Low-temperature low-nitrogen double-air-regulation green ammonia fire coal compound combustion device

Abstract

The invention discloses a low-temperature low-nitrogen double-air-regulation green ammonia fire coal composite combustion device which 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 powder conveying assembly, the secondary air conveying assembly and the tertiary air conveying assembly are arranged on the periphery of the ammonia output assembly from inside to outside. One end of the ammonia pipe is communicated with the output end of the green ammonia synthesis device, the other end of the ammonia pipe is communicated with the ammonia speed reducing and pressurizing device through an ammonia introduction pipeline, and a green ammonia introduction valve is arranged on the ammonia pipe; an ammonia combustion-supporting air supply outlet is formed in a shell of the combustion device; the ammonia speed reducing and pressurizing device is a cylinder with a through hole formed in the axis, and the through hole serves as a hot air channel for outputting combustion-supporting air from the center to the backflow area; the ammonia speed-reducing supercharging device is of a box body structure, and the end face of the output end of the ammonia speed-reducing supercharging device is fixedly connected with an ammonia combustion nozzle; and the ammonia venturi tube and the primary air powder inner tube are sequentially and coaxially arranged on the periphery of the ammonia speed reducing and pressurizing device from inside to outside. According to the multi-stage air distribution device, multi-stage air distribution can be achieved, fire coal consumption and carbon emission are reduced, low-temperature, low-nitrogen and homogeneous-like combustion can be achieved, and NOx emission is reduced.

Description

Technical Field

[0001] The invention relates to the field of large boiler combustion, and in particular to a low-temperature, low-nitrogen, dual-adjusted air, green ammonia, coal-fired composite combustion device. Background Art

[0002] Under the background of dual carbon goals, the reconstruction of the coal-fired power technology system with "electricity-hydrogen-ammonia-coal" as the core is one of the important technical routes for the construction of new power systems. However, the unstable combustion caused by the low reactivity of ammonia, as well as the high NOx emissions and flexibility caused by fuel nitrogen, are important technical bottlenecks that need to be solved in the combustion of ammonia and coal. At present, the swirl ammonia-coal burners equipped in large-scale hedge-fired boiler units simply deliver ammonia and coal powder into the furnace, and generally do not have the environmentally friendly characteristics of low-temperature combustion and low-nitrogen combustion. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention proposes a low-temperature, low-nitrogen, dual-air-adjusting green ammonia coal-fired composite combustion device.

[0004] The specific technical solutions are as follows:

[0005] A low-temperature, low-nitrogen, double-adjusted air green ammonia coal-fired composite combustion device, comprising: an ammonia output component, a primary air powder conveying component, a secondary air conveying component, and a tertiary air conveying component; the periphery of the ammonia output component is coaxially arranged with the primary air conveying component, the secondary air conveying component, and the tertiary air conveying component from the inside to the outside in order to realize graded air supply;

[0006] The ammonia output assembly comprises: an ammonia pipe, an ammonia introduction pipeline, an ammonia speed reduction and pressure-boosting device, an ammonia combustion nozzle, an ammonia venturi tube, a primary air powder inner tube, and an ammonia combustion-supporting 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 speed reduction and pressure-boosting device through the ammonia introduction pipeline, and a green ammonia introduction valve is provided on the ammonia pipe for controlling the green ammonia flow rate; an ammonia combustion-supporting air supply port is provided at a position near the green ammonia input end of the shell of the combustion device for inputting combustion-supporting air into the ammonia output assembly; the ammonia speed reduction and pressure-boosting 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-supporting air to be output from the center to the reflow zone; the ammonia speed reduction and pressure-boosting device is a box structure, a guide plate is 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 pressure boosting device, and the ammonia speed reduction and pressure boosting 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 coal powder;

[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 is used as the primary air channel; the input end of the primary air powder outer tube is fixedly connected with 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; the upper end of the inner wall of the primary air powder outer tube is provided with a primary air powder guide near the primary air powder inlet elbow, which is used to guide 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 arranged 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 opening.

[0011] Further, the secondary air delivery assembly includes: a secondary air outer pipe, a secondary air nozzle and a 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 provided on the secondary air outer pipe, and a secondary air nozzle and a flared port 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, and is used to output the secondary air in the form of a cyclone; the secondary air volume controller 1 is arranged behind the secondary air cyclone in the secondary air channel, and the secondary air volume controller includes a blocking member 1 and a moving structure, the size of the blocking member 1 is adapted to the inlet size of the secondary air cyclone, and the blocking member 1 moves forward and backward under the drive of the moving structure, so as to change the air volume entering the secondary air cyclone, and thus change the cyclone intensity;

[0014] The secondary air volume controller 2 is arranged on the outside of the secondary air outer pipe. The secondary air volume controller 2 includes a blocking member 2 and a moving structure. The size of the blocking member 2 is adapted to the size of the secondary air inlet. The blocking member 2 moves back and forth driven by the moving 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] Further, 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 provided 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, 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.

[0019] Furthermore, an online monitoring device for ammonia combustion flame and coal combustion flame is arranged on the output side wall of the tertiary air conveying assembly, 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 emission levels; 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-adjusting 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, the primary air powder air flow guide expansion 1-1, the ammonia combustion air flow external expansion 1-2, the ammonia speed reduction and pressurization device 1-3, the hot air channel 1-4, the ammonia introduction pipeline 1-5, the ammonia venturi tube 1-6, the primary air powder inner tube 1-7, the ammonia tube 1-8, the ammonia combustion nozzle 1-9, the ammonia combustion air supply port 1-10; the primary air powder nozzle and expansion 2-1, the primary air powder concentrator 2-2, the primary air powder guide 2-3, the primary air powder inlet elbow 2-4; the secondary air nozzle and expansion 3-1, the secondary air cyclone 3-2, the secondary air volume controller one 3-3, the secondary air volume controller two 3-4; the tertiary air expansion 4-1, the tertiary air cyclone 4-2, the tertiary air volume controller 4-3; the air volume measuring device one 5-1, the air volume measuring device two 5-2; the green ammonia introduction valve 7-1, the green ammonia synthesis device 7-2. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below according to the accompanying drawings and preferred embodiments, and the purpose and effect of the present invention will become more clear. 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 used to explain the present invention and are not intended to limit the present invention.

[0027] like Figure 1 As shown, a low-temperature, low-nitrogen, dual-adjustment air green ammonia coal-fired composite combustion device includes: an ammonia output component, a primary air powder conveying component, a secondary air conveying component, a tertiary air conveying component, an air volume measuring device 1 5-1, an air volume measuring device 2 5-2, a green ammonia introduction valve 7-1, and a green ammonia synthesis device 7-2. The green ammonia synthesis device 7-2 is used to convert the input green hydrogen into green and environmentally friendly green ammonia. The green ammonia introduction valve 7-1 and the green ammonia synthesis device 7-2 are arranged outside the entire combustion device, and green ammonia is transported through pipelines. The periphery of the ammonia output component is coaxially arranged with a primary air conveying component, a secondary air conveying component, and a tertiary air conveying component from the inside to the outside to achieve graded air supply.

[0028] like Figure 1 and Figure 2As shown, the ammonia output assembly includes: a primary air powder air flow guide expansion 1-1, an ammonia combustion air flow external expansion 1-2, an ammonia speed reduction and pressure boosting device 1-3, a hot air channel 1-4, an ammonia introduction pipeline 1-5, an ammonia venturi tube 1-6, a primary air powder inner tube 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 the ammonia pipe 1-8 is connected to the output end of the green ammonia synthesis device 7-2, and the other end is connected to the axially symmetrical ends of the ammonia speed reduction and pressure boosting device 1-3 through the ammonia introduction pipeline 1-5. A green ammonia introduction valve 7-1 is provided on the ammonia pipe 1-8 for controlling the green ammonia flow rate. An ammonia combustion air supply port 1-10 is provided near the green ammonia input end of the combustion device shell for inputting combustion air into the ammonia output assembly. The ammonia deceleration and pressure boosting device 1-3 is columnar, and a through hole is provided at its axis. The through hole is used as a hot air channel 1-4 for the combustion-supporting air to be output from the center to the reflow area, and is used for the initial air distribution for green ammonia combustion. The output end direction of the central axis of the ammonia output component is recorded as the front, and the green ammonia input direction is recorded 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 surface of the output end. Figure 3 As shown, the ammonia combustion nozzle 1-9 is a circular plate with multiple through holes evenly opened in the circumferential direction; a guide plate is arranged in the ammonia deceleration and supercharging device 1-3 to make the green ammonia entering the ammonia combustion nozzle 1-9 more uniform, so that it can pass through the ammonia combustion nozzle 1-9 more evenly into the reflow zone. Due to the arrangement of the ammonia combustion nozzle 1-9, the flow rate of green ammonia is reduced, and the pressure in the ammonia deceleration and supercharging device 1-3 is increased, which helps ammonia to be ejected from the ammonia combustion nozzle 1-9 at a suitable speed.

[0030] The ammonia venturi tube 1-6 is coaxially arranged on the periphery of the ammonia speed reduction and boosting device 1-3, and the ammonia speed reduction and boosting device 1-3 is fixedly connected to the inner wall of the ammonia venturi tube 1-6. The ammonia venturi tube 1-6 guides the combustion-supporting wind to the center to achieve a certain degree of compression. Its output end is expanded outward, that is, the ammonia combustion airflow expansion port 1-2, which helps to keep the flame generated by the ammonia combustion and the coal powder flame fused in a certain way. The primary air powder inner tube 1-7 is coaxially arranged on the periphery of the ammonia venturi tube 1-6, and its output end is expanded outward, that is, the primary air powder airflow guide expansion port 1-1, which guides the flow direction of the primary air in 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 expansion 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 on the outer periphery of the primary air powder inner tube 1-7, and the cavity between the two is used as a primary air channel. The input end of the primary air powder outer tube is fixedly connected with a primary air powder inlet elbow 2-4, and the primary air powder (including primary air and coal powder) is input into the primary air channel from the primary air powder inlet elbow 2-4. The 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 downward inclined guide surface) is provided at the upper end connection of the primary air powder outer tube and the primary air powder inlet elbow 2-4, that is, the gathering place of the primary air powder after entering the primary air channel, is used to guide the flow direction of the gathered primary air powder so that the primary air powder can be evenly distributed in the primary air channel instead of being concentrated in the upper part. The inner wall of the primary air powder outer tube near the output end is provided with a primary air powder concentrator 2-2, which is an annular protrusion with a trapezoidal cross section. This design facilitates fluid flow; the setting of the primary air powder concentrator 2-2 reduces the volume of this section of the primary air channel, thereby playing a role in compressing the primary air powder, helping to concentrate the pulverized coal in the inner ring, forming a "thick inside and thin outside" situation, and improving combustion efficiency. The output end of the primary air powder outer tube is fixedly connected with a primary air powder nozzle and a flare 2-1, which plays a role in 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 a 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 on the outer periphery of the primary air powder outer tube, and the cavity between the two serves as a secondary air channel. A secondary air inlet is provided on the secondary air outer tube, and the secondary air is input into the secondary air channel from the secondary air inlet. The output end of the secondary air outer tube is fixedly connected with a secondary air nozzle and a flare 3-1, which plays a role in guiding 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, which is used to deliver the secondary air into the reflow area in the form of a swirl. The 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 moving structure. The size of the blocking member 1 matches the size of the inlet of the secondary air cyclone 3-2, and can move forward and backward under the drive of the moving structure (a pull rod is used in this embodiment); the forward movement of the blocking member 1 can reduce the air volume entering the secondary air cyclone 3-2, thereby reducing the swirl intensity; conversely, the backward movement of the blocking member 1 can increase the air volume entering the secondary air cyclone 3-2, thereby increasing the swirl intensity. The secondary air volume controller 2 3-4 is arranged outside the secondary air outer pipe, and also includes a blocking member 2 and a moving structure. The size of the blocking member 2 matches the size of the secondary air inlet, and the blocking member 2 moves forward and backward under the drive of the moving structure, thereby changing the opening size of the secondary air inlet, and changing the air volume of the secondary air entering the secondary air channel.

[0034] like Figure 1 As shown, the tertiary air conveying assembly includes: a tertiary air outer pipe, a tertiary air expansion port 4-1, a tertiary air cyclone 4-2, and a tertiary air volume controller 4-3. The tertiary air outer pipe is coaxially arranged on the outer periphery of the secondary air outer pipe, and the cavity between the two is used as a tertiary air channel. A tertiary air inlet is provided on the tertiary air outer pipe, and the tertiary air is input into the tertiary air channel from the tertiary air inlet. The output end of the tertiary air outer pipe is fixedly connected with the tertiary air expansion port 4-1. A tertiary air cyclone 4-2 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 swirl. 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 driven by 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] The air volume measuring device 1 5-1 is arranged in front of the tertiary air cyclone 4-2 in the tertiary air channel, and is used to monitor the air volume of the tertiary air output by the cyclone. A large wind box (not shown in the figure) is arranged on the periphery of the tertiary air outer pipe, and air is introduced into the large wind box. The air enters the tertiary air channel through the tertiary air inlet, or enters the secondary air channel through the secondary air inlet; the air volume measuring device 2 5-2 is arranged in the large wind box, and is used to monitor the air volume in the large wind box.

[0036] In practical applications, the surplus electricity from renewable energy sources such as wind power and solar power generation is used to produce green hydrogen through water electrolysis (or other methods), and the green hydrogen produced is input into the green ammonia synthesis device 7-2. The green ammonia produced is transported through the ammonia pipe 1-8 and input into the ammonia speed reduction and pressure boosting device 1-3 through the ammonia introduction pipeline 1-5. At this time, the green ammonia flow rate is reduced to 1-8 m / s, and the green ammonia pressure is increased. Under the synergistic effect of the ammonia speed reduction and pressure boosting device 1-3, the ammonia combustion nozzle 1-9, and the ammonia venturi tube 1-6, the green ammonia is sent into the recirculation zone (annular or central recirculation zone) at a flow rate of 9-160 m / s.

[0037] At the same time, the primary air carries the pulverized coal through the primary air pulverizer inlet elbow 2-4, the primary air pulverizer guide 2-3, the primary air pulverizer concentrator 2-2, the primary air pulverizer nozzle and the expansion 2-1 to enter the recirculation zone in turn, achieving the purpose of uniform pulverized coal and pulverized coal concentration, controlling the excess air coefficient to be much less than 1, and achieving low-temperature and low-nitrogen combustion of pulverized coal. The secondary hot air enters the recirculation zone through the secondary air cyclone 3-2 to supplement the combustion air. The air volume and wind speed can be adjusted through the secondary air volume controller 1 3-3 and the secondary air volume controller 2 3-4. The tertiary hot air passes through the tertiary air cyclone 4-2 to supplement the combustion air again. The air volume and wind speed can be adjusted through the tertiary air volume controller 4-3 to achieve the purpose of step-by-step air distribution.

[0038] After entering the annular or central recirculation zone, green ammonia entrains smoke, and secondary and tertiary air gradually provide oxygen for combustion. The purpose of controlling the space and time 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-adjustable 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 the tertiary air pressure and wind speed entering the recirculation zone in real time to ensure that it works under reasonable working conditions.

[0040] The green ammonia and pulverized coal mixed air flow injected into the recirculation zone of this device is ignited through other burners, and an ammonia combustion flame and a coal flame online monitoring device are used. 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 user parameters for various outputs of the combustion device.

[0041] In the low-temperature, low-nitrogen, dual-wind 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 through holes opened on the ammonia combustion nozzle 1-9). The secondary wind cyclone 3-2 or the tertiary wind cyclone 4-2 promotes the mixing of fuel and air, and 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 can understand that the above are only preferred examples of the invention and are not intended to limit the invention. Although the invention is described in detail with reference to the above examples, those skilled in the art can still modify the technical solutions recorded in the above examples or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, etc. made within the spirit and principle of the invention shall be included in the protection scope of the invention.

Claims

1. A low-temperature, low-nitrogen, dual-air-adjusted 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 primary air conveying assembly, secondary air conveying assembly, tertiary air conveying assembly from inside to outside in order to realize graded air supply; The ammonia output assembly comprises: an ammonia pipe, an ammonia introduction pipeline, an ammonia speed reduction and pressure-boosting device, an ammonia combustion nozzle, an ammonia venturi tube, a primary air powder inner tube, and an ammonia combustion-supporting 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 speed reduction and pressure-boosting device through the ammonia introduction pipeline, and a green ammonia introduction valve is provided on the ammonia pipe for controlling the green ammonia flow rate; an ammonia combustion-supporting air supply port is provided at a position near the green ammonia input end of the shell of the combustion device for inputting combustion-supporting air into the ammonia output assembly; the ammonia speed reduction and pressure-boosting 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-supporting air to be output from the center to the reflow zone; the ammonia speed reduction and pressure-boosting device is a box structure, a guide plate is 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 pressure boosting device, and the ammonia speed reduction and pressure boosting 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-air-adjusted green ammonia coal-fired composite combustion device according to claim 1 is characterized in that: The primary air-powder conveying assembly comprises: 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 comprises primary air and coal powder; 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 is used as the primary air channel; the input end of the primary air powder outer tube is fixedly connected with 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; the upper end of the inner wall of the primary air powder outer tube is provided with a primary air powder guide near the primary air powder inlet elbow, which is used to guide 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 arranged 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 opening.

3. The low-temperature, low-nitrogen, dual-air-adjusted green ammonia coal-fired composite combustion device according to claim 1 is characterized in that: The secondary air delivery assembly comprises: a secondary air outer pipe, a secondary air nozzle and a flared port, 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 provided on the secondary air outer pipe, and a secondary air nozzle and a flared port 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, and is used to output the secondary air in the form of a cyclone; the secondary air volume controller 1 is arranged behind the secondary air cyclone in the secondary air channel, and the secondary air volume controller includes a blocking member 1 and a moving structure, the size of the blocking member 1 is adapted to the inlet size of the secondary air cyclone, and the blocking member 1 moves forward and backward under the drive of the moving structure, so as to change the air volume entering the secondary air cyclone, and thus change the cyclone intensity; The secondary air volume controller 2 is arranged on the outside of the secondary air outer pipe. The secondary air volume controller 2 includes a blocking member 2 and a moving structure. The size of the blocking member 2 is adapted to the size of the secondary air inlet. The blocking member 2 moves back and forth driven by the moving 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-air-adjusted 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 provided 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-air-adjusted 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-air-adjusted green ammonia coal-fired composite combustion device according to claim 1 is characterized in that: An ammonia combustion flame and a coal combustion flame online monitoring device is arranged on the output side wall of the tertiary air conveying assembly, 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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