A side-mixed ammonia / pulverized coal dual-fuel combustion industrial boiler

Abstract

This invention discloses a side-mixed ammonia / pulverized coal dual-fuel combustion industrial boiler, comprising a pulverized coal burner and multiple ammonia nozzles disposed on the side wall of the furnace. The pulverized coal burner is mounted on the side water-cooled wall. The ammonia nozzles are uniformly distributed in a layered structure. The vertical distance between the uppermost ammonia nozzle and the bottom of the furnace is consistent with the critical height of the primary air duct of the pulverized coal burner, and the vertical distance between the lowermost ammonia nozzle and the bottom of the furnace is consistent with the critical height of the primary air duct of the pulverized coal burner. This side-mixed ammonia / pulverized coal dual-fuel combustion industrial boiler improves the carbon emissions and nitrogen oxide emissions caused by pulverized coal industrial boilers during operation, while also mitigating the disadvantages of low ammonia laminar flame propagation speed and high nitrogen oxide emissions.

Description

Technical Field

[0001] This invention relates to the field of thermal energy and power engineering technology, and in particular to an industrial boiler with side-mixed ammonia / pulverized coal dual-fuel combustion. Background Technology

[0002] Industrial boilers are crucial thermal power equipment in my country, with a large number and wide distribution. Pulverized coal industrial boilers account for 80% of the total, consuming 21% of the country's annual coal consumption. In recent years, regional and complex air pollution caused by coal combustion has become increasingly severe in my country. Therefore, the country has fully implemented stringent ultra-low emission standards for coal-fired power plants, significantly reducing pollutant emissions from the thermal power industry. Compared to coal-fired power plants, my country's pulverized coal industrial boilers are characterized by their large number, wide distribution, small average capacity, and outdated dust removal, desulfurization, and denitrification equipment, low level of environmental protection equipment operation and management, and high pollutant emission concentrations. Therefore, developing low-pollutant emission technologies for industrial pulverized coal boilers is of great significance to China's atmospheric environmental protection.

[0003] Ammonia and hydrogen are currently the most promising carbon-free alternative fuels. Ammonia can be produced from various fossil fuels (coal, natural gas, etc.), can be manufactured using water, biomass or organic waste and air as the main materials, and can also be synthesized from renewable energy sources (solar, wind, hydropower, and geothermal, etc.) through geophysical exploration processes. Furthermore, the hydrogen density of liquid ammonia at 293 K and 8.6 bar is 108 kg H₂ / m³. 3 Ammonia has a hydrogen content of 17.7%, higher than any advanced metal hydride hydrogen storage method. Furthermore, its volumetric energy density is higher than that of liquid hydrogen, exceeding that of methanol, ethanol, and gasoline. Compared to liquid hydrogen, liquid ammonia requires less storage space, only 70% of the space needed for liquid hydrogen. Additionally, ammonia has a liquefaction temperature of 293.8 K, far exceeding hydrogen's 20 K. It also has a narrow flammability limit, a high auto-ignition temperature, and is less flammable and explosive, making it easier to store and transport. Therefore, compared to hydrogen, ammonia is more likely to replace fossil fuels and become a major source of national energy. However, compared to hydrogen, ammonia has a lower maximum laminar flame propagation speed, resulting in higher NO₂ levels during combustion. x It has high emissions, so it is not suitable for burning alone.

[0004] Co-combustion of ammonia with pulverized coal allows the small-molecule combustible gases such as H2, CH4, and CO, released from the high-temperature pyrolysis of pulverized coal, to mix with ammonia, increasing the laminar flame propagation speed of ammonia and compensating for its deficiencies in ignition and combustion stability. Furthermore, staged air combustion, in a reducing atmosphere, can reduce nitrogen oxide emissions during pulverized coal combustion. Therefore, developing a side-mixing ammonia / pulverized coal co-combustion device for industrial boilers is of great significance to my country's low-carbon energy development. Summary of the Invention

[0005] The present invention aims to at least partially solve one of the technical problems in the related art.

[0006] Therefore, embodiments of the present invention propose an industrial boiler with side-mixed ammonia / pulverized coal dual-fuel combustion.

[0007] This invention proposes a side-mixed ammonia / pulverized coal dual-fuel combustion industrial boiler, comprising:

[0008] A pulverized coal burner, wherein the pulverized coal burner is mounted on a side water-cooled wall;

[0009] Multiple ammonia nozzles are installed on the side wall of the furnace. The ammonia nozzles are evenly distributed in a layered structure. The vertical distance between the uppermost ammonia nozzle and the bottom of the furnace is the same as the upper critical height of the primary air duct of the pulverized coal burner. The vertical distance between the lowermost ammonia nozzle and the bottom of the furnace is the same as the lower critical height of the primary air duct of the pulverized coal burner.

[0010] In some embodiments, when there is only one layer of ammonia nozzles, the vertical distance between the ammonia nozzles and the bottom of the furnace is consistent with the center height of the primary air duct of the pulverized coal burner.

[0011] In some embodiments, the distance between the row of ammonia nozzles closest to the pulverized coal burner and the nozzles of the pulverized coal burner is 2.5 ± 0.3 m, and the distance between the row of ammonia nozzles furthest from the pulverized coal burner and the nozzles of the pulverized coal burner is 3.5 ± 0.3 m.

[0012] In some embodiments, the ammonia nozzle is provided with a flame-stabilizing blister and a plurality of swirl blades, the flame-stabilizing blister is located at the center of the ammonia nozzle, and the swirl blades are uniformly arranged axially within the ammonia channel.

[0013] In some embodiments, the number of swirl blades is 4 to 8, and the angle of the swirl blades is 45° to 60°.

[0014] In some embodiments, the outer diameter of the ammonia nozzle is 10-15 mm, and the ammonia nozzle extends 5-10 mm into the furnace chamber.

[0015] In some embodiments, the ammonia nozzle is connected to an ammonia storage tank via an ammonia pipeline, and an ammonia pipeline valve is provided at the inlet end of the ammonia nozzle.

[0016] In some embodiments, a plurality of pressure gauges are provided on the ammonia pipeline, the pressure gauges being used to test the total pressure of the gas flowing out of the ammonia storage tank and the pressure of the gas flowing into each of the ammonia nozzles.

[0017] In some embodiments, when six ammonia nozzles are arranged, all ammonia nozzles are located on the right side of the pulverized coal burner, divided into two layers and three columns. The first layer of ammonia nozzles, from left to right, are N1, N3, and N5. The second layer of ammonia nozzles, from left to right, are N2, N4, and N6. When the ammonia blending ratio is less than 20%, ammonia nozzles N5 and N6 are opened. When the ammonia blending ratio is between 20% and 40%, ammonia nozzles N3, N4, N5, and N6 are opened. Finally, when the ammonia blending ratio is between 40% and 60%, all ammonia nozzles are opened.

[0018] In some embodiments, when three ammonia nozzles are arranged, all ammonia nozzles are located on the right side of the pulverized coal burner, arranged in one layer and three columns, from left to right as N10, N20 and N30. When the ammonia blending ratio is less than 20%, ammonia nozzle N10 is turned on; when the ammonia blending ratio is between 20% and 40%, ammonia nozzles N10 and N20 are turned on; when the ammonia blending ratio is between 40% and 60%, ammonia nozzles N10, N20 and N30 are turned on.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] The side-mixed ammonia / pulverized coal dual-fuel combustion industrial boiler of the present invention improves the carbon emissions and nitrogen oxide emissions caused by the operation of pulverized coal industrial boilers, while also improving the disadvantages of low flame propagation speed and high nitrogen oxide emissions of ammonia laminar flow.

[0021] The ammonia nozzle configuration in this invention ensures that the ammonia injected into the side wall is within the pulverized coal flame zone, preventing the ammonia injected into the furnace from failing to be heated to the ignition point and causing a large amount of ammonia to escape. The spacing between each ammonia nozzle ensures that the co-fired ammonia fuel is evenly distributed within the pulverized coal flame zone, avoiding excessively high local concentrations, unburned ammonia, and a large amount of ammonia escape.

[0022] The ammonia nozzle of this invention is equipped with a flame-stabilizing blister and multiple swirl blades. After ammonia is injected into the furnace, due to its own swirl characteristics, an external reflux zone is generated, which entrains the high-temperature flue gas in the furnace, heats the ammonia fuel, and promotes the ignition and combustion of ammonia. The flame-stabilizing blister causes the ammonia to form an internal reflux zone when it flows through the flame-stabilizing blister. The ammonia that has been heated by the high-temperature flue gas in the furnace returns to the ammonia nozzle to preheat the ammonia fuel, which can also promote the ignition and combustion of ammonia. Attached Figure Description

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0024] Figure 1 A schematic diagram of an industrial boiler with side-mixed ammonia / pulverized coal dual-fuel combustion according to an embodiment;

[0025] Figure 2A schematic diagram of an industrial boiler with side-mixed ammonia / pulverized coal dual-fuel combustion, according to another embodiment;

[0026] Figure 3 This is a schematic diagram of an ammonia nozzle structure;

[0027] Figure 4 for Figure 1 The diagram shows the ammonia fuel supply pipeline of the embodiment shown.

[0028] Figure 5 for Figure 2 The diagram shows the ammonia fuel supply pipeline of the embodiment shown.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Pulverized coal burner, 2. Side water-cooled wall, 3. Ammonia nozzle, 4. Furnace, 5. Swirl blades, 6. Combustion stabilizer, 7. Ammonia storage tank, 8. Ammonia pipeline, 9. Pressure gauge, 10. Ammonia pipeline valve. Detailed Implementation

[0031] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. 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.

[0032] The following description, with reference to the accompanying drawings, describes an industrial boiler with side-mixed ammonia / pulverized coal dual-fuel combustion according to an embodiment of the present invention.

[0033] like Figure 1-5 As shown, the industrial boiler with side-mixed ammonia / pulverized coal dual-fuel combustion of the present invention includes a pulverized coal burner 1, a side water-cooled wall 2, a furnace 4, and a plurality of ammonia nozzles 3, wherein the pulverized coal burner 1 is disposed on the side water-cooled wall 2, and the plurality of ammonia nozzles 3 are disposed on the side wall of the furnace 4.

[0034] The ammonia nozzles 3 are evenly distributed in a layered structure. The vertical distance between the uppermost ammonia nozzle 3 and the bottom of the furnace 4 is consistent with the critical height of the primary air duct of the pulverized coal burner 1. The vertical distance between the lowermost ammonia nozzle 3 and the bottom of the furnace 4 is consistent with the critical height of the primary air duct of the pulverized coal burner 1. The distance between the row of ammonia nozzles 3 closest to the pulverized coal burner 1 and the nozzle of the pulverized coal burner 1 is 2.5 ± 0.3 m, and the distance between the row of ammonia nozzles 3 furthest from the pulverized coal burner 1 and the nozzle of the pulverized coal burner 1 is 3.5 ± 0.3 m. When there is only one layer of ammonia nozzles 3, the vertical distance between the ammonia nozzles 3 and the bottom of the furnace 4 is consistent with the center height of the primary air duct of the pulverized coal burner 1.

[0035] Specifically, multiple ammonia nozzles 3 are evenly spaced on the sidewall of the furnace 4 in a multi-layer, multi-row structure. The vertical distance between the uppermost ammonia nozzle 3 in the multi-layer, multi-row structure and the bottom of the furnace 4 is consistent with the critical height of the primary air duct of the pulverized coal burner 1. The vertical distance between the lowermost ammonia nozzle 3 in the multi-layer, multi-row structure and the bottom of the furnace 4 is consistent with the critical height of the primary air duct of the pulverized coal burner 1. All ammonia nozzles 3 are located on the right side of the pulverized coal burner 1. The distance between the nearest row of ammonia nozzles 3 and the nozzle of the pulverized coal burner 1 is 2.5 ± 0.3 m, and the distance between the farthest row of ammonia nozzles 3 and the nozzle of the pulverized coal burner 1 is 3.5 ± 0.3 m. Alternatively, when there is only one layer of ammonia nozzles 3, i.e., the ammonia nozzles 3 are distributed in a multi-layer, multi-row structure, the vertical distance between the ammonia nozzle 3 and the bottom of the furnace 4 is consistent with the center height of the primary air duct of the pulverized coal burner 1. The purpose of this ammonia nozzle 3 configuration is to ensure that the ammonia injected into the side wall is within the pulverized coal flame zone, preventing the ammonia injected into the furnace from failing to reach its ignition point and causing a large amount of ammonia to escape. In addition, the spacing between each ammonia nozzle 3 ensures that the co-fired ammonia fuel is evenly distributed within the pulverized coal flame zone, avoiding excessively high local concentrations, unburned ammonia, and large amounts of ammonia escape.

[0036] The ammonia nozzle 3 is equipped with a combustion-stabilizing bluff body 6 and multiple swirl blades 5. The combustion-stabilizing bluff body 6 is located at the center of the ammonia nozzle 3, and the swirl blades 5 are evenly distributed axially within the ammonia channel. The number of swirl blades 5 is 4-8, and the angle of the swirl blades 5 is 45°-60°. After flowing through the swirl blades 5 in the ammonia pipe 8, the ammonia acquires a tangential velocity, enhancing its own turbulence. After being injected into the furnace, the ammonia, due to its swirling characteristics, generates an external recirculation zone, entraining the high-temperature flue gas in the furnace, heating the ammonia fuel, and promoting the ignition and combustion of ammonia. Simultaneously, the low oxygen content in the high-temperature flue gas ensures that the ammonia injected into the furnace is in a reducing atmosphere before ignition, preventing the ammonia from being oxidized and producing large amounts of nitrogen oxides. Furthermore, the combustion-stabilizing bluff body 6 installed at the center of the ammonia nozzle 3 forms an internal recirculation zone as the ammonia flows through it. The ammonia, heated by the high-temperature flue gas in the furnace, returns to the ammonia nozzle 3, preheating the ammonia fuel and similarly promoting the ignition and combustion of ammonia.

[0037] The ammonia nozzle 3 extends 5-10 mm into the furnace 4. The inner diameter of the ammonia nozzle 3 is 2 mm, and its outer diameter is 10-15 mm. After flowing through the swirl vanes 5 within the ammonia pipe 8, the ammonia exhibits tangential velocity. This tangential velocity enhances the turbulence of the ammonia flow, allowing it to mix thoroughly and rapidly with the pulverized coal after being injected into the furnace 4. After mixing with the pulverized coal, the CH4, CO, and H2 produced by the pyrolysis of the pulverized coal enhance the ignition and combustion of the ammonia, preventing large-scale ammonia leakage. Simultaneously, the ignition of the pulverized coal generates a large amount of H2. O and OH Free radicals also facilitate the ignition and combustion of ammonia. On the other hand, when ammonia is mixed with pulverized coal, it can undergo a homogeneous reaction with the nitrogen oxides produced by the combustion of pulverized coal, converting them into nitrogen gas and avoiding large-scale emissions of nitrogen oxides.

[0038] The ammonia fuel supply system includes an ammonia storage tank 7, ammonia pipelines 8, pressure gauges 9, and ammonia pipeline valves 10. Ammonia nozzles 3 are connected to the ammonia storage tank 7 via ammonia pipelines 8, and an ammonia pipeline valve 10 is installed at the inlet end of the ammonia nozzles 3. Multiple pressure gauges 9 are installed on the ammonia pipelines 8 to test the total pressure of the gas flowing out of the ammonia storage tank 7 and the pressure of the gas flowing into each ammonia nozzle 3. All components involved in the ammonia fuel supply system are made of stainless steel to prevent corrosion of the ammonia storage tank 7 and ammonia pipelines 8.

[0039] When six ammonia nozzles 3 are arranged, all ammonia nozzles 3 are located on the right side of the pulverized coal burner 1, divided into two layers and three columns. The first layer of ammonia nozzles 3, from left to right, are N1, N3, and N5. The second layer of ammonia nozzles 3, from left to right, are N2, N4, and N6. When the ammonia blending ratio is less than 20%, ammonia nozzles N5 and N6 are opened. When the ammonia blending ratio is between 20% and 40%, ammonia nozzles N3, N4, N5, and N6 are opened. Finally, when the ammonia blending ratio is between 40% and 60%, all ammonia nozzles 3 are opened.

[0040] Specifically, such as Figure 1 and Figure 4As shown, a total of 6 ammonia nozzles 3 are installed on the side wall of the furnace 4. All 6 ammonia nozzles 3 are located on the right side of the pulverized coal burner 1, arranged in 2 layers and 3 columns. The first layer of ammonia nozzles 3, from left to right, are N1, N3, and N5; the second layer of ammonia nozzles 3, from left to right, are N2, N4, and N6. The vertical distance H1 between the first layer of ammonia nozzles 3 and the bottom of the furnace 4 is the same as the critical height of the primary air duct of the pulverized coal burner 1. The vertical distance H2 between the second layer of ammonia nozzles 3 and the bottom of the furnace 4 is the same as the critical height of the primary air duct of the pulverized coal burner 1. The ammonia nozzles in the first row 3 are numbered N1 and N2 from top to bottom, the second row 3 are numbered N3 and N4 from top to bottom, and the third row 3 are numbered N5 and N6 from top to bottom. The first row of ammonia nozzles 3 is closest to the pulverized coal burner 1, while the third row is furthest away. The distance L1 between the first row of ammonia nozzles 3 and the nozzles of the pulverized coal burner 1 is 2.5 ± 0.3 m, and the distance L2 between the third row of ammonia nozzles 3 and the nozzles of the pulverized coal burner 1 is 3.5 ± 0.3 m. Each ammonia nozzle 3 has a pressure gauge 9 and an ammonia pipeline valve 10 installed on its inlet pipeline. The pressure gauge 9 is used to test the gas pressure flowing into the corresponding ammonia nozzle 3, and the ammonia pipeline valve 10 is used to control the opening and closing of the corresponding ammonia nozzle 3. A pressure gauge 9 is installed on the ammonia pipeline 8 at the outlet end of the ammonia storage tank 7 to test the total pressure of the gas flowing out of the ammonia storage tank 7. During co-firing, when the ammonia co-firing ratio is below 20%, ammonia nozzles N5 and N6 are opened; when the ammonia co-firing ratio is between 20% and 40%, ammonia nozzles N3, N4, N5, and N6 are opened; finally, when the ammonia co-firing ratio is between 40% and 60%, all ammonia nozzles 3 are opened.

[0041] When three ammonia nozzles 3 are arranged, all three nozzles are located on the right side of the pulverized coal burner 1, arranged in one layer and three columns, from left to right as N10, N20 and N30. When the ammonia blending ratio is less than 20%, ammonia nozzle N10 is turned on; when the ammonia blending ratio is between 20% and 40%, ammonia nozzles N10 and N20 are turned on; when the ammonia blending ratio is between 40% and 60%, ammonia nozzles N10, N20 and N30 are turned on.

[0042] Specifically, such as Figure 2 and Figure 5As shown, three ammonia nozzles 3 are arranged on the side wall of the furnace 4. All three ammonia nozzles 3 are located on the right side of the pulverized coal burner 1. The three ammonia nozzles are arranged in a single layer and three columns. The ammonia nozzles 3 are N10, N20 and N30 from left to right. The height H3 of the ammonia nozzles 3 and the bottom of the furnace 4 is the same as the center height of the primary air duct of the pulverized coal burner 1. The first column of ammonia nozzles 3 is N102, the second column is N20 and the third column is N30. The first column of ammonia nozzles is closest to the pulverized coal burner 1 and the third column is farthest from the pulverized coal burner 1. The distance between the first column of ammonia nozzles 3 and the nozzle of the pulverized coal burner 1 is 2.5±0.3m and the distance between the third column of ammonia nozzles 3 and the nozzle of the pulverized coal burner 1 is 3.5±0.3m. A pressure gauge 9 and an ammonia pipeline valve 10 are installed on the inlet pipelines of N10, N20, and N30. The pressure gauge 9 is used to test the gas pressure flowing into the corresponding ammonia nozzle 3, and the ammonia pipeline valve 10 is used to control the opening and closing of the corresponding ammonia nozzle 3. A pressure gauge 9 is installed on the ammonia pipeline 8 at the outlet end of the ammonia storage tank 7 to test the total pressure of the gas flowing out of the ammonia storage tank 7. During blending, when the ammonia blending ratio is between 20% and 40%, ammonia nozzles N10 and N20 are open; when the ammonia blending ratio is between 40% and 60%, ammonia nozzles N10, N20, and N30 are open.

[0043] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms may refer to different embodiments or examples. 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.

[0044] 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.

[0045] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A side-mixing ammonia / pulverized coal dual-fuel combustion industrial boiler, characterized in that, include: A pulverized coal burner, wherein the pulverized coal burner is mounted on a side water-cooled wall; Multiple ammonia nozzles are installed on the sidewall of the furnace, and the ammonia nozzles are evenly distributed in a layered structure. The vertical distance between the uppermost ammonia nozzle and the bottom of the furnace is consistent with the critical height of the primary air duct of the pulverized coal burner. The vertical distance between the lowermost ammonia nozzle and the bottom of the furnace is consistent with the critical height of the primary air duct of the pulverized coal burner. When there is only one layer of ammonia nozzles, the vertical distance between the ammonia nozzle and the bottom of the furnace is consistent with the center height of the primary air duct of the pulverized coal burner. The distance between the row of ammonia nozzles closest to the pulverized coal burner and the nozzles of the pulverized coal burner is 2.5 ± 0.3 m, and the distance between the row of ammonia nozzles furthest from the pulverized coal burner and the nozzles of the pulverized coal burner is 3.5 ± 0.3 m. The ammonia nozzle is provided with a flame-stabilizing blister and multiple swirl blades. The flame-stabilizing blister is located at the center of the ammonia nozzle, and the swirl blades are uniformly arranged axially within the ammonia channel.

2. The industrial boiler as described in claim 1, characterized in that, The number of swirl blades is 4 to 8, and the angle of the swirl blades is 45° to 60°.

3. The industrial boiler as described in claim 1, characterized in that, The outer diameter of the ammonia nozzle is 10-15 mm, and the ammonia nozzle extends 5-10 mm into the furnace chamber.

4. The industrial boiler as described in claim 1, characterized in that, The ammonia nozzle is connected to the ammonia storage tank via an ammonia pipeline, and an ammonia pipeline valve is installed at the inlet end of the ammonia nozzle.

5. The industrial boiler as described in claim 4, characterized in that, Multiple pressure gauges are installed on the ammonia pipeline. These pressure gauges are used to test the total pressure of the gas flowing out of the ammonia storage tank and the pressure of the gas flowing into each of the ammonia nozzles.

6. The industrial boiler as described in claim 1, characterized in that, When six ammonia nozzles are arranged, all ammonia nozzles are located on the right side of the pulverized coal burner, divided into two layers and three columns. The first layer of ammonia nozzles, from left to right, are N1, N3, and N5. The second layer of ammonia nozzles, from left to right, are N2, N4, and N6. When the ammonia blending ratio is less than 20%, ammonia nozzles N5 and N6 are opened. When the ammonia blending ratio is between 20% and 40%, ammonia nozzles N3, N4, N5, and N6 are opened. Finally, when the ammonia blending ratio is between 40% and 60%, all ammonia nozzles are opened.

7. The industrial boiler as described in claim 1, characterized in that, When three ammonia nozzles are arranged, all ammonia nozzles are located on the right side of the pulverized coal burner, arranged in one layer and three columns, from left to right as N10, N20 and N30. When the ammonia blending ratio is less than 20%, ammonia nozzle N10 is turned on; when the ammonia blending ratio is between 20% and 40%, ammonia nozzles N10 and N20 are turned on; when the ammonia blending ratio is between 40% and 60%, ammonia nozzles N10, N20 and N30 are turned on.

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