Ammonia-doped swirl burner and method for adjusting ammonia-doped ratio thereof

Abstract

The present invention discloses an ammonia-doped swirl burner and a method for adjusting the ammonia-doped ratio thereof, wherein the ammonia-doped swirl burner comprises a burner housing, a primary air-powder guide tube for air-powder guidance, at least one wind channel for introducing air, and at least two ammonia channels for introducing ammonia; the primary air-powder guide tube and the at least one wind channel are stacked and arranged in sequence from the inside to the outside, and are both connected to the boiler combustion chamber; the primary air-powder guide tube and the at least one wind channel are respectively connected to an ammonia channel in a one-to-one correspondence. Since the primary air-powder guide tube and the at least one wind channel are respectively connected to an independent ammonia channel, the amount of ammonia entering the primary air-powder guide tube and the wind channel can be adjusted as needed, thereby increasing the adjustment range of the ammonia-doped ratio, which is beneficial to improving combustion efficiency and reducing the generation of nitrogen oxides, thereby meeting environmental protection requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of boilers, and in particular relates to an ammonia-doped swirl burner and a method for adjusting an ammonia-doped ratio thereof. Background Art

[0002] Currently, the huge impact of CO2 on global climate change has received more and more attention. Reducing carbon emissions from power systems dominated by coal-fired power plants is of great significance to reducing carbon peaks.

[0003] Blending carbon-free fuels is a way to reduce carbon emissions from the source, among which ammonia and hydrogen are two carbon-free fuels that have received more attention. Compared with hydrogen, ammonia has the advantages of being easy to liquefy, easy to store and transport, and having mature production and storage infrastructure. Therefore, ammonia has the potential to achieve clean combustion utilization in the short term.

[0004] In order to use ammonia as a fuel in coal-fired power plants and obtain better ignition, stable combustion, burnout and emission characteristics, the structural design of the burner is crucial. However, the existing ammonia-blended swirl burner cannot control the amount of ammonia introduced well, resulting in insufficient mixing of ammonia-blended fuel and oxidant, low combustion efficiency, and high nitrogen oxide emissions, which cannot meet the current safety and environmental protection requirements for burners.

[0005] Therefore, how to overcome the above technical defects is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0006] In view of this, the object of the present invention is to provide an ammonia-doped swirl burner, which can effectively increase the adjustment range of the ammonia-doped ratio, which is beneficial to improving combustion efficiency and reducing the generation of nitrogen oxides, thereby meeting environmental protection requirements.

[0007] Another object of the present invention is to provide a method for adjusting the ammonia blending ratio of an ammonia blending swirl burner.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] An ammonia-doped swirl burner comprises a burner housing, a primary air-powder guide tube for air-powder guidance, at least one air channel for introducing air, and at least two ammonia channels for introducing ammonia;

[0010] The primary air powder guide cylinder and at least one air channel are stacked in sequence from the inside to the outside, and are both connected to the boiler combustion chamber;

[0011] The primary air powder guide cylinder and at least one air channel are respectively connected to one of the ammonia channels in a one-to-one correspondence.

[0012] Optionally, a combustion stabilizing blunt body is also included, and the combustion stabilizing blunt body is arranged at the outlet end of the primary air powder guide tube.

[0013] Optionally, an inspection hole for inserting the ammonia channel is provided on the primary air powder guide cylinder.

[0014] Optionally, any one of the ammonia channels includes a main channel and a branch channel, the main channel is used for ammonia to enter, one end of the branch channel is arranged on the main channel, and the other end extends into the primary air powder guide cylinder or the air channel.

[0015] Optionally, at least one cyclone is further included, and at least one cyclone is disposed in one of the wind passages.

[0016] Optionally, the swirler has axial swirl blades, and an angle is formed between the axial swirl blades and the radial direction of the wind channel, and the angle is 30°-60°.

[0017] A method for adjusting the ammonia blending ratio of an ammonia blending swirl burner, applied to the ammonia blending swirl burner as claimed in any one of the above claims, comprising:

[0018] Obtain the actual load and obtain the load ratio between the actual load and the rated load;

[0019] According to the corresponding relationship between the load ratio and the ammonia mixing ratio, the ammonia mixing ratio of different secondary air is obtained;

[0020] The ammonia blending ratio of different secondary air is adjusted accordingly according to the above-mentioned ammonia blending ratio.

[0021] Optionally, the adjustment method includes: adjusting the ammonia content of low-volatile coal and adjusting the ammonia content of high-volatile coal, wherein the volatile content of low-volatile coal is V daf <20%, the volatile matter content of the high volatile coal is V daf ≥20%.

[0022] Optionally, the ammonia blending ratio adjustment of different secondary air specifically includes the ammonia blending ratio adjustment of tertiary air, which are: primary air ammonia blending ratio adjustment, secondary air ammonia blending ratio adjustment and tertiary air ammonia blending ratio adjustment.

[0023] When the adjustment method is to adjust the ammonia blending ratio of low volatile coal, the corresponding relationship between the load ratio and the ammonia blending ratio is:

[0024] The primary air ammonia ratio adjustment:

[0025]

[0026] The secondary air ammonia ratio adjustment:

[0027]

[0028] The tertiary air ammonia mixing ratio adjustment:

[0029]

[0030] When the adjustment method is to adjust the ammonia blending ratio of high volatile coal, the corresponding relationship between the load ratio and the ammonia blending ratio is:

[0031] The primary air ammonia ratio adjustment:

[0032]

[0033] The secondary air ammonia ratio adjustment:

[0034]

[0035] The tertiary air ammonia mixing ratio adjustment:

[0036]

[0037] Among them, V daf is the dry ash-free volatile matter content of the coal powder, C1 is the ammonia ratio of the primary air, C2 is the ammonia ratio of the secondary air, C3 is the ammonia ratio of the tertiary air, and D is the ratio of the actual heat load of the burner to the rated load.

[0038] It can be seen from the above technical scheme that since the primary air powder guide tube and at least one air channel are respectively connected to a mutually independent ammonia channel, the amount of ammonia entering the primary air powder guide tube and the air channel can be adjusted as needed, thereby increasing the adjustment range of the ammonia blending ratio, which is beneficial to improving combustion efficiency and reducing the generation of nitrogen oxides, thereby meeting environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0040] Figure 1 It is a structural schematic diagram of an ammonia-doped swirl burner disclosed in an embodiment of the present invention;

[0041] Figure 2 Schematic diagram of the positional relationship of the primary ammonia channel, the secondary ammonia channel and the tertiary ammonia channel;

[0042] Figure 3It is a schematic diagram of the cross-sectional structure of the ammonia-doped swirl burner disclosed in an embodiment of the present invention.

[0043] Description of reference numerals:

[0044] 100, burner shell; 200, primary air powder guide tube; 201, inspection hole; 300, secondary air channel; 400, tertiary air channel; 500, primary ammonia channel; 501, primary main channel; 502, primary branch channel; 600, secondary ammonia channel; 601, secondary main channel; 602, secondary branch channel; 700, tertiary ammonia channel; 701, tertiary main channel; 702, tertiary branch channel; 800, combustion stabilizing blunt body; 900, first cyclone; 1000, second cyclone. DETAILED DESCRIPTION

[0045] In view of this, the core of the present invention is to provide an ammonia-doped swirl burner, which can effectively increase the adjustment range of the ammonia-doped ratio, which is beneficial to improving combustion efficiency, reducing the generation of nitrogen oxides, and meeting environmental protection requirements.

[0046] Another core of the present invention is to provide a method for adjusting the ammonia blending ratio of an ammonia blending swirl burner.

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Please refer to Figures 1 to 3 .

[0048] Please refer to Figure 1 and Figure 3 The ammonia-blended swirl burner disclosed in the embodiment of the present invention includes a burner housing 100, a primary air-powder guide tube 200 for air-powder guide, at least one air channel for introducing air, and at least two ammonia channels for introducing ammonia.

[0049] Among them, the primary air powder guide tube and at least one air channel are stacked in sequence from the inside to the outside, and are both connected to the boiler combustion chamber. The primary air powder guide tube 200 and one air channel are respectively connected to an ammonia channel one by one.

[0050] Since the primary air powder guide tube 200 and at least one air channel are respectively connected to an independent ammonia channel, the amount of ammonia entering the primary air powder guide tube 200 and the air channel can be adjusted as needed, thereby increasing the adjustment range of the ammonia blending ratio, which is beneficial to improving combustion efficiency and reducing the generation of nitrogen oxides, thereby meeting environmental protection requirements.

[0051] It should be noted that the generation of nitrogen oxides is the result of the reaction of nitrogen and oxygen at high temperature or under specific chemical conditions. The generation of nitrogen oxides can be reduced by adjusting the amount of ammonia. There are two pathways for ammonia combustion, one is to generate nitrogen oxides in an oxidizing environment, and the other is to generate nitrogen in a reducing environment. The difference lies in the atmosphere of the combustion environment. This burner precisely controls the generation of fuel nitrogen oxides and effectively reduces them by adjusting the atmosphere of the local area inside it, thereby achieving the purpose of reducing nitrogen oxides.

[0052] As a further embodiment, the ammonia-doped swirl burner disclosed in the embodiment of the present invention further includes a combustion stabilizing blunt body 800, wherein the combustion stabilizing blunt body 800 is arranged at the outlet end of the primary air powder guide tube 200. In this way, a mixture of air carrying coal powder and ammonia can form a reflux at the outlet end of the primary air powder guide tube 200.

[0053] It should be noted that an inspection hole 201 for inserting an ammonia channel is provided on the primary air powder guide cylinder 200 . The ammonia channel can be inserted into the primary air powder guide cylinder 200 and communicated with the primary air powder guide cylinder 200 .

[0054] It is worth noting that in addition to providing a passage for the ammonia channel to enter the primary air powder guide tube 200, the inspection hole 201 can also effectively avoid wear between the ammonia channel and the primary air powder guide tube 200 at this position, thereby extending the service life of the primary air powder guide tube 200, and the operator can also check and observe whether the inside of the burner is operating normally through the inspection hole 201, further facilitating maintenance.

[0055] In order to improve the stability of the ammonia passage, the embodiment of the present invention welds and fixes the ammonia passage at the center of the inspection hole 201. Such a configuration can prevent the ammonia passage from falling off.

[0056] Among them, any ammonia channel includes a main ammonia channel and a branch ammonia channel, wherein the main channel is used for ammonia to enter, one end of the branch channel is arranged on the main channel, and the other end extends into the primary air powder guide tube or the air channel.

[0057] Such an arrangement allows the ammonia in the ammonia channel to enter the boiler combustion chamber more evenly, thereby further improving the combustion efficiency and reducing the generation of nitrogen oxides.

[0058] As a further embodiment, the ammonia-doped swirl burner disclosed in the embodiment of the present invention further includes at least one swirler, wherein at least one swirler is disposed in one wind channel. The gas passing through the swirler can form a swirling airflow with a tangential velocity and then enter the combustion chamber of the boiler.

[0059] The swirler has axial swirl blades, and an angle is formed between the axial swirl blades and the radial direction of the wind channel, and the angle is 30°-60°. This arrangement is more convenient for forming a swirling airflow.

[0060] The present invention is described by taking two air channels and three ammonia channels as an example. Figure 1 and Figure 3 The air channel disclosed in the embodiment of the present invention includes a secondary air channel 300 and a tertiary air channel 400 , and the ammonia channel includes a primary ammonia channel 500 , a secondary ammonia channel 600 and a tertiary ammonia channel 700 .

[0061] Among them, the primary air powder guide cylinder 200, the secondary air channel 300 and the tertiary air channel 400 are stacked in sequence from the inside to the outside, the primary air powder guide cylinder 200, the secondary air channel 300 and the tertiary air channel 400 are all connected to the boiler combustion chamber, the primary ammonia channel 500 is connected to the primary air powder guide cylinder 200, the secondary ammonia channel 600 is connected to the secondary air channel 300, and the tertiary ammonia channel 700 is connected to the tertiary air channel 400.

[0062] When the ammonia-blended swirl burner is working, air is first introduced into the secondary air channel 300, and at the same time, ammonia of a first preset ratio is introduced into the secondary ammonia channel 600. The ammonia enters the secondary air channel 300, mixes with the air in the secondary air channel 300 to form a secondary air mixed gas, and then enters the boiler combustion chamber. Then, the air carrying coal powder is introduced into the primary air powder guide tube 200, and at the same time, ammonia of a second preset ratio is introduced into the primary ammonia channel 500. The ammonia enters the primary air powder guide tube 200 and mixes with the primary air powder mixed gas. The air carrying coal powder in the secondary air powder guide tube 200 is mixed with the primary air powder mixture and then enters the boiler combustion chamber. At this time, in the boiler combustion chamber, the secondary air mixed gas and the primary air powder mixture form a main flame. Finally, air is introduced into the tertiary air channel 400. At the same time, ammonia of a third preset proportion is introduced into the tertiary ammonia channel 700. The ammonia enters the tertiary air channel 400, mixes with the air in the tertiary air channel 400 to form a tertiary air mixed gas and then enters the boiler combustion chamber to be mixed with the main flame and burnt.

[0063] Among them, the first preset ratio, the second preset ratio and the third preset ratio need to be set according to specific circumstances.

[0064] The embodiment of the present invention does not limit the specific structures of the primary ammonia channel 500, the secondary ammonia channel 600 and the tertiary ammonia channel 700. As long as the structures meet the use requirements of the present invention, they are within the protection scope of the present invention.

[0065] As one example, please refer to Figure 2The primary ammonia channel 500 disclosed in the embodiment of the present invention specifically includes a primary main channel 501 and a primary branch channel 502, wherein the primary main channel 501 is used for ammonia to enter, and one end of the primary branch channel 502 is arranged on the primary main channel 501, and the other end extends into the primary air powder guide cylinder 200.

[0066] Among them, the first-level sub-channel 502 can be one or more.

[0067] The secondary ammonia channel 600 specifically includes a secondary main channel 601 and a secondary branch channel 602, wherein the secondary main channel 601 is used for ammonia to enter, one end of the secondary branch channel 602 is connected to the secondary main channel 601, and the other end extends into the secondary air channel 300. There are at least two secondary branch channels 602.

[0068] Ammonia enters from the secondary main channel 601, flows from the secondary main channel 601 to each secondary branch channel 602, and then enters the secondary air channel 300 from the secondary branch channel 602 to mix with the air. This arrangement allows the ammonia in the secondary ammonia channel 600 to enter the combustion chamber more evenly, thereby further improving the combustion efficiency and reducing the generation of nitrogen oxides.

[0069] The embodiment of the present invention does not limit the specific structure of the tertiary ammonia channel 700. As long as the structure meets the use requirements of the present invention, it is within the protection scope of the present invention.

[0070] As one of the examples, please refer to Figure 2 The three-stage ammonia channel 700 disclosed in the embodiment of the present invention includes a three-stage main channel 701 and a three-stage branch channel 702. The three-stage main channel 701 is used for ammonia to enter. One end of the three-stage branch channel 702 is connected to the three-stage main channel 701, and the other end extends into the tertiary air channel 400, wherein there are at least two three-stage branch channels 702.

[0071] Ammonia enters from the tertiary main channel 702, flows from the tertiary main channel 701 to each tertiary branch channel 702, and then enters the tertiary air channel 400 from the tertiary branch channel 702 to mix with the air. This arrangement allows the ammonia in the tertiary ammonia channel 700 to enter the combustion chamber more evenly, thereby further improving the combustion efficiency and reducing the generation of nitrogen oxides.

[0072] Specifically, the cyclone disclosed in the embodiment of the present invention includes a first cyclone 900 and a second cyclone 1000, and the first cyclone 900 is circumferentially arranged in the secondary air channel 300 along the side wall of the secondary air channel 300, wherein the first cyclone 900 has a first preset distance from the outlet end of the secondary ammonia channel 600.

[0073] The air entering the secondary air channel 300 is first mixed with ammonia. The mixed gas of ammonia and air passes through the first cyclone 900 to form a rotating airflow with a tangential velocity, and then enters the boiler combustion chamber.

[0074] Such an arrangement allows the airflow in the secondary air channel 300 to form a rotating airflow with a tangential velocity after passing through the first cyclone 900, thereby effectively improving the mixing uniformity of the coal powder and the ammonia.

[0075] The specific structure of the first cyclone 900 in the embodiment of the present invention is not limited, and any structure that meets the use requirements of the present invention is within the protection scope of the present invention.

[0076] As one embodiment, the first cyclone 900 disclosed in the embodiment of the present invention has a first axial swirl blade, wherein a first angle is formed between the first axial swirl blade and the radial direction of the primary air powder guide tube 200, and the angle of the first angle is 30°-60°. Such a configuration is more convenient for forming a swirling airflow.

[0077] The second cyclone 1000 is disposed in the tertiary air passage 400 along the circumferential direction of the side wall of the tertiary air passage 400. The second cyclone 1000 has a second preset distance from the outlet end of the tertiary ammonia passage 700.

[0078] The air entering the tertiary air channel 400 is first mixed with ammonia, and the mixed gas of ammonia and air passes through the second cyclone 1000 to form a rotating airflow with a tangential velocity, and then enters the boiler combustion chamber.

[0079] Such an arrangement enables the airflow in the tertiary air channel 400 to form a rotating airflow with a tangential velocity after passing through the second cyclone 1000, thereby effectively improving the mixing uniformity of the coal powder and the ammonia.

[0080] The specific structure of the second cyclone 1000 in the embodiment of the present invention is not limited, and any structure that meets the use requirements of the present invention is within the protection scope of the present invention.

[0081] As a further embodiment, the second swirler 1000 disclosed in the embodiment of the present invention has a second axial swirl blade, and a second angle is formed between the second axial swirl blade and the radial direction of the secondary air channel 300, and the second angle is 30°-60°.

[0082] An embodiment of the present invention also discloses a method for adjusting the ammonia blending ratio of an ammonia blending swirl burner, which is applied to an ammonia blending swirl burner as disclosed in any of the above embodiments, and includes the following steps: first, obtaining the actual load to obtain the load ratio of the actual load to the rated load, then obtaining the ammonia blending ratio of different secondary airs according to the corresponding relationship between the load ratio and the ammonia blending ratio, and finally adjusting the ammonia blending ratio of different secondary airs according to the above ammonia blending ratio.

[0083] Since the primary air powder guide tube and at least one air channel are respectively connected to an independent ammonia channel, the amount of ammonia entering the primary air powder guide tube and the air channel can be adjusted according to needs. That is, after obtaining the actual load and the load ratio of the actual load to the rated load, the ammonia blending ratio of different secondary air is obtained according to the corresponding relationship between the load ratio and the ammonia blending ratio, and then the ammonia blending ratio of different secondary air is adjusted according to the above-mentioned ammonia blending ratio. In this way, the adjustment range of the ammonia blending ratio can be increased, which is beneficial to improving combustion efficiency and reducing the generation of nitrogen oxides, thereby meeting environmental protection requirements.

[0084] As a further embodiment, the specific adjustment method disclosed in the embodiment of the present invention includes adjusting the ammonia content of low-volatile coal and adjusting the ammonia content of high-volatile coal, wherein the volatile content of low-volatile coal is V daf <20%, the volatile content of high volatile coal is V daf ≥20%.

[0085] As a further embodiment, the ammonia blending ratio adjustment of different secondary air disclosed in the embodiment of the present invention specifically includes the ammonia blending ratio adjustment of tertiary air, namely: the ammonia blending ratio adjustment of primary air, the ammonia blending ratio adjustment of secondary air and the ammonia blending ratio adjustment of tertiary air.

[0086] Among them, when the adjustment method is to adjust the ammonia blending ratio of low volatile coal, the corresponding relationship between the load ratio and the ammonia blending ratio is:

[0087] Primary air ammonia ratio adjustment:

[0088]

[0089] Secondary air ammonia ratio adjustment:

[0090]

[0091] Tertiary air ammonia ratio adjustment:

[0092]

[0093] When the adjustment method is to adjust the ammonia blending ratio of high volatile coal, the corresponding relationship between the load ratio and the ammonia blending ratio is:

[0094] Primary air ammonia ratio adjustment:

[0095]

[0096] Secondary air ammonia ratio adjustment:

[0097]

[0098] Tertiary air ammonia ratio adjustment:

[0099]

[0100] Among them, V daf is the dry ash-free volatile matter content of coal powder, C1 is the ammonia ratio of primary air, C2 is the ammonia ratio of secondary air, C3 is the ammonia ratio of tertiary air, and D is the ratio of actual heat load of burner to rated load, all expressed in percentage.

[0101] It should be explained that C1 is specifically the ratio of the ammonia flow rate in the primary air powder guide tube 200 to the total ammonia amount in the boiler, C2 is specifically the ratio of the ammonia flow rate in the secondary air channel 300 to the total ammonia amount in the boiler, and C3 is specifically the ratio of the ammonia flow rate in the tertiary air channel 400 to the total ammonia amount in the boiler.

[0102] Specifically, for low volatile coal (V daf <20%):

[0103] 1) When 50%≤D<1, the combustion temperature of the burner is low, the ammonia ratio of the primary air powder guide tube 200 is large and gradually increases with the increase of load, and the ammonia ratio in the secondary air channel 300 and the tertiary air channel 400 gradually decreases with the increase of load.

[0104] 2) When 50%≤D<1, the ammonia content in the primary air powder guide tube 200 gradually decreases as the load increases; the ammonia content in the secondary air channel 300 and the tertiary air channel 400 gradually increases as the load increases.

[0105] For high volatile coal (V daf ≥20%):

[0106] 1) When 0<D<50%, since high-volatile coal itself is easy to ignite, the ammonia ratio in the primary air powder guide tube 200 is relatively small compared with low-volatile coal and increases slowly with the increase of load. The ammonia ratio in the secondary air channel 300 gradually increases with the increase of load, and the ammonia ratio in the tertiary air channel 400 gradually decreases with the increase of load.

[0107] 2) When 50%≤D<1, the ammonia ratio in the primary air powder guide tube 200 increases slowly with the increase of load, and the ammonia ratio in the secondary air channel 300 and the tertiary air channel 400 are both small. The ammonia ratio in the secondary air channel 300 gradually decreases with the increase of load, and the ammonia ratio in the tertiary air channel 400 gradually increases with the increase of load.

[0108] The above-mentioned ammonia-blended swirl burner is provided with primary, secondary and tertiary ammonia channels, and different proportions of ammonia can be blended into low-volatile coal and high-volatile coal respectively, thereby effectively improving the adjustment range of the ammonia blending ratio, improving combustion efficiency, reducing the generation of nitrogen oxides, and further meeting environmental protection requirements.

[0109] At 60% rated load and volatile content V daf =30% is used as an example to illustrate the specific ammonia mixing ratios of the three ammonia channels:

[0110] Primary air: C1 = -0.1 × 60% + 55% = 61%;

[0111] Secondary air: C2 = -0.2 × 60% + 35% = 23%;

[0112] Tertiary wind: C3 = 0.1 × 60% + 10% = 16%.

[0113] It should be noted that the ammonia in the primary ammonia channel 500 can be initially ignited and burned along with the primary air powder, and the ammonia in the secondary ammonia channel 600 and the tertiary ammonia channel 700 is heated by relying on the reflux of high-temperature flue gas in the furnace, forming a stable combustion process with the main flame in the furnace.

[0114] When using the above method to adjust the ammonia blending ratio, it is first necessary to gradually reduce the original coal powder supply rate and reduce the concentration of coal powder in the primary air-powder mixture. After a stable combustion process is formed, the ammonia amount in the three ammonia channels is adjusted according to the ammonia blending ratio requirements.

[0115] Moreover, the above-mentioned ammonia blending ratio adjustment method realizes the control of the ammonia blending ratio under different loads and different volatile matter contents, has little impact on the original rotating jet, blunt body reflux and other flow field organizations, does not break the original combustion organization characteristics, and does not require major changes to the original pulverized coal burner structure design and operating conditions, further reducing the difficulty of the coal-ammonia co-combustion technical transformation of pulverized coal boilers.

[0116] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0117] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0118] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An ammonia-doped swirl burner, characterized in that: It comprises a burner housing, a primary air-powder guide tube for air-powder guidance, at least one air channel for introducing air, and at least two ammonia channels for introducing ammonia; The primary air powder guide cylinder and at least one air channel are stacked in sequence from the inside to the outside, and are both connected to the boiler combustion chamber; The primary air powder guide cylinder and at least one air channel are respectively connected to one of the ammonia channels in a one-to-one correspondence.

2. The ammonia-blended swirl burner according to claim 1, characterized in that: It also includes a combustion stabilizing blunt body, which is arranged at the outlet end of the primary air powder guide tube.

3. The ammonia-doped swirl burner according to claim 1, characterized in that: The primary air powder guide cylinder is provided with an inspection hole for inserting the ammonia passage.

4. The ammonia-blended swirl burner according to claim 1, characterized in that: Any of the ammonia channels comprises a main channel and a branch channel, the main channel is used for ammonia to enter, one end of the branch channel is arranged on the main channel, and the other end extends into the primary air powder guide cylinder or the air channel.

5. The ammonia-doped swirl burner according to claim 1, characterized in that: It also includes at least one cyclone, and at least one cyclone is arranged in one of the wind passages.

6. The ammonia-doped swirl burner according to claim 5, characterized in that: The swirler has axial swirl blades, and an angle is formed between the axial swirl blades and the radial direction of the wind channel, and the angle is 30°-60°.

7. A method for adjusting the ammonia ratio of an ammonia-doped swirl burner, applied to the ammonia-doped swirl burner as claimed in any one of claims 1 to 6, characterized in that: include: Obtain the actual load and obtain the load ratio between the actual load and the rated load; According to the corresponding relationship between the load ratio and the ammonia mixing ratio, the ammonia mixing ratio of different secondary air is obtained; The ammonia blending ratio of different secondary air is adjusted accordingly according to the above-mentioned ammonia blending ratio.

8. The method for adjusting the ammonia blending ratio of the ammonia blending swirl burner according to claim 7, characterized in that: The adjustment method includes: adjusting the ammonia content of low-volatile coal and adjusting the ammonia content of high-volatile coal, wherein the volatile content of low-volatile coal is V daf <20%, the volatile matter content of the high volatile coal is V daf ≥20%.

9. The method according to claim 8, characterized in that The ammonia blending ratio adjustment of different secondary air specifically includes the ammonia blending ratio adjustment of tertiary air, which are: primary air ammonia blending ratio adjustment, secondary air ammonia blending ratio adjustment and tertiary air ammonia blending ratio adjustment.

10. The method according to claim 9, characterized in that When the adjustment method is to adjust the ammonia blending ratio of low volatile coal, the corresponding relationship between the load ratio and the ammonia blending ratio is: The primary air ammonia ratio adjustment: The secondary air ammonia ratio adjustment: The tertiary air ammonia mixing ratio adjustment: When the adjustment method is to adjust the ammonia blending ratio of high volatile coal, the corresponding relationship between the load ratio and the ammonia blending ratio is: The primary air ammonia ratio adjustment: The secondary air ammonia ratio adjustment: The tertiary air ammonia mixing ratio adjustment: Among them, V daf is the dry ash-free volatile matter content of the coal powder, C1 is the ammonia ratio of the primary air, C2 is the ammonia ratio of the secondary air, C3 is the ammonia ratio of the tertiary air, and D is the ratio of the actual heat load of the burner to the rated load.

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