A low-temperature, low-nitrogen, green ammonia-coal composite combustion system for large wall-mounted tangentially-circular boilers

Abstract

The present invention discloses a low-temperature, low-nitrogen green ammonia coal composite combustion system for a large wall-type tangential boiler, wherein one end of the green ammonia pipe of the green ammonia burner nozzle is connected to the output end of the green ammonia synthesis device, and the other end is connected to the input ends of two green ammonia speed reduction and pressure boosting devices respectively through an introduction pipeline, and a valve is provided on the green ammonia pipe; the green ammonia speed reduction and pressure boosting device is a box structure, and a green ammonia nozzle is fixedly connected to the end face of the output end; the channel between the two green ammonia speed reduction and pressure boosting devices is a combustion-supporting air channel; the outer shell, the peripheral wind partition wall, and the venturi tube wall are sequentially arranged from the outside to the inside, and the green ammonia speed reduction and pressure boosting device is fixedly connected to the inner side of the venturi tube wall near the output end; the cavity between the peripheral wind partition wall and the outer shell serves as the peripheral wind channel; the cavity between the venturi tube wall and the peripheral wind partition wall serves as the air distribution channel. The present invention can achieve low-temperature, low-nitrogen, quasi-homogeneous combustion, and reduce NO x Emissions.

Description

Technical Field

[0001] The present invention relates to the field of large boiler combustion, and in particular to a low-temperature, low-nitrogen, green ammonia-coal composite combustion system for a large wall-type tangentially-circular boiler. Background Art

[0002] Ammonia-coal blending is a technological solution that efficiently combines renewable, zero-carbon energy with traditional utilization methods. It is a key path to gradually decarbonizing national economies and livelihoods, such as low-carbon power generation and clean heating. However, existing large-scale, wall-mounted, tangentially pulverized coal boilers simply inject ammonia and pulverized coal into the furnace. High-ammonia blending poses key technical bottlenecks, such as rate mismatch and significant variability in NOx generation, which severely restricts its large-scale development. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the present invention proposes a low-temperature, low-nitrogen, green ammonia coal composite combustion system for a large wall-type tangential circle boiler.

[0004] The specific technical solutions are as follows:

[0005] A green ammonia burner nozzle, the output end of which outputs green ammonia to the boiler combustion zone, comprises: a green ammonia nozzle, an air distribution nozzle, a green ammonia speed reduction and pressure boosting device, a combustion-supporting air channel, an inlet pipe, a venturi tube, a green ammonia pipe, a valve, a green ammonia synthesis device, a shell, and a perimeter wind partition wall;

[0006] One end of the green ammonia pipe is connected to the output end of the green ammonia synthesis unit, and the other end is connected to the input ends of two green ammonia deceleration and boosting units through an inlet pipe. A valve is provided on the green ammonia pipe. The green ammonia deceleration and boosting unit is a box-shaped structure with a guide plate arranged inside. A green ammonia nozzle is fixedly connected to the end face of the output end. The green ammonia nozzle is a plate with multiple regular through-holes. The passage between the two green ammonia deceleration and boosting units is the combustion air passage.

[0007] The outer shell, peripheral wind partition wall, and Venturi tube wall are arranged in sequence from the outside to the inside, and the green ammonia speed reduction and pressurization device is fixedly connected to the inner side of the Venturi tube wall near the output end; the cavity between the peripheral wind partition wall and the outer shell serves as the peripheral wind channel; one end of the Venturi tube wall is flush with the output end of the green ammonia nozzle, and the other end is inclined toward the outer shell, and the cavity between it and the peripheral wind partition wall serves as the air distribution channel.

[0008] Furthermore, an air damper is provided in the air distribution channel for adjusting the air volume and wind speed.

[0009] Furthermore, it also includes a wind speed measuring device, which is arranged in the air distribution channel and is used to measure the hot air volume.

[0010] A low-temperature, low-nitrogen, green ammonia-coal composite combustion system for a large wall-mounted tangentially-shaped boiler comprises four groups arranged along the boiler, each group comprising a separate overfire air burner and at least one green ammonia-coal composite burner; the four groups of separate overfire air burners are arranged in four corners or four walls, and the green ammonia-coal composite burners are arranged in four walls;

[0011] The green ammonia coal composite burner includes, in order: an upper hot air nozzle, a first low-nitrogen burner, a first green ammonia burner nozzle, a second low-nitrogen burner, an intermediate hot air nozzle, a first plasma or micro-oil ignition burner nozzle, a second green ammonia burner nozzle, a second plasma or micro-oil ignition burner nozzle, and a lower hot air nozzle;

[0012] The two low-nitrogen burners and the two plasma or micro-oil ignition burner nozzles are all pulverized coal combustion devices. The green ammonia burner nozzle is used to deliver green ammonia and hot air into the boiler combustion zone. The pulverized coal combustion device is used to deliver pulverized coal and primary hot air into the boiler combustion zone. The two plasma or micro-oil ignition burner nozzles are also used for ignition; the upper hot air nozzle, the middle hot air nozzle, and the lower hot air nozzle are used to supplement secondary hot air to the boiler combustion zone.

[0013] Furthermore, air dampers are respectively provided in the upper hot air nozzle, the middle hot air nozzle and the lower hot air nozzle to adjust the air volume and air speed of the secondary hot air.

[0014] Furthermore, a flame monitoring device is provided in the combustion system, and the detection results are fed back to the control system to adjust the combustion conditions in real time; the control system includes a programmable logic controller and a distributed control system.

[0015] The beneficial effects of the present invention are:

[0016] The system of the present invention can be equipped with the ability to burn more than 10% green ammonia, and the coal consumption and carbon emission levels are significantly reduced; the system of the present invention adopts a wall-type arrangement, with a higher furnace fullness, a wider and more uniform flame, and can achieve low-temperature, low-nitrogen, quasi-homogeneous combustion, NO x Lower emissions and better environmental protection characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the structure of the green ammonia burner nozzle provided in an embodiment of the present invention, wherein (a) is a left view and (b) is a front view.

[0018] Figure 2 It is a schematic diagram of the overall structure of a low-temperature, low-nitrogen, green ammonia-coal composite combustion system for a large wall-type tangential circle boiler provided by an embodiment of the present invention.

[0019] Figure 3 yes Figure 2Schematic diagram of the structure of the medium-separated ember wind device, where (a) is the main view of a single separated ember wind device, and (b) is a cross-sectional view of the layer where the separated ember wind device is located when the system is divided into four groups and arranged along the furnace.

[0020] Figure 4 yes Figure 2 Schematic diagram of the structure of the medium green ammonia coal composite burner, where (a) is the main view, (b) is a cross-sectional view of the layer where the green ammonia burner nozzle is located when the system is divided into four groups and arranged along the furnace, and (c) is a cross-sectional view of the layer where the low nitrogen burner is located when the system is divided into four groups and arranged along the furnace.

[0021] In the figure, a green ammonia burner nozzle 1, a green ammonia nozzle 1-1, an air distribution channel 1-2, a green ammonia speed reduction and pressure boosting device 1-3, a combustion-supporting air channel 1-4, an inlet pipe 1-5, a venturi tube 1-6, a green ammonia pipe 1-7, a valve 1-8, a green ammonia synthesis device 1-9, a housing 1-10, a perimeter wind partition wall 1-11, and a wind speed measuring device 1-12;

[0022] Separate overburnt air burner 2, green ammonia coal composite burner 3, upper hot air nozzle 3-1, low nitrogen burner 3-2, middle hot air nozzle 3-3, plasma or micro-oil ignition burner nozzle 3-4, lower hot air nozzle 3-5. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below based on the accompanying drawings and preferred embodiments. The purpose and effects of the present invention will become more apparent. The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0024] Before further describing the embodiments of the present invention in detail, the nouns and terms involved in the embodiments of the present invention are explained. The nouns and terms involved in the embodiments of the present invention are subject to the following explanations.

[0025] (1) Green hydrogen refers to hydrogen produced by decomposing water using renewable energy (such as wind and solar energy). Because it does not produce carbon dioxide during the production process, achieving zero carbon dioxide emissions from the source, it is considered one of the clean energy sources with the greatest development potential.

[0026] (2) Green ammonia refers to ammonia that is directly synthesized at room temperature and pressure using air and water as raw materials, driven by renewable energy. Unlike traditional ammonia production methods, the production process of green ammonia does not rely on fossil energy. It is essentially a zero-carbon fuel that only produces nitrogen and water after combustion, and no carbon dioxide.

[0027] (3) Low nitrogen burner is a kind of burner that is used to reduce nitrogen oxides (NO x) emissions and optimize the combustion process. By adjusting the mixing ratio, speed and temperature of primary air and pulverized coal, uniform combustion of pulverized coal is achieved, which helps to reduce local high temperature areas during the combustion process, thereby reducing NO x The generation of NO is suppressed by adopting specific burner structure and air flow regulation mode, such as staged combustion and air staging, to reduce the oxygen concentration during the combustion process. x Generation.

[0028] (4) Plasma or micro-oil ignition burners are two different types of ignition burners commonly used in this field. Among them, the plasma ignition burner is a coal powder burner equipped with a plasma generator and uses plasma for ignition and stable combustion. It has a fast ignition speed and a high flame temperature. It is more suitable for those coal types that are difficult to ignite and have poor stable combustion performance, as well as occasions that require high temperature and high energy characteristics; the micro-oil ignition burner is a burner that uses a small amount of fuel oil or gas to ignite the coal powder airflow. It is more suitable for boilers that need frequent startup and shutdown and occasions with strict requirements on oil consumption. Both types of ignition burners have strong adaptability to coal types and can ignite various types of coal powder airflows.

[0029] (5) Separated Over Fire Air (SOFA), also known as overfire air, is a burner used to improve combustion efficiency and reduce nitrogen oxides (NO x There is a distance between the SOFA device and the main burner, which makes the NO generated in the main burner area x In a reducing atmosphere, it is reduced to nitrogen (N2). This reaction process is relatively slow and requires sufficient time to complete. After this distance, SOFA air is added to achieve complete combustion of the remaining fuel. In addition, SOFA air can also reduce the NO at the furnace outlet. x and the deviation of flue gas temperature, which is achieved through cyclone elimination technology, which can reduce the four-corner tangential circle deviation.

[0030] Based on the above architecture, the embodiment of the present invention proposes a green ammonia burner nozzle, such as Figure 1 As shown, the green ammonia burner nozzle 1 includes: a green ammonia nozzle 1-1, an air distribution channel 1-2, a green ammonia speed reduction and pressure boosting device 1-3, a combustion-supporting air channel 1-4, an inlet pipe 1-5, a venturi tube wall 1-6, a green ammonia pipe 1-7, a valve 1-8, a green ammonia synthesis device 1-9, a housing 1-10, a perimeter wind partition wall 1-11, and an air velocity measuring device 1-12. The green ammonia nozzle 1-1 is made of wear-resistant and high-temperature resistant silicon carbide.

[0031] Green ammonia synthesis unit 1-9 converts input green hydrogen into environmentally friendly green ammonia. The output of green ammonia synthesis unit 1-9 is connected to the input of green ammonia deceleration and pressure boosting unit 1-3 via green ammonia pipe 1-7. Valve 1-8 is installed on green ammonia pipe 1-7 to control the green ammonia flow rate. If multiple green ammonia deceleration and pressure boosting units 1-3 are used, flow diversion is achieved via inlet pipe 1-5 when green ammonia pipe 1-7 is connected to these units. Green ammonia synthesis unit 1-9 is typically located outside the burner and connected to the burner interior via green ammonia pipe 1-7.

[0032] The green ammonia deceleration and pressure-boosting device 1-3 is a box-shaped structure with a green ammonia nozzle 1-1 fixedly attached to its output end. The green ammonia nozzle 1-1 is a plate with multiple regular through-holes. A guide plate is positioned within the green ammonia deceleration and pressure-boosting device 1-3 to ensure a more even distribution of the green ammonia entering the nozzle 1-1, allowing it to pass through the nozzle 1-1 and enter the boiler's combustion zone more evenly. The placement of the green ammonia nozzle 1-1 reduces the flow rate of the green ammonia and increases the pressure within the green ammonia deceleration and pressure-boosting device 1-3, helping the green ammonia enter the boiler's combustion zone at an appropriate rate.

[0033] In this embodiment, the green ammonia speed reduction and pressure boosting devices 1-3 are symmetrically arranged along the central axis of the green ammonia burner nozzle 1, and there is a distance between the two green ammonia speed reduction and pressure boosting devices 1-3. The central channel serves as the combustion-supporting air channel 1-4, which is used to provide initial air supply for green ammonia combustion.

[0034] The outer shell 1-10, the peripheral wind partition wall 1-11, and the venturi tube wall 1-6 are sequentially arranged from the outside to the inside (the present embodiment adopts a coaxial sleeve arrangement), the axial length of the venturi tube wall 1-6 is smaller than the axial length of the outer shell 1-10, the axial length of the peripheral wind partition wall 1-11 is smaller than the axial length of the venturi tube wall 1-6, and one end of the outer shell 1-10, the peripheral wind partition wall 1-11, and the venturi tube wall 1-6 are all flush with the output end of the green ammonia nozzle 1-1; the green ammonia speed reduction and pressurization device 1-3 is fixedly connected to the inner side of the venturi tube wall 1-6 near the output end.

[0035] The cavity between the peripheral wind partition wall 1-11 and the outer shell 1-10 serves as a peripheral wind channel, and the peripheral wind output from the peripheral wind channel is used to protect the green ammonia combustion burner 1 to prevent it from being damaged by the flame; and the spacing of the peripheral wind channels is moderate, neither losing the protection effect due to being too small nor affecting the flame intensity in the boiler combustion area due to being too large.

[0036] One end of the Venturi tube wall 1-6 is flush with the output of the green ammonia nozzle 1-1, while the other end is angled toward the housing 1-10. This serves to guide the wind, focusing the majority of the wind toward the central combustion-supporting air channel 1-4. The cavity between the Venturi tube wall 1-6 and the peripheral wind partition 1-11 constitutes the air distribution channel 1-2, which assists in distributing air to the combustion-supporting air channel 1-4. The air volume and speed of the air distribution channel 1-2 can be adjusted using a damper. A wind speed measuring device 1-12 is located within the air distribution channel 1-2 to monitor the hot air volume.

[0037] In practical applications, surplus electricity from renewable energy sources such as wind and solar power is used to produce green hydrogen through water electrolysis (or other methods). The resulting green hydrogen is fed into a green ammonia synthesis unit 1-9. The resulting green ammonia is transported through a green ammonia pipe 1-7 and introduced through an inlet pipe 1-5 into two green ammonia deceleration and pressure-increasing units 1-3, where the ammonia velocity is reduced to 1-8 m / s and pressurized. The green ammonia deceleration and pressure-increasing units 1-3 and the green ammonia nozzle 1-1 work together to deliver the green ammonia into the boiler combustion zone at a velocity of 9-160 m / s and a predetermined angle (2-25°).

[0038] Based on the above green ammonia burner nozzle 1, this embodiment also proposes a large wall-type tangential boiler low-temperature low-nitrogen green ammonia coal composite combustion system, which includes four groups arranged along the boiler furnace, such as Figure 2 As shown, each group includes a separate overfire air burner 2 and at least one green ammonia coal composite burner 3 (two green ammonia coal composite burners 3 are provided in this embodiment).

[0039] like Figure 3 As shown, when four groups are arranged along the boiler furnace, the four groups of separate overburnt air burners 2 are arranged at four corners or four walls (a four-corner arrangement is adopted in this embodiment), and the separate overburnt air burners 2 output at the same inclination angle, and their output forms a tangential circle in the center of the boiler combustion area, which can reduce the four-corner tangential circle deviation.

[0040] like Figure 4 As shown, the green ammonia coal composite burner 3 includes, in order: an upper hot air nozzle 3-1, a first low-nitrogen burner 3-2, a first green ammonia burner nozzle 1, a second low-nitrogen burner 3-2, an intermediate hot air nozzle 3-3, a first plasma or micro-oil ignition burner nozzle 3-4, a second green ammonia burner nozzle 1, a second plasma or micro-oil ignition burner nozzle 3-4, and a lower hot air nozzle 3-5.

[0041] The two low-nitrogen burners 3-2 and the two plasma or low-oil ignition burner nozzles 3-4 are all pulverized coal combustion devices. The green ammonia burner nozzle 1 is used to deliver green ammonia and hot air into the boiler combustion zone. The pulverized coal combustion device is used to deliver pulverized coal and primary hot air into the boiler combustion zone. The pulverized coal is introduced from the coal mill. The two plasma or low-oil ignition burner nozzles 3-4 are also used for ignition. The upper hot air nozzle 3-1, the middle hot air nozzle 3-3, and the lower hot air nozzle 3-5 are used to supply secondary hot air to the boiler combustion zone.

[0042] When four groups are arranged along the boiler furnace, the four groups of green ammonia coal composite burners 3 are arranged in four walls, such as Figure 4 As shown in (b), the four green ammonia burners on the same layer output at the same angle. The combustion-supporting air and green ammonia they output form a vortex in the center of the boiler combustion area, and after being ignited, a spiral rising flame is formed. Correspondingly, as Figure 4 As shown in (c), the outputs of the four low-nitrogen burners 3-2 located on the same layer form a vortex in the center of the boiler combustion area, and after being ignited, a spiral rising flame is formed.

[0043] In practice, primary hot air is delivered to the boiler's combustion zone via a pulverized coal combustion device. Secondary hot air is delivered to the boiler's combustion zone as supplementary hot air via the green ammonia burner nozzle 1, upper hot air nozzle 3-1, middle hot air nozzle 3-3, and lower hot air nozzle 3-5. The volume and velocity of the secondary hot air can be adjusted via dampers, achieving two-stage air distribution. The low-temperature, low-nitrogen green ammonia coal composite combustion system for large wall-mounted tangentially heated boilers utilizes controlled ignition from the plasma or micro-oil ignition burner nozzles 3-4.

[0044] After the green ammonia enters the boiler combustion zone, the flue gas generated by the upstream and surrounding pulverized coal and green ammonia combustion is sucked in, which increases the ignition heat for the green ammonia combustion. The total excess air coefficient in the main combustion zone is equal to or less than 1 (in the range of 0.6 to 1 in this embodiment), and the entire furnace forms a large combustion flame with flue gas continuously spiraling upward, thereby achieving a state of local low-temperature combustion and quasi-homogeneous combustion of the flame, ultimately achieving the purpose of reducing the generation of fuel nitrogen during green ammonia combustion.

[0045] Furthermore, there is a certain requirement for the distance between the center of the separate ember-burning air device 2 and the uppermost pulverized coal combustion device to ensure that the green ammonia and pulverized coal can be burned completely at the same time with low nitrogen. In this embodiment, the distance from the center of the separate ember-burning air device 2 to the low nitrogen burner 3-2 located relatively at the uppermost layer of the first green ammonia-coal composite burner 3 is ( Figure 1 L1) in the figure is the burning height.

[0046] The system is also equipped with an online monitoring system. An air velocity measuring device 1-12 is installed in the air distribution channel 1-2 of the green ammonia burner nozzle 1. The measurement results are transmitted to the control terminal, which can be a programmable logic controller (PLC), a distributed control system (DCS), or other control system. The control terminal controls the opening of valves 1-8 based on the feedback results, thereby adjusting the output air volume of the green ammonia burner nozzle 1. A flame monitoring device is installed in the combustion system to monitor the ammonia and coal combustion flames online. The combustion conditions are adjusted online and in real time through the PLC, DCS, or other control systems to meet the requirements for safe production, low pollution emissions, and user parameters for various boiler outputs. The operation is simple and effective.

[0047] For large wall-type tangential boilers, the amount of smoke (heat) entrained in the early stage of combustion, the mixing of fuel and hot air have a great impact, while the turbulence intensity of the entire furnace combustion area has a great impact in the late stage of combustion. The present invention adjusts the green ammonia jet velocity by controlling the mixing of green ammonia and hot air in two dimensions: space (where to ignite) and time (at what stage to ignite), and adjusting the jet hole area of ​​the jet assembly of the green ammonia burner nozzle and the two types of pulverized coal burner nozzle, thereby changing the jet rigidity; changing the jet angle of the jet assembly to adjust the combustion position, and finally achieving the control of the flame tangential circle size formed by green ammonia combustion and the flame tangential circle size formed by pulverized coal combustion, so as to promote rapid ignition, low-temperature combustion and stable combustion of ammonia and coal composite fuel, thereby achieving the purpose of homogeneous combustion of green ammonia and coal, and reducing NO x The generated concentration.

[0048] The purpose of this invention is to make better use of ammonia, an ideal energy source, and propose a large-scale wall-type tangentially-shaped boiler with low-temperature and low-nitrogen green ammonia-coal composite combustion system. The system uses surplus electricity from renewable energy sources such as wind power and solar power generation to produce green hydrogen and synthesize green ammonia through water electrolysis (or other methods). The green ammonia is then mixed with coal to achieve green ammonia-coal composite combustion in the boiler, reducing NO x Generation.

[0049] Those skilled in the art will understand that the foregoing descriptions are merely preferred embodiments of the invention and are not intended to limit the invention. Although the invention has been described in detail with reference to the foregoing examples, those skilled in the art will still be able to modify the technical solutions described in the foregoing examples or substitute equivalents for some of the technical features therein. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the invention shall be included within the scope of protection of the invention.

Claims

1. A large wall-type tangentially fired boiler low-temperature, low-nitrogen, green ammonia coal composite combustion system, characterized in that: It includes four groups arranged along the boiler, each group includes a separate overfire air burner and at least one green ammonia coal composite burner; the four groups of separate overfire air burners are arranged in four corners or four walls, and the green ammonia coal composite burners are arranged in four walls; The green ammonia coal composite burner includes, in order: an upper hot air nozzle, a first low-nitrogen burner, a first green ammonia burner nozzle, a second low-nitrogen burner, an intermediate hot air nozzle, a first plasma or micro-oil ignition burner nozzle, a second green ammonia burner nozzle, a second plasma or micro-oil ignition burner nozzle, and a lower hot air nozzle; The green ammonia burner nozzle, whose output end outputs green ammonia to the boiler combustion zone, includes: a green ammonia nozzle, an air distribution nozzle, a green ammonia speed reduction and pressure boosting device, a combustion-supporting air channel, an introduction pipeline, a venturi tube, a green ammonia pipe, a valve, a green ammonia synthesis device, a shell, and a perimeter wind partition wall; One end of the green ammonia pipe is connected to the output end of the green ammonia synthesis unit, and the other end is connected to the input ends of two green ammonia deceleration and boosting units through an inlet pipe. A valve is provided on the green ammonia pipe. The green ammonia deceleration and boosting unit is a box-shaped structure with a guide plate arranged inside. A green ammonia nozzle is fixedly connected to the end face of the output end. The green ammonia nozzle is a plate with multiple regular through-holes. The passage between the two green ammonia deceleration and boosting units is the combustion air passage. The outer shell, the peripheral wind partition wall, and the venturi tube wall are sequentially arranged from the outside to the inside, and the green ammonia speed reduction and pressurization device is fixedly connected to the inner side of the venturi tube wall near the output end; the cavity between the peripheral wind partition wall and the outer shell serves as the peripheral wind channel; one end of the venturi tube wall is flush with the output end of the green ammonia nozzle, and the other end is inclined toward the outer shell, and the cavity between the venturi tube wall and the peripheral wind partition wall serves as the air distribution channel; The two low-nitrogen burners and the two plasma or micro-oil ignition burner nozzles are all pulverized coal combustion devices. The green ammonia burner nozzle is used to deliver green ammonia and hot air into the boiler combustion zone. The pulverized coal combustion device is used to deliver pulverized coal and primary hot air into the boiler combustion zone. The two plasma or micro-oil ignition burner nozzles are also used for ignition; the upper hot air nozzle, the middle hot air nozzle, and the lower hot air nozzle are used to supplement secondary hot air to the boiler combustion zone.

2. The large wall-type tangentially fired boiler low-temperature, low-nitrogen, green ammonia coal composite combustion system according to claim 1 is characterized in that: An air damper is provided in the air distribution channel for adjusting the air volume and wind speed.

3. The large wall-type tangentially fired boiler low-temperature, low-nitrogen, green ammonia coal composite combustion system according to claim 1 is characterized in that: It also includes a wind speed measuring device, which is arranged in the air distribution channel and is used to measure the hot air volume.

4. The large wall-type tangentially fired boiler low-temperature, low-nitrogen, green ammonia coal composite combustion system according to claim 1 is characterized in that: Air dampers are respectively provided in the upper hot air nozzle, the middle hot air nozzle and the lower hot air nozzle to adjust the air volume and wind speed of the secondary hot air.

5. The large-scale wall-type tangentially fired boiler low-temperature, low-nitrogen, green ammonia coal composite combustion system according to claim 1 is characterized in that: A flame monitoring device is provided in the combustion system, and the detection results are fed back to the control system to adjust the combustion conditions in real time; the control system includes a programmable logic controller and a distributed control system.

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