An ammonia coal combustion injection device

Abstract

This invention provides an ammonia-coal combustion injection device, comprising a first injection mechanism and a second injection mechanism. The first and second injection mechanisms are located inside a furnace. The furnace contains a first combustion zone and a second combustion zone, separated by a second partition and a sliding plate. At both ends of the furnace are installed a first partition and a third partition with arc-shaped sidewalls, the third partition being inclined inside the furnace. The first injection mechanism is installed at the top of the first combustion zone, and the second injection mechanism is installed inside the second combustion zone. The ammonia-coal combustion injection device provided by this invention has the advantages of rapid preheating of ammonia and improved ammonia mixing efficiency.

Description

Technical Field

[0001] This invention relates to the field of ammonia-coal co-combustion technology, and in particular to an ammonia-coal combustion injection device. Background Technology

[0002] Ammonia-blended combustion refers to a technology that incorporates ammonia gas into fuel for co-combustion, thereby improving combustion efficiency. Ammonia, a gas with a high hydrogen content, can be mixed and burned with some difficult-to-burn solid and liquid fuels, thus enhancing combustion efficiency. During combustion, the nitrogen in ammonia participates in chemical reactions. On one hand, ammonia combustion can replace some coal combustion, reducing coal consumption and directly lowering carbon dioxide emissions. On the other hand, some intermediate products generated during ammonia combustion help promote more complete coal combustion, further reducing carbon emissions caused by incomplete combustion. Ammonia-blended combustion technology, as a novel clean and efficient combustion technology, has broad application prospects and development potential.

[0003] However, ammonia is difficult to ignite, has a high latent heat of vaporization, and a narrow ignition limit, which makes it difficult to ignite. Furthermore, it is difficult to ignite under conditions of low temperature and poor air-fuel ratio, resulting in a significant increase in unburned ammonia and nitrogen oxide emissions. Therefore, improving the mixing efficiency of ammonia and reducing the impact of the high latent heat of vaporization of ammonia on ammonia evaporation through preheating are the challenges of ammonia combustion.

[0004] Therefore, it is necessary to provide a new ammonia-coal combustion injection device to solve the above problems. Summary of the Invention

[0005] The technical problem solved by this invention is to provide an ammonia-coal combustion injection device that can rapidly preheat ammonia gas and improve the mixing efficiency of ammonia gas.

[0006] To solve the above-mentioned technical problems, the ammonia-coal combustion injection device provided by the present invention includes: a first injection mechanism and a second injection mechanism, the first injection mechanism and the second injection mechanism being located inside the furnace, the furnace having a first combustion zone and a second combustion zone, the first combustion zone and the second combustion zone being separated by a second partition and a sliding plate; both ends of the furnace are equipped with a first partition and a third partition with arc-shaped sidewalls, the third partition being inclinedly disposed inside the furnace; the first injection mechanism is installed at the top of the first combustion zone, the first injection mechanism including a second fixing ring, the second fixing ring being fixed inside the first combustion zone, the second fixing ring being threadedly connected to the first fixing ring, and the second fixing ring being threadedly connected to the first fixing ring. The system comprises: a first annular receiving cavity; an ammonia pipe installed on the side wall of a second fixing ring; a funnel-shaped first slit between the second fixing ring and the first fixing ring; and a first jet pipe installed at one end of the first fixing ring, whose inner side wall is arc-shaped. A second injection mechanism is installed inside the second combustion zone, including a fourth fixing ring fixed inside the second combustion zone. The fourth fixing ring is threadedly connected to a third fixing ring, and an annular second receiving cavity is provided between the fourth fixing ring and the third fixing ring. An air intake pipe is installed on the side wall of the fourth fixing ring, and a funnel-shaped second slit is provided between the fourth fixing ring and the third fixing ring. A second jet pipe is installed at one end of the third fixing ring, whose inner side wall is arc-shaped.

[0007] Preferably, the width of the first slit is different from the width of the second slit, and the widths of the first slit and the second slit are between 0.05 mm and 0.2 mm.

[0008] Preferably, one end of the second jet pipe is funnel-shaped, and the length of the second jet pipe is greater than the length of the first jet pipe.

[0009] Preferably, the interior of the second partition is provided with an air intake groove with an arc-shaped sidewall, and the center of the air intake of the air intake groove is aligned with the center of the second jet pipe.

[0010] Preferably, a funnel-shaped connecting groove is provided between the second partition and the slide plate, and the connecting groove is connected to the air outlet of the air inlet groove.

[0011] Preferably, the surface of the slide plate is inclined; inside the second combustion zone, one end of the slide plate is arc-shaped and located below the second partition.

[0012] Preferably, inside the first combustion zone, the bottom end of the second baffle is fitted with a protrusion with an inclined sidewall, and the top end of the second baffle is a quarter circle.

[0013] Preferably, the feed pipe is installed at an angle on one side of the furnace, and the bottom surface of the third partition above the feed pipe outlet is inclined upward; the feed pipe consists of an outer pipe and an inner pipe, the outer pipe conveys air, the inner pipe conveys pulverized coal, and the outlets of the outer pipe and the inner pipe are funnel-shaped.

[0014] Preferably, a plurality of collecting funnels are installed at the bottom of the furnace, and the furnace is located inside the boiler; an exhaust pipe is installed inside the boiler, and the exhaust pipe is connected to the second combustion zone inside the furnace.

[0015] Compared with related technologies, the ammonia-coal combustion injection device provided by the present invention has the following beneficial effects:

[0016] This invention provides an ammonia-coal combustion injection device. During the combustion of pulverized coal and ammonia gas in the first combustion zone, high-pressure ammonia gas stored in the ammonia tank rapidly enters the first receiving cavity through the ammonia gas pipe. As ammonia gas continuously enters the first receiving cavity, the gas pressure inside the first receiving cavity becomes relatively high, causing the ammonia gas to flow out at high speed from the first narrow slit. Under the influence of the Coanda effect, the high-speed airflow flowing out of the first narrow slit flows along the inner wall of the first fixed ring, which is shaped like a trumpet, and thus diffuses outward. Furthermore, according to Bernoulli's principle, the airflow flowing out of the first narrow slit, due to its velocity... The faster the flow, the lower the air pressure, creating a pressure difference with the surrounding air. This draws the high-temperature flue gas from one side of the second baffle into the interior of the second and first fixed rings. The airflow formed by the mixture of high-temperature flue gas and ammonia gas is rapidly ejected from the first jet pipe. As this airflow moves at the top of the first combustion zone, it similarly draws in the hot airflow from the top of the first combustion zone, filling the ammonia gas with high-temperature gas. This preheats the ammonia gas entering the first combustion zone, rapidly increasing its temperature and reducing the impact of the high latent heat of vaporization on ammonia evaporation. The airflow moving at the top of the first combustion zone contacts the third baffle, and the airflow travels along... The sidewall of the third baffle moves downward in an arc shape. At this time, oxygen and pulverized coal are sprayed upward at an angle through the feed pipe. The oxygen and pulverized coal come into contact with the airflow moving in an arc shape. The airflow impacts and collides with the oxygen and pulverized coal, causing them to mix rapidly and enter the airflow. This allows the ammonia, oxygen, and pulverized coal to mix evenly within the airflow and be heated by it. The airflow pushes the oxygen, pulverized coal, and ammonia towards the second baffle at the bottom of the first combustion zone. At this time, the first combustion zone is in a combustion state. The fully mixed ammonia, oxygen, and pulverized coal are rushed into the flame, causing the ammonia and pulverized coal to be quickly ignited and burn inside the first combustion zone. The high-temperature flue gas generated by combustion inside the first combustion zone moves towards the second baffle. The flue gas contacts the protrusion, and some of the flue gas moves upward along the side wall of the protrusion and enters the top of the second baffle, which facilitates the second fixing ring to draw in and heat the ammonia. At this time, the hot airflow in the first combustion zone continuously circulates and rotates, while driving the pulverized coal, ammonia, and oxygen to continuously rotate and burn in the first combustion zone, so that the pulverized coal and ammonia are fully burned inside the first combustion zone. At the same time, the gas flow rate inside the first combustion zone is increased. The high airflow velocity inside the first combustion zone helps to reduce NOx generation and reduce pollutants.Part of the flue gas generated inside the first combustion zone moves upward along the protrusion, while another part of the flue gas enters the interior of the second combustion zone. Similarly, the second injection mechanism inside the second combustion zone operates, driving the gas to rotate continuously within the second combustion zone. Air enters the second injection mechanism through the intake pipe, and after being mixed and heated with the accelerated hot airflow, it comes into contact with the flue gas entering the second combustion zone. Since the flue gas discharged from the first combustion zone contains unburned coal powder and ammonia, the unburned coal powder and ammonia mix and enter the rotating airflow inside the second combustion zone. Air is injected into this airflow, increasing the oxygen supply to the coal powder and ammonia, causing them to rotate and burn again within the second combustion zone. This ensures complete combustion of the coal powder and ammonia, reducing the amount of coal powder and ammonia in the flue gas and improving fuel utilization. Attached Figure Description

[0017] Figure 1 A schematic diagram of a preferred embodiment of the ammonia-coal combustion injection device provided by the present invention;

[0018] Figure 2 for Figure 1 The diagram shows the internal structure of the furnace.

[0019] Figure 3 for Figure 2 The diagram shows an enlarged view of the structure at point A.

[0020] Figure 4 for Figure 2 The diagram shows an enlarged view of the structure at point B.

[0021] Figure 5 for Figure 2 The diagram shows an enlarged view of the structure at point C.

[0022] Numbered in the diagram: 1. Boiler, 2. Exhaust pipe, 3. Feed pipe, 31. Outer pipe, 32. Inner pipe, 4. First injection mechanism, 41. Ammonia pipe, 42. First fixing ring, 43. First slit, 44. First jet pipe, 45. First receiving cavity, 46. Second fixing ring, 5. Second injection mechanism, 51. Air inlet pipe, 52. Third fixing ring, 53. Second slit, 54. Second jet pipe, 55. Second receiving cavity, 56. Fourth fixing ring, 6. Furnace, 61. Collection funnel, 62. First combustion zone, 63. Second combustion zone, 7. First baffle, 8. Second baffle, 81. Air inlet groove, 82. Protrusion, 83. Connecting groove, 9. Third baffle, 10. Slide plate, 11. Boiler igniter. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Please see Figures 1-5 , Figure 1 A schematic diagram of a preferred embodiment of the ammonia-coal combustion injection device provided by the present invention; Figure 2 for Figure 1 The diagram shows the internal structure of the furnace. Figure 3 for Figure 2 The diagram shows an enlarged view of the structure at point A. Figure 4 for Figure 2 The diagram shows an enlarged view of the structure at point B. Figure 5 for Figure 2 The diagram shows an enlarged view of the structure at point C. The ammonia-coal combustion injection device includes a first injection mechanism 4 and a second injection mechanism 5, located inside the furnace 6. The furnace 6 contains a first combustion zone 62 and a second combustion zone 63, separated by a second partition 8 and a sliding plate 10. At both ends of the furnace 6 are installed a first partition 7 and a third partition 9 with arc-shaped sidewalls. The third partition 9 is inclined inside the furnace 6. A feed pipe 3 is inclined on one side of the furnace 6, with the bottom surface of the third partition 9 above the outlet of the feed pipe 3 inclined upwards. The feed pipe 3 consists of an outer pipe 31 and an inner pipe 32. Air is transported inside the outer pipe 31, and pulverized coal is transported inside the inner pipe 32. The outlets of the outer pipe 31 and the inner pipe 32 are funnel-shaped. To facilitate the upward inclined spraying of pulverized coal and air, the pulverized coal and air move upwards along the bottom surface of the third partition 9 into the interior of the first combustion zone 62.

[0025] The first injection mechanism 4 is installed at the top of the first combustion zone 62. The first injection mechanism 4 includes a second fixing ring 46, which is fixed inside the first combustion zone 62. The second fixing ring 46 and the first fixing ring 42 are threaded together, and an annular first receiving cavity 45 is provided between the second fixing ring 46 and the first fixing ring 42. An ammonia pipe 41 is installed on the side wall of the second fixing ring 46. A funnel-shaped first slit 43 is provided between the second fixing ring 46 and the first fixing ring 42. A first injection pipe 44 is installed at one end of the first fixing ring 42, whose inner side wall is arc-shaped. During the combustion of pulverized coal and ammonia inside the first combustion zone 62, the high-pressure ammonia stored inside the ammonia tank quickly enters the interior of the first receiving cavity 45 through the ammonia pipe 41. As ammonia continuously enters the interior of the first receiving cavity 45, the gas pressure inside the first receiving cavity 45 becomes high, pushing... The ammonia gas will flow out at high speed from the first slit 43. Under the Coanda effect, the high-speed airflow from the first slit 43 will flow along the inner wall of the first fixed ring 42, which is shaped like a trumpet, and thus diffuse outward. According to Bernoulli's principle, the airflow from the first slit 43 has a low pressure due to its high speed, which will create a pressure difference with the surrounding air. This will draw the high-temperature flue gas from one side of the second partition 8 into the interior of the second fixed ring 46 and the first fixed ring 42. The airflow formed by the mixture of high-temperature flue gas and ammonia gas will be quickly ejected from the first jet pipe 44. When the airflow moves at the top of the first combustion zone 62, the hot airflow at the top of the first combustion zone 62 will be drawn into this airflow according to Bernoulli's principle. This will fill the ammonia gas with high-temperature gas, preheat the ammonia gas entering the interior of the first combustion zone 62, rapidly increase the temperature of the ammonia gas, and reduce the impact of the high latent heat of vaporization of ammonia on ammonia evaporation.The airflow moving at the top of the first combustion zone 62 contacts the third baffle 9. The airflow moves downward in an arc along the side wall of the third baffle 9. At this time, oxygen and pulverized coal are sprayed upward at an angle through the feed pipe 3. The oxygen and pulverized coal come into contact with the airflow moving in an arc. The airflow impacts and collides with the oxygen and pulverized coal, causing them to mix rapidly and enter the interior of the airflow. This allows the ammonia, oxygen, and pulverized coal to mix evenly inside the airflow and be heated by the airflow. The airflow pushes the oxygen, pulverized coal, and ammonia towards the second baffle 8 at the bottom of the first combustion zone 62. At this time, the first combustion zone 62 is in a combustion state. The fully mixed ammonia, oxygen, and pulverized coal are rushed into the flame, causing the ammonia and pulverized coal to be quickly ignited and burn inside the first combustion zone 62. The combustion inside the first combustion zone 62 produces High-temperature flue gas moves towards the second baffle 8, while the airflow simultaneously pushes the ammonia, pulverized coal, and high-temperature flue gas generated during combustion within the first combustion zone 62 towards the second baffle 8. Some of the flue gas, pulverized coal, and ammonia, due to the obstruction of the protrusion 82, move upwards along the sidewall of the protrusion 82 and enter the top of the second baffle 8, facilitating the second fixing ring 46 to draw them in and heat the ammonia. This causes the hot airflow in the first combustion zone 62 to continuously circulate and rotate, simultaneously driving the pulverized coal, ammonia, and oxygen to continuously rotate and burn within the first combustion zone 62. This ensures complete combustion of the pulverized coal and ammonia within the first combustion zone 62 and increases the gas flow rate within the first combustion zone 62. The high airflow velocity within the first combustion zone 62 helps reduce NOx formation and decrease pollutants.

[0026] The second injection mechanism 5 is installed inside the second combustion zone 63. The second injection mechanism 5 includes a fourth fixing ring 56, which is fixed inside the second combustion zone 63. The fourth fixing ring 56 is threadedly connected to a third fixing ring 52. An annular second receiving cavity 55 is provided between the fourth fixing ring 56 and the third fixing ring 52. An intake pipe 51 is installed on the side wall of the fourth fixing ring 56. A funnel-shaped second slit 53 is provided between the fourth fixing ring 56 and the third fixing ring 52. A second injection pipe 54 is installed at one end of the arc-shaped inner sidewall of the third fixing ring 52. The second partition 8... A funnel-shaped connecting groove 83 is provided between the slide plate 10 and the air inlet 81; the air inlet pipe 51 is connected to a high-pressure blower, which rapidly forces air into the interior of the second receiving cavity 55. The high-speed airflow from the second slit 53, under the Coanda effect, flows along the inner wall of the funnel-shaped third fixing ring 52 and diffuses outwards; then, according to Bernoulli's principle, suction is generated inside the fourth fixing ring 56, drawing the high-temperature flue gas from one side of the first partition 7 into the interior of the fourth fixing ring 56 and the third fixing ring 52, where the high-temperature flue gas mixes with the air. The airflow then passes through the interior of the second jet pipe 54, and the airflow ejected from the second jet pipe 54 draws the hot airflow from the top of the second combustion zone 63 into this airflow; one end of the second jet pipe 54 is funnel-shaped, and the length of the second jet pipe 54 is greater than the length of the first jet pipe 44, reducing the movement distance of the airflow ejected from the interior of the second jet pipe 54, making it easier for the airflow to rush into the interior of the air intake slot 81; the interior of the second partition plate 8 is provided with an air intake slot 81 with an arc-shaped sidewall, and the center of the air intake of the air intake slot 81 is aligned with the center of the second jet pipe 54; so that the airflow converges and amplifies inside the second jet pipe 54. After compression, the flow rate is maintained, and the airflow ejected from the second jet pipe 54 is concentrated, so that part of the airflow rushes into the interior of the air intake groove 81, and the other part of the airflow moves downward in an arc along the side wall of the second partition plate 8; the gas moves in an arc inside the air intake groove 81 and rushes into the interior of the connecting groove 83. At this time, the gas discharged from the first combustion zone 62 enters the interior of the connecting groove 83. The airflow ejected from the air intake groove 83 pushes the gas to quickly enter the interior of the second combustion zone 63, increasing the gas flow speed inside the connecting groove 83, thereby facilitating the rapid intake of the gas inside the first combustion zone 62 into the interior of the second combustion zone 63;The high-temperature gas entering the second combustion zone 63 mixes and impacts with the airflow moving along the sidewall of the second baffle 8, then moves to the bottom of the second combustion zone 63. Since the gas exiting the first combustion zone 62 contains unburned pulverized coal and ammonia, and a large amount of air is drawn in from the airflow moving along the sidewall of the second baffle 8 and heated by the airflow inside the second combustion zone 63, high-temperature oxygen is provided to the pulverized coal and ammonia. This causes the pulverized coal and ammonia to rotate and burn again inside the second combustion zone, ensuring complete combustion, reducing the amount of pulverized coal and ammonia in the flue gas, and improving fuel utilization. During the rotational combustion inside the second combustion zone 63, a small amount of flue gas moves upward along the sidewall of the first baffle 7, while a large amount of flue gas enters the interior of the exhaust pipe 2.

[0027] The width of the first slit 43 is different from the width of the second slit 53. The widths of the first slit 43 and the second slit 53 are between 0.05mm and 0.2mm. In order to change the width of the first slit 43 and the second slit 53 by rotating the first fixing ring 42 and the third fixing ring 52, thereby adjusting the suction force inside the second fixing ring 46 and the fourth fixing ring 56, the suction force inside the second fixing ring 46 is adjusted to the maximum to facilitate the rotation of the airflow inside the first combustion zone 62. The suction force inside the fourth fixing ring 56 is reduced so that the ratio between the flow rate of the gas inside the intake pipe 51 and the flow rate of the gas entering the fixing ring 56 is close to 1:1, thereby avoiding excessive smoke intake inside the second fixing ring 46, which would affect the combustion of pulverized coal and ammonia inside the second combustion zone 63.

[0028] The surface of the slide plate 10 is inclined. Inside the first combustion zone 62, a protrusion 82 with an inclined sidewall is installed at the bottom of the second partition plate 8, and the top of the second partition plate 8 is a quarter circle. In order to facilitate the upward movement of the flue gas, burning pulverized coal and ammonia gas rotating inside the first combustion zone 62 along the sidewall of the slide plate 10, part of the flue gas, pulverized coal and ammonia gas contact the protrusion 62 and enter the top of the second partition plate 8, so as to be sucked in by the second fixing ring 46. The other part of the flue gas, burning pulverized coal and ammonia gas enter the interior of the second combustion zone 62 along the slide plate 10.

[0029] Inside the second combustion zone 63, one end of the slide plate 10 is arc-shaped and located below the second partition plate 8. In order to facilitate the rotating airflow inside the second combustion zone 63 to push the flue gas, pulverized coal and ammonia downward on the side wall of the slide plate 8, change the direction of movement, and make the flue gas, pulverized coal and ammonia move at the bottom of the second combustion zone 63.

[0030] Multiple collection funnels 61 are installed at the bottom of the furnace 6 to facilitate the entry of dust inside the furnace 6 into the collection funnels 61; the furnace 6 is located inside the boiler 1, and a boiler igniter 11 is installed inside the furnace 6 to ignite ammonia and pulverized coal inside the furnace 6; a flue pipe 2 is installed inside the boiler 1, and the flue pipe 2 is connected to the second combustion zone 63 inside the furnace 6 to allow the smoke and dust generated inside the furnace 6 to be discharged through the flue pipe 2.

[0031] The working principle of the ammonia-coal combustion injection device provided by this invention is as follows: During the combustion of pulverized coal and ammonia gas inside the furnace 6, the high-pressure ammonia gas stored in the ammonia tank rapidly enters the first receiving cavity 45, and the high-pressure blower rapidly injects air into the second receiving cavity 55. The ammonia gas inside the first receiving cavity 4 flows out from the first slit 43, generating a high-speed airflow that flows along the inner wall of the first fixed ring 42, which is shaped like a trumpet, and diffuses outward. According to Bernoulli's principle, suction is generated inside the second fixed ring 46, drawing the high-temperature flue gas from one side of the second partition 8 into the second fixed ring 46 and the first fixed ring 42. The airflow formed by the mixture of high-temperature flue gas and ammonia gas is rapidly ejected from the first injection pipe 44. When the airflow moves at the top of the first combustion zone 62, similarly according to Bernoulli's principle, the hot airflow at the top of the first combustion zone 62 is drawn into this airflow, filling the ammonia gas with high-temperature gas. The ammonia gas entering the first combustion zone 62 is preheated to rapidly increase its temperature and reduce the impact of the high latent heat of vaporization on ammonia evaporation. The airflow moving at the top of the first combustion zone 62 contacts the third baffle 9 and moves downwards in an arc along the side wall of the third baffle 9. At this time, oxygen and pulverized coal are continuously sprayed upwards through the feed pipe 3 into the furnace 6. The oxygen and pulverized coal contact the arc-moving airflow, causing them to impact and collide, rapidly mixing and entering the airflow. This ensures that the ammonia, oxygen, and pulverized coal are uniformly mixed and heated within the airflow. The airflow propels the oxygen, pulverized coal, and ammonia in the first combustion zone 62. The bottom end moves towards the second baffle 8. At this time, the first combustion zone 62 is in a combustion state. The fully mixed ammonia, oxygen, and coal powder are rushed into the flame, causing the ammonia and coal powder to be quickly ignited and burn inside the first combustion zone 62. At the same time, the airflow pushes the ammonia, coal powder, and high-temperature flue gas generated by combustion inside the first combustion zone 62 towards the second baffle 8. The rotating flue gas, burning coal, and ammonia inside the first combustion zone 62 move upward along the inclined side wall of the slide plate 10. Some of the flue gas, coal powder, and ammonia are blocked by the protrusion, causing them to contact the protrusion 62 and enter the top of the second baffle 8. The second fixing ring 46 facilitates the intake of the flue gas, pulverized coal and ammonia during the combustion process, while the other part enters the interior of the connecting groove 83 along the slide plate 10. The ammonia, pulverized coal and flue gas entering the top of the second baffle 8 are drawn in by the second fixing ring 46 to heat the ammonia, causing the hot airflow in the first combustion zone 62 to circulate continuously. At the same time, it drives the pulverized coal, ammonia and oxygen to rotate and burn continuously in the first combustion zone 62, so that the pulverized coal and ammonia are fully burned inside the first combustion zone 62. At the same time, it increases the gas flow rate inside the first combustion zone 62. The high airflow velocity inside the first combustion zone 62 helps to reduce NOx generation and reduce pollutants.When air rushes into the second receiving cavity 55, the high-speed airflow flowing out from the second slit 53 creates suction inside the fourth fixing ring 56, drawing the high-temperature flue gas from one side of the first partition 7 into the fourth fixing ring 56 and the third fixing ring 52. The high-temperature flue gas mixes with the air to form an airflow that passes through the second jet pipe 54. The airflow ejected from the second jet pipe 54 draws the hot airflow from the top of the second combustion zone 63 into this airflow. The airflow contacts the surface of the second baffle 8, with part of the airflow entering the air inlet groove 81 and the other part moving downwards in an arc along the side wall of the second partition 8. The gas moves in an arc inside the air inlet groove 81 and rushes into the connecting groove 83. At this time, the flue gas, pulverized coal, and ammonia discharged from the first combustion zone 62 enter the connecting groove 83. The airflow ejected from the air inlet groove 83 pushes the flue gas rapidly into the second combustion zone 63, increasing the gas flow speed inside the connecting groove 83, thereby facilitating the rapid removal of the flue gas, pulverized coal, and ammonia from the first combustion zone 62. The flue gas, pulverized coal, and ammonia are rapidly drawn into the second combustion zone 63. The flue gas, pulverized coal, and ammonia entering the second combustion zone 63 mix and impact with the airflow moving along the sidewall of the second partition 8, then move at the bottom of the second combustion zone 63. Since the gas exiting the first combustion zone 62 contains unburned pulverized coal and ammonia, and a large amount of air is drawn into the airflow moving along the sidewall of the second partition 8 and heated by the airflow inside the second combustion zone 63, high-temperature oxygen is provided to the pulverized coal and ammonia, allowing the pulverized coal and ammonia to burn more efficiently in the second combustion zone. The combustion zone rotates again, allowing the pulverized coal and ammonia to burn fully, reducing the amount of pulverized coal and ammonia in the flue gas and improving fuel utilization. When the gas inside the second combustion zone 63 rotates to the end of the furnace 6 and moves upward, a small portion of the gas runs along the arc-shaped second baffle 9 on the side wall and is drawn in by the fourth fixing ring 56. This portion of the flue gas rotates again inside the second combustion zone 62, further reducing the content of pulverized coal and ammonia in the flue gas. The other portion of the flue gas moves upward inside the furnace 6 and is discharged through the exhaust pipe 2.During the operation of the first injection mechanism 4 and the second injection mechanism 5, nitrogen and air continuously enter and carry away the heat inside the first injection mechanism 4 and the second injection mechanism 5, preventing the temperature of the first injection mechanism 4 and the second injection mechanism 5 from becoming too high; and by rotating the first fixing ring 42 and the third fixing ring 52, the width of the first slit 43 and the second slit 53 is changed to adjust the suction force inside the second fixing ring 46 and the fourth fixing ring 56. The suction force inside the second fixing ring 46 is adjusted to the maximum, which facilitates the driving of the first combustion zone 62. As the airflow rotates, the suction inside the fourth fixing ring 56 is reduced, making the ratio between the gas velocity inside the intake pipe 51 and the gas velocity entering the fixing ring 56 approximately 1:1. This prevents excessive flue gas from being drawn into the second fixing ring 46, thus avoiding excessive flue gas affecting the combustion of pulverized coal and ammonia in the second combustion zone 63. After the slit adjustment is completed, the connection between the first fixing ring 42 and the second fixing ring 46, and the connection between the third fixing ring 52 and the fourth fixing ring 46 are welded and fixed to prevent loosening and air leakage.

[0032] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An ammonia-coal combustion injection device, characterized in that, include: The first injection mechanism (4) and the second injection mechanism (5) are located inside the furnace (6). The furnace (6) is provided with a first combustion zone (62) and a second combustion zone (63). The first combustion zone (62) and the second combustion zone (63) are separated by a second partition (8) and a sliding plate (10). Both ends of the furnace (6) are equipped with a first partition (7) and a third partition (9) with arc-shaped sidewalls. The third partition (9) is inclined inside the furnace (6). The first injection mechanism (4) is installed at the top of the first combustion zone (62). The first injection mechanism (4) includes a second fixing ring (46), which is fixed inside the first combustion zone (62). The second fixing ring (46) is threadedly connected to the first fixing ring (42). An annular first receiving cavity (45) is provided between the second fixing ring (46) and the first fixing ring (42). An ammonia pipe (41) is installed on the side wall of the second fixing ring (46). A funnel-shaped first slit (43) is provided between the second fixing ring (46) and the first fixing ring (42). A first injection pipe (44) is installed at one end of the first fixing ring (42) whose inner side wall is arc-shaped. The second injection mechanism (5) is installed inside the second combustion zone (63). The second injection mechanism (5) includes a fourth fixing ring (56), which is fixed inside the second combustion zone (63). The fourth fixing ring (56) is threadedly connected to the third fixing ring (52). An annular second receiving cavity (55) is provided between the fourth fixing ring (56) and the third fixing ring (52). An air intake pipe (51) is installed on the side wall of the fourth fixing ring (56). A funnel-shaped second slit (53) is provided between the fourth fixing ring (56) and the third fixing ring (52). A second jet pipe (54) is installed at one end of the arc-shaped inner side wall of the third fixing ring (52).

2. The ammonia-coal combustion injection device according to claim 1, characterized in that, The width of the first slit (43) is different from the width of the second slit (53), and the widths of the first slit (43) and the second slit (53) are between 0.05 mm and 0.2 mm.

3. The ammonia-coal combustion injection device according to claim 1, characterized in that, One end of the second jet pipe (54) is funnel-shaped, and the length of the second jet pipe (54) is greater than the length of the first jet pipe (44).

4. The ammonia-coal combustion injection device according to claim 3, characterized in that, The interior of the second partition (8) is provided with an air inlet groove (81) with an arc-shaped sidewall, and the center of the air inlet of the air inlet groove (81) is aligned with the center of the second jet pipe (54).

5. The ammonia-coal combustion injection device according to claim 4, characterized in that, A funnel-shaped connecting groove (83) is provided between the second partition (8) and the slide plate (10), and the connecting groove (83) is connected to the air outlet of the air inlet groove (81).

6. The ammonia-coal combustion injection device according to claim 5, characterized in that, The surface of the slide plate (10) is inclined; inside the second combustion zone (63), one end of the slide plate (10) is arc-shaped and located below the second partition (8).

7. The ammonia-coal combustion injection device according to claim 6, characterized in that, Inside the first combustion zone (62), a protrusion (82) with an inclined sidewall is installed at the bottom of the second partition (8), and the top of the second partition (8) is a quarter circle.

8. The ammonia-coal combustion injection device according to claim 1, characterized in that, The feed pipe (3) is installed at an angle on one side of the furnace (6), and the bottom surface of the third partition (9) above the outlet of the feed pipe (3) is inclined upward; the feed pipe (3) is composed of an outer pipe (31) and an inner pipe (32), the outer pipe (31) conveys air, the inner pipe (32) conveys coal powder, and the outlets of the outer pipe (31) and the inner pipe (32) are funnel-shaped.

9. The ammonia-coal combustion injection device according to claim 1, characterized in that, Multiple collection funnels (61) are installed at the bottom of the furnace (6). The furnace (6) is located inside the boiler (1). A boiler igniter (11) is installed inside the furnace (6). A flue pipe (2) is installed inside the boiler (1), and the flue pipe (2) is connected to the second combustion zone (63) inside the furnace (6).

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