of the conduit against the powder mixture and reduces the flow rate of the powder mixture. Figures 10, 11 and 12 show the construction of a lance in which each nozzle 15 for distributing oxygen is divided into two parts, the bottom part 16 of which is elliptical in cross-section and opposite quarter arcs. an opening 17 located above and oriented tangentially to a nozzle 19 dispensing the powder mixture of refractory material and fuel;
and 18 (FIG. 11) are provided. To simplify the structure, the nozzle bottom 16 is fitted with plates 20, 2.
It may be equipped by 1. Each nozzle 15 for distributing oxygen has a conical shell mounted at some distance from its end with a small conical base on the inside. A wedge-shaped insert 23 is located near each nozzle 19 dispensing the powder mixture of refractory material and fuel;
are provided near the openings 17 and 18 in the bottom 16 of the oxygen distributing nozzle 15 such that the surface of the nozzle 15 follows the inner surface of the respective opening 17 or 18. The bottom 16 of the nozzle 15 distributing oxygen is oval shaped;
Two openings 17 and 18 located on opposite quadrant arcs
, so that the oxygen stream entering the gap between the nozzle 15 for distributing oxygen and the nozzle 19 for dispensing the powder mixture of refractory material and fuel has a rotational movement around the nozzle 19. Insert 23 prevents oxygen flowing from openings 17 and 18 from circulating around nozzle 19 in the opposite direction. This is the nozzle 1 that dispenses the powder mixture of refractory material and fuel.
9 increases the spiral nature of the oxygen flow. The flame spray lance operates in the following manner. Prior to the spraying operation, lance cooling water is supplied and the flamethrower lance is pushed inside the metallurgical unit to be sprayed. The lance has its nozzles 5 and 6 (Figs. 1, 2 and 3) in the area of the metallurgical unit lining to be repaired (not shown).
It is placed so that it hits the A powder mixture of refractory material and fuel is fed through a central pipe 4 and a nozzle 5. At the start of radiation, the flow rate of the powder mixture of refractory material and fuel is set at 20-25% of the nominal value. Oxygen is then supplied through the conduit between pipes 3 and 4 and through the conduit between nozzles 5 and 6. The oxygen flow rate is also adjusted to completely burn the fuel supplied from the nozzle 5 as a component of the powder mixture together with the refractory material. Once the fuel has been ignited, the flow rates of the oxygen and powder mixture of refractory material and fuel are adjusted as desired and the refractory material is delivered to the area of the metallurgical unit lining to be repaired by appropriate movement of the flame jet. be done. The powder mixture of refractory material and fuel exits as a solid axisymmetric jet, while the oxygen exits from the conduit between nozzles 5 and 6 as a tubular jet concentric to the central jet of refractory material and fuel. Since the end face of nozzle 5 is inside nozzle 6 at a distance equal to L, the jets interact in the gap created by the walls of nozzles 5 and 6. This improves mixing of the ingredients. 1st, 2nd and 3rd
In the flame injection lance with the nozzle shown in the figure, the oxygen injection orifice has an elliptical cross section, and the refractory material and fuel injection orifices are in the center thereof. The thickness of the oxygen jet is minimal in the plane of the minor axis of the ellipse. The effect of the weak oxygen injection is to mix the fuel and oxygen in the proportions necessary for ignition and shorten the distance over which hot gases can be absorbed from the metallurgical unit space. Grooves 7 on the outer surface of the nozzle 5 retard the flow of oxygen in these two areas and facilitate ignition of the fuel. A combination of oxygen and an elliptical cross-section of a powder mixture of refractory material and fuel ignites on two sides of the nozzle. Combustion then continued in the direction of the flame flow in the region between the two-phase injection of refractory material and fuel and the tubular injection of oxygen. The initially elliptical jet also becomes round. As the cross-sectional shape of the jet changes, the components mix intensively, and the flame-like combustion process enhances the mixing.
The particles of refractory material are heated to a plastic state in a high temperature flame and bond strongly with the lining of the metallurgical unit. The service life of this skin is increased by 4 to 5 heats, approximately 20%, compared to the service life of a skin obtained from a central circular injection of solid components and a tubular injection of oxygen. Lances with nozzles of this design are advantageously used for spray linings of medium-sized metallurgical units. In this unit the distance between the end of the nozzle and the lining surface is 2 to 3 m. The ingredients are fed through the nozzles of Figures 4, 5 and 6, and the powder mixture of refractory material is dispensed through the nozzle 8, which has a circular inlet and a star shape at the outlet? ). The cross-sectional area of the wedge-shaped conduit increases in the exit direction. The oxygen in this case is supplied through the annular gap between the nozzles 8 and 11, the outlet of which is provided with a wedge-shaped groove whose cross-sectional area increases in the direction of the outlet. The two-phase injection of fuel and refractory material flowing out of the injection port 8 spreads laterally due to the increase in the cross-sectional area of the groove, but this spread is characteristically narrow. Since the cross-sectional area of the outer wedge-shaped groove increases in the direction of the outlet, the oxygen flowing through the annular gap also spreads out. At the outlet from the tubular gap, the oxygen flowing through the wedge-shaped groove penetrates at a given angle a two-phase injection of refractory material and fuel flowing through the wedge-shaped inner groove of the nozzle 8. Some of the two-phase injection instead penetrates the oxygen injection to strongly mix the components. A part of the cross section of the central injection is filled with oxygen and part of the refractory material and fuel is transferred to the peripheral area of the injection orifice. Contact of the fuel with the hot gases in the working space of the metallurgical unit causes ignition and rapid combustion. Particles of refractory material are heated to a plastic state in a high temperature flame and sprayed onto the metallurgical unit lining at a rate sufficient to form a strong coating. The service life of this coating is 20% longer than that of a coating formed using a nozzle that delivers the components in parallel jets. Nozzles of the design shown in FIGS. 4, 5 and 6 are most advantageous for gnating large metallurgical units where the distance between the lance and the lining surface is 3 to 4 meters. Chapter T, 8
and for a nozzle designed as shown in FIG.
The powder mixture of refractory material and fuel is supplied through a central circular nozzle 12 and the oxygen is supplied through a nozzle 12 dispensing the powder mixture of refractory material and fuel and a nozzle 14 dispensing oxygen.
is fed through a tubular gap between. A feature of this design is that before the refractory material and fuel leaves the nozzle 12, it is fed into a conduit distributing the mixture through a slit 13 in the wall of the nozzle 12 distributing the mixture. It is. Providing oxygen within the powder mixture of refractory material and fuel improves the mixing of the components. The oxygen injection from the slit 13 is faster than the rate of the solid component two-phase injection and imparts a rotational motion to the powder mixture of refractory material and fuel. The rotational motion causes intensive mixing of the fuel, refractory material and oxygen. Exiting the nozzle 12, the rotating two-phase jet of solid components moves forward and spreads laterally by centrifugal force, penetrating the tubular jet of oxygen. Nozzle 12
and the lateral component injected from 14. The movement causes rapid mixing of oxygen, fuel and refractory material. The fuel ignites when it comes into contact with the hot gas from the workspace, causing nozzle 1
It burns as a short, high-temperature flame near 4. The temperature, speed and component concentration fields in the rotating frame effectively average out so that particles of refractory material having equal temperature and speed form a better bond against the lining. The rotation of the flame around the axis also increases the penetration of particles into the lining of the metallurgical unit. The service life of this coating is increased by approximately 20% compared to a linear distribution of components, thereby increasing the proportion of refractory material actually bonded to the metallurgical unit lining by 10 to 20%. Lances having nozzles shown in FIGS. T, 8 and 9 are used effectively in hot coating large and relatively small metallurgical units. When guniting large units, a limited amount of oxygen is supplied to the central nozzle 12. This amount increases when smaller units are gunitized. 10th
, 11 and 12, the powder mixture of refractory material and fuel is injected through a conduit between nozzles 19 and 15 in the form of a symmetrical two-phase injection with rotationally injected oxygen. Supplied. Before exiting the nozzle, the mixture of refractory material, fuel and oxygen is vigorously mixed in the shell 22
passed through a narrow cross-sectional area. The oxygen distributed tangentially to the nozzle 19 through the two orifice-like openings IT and 18 requires a rotational movement. In the space between the end face of the central nozzle 19 and the shell 22, the rotary jet interacts with the two-phase jet of the powder mixture of refractory material and fuel into a rotary motion. Once inside the narrow cross-section shell 22, the powder mixture of oxygen, refractory material, and fuel mixes intensely due to the rotational movement of the components and the perpendicular penetration of the oxygen into the refractory material-fuel mixture. The mixture of refractory material, fuel, and oxygen exiting the outlet of shell 22 is sufficiently formulated to ignite. In contact with the hot gases in the working space of the metallurgical unit, the fuel ignites near the outlet and burns. The process is completed in a small volume. This lance structure is ideal for nitrating small metallurgical units. Additionally, this type of lance is used for flame spraying overlooking surfaces such as open hearth loops. The effectiveness of these lances in gunitizing open hearth loops is to increase their service life by 35%. Industrial Applicability The lance according to the invention is used for the repair of metallurgical unit linings and various other applications in the metallurgical and mechanical construction industries. However, the most advantageous field of application of the invention is in the case of hot repairs of metallurgical units where the temperature of the lining is above the flash point of the fuel. For example, as long as the lining temperature is in the range of 1200 to 1400°C, the converter lining is most likely to be repaired immediately after tapping and slugging. The lance according to the invention is used for repairing cylindrical metallurgical units such as converters and steel pouring ladles. Additionally, the flame gnitizing lance may be used to gnitize flat surfaces, including downwardly facing flat surfaces such as sidewalls and loops in steelmaking, heating, and other types of furnaces.

Claims (1)

[Claims] 1. A pipe 4 for supplying a powdered mixture of refractory material and fuel, and an annular duct for supplying oxygen between the pipe 4 and a pipe 3 located outside of the pipe 4. In a flame spray lance comprising a water-cooled casing concentrically disposed with a water-cooled casing, the outlet of the pipe having a nozzle for distributing a refractory material-fuel mixture and distributing oxygen; The nozzles 5 for dispensing the mixture and the nozzles 6 for distributing the oxygen are arranged in pairs along the pipes 3 and 4, each pair being arranged coaxially, each nozzle 5 distributing the refractory material-fuel mixture. The end face is below the end face of each nozzle 6 distributing oxygen and the refractory material -
located at a distance of 1 to 5 times the inner diameter of the nozzles dispensing the fuel mixture, at least one of each pair of nozzles 5 or 6 having a shape other than a cylinder, partially or wholly; A flame spray lance featuring 2. The flame spray lance according to claim 1, wherein each nozzle 6 for oxygen distribution has an elliptical cross section. 3. Preferably, each nozzle 5 for dispensing a powder mixture of refractory material and fuel is provided with a groove on its outer surface, which groove extends in the gap between the nozzle 5 for the refractory material-fuel mixture and the nozzle 5 for oxygen distribution. 2. A flame spray lance as claimed in claim 1, characterized in that the groove is provided with a depth equal to 0.8 to 1.2 times the minimum width. 4. Each nozzle 8 for dispensing a powder mixture of refractory material and fuel is provided with a wedge-shaped cross-section, flaring along the end direction of the nozzle 8 and at an angle of 5° to 20° with respect to the central axis of said nozzle 8. 2. A flame spray lance as claimed in claim 1, characterized in that there are alternating inner grooves (9) and outer grooves (10) forming an angle of .degree. 5. each nozzle 12 dispensing refractory material and fuel has a width between 0.1 and 0.3 times the inner diameter of the nozzle 12;
The nozzle 1 is a slit 13 having a height equal to or greater than the inner diameter of the nozzle 12 for dispensing a powder mixture of refractory material and fuel.
2. The flame spray lance according to claim 1, wherein a tangentially oriented slit (13) is provided on the inner surface of the flame spray lance (9). 6. Each nozzle 15 for oxygen distribution is divided into two parts, one of the lower parts 16 of which has an elliptical cross-section and has walls on opposite quadrant arcs; 2. Flame spray lance according to claim 1, characterized in that two tangentially oriented openings 17 and 18 are arranged in the nozzle 19 for dispensing the powder mixture of refractory material and fuel. 7. A conical shell 22 according to claim 6, characterized in that a conical shell 22 is arranged inside each nozzle 15 distributing oxygen at a short distance from its end face with the bottom of said shell 22 facing inward. Flame spray lance. 8 The construction of the flame spray lance includes one of the inserts near the nozzle 19 dispensing the powder mixture of refractory material and fuel and near each opening 17 and 18 in the lower part 16 of the oxygen dispensing nozzle 15. 8. A flame spray lance according to claim 6, characterized in that the wedge-shaped insert (23) is arranged so that its surface follows the inner surface of the respective opening (17, 18).