SK8731Y1 - Burner for combustion of gaseous fuel in a shaft furnace, especially for heat treatment of minerals in granular form - Google Patents

Abstract

The burner is located in the burner chamber (1) in the shaft furnace shell and has a supply line (2) connected to the gaseous fuel source. The burner includes a separator pad. The burner nozzle (3) is located inside the separator insert (4). Second end (9) of the separator insert (4) extends into the peripheral zone by which the burner chamber (1) is fed to the interior of the shaft furnace. The outer dimension of the separator insert (4) is smaller than the inner dimension of the burner chamber (1). Combustion air enters into the separator insert (4) where it is mixed with the gaseous fuel and then burns. The burner nozzle is located outside the peripheral zone, typically it will be more than 100 mm, preferably more than 250 mm from the inner edge of the burner chamber (1).The edge of the burner chamber (1) is protected against overheating and a more homogeneous temperature profile is achieved in the sintering zone of the shaft furnace, thereby minimizing the amount of unwanted adhesives and unburned charge.

Description

Technical field

The technical solution relates to a burner for the combustion of gaseous fuel, for example for the combustion of natural gas, in a shaft furnace, where the charge is heat-treated by the direct action of a flame. The charge, especially in the form of ground mineral, is heated more evenly due to combustion in a new burner, while less dangerous exhalates are formed.

Prior art

In shaft furnaces that are heated by gaseous fuel, a single central burner or a set of burners is used, which are distributed around the circumference of the furnace. The burner is usually mounted on the outside of the furnace shell and the burner opening is provided with a lining which forms a chamber. The mouth of the burner with the nozzle is located inside the chamber, in the peripheral zone, but before the transition to the space of the shaft furnace, so that the burner is not damaged by the movement of material in the furnace. Combustion air is supplied to the chamber and the burner flame burns the edge of the chamber at the entrance to the furnace space, which leads to damage to the masonry.

Moving the burner into the chamber towards the charge partially solves the problems with the thermal stress of the chamber, but leads to imperfect combustion, which is manifested by an increased amount of CO per m ^{3 of} flue gas. At the same time, such an inward displacement of the burner contributes to the uneven melting of the granular charge, in which convection is the dominant mode of heat transfer and this is substantially influenced by the velocity profile of the flame.

These opposing problems are partly solved by the mineral processing burner according to CN204434700, where, in addition to the combustion air, cooling air is supplied, which, however, leads to a structurally complex arrangement. According to this document, the burner protrudes into the furnace space, which is problematic with a horizontally oriented burner in the shaft furnace and would lead to mechanical damage to the burner mouth by the charge. This problem is partially solved by the arrangement according to publication JPH093561, where the burner orifice is inserted inside the chamber, but still represents a complicated construction arrangement which is prone to failures in a rough metallurgical environment. The solution according to the published document EP0660060, which burns coal dust in addition to gas, is also complicated.

EP0302417B1 describes a process for preventing damage to a chamber liner by means of a central burner with a double construction, which, however, requires the preparation of two gas mixtures, the first mixture having a high calorific value, the second mixture having a low calorific value. Such a solution is complicated to provide fuel and is not applicable in existing small diameter chambers

It is desirable and not known to design a burner solution that will burn gaseous fuel with low emissions, especially low CO emissions, evenly overheat the granular charge, and increase the life of the burner, burner chamber, and liner.

The essence of the technical solution

These shortcomings are substantially eliminated by a burner for burning gaseous fuel in a shaft furnace, especially for heat treatment of minerals in granular form, where the burner is located in a burner chamber in the shaft furnace wall and has a supply pipe connected to a gaseous fuel source, the supply pipe terminating in a nozzle. a burner which is located outside the peripheral zone, where the chamber feeds into the interior of the shaft furnace, the forced chamber being supplied with a forced supply of combustion air according to this technical solution, the essence of which consists in comprising an elongate separating insert first end mounted on the supply pipe so that the burner nozzle is located inside the separating insert, at least one combustion air opening is formed between the supply pipe and the separating insert, which connects the air supply with the inner space of the separating insert, the other end separating for tensioning the insert extends into the edge zone and the external dimension of the separator is smaller than the internal dimensions of the chamber.

The terms 'first' and 'second' in this document are intended to distinguish two opposite sides of a body, are not expressive of meaning and are interchangeable. The term first is assigned to the side which is first in the direction of flow of the combustion air and also in the direction of flow of the gaseous fuel.

The term separating insert refers to any body, tube, corona, cylinder, housing that has a continuous outer shell capable of separating the branches of the air flow, respectively. flue gas in the burner chamber. The term insert itself must be understood broadly and is based on the possibility of additional insertion into existing burner constructions.

The cross-sectional shape of the spacer corresponds to the cross-sectional shape of the burner chamber, usually the cross-section has the shape of a circle with inaccuracies that correspond to a particular type of lining. The separating insert will in most cases have the shape of a cylindrical housing and will usually be made of steel, preferably

S K 8731 Υ1 stainless steel. The outer diameter of the cylindrical separating insert is smaller than the inner diameter of the burner chamber, preferably the outer diameter of the cylindrical separating insert is at least 20 mm smaller than the inner diameter of the burner chamber to create a bold cross-sectional profile for air flow between the outer surface of the separating insert and the inner surface of the burner chamber.

An essential feature of the presented technical solution is the creation of separate flow profiles in the burner chamber during the forced supply of air to the burner chamber. The supply of air is usually a pipe which is connected to the outside of the burner chamber via an elbow or a T-piece. By means of a flange on the knee or on the T-piece, a burner is inserted into the burner chamber, being carried by the original pipe as a beam embedded in the flange. The air blown into the burner chamber is distributed so that part of the air passes through at least one opening between the supply pipe and the separating insert and enters the inner space of the separating insert, where the burner nozzle is located. It is advantageous if the separating insert, the supply line and the burner nozzle are in one axis, respectively. their axes differ only in terms of manufacturing and assembly inaccuracies.

The air introduced into the separating insert is primarily used for mixing with the gaseous fuel exiting the burner nozzle, the mixture of air and gaseous fuel is subsequently combusted so that combustion occurs inside the separating insert and continues inside the shaft furnace, where the flame passes and acts directly in the granular charge. Inside the shaft furnace, the uptake of gaseous fuel is aided by air, which bypasses the separating insert and, until this phase, has only served to cool the surface of the burner chamber. This air branch also cooled the outer surface of the spacer to prevent overheating and mechanical collapse. At the same time, the air flowing and cooling the outer surface of the separator element is preheated before entering the combustion space in the furnace.

The burner nozzle is located outside the edge zone through which the chamber is fed to the interior of the shaft furnace, usually more than 100 mm, preferably more than 300 mm from the edge of the chamber. This will correspond to the length of the separating insert, which extends from the front of the burner nozzle to the edge zone of the chamber, preferably to the very edge of the chamber. In this interior space, the flowing gaseous fuel and the flowing combustion air are first mixed, followed by combustion, but the flame does not act directly on the lining of the chamber within the length of the chamber. This has a significant effect on increasing the durability of the chamber lining.

The forced injection of air into the burner chamber according to this technical solution leads to the bypass of the outer side of the separating insert. Thanks to this, the surface of the burner chamber is efficiently cooled even in the peripheral zone, where a critical thermal load has been created so far. The air flowing around the outer side of the separating insert comes into contact with the burning flame at its end, where it can at the same time support the second stage of combustion of the gaseous fuel. The secondary combustion air is first used for cooling before burning inside the shaft furnace.

An important advantage of the presented technical solution is also the usability of the burner in existing shaft furnaces without the need to modify their construction and without the need to modify the air distribution. Existing air ducts are designed without a separation of combustion air and air to cool the burner chamber surface. In this technical solution, it is sufficient to remove the original burner and mount a new burner with a separating insert on the same flange, where the burner is inserted into the burner chamber so that the nozzle is outside the edge zone and the space in front of the burner nozzle to the edge zone is covered with a separating insert. The separation of the combustion air and the cooling air of the burner chamber surface takes place thanks to the new design of the burner. The cross-sectional geometry of the first end of the separating insert is preferably used to adjust the flow rates of these two flow branches. It will be advantageous if the combustion air opening is formed by a space between the outer surface of the supply pipe and the inner opening of the first end of the separating insert.

In inventing the present technical solution, it has proven advantageous if the first end of the separating insert has a conical shape, which then connects to a cylindrical body extending to the second end of the separating insert. The conical shape reduces the throttling of the flowing air and directs the air flow towards the surface of the burner chamber. At the beginning of the separating insert, connecting elements can be arranged, for example at least three screws, by which the separating insert is fastened to the fuel supply line. The annular space delimited by the outer surface of the supply pipe and the inner opening of the first end of the separating insert forms a combustion air opening into which the screw shanks engage. Such a solution has proved to be simple and sufficiently stable, the shortcuts after release do not prevent the disassembly of the burner and the burner nozzle passes without difficulty through the opening of the first end of the separating insert during disassembly.

An improved effect and a longer service life of the separating insert is achieved by an arrangement in which the separating insert has ribs on its outer surface. The ribs are preferably spaced at regular intervals and are parallel to the longitudinal axis of the spacer. The ribs have a length of at least 20% of the length, preferably at least 40% of the length of the spacer. The ribs not only direct the flow of air, but also increase the mechanical and thermal resistance of the body of the separating insert against excessive deformations that occur as a result of thermal expansion. Uneven temperature field during combustion of spo

S K 8731 j1 only with turbulent gas flow can lead to twisting and deflection of the spacer body, ribbing helps to increase the rigidity of the spacer. In the event of excessive deformation which results in the spacer being pressed against the surface of the chamber, the ribs ensure that the gap between the spacer and the surface of the chamber is maintained. At the same time, the ribs increase the effective heat transfer surface and help center the burner in the chamber during assembly. The outer diameter of the separating insert together with the ribs is smaller, at most equal to the inner diameter of the burner chamber.

The possibilities of setting the combustion properties of the burner consist mainly in the design of the dimensions of the individual parts of the burner. The choice of the inner diameter of the cone over the diameter of the burner chamber and over the diameter of the gas supply line has a significant effect on a given gas and air flow. It is also important to design the size of the cross-section of the intermediate ring, which is located between the shell of the separating insert and the inner surface of the burner chamber. The choice of the height of the ribs is related to the size of the intermediate ring.

The properties and shape of the combustion zone are also affected by the location of the nozzle within the length of the burner chamber. An arrangement has proved to be advantageous in which the nozzle with gas openings is located in an area delimited by a length of from 25% to 80% of the wall thickness of the shaft furnace from the outside inwards, which corresponds to a distance Αγτ ^ of 100 to 500 mm from the inside of the shaft furnace. Thanks to this length (compared to 50 mm in the prior art), the combustion is substantially homogenized before the flue gases come into contact with the charge. Subsequently, the completion of the gas in the charge is enabled by the secondary, cooling air which flows between the separating insert and the inner surface of the combustion chamber.

Appropriate choice of geometry of individual parts of the separating insert leads to a simple construction with high reliability and durability. In order to be able to vary the flow conditions, some element of the separating insert may have a variable geometry, for example the combustion air opening may be provided with a diaphragm with a variable throttle.

In order to expand the control possibilities of the burner, it can have separate air inlets inside the separating insert and air into the gap between the separating insert and the inner surface of the burner chamber. With such an arrangement, the amount of primary combustion air and the amount of cooling combustion air that flows around the separating insert from the outside can be regulated separately. In a preferred embodiment, the burner may be provided with a temperature sensor, for example an infrared temperature sensor, the head of which is located in a cold zone, for example on the outer flange of the burner chamber. Measuring the temperature in the peripheral zone makes it possible to evaluate the combustion process and subsequently the temperature fields can be regulated by changing the amount of secondary air.

Tests of the burner according to this technical solution in the existing shaft furnace with the original air and natural gas distribution showed that the CO emissions decreased from 4,000 mg CO / m ³ to below 2000 mg CO / m ³ . The edge of the chamber showed no signs of overheating and a more homogeneous temperature profile was achieved in the sintering zone of the shaft furnace, thus minimizing the amount of unwanted conglomerates and unburned charge. An important benefit of the presented technical solution is the optimization of several conflicting parameters of heat treatment of the granular charge without interfering with the construction of the existing shaft furnace. In particular, there is a decrease in CO emissions and at the same time a reduction in the thermal wear of the burner chamber.

The structurally simple and operationally reliable separating insert restricts the inflow of combustion air into the nozzle space, creates a self-regulating volume of the combustion zone in the inner space of the separating insert and also directs the air bypass which cools the chamber surface. In addition to the above technical advantages, the advantage of the solution is simple use in existing shaft furnaces without the need for investment-intensive modifications to the construction of the shaft furnace and the relevant distribution.

Overview of figures in the drawings

The technical solution is explained in more detail with the aid of Figures 1 to 5. The illustrated shape of the separating insert, the method of its attachment, as well as the dimensional ratios of individual burner parts are only examples and should not be explained as features limiting the scope of protection.

Figure 1 is a cross-section of the burner chamber of a shaft furnace with an inserted burner. The arrow with the letter A indicates the air supply, the arrow with the letter G indicates the gas supply.

Figure 2 is an axo-metric view of the weldment of the separating insert without a nozzle.

Figure 3 shows a weldment of the separating insert without a nozzle in a side view, subsequently Figure 4 shows a section of the weldment of the separating insert at the location A-A.

Figure 5 shows a burner chamber of a shaft furnace with an inserted burner, where two separate branches of supply air are formed for combustion inside the separating insert and on the air flowing around the outer surface of the separating insert.

S K 8731 Υ1

Examples of embodiments

Example 1

In this example according to Figure 1, a burner is used in a shaft furnace for the heat treatment of magnesite ore ground into a granular form. The shaft furnace has several burner chambers 1 around the circumference with burners inserted into the wall of the shaft furnace. The original design involves the distribution of a forced air supply with piping around the perimeter of the shaft furnace shell. The pipe is located below the level of the burner chambers 1. A branch towards the burner chamber 1 is formed from the air duct below the chamber 1, the branch ends with a T-piece. One branch is a T-piece and opens into the burner chamber 1, the other branch is a T-piece and forms a flange end intended for screwing on the burner flange 10. This arrangement forms the original construction, which is used without modifications to cooperate with the new burner according to this technical solution. This brings the advantage of minimal modifications when installing the burner according to this technical solution.

The burner comprises a supply line 2, which is inserted into a flange 10 intended to be screwed to the flange end T of the piece. The supply pipe 2 is gas-tightly connected to the flange 10 and this connection also bears the weight of the burner than the embedded beam. On the other hand, the supply pipe 2 is terminated by a nozzle 3, which in this example is formed by an end with six holes. The openings in the nozzle 3 are guided evenly into the space at an angle of 45 ° from the horizontal axis. The position of the nozzle 3 in the burner chamber 1 is determined by the length of the supply pipe 2 from the plane of the flange 10, the position of the nozzle 3 in this example being set so that the nozzle 3 is approximately 150 mm from the edge of the burner chamber 1.

The burner has a separating insert 4, which is heat-sealed from a plurality of parts of heat-sealing steel, preferably of steel STN 17255. The welding has an elongated elongate shape. The first cone 8 comprises a short collar 7 which has three screw threaded holes. The inner dimension of the first end 8, i.e. the inner diameter of the collar and the conical part, is larger than the outer diameter of the supply pipe 2 and the gap between them forms the combustion air opening 5. By means of connecting elements, here in the form of three screws, the separating insert 4 is fastened and centered against the supply pipe 2. The conical 7 is followed by a cylindrical part of the separating insert body 4. The cylindrical part continues to the edge zone 1, where it forms the second end 9.

On the outer cylindrical surface of the separating insert 4, evenly spaced ribs 6 of web are welded. In this example, the separating insert 4 has 10 ribs 6 which extend to the other end 9.

In this example, the burner chamber 1 has a diameter of approximately 98 mm. In the original burner design, the lining in the edge zone of the chamber 1 was thermally destroyed at the nozzle position 3 at a distance of 50 mm from the edge of the chamber 1. Using a new burner according to this example from the edge of the burner chamber 1, the path of mixing natural gas with the combustion air has been extended, there has been a substantial reduction in CO emissions and at the same time a more even heat treatment of the batch.

Example 2

In this example according to Figure 3, the supply sleeve 2 is slidably mounted in a sleeve which is welded to the flange 10. The mounting is sealed by a pair of sealing rings. This connection also transfers the stuck burner to the flange 10 and at the same time makes it possible to change the position of the nozzle 3 in the chamber 1, thus making it possible to change the distance of the nozzle 3 from the edge of the chamber 1.

A metal screen is located in the combustion air opening 5, by means of which the effective cross section of the combustion air inlet inside the separating insert 4 can be varied.

Example 3

In this example, the separating insert 4 is composed of three parts, which are subsequently welded into one body. The three parts in this example are named as the shell 11, the cylindrical tube 12 and the cone 7. The middle part consists of a cylindrical tube 12 in the middle of which a cylindrical hub 13 is located. The axis of the cylindrical hub 13 is substantially coincident with the axis of the cylindrical tube 12. they may deviate angularly and dimensionally within normal manufacturing tolerances. The hub 13 is welded to three centering wings 14, which in this example have a trapezoidal shape. The wings 14 are welded to the outer circumference of the hub 13 at an angularly equal spacing and welded to the inner surface of the cylindrical tube 12 at opposite ends. In another example, a different number of wings 14 may be used or another support element may be used to provide a centric nozzle location. 3 inside the cylindrical tube 12.

The cylindrical tube 12 is short in this example, its length approximately corresponding to the length of the hub 13, so that the joints can be welded with conventional welding tools which would not otherwise be inserted into a long cavity with a small diameter After welding the hub 13 to the center of the cylindrical tube 12. The cylindrical shell 11 of the burner 12 is welded to the cylindrical shell 11 of the burner with ribs 6. In this example, the shell 11 has the same outer diameter as the cylindrical tube 12. Ribs 6 are longitudinally welded to the shell 11. In this example, the ribs 6 have a cross section of 4x6 mm inserts 4 to approximately half the length of the separating insert 4. The number of ribs 6 in this example is 10 and are evenly angularly spaced around the circumference. On the opposite side, a cone 7 is welded to the quality tube 12 with a discharged hub 13. The cone 7 has an outer diameter identical to the diameter of the cylindrical tube 12 with which the

S K 8731 d1 is welded and towards the opposite end, the cone 7 is tapered to a diameter which is larger than the outer diameter of the gas supply pipe 2, thus forming a cross-section of the intermediate ring through which air is blown to the nozzle 3. This intermediate ring forms the combustion air opening 5.

The outer diameter of the casing 11, including the ribs 6, is in this example approximately 1 mm smaller than the inner diameter of the burner chamber 1, which allows the burner to be easily inserted into the burner chamber 1 and any permanent deformations after heat do not cause burner disassembly problems. The ribs 6 ensure the creation of a gap between the burner and the inner surface of the burner chamber 1, thus protecting the lining at a thermally critical point. The air blown into the burner chamber 1 flows not only through the intermediate ring to the nozzle 3, but is directed by a cone 7 into the space between the casing 11 and the inner surface of the burner chamber 1, thus cooling the wall lining at the burner chamber 1. This air does not enter the combustion process in the burner chamber 1. , but only inside the batch, which enlarges and evenens the combustion zone.

After welding the separating insert 4, the coil is attached to the gas supply pipe 2 in such a way that the threaded end of the supply pipe 2 is inserted into the centered cylindrical hub 13 from the cone side 7 and the nozzle 3 is screwed on the opposite side. the front of the cylindrical hub 13. With this arrangement, an embossed attachment of the burner to the gas supply line 2 is achieved. During assembly, the supply pipe 2 is led in the opening of the flange 10, which closes the burner chamber from the outside.

1. In this example, the nozzle 3 has eight openings through which natural gas flows under pressure into the air stream.

In this example, the nozzle 3 is located approximately 300 mm from the inner edge of the shaft furnace.

Example 4

In this example according to Figure 5, the original air distribution is modified so that two forced air supply branches are formed with separate control valves. The first branch is the air supplied inside the separating insert 4, the second branch of the air is connected to the gap between the separating insert 4 and the inner surface of the burner chamber 1. An infrared thermometer head is placed on the flange 10.

Thanks to the separate regulation of the two air branches, the volume of the cooling secondary air can be varied while maintaining the stoicheometric ratio of the combustion air inside the separating insert 4.

Industrial applicability

Industrial applicability is obvious. According to this technical solution, it is possible to industrially and repeatedly produce a burner for burning gaseous fuel and use it in a shaft furnace, especially in shaft furnaces for heat treatment of minerals in granular form, where the charge is directly exposed to the flame

S K 8731 Υ1

List of reference symbols and abbreviations

- storage room

- supply pipe

3 - nozzle

- separating insert

- combustion air opening

- rib

- cone

8 - first end

- the other end

- flange

bumper skin

- cylindrical tube

13 - charge

Claims (17)

CLAIMS FOR PROTECTION A burner for burning gaseous fuel in a shaft furnace, in particular for heat treatment of minerals in granular form, wherein the burner is located in a burner chamber (1) in the shaft furnace shell and has a supply line (2) connected to a gaseous fuel source, supply line ( 2) is terminated by a nozzle (3) which is located outside the edge zone through which the burner chamber (1) is fed to the interior of the shaft furnace, a forced supply of combustion air being introduced into the burner chamber (1), characterized in that it comprises the separating insert (4), which is fitted with the first end (8) to the supply line (2) so that the burner nozzle (3) is located inside the separating insert (4), the second end (9) of the separating insert (4) extends into the edge zone, between the separating insert (4) and the inner surface of the burner chamber (1) there is a gap for the flow of air towards the shaft furnace, with the inside of the separating insert (4) and the outer surface of the separating of the insert (4) is an air supply. Burner for burning gaseous fuel in a shaft furnace, in particular for heat treatment of minerals in granular form, according to Claim 1, characterized in that at least one combustion chamber opening (5) is formed between the supply line (2) and the separating insert (4). of air, which connects the forced air supply with the inner space of the separating insert (4). Burner for burning gaseous fuel in a shaft furnace, in particular for heat treatment of minerals in granular form, according to claim 1, characterized in that it has separate air inlets inside the separating insert (4) and air into the gap between the separating insert (4) and the inner surface of the burner chamber (1). Burner for burning gaseous fuel in a shaft furnace, in particular for heat treatment of minerals in granular form, according to any one of claims 1 to 3, characterized in that the cross-sectional shape of the separating insert (4) corresponds to the cross-sectional shape of the burner chamber (1). Burner for burning gaseous fuel in a shaft furnace, in particular for heat treatment of minerals in granular form, according to Claim 4, characterized in that the separating insert (4) has a circular cross section. Burner for burning gaseous fuel in a shaft furnace, in particular for heat treatment of minerals in granular form, according to any one of claims 1 to 5, characterized in that the gap between the separating insert (4) and the inner surface of the burner chamber (1) is at least 10 mm , preferably at least 20 mm Burner for burning gaseous fuel in a shaft furnace, in particular for heat treatment of minerals in granular form, according to any one of claims 1 to 6, characterized in that the nozzle (3) is at least 100 mm away from the inner edge of the chamber (1), preferably at least 250 mm Burner for burning gaseous fuel in a shaft furnace, in particular for heat treatment of minerals in granular form, according to any one of claims 1 to 7, characterized in that the separating insert (4) has a cone (7) at the first end (8), followed by a cylindrical tube (12) and a jacket (11), the jacket (11) extending to the other end (9). Burner for burning gaseous fuel in a shaft furnace, in particular for heat treatment of minerals in granular form, according to claim 8, characterized in that the separating insert (4) comprises a hub (13) intended to be fitted to the supply line (2), the hub (13) is fixed inside the cylindrical tube (12) by means of at least one wing (14). Burner for burning gaseous fuel in a shaft furnace, in particular for heat treatment of minerals in granular form, according to any one of claims 1 to 9, characterized in that the separating insert (4) has at least three ribs (6) oriented on the outer surface in the longitudinal direction. axis. Burner for burning gaseous fuel in a shaft furnace, in particular for heat treatment of minerals in granular form, according to claim 10, characterized in that the ribs (6) extend from the other end (9) to at least 20% of the length of the separating insert (4) , preferably up to at least 40% of the length of the separating insert (4). Burner for burning gaseous fuel in a shaft furnace, in particular for the heat treatment of minerals in granular form, according to any one of claims 1 to 11, characterized in that the separating insert (4) is a weldment, preferably a refractory steel weldment. Burner for burning gaseous fuel in a shaft furnace, in particular for heat treatment of minerals in granular form, according to any one of claims 1, 2, 4 to 12, characterized in that the flow cross section of the combustion air opening (5) at the first end (8) ) reaches up to 40% of the cross-section of the burner chamber (D- Burner for burning gaseous fuel in a shaft furnace, in particular for heat treatment of minerals in granular form, according to Claim 13, characterized in that the combustion air opening (5) has a variable geometry. Burner for burning gaseous fuel in a shaft furnace, in particular for heat treatment of minerals in granular form, according to any one of claims 1 to 14, characterized in that the supply line (2) is connected to a flange (10) which is fixed to air distribution in the axis of the burner chamber (1). S K 8731 Υ1 Burner for burning gaseous fuel in a shaft furnace, in particular for heat treatment of minerals in granular form, according to Claim 15, characterized in that the connection of the flange (10) to the supply line (2) is slidable and mutually sealed by at least one sealing ring A burner for burning gaseous fuel in a shaft furnace, in particular for the heat treatment of minerals in granular form, according to any one of claims 1 to 10, characterized in that it comprises a temperature sensor in the peripheral zone, preferably an optical temperature sensor.