WO2015181762A1

WO2015181762A1 - Burner device for furnaces as well as furnace provided with such device

Info

Publication number: WO2015181762A1
Application number: PCT/IB2015/054004
Authority: WO
Inventors: Pierangelo BARCELLINO
Original assignee: Siti - B&T Group S.P.A.
Priority date: 2014-05-28
Filing date: 2015-05-28
Publication date: 2015-12-03

Abstract

The present invention regards a burner device for furnaces comprising a main tubular body (2) having an outer end (2a) and an inner end (2b), an opening (6) for introducing a comburent fluid and a conduit (7) for transferring or transporting fuel fluid.

Description

"BURNER DEVICE FOR FURNACES AS WELL AS FURNACE PROVIDED

WITH SUCH DEVICE"

5 Designated inventor: Pierangelo Barcellino

TECHNICAL FIELD OF THE INVENTION

The present invention regards a burner device for furnaces, in particular for industrial furnaces, e.g. for firing sanitary ware and the like, as well as a furnace provided with one or more of such burners.

l o STATE OF THE PRIOR ART

In the field of production of industrial furnaces, particularly for firing sanitary ware and the like, specific types of burners are used which comprise a main tubular body defining an inner volume and having, at one end, a supply opening that faces towards the firing chamber of the furnace.

15 Along the main tubular body, an opening is provided in the inner volume thereof for the insertion of comburent fluid in conditions suitable for producing the combustion reaction, i.e. preferably ambient air or air preheated to a specific temperature.

In addition, within the inner volume defined by the main tubular body, a transport 20 conduit is provided that is suitable for carrying the fuel, e.g. methane, substantially at the supply opening of the main tubular body.

Such conduit can for example be arranged coaxial or substantially coaxial with the main tubular body of the burner, but it could also have a different positioning.

In normal operating conditions, the latter solution allows conveying the fuel, in a 25 suitable quantity, to a zone of the furnace - i.e. the entrance of the main tubular body inside the firing chamber - in which air at very high temperature is present: this allows increasing the combustion yields, and hence minimizing fuel consumptions.

This solution, which is quite advantageous with regard to combustion efficiency, 30 is not as advantageous with regard to the safety conditions and to the reliability of furnace operation.

Indeed, the injection of fuel directly inside the firing chamber does not provide sufficient assurance as to whether said fuel is actually burned, and regarding the quantity burned.

Naturally, due to this, the firing conditions of the products cannot be controlled with sufficient accuracy.

In addition - even more serious - zones of the furnace can be created where unburnt fuel is accumulated, with consequent risks of explosion given the high temperatures present.

WO0118449A1, JPS58158412 and CA1169753A1 teach respective solutions according to the state of the art.

OBJECTS OF THE INVENTION

The technical task of the present invention is to improve the state of the art.

In the scope of such technical task, one object of the present invention is to provide a new burner device that ensures a reliable and safe operation.

Another object of the present invention is to provide a new burner device that allows obtaining an improved control of the firing conditions of the products contained inside the furnace.

Yet another object of the present invention is to provide a new furnace, in particular an industrial furnace, e.g. for firing sanitary ware and the like.

In accordance with one aspect of the invention, a burner device is provided according to claim 1.

In accordance with another aspect of the invention, a furnace is provided according to claim 12.

The dependent claims refer to preferred and advantageous embodiments of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

Other characteristics and advantages of the invention will be more evident from the description of embodiments of a burner device, illustrated as an example in the enclosed drawings, in which: figure 1 is a view in longitudinal section of a burner device according to the present invention, inserted in a wall of a furnace;

figure 1 A is an enlarged scale view of a detail of figure 1.

EMBODIMENTS OF THE INVENTION

With reference first to Figures 1 and la, a burner device 1 for furnaces is illustrated according to the present invention.

The burner device 1 comprises a main tubular body 2, which is extended around a longitudinal axis X-X and has one or more ends (one according to the illustrated example) 2a, outer during use, and one or more ends (one according to the illustrated example) 2b, inner during use, and open, or better yet delimiting, a distribution opening la for the supply, in a furnace OV, more particularly in a firing chamber CC thereof, of a flame generated by the burner device following the combustion between the fuel fluid and the comburent fluid.

The inner end 2b can, if desired, project or be extended within the firing chamber CC of a furnace OV or be entirely housed within the walls OV1 of the furnace.

The burner device 1 then comprises one or more conveying conduits 3 for conveying a fuel fluid, such as a gas, e.g. methane, coal gas, oil gas or hydrogen, which is arranged in the flow zone delimited by the main tubular body 2, preferably coaxial therewith, in a manner such that between the main tubular body 2 and the conveying conduit 3 one or more inner volume(s) 4 remains/remain delimited, preferably a substantially annular inner volume with passage section if desired variable from one side of the burner device to the other.

The inner volume 4 actually constitutes a space or sector for the channeling or passage of the comburent and fuel fluids, which is extended without fluid interruptions from the inlet openings of the comburent and fuel fluids up to the firing chamber CC, and in which the latter fluids are mixed so as to give rise to part of the combustion and generation of the flame to be introduced into the firing chamber CC of the furnace OV.

The conveying conduit 3 is provided with one or more inlet openings 3 a for the fuel fluid, as well as with one or more supply openings 3 b for the fuel fluid into the inner volume 4.

The burner device 1 then comprises one or more introduction openings 6 for introducing a comburent fluid, e.g. air, placed at the outer end 2a and, preferably, at a distance from the inner end 2b that is greater with respect to the first supply opening 3b.

The introduction opening(s) 6 is/are in fluid communication with the inner volume 4, so as to allow the supply, into the latter, of the comburent fluid, which will then be mixed with the fuel fluid for the generation of the flame of the burner to be introduced through the distribution opening la into the firing chamber CC of the furnace. Preferably, the introduction opening(s) 6 is/are through opening(s) delimited by the main tubular body 2, and can be placed in fluid communication with a suitable source of comburent fluid or actually constitute an opening towards the outside or with the external environment for the inner volume 4.

The burner device 1 according to the invention comprises one or more transport or transfer conduits 7 for transporting or transferring part of the fuel fluid.

In particular, as will be clearer hereinbelow, the transport or transfer conduit 7 has the function of drawing part of the fuel coming through the conveying conduit 3 in order to directly transfer it to the distribution opening la of the burner device 1, attaining the technical effects that will be better described hereinbelow.

The conduit 7 is supplied with fuel fluid at a supply opening thereof, and then has one or more discharge openings 8a in the inner volume 4.

Alternatively, the transport conduit 7 can be extended to the distribution opening la or slightly beyond the same, so as to supply fuel fluid directly into the distribution opening la or outside the burner device, and then, once the burner has been correctly installed, within the firing chamber CC, attaining the technical advantages that will be better clarified hereinbelow.

The discharge opening(s) 8a of the transport conduit(s) 7 is/are also spaced or at a distance from the supply opening 3 b and from the introduction opening 6, with reference to the direction of the longitudinal axis of the tubular body 2, such that it/they (discharge opening(s)) is/are closer to the inner end 2b of the supply opening(s) 3 b and of the introduction opening 6.

In substance, the discharge opening(s) 8a constitutes/constitute a second inlet opening, for the fuel fluid that traverses the transport conduit 7, directly into the firing chamber CC, that is spaced with regard to the first inlet opening and hence with respect to the supply opening 3b.

As stated, advantageously, the transport conduit 7 is in fluid communication with the conveying conduit 3; hence the conduit 7 is adapted to draw or collect a part of the fuel fluid coming from the conveying conduit 3, and to discharge it in the firing chamber CC through the discharge opening(s) 8a, or also partially in the inner volume 4.

The non-drawn part of the fuel fluid is supplied into the inner volume 4 by means of the supply opening(s) 3b: therefore, the transport conduit 7 actually constitutes an extension of the conveying conduit 3.

Preferably, the conveying conduit 3 and the transport conduit 7 each delimit a respective flow zone for the fuel fluid in fluid communication with each other, with the conveying conduit 3 having greater section than the transport conduit 7; in addition, the conveying conduit 3 is extended, and is intended to convey the fuel fluid, between the inlet opening 3a and the supply opening 3b as well as to discharge a part thereof at the supply opening 3b in the inner volume 4, while the transport conduit 7 is extended, and is intended to convey the remaining part of the fuel fluid (that not discharged through the supply opening 3b), between the conveying conduit 3 and the discharge opening(s) 8a.

According to one aspect of the present invention, the burner device 1 comprises at least one pilot burner stage, indicated overall with P.

In particular - and as will be better clarified hereinbelow - the pilot burner stage P has the function of generating a flame in the inner volume 4, suitable for being propagated at least up to the distribution opening la.

The pilot stage P is provided at the first supply opening 3b of the conveying conduit 3.

The pilot stage P comprises suitable means for triggering the reaction 13 between the fuel fluid and the comburent fluid.

In addition, the pilot stage P comprises means for detecting the flame 14 generated by the reaction between the fuel fluid and the comburent fluid, such as electrodes or the like.

5 The reaction triggering means 13 and/or flame detection means 14 of the pilot stage P are provided at the supply opening 3b.

If desired, the conveying conduit 3 can also be made of a single piece or integral with the transport conduit 7.

The supply opening or openings 3b is/are directed or open towards the distribution i o opening la and hence towards the firing chamber CC of the furnace OV, such that the fuel fluid introduced into the inner volume 4 through the introduction opening or openings 3b has concordant flow or is pushed in the same direction as the comburent fluid in the inner volume 4 itself, i.e. towards the distribution opening la.

15 Such expedient ensures that the pilot stage or better yet the flame hits the main stage that breaks out at the discharge opening 8a and ensures that the latter remains lit and is not extinguished due to the turbulence in the firing chamber CC in the furnace.

Moreover, the supply opening(s) 3b is/are upstream (with reference to the travel 20 direction of the burner from the outside towards the distribution opening la) of the reaction triggering means 13, i.e. the supply opening 3b is situated at a distance from the outer end 2a that is equal to or less than the distance between the outer end 2a and the reaction triggering means 13.

The pilot stage P also comprises means 15 for increasing the turbulence, extended 25 in the inner volume 4, which are intended to improve the mixing of the fuel fluid and comburent fluid in the inner volume 4.

The triggering means 13 and the flame detection means 14 are associated with respective connectors 13a, 14a provided in the outer end 2a of the main tubular body 2.

30 More particularly, the pilot stage P is arranged at a distance from the firing chamber CC of the furnace, such that the pilot flame generated by this is little affected by possible variations of the flow that can occur in the firing chamber CC of the furnace, in a manner though such to ensure that the pilot flame is capable of reaching the main stage, so as to maintain the flame of the latter lit.

For such purpose, the supply opening(s) 3b and hence the pilot stage P generated by these can be situated at a distance from the distribution opening la between about 1/3 and about 1/2 of the distance between the outer end 2a and the inner end 2b of the main tubular body 2.

Preferably, the conveying conduit 3 comprises a first end 3 c delimiting the inlet opening 3a, and a second end 3d proximal to the supply opening 3b as well as internal and in any case closer to the inner end 2b, and more distant from the outer end 2a with respect to the first end 3 c.

Regarding the transport conduit 7, this can comprise a first end 7a proximal to the supply opening 3b and delimiting the supply opening of the conduit 7, as well as a second end 7b proximal to the inner end 2b and in any case further away from the outer end 2a, and closer to the inner end 2b with respect to the first end 7a.

If desired, the second end 7b can be provided at the inner end 2b, or slightly projecting with respect to the latter outside the burner device 1 and thus, when this is correctly installed, within the firing chamber CC.

Preferably, the second end 3d of the conveying conduit 3 at least partially winds the first end 7a of the transport conduit 7. In such case, the supply opening(s) 3 b is/are delimited between the second end 3d of the conveying conduit 3 and the first end 7a of the transport conduit 7. According to such variant, the supply opening 3b could be a substantially annular opening, delimited between the first tubular end 7a and the second tubular end 3d, or more preferably a plurality of holes arranged along the annular zone between such ends 3d and 7a.

Still more preferably, the conveying conduit 3 and the transport conduit 7 comprise respective tubular elements extended around a same main extension axis corresponding with or parallel to the longitudinal axis X-X of the main tubular body 2. Alternatively, the transport conduit 7 could draw or obtain fuel fluid from a source different from the conveying conduit 3.

The transport conduit 7 advantageously delimits a longitudinal channel 7c with an end part proximal to the inner end 2b of the main tubular body 2 and leading into the same, having in the direction of approaching the inner end 2b, a portion with decreasing diameter or section 7d and then a portion with increasing diameter or section 7f.

If desired, between the portion with decreasing diameter or section 7d and the portion with increasing diameter or section 7f, the end part of the longitudinal channel 7c comprises a portion with substantially constant diameter or section 7e. In substance, such end part of the longitudinal channel can be configured like the passage channel of a Venturi tube.

The transport conduit 7 also comprises a sleeve component 9, fit on its second end 7b, and delimiting the end part of the longitudinal channel 7c.

Still more preferably, the sleeve component 9 delimits a main channel section constituting the end part of the longitudinal channel 7c and substantially aligned with the latter and terminating at, or leading into, a discharge opening 8a.

In addition, the sleeve component 9 delimits one or more transverse channel sections 10, preferably orthogonal with respect to the main channel section and each extended between the inner volume 4 and the longitudinal channel 7c, preferably between the inner volume 4 and the main channel section.

In such case, both the main channel section and the transverse channel section(s) 10 are in fluid communication with the inner volume 4, preferably, one (main channel section) through one or more respective discharge openings 8a and the other (transverse channel section 10) through a respective suction opening 8b.

The transverse channel sections 10 preferably have diameter or section much smaller than the main channel section.

Preferably, one or more transverse channel sections 10 extends/extend between the constant diameter portion 7e and the inner volume 4. Alternatively, in particular if the constant diameter portion 7e is not provided, the transverse channel section(s) 10 is/are extended between a passage zone from the decreasing portion 7d to the increasing portion 7f of the end part of the longitudinal channel 7c and the inner volume 4.

Due to such specific structure of the end part of the longitudinal channel, the suction through the suction opening(s) 8b of the fluids is caused from the inner volume 4 to the longitudinal channel 7c.

With reference now in particular to the main tubular body 2, this preferably delimits a flow zone with section decreasing in the direction approaching the inner end 2b and, still more preferably, the discharge opening(s) 8a leads/lead into the flow zone with decreasing section or directly into the firing chamber CC.

If one or more suction openings 8b are provided, the latter are preferably provided at the flow zone with decreasing section, so as to suck fluid(s) from the latter. More particularly, the main tubular body 2 can comprise, from the outer end 2a to the inner end 2b, a first tubular segment 2c, during use external with respect to a respective furnace OV or to a respective wall OV1 of a furnace OV, as well as a second segment or nozzle 2d, during use extended inside a respective cavity OV2 of the furnace OV or of the wall OV1 and fixed with fluid seal to the first segment 2c.

The nozzle 2d preferably delimits a flow zone with decreasing section.

The second segment or nozzle 2d can for example comprise a first section 2dl tapered in the direction approaching the inner end 2b, e.g. frustoconical, then a second section 2d2 with greater tapering than the first section 2dl, i.e. with section decreasing with greater slope or tilt than the first section 2dl. The second segment or nozzle 2d can also terminate with a substantially cylindrical section 2d3 extended from the second section 2d2.

In such case, the discharge opening(s) preferably leads/lead into the flow zone delimited by the second section 2d2 or, still more preferably, between the second 2d2 and the third section 2d3. Alternatively, as stated above, the discharge opening(s) directly leads/lead into firing chamber CC.

For the fixing of the first 2c and second 2d tubular segment, these can be suitably flanged, or, according to the specific embodiment illustrated in the figures, the first segment 2c can have a flanged end 2c 1 fixed - e.g. bolted by means of bolts 11 - to an annular plate 2e as well as to the furnace OV or better yet to a wall OVl of the furnace OV, more particularly to an external surface of the furnace OV or of the wall OVl. One end of the second segment 2d can then be tightened between a section 2el, if desired projecting towards the axis X-X of the annular plate 2e, and the first segment 2c, or between the section 2el and the gaskets 12, if desired annular, placed between the first segment 2c and the second segment 2d. The main tubular body 2 can then also comprise a third segment 2f that is fixed, e.g. bolted, to the top of the first segment 2c, and whose free end constitutes the outer end 2a.

Preferably, the main tubular body 2 is made of a fluid seal material, e.g. aluminum, such that leaks therefrom or better yet from the flow zone delimited thereby do not occur, hence leaks from the inner volume 4 do not occur of comburent fluid or fuel fluid except at suitable openings, in particular at the inner end 2b or better yet at the distribution opening la.

Moreover, the main tubular body 2 is made of a material and has a structure such to prevent entrances of fluids such as air or another fluid therein, or better yet into the inner volume 4, in zones other than the suitable openings, such as the introduction opening 6, the supply opening(s) 3b and the discharge opening(s) 8a. With regard to the conveying conduit 3, this can comprise one or more sections, preferably tubular, fixed or welded together and preferably substantially aligned or with trim substantially parallel to the longitudinal axis X-X of the main tubular body 2. A portion of the conveying conduit 3 could project externally beyond the main tubular body 2.

Preferably, the conveying conduit 3 is made of a material with fluid seal, e.g. stainless steel, such that leaks therefrom or better yet of fluid fuel do not occur, except at suitable openings, in particular at the supply opening 3b. Moreover, the conveying conduit 3 is made in a manner such to prevent entrances of fluids, such as air or fuel fluid or another fluid therein, in zones other than the suitable openings, such as the inlet opening 3 a.

If the conveying conduit 3 is obtained by means of multiple parts or segments, each of these will be preferably made with fluid seal as stated above and additionally these will be connected with each other so as to ensure the sealing 5 therebetween, if desired by interposing suitable gaskets therebetween in order to prevent undesired leaks or escapes of fuel fluid therefrom (from the conveying conduit) as well as undesired entrances or introductions of fluid therein (into the conveying conduit).

According to the embodiment illustrated in Figure 1, the transport conduit 7 is i o made of a material with fluid seal, e.g. steel or silicon carbide, such that leaks therefrom or better yet of fuel fluid do not occur except at suitable openings, in particular at the discharge opening(s) 8a.

Moreover, the transport conduit 7 is made in a manner such to prevent entrances of fluids, such as air or fuel fluid or another fluid therein, in zones other than the

15 suitable openings, by suitable openings it being intended the first end 7a intended to allow the introduction of the fuel fluid in the longitudinal channel 7c or (if provided) the suction openings 8b which allow the entrance into the longitudinal channel 7c of the fluids (preferably comburent fluid) present in the zone of the inner volume 4 around the transport conduit.

20 The burner device 1 can then be provided with means for pumping or pressurizing the fuel fluid and/or comburent fluid in the various conduits and components of the burner device.

Also forming an object of the present invention is a furnace OV comprising at least one firing chamber CC, delimited by one or more walls OV1, and then 25 comprising one or more burner devices 1 having the above-described characteristics.

The at least one burner device 1 provided in the furnace OV is installed in the aforesaid wall OV1 or in another wall of the furnace; the inner end 2b of the burner device 1 leads - or is directed - towards the firing chamber CC, so as to 30 supply therein the flame generated by the combustion reaction in the inner volume 4 between the fuel fluid and the comburent fluid, as well as especially the fuel fluid that has not yet reacted and preferably issued by the discharge opening 8a. As will be understood, a burner device according to the present invention is very efficient, due to the presence of a transport or transfer conduit 7, since there are multiple points of areas of reaction between the fuel and comburent and, more particularly, both at the supply opening(s) 3b and at the discharge opening(s) 8a of the transport conduit 7 or directly in the firing chamber CC, if part of the fuel fluid (in particular that issued from the discharge opening 8a) is introduced non-reacted into the firing chamber CC.

With particular reference to the zone at the latter (discharge opening(s) 8a), the fuel fluid reacts with a comburent fluid in the firing chamber CC and/or with preheated comburent fluid in the inner volume 4 in the section between the introduction opening 6 and the discharge opening 8a and more particularly in the section of the inner volume 4 between the supply opening 3b and the discharge opening 8a.

For such purpose, indeed, in a burner device according to the present invention, in the section of the inner volume between the supply opening 3b and the discharge opening 8a, fuel fluid and comburent fluid are present, as well as, if desired, reaction triggering means 13 for the reaction between such fluids, so that a pilot flame is developed that ensures the presence of the flame and moreover heats part of the comburent fluid that has not yet reacted.

Since the fuel fluid and the comburent fluid, in particular air, react better and with greater effectiveness when heated, it will be understood that due to a burner device according to the present invention, it is possible to obtain an reaction efficiency improved with respect to that of burners in accordance with the state of the art, since part (preferably most) of the fuel fluid reacts with hot comburent fluid in the firing chamber CC and/or with comburent fluid preheated by the flame generated by the pilot stage P in the inner volume 4 of the burner device.

If then the burner device also comprises an end part of the longitudinal channel 7c configured as stated above, i.e. like the passage channel of a Venturi tube, as well as transverse channel sections 10, then the fuel fluid that flows in the transport conduit 7 also reacts with the comburent fluid sucked into the longitudinal channel 7c through the suction openings 8b.

The structure of the burner device according to the present invention also involves greater safety and assurance that a flame is generated, and also that all the fuel fluid suitably reacts and hence there is no or little non-reacted fuel fluid dispersed in the firing chamber CC.

For such purpose, as will be understood, if a pilot burner stage P is not provided, the fuel fluid that is introduced non-reacted in the firing chamber CC of the furnace OV might not react or might not immediately react, which would determine a condition of potential danger, also (among other things) for the obtainment of a correct firing of the products in the furnace, since the unburnt fuel fluid could react in an uncontrolled manner in the firing chamber, ruining the firing of the products.

The flame generated by the pilot burner stage P instead makes it possible or ensures the correct reaction of all the fuel fluid in the burner as soon as it is inserted in the firing chamber CC, or in any case within pre-established correct firing times.

A burner device according to the present invention allows obtaining the aforesaid advantages and attaining an efficiency of combustion reaction between the fuel fluid and the comburent fluid that is greater than that of the known burner devices, in any case having a much simpler structure than the latter.

Modifications and variants of the invention are possible within the protective scope defined by the claims.

Claims

1. Burner device for furnaces comprising:

a main tubular body (2) extending about a longitudinal axis (X-X) and having at least one outer end (2a), in use, and at least one inner, in use, and open end (2b), and delimiting at least one distribution opening (la) for the supply, in a furnace (OV), of a flame generated by said burner device, said main tubular body (2) delimiting at least one inner volume (4);

at least one opening for introducing (6) a comburent fluid placed at said outer end (2a), said at least one opening for introducing (6) being in fluid communication with said at least one inner volume (4) so as to allow supplying said comburent fluid in the latter;

at least one conduit (7) for transferring or transporting the fuel fluid provided with at least one discharge opening (8a) substantially terminating at said distribution opening (la),

characterized in that it comprises at least one pilot burner stage (P), provided in said inner volume (4) in an intermediate position comprised between said outer end (2a) and said inner end (2b), adapted to generate a flame propagating towards said distribution opening (la).

2. Burner device according to claim 1, wherein said pilot burner stage (P) comprises means (13) for triggering the combustion reaction and means for detecting the flame (14) within said inner volume (4).

3. Burner device according to claim 1 or 2, wherein said pilot burner stage (P) comprises at least one conduit for conveying (3) a fuel fluid arranged in said main tubular body (2), said at least one conduit for conveying (3) being provided with at least one opening (3a) for the inlet of fuel fluid and at least one opening (3b) for supplying the fuel fluid in said at least one inner volume (4), in an intermediate position comprised between said outer end (2a) and said inner end (2b).

4. Burner device according to the preceding claim, wherein said at least one conduit for transferring or transporting (7) is in fluid communication with said conduit for conveying (3) and is intended to draw or collect a part of said fuel fluid and substantially discharge it at said distribution opening (la), while the non-drawn part of said fuel fluid is supplied in said inner volume (4) through said at least one opening (3b) for supplying said conveying conduit (3).

5. Burner device according to the claim 3 or 4, wherein said conveying conduit (3) and said transport conduit (7) each delimit a respective zone of flow of said fuel fluid in fluid communication with respect to each other, said conveying conduit (3) having a section larger than said transport conduit (7), and in that said conveying conduit (3) extends and it is designed to convey said fuel fluid between said inlet opening (3a) and said at least one supply opening (3b), while said transport conduit (7) extends and it is intended to convey the remaining part of said fuel fluid between said conveying conduit (3) and said at least one discharge opening (8a).

6. Burner device according to the claim 3, 4 or 5, characterized in that said conveying conduit (3) comprises a first end (3c) delimiting said inlet opening (3a) and a second end (3d) proximal to said at least one supply opening (3b), while said transport conduit (7) comprises a first end (7a) proximal to said supply opening (3 b) and delimiting the opening for supplying of said transport conduit (7), as well as a second end (7b) proximal to said inner end (2b), said second end (3d) of said conveying conduit (3) at least partly winding said first end (7a) of said transport conduit (7), so that said at least one supply opening (3b) is delimited between said second end (3d) of said conveying conduit (3) and said first end (7a) of said transport conduit (7).

7. Device according to the claim 3, 4, 5 or 6, characterized in that said conveying conduit (3) and said transport conduit (7) comprise tubular elements extending about the same main extension axis corresponding or parallel to said longitudinal axis (X-X) of said main tubular body (2).

8. Burner device according to any one of the preceding claims, characterized in that said at least one transport conduit (7) delimits a longitudinal channel (7c) with an end part or proximal to said inner end (2b) of said main tubular body (2) and terminating at the same, having in the direction of approaching said inner end (2), a portion with a decreasing diameter or section (7d) and thus a portion with an increasing diameter or section (7f), possibly with a portion with a substantially constant diameter or section (7e) between said portion with decreasing diameter or section (7d) and said portion with increasing diameter or section (7f).

9. Burner device according to the previous claim, wherein said transport conduit (7) comprises at least one sleeve component (9) fitted on a second end (7b) of said transport conduit (7) and delimiting the end part of said longitudinal channel (7c), said sleeve component (9) also delimiting at least one section of transverse channel (10) extending between said inner volume (4) and said longitudinal channel (7c), said sleeve component (9) being in fluid communication with said inner volume (4) through a respective suction opening (8b), thereby determining the suction through said suction opening (8b) of the fluids from said inner volume (4) to said longitudinal channel (7c).

10. Burner device according to the preceding claim, wherein said at least one transverse channel section (10) extends between said portion with substantially constant diameter or section (7e) and said inner volume (4).

11. Burner device according to any one of the preceding claims, wherein said tubular main body (2) delimits a flow zone with section decreasing in the direction of approaching to said inner end (2b), and wherein said at least one discharge opening (8a) terminates in said flow zone with decreasing section of said main tubular body (2).

12. Burner device according to any one of the preceding claims when depending upon claim 3, wherein said at least one supply opening (3b) is directed or opens towards said distribution opening (la).

13. Burner device according to claim 12, wherein the fuel fluid introduced into said inner volume (4) through said at least one supply opening (3b) has concordant flow or is pushed in the same direction as said comburent fluid introduced in said inner volume (4) through said at least one opening (6) for introducing.

14. Burner device according to any one of the preceding claims when depending upon claim 3, wherein said at least one discharge opening (8a) is at a distance from said inner end (2b) lower than the distance between said at least one supply opening (3b) and said inner end (2b).

15. Burner device according to any one of the preceding claims when depending upon claims 2 and 3, wherein said at least one supply opening (3b) is at or upstream of said reaction triggering means (13), i.e. said at least one supply opening (3 b) is situated at a distance from said outer end (2a) that is equal to or less than the distance between said outer end (2a) and said reaction triggering means (13).

16. Burner device according to any one of the preceding claims when depending upon claim 3, wherein said at least one supply opening (3b) is at a distance from said distribution opening (la) between about 1/3 and about 1/2 of the distance between outer end (2a) and inner end (2b) of said main tubular body (2).

17. Furnace, comprising at least one firing chamber (CC), characterized in that it comprises at least one burner device (1) according to any one of the preceding claims installed in at least one wall (OV1) of said furnace and whose inner end (2b) terminates or faces towards said firing chamber (CC).