WO2006068632A1

WO2006068632A1 - Method for restoring the refractory masonry of industrial furnaces by ceramic facing, device for carrying out said method and method for producing a ceramic facing mixture

Info

Publication number: WO2006068632A1
Application number: PCT/UA2005/000053
Authority: WO
Inventors: Viktor Anatol'evich Bondik; Oleg Ivanovich Datsko; Anatoliy Nikolayevich Mankevich; Anatoliy Yakovlevich Chepelyanskiy
Original assignee: Obschestvo S Ogranichennoy Otvetstvennost'yu 'nauchno-Vnedrencheskoe Predpriyatiye 'mak'
Priority date: 2004-12-24
Filing date: 2005-11-28
Publication date: 2006-06-29
Also published as: UA76057C2; PL383108A1; BG66019B1; PL208269B1; RU2007127027A; BG109906A

Abstract

A method and an apparatus for restoration of industrial furnace refractory masonry with a ceramic facing, includes burning of fuel components of ceramic facing mixture in an oxygen stream to form a torch, melting refractory powders of the mixture by this torch with simultaneous fusing surface layer of masonry area to be restored and facing its damaged places by the melt of refractory powders, the ceramic facing mixture being exposed to a weak pulse magnetic field. A method of preparation of a ceramic facing mixture including exposing the mixture to a weak pulsed magnetic field. The technical result is increasing the efficiency of the method of ceramic facing, by lowering the mixture's viscosity and by increasing its fluidity.

Description

A method for restoring refractory masonry of industrial furnaces with ceramic welding, an apparatus for implementing this method, and a method for manufacturing a mixture for ceramic welding.

The field of technology.

The invention relates to the restoration of damaged refractory masonry of industrial furnaces with ceramic welding and can be used in coke, metallurgical, glass and other industries.

The prior art.

To restore the damaged refractory masonry of industrial furnaces, the known method of ceramic surfacing is used, which consists in burning the fuel components of the mixture for ceramic surfacing (shotcrete mixture) in an oxygen stream with the formation of a torch, melting the refractory powders of the mixture using this torch while melting the surface layer of the restored section masonry and melting its damage with a melt of refractory powders. Installation for implementing this method contains a shotcrete mixture feeder equipped with an injector, compressed sources oxygen and inert gas, gunite lance (spear), connecting pipelines with control valves and a safety system that has the function of disconnecting the oxygen source and purging with inert gas the pipeline for transporting the gunite mixture (see UK Pat. 1P2180047, class F27D1 / 16, 1987).

The disadvantages of this method include significant losses of the mixture during surfacing, due to insufficient adhesion of the melt of refractory powders to the masonry material, increased porosity of the deposited layer and, as a result, its reduced strength. Installation for implementing this method is characterized by the complexity of the design.

A known method of restoring the refractory masonry of metallurgical aggregates of a cylindrical shape, characterized by supplying the refractory powder with a swirling jet in a fuel-oxygen gun spray gun using a cyclone-torch gun installation (see ed. St. USSR P381687, class C21C5 / 44, 1973). .

The disadvantages of this method include a narrowed scope, low quality of the deposited layer, increased loss of fuel, oxygen and refractory powder. Also known is a method of restoring a refractory masonry by feeding a refractory mixture (mass) to the gunite lance and transporting it in a torch to the masonry being restored, while a constant electric field is created between the gunite lance nozzle and the masonry being restored; in installation for the implementation of this method, the nozzle of the gunite tuyere and the furnace frame are connected to the opposite poles of a constant voltage source (see ed. St. USSR Nβ34464, class F27BZ / 14, 1972). This method was supposed to increase the resistance of the deposited layer, but the significant porosity of this layer does not allow to achieve the desired result, in addition, this method has a low efficiency.

A similar method is known for restoring the refractory masonry of metallurgical aggregates by ceramic welding, in which the shotcrete is affected by a wave energy field; in the installation for the implementation of this method, the shotcrete lance is equipped with directional wave emitters (see ed. St. USSR Y5768819, class F27D1 / 16, 1980).

The strength of the deposited layer in this method is slightly higher than with the above, but this method is characterized by low efficiency due to the dissipation of field energy throughout the unit. As a prototype, a method of restoring the refractory masonry of industrial furnaces with ceramic welding is adopted, which consists in burning the fuel components of the mixture for ceramic surfacing in an oxygen stream with the formation of a torch, melting the refractory powders of the mixture using this torch with simultaneous melting of the surface layer of the restored section of the masonry and melting of its damage with the melt refractory powders, while the torch is affected by a wave energy field formed by concentrated acoustic fluctuations; The installation for implementing this method comprises a mixture feed for ceramic surfacing, a compressed oxygen source, a system of connecting pipelines and a shotcrete lance with nozzles for the output of the shotcrete mixture and oxygen, and acoustic oscillators with energy directed toward the shotcrete are located near these nozzles (see ed. St. USSR P1208887, class F27D1 / 16, 1984).

In this method, the combustion of the fuel components of the mixture is somewhat intensified, which serves to somewhat reduce the porosity of the deposited layer and increase its strength, but this method is accompanied by strong noise generation, in addition, with this method, as with the aforementioned, physical properties and reduced technological properties remain without a qualitative change. the characteristics of the shotcrete mixture, and the implementation of ceramic surfacing is accompanied by significant losses of the mixture and oxygen. Thus, the known method is characterized by reduced efficiency.

Disclosure of the invention.

The original inventive idea was to improve the method for restoring the refractory masonry of industrial furnaces by ceramic welding by eliminating the disadvantages of the prototype, which provides an increase in the efficiency of the method. The problem is solved in such a way that in the method, which consists in burning the fuel components of the mixture for ceramic surfacing in an oxygen stream with the formation of a torch, melting the refractory powders of the mixture with using this torch with simultaneous melting of the surface layer of the restored masonry area and melting of its damage with a melt of refractory powders, the following technological transformation (difference) is provided: the mixture for ceramic surfacing is exposed to a pulsed weak magnetic field (ISMP).

The proposed technical solution is based on the phenomenon of qualitative changes under the influence of ISMP physical properties of materials that can respond to such an effect.

To implement this method, in a installation containing a mixture feeder for ceramic surfacing, gunite is a tuyere, one of the inputs of which is connected to a source of compressed oxygen, and the second to the output of the feeder, and a piping system with control valves and instrumentation, such constructive conversion

(difference): an ISMP generator is installed in the movement line of the mixture for ceramic surfacing. An additional difference is that the location of the indicated generator can be a feeder loading device for ceramic surfacing mixture or a feeder outlet, or a pipeline connecting the feeder with a gunite tuyere, or the mixture inlet to the gunite tuyere, or the mixture outlet from it.

A method of preparing a mixture for ceramic surfacing, which consists in grinding its components, sieving, dosing and mixing them and packing mixture, includes an additional operation - on the mixture and (after) the packaging operation is affected by ISPM.

The above differences, together with the prototype and the proposed method for the restoration of refractory masonry of industrial furnaces with ceramic surfacing, installation for implementing this method and method for preparing a mixture for ceramic surfacing, provide technical efficiency - increasing the efficiency of ceramic surfacing by influencing the mixture ISMP.

The above indicates the presence of a causal relationship between the totality of the essential features of the proposed technical solution and the ensured effectiveness. In the prior art, a method for restoring the refractory masonry of industrial furnaces with ceramic surfacing, an installation for implementing this method, and a method for preparing a mixture for ceramic surfacing, which would have coincided with the set of essential features that serves as the basis for the conclusion that their patentability criterion is "novelty," have not been identified "

The essence of the proposed technical solution is illustrated by the drawings, where Fig. 1 schematically shows an installation for the restoration of refractory masonry of industrial furnaces with ceramic welding with the placement of the ISMP generator in the feeder of the feeder mixture; figure 2 is a fragment of this installation with the location of the specified generator at the output of the feeder; in Fig.3 is a fragment of the installation with the placement of the generator on the pipeline that connects the feeder to the shotcrete lance; figure 4 is a fragment of the installation with the placement of the generator at the inlet of the mixture in the gunite tuyere; figure 5 is a fragment of the installation with the placement of the generator at the outlet of the mixture from the gunite tuyere.

Installation for the restoration of refractory masonry of industrial furnaces with ceramic welding contains a feeder 1 gunite mixture, gunite tuyere 2, source 3 of compressed oxygen. When using a chamber pump as a feeder 1, it is connected to a source of compressed air 4 (compressor or pneumatic line) using a pipeline 5. The feeder 1 is equipped with a gunning device 6 for loading it with a shotcrete mixture; the generator 7 ISMP is installed in this device. The output 8 of the feeder 1 is connected to the input 9 of the shotcrete lance 2 using the pipeline 10. Source 3 of compressed oxygen

(cylinder or oxygen line) is connected to the input 11 of the shotcrete lance 2 using the pipe 12.

Shotcrete lance 2 has an output 13 of a shotcrete mixture enriched with oxygen. Source 4, feeder 1, source 3 and pipeline 12 are equipped with control and measuring devices - pressure gauges 14-17, the corresponding control valves are installed on pipelines 5, 12 - switches 18, 19. It is advisable to produce pipelines 5, 10, 12 in the form of flexible hoses.

As a generator 7 ISMP can be used, for example, a solenoid block OIMP-101 GM 579.10.000 design Nizhny Novgorod State University, Russia, having the technical characteristic: supply voltage - 220 V; frequency - 50 Hz dimensions of the working chamber of the solenoid: diameter - 60 mm; length - 200 mm.

The shotcrete mixture is affected by ISPM in this mode: pulse transmission frequency - 0.5 Hz; working capacity - 100 microfarads; - the amplitude of the pulse is 2.7. 10 ^"5 A / m; the duration of the action is 2 and 4 minutes; the steepness of the leading edge of the pulse is 180 μs.

The ISMP generator 7 can be placed at another place in the line of movement of the shotcrete mixture, namely: at the outlet of the feeder 1 (Fig. 2), on the pipe 10, by which the feeder 1 is connected to the shotcrete lance 2 (Fig. 3), in the shotcrete lance 2 at the input (Fig. 4), at the output (Fig. 5).

When implementing the proposed method, a well-known mixture for ceramic surfacing is used, which includes fuel components

(powders of aluminum, silicon, titanium, etc.) and refractory powders (quartz sand, ground chamotte, dinas, etc.).

The restoration of the refractory masonry of industrial furnaces with ceramic welding using the proposed installation is as follows. In the initial position, the feeder 1 is disconnected from the compressed air source 4 by the switch 18, the shotcrete truck 2 is disconnected from the compressed oxygen source 3 by the switch 19. First, through the device b, the feeder 1 is loaded with the shotcrete mixture, after which it is sealed. Using the switch 19 from the source 3, compressed oxygen is supplied to the shotcrete lance 2 through the pipe 12 to the shotcrete lance 2, and the compressed air is supplied through the switch 18 from the source 4 through the pipe 5 to the feeder 1, under the action of which the mixture from the feeder 1 moves through the pipe 10 to the shotcrete lance 2. In the shotcrete lance, the mixture is enriched with oxygen and flows from exit 13. With this movement, the shotcrete mixture is affected by ISPM. The flow of the shotcrete mixture is directed to the damaged area of the masonry, from the thermal effect of which the fuel components of the mixture flash with the formation of a torch. Flowing through this torch, the refractory powders of the mixture are melted, while the area of the masonry with which this torch is in contact is softened. Melt of refractory powders of the mixture melts cracks, chips, shells, etc. masonry damage.

A mixture for ceramic surfacing is prepared in the following sequence: grinding its components, sieving them by size, dosing these components, mixing them, packing and packing the mixture; before packing of the shotcrete mixture or after it, the mixture is exposed to ISPM.

Technological equipment of any design is suitable for equipping a mixture preparation area: crusher, screen, dispenser, mixer, filling and packaging machine and the aforementioned ISMP generator.

Thanks to the influence of ISMP, the mixture for ceramic surfacing acquires such qualitatively better properties: 1) increased fluidity;

2) accelerated melting of the refractory powders of the mixture and softening of the corresponding section of the masonry due to a more complete combustion of the fuel components of the mixture; 3) reduced to 30% loss of the mixture during ceramic welding due to increased adhesion of its melt to the masonry material;

4) reduced porosity of the deposited layer and its increased strength. As a result of the influence of ISMP on the mixture for ceramic surfacing, its viscosity level, measured using a direct torsional low-frequency pendulum damped by the mixture, decreased by more than 40% from the initial level (before the action of ISMP). Accordingly, its fluidity increased.

After exposure to the mixture, ISMP up to 16% decreased porosity of the deposited layer, determined by the method of JIS R 2205 (1958) (see the reference book, “Fire”, M., Publishing House, “Metallurgy”, 1967, p.19-21. ) _/ and its compressive strength, determined by the method of JIS R 2206 (1958) (ibid., pp.21-23), increased by 14%.

Qualitatively new physical properties acquired by bulk material due to the effect on ISMP, are stored not only for a long time, but also after a change in its state of aggregation, namely: after the transition of bulk material from solid to liquid during surfacing, and then to solid as a result of solidification of the melt with the formation of a deposited layer, which indicates the presence in the material of the effect of memory about the effect of ISMP on it

Thus, there is an increase in the effectiveness of the presented method.

Industrial applicability.

The proposed technical solution meets the patentability criterion, “intended applicability", as evidenced by the following: 1) it is designed to restore the refractory masonry of industrial furnaces with ceramic welding and can be used in coke, metallurgical, glass and other industries; 2) installation for the implementation of the claimed method, the plot of the preparation of the mixture for ceramic surfacing in the form as described in the claims, can be made with the use of well-known structural materials and semi-finished products, technology, equipment and technical means;

3) the proposed technical solution, as described in the claims, is able to provide the above technical effectiveness. The proposed method and installation for its implementation of the described design and method for preparing a mixture for ceramic welding in 2004 Successful pilot tests took place at Avdeevka Coke and Chemical Plant OJSC and Donetskoks OJSC

SUBSTITUTE SHEET (RULE 26)

Claims

CLAIM

1. The method of restoring the refractory masonry of industrial furnaces by ceramic welding, which consists in burning the fuel components of the mixture for ceramic surfacing in an oxygen stream with the formation of a torch, melting the refractory powders of the mixture using this torch with simultaneous melting of the surface layer of the restored section of the masonry and melting its damage with a melt of refractory powders , which is characterized in that the mixture for ceramic surfacing is affected by a pulsed weak magnetic field.

2. Installation for implementing the method according to claim 1, comprising a mixture feeder for ceramic surfacing, a shotcrete tuyere, one of the inputs of which is connected to a source of compressed oxygen, and the second to the output of the feeder, and a piping system with adjusting fittings and instrumentation , which is characterized in that a pulsed weak magnetic field generator is installed in the movement line of the mixture for ceramic surfacing.

3. The installation according to claim 2, characterized in that the pulsed weak magnetic field generator is installed in the feeder loading device with a mixture for ceramic welding.

4. Installation according to claim 2, characterized in that the generator of a pulsed weak magnetic field installed at the outlet of the mixture for ceramic surfacing from the feeder.

5. Installation according to claim 2, characterized in that the generator of a pulsed weak magnetic field is installed on the pipeline, by which the output of the feeder is connected to the input of the shotcrete lance.

6. The installation according to claim 2, characterized in that the generator of a pulsed weak magnetic field is installed at the inlet of the mixture for ceramic surfacing in a shotcrete lance.

7. The installation according to claim 2, characterized in that the generator of a pulsed weak magnetic field is installed at the outlet of the mixture for ceramic surfacing from gunite tuyere.

8. A method of preparing a mixture for ceramic surfacing, which consists in grinding its components, sieving, dosing and mixing them and packing the mixture, which differs in that the mixture is exposed to a pulsed weak magnetic field before (after) the packing operation.

SUBSTITUTE SHEET (RULE 26)