EP3155320A1 - Burner for industrial furnace, as well as industrial furnace provided with such burner - Google Patents

Burner for industrial furnace, as well as industrial furnace provided with such burner

Info

Publication number
EP3155320A1
EP3155320A1 EP15726700.6A EP15726700A EP3155320A1 EP 3155320 A1 EP3155320 A1 EP 3155320A1 EP 15726700 A EP15726700 A EP 15726700A EP 3155320 A1 EP3155320 A1 EP 3155320A1
Authority
EP
European Patent Office
Prior art keywords
tubular element
burner
duct
burner according
end nozzle
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.)
Granted
Application number
EP15726700.6A
Other languages
German (de)
French (fr)
Other versions
EP3155320B1 (en
Inventor
Lanfranco Cantarelli
Maurizio Caratti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siti B&T Group SpA
Original Assignee
Siti B&T Group SpA
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 SpA filed Critical Siti B&T Group SpA
Publication of EP3155320A1 publication Critical patent/EP3155320A1/en
Application granted granted Critical
Publication of EP3155320B1 publication Critical patent/EP3155320B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C3/00—Combustion apparatus characterised by the shape of the combustion chamber
    • F23C3/002—Combustion apparatus characterised by the shape of the combustion chamber the chamber having an elongated tubular form, e.g. for a radiant tube
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F23C9/06—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for completing combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2202/00—Fluegas recirculation
    • F23C2202/10—Premixing fluegas with fuel and combustion air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
    • F23C2900/03004—Tubular combustion chambers with swirling fuel/air flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
    • F23C2900/09002—Specific devices inducing or forcing flue gas recirculation

Definitions

  • the present invention refers to a burner for industrial furnaces.
  • the present invention also regards an industrial furnace provided with one or more of such burners.
  • furnaces adapted to attain the firing of articles such as ceramic tiles, bathroom fixtures and similar products - burners are used which, by using a gaseous fuel such as methane, generate heat energy and deliver it inside a portion of the furnace known as the firing chamber or channel, within which the products being fired are situated or move.
  • a gaseous fuel such as methane
  • a suitable number of such burners are installed inside the furnace according to the configuration most suitable in relation to the type of treated product; in the most typical applications, they are housed within respective through openings provided in the side walls of the furnace, with the respective nozzles afferent to the firing chamber.
  • such regenerative burners pick up a portion of the burnt fumes present in the firing chamber, and they mix it with the comburent air fed to the inlet of the burner. Following this mixing, the comburent air entering the burner is pre-heated: thus causes, as is known, an energy savings in terms of fuel fed to the burners.
  • types of burners comprise, along the inlet duct for the comburent air, a device or mechanism for creating a negative pressure field in fluid connection with a duct for sucking fumes coming from within the firing chamber.
  • the comburent air flow through the aforesaid device or mechanism itself causes, at the smallest diameter section of the tube, reduced pressure that causes the suction of the fumes along the duct afferent to the firing chamber, then mixing them with the comburent air.
  • the technical task of the present invention is to improve the state of the prior art.
  • one object of the present invention is to obtain a burner for industrial furnaces that allows overcoming the above-lamented drawbacks.
  • Another object of the present invention is to provide a burner for industrial furnaces characterised by high performances in terms of energy savings given the same quality of the obtained products.
  • a further object of the present invention is to implement a burner for industrial furnaces that is simple, effective and inexpensive from the structural and plant engineering standpoint.
  • Another object of the present invention is to implement a burner for industrial furnaces that allows adjusting the recovery of the combustion gases within the burner itself in the scope of a simple, effective solution with practical application. Such task and such objects are attained by a burner for industrial furnaces according to claim 1.
  • the burner according to the invention which can be installed in a furnace provided with at least one firing chamber, comprises a main tubular body provided with at least one first port for the inlet of a fuel, with at least one second port for the inlet of combustive agent, and with one end nozzle provided with an outlet mouth facing towards the firing chamber.
  • the burner also comprises means for triggering the combustion of the fuel - combustive agent mixture.
  • the burner also comprises at least one duct adapted to pick up a portion of the gases present within the firing chamber and to convey them at the outlet mouth of the end nozzle.
  • an industrial furnace comprising at least one burner according to the invention and with the above-described characteristics.
  • figure 1 is a side section view of a burner according to the present invention, in a first operative position, housed within a wall of an industrial furnace;
  • figure 2 is a side section view of a burner pursuant to figure 1 in a second operative position
  • a burner for industrial furnace according to the present invention is indicated overall with the reference number 1.
  • the burner 1 according to the invention is provided inside an industrial furnace, indicated overall with the reference number 2, for firing products such as ceramic tiles as well as bathroom fixtures and similar products.
  • the furnace 2 comprises a firing chamber 3.
  • the walls 4 can for example be made of refractory material, or of any one other material suitable for thermally insulating the firing chamber 3 from the outside environment.
  • the furnace 2 can comprise an indefinite number of burners 1 according to the present invention; the burners 1 can be arranged, in the scope of the furnace 2, according to any one configuration suitable for obtaining the desired temperature within the firing chamber 3.
  • the burners 1 are arranged in succession along the direction of advancement of the products inside the furnace 2.
  • the burner 1 comprises a main tubular body 6.
  • the main tubular body 6 comprises at least one first port 7 for the inlet of a fuel.
  • the fuel can be constituted by methane, or by another fluid with suitable properties.
  • the fuel can be constituted by methane extractable from coal fields, so-called "coal gas”.
  • the main tubular body 6 also comprises at least one second port 8 for the inlet of combustive agent.
  • the combustive agent is normally constituted by air, possibly preheated to a certain temperature.
  • the main tubular body 6 comprises a first portion 6a and a second portion 6b, coaxial with respect to each other.
  • Second port 8 for the inlet of the combustive agent is provided in the portion 6a.
  • the first portion 6a comprises a rear end 6c in which the first port 7 is obtained for the inlet of the fuel.
  • the first port 7 in particular communicates with a fuel supply manifold 9, coaxial with the main tubular body 6.
  • the manifold 9 terminates with a delivery head 10 provided with respective lateral holes, adapted to inject the fuel inside the volume delimited by the main tubular body 6.
  • generation means of a turbine 1 1 Associated with the delivery head 10 are generation means of a turbine 1 1 , adapted to generate turbulence in the fuel - combustive agent mixture.
  • the generation means of a turbine 1 1 comprise, for example, a deflector with discoid form with grooved side surface, or another equivalent element.
  • means 12 are provided for triggering the combustion of the fuel-combustive agent mixture.
  • Such trigger means 12 are of essentially known type in these applications, and are adapted to determine the striking of a spark that lights the mixture.
  • means 13 for detecting the flame are provided.
  • Such detection means 13 are also of known type in these applications.
  • the trigger means 12 and the detection means 13, along with other components of the burner 1 , are both served, through respective connection portions 12a, 13 a, by a unit for controlling and managing the operation of the furnace 2 itself; such unit is not represented in the enclosed figures, but it is of known, conventional type, constituted for example by a programmable logic controller or other equivalent devices.
  • the second portion 6b of the main tubular body 6 is associated with the first portion 6a at a flanged collar 14.
  • the aforesaid second portion 6b comprises an end nozzle 15.
  • the end nozzle 15, with substantially frustoconical or in any case convergent shape, is provided with an outlet mouth 16 which, during use, faces towards the firing chamber 3.
  • the burner 1 comprises at least one duct 17 adapted, during use, to pick up a portion of the gases present within the firing chamber 3, and to convey such gases at the outlet mouth 16 of the end nozzle 15.
  • the end nozzle 15 is positioned, with its outlet mouth 16, at a first predetermined distance Dl from the firing chamber 3.
  • the end nozzle 15 can be positioned, with its outlet mouth 16, at a first predetermined distance Dl from the inner surface 4a of the wall 4 of the furnace 2.
  • Such positioning of the outlet mouth 16 of the end nozzle 15 with respect to the firing chamber 3 allows providing for the aforesaid duct 17 suitably through the thickness of the wall 4 itself.
  • the burner 1 comprising at least one tubular element 18.
  • tubular element 18 is arranged within the through channel 5 together with the main tubular body 6, and downstream thereof with reference to the direction of the flow of the fuel-combustive agent mixture towards the firing chamber 3.
  • the first opening 18a is arranged at a second predetermined distance D2 from outlet mouth 16, when the tubular element 18 and the end nozzle 15 are arranged in a first operative position (see figure 1).
  • the tubular element 18 also comprises a second opening 18b.
  • the second opening 18b is directly afferent to the firing chamber 3.
  • the edge of the second opening 18b is substantially arranged on the plane defined by the inner surface 4a of the wall 4.
  • the end nozzle 15 and/or the tubular element 18 are mutually movable along the duct 17 in order to vary the width of the passage section delimited therebetween.
  • the end nozzle 15 and the tubular element 18 can be mutually positioned between at least the aforesaid first operative position, in which the duct 17 is in fluid communication with the outlet mouth 16 of the end nozzle, and a further operative position of obstruction of the above-indicated passage section, in which the fluid communication between the duct 17 and the outlet mouth 16 is prevented.
  • the main tubular body 6 and the tubular element 18 are arranged coaxial, or substantially coaxial, inside the duct 17; the latter, during use, is in turn positionable within the through channel 5.
  • the tubular element 18 could have a different positioning with respect to the main tubular body 6: for example, the tubular element 18 could be arranged along an axis parallel to that of the main tubular body 6, or the two components could be arranged along incident axes, in relation to particular application requirements.
  • the duct 17 comprises, or better yet is constituted by, a gap defined between the tubular element 18 and the through channel 5, as is clearly illustrated in figure 1.
  • the tubular element 18 could have a different positioning with respect to the axis of the through channel 5
  • the conformation of the duct 17 - i.e. of the gap - could consequently be different from that described above.
  • the duct 17 could comprise, rather than a single gap, a series of parallel or substantially parallel gaps, separated from each other by means of walls, separators, deflectors or other similar elements, defined for example along the outer surface of the tubular element 18, or separated from the latter.
  • the burner 1 comprises at least one sleeve 19, inserted inside the through channel 5.
  • the duct 17 comprises at least one sleeve 19.
  • the sleeve 19 can be made of a single piece or it can be constituted by multiple coaxial sections of equal diameter (see figures 1-3).
  • the sleeve abuts against an abutment surface 19a provided inside the through channel 5.
  • the sleeve 19 accomplishes various functions.
  • the sleeve 19 allows the easy insertion of the tubular element 18 and/or of the main tubular body 6 within the through channel 5, an insertion which preferably occurs from the external side of the furnace 2.
  • Such insertion could in fact be difficult if it should occur directly within a channel made through the refractory material, which could in fact have rough and/or irregular inner surfaces.
  • the air volume comprised between the sleeve 19 and the second portion 6b of the main tubular body 6 suitably acts as heat insulation.
  • the sleeve 19 also provides effective support to the tubular element 18, which as stated is simply inserted therein.
  • the tubular element 18 comprises supporting means 20, adapted to support the tubular element 18 itself within the duct 17, so as to define the aforesaid gap.
  • the supporting means 20 are adapted to support the tubular element 18 within the sleeve 19.
  • the supporting means 20 are adapted to support the tubular element 18 within the through channel 5 itself.
  • the aforesaid supporting means 20 comprise at least two lower bases integral with the tubular element 18 (see figures 1 and 2); the lower bases are adapted to rest on the inner surface of the duct 17, i.e. of the sleeve 19.
  • the supporting means 20 could be constituted by removable elements inserted between the duct 17, i.e. between the sleeve 19, and the tubular element 18.
  • the supporting means 20 can comprise at least one baffle 20'.
  • the at least one baffle 20' that is extended along the duct 17 and is configured in a manner such to offer the least resistance to the passage of the portion of the gases drawn again into the burner.
  • baffles 20' are depicted in equidistant position with respect to each other. Nevertheless, further embodiments are possible comprising a greater or lesser number of baffles 20' without departing from the protective scope of the present invention.
  • the supporting means 20 of the tubular element 18 abut against the abutment surface 19a of the through channel 5, in a manner so as to prevent the tubular element 18 itself from penetrating inside the firing chamber 3.
  • the tubular element 18 has preferably cylindrical conformation, with constant cross section along its length.
  • tubular element 18 could have different conformation, in relation to specific application requirements and/or to the obtainment of specific technical results.
  • the burner 1 according to the invention comprises means 21 for adjusting the operative position of said end nozzle 15 with respect to said tubular element 18.
  • the adjustment means 21 are configured for simply and effectively adjusting the relative position between the end nozzle 15 and the tubular element 18, and more precisely between the outlet mouth 16 and the first opening 18a, at least between two limit operative positions that are opposite each other.
  • the adjustment means 21 it is possible to vary the amplitude of the passage section delimited between the end nozzle 15 and the tubular element 18, allowing or preventing the fluid communication between the duct 17 and the outlet mouth 16 of the end nozzle 15.
  • the adjustment means 21 therefore allow the adjustment of the flow rate of the gases that can be drawn again into the burner itself.
  • said adjustment means 21 comprise at least one spacer 22.
  • the spacer 22 is interposed between the collar 14 of the main tubular body 6 and abutment means 23 associable at one end of the duct 17 through which the main body 6 is introduced.
  • the abutment means 23 are associated with the wall 4 of the furnace 2.
  • the spacer 22 clearly allows mounting the main tubular body 6 of the burner 1 , within the through channel 5, in a manner so as to obtain the aforesaid second predetermined distance D2 between the outlet mouth 16 of the end nozzle 15 and the first opening 18a of the tubular element 18.
  • the second predetermined distance D2 can be simply and quickly varied by substituting the spacer 22 with another spacer of different thickness.
  • the adjustment means 21 can be of mechanical type with manual actuation.
  • the adjustment means 21 can comprise a linear guide, or another equivalent means, to which at least one between the end nozzle 15 and the tubular element 18 are slidably associated, and means for controlling the movement thereof. By operating the control means, it is possible to manually translate at least one between the end nozzle and the tubular element 18 in order to vary the second predetermined distance D2.
  • the adjustment means 21 can be of automated type, in order to avoid having to conduct manual operations on the burner 1.
  • the aforesaid adjustment means 21 can comprise a linear actuator, or other equivalent means, associated with the main tubular body 6 of the burner 1 , such that the main tubular body 6 can be controlled to translate along the axis of the through channel 5 in order to vary the second predetermined distance D2.
  • the abutment means 23 associated with the wall 4 of the furnace 2 comprise, more in detail, an annular support.
  • the annular support 23 is fixed to the outer surface 4b of the wall 4 of the furnace 2, at the through channel 5.
  • the annular support 23 comprises an axial cavity 24 which at least partially houses the main tubular body 6.
  • the annular support 23 is made of thermally insulating material, e.g. ceramic fiber or another refractory material.
  • means are provided for cooling the main tubular body 6, in the area close to the end nozzle 15.
  • cooling means can be of fresh-air blowing type, or of any other equivalent type.
  • the first opening 18a of the tubular element 18 is sized in a manner so as to allow the at least partial insertion of the end nozzle 15 at its interior.
  • the operation of the burner 1 according to the present invention, associated with an industrial furnace, is as follows.
  • the combustion conditions are, as stated, marked by a certain deficiency of air.
  • Such gases are suctioned inside the tubular element 18, through the passage section delimited between the end nozzle 15 and the tubular element 18, in a manner schematized with the arrows G in figure 1.
  • Such gases are mixed herein with those coming from the outlet mouth 16 of the burner, the latter being mainly constituted by combustion fumes and by residual fuel and combustive agent, i.e. which did not react inside the main tubular body 6.
  • One of the results that is obtained is therefore that of recovering a significant portion of the heat energy associated with the gases present within the firing chamber 3, in order to improve the combustion yields of the components supplied through the burner 1 , with particular savings on the fuel necessary for obtaining a specific temperature inside the firing chamber 3.
  • the adjustment of the second predetermined distance D2 allows varying the passage section for the gases coming from the firing chamber 3 through the duct 17.
  • Illustrated in figure 2 is an operative configuration of the burner 1 in which the passage section between the end nozzle 15 and the tubular element 18, along the duct 17, is obstructed, i.e. there is no suction of the gases coming from the firing chamber 3.
  • FIG. 3 Schematically illustrated in figure 3 are the limit operative positions assumed by the end nozzle 15, which in a first operative position, in order to allow the suction of the gases, is depicted with a solid line section, and which in a further operative position - preventing the suction of the gases - is depicted with a dashed line section.
  • the passage section for the gases coming from the firing chamber has maximum width
  • the aforesaid passage section for the gases is obstructed, actually preventing the fluid communication between the duct 17 and the outlet mouth 16 of the end nozzle 15.
  • the burner 1 operates according to conventional and known operating modes.
  • the solution is in practice obtained, with respect to the configuration of figure 1 , by removing the spacer 22, in a manner so as to insert the end nozzle 15 within the first opening 18a of the tubular element 18.
  • the proposed structural solution has also proven to be decidedly simple and inexpensive with respect to the previously-proposed solutions, mainly from the structural and plant engineering standpoint.
  • a furnace 2 comprising at least one firing chamber 3 delimited by at least one wall 4 having at least one through channel 5, and also comprising at least one burner 1 having the above-described characteristics, inserted in the aforesaid through channel 5.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Gas Burners (AREA)

Abstract

A burner for industrial furnace, which can be installed in a furnace (2) comprising at least one firing chamber (3), the burner comprises a main tubular body (6) provided with at least one first port (7) for the inlet of a fuel, with at least one second port (8) for the inlet of combustive agent, and with an end nozzle (15) provided with an outlet mouth (16) facing towards the firing chamber (3), and elements (12) for triggering combustion of the fuel - combustive agent mixture. The burner also comprises at least one duct (17) adapted to pick up a portion of the gases present within the firing chamber (3) and to convey them at the outlet mouth (16) of the end nozzle (15).

Description

Description of the Industrial Invention Patent having as title:
"BURNER FOR INDUSTRIAL FURNACE, AS WELL AS INDUSTRIAL FURNACE
PROVIDED WITH SUCH BURNER"
Designated inventors: Lanfranco Cantarelli, Maurizio Caratti
TECHNICAL FIELD OF THE INVENTION
The present invention refers to a burner for industrial furnaces.
More particularly, the present invention refers to a burner with heat energy recovery for industrial furnaces adapted for firing articles such as ceramic tiles, bathroom fixtures and the like.
The present invention also regards an industrial furnace provided with one or more of such burners.
STATE OF THE PRIOR ART
In the field of industrial furnaces - with particular but non-exclusive reference to the furnaces adapted to attain the firing of articles such as ceramic tiles, bathroom fixtures and similar products - burners are used which, by using a gaseous fuel such as methane, generate heat energy and deliver it inside a portion of the furnace known as the firing chamber or channel, within which the products being fired are situated or move.
A suitable number of such burners are installed inside the furnace according to the configuration most suitable in relation to the type of treated product; in the most typical applications, they are housed within respective through openings provided in the side walls of the furnace, with the respective nozzles afferent to the firing chamber.
As is known, the fumes produced inside the furnace, following the combustion actuated by the burners, are expelled into the environment by means of filtering and treatment of the same.
In order to recover at least one portion of the heat energy associated with the combustion products present within the firing chamber, different types of burners have been developed in the field, generically defined as regenerative burners.
In practice, such regenerative burners pick up a portion of the burnt fumes present in the firing chamber, and they mix it with the comburent air fed to the inlet of the burner. Following this mixing, the comburent air entering the burner is pre-heated: thus causes, as is known, an energy savings in terms of fuel fed to the burners. In brief, such types of burners comprise, along the inlet duct for the comburent air, a device or mechanism for creating a negative pressure field in fluid connection with a duct for sucking fumes coming from within the firing chamber.
The comburent air flow through the aforesaid device or mechanism itself causes, at the smallest diameter section of the tube, reduced pressure that causes the suction of the fumes along the duct afferent to the firing chamber, then mixing them with the comburent air.
Such process, as stated, allows recovering part of the enthalpic content present in the burnt fumes and transferring it to the comburent air, preheating it, with the known advantages indicated above.
The above-described technical solutions are however not deemed fully satisfactory at present, since they can only be actuated at the price of considerably complicated plant engineering, which sometimes is not sustainable with regard to the costs and/or the operations necessary for installation.
In addition, another considerable limit of the above-described technical solutions consists of the fact that, due to the management of comburent air mixed with high- temperature fumes outside the combustion chamber, the tubes involved reach very high temperatures, and hence require suitable insulation that is complex in the making thereof.
OBJECTS OF THE INVENTION
The technical task of the present invention is to improve the state of the prior art.
In the scope of such technical task, one object of the present invention is to obtain a burner for industrial furnaces that allows overcoming the above-lamented drawbacks. Another object of the present invention is to provide a burner for industrial furnaces characterised by high performances in terms of energy savings given the same quality of the obtained products.
A further object of the present invention is to implement a burner for industrial furnaces that is simple, effective and inexpensive from the structural and plant engineering standpoint.
Another object of the present invention is to implement a burner for industrial furnaces that allows adjusting the recovery of the combustion gases within the burner itself in the scope of a simple, effective solution with practical application. Such task and such objects are attained by a burner for industrial furnaces according to claim 1.
The burner according to the invention, which can be installed in a furnace provided with at least one firing chamber, comprises a main tubular body provided with at least one first port for the inlet of a fuel, with at least one second port for the inlet of combustive agent, and with one end nozzle provided with an outlet mouth facing towards the firing chamber.
The burner also comprises means for triggering the combustion of the fuel - combustive agent mixture.
According to one aspect of the invention, the burner also comprises at least one duct adapted to pick up a portion of the gases present within the firing chamber and to convey them at the outlet mouth of the end nozzle.
Due to this solution, it is possible to obtain the remixing of the gases at the outlet from the end nozzle of the burner with gases coming from the firing chamber, obtaining beneficial effects in terms of energy efficiency together with a considerable simplification from the structural and plant engineering standpoint.
In accordance with another aspect of the present invention, an industrial furnace is provided according to claim 21 , comprising at least one burner according to the invention and with the above-described characteristics.
The dependent claims refer to preferred and advantageous embodiments of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
Further characteristics and advantages of the present invention will be clearer from the detailed description of a preferred but not exclusive embodiment of a burner for industrial furnace, illustrated as a non-limiting example in the enclosed set of drawings in which:
figure 1 is a side section view of a burner according to the present invention, in a first operative position, housed within a wall of an industrial furnace;
figure 2 is a side section view of a burner pursuant to figure 1 in a second operative position;
figure 3 is a side section view of a burner according to the present invention in a first operative position; figure 4 is a detailed front view of one component of the burner pursuant to figure 3.
EMBODIMENTS OF THE INVENTION
With reference to figure 1 , a burner for industrial furnace according to the present invention is indicated overall with the reference number 1.
The burner 1 according to the invention is provided inside an industrial furnace, indicated overall with the reference number 2, for firing products such as ceramic tiles as well as bathroom fixtures and similar products.
The furnace 2 comprises a firing chamber 3.
The firing chamber 3 is delimited by walls 4.
The walls 4 can for example be made of refractory material, or of any one other material suitable for thermally insulating the firing chamber 3 from the outside environment. Of course, the furnace 2 can comprise an indefinite number of burners 1 according to the present invention; the burners 1 can be arranged, in the scope of the furnace 2, according to any one configuration suitable for obtaining the desired temperature within the firing chamber 3.
For example, if the furnace 2 is of tunnel type for firing products such as ceramic tiles and the like, the burners 1 are arranged in succession along the direction of advancement of the products inside the furnace 2.
Any other arrangement of the burners 1 and/or any other conformation of the furnace 2 can be conceived without constituting limitations of the objects of the present invention. Each burner 1 provided in the furnace 2 is housed in a respective through channel 5 provided in one or more of the walls 4 of the furnace 2 itself.
The burner 1 comprises a main tubular body 6.
The main tubular body 6 comprises at least one first port 7 for the inlet of a fuel.
According to one version of the present invention, the fuel can be constituted by methane, or by another fluid with suitable properties.
According to a further version of the present invention, the fuel can be constituted by methane extractable from coal fields, so-called "coal gas".
The main tubular body 6 also comprises at least one second port 8 for the inlet of combustive agent.
The combustive agent is normally constituted by air, possibly preheated to a certain temperature.
More in detail, the main tubular body 6 comprises a first portion 6a and a second portion 6b, coaxial with respect to each other.
Second port 8 for the inlet of the combustive agent is provided in the portion 6a.
In addition, the first portion 6a comprises a rear end 6c in which the first port 7 is obtained for the inlet of the fuel.
The first port 7 in particular communicates with a fuel supply manifold 9, coaxial with the main tubular body 6.
The manifold 9 terminates with a delivery head 10 provided with respective lateral holes, adapted to inject the fuel inside the volume delimited by the main tubular body 6. Associated with the delivery head 10 are generation means of a turbine 1 1 , adapted to generate turbulence in the fuel - combustive agent mixture.
The generation means of a turbine 1 1 comprise, for example, a deflector with discoid form with grooved side surface, or another equivalent element.
Within the main tubular body 6, means 12 are provided for triggering the combustion of the fuel-combustive agent mixture.
Such trigger means 12 are of essentially known type in these applications, and are adapted to determine the striking of a spark that lights the mixture.
Still within the main tubular body 6 of the burner 1 , means 13 for detecting the flame are provided.
Such detection means 13 are also of known type in these applications.
The trigger means 12 and the detection means 13, along with other components of the burner 1 , are both served, through respective connection portions 12a, 13 a, by a unit for controlling and managing the operation of the furnace 2 itself; such unit is not represented in the enclosed figures, but it is of known, conventional type, constituted for example by a programmable logic controller or other equivalent devices.
The second portion 6b of the main tubular body 6 is associated with the first portion 6a at a flanged collar 14.
The aforesaid second portion 6b comprises an end nozzle 15.
The end nozzle 15, with substantially frustoconical or in any case convergent shape, is provided with an outlet mouth 16 which, during use, faces towards the firing chamber 3. According to one aspect of the present invention, the burner 1 comprises at least one duct 17 adapted, during use, to pick up a portion of the gases present within the firing chamber 3, and to convey such gases at the outlet mouth 16 of the end nozzle 15.
The specific function of the aforesaid duct 17, in the scope of the operation of the burner 1 according to the invention, will be clearer hereinbelow.
As illustrated in figure 1 , and according to another aspect of the present invention, during use, the end nozzle 15 is positioned, with its outlet mouth 16, at a first predetermined distance Dl from the firing chamber 3.
In other words, during use, the end nozzle 15 can be positioned, with its outlet mouth 16, at a first predetermined distance Dl from the inner surface 4a of the wall 4 of the furnace 2.
Such positioning of the outlet mouth 16 of the end nozzle 15 with respect to the firing chamber 3 allows providing for the aforesaid duct 17 suitably through the thickness of the wall 4 itself.
According to a further aspect of the present invention, the burner 1 comprising at least one tubular element 18.
The tubular element 18 is arranged within the through channel 5.
In particular, the tubular element 18 is arranged within the through channel 5 together with the main tubular body 6, and downstream thereof with reference to the direction of the flow of the fuel-combustive agent mixture towards the firing chamber 3.
For such purpose, it is observed that the tubular element 18 is arranged downstream of the outlet mouth 16 of the end nozzle 15 within the duct 17. In turn, the duct 17 can be positioned within the through channel 5 (see figures 1 and 2).
The end nozzle 15 and the tubular element 18 together delimit a passage section for the fluid communication between the at least one duct 17 and the outlet mouth 16.
The tubular element 18 comprises a first opening 18a.
The first opening 18a is communicating with the outlet mouth 16 of the end nozzle 15, i.e. it faces the latter.
More in detail, the first opening 18a is arranged at a second predetermined distance D2 from outlet mouth 16, when the tubular element 18 and the end nozzle 15 are arranged in a first operative position (see figure 1).
The effects of such positioning of the tubular element 18 with respect to the main tubular body 6 will be clearer hereinbelow. The tubular element 18 also comprises a second opening 18b.
The second opening 18b is directly afferent to the firing chamber 3.
In other words, the edge of the second opening 18b is substantially arranged on the plane defined by the inner surface 4a of the wall 4.
According to one aspect of the present invention, the end nozzle 15 and/or the tubular element 18 are mutually movable along the duct 17 in order to vary the width of the passage section delimited therebetween.
The end nozzle 15 and the tubular element 18 can be mutually positioned between at least the aforesaid first operative position, in which the duct 17 is in fluid communication with the outlet mouth 16 of the end nozzle, and a further operative position of obstruction of the above-indicated passage section, in which the fluid communication between the duct 17 and the outlet mouth 16 is prevented.
Preferably, the main tubular body 6 and the tubular element 18 are arranged coaxial, or substantially coaxial, inside the duct 17; the latter, during use, is in turn positionable within the through channel 5.
In other embodiments of the invention, not represented in the figures, the tubular element 18 could have a different positioning with respect to the main tubular body 6: for example, the tubular element 18 could be arranged along an axis parallel to that of the main tubular body 6, or the two components could be arranged along incident axes, in relation to particular application requirements.
According to a preferred embodiment of the invention, the duct 17 comprises, or better yet is constituted by, a gap defined between the tubular element 18 and the through channel 5, as is clearly illustrated in figure 1.
The gap that constitutes the duct 17 - or which is part thereof - has, in the embodiment illustrated in the figures, annular or substantially annular form, since the tubular element
18 is arranged substantially along the axis of symmetry of the through channel 5.
In other embodiments of the invention, in which the tubular element 18 could have a different positioning with respect to the axis of the through channel 5, the conformation of the duct 17 - i.e. of the gap - could consequently be different from that described above.
For example, in some embodiments of the invention, the duct 17 could comprise, rather than a single gap, a series of parallel or substantially parallel gaps, separated from each other by means of walls, separators, deflectors or other similar elements, defined for example along the outer surface of the tubular element 18, or separated from the latter. According to still another aspect of the present invention, the burner 1 comprises at least one sleeve 19, inserted inside the through channel 5.
According to one version of the present invention, the duct 17 comprises at least one sleeve 19.
Housed within the sleeve 19 are, in succession, the main tubular body 6 and the tubular element 18, which as stated are coaxial or substantially coaxial with each other.
The sleeve 19 can be made of a single piece or it can be constituted by multiple coaxial sections of equal diameter (see figures 1-3).
The sleeve abuts against an abutment surface 19a provided inside the through channel 5. The sleeve 19 accomplishes various functions.
Firstly, the sleeve 19 allows the easy insertion of the tubular element 18 and/or of the main tubular body 6 within the through channel 5, an insertion which preferably occurs from the external side of the furnace 2.
Such insertion could in fact be difficult if it should occur directly within a channel made through the refractory material, which could in fact have rough and/or irregular inner surfaces.
In addition the sleeve 19, as better clarified hereinbelow, ensures that the inner surfaces of the duct 17 are sufficiently clean and suitable for conveying the gases coming from the interior of the firing chamber 3 at the outlet mouth 16 of the main tubular body 6 of the burner 1.
The air volume comprised between the sleeve 19 and the second portion 6b of the main tubular body 6 suitably acts as heat insulation.
The sleeve 19 also provides effective support to the tubular element 18, which as stated is simply inserted therein.
For such purpose, it is observed that the tubular element 18 comprises supporting means 20, adapted to support the tubular element 18 itself within the duct 17, so as to define the aforesaid gap.
According to one version of the present invention, if the duct 17 comprises at least one sleeve 19, the supporting means 20 are adapted to support the tubular element 18 within the sleeve 19. During use, with the burner inserted inside the through channel 5, the supporting means 20 are adapted to support the tubular element 18 within the through channel 5 itself. More in detail, according to one version of the present invention, the aforesaid supporting means 20 comprise at least two lower bases integral with the tubular element 18 (see figures 1 and 2); the lower bases are adapted to rest on the inner surface of the duct 17, i.e. of the sleeve 19.
In other embodiments of the invention, the supporting means 20 could be constituted by removable elements inserted between the duct 17, i.e. between the sleeve 19, and the tubular element 18.
According to a further embodiment illustrated in the enclosed figures 3 and 4, the supporting means 20 can comprise at least one baffle 20'.
According to such embodiment, the at least one baffle 20' that is extended along the duct 17 and is configured in a manner such to offer the least resistance to the passage of the portion of the gases drawn again into the burner.
With reference to the detailed view of a component of the burner illustrated in figure 4, three baffles 20' are depicted in equidistant position with respect to each other. Nevertheless, further embodiments are possible comprising a greater or lesser number of baffles 20' without departing from the protective scope of the present invention. The supporting means 20 of the tubular element 18 abut against the abutment surface 19a of the through channel 5, in a manner so as to prevent the tubular element 18 itself from penetrating inside the firing chamber 3.
The tubular element 18 has preferably cylindrical conformation, with constant cross section along its length.
In other embodiments, the tubular element 18 could have different conformation, in relation to specific application requirements and/or to the obtainment of specific technical results.
The burner 1 according to the invention comprises means 21 for adjusting the operative position of said end nozzle 15 with respect to said tubular element 18.
More precisely, the adjustment means 21 are configured for simply and effectively adjusting the relative position between the end nozzle 15 and the tubular element 18, and more precisely between the outlet mouth 16 and the first opening 18a, at least between two limit operative positions that are opposite each other. In practice, by means of the adjustment means 21 it is possible to vary the amplitude of the passage section delimited between the end nozzle 15 and the tubular element 18, allowing or preventing the fluid communication between the duct 17 and the outlet mouth 16 of the end nozzle 15.
The adjustment means 21 therefore allow the adjustment of the flow rate of the gases that can be drawn again into the burner itself.
According to one version of the present invention, said adjustment means 21 comprise at least one spacer 22.
The spacer 22 is interposed between the collar 14 of the main tubular body 6 and abutment means 23 associable at one end of the duct 17 through which the main body 6 is introduced.
During use, the abutment means 23 are associated with the wall 4 of the furnace 2.
The spacer 22 clearly allows mounting the main tubular body 6 of the burner 1 , within the through channel 5, in a manner so as to obtain the aforesaid second predetermined distance D2 between the outlet mouth 16 of the end nozzle 15 and the first opening 18a of the tubular element 18.
The second predetermined distance D2 can be simply and quickly varied by substituting the spacer 22 with another spacer of different thickness.
Of course, such variation also allows modifying the first predetermined distance Dl , i.e. that provided between the outlet mouth 16 and the firing chamber 3.
According to a further embodiment of the invention, not illustrated in the figures, the adjustment means 21 can be of mechanical type with manual actuation.
By way of example, the adjustment means 21 can comprise a linear guide, or another equivalent means, to which at least one between the end nozzle 15 and the tubular element 18 are slidably associated, and means for controlling the movement thereof. By operating the control means, it is possible to manually translate at least one between the end nozzle and the tubular element 18 in order to vary the second predetermined distance D2.
In other embodiments of the invention, the adjustment means 21 can be of automated type, in order to avoid having to conduct manual operations on the burner 1.
For example, the aforesaid adjustment means 21 can comprise a linear actuator, or other equivalent means, associated with the main tubular body 6 of the burner 1 , such that the main tubular body 6 can be controlled to translate along the axis of the through channel 5 in order to vary the second predetermined distance D2.
The abutment means 23 associated with the wall 4 of the furnace 2 comprise, more in detail, an annular support.
The annular support 23 is fixed to the outer surface 4b of the wall 4 of the furnace 2, at the through channel 5.
The annular support 23 comprises an axial cavity 24 which at least partially houses the main tubular body 6.
The annular support 23 is made of thermally insulating material, e.g. ceramic fiber or another refractory material.
In one embodiment of the invention, at such annular support 23, means are provided for cooling the main tubular body 6, in the area close to the end nozzle 15.
For example, such cooling means can be of fresh-air blowing type, or of any other equivalent type.
As is observed in particular in figure 2, the first opening 18a of the tubular element 18 is sized in a manner so as to allow the at least partial insertion of the end nozzle 15 at its interior.
In this manner, the fluid communication between the duct 17 and the outlet mouth 16 of the end nozzle 15 can be prevented.
The operation of the burner 1 according to the present invention, associated with an industrial furnace, is as follows.
In normal operating conditions, in the main tubular body 6, there is the partial combustion of the fuel supplied by the delivery head 10, which reacts with the comburent air coming from the second port 8.
The combustion conditions are, as stated, marked by a certain deficiency of air.
The flow of gases that exit from the outlet mouth 16 of the end nozzle 15 is channeled into the tubular element 18.
If a non-zero second predetermined distance D2 is set between the outlet mouth 16 and the first opening 18a, first operative position, there is a suction effect of the gases contained within the firing chamber 3 through the duct 17, characterized by a defined content of residual oxygen.
Such gases are suctioned inside the tubular element 18, through the passage section delimited between the end nozzle 15 and the tubular element 18, in a manner schematized with the arrows G in figure 1.
Such gases are mixed herein with those coming from the outlet mouth 16 of the burner, the latter being mainly constituted by combustion fumes and by residual fuel and combustive agent, i.e. which did not react inside the main tubular body 6.
In particular, the constant remixing allows, among other things, heating the aforesaid residual fuel and combustive agent, in a manner so as to facilitate their subsequent reaction, which occurs partly within the tubular element 18, and partly within the firing chamber 3, towards which they are directed.
One of the results that is obtained is therefore that of recovering a significant portion of the heat energy associated with the gases present within the firing chamber 3, in order to improve the combustion yields of the components supplied through the burner 1 , with particular savings on the fuel necessary for obtaining a specific temperature inside the firing chamber 3.
In addition, it must be observed that the above-described phenomenon allows reducing the emission of pollutants which must then be treated upon discharge, such as carbon monoxide (CO), carbon dioxide (C02) and nitrogen oxides (NOx).
In an entirely intuitive manner, the adjustment of the second predetermined distance D2 allows varying the passage section for the gases coming from the firing chamber 3 through the duct 17.
In other words, such adjustment allows varying the flow rate of the gases that flow through the duct 17.
It is observed that by modifying the relative position between the end nozzle 15 and the tubular element 18 with respect to the aforesaid first operative position, one varies the amplitude of the passage section for the gases drawn back into the burner and, consequently, the flow rate of the gases themselves into the burner.
Consequently, it is possible to modulate the above-described remixing effect as desired, as well as the technical effects that derive therefrom.
Illustrated in figure 2 is an operative configuration of the burner 1 in which the passage section between the end nozzle 15 and the tubular element 18, along the duct 17, is obstructed, i.e. there is no suction of the gases coming from the firing chamber 3.
Schematically illustrated in figure 3 are the limit operative positions assumed by the end nozzle 15, which in a first operative position, in order to allow the suction of the gases, is depicted with a solid line section, and which in a further operative position - preventing the suction of the gases - is depicted with a dashed line section.
In practice, in the first operative position, the passage section for the gases coming from the firing chamber has maximum width, while in the further operative position (second operative position), the aforesaid passage section for the gases is obstructed, actually preventing the fluid communication between the duct 17 and the outlet mouth 16 of the end nozzle 15.
This is clearly a limit operation condition in which it is not intended to exploit the effects following the suction of gases from the firing chamber 3.
Hence, in this situation, the burner 1 operates according to conventional and known operating modes.
The solution is in practice obtained, with respect to the configuration of figure 1 , by removing the spacer 22, in a manner so as to insert the end nozzle 15 within the first opening 18a of the tubular element 18.
The proposed structural solution has also proven to be decidedly simple and inexpensive with respect to the previously-proposed solutions, mainly from the structural and plant engineering standpoint.
Also forming an object of the present invention is a furnace 2 comprising at least one firing chamber 3 delimited by at least one wall 4 having at least one through channel 5, and also comprising at least one burner 1 having the above-described characteristics, inserted in the aforesaid through channel 5.
The invention thus conceived is susceptible of numerous modifications and variants, all falling within the inventive concept.
In addition, all details can be substituted by other technically equivalent elements.
In practice, the materials used, as well as the contingent shapes and sizes, can be of any type according to requirements without departing from the protective scope of the following claims.

Claims

1. Burner for industrial furnace, which can be installed in a furnace (2) comprising at least one firing chamber (3), said burner comprising:
a main tubular body (6) provided with at least one first port (7) for the inlet of a fuel, with at least one second port (8) for the inlet of combustive agent, and with an end nozzle (15) provided with an outlet mouth (16), during use, facing towards said firing chamber (3), and
means (12) for triggering the combustion of the fuel - combustive agent mixture, at least one duct (17) adapted, during use, to pick up a portion of the gases present within the firing chamber (3) and to convey them at said outlet mouth (16), said burner being characterised in that it comprises at least one at least a tubular element (18) downstream said outlet mouth (16) of said end nozzle (15) within said at least one duct (17), said end nozzle (15) and said at least one tubular element (18) delimiting therebetween a passage section for the fluid communication between said at least one duct (17) and said outlet mouth (16), for the passage of said gas portion, said end nozzle (15) and said at least one tubular element (18) being mutually movable along said duct (17) in order to vary the width of said passage section.
2. Burner according to claim 1 , wherein said end nozzle (15), during use, is arranged with said outlet mouth (16) at a first predetermined distance (Dl ) from the firing chamber (3).
3. Burner according to claim 1 or 2, comprising at least a gap defined between said duct (17) and said at least one tubular element (18).
4. Burner according to any one of the previous claims, wherein said tubular element (18) comprises a first opening (18a) communicating with said outlet mouth (16) of said nozzle (15).
5. Burner according to claim 4, wherein a first opening (18a) is arranged at a second predetermined distance (D2) from said outlet mouth (16), when said tubular element (18) and said end nozzle (15) are arranged in a first operative position.
6. Burner according to claim 4 or 5, wherein said first opening (18a) of said at least one tubular element (18) is sized in a manner so as to allow the at least partial insertion of said end nozzle (15) at its interior.
7. Burner according to any one of the previous claims, wherein said tubular element (18) has a cylindrical conformation, with constant cross section along its length.
8. Burner according to any one of the previous claims, wherein said end nozzle (15), at said outlet mouth (16), is shaped substantially frustoconical or convergent.
9. Burner according to any one of the previous claims, wherein said end nozzle (15) is movable with respect to said at least on tubular element (18) at least between said first operative position and a further operative position of obstruction of said passage section, thus preventing the fluid communication between said duct (17) and said outlet mouth (16).
10. Burner according to claim 1 , wherein said main tubular body (6) and said tubular element (18) are substantially arranged coaxially to each other inside said duct (17).
1 1. Burner according to any one of the previous claims, wherein said duct (17) comprises at least one sleeve (19) inside which said at least one tubular element (18) and said main body (6) are arranged substantially coaxially.
12. Burner according to claim 3, wherein said tubular element (18) comprises supporting means (20) adapted to support said at least one tubular element (18) inside of said duct (17), so as to define said gap (17).
13. Burner according to the previous claim, wherein said supporting means (20) comprise at least two lower bases of said tubular element (18), adapted to rest on the inner surface of said duct (17).
14. Burner according to claim 12, wherein said supporting means (20) comprise at least one baffle (20') for the connection between said at least one tubular element (18) and said duct (17).
15. Burner according to any one of the previous claims, comprising means (21) for adjusting the mutual distance between said outlet mouth (16) of said end nozzle (15) and said first opening (18a) of said at least one tubular element (18).
16. Burner according to the previous claim, wherein said adjustment means (21) are of the mechanical type with manual actuation.
17. Burner according to claim 15, wherein said adjustment means (21) are of automated type.
18. Burner according to claim 15, wherein said adjustment means (21) comprise at least one at least a spacer (22) interposable between a collar (14) of said main tubular body (6) and abutment means (23) associable with one end of said duct (17) through which the main body (6) is introduced.
19. Burner according to the previous claim, wherein said abutment means (23) are made of a heat insulating material.
20. Burner according to claim 18 or 19, wherein said abutment means (23) comprise means for cooling said main tubular body (6), in the area in the proximity of said end nozzle (15).
21. Industrial furnace, comprising at least a firing chamber (3) delimited by at least one wall (4) having at least a through channel (5), characterized in that it comprises at least a burner (1 ) according to any one of claims from 1 to 20, inserted into said through channel (5).
22. Industrial furnace according to claim 21 , wherein said at least tubular element (18) comprises a second opening (18b) afferent to said cooking chamber (3).
23. Industrial furnace according to claim 21 or 22, wherein said duct (17) is arranged substantially coaxially inside said through channel (5).
24. Industrial furnace according to any one of claims 21 to 23, wherein said abutment means (23) are associated to the outer surface (4a) of said wall (4) of said industrial furnace.
25. Industrial furnace according to the previous claim, wherein said abutment means (23) comprise an annular support fastened to said at said outer surface (4a) at said through channel (5), said annular support comprising an axial cavity (24) housing at least partially said main tubular body (6).
EP15726700.6A 2014-06-12 2015-04-17 Industrial furnace provided with a burner Active EP3155320B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVR20140165 2014-06-12
PCT/IB2015/052827 WO2015189717A1 (en) 2014-06-12 2015-04-17 Burner for industrial furnace, as well as industrial furnace provided with such burner

Publications (2)

Publication Number Publication Date
EP3155320A1 true EP3155320A1 (en) 2017-04-19
EP3155320B1 EP3155320B1 (en) 2018-07-04

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EP (1) EP3155320B1 (en)
CN (1) CN106716014A (en)
ES (1) ES2686522T3 (en)
WO (1) WO2015189717A1 (en)

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IT201900003481A1 (en) * 2019-03-11 2020-09-11 Sacmi Forni Spa APPARATUS AND BURNER FOR COOKING CERAMIC PRODUCTS
WO2021229468A1 (en) * 2020-05-12 2021-11-18 Sacmi Forni & Filter S.p.A. Apparatus, burner and method for the firing of ceramic articles
RU2775169C1 (en) * 2019-03-11 2022-06-28 Сакми Форни Е Филтер С.П.А. Burner for firing ceramic products and device for firing ceramic products

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WO2024033852A1 (en) * 2022-08-10 2024-02-15 Siti - B&T Group S.P.A. Burner for industrial kilns

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Publication number Priority date Publication date Assignee Title
IT201900003481A1 (en) * 2019-03-11 2020-09-11 Sacmi Forni Spa APPARATUS AND BURNER FOR COOKING CERAMIC PRODUCTS
WO2020183390A1 (en) * 2019-03-11 2020-09-17 Sacmi Forni S.P.A. Apparatus and burner for the firing of ceramic articles
CN113748303A (en) * 2019-03-11 2021-12-03 萨克米窑炉和过滤器股份有限公司 Apparatus and burner for firing ceramic articles
RU2775169C1 (en) * 2019-03-11 2022-06-28 Сакми Форни Е Филтер С.П.А. Burner for firing ceramic products and device for firing ceramic products
CN113748303B (en) * 2019-03-11 2023-06-09 萨克米窑炉和过滤器股份有限公司 Device and burner for firing ceramic products
WO2021229468A1 (en) * 2020-05-12 2021-11-18 Sacmi Forni & Filter S.p.A. Apparatus, burner and method for the firing of ceramic articles

Also Published As

Publication number Publication date
EP3155320B1 (en) 2018-07-04
WO2015189717A1 (en) 2015-12-17
ES2686522T3 (en) 2018-10-18
CN106716014A (en) 2017-05-24

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