WO2024033852A1 - Burner for industrial kilns - Google Patents

Burner for industrial kilns Download PDF

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Publication number
WO2024033852A1
WO2024033852A1 PCT/IB2023/058081 IB2023058081W WO2024033852A1 WO 2024033852 A1 WO2024033852 A1 WO 2024033852A1 IB 2023058081 W IB2023058081 W IB 2023058081W WO 2024033852 A1 WO2024033852 A1 WO 2024033852A1
Authority
WO
WIPO (PCT)
Prior art keywords
tubular portion
fact
burner
tubular
duct
Prior art date
Application number
PCT/IB2023/058081
Other languages
French (fr)
Inventor
Fabio TAROZZI
Original Assignee
Siti - B&T Group S.P.A.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siti - B&T Group S.P.A. filed Critical Siti - B&T Group S.P.A.
Publication of WO2024033852A1 publication Critical patent/WO2024033852A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
    • F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/70—Baffles or like flow-disturbing devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2207/00—Ignition devices associated with burner
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/11402—Airflow diaphragms at burner nozzle

Definitions

  • the present invention relates to a burner for industrial kilns.
  • burners In the field of industrial kilns for firing ceramic artifacts, burners are used that generate heat energy and deliver it to a part of the kiln, known as the combustion chamber, within which the artifacts being fired are located or pass through.
  • the burners of known type comprise a first tubular body, defining a first duct for the flow of a comburent fluid (usually air), and a second tubular body, developing within the first duct and defining a second duct for the flow of a combustible fluid.
  • a comburent fluid usually air
  • a second tubular body developing within the first duct and defining a second duct for the flow of a combustible fluid.
  • the burners comprise a combustion head that is associated with the first duct and with the second duct in a fluid- operated manner and where the mixing between the combustible fluid and the comburent fluid as well as the combustion of that mixture occurs.
  • the combustion head is provided with diffusion means, communicating with the first duct, and with dispensing means, communicating with the second duct, and adapted to convey the comburent fluid and the combustible fluid towards the aforementioned combustion area, respectively.
  • Ignition means generally comprise a sensing electrode and an ignition electrode which are arranged along the first duct, pass through the combustion head and end up in the combustion area.
  • the ignition electrode is triggered as soon as the sensing electrode senses the presence of the combustion/comburent fluid mixture exiting the combustion head, leading to the combustion of the mixture itself and to the production of a flame exiting the combustion head.
  • the burners of known type do however have some drawbacks that are mainly related to the difficulty of keeping heat distribution constant inside the kiln wherein they are mounted.
  • the length of the flame exiting the combustion head can vary depending on the chemical composition of the combustible fluid.
  • the main aim of the present invention is to devise a burner for industrial kilns which allows keeping heat distribution constant within the kiln wherein it is installed.
  • the object of the present invention is to devise a burner for industrial kilns which allows the distance of the flame from the kiln walls to be adjusted, making it as constant as possible over time.
  • Another object of the present invention is to devise a burner for industrial kilns which allows obtaining finished products having a uniform degree of firing which conforms to the expected production standards.
  • Another object of the present invention is to devise a burner for industrial kilns which can overcome the aforementioned drawbacks of the prior art within the framework of a simple, rational, easy and effective to use as well as inexpensive solution.
  • Figure 1 is an axonometric view of the burner according to the invention in a particular configuration of use
  • Figure 2 is an axonometric view of the burner according to the invention in a different configuration of use from that shown in Figure 1 ;
  • Figure 3 is an axonometric, partly cutaway view of the burner according to the invention.
  • Figure 4 is a longitudinal cross-sectional view of the burner in Figure 1;
  • Figure 5 is a front view of the burner according to the invention.
  • reference numeral 1 globally denotes a burner for industrial kilns.
  • This burner 1 is intended to be applicable to an industrial kiln intended for drying/firing ceramic artifacts such as, e.g., tiles, sanitary ware or the like.
  • the burner 1 comprises at least one tubular body 2 extending longitudinally along an axis of development S and defining at least one first duct 3 for the flow of a comburent fluid towards a combustion area A.
  • the tubular body 2 or at least one portion thereof is attached to the wall bounding the combustion chamber of the kiln itself.
  • the tubular body 2 comprises at least one inlet mouth 4 and at least one outlet mouth 5 of the comburent fluid which are connected to the first duct 3 in a fluid- operated manner.
  • the inlet mouth 4 is obtained on the outer side surface of the tubular body 2 and placed where one of the longitudinal ends of the tubular body 2 is located.
  • outlet mouth 5 is obtained on the other longitudinal end of the tubular body 2 and is along the axis of development S.
  • the comburent fluid is generally made up of air, possibly preheated to a certain temperature.
  • the comburent fluid comprises oxygen-enriched air.
  • the burner 1 comprises at least one tubular element 6 associated with the tubular body 2, arranged within the first duct 3 and defining at least one second duct 7 for the flow of a combustible fluid.
  • the volume between the tubular body 2 and the tubular element 6 defines the first duct 3.
  • the second duct 7 is defined within the tubular element 6.
  • the tubular element 6 develops longitudinally along an axis which is substantially coincident with the axis of development S.
  • the tubular element 6 comprises at least one inlet opening 8 and at least one outlet opening 9 of the combustible fluid, each of which, in the particular embodiment shown in the figures, is obtained at a respective longitudinal end of the tubular element 6.
  • the inlet opening 8 and the outlet opening 9 are arranged centrally with respect to the axis of longitudinal development of the tubular element 6.
  • the combustible fluid is made up of hydrogen possibly mixed with another gas, e.g., methane.
  • the burner 1 comprises at least one combustion head 10 associated with the ducts 3, 7 in a fluid-operated manner and adapted to diffuse the fluids towards the combustion area A.
  • the combustion head 10 is positioned where the outlet mouth 5 and the outlet opening 9 are located and is connected with them in a fluid- operated manner.
  • the combustion head 10 comprises: dispensing means 11 of the combustible fluid, communicating with the second duct 7 and provided with a plurality of holes 12 for the flow of the combustible fluid towards the combustion area A; diffusion means 13 of the comburent fluid, communicating with the first duct 3 and provided with a plurality of apertures 14 for the flow of the comburent fluid towards the combustion area A.
  • the dispensing means 11 and the diffusion means 13 allow mixing the combustible fluid with the comburent fluid within the combustion area A, which is useful to promote the subsequent combustion thereof.
  • the burner 1 then comprises ignition means 15, 16 associated with the tubular body 2 and adapted to activate the combustion of the mixture of the fluids at the combustion area A.
  • Such ignition means 15, 16 are of a type substantially known to the field technician and preferably comprise a sensing electrode 15 and an ignition electrode 16.
  • the sensing electrode 15 and the ignition electrode 16 are arranged along the first duct 3, pass through the combustion head 10 and face the combustion area A.
  • the sensing electrode 15 and the ignition electrode 16 pass precisely through the outlet mouth 5.
  • the ignition electrode 16 When the sensing electrode 15 senses the presence of the mixture in the combustion area A, the ignition electrode 16 is activated which leads to the combustion of the mixture, generating a flame that heats the inside of the combustion chamber.
  • the tubular body 2 comprises at least one first tubular portion 17 and at least one second tubular portion 18, wherein the first tubular portion 17 is associated with the second tubular portion 18 in a sliding manner along the axis of development S.
  • the combustion head 10, the ignition means 15, 16 and the tubular element 6 are associated with the first tubular portion 17 and can be moved locked together therewith during the relevant sliding along the axis of development S.
  • the second tubular portion 18 is attached to the walls bounding the combustion chamber.
  • the first tubular portion 17, together with the combustion head 10, with the ignition means 15, 16 and with the tubular element 6 can be moved with respect to the walls of the combustion chamber.
  • the ignition means 15, 16 and the tubular element 6 can be moved close to/ away from the kiln walls in order to keep the distance of the flame front from the same walls almost constant.
  • the first tubular portion 17 is insertable/extractable, at least partly, into/from the second tubular portion 18 as a result of the relevant sliding along the axis of development S.
  • the first tubular portion 17 has a first axial end 19 fitted within the second tubular portion 18 and a second axial end 20, opposite the first axial end 19, arranged externally to the second tubular portion 18 and associated with the combustion head 10.
  • the second axial end 20 comprises the outlet mouth 5.
  • the first axial end 19 moves close to or away from the inlet mouth 4 depending on whether the first tubular portion 17 is moved in the direction of insertion or extraction with respect to the second tubular portion 18 respectively.
  • the position of the tubular element 6, of the combustion head 10 and of the ignition means 15, 16 with respect to the kiln walls can be thus changed by varying the position of the first tubular portion 17.
  • the burner 1 comprises fastening means 21 adapted to firmly associate the tubular element 6 with the first tubular portion 17.
  • the fastening means 21 are arranged at the first axial end 19 of the first tubular portion 17.
  • the first axial end 19 has a connecting flange 22 fitted on the tubular element 6 and the fastening means 21 are adapted to mechanically constrain the connecting flange 22 to the tubular element 6.
  • the ignition means 15, 16 and the combustion head 10 are firmly associated with the tubular element 6.
  • the burner 1 comprises connecting means 23 of the ignition means 15, 16 to the tubular element 6 and the combustion head 10 is locked together with the tubular element 6.
  • the connecting means 23 comprise a collar fitted on the tubular element 6 and supporting both the sensing electrode 15 and the ignition electrode 16.
  • the dispensing means 11 comprise a dispensing body 24 which is mounted on the tubular element 6 where the outlet opening 9 is located.
  • Outlet holes 12 of the combustible fluid exiting the second duct 7 are cut on the dispensing body 24.
  • the diffusion means 13 comprise a diffusion body 25 substantially crownshaped and associated with the outer side surface of the tubular element 6 in the proximity of the outlet opening 9.
  • the apertures 14 for the exit of the comburent fluid from the first duct 3 are cut on the diffusion body 25.
  • the burner 1 comprises abutment means 26 adapted to limit the sliding of the first tubular portion 17 in the direction of extraction from the second tubular portion 18.
  • the abutment means 26 comprise an abutment body mounted at the end of the second tubular portion 18 opposite the end into which the first axial end 19 of the first tubular portion 17 is fitted in a sliding manner.
  • Such an abutment body protrudes within the second tubular portion 18.
  • the burner 1 comprises cooling means 27 adapted to distribute a cooling fluid along at least one stretch of the outer surface of the tubular body 2.
  • the cooling means 27 comprise at least one choking element 28 for choking the flow of the fluid communicating with the first duct 3 and adapted to cause the comburent fluid to partly exit the first duct 3 and to direct it onto the outer surface of the first tubular portion 17.
  • an inter- space 29 is defined between the first tubular portion 17 and the second tubular portion 18.
  • the inter-space 29 is bounded by the inner surface of the second tubular portion 18 and by the outer surface of the stretch of the first tubular portion 17 inserted within the second tubular portion 18.
  • the choking element 28 is set in communication with the inter-space 29.
  • the choking element 28 is arranged to surround the first tubular portion 17.
  • the choking element 28 has a substantially plate-shaped conformation and is provided with a connecting hole 30 which is arranged around the first tubular portion 17 so as to develop centrally to the axis of development S.
  • the choking element 28 is provided with at least one slit 31 for the outflow of the comburent fluid from the first duct 3 towards the outer surface of the first tubular portion 17.
  • the choking element 28 comprises a plurality of slits 31 arranged in a radial pattern around the connecting hole 30 and equidistant from each other.
  • the slits 31 thus defined communicate fluidically with the inter- space 29 and allow the comburent fluid to exit, partly, the first duct 3 so as to lap the outer surface of the first tubular portion 17.
  • the cooling means 27 comprise at least one outlet port 32 of the comburent fluid from the first duct 3 formed on the outer side surface of the first tubular portion 17.
  • the cooling means 27 comprise a plurality of outlet ports 32 which are obtained where the second axial end 20 is located.
  • the outlet ports 32 are positioned at the outlet mouth 5, arranged in a radial pattern thereto and equidistant from each other.
  • a further aspect of the present invention relates to the use of the burner 1 which comprises the following steps of: introducing a comburent fluid comprising at least air into the first duct 3; introducing a combustible fluid comprising at least hydrogen into the second duct 7; adjusting the position of the first tubular portion 17 with respect to the second tubular portion 18 depending on the percentage of hydrogen contained in the combustible fluid; mixing the comburent fluid and the combustible fluid in the combustion area A to obtain a mixture of the fluids; combustion of the mixture.
  • the comburent fluid is introduced into the first duct 3 through the inlet mouth 4, while the combustible fluid is introduced into the second duct 7 through the inlet opening 8.
  • the combustible fluid comprises a mixture of hydrogen and methane.
  • a flame of varying length is obtained at the outlet of the combustion head 10.
  • the flame length decreases proportionally as the percentage concentration of hydrogen increases with respect to the percentage concentration of methane.
  • the first tubular portion 17 is progressively moved in the direction of extraction by the second tubular portion 18 as the percentage of hydrogen in the combustible fluid increases and vice versa.
  • the comburent fluid flows into the combustion area A exiting the diffusion means 13 and, at the same time, the combustible fluid exits the dispensing means 11 being in the combustion area A where it mixes with the comburent fluid.
  • the sensing electrode 15 senses the presence of the mixture and then the ignition electrode 16 triggers the combustion of the mixture itself, which generates a flame exiting the combustion head 10.
  • the special expedient of making the tubular body of the burner in two separate, slidingly associated portions, and the fact of firmly associating the combustion head, the ignition means and the tubular element with the movable portion allows the distance of the flame to be adjusted from the kiln walls, making it as constant as possible over time. In this way, it is possible to obtain a uniform and constant distribution of heat inside the kiln over time, which allows for uniform firing of artifacts and in a manner that conforms to the standards required for production.

Abstract

The burner (1) for industrial kilns, comprises: - one tubular body (2) extending longitudinally along an axis of development (S) and defining one first duct (3) for the flow of a comburent fluid towards a combustion area (A); - one tubular element (6) associated with the tubular body (2), arranged within the first duct (3) and defining one second duct (7) for the flow of a combustible fluid; one combustion head (10); - ignition means (15, 16); wherein: - the tubular body (2) comprises one first tubular portion (17) and one second tubular portion (18), wherein the first tubular portion (17) is associated with the second tubular portion (18) in a sliding manner; - the combustion head (10), the ignition means (15, 16) and the tubular element (6) are associated with the first tubular portion (17) and are movable jointly therewith during the relevant sliding.

Description

BURNER FOR INDUSTRIAL KILNS
Technical Field
The present invention relates to a burner for industrial kilns.
Background Art
In the field of industrial kilns for firing ceramic artifacts, burners are used that generate heat energy and deliver it to a part of the kiln, known as the combustion chamber, within which the artifacts being fired are located or pass through.
Generally, the burners of known type comprise a first tubular body, defining a first duct for the flow of a comburent fluid (usually air), and a second tubular body, developing within the first duct and defining a second duct for the flow of a combustible fluid.
In addition, the burners comprise a combustion head that is associated with the first duct and with the second duct in a fluid- operated manner and where the mixing between the combustible fluid and the comburent fluid as well as the combustion of that mixture occurs.
More in detail, the combustion head is provided with diffusion means, communicating with the first duct, and with dispensing means, communicating with the second duct, and adapted to convey the comburent fluid and the combustible fluid towards the aforementioned combustion area, respectively.
At the combustion area, as a result of the mixing of the comburent fluid with the combustible fluid, the combustion of this mixture takes place due to the activation of ignition means provided by the burners themselves.
Ignition means generally comprise a sensing electrode and an ignition electrode which are arranged along the first duct, pass through the combustion head and end up in the combustion area.
The ignition electrode is triggered as soon as the sensing electrode senses the presence of the combustion/comburent fluid mixture exiting the combustion head, leading to the combustion of the mixture itself and to the production of a flame exiting the combustion head.
The burners of known type do however have some drawbacks that are mainly related to the difficulty of keeping heat distribution constant inside the kiln wherein they are mounted.
Particularly, what can vary greatly when using the above burners is the distance of the flame front from the kiln walls.
Mainly, the length of the flame exiting the combustion head can vary depending on the chemical composition of the combustible fluid.
Such irregularity in the distance of the flame front from the kiln walls results in a time-varying distribution of heat inside the kiln that leads, oftentimes, to subop timal firing of artifacts.
Description of the Invention
The main aim of the present invention is to devise a burner for industrial kilns which allows keeping heat distribution constant within the kiln wherein it is installed.
Within that aim, the object of the present invention is to devise a burner for industrial kilns which allows the distance of the flame from the kiln walls to be adjusted, making it as constant as possible over time.
Another object of the present invention is to devise a burner for industrial kilns which allows obtaining finished products having a uniform degree of firing which conforms to the expected production standards.
Another object of the present invention is to devise a burner for industrial kilns which can overcome the aforementioned drawbacks of the prior art within the framework of a simple, rational, easy and effective to use as well as inexpensive solution.
The above objects are achieved by this burner for industrial kilns having the characteristics of claim 1.
Additionally, the above objects are achieved by the use of the burner for industrial kilns having the characteristics of claim 15.
Brief Description of the Drawings
Other characteristics and advantages of the present invention will become more apparent from the description of a preferred, but not exclusive, embodiment of a burner for industrial kilns, illustrated by way of an indicative, yet non-limiting example in the accompanying tables of drawings wherein:
Figure 1 is an axonometric view of the burner according to the invention in a particular configuration of use;
Figure 2 is an axonometric view of the burner according to the invention in a different configuration of use from that shown in Figure 1 ;
Figure 3 is an axonometric, partly cutaway view of the burner according to the invention;
Figure 4 is a longitudinal cross-sectional view of the burner in Figure 1;
Figure 5 is a front view of the burner according to the invention.
Embodiments of the Invention
With particular reference to these figures, reference numeral 1 globally denotes a burner for industrial kilns.
This burner 1 is intended to be applicable to an industrial kiln intended for drying/firing ceramic artifacts such as, e.g., tiles, sanitary ware or the like.
Particularly, the installation of a plurality of burners 1 within a specific industrial kiln is provided.
The burner 1 comprises at least one tubular body 2 extending longitudinally along an axis of development S and defining at least one first duct 3 for the flow of a comburent fluid towards a combustion area A.
When the burner 1 is applied to an industrial kiln, the tubular body 2 or at least one portion thereof is attached to the wall bounding the combustion chamber of the kiln itself.
The tubular body 2 comprises at least one inlet mouth 4 and at least one outlet mouth 5 of the comburent fluid which are connected to the first duct 3 in a fluid- operated manner.
In the particular embodiment shown in the figures, the inlet mouth 4 is obtained on the outer side surface of the tubular body 2 and placed where one of the longitudinal ends of the tubular body 2 is located.
Again, the outlet mouth 5 is obtained on the other longitudinal end of the tubular body 2 and is along the axis of development S.
The comburent fluid is generally made up of air, possibly preheated to a certain temperature. Preferably, the comburent fluid comprises oxygen-enriched air.
The burner 1 comprises at least one tubular element 6 associated with the tubular body 2, arranged within the first duct 3 and defining at least one second duct 7 for the flow of a combustible fluid.
The volume between the tubular body 2 and the tubular element 6 defines the first duct 3.
The second duct 7 is defined within the tubular element 6.
The tubular element 6 develops longitudinally along an axis which is substantially coincident with the axis of development S.
The tubular element 6 comprises at least one inlet opening 8 and at least one outlet opening 9 of the combustible fluid, each of which, in the particular embodiment shown in the figures, is obtained at a respective longitudinal end of the tubular element 6.
More particularly, the inlet opening 8 and the outlet opening 9 are arranged centrally with respect to the axis of longitudinal development of the tubular element 6.
Preferably, the combustible fluid is made up of hydrogen possibly mixed with another gas, e.g., methane.
The burner 1 comprises at least one combustion head 10 associated with the ducts 3, 7 in a fluid-operated manner and adapted to diffuse the fluids towards the combustion area A.
Precisely, the combustion head 10 is positioned where the outlet mouth 5 and the outlet opening 9 are located and is connected with them in a fluid- operated manner.
Preferably, the combustion head 10 comprises: dispensing means 11 of the combustible fluid, communicating with the second duct 7 and provided with a plurality of holes 12 for the flow of the combustible fluid towards the combustion area A; diffusion means 13 of the comburent fluid, communicating with the first duct 3 and provided with a plurality of apertures 14 for the flow of the comburent fluid towards the combustion area A. The dispensing means 11 and the diffusion means 13 allow mixing the combustible fluid with the comburent fluid within the combustion area A, which is useful to promote the subsequent combustion thereof.
The burner 1 then comprises ignition means 15, 16 associated with the tubular body 2 and adapted to activate the combustion of the mixture of the fluids at the combustion area A.
Such ignition means 15, 16 are of a type substantially known to the field technician and preferably comprise a sensing electrode 15 and an ignition electrode 16.
As visible in the figures, the sensing electrode 15 and the ignition electrode 16 are arranged along the first duct 3, pass through the combustion head 10 and face the combustion area A.
The sensing electrode 15 and the ignition electrode 16 pass precisely through the outlet mouth 5.
When the sensing electrode 15 senses the presence of the mixture in the combustion area A, the ignition electrode 16 is activated which leads to the combustion of the mixture, generating a flame that heats the inside of the combustion chamber.
According to the invention, the tubular body 2 comprises at least one first tubular portion 17 and at least one second tubular portion 18, wherein the first tubular portion 17 is associated with the second tubular portion 18 in a sliding manner along the axis of development S.
Additionally, again according to the present invention, the combustion head 10, the ignition means 15, 16 and the tubular element 6 are associated with the first tubular portion 17 and can be moved locked together therewith during the relevant sliding along the axis of development S.
When the burner 1 is mounted in an industrial kiln, the second tubular portion 18 is attached to the walls bounding the combustion chamber.
It follows, therefore, that the first tubular portion 17, together with the combustion head 10, with the ignition means 15, 16 and with the tubular element 6 can be moved with respect to the walls of the combustion chamber. In this way, depending on the length of the flame exiting the combustion head 10, the combustion head 10, the ignition means 15, 16 and the tubular element 6 can be moved close to/ away from the kiln walls in order to keep the distance of the flame front from the same walls almost constant.
As can be seen from Figures 1 and 2, the first tubular portion 17 is insertable/extractable, at least partly, into/from the second tubular portion 18 as a result of the relevant sliding along the axis of development S.
Particularly, the first tubular portion 17 has a first axial end 19 fitted within the second tubular portion 18 and a second axial end 20, opposite the first axial end 19, arranged externally to the second tubular portion 18 and associated with the combustion head 10.
The second axial end 20 comprises the outlet mouth 5.
As a result of the movement along the axis of development S of the first tubular portion 17 with respect to the second tubular portion 18, the first axial end 19 moves close to or away from the inlet mouth 4 depending on whether the first tubular portion 17 is moved in the direction of insertion or extraction with respect to the second tubular portion 18 respectively.
Precisely, in Figure 1 the first tubular portion 17 is almost completely extracted from the second tubular portion 18, while in Figure 2 the first tubular portion 17 is almost completely fitted within the second tubular portion 18.
In use, therefore, the position of the tubular element 6, of the combustion head 10 and of the ignition means 15, 16 with respect to the kiln walls can be thus changed by varying the position of the first tubular portion 17.
Advantageously, the burner 1 comprises fastening means 21 adapted to firmly associate the tubular element 6 with the first tubular portion 17.
Preferably, the fastening means 21 are arranged at the first axial end 19 of the first tubular portion 17.
In the preferred embodiment shown in the figures, the first axial end 19 has a connecting flange 22 fitted on the tubular element 6 and the fastening means 21 are adapted to mechanically constrain the connecting flange 22 to the tubular element 6. Appropriately, the ignition means 15, 16 and the combustion head 10 are firmly associated with the tubular element 6.
Usefully, the burner 1 comprises connecting means 23 of the ignition means 15, 16 to the tubular element 6 and the combustion head 10 is locked together with the tubular element 6.
Precisely, the connecting means 23 comprise a collar fitted on the tubular element 6 and supporting both the sensing electrode 15 and the ignition electrode 16.
As can be seen in Figures 3, 4 and 5, the combustion head 10 is locked together with the tubular element 6 at one of its axial ends.
Precisely, the dispensing means 11 comprise a dispensing body 24 which is mounted on the tubular element 6 where the outlet opening 9 is located.
Outlet holes 12 of the combustible fluid exiting the second duct 7 are cut on the dispensing body 24.
The diffusion means 13 comprise a diffusion body 25 substantially crownshaped and associated with the outer side surface of the tubular element 6 in the proximity of the outlet opening 9.
The apertures 14 for the exit of the comburent fluid from the first duct 3 are cut on the diffusion body 25.
Usefully, the burner 1 comprises abutment means 26 adapted to limit the sliding of the first tubular portion 17 in the direction of extraction from the second tubular portion 18.
In the particular embodiment shown in the figures, the abutment means 26 comprise an abutment body mounted at the end of the second tubular portion 18 opposite the end into which the first axial end 19 of the first tubular portion 17 is fitted in a sliding manner.
Such an abutment body protrudes within the second tubular portion 18.
As can be seen in Figure 1 and Figure 3, the connecting means 23 rest against the abutment body 26 in the end-of-stroke position as a result of the extraction of the first tubular portion 17 from the second tubular portion 18.
Similarly, the connecting flange 22 rests against the abutment body 26 in the end-of-stroke position as a result of the insertion of the first tubular portion 17 within the second tubular portion 18.
Advantageously, the burner 1 comprises cooling means 27 adapted to distribute a cooling fluid along at least one stretch of the outer surface of the tubular body 2.
Preferably, the cooling means 27 comprise at least one choking element 28 for choking the flow of the fluid communicating with the first duct 3 and adapted to cause the comburent fluid to partly exit the first duct 3 and to direct it onto the outer surface of the first tubular portion 17.
Usefully, within the first duct 3, an inter- space 29 is defined between the first tubular portion 17 and the second tubular portion 18. Thus, the inter-space 29 is bounded by the inner surface of the second tubular portion 18 and by the outer surface of the stretch of the first tubular portion 17 inserted within the second tubular portion 18.
The choking element 28 is set in communication with the inter-space 29.
With particular reference to the embodiment shown in the figures, it can be seen that the choking element 28 is arranged to surround the first tubular portion 17. In detail, the choking element 28 has a substantially plate-shaped conformation and is provided with a connecting hole 30 which is arranged around the first tubular portion 17 so as to develop centrally to the axis of development S.
Advantageously, the choking element 28 is provided with at least one slit 31 for the outflow of the comburent fluid from the first duct 3 towards the outer surface of the first tubular portion 17.
In the particular embodiment shown in the figures, the choking element 28 comprises a plurality of slits 31 arranged in a radial pattern around the connecting hole 30 and equidistant from each other.
The slits 31 thus defined communicate fluidically with the inter- space 29 and allow the comburent fluid to exit, partly, the first duct 3 so as to lap the outer surface of the first tubular portion 17.
Advantageously, the cooling means 27 comprise at least one outlet port 32 of the comburent fluid from the first duct 3 formed on the outer side surface of the first tubular portion 17.
With special reference to the embodiment shown in the figures, the cooling means 27 comprise a plurality of outlet ports 32 which are obtained where the second axial end 20 is located.
Precisely, the outlet ports 32 are positioned at the outlet mouth 5, arranged in a radial pattern thereto and equidistant from each other.
A further aspect of the present invention relates to the use of the burner 1 which comprises the following steps of: introducing a comburent fluid comprising at least air into the first duct 3; introducing a combustible fluid comprising at least hydrogen into the second duct 7; adjusting the position of the first tubular portion 17 with respect to the second tubular portion 18 depending on the percentage of hydrogen contained in the combustible fluid; mixing the comburent fluid and the combustible fluid in the combustion area A to obtain a mixture of the fluids; combustion of the mixture.
Specifically, the comburent fluid is introduced into the first duct 3 through the inlet mouth 4, while the combustible fluid is introduced into the second duct 7 through the inlet opening 8.
Preferably, the combustible fluid comprises a mixture of hydrogen and methane. Depending on the concentration of hydrogen within the combustible fluid, a flame of varying length is obtained at the outlet of the combustion head 10.
In this case, the flame length decreases proportionally as the percentage concentration of hydrogen increases with respect to the percentage concentration of methane.
Conveniently, the first tubular portion 17 is progressively moved in the direction of extraction by the second tubular portion 18 as the percentage of hydrogen in the combustible fluid increases and vice versa.
This makes it possible to keep the distance of the flame from the kiln walls as constant as possible over time. After making this type of adjustment, the comburent fluid flows into the combustion area A exiting the diffusion means 13 and, at the same time, the combustible fluid exits the dispensing means 11 being in the combustion area A where it mixes with the comburent fluid. The sensing electrode 15 senses the presence of the mixture and then the ignition electrode 16 triggers the combustion of the mixture itself, which generates a flame exiting the combustion head 10.
It has in practice been ascertained that the described invention achieves the intended objects. The special expedient of making the tubular body of the burner in two separate, slidingly associated portions, and the fact of firmly associating the combustion head, the ignition means and the tubular element with the movable portion allows the distance of the flame to be adjusted from the kiln walls, making it as constant as possible over time. In this way, it is possible to obtain a uniform and constant distribution of heat inside the kiln over time, which allows for uniform firing of artifacts and in a manner that conforms to the standards required for production.

Claims

1) Burner (1) for industrial kilns, comprising: at least one tubular body (2) extending longitudinally along an axis of development (S) and defining at least one first duct (3) for the flow of a comburent fluid towards a combustion area (A); at least one tubular element (6) associated with said tubular body (2), arranged within said first duct (3) and defining at least one second duct (7) for the flow of a combustible fluid; at least one combustion head (10) associated with said ducts (3, 7) in a fluid- operated manner and adapted to diffuse said fluids towards said combustion area (A); ignition means (15, 16) associated with said tubular body (2) and adapted to activate the combustion of the mixture of said fluids at said combustion area (A); characterized by the fact that: said tubular body (2) comprises at least one first tubular portion (17) and at least one second tubular portion (18), wherein said first tubular portion (17) is associated with said second tubular portion (18) in a sliding manner along said axis of development (S); said combustion head (10), said ignition means (15, 16) and said tubular element (6) are associated with said first tubular portion (17) and are movable jointly therewith during the relevant sliding along said axis of development (S).
2) Burner (1) according to claim 1, characterized by the fact that said first tubular portion (17) is insertable/extractable, at least partly, into/from said second tubular portion (18) as a result of the relevant sliding along said axis of development (S).
3) Burner (1) according to claim 1 or 2, characterized by the fact that said first tubular portion (17) has a first axial end (19) fitted inside said second tubular portion (18) and a second axial end (20), opposite said first axial end (19), arranged externally to said second tubular portion (18) and associated with said combustion head (10).
4) Burner (1) according to one or more of the preceding claims, characterized by the fact that it comprises fastening means (21) adapted to lock said tubular element (6) together with said first tubular portion (17) and by the fact that said ignition means (15, 16) and said combustion head (10) are locked together with said tubular element (6).
5) Burner (1) according to claim 4, characterized by the fact that said fastening means (21) are arranged at said first axial end (19) of said first tubular portion (17).
6) Burner (1) according to claim 5, characterized by the fact that said first axial end (19) has a connecting flange (22) fitted on said tubular element (6) and by the fact that said fastening means (21) are adapted to mechanically constrain said connecting flange (22) to said tubular element (6).
7) Burner (1) according to one or more of the preceding claims, characterized by the fact that it comprises connecting means (23) of said ignition means (15, 16) to said tubular element (6) and by the fact that said combustion head (10) is locked together with said tubular element (6).
8) Burner (1) according to one or more of the preceding claims, characterized by the fact it comprises abutment means (26) adapted to limit the sliding of said first tubular portion (17) in the direction of extraction from said second tubular portion (18).
9) Burner (1) according to one or more of the preceding claims, characterized by the fact that it comprises cooling means (27) adapted to distribute a cooling fluid along at least one stretch of the outer surface of said tubular body (2).
10) Burner (1) according to claim 9, characterized by the fact that said cooling means (27) comprise at least one choking element (28) for choking the flow of the fluid set in communication with said first duct (3) and adapted to cause the comburent fluid to partly exit from said first duct (3) and to direct it onto the outer surface of said first tubular portion (17).
11) Burner (1) according to claim 10, characterized by the fact that, within said first duct (3), between said first tubular portion (17) and said second tubular portion (18) is defined an inter-space (29) and by the fact that said choking element (28) is set in communication with said inter-space (29).
12) Burner (1) according to claim 11, characterized by the fact that said choking element (28) is arranged to surround said first tubular portion (17).
13) Burner (1) according to claim 11 or 12, characterized by the fact that said choking element (28) is provided with at least one slit (31) for the outflow of said comburent fluid from said first duct (3) towards the outer surface of said first tubular portion (17).
14) Burner (1) according to one or more of claims 9 to 13, characterized by the fact that said cooling means (27) comprise at least one outlet port (32) of said comburent fluid from said first duct (3) formed on the outer side surface of said first tubular portion (17).
15) Use of a burner (1) according to one or more of the preceding claims, characterized by the fact that it comprises the following phases of: introducing a comburent fluid comprising at least air into said first duct (3); introducing a combustible fluid comprising at least hydrogen into said second duct (7); adjusting the position of said first tubular portion (17) with respect to said second tubular portion (18) depending on the percentage of hydrogen contained in the combustible fluid; mixing said comburent fluid and said combustible fluid in said combustion area (A) to obtain a mixture of said fluids; combustion of said mixture.
16) Use according to claim 15, characterized by the fact that said combustible fluid comprises a mixture of hydrogen and methane.
17) Use according to claim 15 or 16, characterized by the fact that said first tubular portion (17) is progressively moved in the direction of extraction by said second tubular portion (18) as the percentage of hydrogen in the combustible fluid increases and vice versa.
PCT/IB2023/058081 2022-08-10 2023-08-10 Burner for industrial kilns WO2024033852A1 (en)

Applications Claiming Priority (2)

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IT202200017145 2022-08-10
IT102022000017145 2022-08-10

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011120597A1 (en) * 2010-03-29 2011-10-06 Ancora S.P.A. Burner with high flame stability, particularly for the thermal treatment of ceramic articles
CN103063023A (en) * 2012-08-14 2013-04-24 梁燕龙 Tunnel kiln automatic combustor and use method thereof
WO2015181762A1 (en) * 2014-05-28 2015-12-03 Siti - B&T Group S.P.A. Burner device for furnaces as well as furnace provided with such device
WO2015189717A1 (en) * 2014-06-12 2015-12-17 Siti - B&T Group S.P.A. Burner for industrial furnace, as well as industrial furnace provided with such burner
EP3559551B1 (en) * 2016-12-22 2021-01-27 Max Weishaupt GmbH Mixing device and burner head for a burner with reduced nox emissions

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011120597A1 (en) * 2010-03-29 2011-10-06 Ancora S.P.A. Burner with high flame stability, particularly for the thermal treatment of ceramic articles
CN103063023A (en) * 2012-08-14 2013-04-24 梁燕龙 Tunnel kiln automatic combustor and use method thereof
WO2015181762A1 (en) * 2014-05-28 2015-12-03 Siti - B&T Group S.P.A. Burner device for furnaces as well as furnace provided with such device
WO2015189717A1 (en) * 2014-06-12 2015-12-17 Siti - B&T Group S.P.A. Burner for industrial furnace, as well as industrial furnace provided with such burner
EP3559551B1 (en) * 2016-12-22 2021-01-27 Max Weishaupt GmbH Mixing device and burner head for a burner with reduced nox emissions

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