A low-temperature, low-nitrogen, dual-air-regulated green ammonia coal-fired composite combustion device

Abstract

The present invention discloses a low-temperature, low-nitrogen, dual-air green ammonia coal-fired composite combustion device, including an ammonia output component and a primary air powder conveying component, a secondary air conveying component, and a tertiary air conveying component arranged on its periphery from the inside to the outside; one end of the ammonia pipe is connected to the output end of the green ammonia synthesis device, and the other end is connected to the ammonia speed reduction and pressure device through an ammonia introduction pipeline, and a green ammonia introduction valve is provided on the ammonia pipe; an ammonia combustion air supply port is provided on the shell of the combustion device; the ammonia speed reduction and pressure device is a column with a through hole provided at the axis, and the through hole serves as a hot air channel for the combustion air to be output from the center to the recirculation area; the ammonia speed reduction and pressure device is a box structure, and an ammonia combustion nozzle is fixedly connected to the end face of its output end; the ammonia venturi tube and the primary air powder inner tube are coaxially arranged on the periphery of the ammonia speed reduction and pressure device from the inside to the outside. The present invention can achieve multi-stage air distribution, reduce coal consumption and carbon emissions, and can achieve low-temperature, low-nitrogen, quasi-homogeneous combustion, 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, dual-adjusted air, green ammonia, and coal-fired composite combustion device. Background Art

[0002] Under the dual carbon goals, reconstructing the coal-fired power technology system centered around "electricity-hydrogen-ammonia-coal" is a key technical approach for building a new power system. However, the unstable combustion caused by ammonia's low reactivity, as well as the high NOx emissions and flexibility caused by fuel nitrogen, are key technical bottlenecks that need to be addressed in ammonia-coal blending. Currently, the swirl ammonia-coal burners used in large opposed-fired boiler units simply feed ammonia and pulverized coal into the furnace and generally lack the environmentally friendly characteristics of low-temperature and low-nitrogen combustion. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the present invention proposes a low-temperature, low-nitrogen, dual-adjusted air, green ammonia, and coal-fired composite combustion device.

[0004] The specific technical solutions are as follows:

[0005] A low-temperature, low-nitrogen, dual-air-regulated green ammonia coal-fired composite combustion device comprises: an ammonia output assembly, a primary air powder conveying assembly, a secondary air conveying assembly, and a tertiary air conveying assembly; the primary air conveying assembly, the secondary air conveying assembly, and the tertiary air conveying assembly are coaxially arranged on the periphery of the ammonia output assembly from the inside to the outside, thereby realizing graded air supply;

[0006] The ammonia output assembly includes: an ammonia pipe, an ammonia introduction pipe, an ammonia deceleration and pressurizing device, an ammonia combustion nozzle, an ammonia venturi tube, a primary air powder inner pipe, and an ammonia combustion air supply port; one end of the ammonia pipe is connected to the output end of the green ammonia synthesis device, and the other end is connected to the axially symmetrical positions of the ammonia deceleration and pressurizing device through the ammonia introduction pipe. A green ammonia introduction valve is provided on the ammonia pipe for controlling the green ammonia flow rate; an ammonia combustion air supply port is provided at a position near the green ammonia input end of the combustion device shell, for inputting combustion air into the ammonia output assembly; the ammonia deceleration and pressurizing device is a column with a through hole provided at the axis center, and the through hole serves as a hot air channel for the combustion air to be output from the center to the recirculation area; the ammonia deceleration and pressurizing device is a box structure, with a guide plate arranged inside, and an ammonia combustion nozzle is fixedly connected to the end face of the output end, and the ammonia combustion nozzle is a circular plate with a plurality of through holes evenly provided in the circumferential direction;

[0007] The ammonia venturi tube is coaxially arranged on the periphery of the ammonia speed reduction and pressurization device, and the ammonia speed reduction and pressurization device is fixedly connected to the inner wall of the ammonia venturi tube; the primary air powder inner tube is coaxially arranged on the periphery of the ammonia venturi tube, and its output end is expanded outward.

[0008] Furthermore, the primary air-powder conveying assembly includes: a primary air-powder outer tube, a primary air-powder nozzle and expansion, a primary air-powder concentrator, a primary air-powder guide, and a primary air-powder inlet elbow; the primary air-powder includes primary air and pulverized coal;

[0009] The primary air powder outer tube is coaxially arranged on the outer periphery of the primary air powder inner tube, and the cavity between the two serves as the primary air channel; the input end of the primary air powder outer tube is fixedly connected to a primary air powder inlet elbow, and the primary air powder is input into the primary air channel from the primary air powder inlet elbow; a primary air powder guide is provided at the upper end of the inner wall of the primary air powder outer tube near the primary air powder inlet elbow, for guiding the flow direction of the primary air powder so that the primary air powder is evenly distributed in the primary air channel;

[0010] A primary air powder concentrator is provided on the inner wall of the primary air powder outer tube near the output end. The primary air powder concentrator is an annular protrusion with a trapezoidal cross section. The output end of the primary air powder outer tube is fixedly connected with a primary air powder nozzle and a flared port.

[0011] Furthermore, the secondary air delivery assembly includes: a secondary air outer pipe, a secondary air nozzle and flare, a secondary air cyclone, a secondary air volume controller 1, and a secondary air volume controller 2;

[0012] The secondary air outer pipe is coaxially arranged on the outer periphery of the primary air conveying assembly, and the cavity between the two serves as a secondary air channel; a secondary air inlet is opened on the secondary air outer pipe, and a secondary air nozzle and a flare are fixedly connected to the output end of the secondary air outer pipe;

[0013] A secondary air cyclone is provided in the secondary air channel between the secondary air inlet and the output end, for outputting the secondary air in the form of a swirl. The secondary air volume controller (1) is arranged in the secondary air channel behind the secondary air cyclone. The secondary air volume controller (1) includes a blocking member (1) and a movable structure. The blocking member (1) is sized to match the inlet size of the secondary air cyclone and moves back and forth driven by the movable structure to change the air volume entering the secondary air cyclone, thereby changing the swirl intensity.

[0014] The second secondary air volume controller is arranged on the outside of the secondary air outer pipe. The second secondary air volume controller includes a second blocking member and a movable structure. The size of the second blocking member is adapted to the size of the secondary air inlet. The second blocking member moves back and forth driven by the movable structure to change the opening size of the secondary air inlet, thereby changing the volume of the secondary air entering the secondary air channel.

[0015] Furthermore, the tertiary air delivery assembly includes: a tertiary air outer pipe, a tertiary air expansion port, a tertiary air cyclone, and a tertiary air volume controller;

[0016] The tertiary air outer pipe is coaxially arranged on the outer periphery of the secondary air conveying assembly, and the cavity between the two serves as a tertiary air channel; a tertiary air inlet is opened on the tertiary air outer pipe, and a tertiary air expansion port is fixedly connected to the output end of the tertiary air outer pipe;

[0017] A tertiary air cyclone is provided in the tertiary air channel between the tertiary air inlet and the output end, which is used to output the tertiary air in the form of a cyclone; the tertiary air volume controller is arranged behind the tertiary air cyclone in the tertiary air channel, and the tertiary air volume controller includes a blocking member three and a moving structure. The size of the blocking member three is adapted to the inlet size of the tertiary air volume controller, and it moves back and forth under the drive of the moving structure to change the air volume entering the tertiary air cyclone, thereby changing the cyclone intensity.

[0018] Furthermore, it also includes an air volume measuring device, one air volume measuring device is arranged in front of the tertiary air cyclone in the tertiary air channel, for monitoring the air volume of the tertiary air output by the cyclone, and the other air volume measuring device is arranged in front of the secondary air cyclone in the secondary air channel, for monitoring the air volume of the secondary air output by the cyclone.

[0019] Furthermore, an online monitoring device for ammonia combustion flame and coal combustion flame is set on the output side wall of the tertiary air conveying component, 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.

[0020] The beneficial effects of the present invention are:

[0021] The present invention can achieve multi-stage air distribution, so that boilers including large-scale hedge-arranged boiler units have the ability to burn green ammonia and coal, greatly reducing coal consumption and significantly reducing carbon emissions. The device of the present invention can achieve low-temperature and low-nitrogen combustion, taking into account combustion efficiency, economy and low-nitrogen environmental protection characteristics. The combustion device control system is smooth, the control method is simple, and the control performance is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a low-temperature, low-nitrogen, dual-air-adjusted green ammonia coal-fired composite combustion device in an embodiment of the present invention.

[0023] Figure 2 yes Figure 1 A partial enlarged view of the ammonia output component.

[0024] Figure 3 This is the left side view of the ammonia output assembly.

[0025] In the figure, there are primary air powder air flow guide flare 1-1, ammonia combustion air flow outer flare 1-2, ammonia speed reduction and pressurization device 1-3, hot air channel 1-4, ammonia introduction pipeline 1-5, ammonia venturi tube 1-6, primary air powder inner tube 1-7, ammonia tube 1-8, ammonia combustion nozzle 1-9, ammonia combustion air supply port 1-10; primary air powder nozzle and flare 2-1, primary air powder concentrator 2-2, primary air powder guide 2-3, primary air powder inlet elbow 2-4; secondary air nozzle and flare 3-1, secondary air cyclone 3-2, secondary air volume controller 1 3-3, secondary air volume controller 2 3-4; tertiary air flare 4-1, tertiary air cyclone 4-2, tertiary air volume controller 4-3; air volume measuring device 1 5-1, air volume measuring device 2 5-2; green ammonia introduction valve 7-1, green ammonia synthesis device 7-2. DETAILED DESCRIPTION

[0026] 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.

[0027] like Figure 1 As shown, a low-temperature, low-nitrogen, dual-air-regulated green ammonia coal-fired composite combustion device includes: an ammonia output assembly, a primary air and powder conveying assembly, a secondary air conveying assembly, a tertiary air conveying assembly, an air volume measuring device 1 5-1, an air volume measuring device 2 5-2, a green ammonia inlet valve 7-1, and a green ammonia synthesis unit 7-2. The green ammonia synthesis unit 7-2 is used to convert input green hydrogen into environmentally friendly green ammonia. The green ammonia inlet valve 7-1 and the green ammonia synthesis unit 7-2 are arranged outside the combustion device, and green ammonia is delivered via pipelines. The primary air conveying assembly, secondary air conveying assembly, and tertiary air conveying assembly are coaxially arranged from the inside out around the periphery of the ammonia output assembly to achieve staged air supply.

[0028] like Figure 1 and Figure 2As shown, the ammonia output assembly includes: a primary air powder flow guide flare 1-1, an ammonia combustion flow external flare 1-2, an ammonia deceleration and pressurization device 1-3, a hot air duct 1-4, an ammonia inlet pipe 1-5, an ammonia venturi 1-6, a primary air powder inner pipe 1-7, an ammonia pipe 1-8, an ammonia combustion nozzle 1-9, and an ammonia combustion air supply port 1-10. One end of ammonia pipe 1-8 is connected to the output of the green ammonia synthesis unit 7-2, and the other end is connected to the axially symmetrical ends of the ammonia deceleration and pressurization device 1-3 via the ammonia inlet pipe 1-5. Ammonia pipe 1-8 is equipped with a green ammonia inlet valve 7-1 to control the green ammonia flow rate. Ammonia combustion air supply port 1-10 is provided in the combustion unit housing near the green ammonia input end to supply combustion air to the ammonia output assembly. The ammonia deceleration and boosting device 1-3 is cylindrical, with a through-hole at its axis. This through-hole serves as the hot air channel 1-4, allowing combustion air to be output from the center to the recirculation area, providing the initial air distribution for green ammonia combustion. The direction of the ammonia output assembly's central axis output end is designated as the front, and the direction of the green ammonia input is designated as the rear.

[0029] The ammonia speed reduction and pressure boosting device 1-3 is a box structure, and an ammonia combustion nozzle 1-9 is fixedly connected to the end face of the output end. Figure 3 As shown, the ammonia combustion nozzle 1-9 is a circular plate with multiple holes uniformly distributed around its circumference. A guide plate is positioned within the ammonia deceleration and boosting device 1-3 to ensure that the green ammonia entering the ammonia combustion nozzle 1-9 is more evenly distributed, allowing it to pass through the ammonia combustion nozzle 1-9 and enter the recirculation zone more evenly. The placement of the ammonia combustion nozzle 1-9 reduces the flow rate of the green ammonia and increases the pressure within the ammonia deceleration and boosting device 1-3, helping the ammonia to be ejected from the ammonia combustion nozzle 1-9 at a suitable velocity.

[0030] Ammonia Venturi tube 1-6 is coaxially arranged around the periphery of ammonia deceleration and boosting device 1-3, which is fixedly attached to the inner wall of ammonia Venturi tube 1-6. Ammonia Venturi tube 1-6 directs the combustion-supporting airflow toward the center, achieving a certain degree of compression. Its outwardly flared output end, known as ammonia combustion airflow flare 1-2, helps maintain a stable fusion between the flames generated by ammonia combustion and the pulverized coal flame. Primary air and pulverized coal inner tube 1-7 is coaxially arranged around the periphery of ammonia Venturi tube 1-6. Its outwardly flared output end, known as primary air and pulverized coal airflow guide flare 1-1, guides the flow of primary air within the primary air conveying assembly.

[0031] like Figure 1As shown, the primary air powder conveying assembly includes: a primary air powder outer tube, a primary air powder nozzle and flare 2-1, a primary air powder concentrator 2-2, a primary air powder guide 2-3, and a primary air powder inlet elbow 2-4. The primary air powder outer tube is coaxially arranged around the primary air powder inner tube 1-7, with the cavity between the two serving as the primary air duct. The primary air powder inlet elbow 2-4 is fixedly connected to the input end of the primary air powder outer tube. Primary air powder (including primary air and pulverized coal) is fed into the primary air duct through the primary air powder inlet elbow 2-4. A primary air powder guide 2-3 (i.e., a structure fixedly connected to the inner wall of the primary air powder outer tube and having a downwardly inclined guide surface) is provided at the upper connection between the primary air powder outer tube and the primary air powder inlet elbow 2-4, where the primary air powder gathers after entering the primary air duct. This guide is used to guide the flow direction of the gathered primary air powder, ensuring that the primary air powder is evenly distributed in the primary air duct rather than concentrated in the upper portion. A primary air powder concentrator 2-2 is installed on the inner wall of the primary air powder outer tube near the output end. This concentrator 2-2 is a ring-shaped protrusion with a trapezoidal cross-section, facilitating fluid flow. This concentrator 2-2 reduces the volume of this section of the primary air passage, compressing the primary air powder and helping to concentrate the pulverized coal in the inner ring, creating a "concentrated inside and thin outside" pattern and improving combustion efficiency. A primary air powder nozzle and flare 2-1 are fixedly connected to the output end of the primary air powder outer tube, guiding the secondary air.

[0032] Furthermore, the primary air powder nozzle and the expansion port 2-1 and the ammonia combustion nozzle 1-9 are all made of wear-resistant and high-temperature resistant silicon carbide material.

[0033] like Figure 1As shown, the secondary air conveying assembly includes: a secondary air outer tube, a secondary air nozzle and flare 3-1, a secondary air cyclone 3-2, a secondary air volume controller 1 3-3, and a secondary air volume controller 2 3-4. The secondary air outer tube is coaxially arranged around the outer periphery of the primary air powder outer tube, with the cavity between the two serving as the secondary air channel. A secondary air inlet is provided on the secondary air outer tube, through which secondary air is fed into the secondary air channel. The output end of the secondary air outer tube is fixedly connected to the secondary air nozzle and flare 3-1, which serves as a guide for the tertiary air. A secondary air cyclone 3-2 is provided in the secondary air channel between the secondary air inlet and the output end, for delivering the secondary air into the recirculation zone in a swirling form. Secondary air volume controller 1 3-3 is arranged behind the secondary air cyclone 3-2 in the secondary air channel and includes a blocking member 1 and a movable structure. The size of blocking member 1 matches the size of the secondary air cyclone 3-2's inlet and can be moved forward and backward under the drive of the movable structure (a pull rod is used in this embodiment); forward movement of blocking member 1 can reduce the air volume entering the secondary air cyclone 3-2, thereby reducing the swirl intensity; conversely, backward movement of blocking member 1 can increase the air volume entering the secondary air cyclone 3-2, thereby increasing the swirl intensity. Secondary air volume controller 2 3-4 is arranged outside the secondary air outer pipe and also includes a blocking member 2 and a movable structure. The size of blocking member 2 matches the size of the secondary air inlet and can be moved forward and backward under the drive of the movable structure, thereby changing the opening size of the secondary air inlet and the volume of secondary air entering the secondary air channel.

[0034] like Figure 1 As shown, the tertiary air delivery assembly includes a tertiary air outer tube, a tertiary air flare 4-1, a tertiary air cyclone 4-2, and a tertiary air volume controller 4-3. The tertiary air outer tube is coaxially arranged around the outer periphery of the secondary air outer tube, with the cavity between the two serving as the tertiary air channel. A tertiary air inlet is defined on the tertiary air outer tube, through which tertiary air is fed into the tertiary air channel. The tertiary air flare 4-1 is fixedly connected to the output end of the tertiary air outer tube. A tertiary air cyclone 4-2 is located in the tertiary air channel between the tertiary air inlet and the output end, for outputting the tertiary air in a swirling form. The tertiary air volume controller 4-3 is arranged behind the tertiary air cyclone 4-2 in the tertiary air channel, and includes a blocking member 3 and a moving structure. The size of the blocking member 3 is adapted to the inlet size of the tertiary air volume controller 4-3, and can be moved forward and backward under the drive of the moving structure; the forward movement of the blocking member 3 can reduce the air volume entering the tertiary air cyclone 4-2, thereby reducing the cyclone intensity; conversely, the backward movement of the blocking member 3 can increase the air volume entering the tertiary air cyclone 4-2, thereby increasing the cyclone intensity.

[0035] Air volume measurement device 1 5-1 is located in front of the tertiary air cyclone 4-2 in the tertiary air duct to monitor the volume of the tertiary air output by the cyclone. A large wind box (not shown) is located on the periphery of the tertiary air outer duct. Air is drawn into the large wind box, which then enters the tertiary air duct through the tertiary air inlet or the secondary air duct through the secondary air inlet. Air volume measurement device 2 5-2 is located in the large wind box to monitor the air volume within it.

[0036] 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 the green ammonia synthesis unit 7-2. The resulting green ammonia is transported through the ammonia pipe 1-8 and fed through the ammonia inlet pipe 1-5 into the ammonia deceleration and pressure-increasing device 1-3. At this point, the green ammonia flow rate is reduced to 1-8 m / s, and the ammonia pressure is increased. The coordinated action of the ammonia deceleration and pressure-increasing device 1-3, the ammonia combustion nozzle 1-9, and the ammonia venturi 1-6 delivers the green ammonia into the recirculation zone (annular or central recirculation zone) at a flow rate of 9-160 m / s.

[0037] Simultaneously, the primary air, carrying pulverized coal, passes through the primary air pulverized coal inlet elbow 2-4, primary air pulverized coal guide 2-3, primary air pulverized coal concentrator 2-2, primary air pulverized coal nozzle, and flare 2-1, sequentially entering the recirculation zone. This achieves uniform distribution and concentration of the pulverized coal, controls the excess air coefficient to be well below 1, and achieves low-temperature, low-nitrogen combustion of the pulverized coal. Secondary hot air enters the recirculation zone through the secondary air cyclone 3-2, supplementing combustion. The air volume and speed can be adjusted using secondary air volume controller 1 3-3 and secondary air volume controller 2 3-4. Tertiary hot air further supplements combustion through the tertiary air cyclone 4-2. The air volume and speed can be adjusted using tertiary air volume controller 4-3, achieving step-by-step air distribution.

[0038] After entering the annular or central recirculation zone, green ammonia entrains flue gases, and secondary and tertiary air gradually provide oxygen for combustion. The purpose of controlling both the spatial and temporal scales of combustion is achieved through graded air supply. The total excess air coefficient of green ammonia combustion is equal to or less than 1, thereby achieving low-temperature combustion and quasi-homogeneous combustion, reducing the generation of fuel nitrogen during green ammonia combustion, and realizing low-temperature and low-nitrogen combustion.

[0039] The low-temperature, low-nitrogen, dual-air-adjusted green ammonia coal-fired composite combustion device uses two air volume measuring devices to monitor and adjust the secondary air pressure and wind speed, and tertiary air pressure and wind speed entering the recirculation zone in real time to ensure that it operates under reasonable working conditions.

[0040] The device injects a mixed airflow of green ammonia and pulverized coal into the recirculation zone and ignites it through other burners. Online monitoring devices for ammonia combustion flame and coal combustion flame are used, and the combustion conditions are adjusted in real time through a programmable logic controller (PLC), a distributed control system (DCS) or other control systems to meet the requirements of safe production, low pollution emissions and the user's requirements for the parameters of various outputs of the combustion device.

[0041] In the low-temperature, low-nitrogen, dual-adjusted air green ammonia coal-fired composite combustion device proposed by the present invention, the swirl intensity has a great influence on the mixing of fuel and air in the early stage of combustion, while the turbulence intensity has a great influence on the process in the late stage of combustion (the turbulence intensity can be changed by adjusting the size and number of the through holes opened on the ammonia combustion nozzle 1-9). The secondary air cyclone 3-2 or the tertiary air cyclone 4-2 promotes the mixing of fuel and air, promotes the rapid ignition and stable combustion of ammonia fuel. In addition, adjusting the turbulence intensity will also adjust the mixed combustion temperature of ammonia fuel and air, reduce NO x Generate concentration.

[0042] 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 low-temperature, low-nitrogen, dual-air green ammonia coal-fired composite combustion device, characterized in that: include: Ammonia output assembly, primary air powder conveying assembly, secondary air conveying assembly, tertiary air conveying assembly; the periphery of the ammonia output assembly is coaxially arranged with the primary air conveying assembly, secondary air conveying assembly, and tertiary air conveying assembly from the inside to the outside to achieve graded air supply; The ammonia output assembly includes: an ammonia pipe, an ammonia introduction pipe, an ammonia deceleration and pressurizing device, an ammonia combustion nozzle, an ammonia venturi tube, a primary air powder inner pipe, and an ammonia combustion air supply port; one end of the ammonia pipe is connected to the output end of the green ammonia synthesis device, and the other end is connected to the axially symmetrical positions of the ammonia deceleration and pressurizing device through the ammonia introduction pipe. A green ammonia introduction valve is provided on the ammonia pipe for controlling the green ammonia flow rate; an ammonia combustion air supply port is provided at a position near the green ammonia input end of the combustion device shell, for inputting combustion air into the ammonia output assembly; the ammonia deceleration and pressurizing device is a column with a through hole provided at the axis center, and the through hole serves as a hot air channel for the combustion air to be output from the center to the recirculation area; the ammonia deceleration and pressurizing device is a box structure, with a guide plate arranged inside, and an ammonia combustion nozzle is fixedly connected to the end face of the output end, and the ammonia combustion nozzle is a circular plate with a plurality of through holes evenly provided in the circumferential direction; The ammonia venturi tube is coaxially arranged on the periphery of the ammonia speed reduction and pressurization device, and the ammonia speed reduction and pressurization device is fixedly connected to the inner wall of the ammonia venturi tube; the primary air powder inner tube is coaxially arranged on the periphery of the ammonia venturi tube, and its output end is expanded outward.

2. The low-temperature, low-nitrogen, dual-adjusted air, green ammonia, coal-fired composite combustion device according to claim 1 is characterized in that: The primary air-powder conveying assembly includes: a primary air-powder outer tube, a primary air-powder nozzle and expansion port, a primary air-powder concentrator, a primary air-powder guide, and a primary air-powder inlet elbow; the primary air-powder includes primary air and pulverized coal; The primary air powder outer tube is coaxially arranged on the outer periphery of the primary air powder inner tube, and the cavity between the two serves as the primary air channel; the input end of the primary air powder outer tube is fixedly connected to a primary air powder inlet elbow, and the primary air powder is input into the primary air channel from the primary air powder inlet elbow; a primary air powder guide is provided at the upper end of the inner wall of the primary air powder outer tube near the primary air powder inlet elbow, for guiding the flow direction of the primary air powder so that the primary air powder is evenly distributed in the primary air channel; A primary air powder concentrator is provided on the inner wall of the primary air powder outer tube near the output end. The primary air powder concentrator is an annular protrusion with a trapezoidal cross section. The output end of the primary air powder outer tube is fixedly connected with a primary air powder nozzle and a flared port.

3. The low-temperature, low-nitrogen, dual-adjusted air, green ammonia, coal-fired composite combustion device according to claim 1 is characterized in that: The secondary air delivery assembly includes: a secondary air outer pipe, a secondary air nozzle and flare, a secondary air cyclone, a secondary air volume controller 1, and a secondary air volume controller 2; The secondary air outer pipe is coaxially arranged on the outer periphery of the primary air conveying assembly, and the cavity between the two serves as a secondary air channel; a secondary air inlet is opened on the secondary air outer pipe, and a secondary air nozzle and a flare are fixedly connected to the output end of the secondary air outer pipe; A secondary air cyclone is provided in the secondary air channel between the secondary air inlet and the output end, for outputting the secondary air in the form of a swirl. The secondary air volume controller (1) is arranged in the secondary air channel behind the secondary air cyclone. The secondary air volume controller (1) includes a blocking member (1) and a movable structure. The blocking member (1) is sized to match the inlet size of the secondary air cyclone and moves back and forth driven by the movable structure to change the air volume entering the secondary air cyclone, thereby changing the swirl intensity. The second secondary air volume controller is arranged on the outside of the secondary air outer pipe. The second secondary air volume controller includes a second blocking member and a movable structure. The size of the second blocking member is adapted to the size of the secondary air inlet. The second blocking member moves back and forth driven by the movable structure to change the opening size of the secondary air inlet, thereby changing the volume of the secondary air entering the secondary air channel.

4. The low-temperature, low-nitrogen, dual-adjusted air, green ammonia, coal-fired composite combustion device according to claim 1 is characterized in that: The tertiary air delivery assembly includes: a tertiary air outer pipe, a tertiary air expansion port, a tertiary air cyclone, and a tertiary air volume controller; The tertiary air outer pipe is coaxially arranged on the outer periphery of the secondary air conveying assembly, and the cavity between the two serves as a tertiary air channel; a tertiary air inlet is opened on the tertiary air outer pipe, and a tertiary air expansion port is fixedly connected to the output end of the tertiary air outer pipe; A tertiary air cyclone is provided in the tertiary air channel between the tertiary air inlet and the output end, which is used to output the tertiary air in the form of a cyclone; the tertiary air volume controller is arranged behind the tertiary air cyclone in the tertiary air channel, and the tertiary air volume controller includes a blocking member three and a moving structure. The size of the blocking member three is adapted to the inlet size of the tertiary air volume controller, and it moves back and forth under the drive of the moving structure to change the air volume entering the tertiary air cyclone, thereby changing the cyclone intensity.

5. The low-temperature, low-nitrogen, dual-adjusted air, green ammonia, coal-fired composite combustion device according to claim 1 is characterized in that: It also includes an air volume measuring device, one air volume measuring device is arranged in front of the tertiary air cyclone in the tertiary air channel, and is used to monitor the air volume of the tertiary air output by the cyclone, and the other air volume measuring device is arranged in front of the secondary air cyclone in the secondary air channel, and is used to monitor the air volume of the secondary air output by the cyclone.

6. The low-temperature, low-nitrogen, dual-adjusted air, green ammonia, coal-fired composite combustion device according to claim 1 is characterized in that: An online monitoring device for ammonia combustion flame and coal combustion flame is installed on the output side wall of the tertiary air conveying assembly. 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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