Burner

Abstract

The present invention relates to a burner capable of combusting ammonia together with fuel, and suppressing generation of nitrogen oxides. The burner according to one embodiment comprises: an ignition tube for accommodating an igniter; an ammonia supply pipe disposed to encompass the ignition pipe, thereby injecting ammonia; an air supply pipe disposed to encompass the ammonia supply pipe, thereby injecting primary air; a fuel supply pipe which is disposed to encompass the air supply pipe, and which has a plurality of fuel channels for injecting fuel; and a burner body encompassing the fuel supply pipe and having an air channel for injecting secondary air.

Description

burner

[0001] The present invention relates to a burner capable of burning ammonia together with fuel and suppressing the generation of nitrogen oxides.

[0002] As the severity of climate change and the need for a response have become increasingly prominent, demands for establishing carbon reduction policies and achieving reduction targets are intensifying. For example, most fuels used in various burners are carbon-based fossil fuels such as LNG, LPG, process byproduct gas, oil, and coal; therefore, a solution is emerging to fundamentally and directly reduce carbon emissions during combustion by replacing these carbon-based fuels with carbon-free combustible materials, or carbon-free fuels.

[0003] Ammonia is frequently cited as a representative carbon-free fuel. Interest in ammonia began as a promising intermediate medium for the economical and stable transport of hydrogen; however, because it is a flammable substance with a higher calorific value per unit volume than hydrogen, it can be directly utilized as fuel in burners.

[0004] However, compared to fossil fuels, ammonia requires a higher energy for ignition and has a significantly lower theoretical flame propagation velocity, resulting in poor combustibility; furthermore, the nitrogen components contained in the fuel increase the likelihood of fuel-NOx levels in the flue gas. Therefore, a method is required to burn ammonia stably and effectively.

[0005] (Patent Document 1) KR 2024-0009596 A

[0006] The present invention aims to provide a burner capable of burning ammonia together with fuel and suppressing the generation of nitrogen oxides.

[0007] A burner according to one embodiment of the present invention may include: an ignition tube that accommodates an igniter; an ammonia supply tube arranged to surround the ignition tube and sprays ammonia; an air supply tube arranged to surround the ammonia supply tube and sprays primary air; a fuel supply tube arranged to surround the air supply tube and having a plurality of fuel channels that spray fuel; and a burner body formed to surround the fuel supply tube and having an air channel that sprays secondary air.

[0008] At least the downstream ends of the ignition pipe, the ammonia supply pipe, the air supply pipe, and the fuel supply pipe can be arranged on a single plane.

[0009] A plurality of partitions are arranged between one end of the fuel supply pipe and one end of the air supply pipe, so that a plurality of fuel channels can be partitioned.

[0010] A plurality of the above-mentioned fuel channels are spaced apart from each other, and a blank is formed between adjacent fuel channels, and inside the fuel supply pipe, the fuel channels and the blank can be alternately arranged along the circumferential direction.

[0011] The blank may form an additional air channel to inject secondary air, and a porous plate may be provided at the downstream opening of the blank.

[0012] One end of the air supply pipe and one end of the ammonia supply pipe form an air injection port for injecting air, and the ammonia supply pipe includes an ammonia nozzle part at one end, and the ammonia nozzle part may have at least one ammonia nozzle hole.

[0013] The above ammonia nozzle hole may be a ring-shaped slot that extends continuously along the circumferential direction from the ammonia nozzle section.

[0014] Let the distance from the center of the ignition tube to a point corresponding to the average radius of the outer diameter radius and the inner diameter radius of the air injection port be called the first distance (r1), and the distance from the center of the ignition tube to a point corresponding to the average radius of the outer diameter radius and the inner diameter radius of the ammonia nozzle port be called the second distance (r2). Then, the ratio of the second distance (r2 / r1) to the first distance may be within the range of 0.1 to 0.6.

[0015] The above ammonia nozzle holes are multiple, and the multiple ammonia nozzle holes may be spaced apart from each other along the circumferential direction in the ammonia nozzle section.

[0016] When the distance from the center of the ignition tube to a point corresponding to the average radius of the outer diameter radius and the inner diameter radius of the air injection port is called the first distance (r1) and the distance from the center of the ignition tube to the center of the ammonia nozzle hole is called the second distance (r2), the ratio of the second distance to the first distance (r2 / r1) may be within the range of 0.1 to 0.6.

[0017] A plurality of the above-mentioned ammonia nozzle holes are formed as flow paths that are inclined or twisted at a predetermined angle with respect to the axial axis of the ammonia supply pipe over the thickness of the ammonia nozzle section, thereby allowing the ammonia flow to be changed into a swirling flow.

[0018] The above air nozzle may include a plurality of pivot sections arranged at regular intervals in the circumferential direction along the outer surface of the ammonia supply pipe.

[0019] According to an embodiment of the present invention, the effect of reducing the emission of nitrogen oxides during the co-firing of ammonia in a burner is obtained.

[0020] FIG. 1 is a front view illustrating a burner according to a first embodiment of the present invention.

[0021] Figure 2 is a cross-sectional view of Figure 1.

[0022] FIG. 3 is a front view illustrating a burner according to a second embodiment of the present invention.

[0023] Figure 4 is a diagram showing a schematic comparison of the flame structure in the case where mixed fuel is injected in the burner of the present invention and in the case where fuel and ammonia are injected separately without mixing.

[0024] For the sake of convenience of explanation, the burner of the present invention is described using an example where it is applied to a rotary kiln, but the application examples of the present invention are not necessarily limited thereto.

[0025] Here, a rotary kiln is a facility that produces processed raw materials according to the purpose of each process by slowly moving and heating (heat treating) raw materials within a long cylindrical rotating furnace lined with refractory material. Among the heating methods, the direct heating type (refractory type), in which the heat source is located inside the rotating furnace, is a common type; to this end, a burner is inserted into the furnace at one end to supply heat to the layer of raw material particles through the combustion of fuel.

[0026] In rotary kilns, appropriate requirements exist regarding flame characteristics, temperature distribution, and the emission of environmental pollutants in combustion exhaust gases, depending on constraints imposed by the narrow and elongated shape of the furnace and the characteristics of the input fuel and raw materials; therefore, the burner structure and operational control required to satisfy these conditions are critical.

[0027] As with other industrial sectors, carbon-based fossil fuels such as LNG, LPG, process by-product gas, oil, and coal are mostly used as fuel for rotary kiln burners; however, as mentioned above, technologies for utilizing ammonia as fuel are being actively researched.

[0028] In terms of ease of application to existing facilities, co-firing technology involving the combustion of ammonia mixed with traditional fossil fuels in a certain proportion is being considered as a priority.

[0029] For example, to promote stable combustion, a partially premixed or nozzle-mixed burner is proposed in which fuel and ammonia are mixed and then supplied inside the burner, or fuel and ammonia are supplied separately and then mixed, and then the mixed fuel reacts with air to form a central flame.

[0030] Combustion technology utilizing ammonia as fuel is expected to gradually progress to co-firing with increasing ammonia mixing ratios or full-firing technology using only 100% ammonia. However, in reality, there are still few demonstration cases where ammonia has been used as fuel in industrial facilities, including rotary kilns, so there is a lack of consideration regarding appropriate application methods for existing facilities.

[0031] Accordingly, the present invention proposes a diffusion flame type burner structure without a mixing section within the burner, which not only implements basic principles for stable combustion such as multi-stage combustion and the reduction of nitrogen oxides, but also forms a long flame through high-speed injection of fuel, ammonia, and air.

[0032] The present invention is described in detail below with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings.

[0033] FIG. 1 is a front view illustrating a burner according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view of FIG. 1.

[0034] A burner according to the first embodiment of the present invention may include an ignition pipe (10); an ammonia supply pipe (20); an air supply pipe (30); a fuel supply pipe (40); and a burner body (50).

[0035] The ignition tube (10), ammonia supply tube (20), air supply tube (30), fuel supply tube (40), and burner body (50) can all have a hollow interior. In other words, all of these can be formed as roughly tubular members.

[0036] The ignition tube (10) can accommodate an igniter (11), such as an electric ignition rod. Such an igniter can discharge at one end and emit a spark from one end of the ignition tube, that is, the downstream end.

[0037] The ammonia supply pipe (20) is positioned to surround the ignition pipe (10), so that ammonia can be supplied and sprayed through the space between the ignition pipe and the ammonia supply pipe. The ammonia supply pipe may include an ammonia nozzle part (21) at one end.

[0038] The ammonia nozzle section (21) located inside the air supply pipe (30) needs to optimally adopt structural design factors such as the position, size, shape, and quantity of the nozzle holes, and factors such as the velocity or momentum of the injected flow. For example, the shape of the nozzle holes in the ammonia nozzle section can be determined according to the arrangement and shape of the air injection ports of the air supply pipe (30) surrounding it.

[0039] In the burner according to the first embodiment of the present invention, the ammonia nozzle portion (21) may have an ammonia nozzle hole (22) that is a ring-shaped slot extending continuously along the circumferential direction.

[0040] Through the ammonia nozzle hole (22) which is a ring-shaped slot, an amount of ammonia corresponding to, for example, 20% of the lower heating value can be injected. The size of the ammonia nozzle hole can be determined and designed to form a target flow rate at a level of approximately 0.5 momentum ratio between ammonia and primary air.

[0041] The ammonia supply pipe (20) configured in this manner allows ammonia to be injected through the ammonia nozzle hole (22) after ammonia is introduced into the interior. Here, the ammonia may be gaseous ammonia.

[0042] The air supply pipe (30) is positioned to surround the ammonia supply pipe (20) so as to supply and spray air through the space between the ammonia supply pipe and the air supply pipe. One end of the air supply pipe and one end of the ammonia supply pipe may form an air injection port (32) for spraying air.

[0043] Optionally, a plurality of pivot sections (33) may be disposed in the air nozzle (32). Specifically, the pivot sections may be formed as members in the shape of a roughly twisted plate, and a plurality of pivot sections may be arranged at regular intervals in the circumferential direction along the outer surface of the ammonia supply pipe (20).

[0044] For example, the swivel section (33) may be configured to be adjustable in an angle of inclination with respect to the axial axis of the air supply pipe. If necessary, an angle of inclination may be applied to the swivel section to form a swirling flow, or conversely, the swivel section may be positioned parallel to the axis to eliminate the swirling flow.

[0045] By arranging such a plurality of swirling sections (33) in the air nozzle (32), the air flow injected through the air nozzle is changed into a swirling flow, and accordingly, the supply of air that reacts with fuel can be smoothly carried out.

[0046] The primary air injected from the air nozzle (32) of the air supply pipe (30) plays a major role in maintaining combustion and forming flame characteristics in the burner, and additionally, by arranging the swirling section (33), it is possible to form a swirling flow to enhance the mixing and reaction of fuel and air.

[0047] In the burner according to the first embodiment of the present invention, the air injection port (32) and the ammonia nozzle port (22) can maintain a predetermined distance from each other to suppress the generation of nitrogen oxides while securing an appropriate combustion temperature.

[0048] For example, it is preferable that the ratio (r2 / r1) of the second distance (r2) from the center of the burner to the point corresponding to the average radius of the outer diameter and inner diameter of the ammonia nozzle hole (22) to the first distance (r1) from the center of the burner (i.e., the center of the ignition tube (10)) to the point corresponding to the average radius of the outer diameter and inner diameter of the air nozzle (32) is within the range of about 0.1 to 0.6.

[0049] In other words, the ratio (r2 / r1) of the second distance (r2) to the first distance (r1) may mean that the reference circle (C) of the ammonia nozzle hole, which can be drawn with the average radius of the ammonia nozzle hole (22) within the area from the center of the burner to a point corresponding to the average radius of the air nozzle (32), is located away from the center of the burner by a distance corresponding to 10 to 60% of the value of the average radius of the air nozzle.

[0050] If the ratio (r2 / r1) of the second distance (r2) to the first distance (r1) exceeds 0.6, the air nozzle (32) and the ammonia nozzle (22) become too close together, so the effect of separately injecting air and ammonia becomes negligible, and consequently, the generation of nitrogen oxides cannot be suppressed.

[0051] On the other hand, if the ratio (r2 / r1) of the second distance (r2) to the first distance (r1) is less than 0.1, the ignition tube (10) cannot be placed, and a problem arises in that an appropriate combustion temperature cannot be secured.

[0052] The fuel supply pipe (40) is positioned to surround the air supply pipe (30), so that fuel can be supplied and injected through the space between the air supply pipe and the fuel supply pipe. Additionally, a plurality of partitions (41) are positioned between one end of the fuel supply pipe and one end of the air supply pipe, so that a plurality of fuel channels (42) can be partitioned.

[0053] Multiple fuel channels (42) may be spaced apart from each other, and a blank (43) may be positioned between adjacent fuel channels. In other words, fuel channels and blanks may be alternately arranged along the circumferential direction inside the fuel supply pipe (40).

[0054] The fuel supply pipe (40) configured in this manner allows fuel to be injected through a plurality of fuel channels (42) after fuel is introduced into the interior. Here, the fuel may be a gaseous fossil fuel containing carbon, such as natural gas, but is not necessarily limited thereto.

[0055] The burner body (50) forms the outer shape of the burner and is formed to surround the fuel supply pipe (40), so as to supply and inject air through the space between the fuel supply pipe and the burner body. The space between the fuel supply pipe and the burner body may form an air channel (52).

[0056] Optionally, in the burner according to the first embodiment of the present invention, a blank (43) located between adjacent fuel channels (42) may form an additional air channel (54). To this end, a porous plate (55) may be provided at the downstream opening of the blank.

[0057] By means of this porous plate (55), the air flow passing through the additional air channel (54) is changed into multiple branches, and accordingly, the reactivity between the fuel or ammonia and the air is improved so that stable and effective combustion can be achieved.

[0058] A burner according to the first embodiment of the present invention is characterized in that fuel and ammonia are injected separately, and combustion air is distributed and injected in multiple stages.

[0059] Fuel is injected through a plurality of fuel channels (42) located radially outward from the air nozzle (32) of the air supply pipe (30), while ammonia can be injected from an ammonia nozzle hole (22) located radially inward from the air nozzle of the air supply pipe. Therefore, ammonia can be injected over a relatively narrow area, and fuel can be injected over a relatively wide area.

[0060] Combustion air can be divided into primary air injected from the air nozzle (32) of the air supply pipe (30) as described above, and secondary air injected through the air channel (52) between the fuel supply pipe (40) and the burner body (50) and / or an additional air channel (54) within the fuel supply pipe.

[0061] For example, the supply of combustion air in a rotary kiln can be divided into a method in which the combustion air is preheated through a heat recovery device and fed into the rotary furnace, and a method in which it is fed into the burner without preheating.

[0062] When air is preheated and fed into a rotary furnace, a significant amount of the total air, for example, about 80 to 90%, is supplied to the area around the burner in a preheated state, and the remaining air, for example, about 10%, can be separately fed directly into the burner. In this case, the air fed directly into the burner can be divided into multiple stages, namely primary air and secondary air.

[0063] The distribution ratio of primary air and secondary air can be adjusted according to the type of fuel, combustion load, and flame condition. For example, about 20 to 30 percent of the air directly supplied to the burner may be injected as primary air from the air nozzle (32), and the remainder may be injected as secondary air through the air channel (52) and / or additional air channel (54).

[0064] Meanwhile, when the total amount of air is supplied through the burner without preheating, the distribution ratio of primary air and secondary air can likewise be adjusted according to the channel configuration, fuel type, combustion state, etc. For example, about 10% of the amount of air may be injected as primary air from the air nozzle (32), and the remainder may be injected as secondary air through the air channel (52) and / or additional air channel (54).

[0065] In a burner according to the first embodiment of the present invention, at least the ignition pipe (10), the ammonia supply pipe (20), the air supply pipe (30), and the fuel supply pipe (40) may be arranged concentrically, and their downstream ends may be arranged on a single plane.

[0066] By being arranged in this way, the primary air among the total air volume can be consumed while undergoing a proper combustion reaction in a combustion chamber formed around the downstream end of the burner, together with fuel injected from a plurality of fuel channels (42) located radially outside the primary air and ammonia injected from an ammonia nozzle hole (22) located radially inside the primary air.

[0067] In the burner according to the first embodiment of the present invention, which adopts a structure of a diffusion flame method and a multi-stage air supply method as described above, fuel and ammonia are each ignited by a flame emitted from an ignition tube (10) by a discharge at the end of an igniter (11), and low-speed air around the burner is drawn in by the high-speed injection flow of fuel, ammonia, and air, and a flame can be macroscopically formed in the area where mixing and combustion reactions proceed.

[0068] In this flame structure, ammonia is injected separately from the primary air radially, thereby forming a core region within the flame area around the burner that induces a localized ammonia-rich condition to react preferentially with ammonia and a portion of the primary air.

[0069] Through this, ignition of flame-retardant ammonia occurs near the tip of the flame, contributing to overall flame stabilization and simultaneously reducing excessive mixing of combustion air and ammonia, thereby enabling the suppression of nitrogen oxide generation.

[0070] Accordingly, in the burner according to the first embodiment of the present invention, stable ignition and combustion of ammonia are possible, and an appropriate size of a core region where ammonia is excessively concentrated inside the flame is secured, thereby slowing down the combustion reaction and minimizing the reaction from ammonia to nitrogen oxides.

[0071] FIG. 3 is a front view illustrating a burner according to a second embodiment of the present invention.

[0072] A burner according to a second embodiment of the present invention may include an ignition tube (10); an ammonia supply tube (20); an air supply tube (30); a fuel supply tube (40); and a burner body (50).

[0073] The second embodiment shown in FIG. 3 is different only in the shape of the ammonia nozzle hole (24), and the remaining components are identical to the components of the first embodiment. Accordingly, in describing the burner of the second embodiment, the same reference numerals are assigned to components identical to those of the burner according to the first embodiment described above, and the detailed description of their configuration and function is omitted.

[0074] In the burner according to the second embodiment of the present invention, the ammonia nozzle portion (21) may have a plurality of ammonia nozzle holes (24) spaced apart from each other along the circumferential direction. Each ammonia nozzle hole may have a circular cross-sectional shape, but is not necessarily limited thereto.

[0075] Through a plurality of ammonia nozzle holes (24) arranged along the circumferential direction, an amount of ammonia corresponding to, for example, 20% of the lower heating value can be injected. The diameter and number of ammonia nozzle holes can be determined and designed to form a target flow rate at a level of approximately 0.5 momentum ratio between ammonia and primary air.

[0076] The ammonia supply pipe (20) configured in this manner allows ammonia to be injected through a plurality of ammonia nozzle holes (24) after ammonia is introduced into the interior. Here, the ammonia may be gaseous ammonia.

[0077] In this case, optionally, a plurality of ammonia nozzle holes (24) can form a swirling flow of ammonia. Specifically, the plurality of ammonia nozzle holes themselves may be formed as a flow path inclined or twisted at a predetermined angle with respect to the axial axis of the ammonia supply pipe (20) over the thickness of the ammonia nozzle section (21).

[0078] Since a plurality of ammonia nozzle holes (24) are formed into inclined or twisted flow paths, the ammonia flow injected through the ammonia nozzle holes is changed into a swirling flow, and accordingly, the characteristics of combustion can be changed.

[0079] In the burner according to the second embodiment of the present invention, the air injection port (32) and the ammonia nozzle port (24) can maintain a predetermined distance from each other to suppress the generation of nitrogen oxides while securing an appropriate combustion temperature.

[0080] For example, it is preferable that the ratio (r2 / r1) of the second distance (r2) from the center of the burner to the center of the ammonia nozzle hole (24) to the first distance (r1) from the center of the burner (i.e., the center of the ignition tube (10)) to a point corresponding to the average radius of the outer diameter radius and the inner diameter radius of the air nozzle (32) is within the range of about 0.1 to 0.6.

[0081] In other words, the ratio (r2 / r1) of the second distance (r2) to the first distance (r1) may mean that the reference circle (C) of the ammonia nozzle holes, which can be drawn by connecting the centers of the plurality of ammonia nozzle holes (24) within the area from the center of the burner to a point corresponding to the average radius of the air nozzle (32), is located away from the center of the burner by a distance corresponding to 10 to 60% of the value of the average radius of the air nozzle.

[0082] If the ratio (r2 / r1) of the second distance (r2) to the first distance (r1) exceeds 0.6, the air nozzle (32) and the ammonia nozzle hole (24) become too close together, so the effect of separately injecting air and ammonia becomes negligible, and consequently, the generation of nitrogen oxides cannot be suppressed.

[0083] On the other hand, if the ratio (r2 / r1) of the second distance (r2) to the first distance (r1) is less than 0.1, the ignition tube (10) cannot be placed, and a problem arises in that an appropriate combustion temperature cannot be secured.

[0084] In a burner according to a second embodiment of the present invention, at least the ignition pipe (10), the ammonia supply pipe (20), the air supply pipe (30), and the fuel supply pipe (40) may be arranged concentrically, and their downstream ends may be arranged on a single plane.

[0085] By being arranged in this way, the primary air among the total air volume can be consumed while undergoing a proper combustion reaction in a combustion chamber formed around the downstream end of the burner, together with fuel injected from a plurality of fuel channels (42) located radially outside the primary air and ammonia injected from a plurality of ammonia nozzle holes (24) located radially inside the primary air.

[0086] Accordingly, in the burner according to the second embodiment of the present invention, stable ignition and combustion of ammonia are possible, and an appropriate size of the core region where ammonia is excessively concentrated inside the flame is secured, thereby slowing down the combustion reaction and minimizing the reaction from ammonia to nitrogen oxides.

[0087] Furthermore, in the burner according to the second embodiment of the present invention, by changing the ammonia flow injected through the ammonia nozzle holes (24) into a swirling flow, the characteristics of the ammonia and radical core region formation, the characteristics of the mixing of surrounding air and fuel, and the combustion characteristics resulting therefrom can be changed.

[0088] Figure 4 is a diagram showing a schematic comparison of the flame structure in the case where mixed fuel is injected in the burner of the present invention and in the case where fuel and ammonia are injected separately without mixing.

[0089] When ammonia is mixed with fuel in advance and injected through the fuel channel (42) of the fuel supply pipe (40), as shown in FIG. 4 (a), the ammonia reacts rapidly with the fuel and air within the flame region, which can lead to an increase in the emission of nitrogen oxides.

[0090] In addition, increasing the ammonia mixing ratio becomes disadvantageous in terms of combustion stability due to the increase in injection speed resulting from the increase in the volumetric flow rate of the injected mixed fuel.

[0091] As in the present invention, when ammonia is separated from the fuel and injected separately through an ammonia nozzle hole (22) located inside the primary air, as shown in FIG. 4 (b), a core region with an excessive concentration of ammonia is formed inside the macroscopic flame region, thereby enabling the rapid generation of nitrogen oxides through oxidation reactions in the NH3 and NH2 radical stages and mitigating the intensity of OH radicals in the flame region.

[0092] As a result, when co-firing the same amount of ammonia, it is possible to reduce the emission of nitrogen oxides by more than 20% by separating the ammonia from the fuel and supplying it separately compared to the case where ammonia is mixed with the fuel and supplied.

[0093] In addition, increasing the intensity of the primary air swirling flow can change the heat transfer characteristics transferred to the solid layer by shortening the flame toward the burner and widening the flame due to the enhanced reaction between fuel and air, and by forming the location of high temperature generation by the flame closer to the burner, but the combustion intensity increases, which tends to increase the generation of nitrogen oxides.

[0094] Conversely, if the swirling flow intensity of the primary air is lowered, the flame is formed relatively longer and the combustion intensity is somewhat reduced, while the generation of nitrogen oxides is expected to decrease.

[0095] In addition, combustion characteristics can be adjusted by changing the ammonia flow into a swirling flow. For example, when the primary air flow is a swirling flow, the ammonia flow can also be swirled through the ammonia nozzle hole (24) to enhance mixing with the primary air. As shown in FIG. 4 (c), the length of the core region where the ammonia is excessively concentrated can be shortened, and the flame width and flame temperature can be increased, and the heat transfer performance near the burner can be increased accordingly.

[0096] In this way, by adjusting the turning conditions of the ammonia nozzle hole (22 or 24) according to the conditions required during operation, it is possible to achieve appropriate operation between increasing local heat transfer performance by strengthening combustion intensity, securing flame length, and suppressing the generation of nitrogen oxides.

[0097] As described above, according to an embodiment of the present invention, the effect of reducing the emission of nitrogen oxides during the co-firing of ammonia in a burner is obtained.

[0098] The above description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope of the essential characteristics of the present invention.

[0099] Accordingly, the embodiments disclosed in this invention are intended to explain, not limit, the technical concept of the invention, and the scope of the technical concept of the invention is not limited by these embodiments. The scope of protection of this invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of this invention.

[0100] [Explanation of the symbol]

[0101] 10: Ignition tube 11: Ignition device

[0102] 20: Ammonia supply pipe 21: Ammonia nozzle section

[0103] 22, 24: Ammonia nozzle holes 30: Air supply pipe

[0104] 32: Air nozzle 33: Swivel section

[0105] 40: Fuel supply pipe 41: Partition

[0106] 42: Fuel Channel 43: Blank

[0107] 50: Burner body 52: Air channel

[0108] 54: Additional air channel 55: Perforated plate

Claims

1. An ignition tube housing an igniter; An ammonia supply pipe positioned to surround the ignition pipe and spray ammonia; An air supply pipe positioned to surround the above-mentioned ammonia supply pipe and injecting primary air; A fuel supply pipe arranged to surround the above air supply pipe and having a plurality of fuel channels for injecting fuel; and A burner body formed to surround the fuel supply pipe and equipped with an air channel for injecting secondary air. A burner including 2. In Paragraph 1, A burner in which at least the downstream ends of the ignition tube, the ammonia supply tube, the air supply tube, and the fuel supply tube are arranged on a single plane.

3. In Paragraph 1, A burner in which a plurality of partitions are arranged between one end of the fuel supply pipe and one end of the air supply pipe, thereby partitioning a plurality of fuel channels.

4. In Paragraph 3, A plurality of the above fuel channels are spaced apart from each other, and a blank is formed between adjacent fuel channels, and A burner in which the fuel channels and the blanks are alternately arranged along the circumferential direction inside the fuel supply pipe.

5. In Paragraph 4, The above blank forms an additional air channel to inject secondary air, and A burner equipped with a perforated plate at the downstream opening of the above blank.

6. In Paragraph 1, One end of the air supply pipe and one end of the ammonia supply pipe form an air injection port for injecting air, and The above ammonia supply pipe includes an ammonia nozzle portion at one end, and The above ammonia nozzle part is a burner having at least one ammonia nozzle hole.

7. In Paragraph 6, The above ammonia nozzle hole is a burner having a ring-shaped slot that extends continuously along the circumferential direction from the ammonia nozzle section.

8. In Paragraph 7, The distance from the center of the ignition tube to a point corresponding to the average radius of the outer diameter radius and the inner diameter radius of the air nozzle is called the first distance (r1), and When the distance from the center of the ignition tube to a point corresponding to the average radius of the outer diameter radius and the inner diameter radius of the ammonia nozzle hole is called the second distance (r2), A burner in which the ratio (r2 / r1) of the second distance to the first distance is within the range of 0.1 to 0.

6.

9. In Paragraph 6, The above ammonia nozzle holes are a plurality of, and the plurality of ammonia nozzle holes are arranged spaced apart from each other along the circumferential direction in the ammonia nozzle section.

10. In Paragraph 9, The distance from the center of the ignition tube to a point corresponding to the average radius of the outer diameter radius and the inner diameter radius of the air nozzle is called the first distance (r1), and When the distance from the center of the ignition tube to the center of the ammonia nozzle hole is called the second distance (r2), A burner in which the ratio (r2 / r1) of the second distance to the first distance is within the range of 0.1 to 0.

6.

11. In Paragraph 9, A burner in which a plurality of the ammonia nozzle holes are formed as flow paths inclined or twisted at a predetermined angle with respect to the axial axis of the ammonia supply pipe over the thickness of the ammonia nozzle section, thereby changing the ammonia flow into a swirling flow.

12. In Paragraph 6, The above air nozzle is a burner comprising a plurality of pivot sections arranged at regular intervals in the circumferential direction along the outer surface of the ammonia supply pipe.

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