Ammonia-coal co-combustion system

Abstract

This invention proposes an ammonia-coal co-combustion system, comprising: a fuel storage tank, a combustion boiler, a conveying assembly, and an SCR reactor. The fuel storage tank includes a discharge port. The combustion boiler includes a boiler section and an exhaust section connected in sequence. The exhaust section includes an exhaust port located on the side of the exhaust section away from the boiler section. The conveying assembly connects the discharge port to the combustion boiler and includes burner branches and a first branch, a second branch, a third branch, and a fourth branch. The outlet of each burner branch is connected to the boiler section. The outlet of the first branch is connected to the exhaust section and located adjacent to the boiler section. The outlets of the second and third branches are connected to the exhaust section and are both located downstream of the outlet of the first branch. The outlet of the fourth branch is located adjacent to the exhaust port. The SCR reactor is located between the outlet of the fourth branch and the exhaust port. This ammonia-coal co-combustion system enables the cascade utilization of ammonia, reducing the emission of harmful gases.

Description

Technical Field

[0001] This invention relates to the field of combustion equipment technology, and more specifically, to an ammonia-coal mixed combustion system. Background Technology

[0002] In the context of achieving carbon peaking and carbon neutrality, ammonia is becoming a trend in replacing traditional fossil fuels. Currently, domestic power generation equipment is mainly coal-fired. In related technologies, pulverized coal combustion involves mixing pulverized coal with ammonia, but this combustion process produces harmful gases such as nitrogen monoxide, polluting the environment. 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 propose an ammonia-coal co-combustion system that enables the cascade utilization of ammonia gas and reduces the emission of harmful gases.

[0005] The ammonia-coal co-combustion system of this invention includes:

[0006] A fuel storage tank device, the fuel storage tank device including a discharge port;

[0007] A combustion boiler, comprising a boiler section and an exhaust section connected in sequence, wherein the exhaust section includes an exhaust port located on the side of the exhaust section away from the boiler section, so as to discharge the gas generated by the boiler section;

[0008] A conveying assembly connects the discharge port to the combustion boiler to convey fuel from the fuel storage tank to the combustion boiler. The conveying assembly includes a burner branch and a first branch, a second branch, a third branch, and a fourth branch. The outlet of the burner branch is connected to the boiler section. The outlet of the first branch is connected to the exhaust section and is located adjacent to the boiler section. The outlets of the second and third branches are connected to the exhaust section and are both located downstream of the outlet of the first branch to allow for SNCR reaction at 850℃-1100℃. The outlet of the fourth branch is connected to the exhaust section and is located adjacent to the exhaust port.

[0009] The SCR reactor is located in the exhaust section and between the outlet of the fourth branch and the exhaust port.

[0010] The ammonia-coal co-combustion system of this invention utilizes multiple branches to transport ammonia gas into the combustion boiler, which can reduce nitric oxide in the exhaust gas discharged from the combustion boiler into nitrogen gas, thereby reducing the emission of harmful substances.

[0011] Therefore, the ammonia-coal co-combustion system of this invention can realize the cascade utilization of ammonia and reduce the emission of harmful gases.

[0012] In some embodiments, the combustion boiler includes a furnace wall surrounded by multiple side walls and multiple combustion components. The furnace wall includes a mounting portion, which is formed between two connected side walls. There are multiple combustion components, and each combustion component corresponds to one of the multiple mounting portions. The combustion components are disposed on the mounting portions.

[0013] In some embodiments, the combustion assembly includes a frame, a first burner group, and a second burner group. 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 group includes a plurality of second burners, each second burner including a second nozzle, and the plurality of second nozzles are disposed on the frame. At least one of the plurality of second nozzles is located on one side of the first burner group, and at least one of the plurality of second nozzles is located on the other side of the first burner group.

[0014] 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.

[0015] 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.

[0016] In some embodiments, 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 air 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 disposed on the gas supply pipeline.

[0017] 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 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.

[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. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the ammonia-coal co-combustion system according to an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the combustion boiler structure of the ammonia-coal mixed combustion system according to an embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram of the combustion components of the ammonia-coal mixed combustion system according to an embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram of the combustion components of the ammonia-coal mixed combustion system according to an embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram of the structure of the second burner in the ammonia-coal mixed combustion system according to an embodiment of the present invention.

[0028] Figure 6 This is a schematic diagram of the structure of the co-combustion nozzle of the ammonia-coal co-combustion system according to an embodiment of the present invention.

[0029] Figure 7 This is a schematic diagram of the structure of the co-combustion nozzle of the ammonia-coal co-combustion system according to an embodiment of the present invention.

[0030] Figure 8 yes Figure 7 Schematic diagram of cross-section at point AA.

[0031] Figure label:

[0032] Fuel storage tank unit 1; liquid ammonia storage tank 11; liquid ammonia evaporator 12; discharge port 121;

[0033] Combustion boiler 2; boiler section 21; exhaust section 22; exhaust port 221; furnace wall 23; mounting section 231; combustion assembly 24; frame 241; first burner 242; first nozzle 2421;

[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] Conveyor assembly 6; burner branch 61; first branch 62; second branch 63; third branch 64; fourth branch 65;

[0039] CSR reactor 7.

[0040] 8 graded air vents;

[0041] 9. Divider screen. Detailed Implementation

[0042] 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.

[0043] like Figures 1-8 As shown, the ammonia-coal co-combustion system of this invention includes: a fuel storage tank device 1, a combustion boiler 2, a conveying assembly 6, and an SCR reactor 7.

[0044] The fuel storage tank device 1 includes a discharge port 121. The combustion boiler 2 includes a boiler section 21 and an exhaust section 22 connected in sequence. The exhaust section 22 includes an exhaust port located on the side of the exhaust section 22 away from the boiler section 21, so as to discharge the gas generated by the boiler section 21.

[0045] Specifically, such as Figure 1 As shown, the fuel storage tank device 1 also includes a liquid ammonia storage tank 11 and a liquid ammonia evaporator 12. The liquid ammonia storage tank 11 and the liquid ammonia evaporator 12 are connected to each other so as to convert the ammonia in the liquid ammonia storage tank 11 from a liquid state to a gaseous state. The outlet of the liquid ammonia evaporator 12 forms a discharge port 121 to discharge the vaporized ammonia gas. The exhaust section 22 is located downstream of the boiler section 21, that is, the exhaust gas generated by combustion in the boiler section 21 can pass through the exhaust section 22 and be discharged from the exhaust port.

[0046] The conveying assembly 6 connects the discharge port 121 to the combustion boiler 2 to convey fuel from the fuel storage tank 1 to the combustion boiler 2. The conveying assembly 6 includes a burner branch 61 and four branches: a first branch 62, a second branch 63, a third branch 64, and a fourth branch 65. The outlet of the burner branch 61 is connected to the boiler section 21. The outlet of the first branch 62 is connected to the exhaust section 22 and is located adjacent to the boiler section 21. The outlets of the second branch 63 and the third branch 64 are connected to the exhaust section 22 and are both located downstream of the outlet of the first branch 62 to allow for SNCR reaction at 850℃-1100℃. The outlet of the fourth branch 65 is connected to the exhaust section 22 and is located adjacent to the exhaust port. The SCR reactor 7 is located in the exhaust section 22 and between the outlet of the fourth branch 65 and the exhaust port.

[0047] Specifically, such as Figure 1As shown, one end of the combustion branch is connected to the discharge port 121, and the other end of the combustion branch is used to introduce ammonia into the boiler section 21. One end of the first branch 62 is connected to the discharge port 121, and the outlet of the other end of the first branch 62 is located in the exhaust section 22 so as to introduce ammonia into the exhaust section 22. Similarly, one end of the second branch 63 is connected to the discharge port 121, and the outlet of the other end of the second branch 63 is located in the exhaust section 22. One end of the third branch 64 is connected to the discharge port 121, and the outlet of the other end of the third branch 64 is located in the exhaust section 22. One end of the fourth branch 65 is connected to the discharge port 121, and the outlet of the other end of the fourth branch 65 is located in the exhaust section 22.

[0048] In addition, such as Figure 1 As shown, the combustion boiler 2 also includes a partition screen 9 and a graded air outlet 8. The graded air outlet 8 is located in the exhaust section 22 and between the outlet of the first branch 62 and the outlet of the second branch 63. The partition screen 9 is located between the outlet of the second branch 63 and the outlet of the third branch 64.

[0049] It is understandable that the flue gas temperature after combustion in boiler section 21 will gradually decrease as it exits from exhaust section 22. That is, the flue gas temperature is highest near boiler section 21, and the temperatures at the outlets of the first branch 62, the second branch 63, the third branch 64, and the fourth branch 65 gradually decrease.

[0050] It should be noted that the exit of the second branch road 63 is located on the side of the separator 9 adjacent to the boiler section 21, and the exit of the third branch road 64 is located on the side of the separator 9 adjacent to the exit of the third branch road 64.

[0051] In other words, the ammonia-coal co-combustion system of this embodiment of the invention uses multiple branches to transport ammonia to the combustion boiler 2, and uses the conveying component 6 to introduce ammonia into different temperature sections of the combustion boiler 2, which can reduce nitric oxide in the exhaust gas discharged after combustion in the combustion boiler 2 into nitrogen, thereby reducing the emission of harmful substances.

[0052] Therefore, the ammonia-coal co-combustion system of this invention can realize the cascade utilization of ammonia and reduce the emission of harmful gases.

[0053] In some embodiments, the combustion boiler 2 includes a furnace wall 23 surrounded by multiple side walls and multiple combustion components 24. The furnace wall 23 includes a mounting portion 231, which is formed between two connected side walls. There are multiple combustion components 24, and each combustion component 24 corresponds to one of the multiple mounting portions 231. The combustion components 24 are disposed on the mounting portions 231.

[0054] Specifically, such as Figure 1 and Figure 2As shown, for example, if the tangentially circular combustion boiler 2 is a quadrangularly circular combustion boiler 2, then the multiple side walls form a cross-section of a regular quadrilateral, and the mounting part 231 is formed at the apex of the regular quadrilateral.

[0055] Optionally, as shown in the figure, the two adjacent sidewalls are connected by a connecting section, which forms an installation part 231 on one side of the furnace cavity of the tangential combustion boiler 2.

[0056] In some embodiments, the combustion assembly 24 includes a frame 241, a first burner 242 group, and a second burner 3 group. The first burner 242 group includes a plurality of first burners 242, each first burner 242 including a first nozzle 2421. The plurality of first nozzles 2421 are disposed on the frame 241 and arranged at intervals along the height direction of the frame 241. The second burner 3 group includes a plurality of second burners 3, each second burner 3 including a second nozzle 311. The plurality of second nozzles 311 are disposed on the frame 241. At least one of the plurality of second nozzles 311 is located on one side of the first burner 242 group, and at least one of the plurality of second nozzles 311 is located on the other side of the first burner 242 group.

[0057] Specifically, such as Figure 3 and Figure 4 As shown, multiple first nozzles 2421 are located in the middle section of the frame 241, and the gaps between the multiple first nozzles 2421 are evenly distributed to ensure that the combustion effect of the multiple first burners 242 is more uniform and stable during use. At least one of the multiple second nozzles 311 is located above the group of first burners 242, and at least one of the multiple second nozzles 311 is located below the group of burners.

[0058] Preferably, such as Figure 3 As shown, two of the plurality of second nozzles 311 are located above the first burner group 242, and one of the plurality of second nozzles 311 is located below the first burner group 242.

[0059] Optionally, the first burner 242 can be a DC burner.

[0060] like Figure 5As shown, 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.

[0061] 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 24 in this embodiment of the invention.

[0062] In other words, the second burner 3 in the ammonia-coal mixed combustion system of this embodiment can preheat the ammonia and air separately before they are introduced into the mixed combustion nozzle 322, which can reduce the ignition energy and facilitate ignition. In addition, since mixed preheating has certain dangers, the combustion component 24 of this embodiment can preheat the ammonia and air separately, which improves the safety during ignition.

[0063] It should be noted that the second burner 3 can be an ammonia-coal burner. That is, when the combustion assembly 24 of this embodiment is installed in the boiler, since the combustion path of pulverized coal is relatively long, two second burners 3 are placed above the first burner 242 group 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 242 group can improve the stable combustion effect of the combustion assembly 24.

[0064] In some embodiments, the second burner 3 further includes an ammonia supply line 4 and an air supply line 5. One end of the ammonia supply line 4 is connected to an ammonia gas source, and the other end of the ammonia supply line 4 is connected to a cavity 3222 through a first air inlet 32212. A first heater 41 is disposed on the ammonia supply line 4. One end of the air supply line 5 is connected to an air source, and the other end of the air supply line 5 is connected to a cavity 3222 through a second air inlet 32213. A second heater 51 is disposed on the air supply line 5.

[0065] Specifically, such as Figures 6-7 As shown, the other end of the ammonia supply pipeline 4 is connected to the housing 3221, and the outlet of the ammonia supply pipeline 4 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 5 is connected to the housing 3221, and the outlet of the gas supply pipeline 5 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.

[0066] Understandably, the first heater 41 is located on the ammonia supply line 4, which heats the ammonia gas on the ammonia supply line 4, 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 5, which heats the air on the air supply line 5, 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, thereby ensuring the safety of the combustion assembly 24 in this embodiment of the invention.

[0067] 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.

[0068] Specifically, such as Figure 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.

[0069] 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.

[0070] 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. As shown in the figure, the cross-sectional area of ​​the combustion section 32214 gradually decreases from bottom to top. That is to say, after the mixture 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.

[0071] 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.

[0072] Specifically, such as Figure 6 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.

[0073] It is understandable that the first connecting pipe 3223 is connected between the ammonia supply line 4 and the combustion nozzle 322 to facilitate the connection of the ammonia supply line 4. 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 line to accommodate ammonia outlets of different shapes. Similarly, the second connecting pipe 3224 is connected between the gas supply line 5 and the combustion nozzle 322 to facilitate the connection of the gas supply line 5.

[0074] 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.

[0075] Specifically, such as Figure 6 and Figure 7As 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.

[0076] 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.

[0077] 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 shown in the figure, the extending direction of the axis of the first connecting pipe 3223 and the extending direction of the axis of the second connecting pipe 3224 are consistent with the front-back direction, and there is a gap between the axes of the first connecting pipe 3223 and the second connecting pipe 3224 in the left-right direction.

[0078] 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.

[0079] 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.

[0080] Specifically, such as Figure 5 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.

[0081] 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.

[0082] 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.

[0083] Specifically, such as Figure 5 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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. An ammonia-coal hybrid combustion system, characterized by, The application relates to a fuel tank device, a combustion boiler and a combustion assembly. The fuel tank device comprises a discharge port; The combustion boiler comprises a boiler section and an exhaust section connected in sequence, and the exhaust section comprises an exhaust port arranged on the side of the exhaust section away from the boiler section to discharge the gas generated by the boiler section; A conveying assembly is arranged to communicate the discharge port and the combustion boiler to convey the fuel in the fuel tank device into the combustion boiler, and the conveying assembly comprises a burner branch and a first branch, a second branch, a third branch and a fourth branch, the outlet of the burner branch is connected to the boiler section to introduce ammonia gas as fuel into the boiler section, the outlet of the first branch is connected to the exhaust section and arranged adjacent to the boiler section, the outlets of the second branch and the third branch are connected to the exhaust section and arranged downstream of the outlet of the first branch to cause SNCR reaction at 850-1100 DEG C, and the outlet of the fourth branch is connected to the exhaust section and arranged adjacent to the exhaust port; An SCR reactor is arranged in the exhaust section between the outlet of the fourth branch and the exhaust port; The combustion boiler comprises a plurality of side walls and a plurality of combustion assemblies, and 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, and the first burner comprises a first nozzle, and a plurality of the first nozzles are arranged on the frame in the height direction of the frame; The second burner group comprises a plurality of second burners, and the second burner comprises a second nozzle, and a plurality of the second nozzles are arranged on the frame, at least one of the plurality of the second nozzles is arranged on one side of the first burner group, and at least one of the plurality of the second nozzles is arranged on the other side of the first burner group, The second burner comprises a cylinder and an ignition device, the cylinder has a combustion chamber, one end of the cylinder forms the second nozzle, the ignition device comprises an igniter and a mixed combustion nozzle, the mixed combustion nozzle is arranged in the combustion chamber, the mixed combustion nozzle comprises a shell, the shell has a cavity and a first air inlet and a second air inlet communicated with the cavity, the first air inlet is connected to an ammonia gas source, the second air inlet is connected to an air source to mix the air and the ammonia gas in the cavity to form mixed gas, and the igniter is connected to the mixed combustion nozzle to ignite the mixed gas in the cavity The second burner further comprises a first heater and a second heater, the first heater is used for heating the ammonia gas introduced into the first air inlet, and the second heater is used for heating the air introduced into the second air inlet.

2. The ammonia-coal hybrid combustion system of claim 1, wherein, The furnace wall comprises a mounting portion formed between two connected side walls, the combustion assembly is arranged on the mounting portion, and the combustion assembly is arranged on the mounting portion.

3. The ammonia-coal hybrid combustion system of claim 2, wherein, The second burner further comprises an ammonia supply pipeline and an air supply pipeline, One end of the ammonia supply pipeline is connected with the ammonia gas source, the other end of the ammonia supply pipeline is communicated with the cavity through the first gas inlet, the first heater is arranged on the ammonia supply pipeline, One end of the gas supply pipeline is connected with the air gas source, the other end of the gas supply pipeline is communicated with the cavity through the second gas inlet, the second heater is arranged on the gas supply pipeline.

4. The ammonia-coal hybrid combustion system of claim 3, wherein, The shell comprises a combustion port and sequentially connected ignition section and combustion section, the ignition section is below the combustion section in the height direction of the mixed combustion nozzle, the first gas inlet and the second gas inlet are arranged on the ignition section, the combustion port is arranged at one end of the combustion section away from the ignition section, the igniter is arranged on the ignition section, and the cross-sectional area of the combustion section gradually decreases in the direction from the ignition section to the combustion section.

5. The ammonia-coal hybrid combustion system of claim 4, wherein, The mixed combustion nozzle further comprises a first connecting pipe and a second connecting pipe, one end of the first connecting pipe is connected with the ignition section, the other end of the first connecting pipe forms the first gas inlet, one end of the second connecting pipe is connected with the ignition section, and the other end of the second connecting pipe forms the second gas inlet.

6. The ammonia-coal hybrid combustion system of claim 5, wherein, The cross-sectional area of the ignition section is constant along the height direction of the mixed combustion nozzle, and the axis of the first connecting pipe and / or the axis of the second connecting pipe is perpendicular to the axis of the ignition section.

7. The ammonia-coal hybrid combustion system of claim 6, wherein, 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.

8. The ammonia-coal hybrid combustion system of claim 3, wherein, The cylinder body comprises an inner layer sleeve, a middle layer sleeve and an outer layer sleeve, the middle layer sleeve is sleeved outside the inner layer sleeve, the outer layer sleeve is sleeved outside the middle layer sleeve, one end of the inner layer sleeve is used for passing fuel, one end of the middle layer sleeve and one end of the outer layer sleeve are used for passing air, the inner layer sleeve comprises a pipe cavity, and the pipe cavity is adjacent to the other end of the inner layer sleeve to form the combustion chamber.

9. The ammonia-coal hybrid combustion system of claim 8, wherein, The other end of the middle layer sleeve is located between the other end of the inner layer sleeve and the other end of the outer layer sleeve.

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