JPH01500534A - Torch gunite spraying method for metallurgical units - Google Patents

Abstract

A method for torch guniting of a metallurgical unit, wherein a guniting force formed by a guniting mix, fuel and oxygen is directed into the refractory lining of the unit involved. Simultaneously the guniting torch is exposed in the effect of a wave energy field which is established by virtue of sonic vibrations which are maximally concentrated at the guniting torch.

Description

[Detailed description of the invention] Metallurgical unit torch gunite spraying method technical field The present invention relates to the metallurgical industry, more particularly to a method for torch gunite spraying of metallurgical units. do.

prior art Gunite spraying methods for refractory linings of metallurgical units are known in the current state of technology. In the method, a gonite spray mixture is fed into a torch through a nozzle; In this case, a direct current electric field is created between the refractory lining to be repaired and the nozzle ( For example, the official gazette.

Discoveries, Inventions, Industrial Designs and Trademarks Patent No. 12, Disclosed on March 30, 1982 (see USSR Inventor's Certificate No. 334.464).

When repairing using the method described above, the particles in the gunite blowtorch are charged with the same charge. During the formation of the gunite lining, electrostatic repulsion forces occur between the same charges. The result is a gunite spray coating on the foundation refractory lining. The density of the coating is lower and therefore the durability of the coating is lower.

Torch gunite spraying methods for the lining of metallurgical units are also known; In this case, a gunite blowtorch is formed with a gonite blowing mixture, fuel and oxygen. A gunite blowtorch is directed at the refractory lining of the unit, while a gunite blowtorch is 1. 0 to 20KI (Z.

exposed to the action of a wave energy field of frequency.

The wave energy field propagates throughout the interior space of the unit, and inside the wave energy field. act on gunite blowing torches located in USSR Inventor's Certificate No. 37 disclosed on October 7, 1980 in Zine and Trademark Patent No. 37 768,819).

In the gunite spraying method described above, the wave energy of the field is distributed throughout the internal space of the unit. As it propagates, only a relatively small amount of wave energy acts on the gunite blowtorch. . Therefore, within a gunite blowing torch, the strength of the effective wave energy field is too high. This creates an inappropriately strong combustion and heat exchange action within the gunite blowtorch. As a result, the $1 particle does not have enough time to burn completely during flight, and embedded within the sprayed coating and burned out on and within the coating. this This increases the porosity of the sprayed coating and therefore negatively affects the durability of the coating. make an impact. On the other hand, increasing the output of the energy source to the extent that the said effect is appropriately strengthened. This means that the harmful effects of the wave energy field acting on the metallurgical units and stand-up structures involved are impractical due to its negative effects.

Hikaruyu ■Tree 1 The present invention uses the wave effect on the gunite blowing torch to blow the fuel particles away in flight. Complete combustion can be achieved in a night blowing torch and hence the A metallurgical unit that can improve the durability of the sprayed layer. The purpose of this invention is to provide a spraying method.

A gunite blowtorch formed by a gonite blowing mixture, fuel and oxygen is involved. At the same time, a gunite blowing torch is directed at the refractory lining of the associated unit. to the method of torch gunite spraying of metallurgical units exposed to the action of a wave energy field. According to the present invention, the wave energy field is located at the position of the gunite blowing torch. The above purpose is achieved by forming a maximum concentration of sonic vibrations at It will be done.

directed along the geometric axis of the torch and passed through the ultrasonic whistle It is advisable to generate sonic vibrations with an oxygen jet.

Such a method of generating sonic vibrations allows for the simplest technical solution of the proposed method. can be provided at minimal cost.

located on either side of the geometric axis of the gunite spray F-chi, each with a maximum of 5 Two oxygen jets forming an angle of 0 degrees and passing through an ultrasonic whistle , it is no less advisable to form said sonic vibrations.

The direction of such sonic vibrations causes the gunite blowing torch to be within said vibrations to a maximum extent. can be surrounded by

It is best to send out sonic vibrations with a field strength of at least 100 dB.

With such intensity, almost complete combustion of the fuel particles occurs.

When the method of torch gunite spraying of metallurgical units is carried out according to the present invention, lower and help dramatically increase the durability of sprayed coatings by the simplest means. Become.

Side village ■mutual! A detailed description of specific embodiments of the invention will now be provided with reference to the accompanying drawings. on the drawing There, Figure 1 shows two examples of ultrasonic whistle arrangements, tuyere and metallurgical unit. This is an illustration of the refractory lining, and FIG. 2 is an enlarged view of unit A in FIG. 1.

Large ship± Metallurgical unit torch gunite spraying method is gunite 1 - spraying 1 - 3 using tuyere 2 to the refractory lining 1 (Fig. 1) of the metallurgical unit (not shown), Sonic vibration 1a in which the above 1.-ch is maximized at the position of the gunite blowing torch 3 It consists in simultaneous exposure to the energy field formed by T. Tuyere 2 is coaxial A gonite spraying mixture and fuel supply pipe 4 and an oxygen supply pipe arranged in 5 and a coolant supply pipe 6. Piping 4 is for the mixture and fuel for gonite spraying. The piping 5 is provided with a nozzle 7 for introducing oxygen. Ru. According to the first embodiment, the nozzle 8 has an ultrasonic whistle 9 (FIG. 2) and a flare. It is made with A10. In the above embodiment, the ultrasonic whistle 9 (Fig. 2) is Acid discharges along the geometric axis 'b' (Fig. 1) of the gunite spray torch. Sonic vibrations are formed by the elementary jet.

According to another embodiment, both the geometrical axes +b' of the gunai I and the spray torch 3 On the side, an ultrasonic whistle 11 (first Sonic vibrations are created by the oxygen jet passing through the ultrasonic whistle No. 11 is substantially similar to Heutsle 9, but the gonite spray mixture and fuel are The main part of the oxygen passes through nozzle 7, while most of the oxygen passes through nozzle 12. The only difference is that the minutes are solid. The proposed I-Tiganite spraying method was applied to cast iron and steel. Tested in a factory converter. For gunite spraying, contains refractory and fuel components, ordinary A two-component gonite spray mixture was used. Turn the converter vertically A spraying process was carried out. After discharging the steel and slag, bring the tuyere 2 into the converter, Begin supplying the gonite spray mixture to the nozzle and begin supplying oxygen to the nozzle 12. I met. Additional ultrasonic whistles 11 placed on both sides of nozzle 7 and nozzle 12 Oxygen/dioxide was supplied.

While passing through the whistle 11, the oxygen jet hits the shaft of the gunite blowing torch 13'. A sonic vibration was generated oriented at an angle of 30 degrees with respect to b'.

The combustion action of a fuel is carried out by the release of volatile substances, which, during burning, Envelops the fuel particles, thus preventing oxygen access to the fuel particles. As a result, the above Vigorous combustion of fuel particles occurs after the volatiles are burned out. gunite spray toe When the channel 3 is exposed to the action of concentrated acoustic vibrations, the energy of the resulting acoustic field is is sufficient to vibrate the volatiles and solids in the fuel particles, resulting in Facilitates the entry of oxygen and strengthens the combustion action within the gunite blowing torch. fuel particles burns out during flight, dramatically reducing the pore content of the resulting lining. On the other hand, Volatile substances pass through the refractory particles, thereby enhancing the heat exchange action within the gunite blowtorch. In addition to the improved and low content of pores, the quality of the resulting sprayed lining is better.

Using an additional jet of oxygen to form the sonic vibrations Oxygen supplied also takes part in the combustion process, so it can be used without any other energy source. It becomes possible to obtain the vibration with sufficient output without wasting energy.

Comparison test between the known method and the torch gunite spraying method of the metallurgical unit proposed here. Test was carried out. The results of the test are shown in the table below.

Item number Gunite spraying method Strength linei Notes Leveling dB Wear rate 1 Soviet inventor's certificate 30.2 Inning with high pore content No. 334464 but (DC electrical field).

2 Soviet inventor certificate 20.4 Energy field No. 768819 for all units Expansion (Wave energy dissipated. Field advantage Field) Usage efficiency is about 2% It is a low degree.

3 By the method of the present invention [100], 5.1 High quality spraying (gunite spraying 110 10.2 Maximum at torch position with lining 120 9,6i, l It was done.

Sound waves concentrated at 130 8.9 Vibration) 140 6.3 As can be seen from the data in the table above, a concentrated field characterized by a field strength of at least 100 dB By exposing the gunite blowing torch to the action of sonic vibrations, a high quality lining is produced. Can be attached. The wear rate of linings attached using the proposed method has been The wear rate is less than a factor of that of linings applied by known methods. Before From the above table, the application of gunite spray lining ranges between 140dB and 165dB. It is clear that under the action of sonic vibrations with a level of intensity that .

Production of 11 Tomo 1 The present invention applies to converters, arc furnaces for steelmaking, open hearths, ladle and other steelmaking units. It is most conveniently applied to hot repair or modification of innings.

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Claims (4)

[Claims] 1. Gunite spray torch (3) formed with gunite spray mixture, fuel and oxygen ) to the refractory lining (1) of the related unit and spray gunite at the same time. Torch gun of a metallurgical unit, where the torch (3) is exposed to the action of a wave energy field In the gunite spraying method, the sound is maximized at the gunite spraying torch (3) position. A torch gunite blower characterized by forming a wave energy field by wave vibration. Attachment method. 2. directed along the geometrical axis (b) of the gunite blowtorch (3), and Sonic vibrations are created by an oxygen jet passing through an ultrasonic whistle (9). 2. A method according to claim 1, characterized in that: 3. located on both sides of the geometrical axis (b) of the gunite spray torch (3), each with a Two oxygen jets forming a maximum angle of 50 degrees with the axis are passed through the ultrasonic whistle 11. 2. A method as claimed in claim 1, characterized in that sonic vibrations are created by: 4. Features that acoustic vibrations are transmitted at a field strength level of at least 100 dB The method according to any one of claims 1 to 3, wherein: