Ammonia-coal mixed combustion system

Abstract

The present disclosure provides an ammonia-coal mixed combustion system. The ammonia-coal mixed combustion system includes a fuel storage tank device, a combustion boiler, a conveying assembly, and an SCR reactor. The fuel storage tank device has a fuel outlet, the combustion boiler has a boiler section and an exhaust section connected in series, the exhaust section has an exhaust port provided on a side of the exhaust section away from the boiler section, the conveying assembly communicates with the fuel outlet and the combustion boiler, the conveying assembly has a burner branch, 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 outlet of the second branch and the outlet of the third branch are connected to the exhaust section and both are located downstream of the outlet of the first branch, the outlet of the fourth branch is located adjacent to the exhaust port, and the SCR reactor is located between the outlet of the fourth branch and the exhaust port.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is filed based on a Chinese patent application having application number 202211275223.X and filing date October 18, 2022, and claims priority to the Chinese patent application, the entire contents of which are incorporated herein by reference. [Technical field]

[0002] The present disclosure relates to the technical field of combustion equipment, and more particularly to an ammonia-coal mixed combustion system. [Background technology]

[0003] In the context of carbon peaking and carbon neutrality, ammonia will replace traditional fossil fuels and become one of the trends in future development. At present, domestic power generation facilities are dominated by coal-fired power generation. The relevant technology uses mixed combustion of pulverized coal and ammonia gas when burning pulverized coal, but the combustion process generates harmful gases such as nitrogen monoxide, which pollutes the environment. Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure aims to solve, at least to some extent, one of the technical problems in the related art. [Means for solving the problem]

[0005] Therefore, the embodiments of the present disclosure provide an ammonia-coal mixed combustion system that realizes cascading utilization of ammonia gas and reduces the emission of harmful gases.

[0006] The ammonia-coal mixed combustion system according to an embodiment of the present disclosure includes a fuel storage tank device having a fuel outlet, a combustion boiler having a boiler section and an exhaust section connected in series, the exhaust section having an exhaust outlet, the exhaust outlet being provided on a side of the exhaust section away from the boiler section, the combustion boiler discharging gas generated in the boiler section, and a conveying assembly communicating with the fuel outlet and the combustion boiler for conveying fuel in the fuel storage tank device to the combustion boiler, the conveying assembly including a burner branch path, a first branch path, a second branch path, a third branch path, and a fourth branch path an outlet of the burner branch is connected to the boiler section, an outlet of the first branch is connected to the exhaust section and located adjacent to the boiler section, an outlet of the second branch and an outlet of the third branch are connected to the exhaust section and both are located downstream of the outlet of the first branch, so that an SNCR reaction occurs at 850°C to 1100°C, and an outlet of the fourth branch is connected to the exhaust section and located adjacent to the exhaust port; and a SCR reactor is provided in the exhaust section and located between the outlet of the fourth branch and the exhaust port.

[0007] The ammonia-coal mixed combustion system according to the embodiment of the present disclosure can reduce the emission of harmful substances by transporting ammonia gas into a combustion boiler using multiple branch paths and reducing nitric oxide in the exhaust gas discharged from the combustion boiler to nitrogen. Therefore, the ammonia-coal mixed combustion system according to the embodiment of the present disclosure can realize cascading use of ammonia gas and reduce the emission of harmful gases.

[0008] In some embodiments, the fuel storage tank apparatus further comprises a liquid ammonia storage tank and a liquid ammonia evaporator, the liquid ammonia storage tank is connected to the liquid ammonia evaporator to convert ammonia in the liquid ammonia storage tank from a liquid state to a gaseous state, an outlet of the liquid ammonia evaporator forms the fuel outlet for discharging vaporized ammonia gas, and the exhaust section is located downstream of the boiler section.

[0009] In some embodiments, one end of the burner branch is connected to the fuel outlet and the other end of the burner branch introduces ammonia gas into the boiler section, one end of the first branch is connected to the fuel outlet and an outlet of the other end of the first branch is located in the exhaust section and introduces the ammonia gas into the exhaust section, one end of the second branch is connected to the fuel outlet and an outlet of the other end of the second branch is located in the exhaust section, one end of the third branch is connected to the fuel outlet and an outlet of the other end of the third branch is located in the exhaust section, one end of the fourth branch is connected to the fuel outlet and an outlet of the other end of the fourth branch is located in the exhaust section.

[0010] In some embodiments, the combustion boiler further comprises a partition screen and a stepped vent, the stepped vent being disposed in the exhaust section and located between the outlet of the first branch and the outlet of the second branch, and the partition screen being disposed between the outlet of the second branch and the outlet of the third branch.

[0011] In some embodiments, the combustion boiler has a boiler wall surrounded by a plurality of side walls and a plurality of combustion assemblies, the boiler wall has an attachment portion, the attachment portion is formed between two of the side walls that are connected, there are a plurality of the combustion assemblies, the plurality of the combustion assemblies correspond one-to-one to the plurality of the attachment portions, and the combustion assemblies are provided on the attachment portions.

[0012] In some embodiments, the combustion assembly includes a frame, a first burner group, and a second burner group, the first burner group including a plurality of first burners, the first burners having a first outlet, the first outlets being mounted on the frame and spaced apart vertically of the frame, the second burner group including a plurality of second burners, the second burners having a second outlet, the second outlets being mounted on the frame, at least one of the second outlets being located on one side of the first burner group and at least one of the second outlets being located on the other side of the first burner group.

[0013] In some embodiments, the first nozzles are disposed in an intermediate portion of the frame, the spacing between the first nozzles is uniform, at least one of the second nozzles is disposed above the first burner group, and at least one of the second nozzles is disposed below the burner group.

[0014] In some embodiments, the second burner has a cylinder and an ignition device, the cylinder has a combustion chamber, one end of the cylinder forms the second outlet, the ignition device has an igniter and a dual-fuel nozzle, the dual-fuel nozzle is provided in the combustion chamber, the dual-fuel nozzle has a housing, the housing has a cavity, and a first gas inlet and a second gas inlet communicating with the cavity, the first gas inlet is connected to an ammonia gas source and the second gas inlet is connected to an air source, thereby mixing air and ammonia gas in the cavity to form a mixed gas, the igniter is connected to the dual-fuel nozzle and ignites the mixed gas in the cavity, and the second burner further has a first heater for heating the ammonia gas flowing to the first gas inlet and a second heater for heating the air flowing to the second gas inlet.

[0015] In some embodiments, the second burner further comprises an ammonia supply line and an air supply line, one end of the ammonia supply line connected to the ammonia gas source and the other end of the ammonia supply line communicating with the cavity via the first gas inlet, the first heater being provided in the ammonia supply line, one end of the air supply line connected to the air source and the other end of the air supply line communicating with the cavity via the second gas inlet, and the second heater being provided in the air supply line.

[0016] In some embodiments, the housing has a combustion port, and an ignition section and a combustion section connected in series, the ignition section is located below the combustion section in a height direction of the multi-fuel nozzle, the first gas inlet and the second gas inlet are provided in the ignition section, the combustion port is provided at an end of the combustion section away from the ignition section, the igniter is provided in the ignition section, and a cross-sectional area of ​​the combustion section gradually decreases in a direction from the ignition section toward the combustion section.

[0017] In some embodiments, the dual-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 gas 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 gas inlet.

[0018] In some embodiments, the cross-sectional area of ​​the ignition section is constant along the height direction of the dual-fuel nozzle, and the axis of the first connecting pipe and / or the axis of the second connecting pipe are perpendicular to the axis of the ignition section. In some embodiments, an axis of the first connecting pipe is parallel to an 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.

[0019] In some embodiments, the tube has an inner sleeve, an intermediate sleeve and an outer sleeve, the intermediate sleeve is fitted over the outside of the inner sleeve, the outer sleeve is fitted over the outside of the intermediate sleeve, one end of the inner sleeve is used to introduce fuel, one end of the intermediate sleeve and one end of the outer sleeve are both used to introduce air, the inner sleeve has a sleeve cavity, and the other end of the sleeve cavity adjacent to the inner sleeve forms the combustion chamber.

[0020] In some embodiments, the other end of the intermediate layer sleeve is located between the other end of the inner layer sleeve and the other end of the outer layer sleeve. [Brief description of the drawings]

[0021] [Figure 1] 1 is a schematic diagram of an ammonia-coal mixed combustion system according to an embodiment of the present disclosure. FIG. [Diagram 2] FIG. 1 is a schematic configuration diagram of a combustion boiler of an ammonia-coal mixed combustion system according to an embodiment of the present disclosure. [Diagram 3] FIG. 1 is a schematic diagram of a combustion assembly of an ammonia-coal mixed combustion system according to an embodiment of the present disclosure. [Figure 4] FIG. 1 is a schematic diagram of a combustion assembly of an ammonia-coal mixed combustion system according to an embodiment of the present disclosure. [Diagram 5] FIG. 2 is a schematic configuration diagram of a second burner of an ammonia-coal mixed combustion system according to an embodiment of the present disclosure. [Figure 6] FIG. 2 is a schematic diagram of a mixed combustion nozzle of an ammonia-coal mixed combustion system according to an embodiment of the present invention. [Figure 7] FIG. 2 is a schematic diagram of a co-combustion nozzle of an ammonia-coal co-combustion system according to an embodiment of the present disclosure. [Figure 8] 8 is a schematic cross-sectional view taken along the line AA in FIG. 7. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, the embodiments of the present disclosure will be described in detail, and an example of the embodiments is illustrated in the drawings. The embodiments described below with reference to the drawings are merely illustrative and are for the purpose of explaining the present disclosure, and should not be understood as limitations on the present disclosure.

[0023] As shown in FIGS. 1 to 8, an ammonia-coal mixed combustion system according to an embodiment of the present disclosure includes a fuel storage tank device 1, a combustion boiler 2, a transport assembly 6, and an SCR reactor 7.

[0024] The fuel storage tank device 1 has a fuel exhaust port 121. The combustion boiler 2 has a boiler section 21 and an exhaust section 22 connected in series, and the exhaust section 22 has an exhaust port, which is provided on the side of the exhaust section 22 away from the boiler section 21, and discharges gas generated in the boiler section 21.

[0025] As shown in FIG. 1, the fuel storage tank device 1 further includes a liquid ammonia storage tank 11 and a liquid ammonia evaporator 12. The liquid ammonia storage tank 11 is connected to the liquid ammonia evaporator 12, so that the ammonia in the liquid ammonia storage tank 11 is converted from a liquid state to a gaseous state. The outlet of the liquid ammonia evaporator 12 forms a fuel exhaust port 121 for discharging 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.

[0026] The conveying assembly 6 communicates with the fuel outlet 121 and the combustion boiler 2 to convey the fuel in the fuel storage tank device 1 to the combustion boiler 2. The conveying assembly 6 has a burner branch 61, 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 installed 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 both are arranged downstream of the outlet of the first branch 62, so that the SNCR reaction occurs at 850°C to 1100°C, and the outlet of the fourth branch 65 is connected to the exhaust section 22 and is installed adjacent to the exhaust port.

[0027] The SCR reactor 7 is provided in the exhaust section 22 and is located between the outlet of the fourth branch 65 and the exhaust port.

[0028] 1, the burner branch passage has one end connected to the fuel outlet 121 and the other end configured to introduce ammonia gas into the boiler section 21. The first branch passage 62 has one end connected to the fuel outlet 121 and the other end outlet provided in the exhaust section 22 and configured to introduce ammonia gas into the exhaust section 22. Similarly, the second branch passage 63 has one end connected to the fuel outlet 121 and the other end outlet provided in the exhaust section 22, the third branch passage 64 has one end connected to the fuel outlet 121 and the other end outlet provided in the exhaust section 22, and the fourth branch passage 65 has one end connected to the fuel outlet 121 and the other end outlet provided in the exhaust section 22.

[0029] 1, the combustion boiler 2 has a partition screen 9 and a stepped vent 8, which is provided in the exhaust section 22 and is located between the outlet of the first branch passage 62 and the outlet of the second branch passage 63. The partition screen 9 is located between the outlet of the second branch passage 63 and the outlet of the third branch passage 64.

[0030] The temperature of the flue gas after combustion in the boiler section 21 gradually decreases in the direction of exhaust from the exhaust section 22. That is, the temperature of the flue gas close to the boiler section 21 is the highest, and the temperatures at the outlet of the first branch passage 62, the outlet of the second branch passage 63, the outlet of the third branch passage 64, and the outlet of the fourth branch passage 65 gradually decrease.

[0031] The outlet of the second branch passage 63 is located on the side of the partition screen 9 adjacent to the boiler section 21, and the outlet of the third branch passage 64 is located on the side of the partition screen 9 adjacent to the outlet of the third branch passage 64.

[0032] That is, the ammonia-coal mixed combustion system according to the embodiment of the present disclosure transports ammonia gas into the combustion boiler 2 using multiple branch paths, and introduces the ammonia gas into different temperature sections of the combustion boiler 2 using the transport assembly 6, thereby reducing nitric oxide in the exhaust gas discharged after combustion in the combustion boiler 2 to nitrogen, thereby reducing the emission of harmful substances.

[0033] Therefore, the ammonia-coal mixed combustion system according to the embodiment of the present disclosure can realize cascaded utilization of ammonia gas and reduce the emission of harmful gases.

[0034] In some embodiments, the combustion boiler 2 has a boiler wall 23 surrounded by a plurality of side walls, and a plurality of combustion assemblies 24. The boiler wall 23 has an attachment portion 231, and the attachment portion 231 is formed between two connected side walls, and there are a plurality of combustion assemblies 24, and the plurality of combustion assemblies 24 and the plurality of attachment portions 231 correspond one-to-one, and the combustion assemblies 24 are provided on the attachment portions 231.

[0035] As shown in Figures 1 and 2, for example, when the tangentially fired boiler 2 is a square tangentially fired boiler 2, the cross section surrounded by the multiple side walls is a regular rectangle, and the mounting portion 231 is formed at the corner of the regular rectangle.

[0036] As shown in the figure, the two side walls to be joined are connected by a connection section, and a mounting portion 231 is formed on the side of the connection section located in the furnace chamber of the tangentially fired boiler 2 .

[0037] 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, the first burners 242 having first nozzles 2421, the plurality of first nozzles 2421 being provided on the frame 241 and spaced apart along the height direction of the frame 241. The second burner 3 group includes a plurality of second burners 3, the second burners 3 having second nozzles 311, the plurality of second nozzles 311 being provided on the frame 241, at least one of the plurality of second nozzles 311 being located on one side of the first burner 242 group, and at least one of the plurality of second nozzles 311 being located on the other side of the first burner 242 group.

[0038] 3 and 4, the multiple first ejection holes 2421 are provided in the middle of the frame 241, and the multiple first ejection holes 2421 are uniformly spaced apart, which results in a more uniform and stable combustion effect when the multiple first burners 242 are used. At least one of the multiple second ejection holes 311 is provided above the first burner 242 group, and at least one of the multiple second ejection holes 311 is provided below the burner group.

[0039] As shown in FIG. 3, two of the plurality of second jet ports 311 are provided above the first burner 242 group, and one of the plurality of second jet ports 311 is provided below the first burner 242 group.

[0040] The first burner 242 may be a direct current burner.

[0041] As shown in Fig. 5, the second burner 3 has a cylindrical body 31 and an ignition device 32, the cylindrical body 31 has a combustion chamber 3121, one end of the cylindrical body 31 forms a second nozzle 311, the ignition device 32 has an igniter 321 and a mixed combustion nozzle 322, the mixed combustion nozzle 322 is provided in the combustion chamber 3121, the mixed combustion nozzle 322 has a housing 3221, the housing 3221 has a cavity 3222, and a first gas inlet 32212 and a second gas inlet 32213 communicating with the cavity 3222. The first gas inlet 32212 is connected to an ammonia gas source, and the second gas inlet 32213 is connected to an air source, so that air and ammonia gas are mixed in the cavity 3222 to form a mixed gas. The igniter 321 is connected to the mixed combustion nozzle 322 to ignite the mixed gas in the cavity 3222. The second burner 3 further comprises a first heater 41 for heating the ammonia gas flowing to the first gas inlet 32212 and a second heater 51 for heating the air flowing to the second gas inlet 32213 .

[0042] In addition, since a mixture of heated ammonia gas and air is contained in the cavity 3222 of the multi-fuel nozzle 322 before the multi-fuel nozzle 322 is ignited by the igniter 321, the mixture can be more easily ignited using the igniter 321. Since fuel or a mixture of fuel and air can be introduced into the combustion chamber 3121 of the cylindrical body 31, the ignited mixture can ignite the fuel in the combustion chamber 3121, thereby improving the combustion effect of the combustion assembly 24 according to the embodiment of the present disclosure.

[0043] That is, the second burner 3 in the ammonia-coal co-combustion system according to the embodiment of the present disclosure can preheat ammonia gas and air separately before they enter the co-combustion nozzle 322, reducing the ignition energy and facilitating ignition. In addition, since pre-heating the mixture is accompanied by certain risks, the combustion assembly 24 according to the embodiment of the present disclosure can pre-heat ammonia gas and air separately, improving safety during ignition.

[0044] The second burner 3 may be an ammonia-coal burner. That is, when the combustion assembly 24 according to the embodiment of the present disclosure is installed in a boiler and used, the ignition path of the pulverized coal is long, so that two second burners 3 are provided above the first burner 242 group to ensure sufficient combustion of the pulverized coal. In addition, when the boiler is under low load, the combustion assembly 24 can obtain a better combustion stabilization effect by providing one second burner 3 below the first burner 242 group.

[0045] In some embodiments, the second burner 3 further comprises 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, the other end of the ammonia supply line 4 is in communication with the cavity 3222 via the first gas inlet 32212, and a first heater 41 is provided in the ammonia supply line 4. One end of the air supply line 5 is connected to an air source, the other end of the air supply line 5 is in communication with the cavity 3222 via the second gas inlet 32213, and a second heater 51 is provided in the air supply line 5.

[0046] 6 and 7, the other end of the ammonia supply pipe 4 is connected to the housing 3221, and the outlet of the ammonia supply pipe 4 is connected to the cavity 3222 of the mixed combustion nozzle 322, so that ammonia gas can be supplied into the cavity 3222 of the mixed combustion nozzle 322 via the first gas inlet 32212. The other end of the air supply pipe 5 is connected to the housing 3221, and the outlet of the air supply pipe 5 is connected to the cavity 3222 of the mixed combustion nozzle 322, so that air can be supplied into the cavity 3222 of the mixed combustion nozzle 322 via the second gas inlet 32213.

[0047] In addition, since the first heater 41 is provided in the ammonia supply pipe 4, the ammonia gas in the ammonia supply pipe 4 can be heated. Then, the heated ammonia gas is supplied into the cavity 3222 of the multi-fuel nozzle 322 via the first gas inlet 32212. Similarly, since the second heater 51 is provided in the air supply pipe 5, the air in the air supply pipe 5 can be heated. Then, the heated air is supplied into the cavity 3222 of the multi-fuel nozzle 322 via the second gas inlet 32213. This prevents the mixed ammonia gas and air from being heated, and ensures the safety of the combustion assembly 24 according to the embodiment of the present disclosure.

[0048] In some embodiments, the housing 3221 has a combustion port 32215, and an ignition section 32211 and a combustion section 32214 connected in series, the ignition section 32211 is located below the combustion section 32214 in the height direction of the multi-fuel nozzle 322, the first gas inlet 32212 and the second gas inlet 32213 are provided in the ignition section 32211, the combustion port 32215 is provided at an end of the combustion section 32214 away from the ignition section 32211, and the igniter 321 is provided in the ignition section 32211.

[0049] As shown in FIG. 6, the combustion section 32214 is located above the ignition section 32211, and ammonia gas can enter the ignition section 32211 via a first gas inlet 32212, and air can enter the ignition section 32211 via a second gas inlet 32213.

[0050] It is noted that the combustion port 32215 is located at the top of the combustion section 32214 and is away from the first gas inlet 32212 and the second gas inlet 32213, which is beneficial for mixing the ammonia gas with the air. After the ammonia gas and the air are mixed, the mixed gas can be ignited using the igniter 321 located in the ignition section 32211.

[0051] 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 the bottom to the top, that is, after the mixed gas in the cavity 3222 of the dual-fuel nozzle 322 is ignited, the structure of the combustion section 32214, which is wider at the bottom and narrower at the top, allows the burning flame to be sprayed farther and more concentrated.

[0052] In some embodiments, the multi-fuel 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 gas inlet 32212, and 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 gas inlet 32213.

[0053] As shown in FIG. 6, the rear end of the first connecting pipe 3223 is connected to the ignition section 32211, and the opening at the front end of the first connecting pipe 3223 forms the first gas inlet 32212, and the front end of the second connecting pipe 3224 is connected to the ignition section 32211, and the opening at the rear end of the second connecting pipe 3224 forms the second gas inlet 32213.

[0054] The first connecting pipe 3223 is connected between the ammonia supply pipe 4 and the mixed combustion nozzle 322, which facilitates the connection of the ammonia supply pipe 4. That is, in order to accommodate different shapes of ammonia gas outlets, the shape of the opening of the first connecting pipe 3223 can be changed according to the shape of the ammonia gas outlet of the ammonia supply pipe. Similarly, the second connecting pipe 3224 is connected between the air supply pipe 5 and the mixed combustion nozzle 322, which facilitates the connection of the air supply pipe 5.

[0055] In some embodiments, the cross-sectional area of ​​the ignition section 32211 is constant along the height direction of the dual-fuel nozzle 322, and the axis of the first connecting pipe 3223 and / or the axis of the second connecting pipe 3224 are perpendicular to the axis of the ignition section 32211.

[0056] 6 and 7, 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 perpendicular to the axis of the ignition section 32211, or the axis of the second connecting pipe 3224 is perpendicular to the axis of the ignition section 32211, or the axis of the first connecting pipe 3223 and the axis of the second connecting pipe 3224 are both perpendicular to the axis of the ignition section 32211.

[0057] When the extension direction of the axis of the ignition section 32211 coincides with the vertical direction, the extension direction of at least one of the axis of the first connecting pipe 3223 and the axis of the second connecting pipe 3224 is perpendicular to the vertical direction.

[0058] 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 axis of the first connecting pipe 3223 and the axis of the second connecting pipe 3224. 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 coincide with the front-rear direction, and there is a gap between the axis of the first connecting pipe 3223 and the axis of the second connecting pipe 3224 in the left-right direction.

[0059] That is, ammonia gas and air enter the cavity 3222 of the co-fuel nozzle 322 through the first connecting pipe 3223 and the second connecting pipe 3224 respectively. When the gas enters the co-fuel nozzle 322, the flow direction of the gas is in contact with the side wall of the ignition section 32211, so that the ammonia gas and the air are mixed in an annular shape within the co-fuel nozzle 322, which is more thorough and favorable for the ignition of the mixed gas.

[0060] In some embodiments, the cylinder 31 has an inner layer sleeve 312, an intermediate layer sleeve 313 and an outer layer sleeve 314, the intermediate layer sleeve 313 is fitted onto the outside of the inner layer sleeve 312, the outer layer sleeve 314 is fitted onto the outside of the intermediate layer sleeve 313, one end of the inner layer sleeve 312 is used to introduce fuel, one end of the intermediate layer sleeve 313 and one end of the outer layer sleeve 314 are used to introduce air, and the inside of the other end of the inner layer sleeve 312 forms a combustion chamber 3121.

[0061] 5, the middle layer sleeve 313 is fitted onto the inner layer sleeve 312, and there is a gap between the inner wall surface of the left end of the middle layer sleeve 313 and the outer wall surface of the left end of the inner layer sleeve 312. The outer layer sleeve 314 is fitted onto the middle layer sleeve 313, and there is a gap between the inner wall surface of the outer layer sleeve 314 and the outer wall surface of the middle layer sleeve 313.

[0062] The inner sleeve 312 is used to introduce fuel or a mixture of fuel and air into the combustion chamber 3121, and the flame ejected from the multi-fuel nozzle 322 ignites the fuel in the combustion chamber 3121. The middle sleeve 313 and the outer sleeve 314 are used to introduce air, providing the air necessary for the combustion of the fuel and ensuring the combustion effect.

[0063] In some embodiments, the other end face of intermediate layer sleeve 313 is located between the other end face of inner layer sleeve 312 and the other end face of outer layer sleeve 314 .

[0064] As shown in FIG. 5, the left end surface of the intermediate sleeve 313 is located between the left end surface of the inner sleeve 312 and the left end surface of the outer sleeve 314 .

[0065] Furthermore, after the fuel inside the left end of the inner layer sleeve 312 is ignited, the left end face of the intermediate layer sleeve 313 and the left end face of the outer layer sleeve 314 are located to the left of the left end face of the inner layer sleeve 312, which can better provide the oxygen necessary for fuel combustion, and improve the combustion effect of the burner according to the embodiment of the present disclosure.

[0066] In describing the present disclosure, it should be understood that the orientations or positional relationships indicated by terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "up," "down," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like, are orientations or positional relationships shown based on the drawings, and are intended to facilitate and simplify the description of the present disclosure, and do not indicate or imply that the indicated devices or elements necessarily have a particular orientation or are constructed or operated in a particular orientation, and should not be understood as limitations on the present disclosure.

[0067] Additionally, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying a relative importance or the number of technical features being indicated. Thus, a feature qualified by "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of this disclosure, unless specifically limited, "plurality" means at least two, e.g., two, three, etc.

[0068] In the present disclosure, unless otherwise specified and limited, the terms "attached", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it may be a fixed connection, a removable connection, or an integral one. It may be a mechanical connection, an electrical connection, or a connection that can communicate with each other. It may be a direct connection, an indirect connection through an intermediate medium, an internal communication between two parts, or an interaction relationship between two parts. A person skilled in the art can understand the specific meaning of the above terms in the present disclosure according to the specific situation.

[0069] In this disclosure, unless expressly specified and limited, a first feature being "above" or "below" a second feature means that the first and second features may be in direct contact, or that the first and second features may be in indirect contact via an intermediate medium. And a first feature being "above," "above," or "on the upper surface" of a second feature means that the first feature is directly above or diagonally above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature. A first feature being "below," "below," or "on the lower surface" of a second feature means that the first feature is directly below or diagonally below the second feature, or only means that the horizontal height of the first feature is lower than that of the second feature.

[0070] In the present disclosure, terms such as "one embodiment," "some embodiments," "examples," "particular examples," or "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, exemplary descriptions for the above terms do not necessarily refer to the same embodiment or example. And, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine or combine different embodiments or examples described in this specification and features of different embodiments or examples, unless mutually inconsistent.

[0071] Although the above embodiments have been shown and described, the above embodiments are illustrative and should not be understood as limitations on the present disclosure, and it should be understood that any changes, modifications, substitutions and variations of the above embodiments made by those skilled in the art are within the scope of protection of the present disclosure. [Explanation of symbols]

[0072] 1 Fuel storage tank equipment 11 Liquid ammonia storage tank 12 Liquid ammonia evaporator 121 Fuel outlet 2 Combustion boiler 21 Boiler Section 22 Exhaust Section 221 Exhaust port 23 Boiler wall 231 Mounting part 24 Combustion Assembly 241 Frame 242 First Burner 2421 No. 1 spout 3. Second burner 31 Cylinder 311 2nd spout 312 Inner sleeve 3121 Combustion chamber 313 Mid-layer sleeve 314 Outer sleeve 32 Ignition system 321 Igniter 322 Multi-fuel nozzle 3221 Case 3222 Cavity 32211 Ignition Section 32212 First gas inlet 32213 Second gas inlet 32214 Combustion Section 32215 Combustion vent 3223 First connecting pipe 3224 Second connecting pipe 4. Ammonia supply line 41 No. 1 Heater 5 Air supply line 51 Second Heater 6 Transport Assembly 61 Burner Junction 62 First Turnout 63 Second Junction 64 Third Junction 65 4th Junction 7. SCR Reactor 8-tiered ventilation openings 9 Partition screen

Claims

1. 1. An ammonia and coal mixed combustion system, comprising: a fuel storage tank arrangement having a fuel outlet; A combustion boiler having a boiler section and an exhaust section connected in series, the exhaust section having an exhaust port provided on a side of the exhaust section away from the boiler section, for discharging gas generated in the boiler section; a transport assembly in communication with the fuel outlet and the combustion boiler for transporting fuel in the fuel storage tank device to the combustion boiler, the transport assembly having a burner branch, a first branch, a second branch, a third branch, and a fourth branch, an outlet of the burner branch connected to the boiler section, an outlet of the first branch connected to the exhaust section and located adjacent to the boiler section, an outlet of the second branch and an outlet of the third branch connected to the exhaust section and both located downstream of the outlet of the first branch, whereby an SNCR reaction occurs at 850°C to 1100°C, and an outlet of the fourth branch connected to the exhaust section and located adjacent to the exhaust; an SCR reactor provided in the exhaust section and located between an outlet of the fourth branch and the exhaust port; The combustion boiler has a boiler wall surrounded by a plurality of side walls and a plurality of combustion assemblies; The boiler wall has an attachment portion, and the attachment portion is formed between two of the side walls that are connected, the combustion assemblies are multiple, the multiple combustion assemblies correspond one-to-one to the multiple attachment portions, and the combustion assemblies are provided on the attachment portions.

2. The fuel storage tank apparatus further includes a liquid ammonia storage tank and a liquid ammonia evaporator; 2. The ammonia and coal mixed combustion system according to claim 1, wherein the liquid ammonia storage tank is connected to the liquid ammonia evaporator to convert the ammonia in the liquid ammonia storage tank from a liquid state to a gaseous state, the outlet of the liquid ammonia evaporator forms the fuel outlet for discharging the vaporized ammonia gas, and the exhaust section is located downstream of the boiler section.

3. 2. The ammonia and coal mixed combustion system according to claim 1, wherein one end of the burner branch is connected to the fuel outlet, and the other end of the burner branch introduces ammonia gas into the boiler section, one end of the first branch is connected to the fuel outlet, and an outlet of the other end of the first branch is provided in the exhaust section to introduce the ammonia gas into the exhaust section, one end of the second branch is connected to the fuel outlet, and an outlet of the other end of the second branch is provided in the exhaust section, one end of the third branch is connected to the fuel outlet, and an outlet of the other end of the third branch is provided in the exhaust section, and one end of the fourth branch is connected to the fuel outlet, and an outlet of the other end of the fourth branch is provided in the exhaust section.

4. The combustion boiler further comprises a partition screen and a stepped vent; 2. The ammonia and coal mixed combustion system according to claim 1, wherein the stepped vent is provided in the exhaust section and is located between the outlet of the first branch and the outlet of the second branch, and the partition screen is provided between the outlet of the second branch and the outlet of the third branch.

5. the combustion assembly includes a frame, a first group of burners, and a second group of burners; the first burner group includes a plurality of first burners, each of which has a first nozzle, the plurality of first nozzles being provided on the frame and spaced apart in a height direction of the frame; 2. The ammonia and coal mixed combustion system according to claim 1, wherein the second burner group has a plurality of second burners, the second burners having second nozzles, the plurality of second nozzles being provided on the frame, at least one of the plurality of second nozzles being located on one side of the first burner group, and at least one of the plurality of second nozzles being located on the other side of the first burner group.

6. 6. The ammonia and coal mixed combustion system according to claim 5, wherein the first nozzles are provided in a middle portion of the frame, the first nozzles are uniformly spaced apart from one another, at least one of the second nozzles is provided above the first burner group, and at least one of the second nozzles is provided below the first burner group.

7. The second burner has a cylinder and an ignition device, The cylindrical body has a combustion chamber, and one end of the cylindrical body forms the second ejection port, The ignition device has an igniter and a multi-fuel nozzle, The multi-fuel nozzle is provided in the combustion chamber, and the multi-fuel nozzle has a housing, The housing has a cavity, and a first gas inlet and a second gas inlet communicating with the cavity, the first gas inlet is connected to an ammonia gas source and the second gas inlet is connected to an air source, thereby mixing air and ammonia gas in the cavity to form a mixed gas, the igniter is connected to the dual combustion nozzle and ignites the mixed gas in the cavity, 6. The ammonia and coal mixed combustion system according to claim 5, wherein the second burner further comprises a first heater for heating the ammonia gas flowing to the first gas inlet, and a second heater for heating the air flowing to the second gas inlet.

8. the second burner further comprises an ammonia supply line and an air supply line; one end of the ammonia supply pipe is connected to the ammonia gas source, and the other end of the ammonia supply pipe is connected to the cavity through the first gas inlet, and the first heater is provided in the ammonia supply pipe; 8. The ammonia and coal mixed combustion system according to claim 7, wherein one end of the air supply pipe is connected to the air source, and the other end of the air supply pipe is connected to the cavity through the second gas inlet, and the second heater is provided in the air supply pipe.

9. The housing has a combustion port and an ignition section and a combustion section connected in series, 9. The ammonia and coal mixed combustion system according to claim 8, wherein the ignition section is located below the combustion section in a height direction of the mixed combustion nozzle, the first gas inlet and the second gas inlet are provided in the ignition section, the combustion port is provided at an end of the combustion section away from the ignition section, the igniter is provided in the ignition section, and a cross-sectional area of ​​the combustion section gradually decreases in a direction from the ignition section toward the combustion section.

10. The multi-fuel nozzle further includes a first connecting pipe and a second connecting pipe, 10. The ammonia and coal mixed combustion system according to claim 9, wherein 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 gas inlet, and 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 gas inlet.

11. 11. The ammonia and coal mixed combustion system according to claim 10, 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 are perpendicular to the axis of the ignition section.

12. 12. The ammonia and coal mixed combustion system according to claim 11, 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.

13. The cylindrical body has an inner layer sleeve, a middle layer sleeve, and an outer layer sleeve, 9. The ammonia and coal mixed combustion system according to claim 8, wherein the intermediate sleeve is fitted on the outside of the inner sleeve, the outer sleeve is fitted on the outside of the intermediate sleeve, one end of the inner sleeve is used to introduce fuel, one end of the intermediate sleeve and one end of the outer sleeve are both used to introduce air, the inner sleeve has a sleeve cavity, and the other end of the sleeve cavity adjacent to the inner sleeve forms the combustion chamber.

14. The ammonia and coal co-combustion system according to claim 13 , wherein the other end of the intermediate 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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