CA1264612A - Method for torch guniting of a metallurgical unit - Google Patents
Method for torch guniting of a metallurgical unitInfo
- Publication number
- CA1264612A CA1264612A CA000528381A CA528381A CA1264612A CA 1264612 A CA1264612 A CA 1264612A CA 000528381 A CA000528381 A CA 000528381A CA 528381 A CA528381 A CA 528381A CA 1264612 A CA1264612 A CA 1264612A
- Authority
- CA
- Canada
- Prior art keywords
- guniting
- torch
- oxygen
- unit
- fuel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
METHOD FOR TORCH GUNITING OF A
METALLURGICAL UNIT
Abstract of the Disclosure A method for torch guniting of a metallurgical unit, wherein a guniting force formed by a guniting mix, fuel and oxygen is directed onto the refrac-tory lining of the unit involved. Simultaneously the guniting torch is exposed to the effect of a wave energy field which is established by virtue of sonic vibrations which are maximally concentrated at the guniting torch.
METALLURGICAL UNIT
Abstract of the Disclosure A method for torch guniting of a metallurgical unit, wherein a guniting force formed by a guniting mix, fuel and oxygen is directed onto the refrac-tory lining of the unit involved. Simultaneously the guniting torch is exposed to the effect of a wave energy field which is established by virtue of sonic vibrations which are maximally concentrated at the guniting torch.
Description
The present invention relates to metallurgical industry and more specifically to methods for torch guniting of metallurgical units.
The invention is most expedient to be applied for repair or reconditioning of the lining of con--verters, steel-making arc furnaces, open-hearth fur-naces, ladles and other steeI-making units when under a hot condition.
Known in the present state of the art is a method for guniting the refractory lining of metal-lurgical units, wherein the gunite mix is fed, via a nozzle, into a torch, whereupon a d.c. electric field is established between the nozzle and the refractory lining to be repaired (cf., e.g., USSR
Inventor's Certificate No. 334,464 published on March 30, 1982 in Bulletin No. 12 "Discoveries, in-ventions, industrial designs and trade marks").
When repairing by said method the particles in the guniting torch are charged with like charges so that electrostatic repulsive forces are partially acting bet~een the like charges during formation of a gunited coating, which results in a lower density of the gunited coating with respect to the base re-fractory lining and hence in a lower durability of said coating.
:
,r . - , ,: ... , .. .~, , ~., ~ , -.~ . . .. . . .
-, ~6D~6~2~
There is also known a method for torch gunit-ing of the lining of a metallurgical unit, wherein a guniting torch formed by a guniting mix, fuel and oxygen, is directed onto the refractory lining of the unit, while the guniting torch is exposed to the effect of a wave energy field having a frequency of from 1.0 to 20 kHz.
The wave energy field propagates over the entire interior space of -the unit and acts upon the guniting torch located therein (cf., e.g., USSR Inventor's Certificate No. 768,819 published on October 7, 1980 in Bulletin No. 37 "Discoveries, inventions, indus-trial designs and trade marks").
In the aforesaid method of guniting the wave energy of the field is spread over the entire in~
terior space of the unit so that but a relatively small proportion of it acts upon the guniting torch, Hence inadequate intensification of the burning and heat-e~change processes occurs in the guniting torch due to too low intensity of the field effective there-in, with the result that fuel particles have not time enough to burn completely in the course of flight, get embedded in the gunned coating being applied and burn down on the surface of the coating and inside it. This in turn increases the porocity (void con-tent) of the gunned coating and hence affects adversely ~ :. - : :
,: : , : .
, , - .~ ~ ., its durability. On the o-ther hand, any increase in the power of a source of the energy field -to such an extent that would provide an adequate intensifi-cation of the aforesaid processes is not practicable due to a harmful effect of the field upon the me-tal-lurgical unit involved and -the attending personnel.
It is a primary and essential objec-t of the present invention to provide a gunned coating possessing higher durability.
Said object is accomplished due to the fact that in a method for torch guniting of a metallur-gical unit, wherein a guniting torch formed by a guniting mix, fuel and oxygen, is directed onto the refractory lining of the unit involved, while the guniting torch is simultaneously exposed to the effect of a wave energy field, according to the invention, said wave energy field is established by virtue of sonic vibrations maximally concentrated at the guniting torch.
It is expedient that sonic vibrations be de-veloped by virtue of an oxygen jet directed along a geometric axis of the torch and passed through an ultrasonic whistle.
Such a way of developing sonic vibrations enables the simplest technical solution of the proposed method to be applied at minimum costs.
_ 4 _ : : "''"
;.; ,, , : ,:,,, .. . ..
" ~
, . .
~2~;~6~
It is not less expedient that said sonic vibrations be established by two oxygen jets located on the opposite sides of the geometric axis of the guni-ting torch, each making up a maximum angle of 50 with said axis, and passed through an ultrasonic whistle.
Such a direction of sonic vibrations makes it possible to embracethe guniting torch in said vibrations to a maximum extent.
It is most expedient that the sonic vibrations be delivered at a minimum field intensity level of 100 dB.
It is at such an intensity that the most complete burning up of fuel particles occurs.
The method for torch guniting of a metallurgical unit carried out in accordance with the present invention is instrumental in attaining a drastic increase in the durability of the gunned coating by using less costly and simplest means.
According to a further broad aspect of the present invention there is provided a method for torch guniting a metallurgical unit, wherein a guniting torch formed by a guniting mix, fuel and oxygen is direc-ted onto the refrac-tory lining of the unit and simultaneously exposed to the effect of acoustic vibrations. The acoustic vibrations are established by an oxygen jet directed along the geometric axis of the guniting torch and passed through an ultrasonic whistle.
Given below is a detailed description of a specific embodiment of the present invention with reference to the accompanying drawings, wherein:
FIG. 1 illustrates a tuyere and refractory lining of a metallurgical unit showing two versions of arrangement of ultrasonic whistles; and FIG. 2 is a scaled-up view of a unit A in Fig. 1.
.
- :: : :
;., ~ ,, ~ ~ . :
;: ,.
, ,.
: ~ . : . . ,, ~, .... . .
., ~z~
The method for -torch guniting of a metallur-gical unit consists in that a guniting torch 3 is directed from a tuyere 2 onto a refractory lining 1 (FIG. 1) of the metallurgical unit (omitted in the drawing), and said torch is simultaneously exposed to the effect of an energy field established by vir-tue of sonic vibrations 'a' which are maximally con-centrated at the guniting torch 3. The tuyere 2 comprlses coaxially arranged a piping 4 for feeding the guniting mix and fuel, a piping 5 for oxygen supply and a piping 6 for coolant supply. The piping 4 has a nozzle 7 for the guniting mix and fuel, while the piping 5 is provided with a nozzle 8 for oxygen to admit~ According to a first embodiment, the nozzle 8 is made up of an ultrasonic whistle 9 (FIG. 2) and a flare 10. In said embodiment sonic vibrations are established by an oxygen jet dis-charging along a geometric axis 'b' (FIG. 1) of the guniting torch through the ultrasonic whistle 9 ~FIG. 2).
According to another embodiment, sonic vibra-tions are created by two oxygen jets passing t.hrough ultrasonic whistles 11 (FIG. 1) which are arranged on the opposite sides of the geometric axis 'b' of the guniting torch 3 and at a maximum angle ~
of 50 thereto. The ultrasonic whistle 11 is sub-stantially similar to the whistle 9, the sole dif-ference being ln that its central portion is sol~d, :
- ,,; ~ ,, "::, , ' 6~
since the guniting mix and ~uel are passed th~ough the nozzle 7, while a major part of oxygen, through the nozle 12.
The proposed method of torch guni-ting was tested on converters of an iron-and-steel works.
For guniting use was made of routine two-component guniting mix, comprising a refractory and a fuel component. The guniting process was carried out with the converter in a vertical position. Once steel and slag had been discharged the tuyere 2 was brought into the converter and the guniting mix started to be fed through the nozzle, while oxygen, through the nozzle 12. Additional oxygen jets were fed through the ultrasonic whistles 11 arranged on both sides of -the nozzles 7 and 12.
The oxygen jets, while passing through the whistle 11, oscillate the sonic vibrations directed at an angle of 30 to the axis 'b' of the guniting torch 3.
The process of fuel combustion is accompanied by evolution of some volatiles which, while burn-ing up, wrap around the fuel particles, thus im-peding access of oxygen thereto. As a result, in-tensive burning of the fuel particles occurs after said volatiles have burned up. When the guniting torch 3 is exposed to the effect of concentrated sonic vibrations, the energy of the resultant acoustic field is high enough for the gaseous medium volatiles and ,.:
`' ;~' ' : ' the solids to oscillate, thus facilitating oxygen ingress to the fuel particles and intensifying the combustion process in the guniting torch. The fuel particles burn up while in flight, which reduces drastically the void content of the lining ob-tained.
On the other hand, the volatiles pass over the re~ractory particles, which improves the heat exchange process in the guniting torch and, along with the lower void content, upgrades the gunned lining obtained. Use of addi-tional oxygen jets for establishing sonic vibrations makes it possible to attain an adequate power of said vibrations without any further sources of energy and without loss of oxygen, since oxygen fed in the additional jets is also engaged in the fuel burning process.
There have been carried out comparative tests of the known methods with the herein-proposed method for torch guniting of metallurgical units, the results of said tests being tabulated below.
Table ___________________________________ __________________ tem No. Guniting Intensity Rate of Remarks method level, wear of dB lining, mg/cm2 s ________________________________ _____________________ _______________ ___________ _________________ ~____ __ 1 According to USSR High Inventor's Certi- void con-field) - 30.2 applied . .
'' ,. .
., :
.
~2~ 2 Table continued ______________________________________________________
The invention is most expedient to be applied for repair or reconditioning of the lining of con--verters, steel-making arc furnaces, open-hearth fur-naces, ladles and other steeI-making units when under a hot condition.
Known in the present state of the art is a method for guniting the refractory lining of metal-lurgical units, wherein the gunite mix is fed, via a nozzle, into a torch, whereupon a d.c. electric field is established between the nozzle and the refractory lining to be repaired (cf., e.g., USSR
Inventor's Certificate No. 334,464 published on March 30, 1982 in Bulletin No. 12 "Discoveries, in-ventions, industrial designs and trade marks").
When repairing by said method the particles in the guniting torch are charged with like charges so that electrostatic repulsive forces are partially acting bet~een the like charges during formation of a gunited coating, which results in a lower density of the gunited coating with respect to the base re-fractory lining and hence in a lower durability of said coating.
:
,r . - , ,: ... , .. .~, , ~., ~ , -.~ . . .. . . .
-, ~6D~6~2~
There is also known a method for torch gunit-ing of the lining of a metallurgical unit, wherein a guniting torch formed by a guniting mix, fuel and oxygen, is directed onto the refractory lining of the unit, while the guniting torch is exposed to the effect of a wave energy field having a frequency of from 1.0 to 20 kHz.
The wave energy field propagates over the entire interior space of -the unit and acts upon the guniting torch located therein (cf., e.g., USSR Inventor's Certificate No. 768,819 published on October 7, 1980 in Bulletin No. 37 "Discoveries, inventions, indus-trial designs and trade marks").
In the aforesaid method of guniting the wave energy of the field is spread over the entire in~
terior space of the unit so that but a relatively small proportion of it acts upon the guniting torch, Hence inadequate intensification of the burning and heat-e~change processes occurs in the guniting torch due to too low intensity of the field effective there-in, with the result that fuel particles have not time enough to burn completely in the course of flight, get embedded in the gunned coating being applied and burn down on the surface of the coating and inside it. This in turn increases the porocity (void con-tent) of the gunned coating and hence affects adversely ~ :. - : :
,: : , : .
, , - .~ ~ ., its durability. On the o-ther hand, any increase in the power of a source of the energy field -to such an extent that would provide an adequate intensifi-cation of the aforesaid processes is not practicable due to a harmful effect of the field upon the me-tal-lurgical unit involved and -the attending personnel.
It is a primary and essential objec-t of the present invention to provide a gunned coating possessing higher durability.
Said object is accomplished due to the fact that in a method for torch guniting of a metallur-gical unit, wherein a guniting torch formed by a guniting mix, fuel and oxygen, is directed onto the refractory lining of the unit involved, while the guniting torch is simultaneously exposed to the effect of a wave energy field, according to the invention, said wave energy field is established by virtue of sonic vibrations maximally concentrated at the guniting torch.
It is expedient that sonic vibrations be de-veloped by virtue of an oxygen jet directed along a geometric axis of the torch and passed through an ultrasonic whistle.
Such a way of developing sonic vibrations enables the simplest technical solution of the proposed method to be applied at minimum costs.
_ 4 _ : : "''"
;.; ,, , : ,:,,, .. . ..
" ~
, . .
~2~;~6~
It is not less expedient that said sonic vibrations be established by two oxygen jets located on the opposite sides of the geometric axis of the guni-ting torch, each making up a maximum angle of 50 with said axis, and passed through an ultrasonic whistle.
Such a direction of sonic vibrations makes it possible to embracethe guniting torch in said vibrations to a maximum extent.
It is most expedient that the sonic vibrations be delivered at a minimum field intensity level of 100 dB.
It is at such an intensity that the most complete burning up of fuel particles occurs.
The method for torch guniting of a metallurgical unit carried out in accordance with the present invention is instrumental in attaining a drastic increase in the durability of the gunned coating by using less costly and simplest means.
According to a further broad aspect of the present invention there is provided a method for torch guniting a metallurgical unit, wherein a guniting torch formed by a guniting mix, fuel and oxygen is direc-ted onto the refrac-tory lining of the unit and simultaneously exposed to the effect of acoustic vibrations. The acoustic vibrations are established by an oxygen jet directed along the geometric axis of the guniting torch and passed through an ultrasonic whistle.
Given below is a detailed description of a specific embodiment of the present invention with reference to the accompanying drawings, wherein:
FIG. 1 illustrates a tuyere and refractory lining of a metallurgical unit showing two versions of arrangement of ultrasonic whistles; and FIG. 2 is a scaled-up view of a unit A in Fig. 1.
.
- :: : :
;., ~ ,, ~ ~ . :
;: ,.
, ,.
: ~ . : . . ,, ~, .... . .
., ~z~
The method for -torch guniting of a metallur-gical unit consists in that a guniting torch 3 is directed from a tuyere 2 onto a refractory lining 1 (FIG. 1) of the metallurgical unit (omitted in the drawing), and said torch is simultaneously exposed to the effect of an energy field established by vir-tue of sonic vibrations 'a' which are maximally con-centrated at the guniting torch 3. The tuyere 2 comprlses coaxially arranged a piping 4 for feeding the guniting mix and fuel, a piping 5 for oxygen supply and a piping 6 for coolant supply. The piping 4 has a nozzle 7 for the guniting mix and fuel, while the piping 5 is provided with a nozzle 8 for oxygen to admit~ According to a first embodiment, the nozzle 8 is made up of an ultrasonic whistle 9 (FIG. 2) and a flare 10. In said embodiment sonic vibrations are established by an oxygen jet dis-charging along a geometric axis 'b' (FIG. 1) of the guniting torch through the ultrasonic whistle 9 ~FIG. 2).
According to another embodiment, sonic vibra-tions are created by two oxygen jets passing t.hrough ultrasonic whistles 11 (FIG. 1) which are arranged on the opposite sides of the geometric axis 'b' of the guniting torch 3 and at a maximum angle ~
of 50 thereto. The ultrasonic whistle 11 is sub-stantially similar to the whistle 9, the sole dif-ference being ln that its central portion is sol~d, :
- ,,; ~ ,, "::, , ' 6~
since the guniting mix and ~uel are passed th~ough the nozzle 7, while a major part of oxygen, through the nozle 12.
The proposed method of torch guni-ting was tested on converters of an iron-and-steel works.
For guniting use was made of routine two-component guniting mix, comprising a refractory and a fuel component. The guniting process was carried out with the converter in a vertical position. Once steel and slag had been discharged the tuyere 2 was brought into the converter and the guniting mix started to be fed through the nozzle, while oxygen, through the nozzle 12. Additional oxygen jets were fed through the ultrasonic whistles 11 arranged on both sides of -the nozzles 7 and 12.
The oxygen jets, while passing through the whistle 11, oscillate the sonic vibrations directed at an angle of 30 to the axis 'b' of the guniting torch 3.
The process of fuel combustion is accompanied by evolution of some volatiles which, while burn-ing up, wrap around the fuel particles, thus im-peding access of oxygen thereto. As a result, in-tensive burning of the fuel particles occurs after said volatiles have burned up. When the guniting torch 3 is exposed to the effect of concentrated sonic vibrations, the energy of the resultant acoustic field is high enough for the gaseous medium volatiles and ,.:
`' ;~' ' : ' the solids to oscillate, thus facilitating oxygen ingress to the fuel particles and intensifying the combustion process in the guniting torch. The fuel particles burn up while in flight, which reduces drastically the void content of the lining ob-tained.
On the other hand, the volatiles pass over the re~ractory particles, which improves the heat exchange process in the guniting torch and, along with the lower void content, upgrades the gunned lining obtained. Use of addi-tional oxygen jets for establishing sonic vibrations makes it possible to attain an adequate power of said vibrations without any further sources of energy and without loss of oxygen, since oxygen fed in the additional jets is also engaged in the fuel burning process.
There have been carried out comparative tests of the known methods with the herein-proposed method for torch guniting of metallurgical units, the results of said tests being tabulated below.
Table ___________________________________ __________________ tem No. Guniting Intensity Rate of Remarks method level, wear of dB lining, mg/cm2 s ________________________________ _____________________ _______________ ___________ _________________ ~____ __ 1 According to USSR High Inventor's Certi- void con-field) - 30.2 applied . .
'' ,. .
., :
.
~2~ 2 Table continued ______________________________________________________
2 According to USSR Field energy Inventor's Certi- spread over ficate No. 768,819 the entire unit, (wave energy field) -20.4 the field utili-zation effi-ciency being as low as 2 percent
3 According to the 100 15.1 High-quality method of the in- 110 10.2 gunned lining vention (sonic vi- 120 9.6 is applied brations maximally 130 8.9 concentrated at the 140 6.3 guniting torch) 150 6.2 1656.4 As can be seen from the data tabulated above exposure of the guniting torch to the effect of concentrated sonic vibrations featuring a minimum field intensity of 100 dB provides for application of a high-quality lining. The rate of wear of the lining deposited by the proposed method is more than twice as low as the rate of wear of the linings appiied accordin~ to the heretofore-known methods.
It is also evident from the aforementioned table that application of gunite linings is most efficient under the effect of sonic vibrations having an in-tensity level ranging within 140 and 165 dB.
It is also evident from the aforementioned table that application of gunite linings is most efficient under the effect of sonic vibrations having an in-tensity level ranging within 140 and 165 dB.
Claims (2)
1. A method for torch guniting of a metallurgical unit, wherein a guniting torch formed by a guniting mix, fuel and oxygen is directed onto the refractory lining of the unit and simultaneously exposed to the effect of acoustic vibrations, said acoustic vibrations being established by an oxygen jet directed along the geometric axis of the guniting torch and passed through an ultrasonic whistle.
2. A method as claimed in claim 1, wherein said acoustic vibrations are produced by two oxygen jets provided at the opposite sides of the geometric axis of the guniting torch, each of the jets being directed at an angle of not more than 50° to said axis, by passing them through ultra-sonic whistles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000528381A CA1264612A (en) | 1987-01-28 | 1987-01-28 | Method for torch guniting of a metallurgical unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000528381A CA1264612A (en) | 1987-01-28 | 1987-01-28 | Method for torch guniting of a metallurgical unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1264612A true CA1264612A (en) | 1990-01-23 |
Family
ID=4134844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000528381A Expired - Fee Related CA1264612A (en) | 1987-01-28 | 1987-01-28 | Method for torch guniting of a metallurgical unit |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1264612A (en) |
-
1987
- 1987-01-28 CA CA000528381A patent/CA1264612A/en not_active Expired - Fee Related
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