A combustion assembly and tangentially fired boiler

Abstract

The application provides a combustion assembly and a tangential combustion boiler. The combustion assembly comprises a frame, a first burner group and a second burner group. The first burner group comprises a plurality of first burners, each of which comprises a first nozzle. The plurality of first nozzles are arranged on the frame. The second burner group comprises a plurality of second burners, each of which comprises a second nozzle. The plurality of second nozzles are arranged on the frame. Each of the second burners comprises a cylinder body with a combustion chamber and an ignition device. One end of the cylinder body forms the second nozzle. The ignition device comprises an igniter and a mixed combustion nozzle arranged in the combustion chamber. The mixed combustion nozzle comprises a shell with a cavity, a first air inlet and a second air inlet. The first air inlet is connected with an ammonia gas source. The second air inlet is connected with an air source. Air and ammonia gas are mixed in the cavity to form a mixed gas. The igniter is used for burning the mixed gas in the cavity. The combustion assembly has the advantages of high safety.

Description

Technical Field

[0001] This invention relates to the field of combustion equipment technology, and more specifically, to a combustion assembly and a tangential combustion boiler. Background Technology

[0002] Tangential combustion involves injecting pulverized coal (primary air) and secondary air into the furnace at its four corners in an imaginary tangential circle to the furnace center, creating a fireball at the center. In related technologies, a set of burners is arranged at each of the four corners of the furnace, with primary and secondary air alternately arranged in each set, making them direct-flow burners. However, due to the relatively long combustion path of pulverized coal, using direct-flow burners leads to incomplete combustion, resulting in the production of more harmful gases. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention provide a combustion assembly having a second burner that can preheat ammonia and air separately before ignition, reducing the danger of mixing and preheating and having the advantage of high safety.

[0005] The embodiments of the present invention provide a tangential combustion boiler, which has the advantages of good combustion effect and high safety.

[0006] The combustion assembly of this invention includes:

[0007] Frame;

[0008] The first burner group includes a plurality of first burners, each first burner including a first nozzle, and the plurality of first nozzles are disposed on the frame and spaced apart along the height direction of the frame.

[0009] The second burner assembly includes a plurality of second burners, each second burner including a second nozzle. The plurality of second nozzles are disposed on the frame, with at least one of the plurality of second nozzles located on one side of the first burner assembly and at least one of the plurality of second nozzles located on the other side of the first burner assembly.

[0010] The second burner includes a cylinder and an ignition device. The cylinder has a combustion chamber, and one end of the cylinder forms the second nozzle. The ignition device includes an igniter and a mixing nozzle. The mixing nozzle is disposed in the combustion chamber and includes a housing. The housing has a cavity and a first air inlet and a second air inlet communicating with the cavity. The first air inlet is connected to an ammonia gas source, and the second air inlet is connected to an air gas source, so that air and ammonia gas are mixed in the cavity to form a mixture. The igniter is connected to the mixing nozzle to ignite the mixture in the cavity.

[0011] The second burner further includes a first heater and a second heater, the first heater being used to heat the ammonia gas introduced into the first air inlet, and the second heater being used to heat the air introduced into the second air inlet.

[0012] The second burner in the combustion assembly of this embodiment of the invention can preheat ammonia and air separately before they are introduced into the mixed combustion nozzle, which can reduce the ignition energy and facilitate ignition. In addition, since mixed preheating has certain dangers, the combustion assembly of this embodiment of the invention can preheat ammonia and air separately, which improves the safety during ignition.

[0013] Therefore, the combustion assembly of the present invention has the advantage of high safety.

[0014] In some embodiments, the second burner further includes an ammonia supply line and a gas supply line, one end of the ammonia supply line being connected to the ammonia gas source, and the other end of the ammonia supply line communicating with the cavity through the first gas inlet. The first heater is disposed on the ammonia supply line.

[0015] One end of the gas supply pipeline is connected to the air source, and the other end of the gas supply pipeline is connected to the cavity through the second air inlet. The second heater is located on the gas supply pipeline.

[0016] In some embodiments, the housing includes a combustion port and an ignition section and a combustion section connected in sequence. The ignition section is located below the combustion section in the height direction of the mixed combustion nozzle. The first air inlet and the second air inlet are both located on the ignition section. The combustion port is located at one end of the combustion section away from the ignition section. The igniter is located on the ignition section.

[0017] In some embodiments, the cross-sectional area of ​​the combustion section gradually decreases in the direction from the ignition section to the combustion section.

[0018] In some embodiments, the mixed-fuel nozzle further includes a first connecting pipe and a second connecting pipe, one end of the first connecting pipe being connected to the ignition section and the other end of the first connecting pipe forming the first air inlet, one end of the second connecting pipe being connected to the ignition section and the other end of the second connecting pipe forming the second air inlet.

[0019] In some embodiments, the cross-sectional area of ​​the ignition section is constant along the height direction of the combustion nozzle, and the axis of the first connecting pipe and / or the axis of the second connecting pipe are orthogonal to the axis of the ignition section.

[0020] In some embodiments, the axis of the first connecting pipe is parallel to the axis of the second connecting pipe, and there is a gap between the axis of the first connecting pipe and the axis of the second connecting pipe.

[0021] In some embodiments, the cylinder includes an inner sleeve, a middle sleeve, and an outer sleeve. The middle sleeve is sleeved outside the inner sleeve, and the outer sleeve is sleeved outside the middle sleeve. One end of the inner sleeve is used to introduce fuel, and one end of the middle sleeve and one end of the outer sleeve are both used to introduce air. The inner sleeve includes a lumen, and the lumen adjacent to the other end of the inner sleeve forms the combustion chamber.

[0022] In some embodiments, the other end of the middle sleeve is located between the other end of the inner sleeve and the other end of the outer sleeve.

[0023] The tangential combustion boiler of this invention includes a combustion assembly according to any one of the above embodiments. The tangential combustion boiler also includes an installation part and a furnace wall formed by multiple side walls. The installation part is formed between two connected side walls. There are multiple combustion assemblies, and each of the multiple combustion assemblies corresponds to one of the multiple installation parts. The frame is mounted on the installation part. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the combustion assembly according to an embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of the combustion assembly according to an embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of the structure of the second burner of the combustion assembly according to an embodiment of the present invention.

[0027] Figure 4 This is a schematic diagram of the structure of the combustion nozzle of the combustion assembly according to an embodiment of the present invention.

[0028] Figure 5 This is a schematic diagram of the structure of the combustion nozzle of the combustion assembly according to an embodiment of the present invention.

[0029] Figure 6 yes Figure 5 Schematic diagram of cross-section at point AA.

[0030] Figure 7 This is a schematic diagram of the structure of a tangential combustion boiler according to an embodiment of the present invention.

[0031] Figure label:

[0032] Frame 1;

[0033] First burner 2; First nozzle 21;

[0034] Second burner 3; cylinder 31; second nozzle 311; inner sleeve 312; combustion chamber 3121; middle sleeve 313; outer sleeve 314;

[0035] Ignition device 32; Igniter 321; Mixing nozzle 322; Housing 3221; Cavity 3222; Ignition section 32211; First air inlet 32212; Second air inlet 32213; Combustion section 32214; Combustion port 32215; First connecting pipe 3223; Second connecting pipe 3224;

[0036] Ammonia supply pipeline 4; First heater 41;

[0037] Gas supply line 5; Second heater 51;

[0038] 6. Tangentially circular combustion boiler; 61. Side wall; 62. Mounting part. Detailed Implementation

[0039] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0040] The combustion assembly of an embodiment of the present invention will now be described with reference to the accompanying drawings.

[0041] like Figures 1-6 As shown, the combustion assembly of this embodiment of the invention includes: a frame 1, a first burner group 2, and a second burner group 3.

[0042] The first burner group 2 includes multiple first burners 2, each first burner 2 including a first nozzle 21. The multiple first nozzles 21 are disposed on the frame 1 and spaced apart along the height direction of the frame 1. The second burner group 3 includes multiple second burners 3, each second burner 3 including a second nozzle 311. The multiple second nozzles 311 are disposed on the frame 1, at least one of the multiple second nozzles 311 is located on one side of the first burner group 2, and at least one of the multiple second nozzles 311 is located on the other side of the first burner group 2.

[0043] Specifically, such as Figure 1 and Figure 2 As shown, multiple first nozzles 21 are located in the middle section of the frame 1, and the gaps between the multiple first nozzles 21 are evenly distributed to ensure a more uniform and stable combustion effect when the multiple first burners 2 are in use. At least one of the multiple second nozzles 311 is located above the group of first burners 2, and at least one of the multiple second nozzles 311 is located below the group of burners.

[0044] Preferably, such as Figure 1 As shown, two of the plurality of second nozzles 311 are located above the first burner group 2, and one of the plurality of second nozzles 311 is located below the first burner group 2.

[0045] Optionally, the first burner 2 can be a DC burner.

[0046] The second burner 3 includes a cylinder 31 and an ignition device 32. The cylinder 31 has a combustion chamber 3121, and a second nozzle 311 is formed at one end of the cylinder 31. The ignition device 32 includes an igniter 321 and a mixing nozzle 322. The mixing nozzle 322 is disposed in the combustion chamber 3121. The mixing nozzle 322 includes a housing 3221. The housing 3221 has a cavity 3222 and a first air inlet 32212 and a second air inlet 32213 communicating with the cavity 3222. The first air inlet 32212 is used to connect to an ammonia gas source, and the second air inlet 32213 is used to connect to an air gas source so that air and ammonia are mixed in the cavity 3222 to form a mixed gas. The igniter 321 is connected to the mixing nozzle 322 so as to ignite the mixed gas in the cavity 3222. The second burner 3 also includes a first heater 41 and a second heater 51. The first heater 41 is used to heat the ammonia gas introduced into the first air inlet 32212, and the second heater 51 is used to heat the air introduced into the second air inlet 32213.

[0047] It is understood that before being ignited by the igniter 321, the cavity 3222 of the mixed-fuel nozzle 322 contains a mixture of heated ammonia and air, which allows the igniter 321 to ignite the mixture more easily. Fuel or a mixture of fuel and air can be introduced into the combustion chamber 3121 of the cylinder 31, so that the fuel in the combustion chamber 3121 can be ignited by the ignited mixture, thereby improving the combustion effect of the combustion assembly of this embodiment.

[0048] In other words, the second burner 3 in the combustion assembly of this embodiment can preheat ammonia and air separately before they are introduced into the mixing nozzle 322, which can reduce the ignition energy and facilitate ignition. In addition, since mixing and preheating has certain dangers, the combustion assembly of this embodiment can preheat ammonia and air separately, which improves the safety during ignition.

[0049] Therefore, the combustion assembly of the present invention has the advantage of high safety.

[0050] It should be noted that the second burner 3 can be an ammonia-coal burner. That is, when the combustion assembly of this embodiment is installed in a boiler, since the combustion path of pulverized coal is relatively long, two second burners 3 are placed above the first burner group 2 to ensure complete combustion of pulverized coal. In addition, if the boiler is under low load, placing one second burner 3 below the first burner group 2 can improve the stable combustion effect of the combustion assembly.

[0051] In some embodiments, the second burner 3 further includes an ammonia supply pipeline and a gas supply pipeline 54. One end of the ammonia supply pipeline is connected to an ammonia gas source, and the other end of the ammonia supply pipeline is connected to a cavity 3222 through a first air inlet 32212. A first heater 41 is disposed on the ammonia supply pipeline. One end of the gas supply pipeline 54 is connected to an air source, and the other end of the gas supply pipeline 54 is connected to a cavity 3222 through a second air inlet 32213. A second heater 51 is disposed on the gas supply pipeline 54.

[0052] Specifically, such as Figures 3-6 As shown, the other end of the ammonia supply pipeline is connected to the housing 3221, and the outlet of the ammonia supply pipeline is connected to the cavity 3222 of the combustion nozzle 322, so that ammonia gas can be introduced into the cavity 3222 of the combustion nozzle 322 through the first air inlet 32212. The other end of the gas supply pipeline 54 is connected to the housing 3221, and the outlet of the gas supply pipeline 54 is connected to the cavity 3222 of the combustion nozzle 322, so that air can be introduced into the cavity 3222 of the combustion nozzle 322 through the second air inlet 32213.

[0053] Understandably, the first heater 41 is located on the ammonia supply line, which heats the ammonia gas on the line and then introduces the heated ammonia gas into the cavity 3222 of the combustion nozzle 322 through the first air inlet 32212. Similarly, the second heater 51 is located on the air supply line 54, which heats the air on the line and then introduces the heated air into the cavity 3222 of the combustion nozzle 322 through the second air inlet 32213. This avoids heating the mixed ammonia gas and air, thus ensuring the safety of the combustion assembly in this embodiment of the invention.

[0054] In some embodiments, the housing 3221 includes a combustion port 32215 and an ignition section 32211 and a combustion section 32214 connected in sequence. The ignition section 32211 is located below the combustion section 32214 in the height direction of the mixing nozzle 322. The first air inlet 32212 and the second air inlet 32213 are both provided on the ignition section 32211. The combustion port 32215 is provided at the end of the combustion section 32214 away from the ignition section 32211. The igniter 321 is provided on the ignition section 32211.

[0055] Specifically, such as Figures 4-6 As shown, the combustion section 32214 is located above the ignition section 32211. Ammonia can enter the ignition section 32211 through the first air inlet 32212, and air can enter the ignition section 32211 through the second air inlet 32213.

[0056] It is understandable that the combustion port 32215 is located at the upper end of the combustion section 32214 and is far away from the first air inlet 32212 and the second air inlet 32213. Therefore, it is more conducive to the mixing of ammonia and air. After the ammonia and air are mixed, the mixture can be ignited by the igniter 321 located in the ignition section 32211.

[0057] Preferably, the cross-sectional area of ​​the combustion section 32214 gradually decreases in the direction from the ignition section 32211 to the combustion section 32214. For example... Figure 4 As shown, the cross-sectional area of ​​the combustion section 32214 gradually decreases from bottom to top. In other words, after the mixed gas in the cavity 3222 of the mixed combustion nozzle 322 is ignited, the structure of the combustion section 32214, which is wider at the bottom and narrower at the top, allows the combustion flame to be sprayed further and more concentrated.

[0058] In some embodiments, the mixed combustion nozzle 322 further includes a first connecting pipe 3223 and a second connecting pipe 3224. One end of the first connecting pipe 3223 is connected to the ignition section 32211, and the other end of the first connecting pipe 3223 forms a first air inlet 32212. One end of the second connecting pipe 3224 is connected to the ignition section 32211, and the other end of the second connecting pipe 3224 forms a second air inlet 32213.

[0059] Specifically, such as Figure 4 As shown, the rear end of the first connecting pipe 3223 is connected to the ignition section 32211, the front end of the first connecting pipe 3223 is open to form the first air inlet 32212, the front end of the second connecting pipe 3224 is connected to the ignition section 32211, and the rear end of the second connecting pipe 3224 is open to form the second air inlet 32213.

[0060] It is understandable that the first connecting pipe 3223 is connected between the ammonia supply pipeline and the combustion nozzle 322 to facilitate the connection of the ammonia supply pipeline. That is, the opening shape of the first connecting pipe 3223 can be changed according to the different shapes of the ammonia outlet of the ammonia supply pipeline to suit different shapes of ammonia outlets. Similarly, the second connecting pipe 3224 is connected between the gas supply pipeline 54 and the combustion nozzle 322 to facilitate the connection of the gas supply pipeline 54.

[0061] In some embodiments, the cross-sectional area of ​​the ignition section 32211 is constant along the height direction of the combustion nozzle 322, and the axis of the first connecting pipe 3223 and / or the axis of the second connecting pipe 3224 are orthogonal to the axis of the ignition section 32211.

[0062] Specifically, such as Figure 4 and Figure 5 As shown, the cross-section of the ignition section 32211 is circular, that is, the ignition section 32211 is cylindrical. The axis of the first connecting pipe 3223 is orthogonal to the axis of the ignition section 32211; or, the axis of the second connecting pipe 3224 is orthogonal to the axis of the ignition section 32211; or, the axes of the first connecting pipe 3223 and the second connecting pipe 3224 are both orthogonal to the axis of the ignition section 32211.

[0063] It is understandable that if the axial extension direction of the ignition section 32211 is consistent with the vertical direction, then the extension direction of at least one of the axial directions of the first connecting pipe 3223 and the second connecting pipe 3224 is orthogonal to the vertical direction.

[0064] Preferably, the axis of the first connecting pipe 3223 is parallel to the axis of the second connecting pipe 3224, and there is a gap between the axes of the first connecting pipe 3223 and the second connecting pipe 3224. It is understood that, for example, as... Figure 4 As shown, the axial extension direction of the first connecting pipe 3223 and the axial extension direction of the second connecting pipe 3224 are consistent with the front-back direction, and there is a gap between the axial direction of the first connecting pipe 3223 and the axial direction of the second connecting pipe 3224 in the left-right direction.

[0065] In other words, ammonia and air enter the cavity 3222 of the mixing nozzle 322 through the first connecting pipe 3223 and the second connecting pipe 3224 respectively. When the gas enters the mixing nozzle 322, the gas flow direction is tangential to the side wall of the ignition section 32211, so that the ammonia and air are mixed in a ring within the mixing nozzle 322, thereby making the mixing more complete and facilitating the ignition of the mixture.

[0066] In some embodiments, the cylinder 31 includes an inner sleeve 312, a middle sleeve 313, and an outer sleeve 314. The middle sleeve 313 is sleeved outside the inner sleeve 312, and the outer sleeve 314 is sleeved outside the middle sleeve 313. One end of the inner sleeve 312 is used to introduce fuel, and one end of the middle sleeve 313 and one end of the outer sleeve 314 are both used to introduce air. The other end of the inner sleeve 312 forms a combustion chamber 3121.

[0067] Specifically, such as Figure 3 As shown, the middle sleeve 313 is sleeved on the inner sleeve 312, and there is a gap between the inner wall surface of the left end of the middle sleeve 313 and the outer wall surface of the left end of the inner sleeve 312. The outer sleeve 314 is sleeved on the middle sleeve 313, and there is a gap between the inner wall surface of the outer sleeve 314 and the outer wall surface of the middle sleeve 313.

[0068] Understandably, the inner sleeve 312 is used to introduce fuel or a mixture of fuel and air into the combustion chamber 3121 so that the fuel in the combustion chamber 3121 can be ignited by the flame ejected from the mixing nozzle 322. The middle sleeve 313 and the outer sleeve 314 are used to introduce air to provide the air required for fuel combustion, thereby ensuring the combustion effect.

[0069] In some embodiments, the end face of the other end of the middle sleeve 313 is located between the end face of the other end of the inner sleeve 312 and the end face of the other end of the outer sleeve 314.

[0070] Specifically, such as Figure 3 As shown, the left end face of the middle sleeve 313 is located between the left end face of the inner sleeve 312 and the left end face of the outer sleeve 314.

[0071] It is understood that after the fuel inside the left end of the inner sleeve 312 is ignited, the left end face of the middle sleeve 313 and the left end face of the outer sleeve 314 are both located to the left of the left end face of the inner sleeve 312, which can better provide the oxygen required for fuel combustion, thereby making the combustion effect of the burner in this embodiment of the invention better.

[0072] The tangential combustion boiler 6 of the present invention will now be described with reference to the accompanying drawings.

[0073] like Figure 7 As shown, the tangential combustion boiler 6 of this embodiment includes a combustion assembly according to any of the above embodiments. The tangential combustion boiler 6 also includes an installation part 62 and a furnace wall 61 formed by multiple side walls. An installation part 62 is formed between two connected side walls. There are multiple combustion assemblies, and each of the multiple combustion assemblies corresponds to one of the multiple installation parts 62. The frame 1 is mounted on the installation part 62.

[0074] Specifically, such as Figure 7As shown, the tangential combustion boiler 6 is a four-cornered tangential combustion boiler 6, in which multiple side walls form a cross-section of a regular quadrilateral, and the mounting part 62 is formed at the apex of the regular quadrilateral.

[0075] Optionally, such as Figure 7 As shown, the two side walls are connected by a connecting section, which forms an installation part 62 on one side of the furnace cavity of the tangential combustion boiler 6.

[0076] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0077] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0078] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0079] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0080] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0081] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A combustion assembly, characterized by, include: Frame; The first burner group includes a plurality of first burners, each first burner including a first nozzle, and the plurality of first nozzles are disposed on the frame and spaced apart along the height direction of the frame. The second burner assembly includes a plurality of second burners, each second burner including a second nozzle. The plurality of second nozzles are disposed on the frame, with at least one of the plurality of second nozzles located on one side of the first burner assembly and at least one of the plurality of second nozzles located on the other side of the first burner assembly. The second burner includes a cylinder and an ignition device. The cylinder has a combustion chamber, and one end of the cylinder forms the second nozzle. The ignition device includes an igniter and a mixing nozzle. The mixing nozzle is disposed in the combustion chamber and includes a housing. The housing has a cavity and a first air inlet and a second air inlet communicating with the cavity. The first air inlet is connected to an ammonia gas source, and the second air inlet is connected to an air gas source, so that air and ammonia gas are mixed in the cavity to form a mixture. The igniter is connected to the mixing nozzle to ignite the mixture in the cavity. The second burner further includes a first heater and a second heater, wherein the first heater is used to heat the ammonia gas introduced into the first air inlet, and the second heater is used to heat the air introduced into the second air inlet. The housing includes a combustion port and an ignition section and a combustion section connected in sequence. The ignition section is located below the combustion section in the height direction of the mixed combustion nozzle. The first air inlet and the second air inlet are both located on the ignition section. The combustion port is located at the end of the combustion section away from the ignition section. The igniter is located on the ignition section. The cross-sectional area of ​​the combustion section gradually decreases in the direction from the ignition section to the combustion section.

2. The combustion assembly of claim 1, wherein, The second burner further includes an ammonia supply pipeline and a gas supply pipeline. One end of the ammonia supply pipeline is connected to the ammonia gas source, and the other end of the ammonia supply pipeline is connected to the cavity through the first gas inlet. The first heater is disposed on the ammonia supply pipeline. One end of the gas supply pipeline is connected to the air source, and the other end of the gas supply pipeline is connected to the cavity through the second air inlet. The second heater is located on the gas supply pipeline.

3. The combustion assembly according to claim 2, characterized in that, The mixed-fuel nozzle further includes a first connecting pipe and a second connecting pipe. One end of the first connecting pipe is connected to the ignition section, and the other end of the first connecting pipe forms the first air inlet. One end of the second connecting pipe is connected to the ignition section, and the other end of the second connecting pipe forms the second air inlet.

4. The combustion assembly according to claim 3, characterized in that, The cross-sectional area of ​​the ignition section is constant along the height direction of the combustion nozzle, and the axis of the first connecting pipe and / or the axis of the second connecting pipe are orthogonal to the axis of the ignition section.

5. The combustion assembly according to claim 4, characterized in that, The axis of the first connecting pipe is parallel to the axis of the second connecting pipe, and there is a gap between the axis of the first connecting pipe and the axis of the second connecting pipe.

6. The combustion assembly according to claim 2, characterized in that, The cylinder includes an inner sleeve, a middle sleeve, and an outer sleeve. The middle sleeve is sleeved outside the inner sleeve, and the outer sleeve is sleeved outside the middle sleeve. One end of the inner sleeve is used to introduce fuel, and one end of the middle sleeve and one end of the outer sleeve are both used to introduce air. The inner sleeve includes a lumen, and the lumen adjacent to the other end of the inner sleeve forms the combustion chamber.

7. The combustion assembly according to claim 6, characterized in that, The other end of the middle sleeve is located between the other end of the inner sleeve and the other end of the outer sleeve.

8. A tangentially circular combustion boiler, characterized in that, The tangential combustion boiler includes a combustion assembly according to any one of claims 1-7, and further includes an installation part and a furnace wall formed by a plurality of side walls, wherein the installation part is formed between two connected side walls, and there are a plurality of combustion assemblies, each of which corresponds to a plurality of installation parts, and the frame is mounted on the installation part.

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