CN112944383A - Cyclone burner and system thereof - Google Patents

Abstract

The application provides a cyclone burner and system thereof, the device includes: the first air pipe is provided with an inlet and an outlet and is used for inputting primary air into the hearth; the second air pipe is sleeved outside the first air pipe; an annular space is formed between the second air pipe and the first air pipe; a partition disposed within the annular space, the partition dividing the annular space into a third air duct distal from the first air duct and a second air duct located between the first air duct and the third air duct; the second air duct is used for inputting secondary air into the hearth; the cross-sectional area of the third air duct is gradually reduced from the inlet to the outlet to form a spray pipe; one end of the third air duct close to the inlet is annular; and one end of the third air duct close to the outlet is semi-annular. The embodiment of the application provides a cyclone burner capable of effectively inhibiting high-temperature corrosion of a boiler hearth side wall and a system thereof.

Description

Cyclone burner and system thereof

Technical Field

The present application relates to a cyclone burner and a system thereof.

Background

At present, many utility boilers employ opposed firing systems. The opposed firing system includes swirl burners mounted on the front and rear walls of the furnace. When the cyclone burner works, the pulverized coal in the central area is vigorously combusted, and a large amount of oxygen supply outside the entrainment flame is needed, so that the area near the flame of the burner is generally in an anoxic state. The side wall of the hearth is not supplied with air, and a large amount of reducing gases such as CO and H generated by incompletely combusted pulverized coal are generated₂S is extruded to the side wall, and then a reducing atmosphere is formed in the area. Therefore, the side wall of the hearth is easy to generate high-temperature corrosion, and great potential safety hazard is caused to the operation of the boiler.

In the prior art, the formation of the side wall reductive atmosphere can be improved by adopting wall-attached wind. Specifically, the air jet device is firstly installed on the surface of the side wall. The air injection device blows air towards the side wall, so that an air film can be formed on the surface of the side wall. The air film can isolate the side wall and the reducing gas, so that the air film can improve the reducing atmosphere. However, the wind direction of the air injection device in the prior art is perpendicular to the surface of the side wall, so that the wind speed is attenuated quickly, the side wall cannot be covered completely due to insufficient rigidity, the side wall is easy to scour, and the abrasion of the side wall is accelerated. In addition, after the wall-attached air duct is added, the flow acting on the combustor is relatively reduced, and under the same air supply pressure, the pressure of the secondary air box is correspondingly reduced, so that pulverized coal of the combustor can not be fully combusted, the boiler efficiency is reduced, and the formation of the reducing atmosphere in the hearth is promoted.

Therefore, it is necessary to provide a cyclone burner and a system thereof to solve the above problems.

Disclosure of Invention

In view of this, the embodiment of the application provides a cyclone burner and a system thereof, which can effectively inhibit the high-temperature corrosion of the side wall of a boiler furnace.

In order to achieve the purpose, the application provides the following technical scheme: a cyclone burner comprising: the first air pipe is provided with an inlet and an outlet and is used for inputting primary air into the hearth; the second air pipe is sleeved outside the first air pipe; an annular space is formed between the second air pipe and the first air pipe; a partition disposed within the annular space, the partition dividing the annular space into a third air duct distal from the first air duct and a second air duct located between the first air duct and the third air duct; the second air duct is used for inputting secondary air into the hearth; the cross-sectional area of the third air duct is gradually reduced from the inlet to the outlet to form a spray pipe.

In a preferred embodiment, an end of the third air duct near the inlet is annular; and one end of the third air duct close to the outlet is semi-annular.

As a preferred embodiment, the separator is a pipe body, and the pipe body is sleeved outside the first wind pipe; the second air pipe is sleeved outside the pipe body.

In a preferred embodiment, the third air duct extends obliquely outward in the direction from the inlet to the outlet in an axial cross section.

As a preferred embodiment, an included angle between the third air duct and the axial direction of the first air duct is 6 degrees to 12 degrees.

As a preferred embodiment, one end of the second air duct close to the inlet is connected with a draft tube; the drainage tube is communicated with the annular space; and the secondary air is used for inputting secondary air into the third air duct and the second air duct.

As a preferred embodiment, a baffle for adjusting the air flow in the third air duct and the second air duct is disposed in the draft tube.

A cyclone combustion system is used for a hearth, and the hearth comprises a front water-cooled wall, a rear water-cooled wall and at least one side water-cooled wall positioned between the front water-cooled wall and the rear water-cooled wall; the swirl flow combustion system comprises: at least one combustion unit; corresponding to at least one of the side water-cooled walls; the combustion unit comprises two cyclone combustors; the two cyclone burners are respectively arranged on the front water-cooled wall and the rear water-cooled wall; and the third air channels of the two cyclone burners are opened towards the corresponding side water-cooling walls, so that the airflow in the third air channels can flow towards the corresponding side water-cooling walls.

As a preferred embodiment, the method further comprises: at least one cyclonic combustion device; the front water-cooled wall and/or the rear water-cooled wall are/is arranged on the front water-cooled wall and/or the rear water-cooled wall; the cyclone combustion device comprises a first air pipe, a second air pipe and a cyclone combustion device, wherein the first air pipe is provided with an inlet and an outlet and is used for inputting primary air to the hearth; the cyclone combustion device is arranged on one side of the cyclone combustor, which is far away from the side water-cooling wall.

As a preferred embodiment, an included angle is formed between the third air duct of the cyclone burner and the axial direction of the first air duct; so that the air flows in the third air ducts of the two cyclone burners can converge when the air flows do not contact the side water-cooled wall.

By means of the technical scheme, the cyclone burner and the system thereof provided by the embodiment of the application are provided with the first air pipe, the second air pipe and the partition piece, and the cross-sectional area of the third air channel is gradually reduced from the inlet to the outlet to form the spray pipe; therefore, the airflow in the third air duct flows in the direction from the inlet to the outlet and has high rigidity when being ejected. The airflow with strong rigidity can strongly inhibit the accumulation of reducing gas on the water-cooling wall at the side of the hearth, and can increase the oxygen content of the water-cooling wall at the side of the hearth, thereby effectively avoiding the formation of reducing atmosphere in the water-cooling wall area at the side of the hearth. Therefore, the embodiment of the application provides the cyclone burner and the system thereof, which can effectively inhibit the high-temperature corrosion of the side wall of the boiler hearth.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for assisting the understanding of the present application, and are not particularly limited to the shapes, the proportional sizes, and the like of the respective members in the present application. Those skilled in the art, having the benefit of the teachings of this application, may select various possible shapes and proportional sizes to implement the present application, depending on the particular situation. In the drawings:

FIG. 1 is a schematic diagram of an arrangement of a cyclonic combustion system according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of an arrangement of a cyclone combustion system on a front water wall according to an embodiment of the present application;

FIG. 3 is a schematic view of an outlet end of a cyclone burner according to an embodiment of the present application;

FIG. 4 is a schematic flow path diagram of a cyclone burner according to an embodiment of the present disclosure;

fig. 5 is a wind direction diagram of the swirling combustion system in the furnace according to the embodiment of the present application.

Description of reference numerals:

11. a first air duct; 12. an inlet; 13. an outlet; 14. a second air duct; 15. a separator; 17. a third air duct; 19. a second air duct; 21. a first air duct; 29. a drainage tube; 31. a baffle plate; 33. a front water wall; 35. a rear water-cooled wall; 37. a side water-cooled wall; 39. a cyclone burner; 41. a swirling flow combustion device; 43. a combustion chamber; 45. a flow equalizing cylinder; 47. a swirl vane; 49. and (4) a hearth.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Referring to fig. 3 and 4, the present embodiment provides a cyclone burner 39, which includes: a first duct 11 having an inlet 12 and an outlet 13 for feeding primary air into the furnace 49; the second air pipe 14, the second air pipe 14 is sleeved outside the first air pipe 11; an annular space is formed between the second air duct 14 and the first air duct 11; a partition 15 disposed in the annular space, wherein the partition 15 divides the annular space into a third air duct 17 far from the first air duct 11 and a second air duct 19 between the first air duct 11 and the third air duct 17; the second air duct 19 is used for inputting secondary air into the hearth 49; the cross-sectional area of the third air duct 17 becomes smaller from the inlet 12 to the outlet 13 to form a nozzle.

According to the scheme, the cyclone burner provided by the embodiment of the application is provided with the first air duct 11, the second air duct 14 and the partition 15, and the cross sectional area of the third air duct 17 is gradually reduced from the inlet 12 to the outlet 13 to form a spray pipe; the airflow in the third air duct 17 is thus rigid when flowing in the direction from the inlet 12 to the outlet 13 and emitted. The gas flow with strong rigidity can strongly inhibit the accumulation of reducing gas on the water-cooling wall 37 at the side of the hearth 49, and can also increase the oxygen content of the water-cooling wall 37 at the side of the hearth 49, thereby effectively avoiding the formation of reducing atmosphere in the area of the water-cooling wall 37 at the side of the hearth 49.

As shown in fig. 1, the furnace 49 according to the present embodiment is a boiler furnace 49. The boiler furnace 49 has a combustion chamber 43 for the combustion of pulverized coal. Specifically, as shown in fig. 1, for example, the furnace 49 has an internally hollow structure as a whole. The hollow portion forms a combustion chamber 43. Further, the furnace 49 includes a front waterwall 33, a rear waterwall 35, and at least one side waterwall 37 between the front waterwall 33 and the rear waterwall 35. For example, as shown in FIG. 1, the furnace 49 includes two side water cooled walls 37. Specifically, the two side water-cooled walls 37 include the left side water-cooled wall 37 and the right side water-cooled wall 37. And the front water-cooled wall 33, the rear water-cooled wall 35 and the two side water-cooled walls 37 enclose a combustion chamber 43.

Further, the cyclone burner according to the embodiment of the present application is disposed on the front water wall 33 or the rear water wall 35 of the furnace 49, thereby forming a counter-flow combustion system. Specifically, the cyclone burner on the front water-cooled wall 33 corresponds to the cyclone burner on the rear water-cooled wall 35, and then the cyclone burner on the front water-cooled wall 33 and the corresponding cyclone burner on the rear water-cooled wall 35 can input primary air and secondary air into the combustion chamber 43 in opposite directions, so that pulverized coal is combusted in the combustion chamber 43. This correspondence may be such that the number of cyclone burners on the front water wall 33 is equal to the number of cyclone burners on the rear water wall 35. For example, FIG. 5 shows a top view of the furnace 49. As can be seen from fig. 5, there are 8 swirl burners on the front water wall 33. The number of the cyclone burners on the rear water wall 35 is 8. Of course, the number of the cyclone burners on the front water wall 33 and the rear water wall 35 is not limited to 8. This application is not intended to be limited thereto. The cyclone burner on the front water wall 33 inputs gas upwards, and the cyclone on the rear water wall 35 inputs gas downwards, so that a hedging combustion system is formed. Further, the cyclone burner according to the embodiment of the present application may be fixed to the front water wall 33 or the rear water wall 35 of the furnace 49. The fixing method may be, for example, screw fixing, bolt fixing, welding fixing, or the like.

In the present embodiment, the first duct 11 is used to introduce primary air into the furnace 49. The primary air is air that is fed into the furnace 49 together with the pulverized coal when the pulverized coal is burned. The primary air is mainly used for providing air for the combustion of the furnace 49 according to oxygen required in the combustion process of the pulverized coal in the furnace 49, and also has the function of cooling a fire grate. Specifically, the first duct 11 has an angle different from 0 degree or 180 degrees with the surface of the front water wall 33 or the rear water wall 35. Preferably, the angle between the first air duct 11 and the surface of the front water wall 33 or the rear water wall 35 is 90 degrees. That is, the first air duct 11 is disposed perpendicular to the surface of the front water wall 33 or the rear water wall 35. Specifically, the front water wall 33 or the rear water wall 35 is provided with openings. The first air duct 11 is disposed through the opening. Further, a first air duct 21 for circulating the primary air is formed in the first air duct 11. For example, as shown in fig. 4, the first air duct 11 extends left and right. The first air duct 21 extends left and right. Further, the first ductwork 11 has an inlet 12 and an outlet 13. Specifically, the first air duct 21 is provided with an inlet 12 and an outlet 13 at both ends thereof, respectively. For example, as shown in fig. 4, the left end of the first air duct 21 is the inlet 12. The right end of the first air duct 21 is an outlet 13. So that the primary wind energy flows into the first wind tunnel 21 from the inlet 12 and flows out of the first wind tunnel 21 from the outlet 13. Further, the outlet 13 is opened toward the combustion chamber 43 so that primary wind energy is input into the combustion chamber 43 through the outlet 13.

In the present embodiment, the second duct 14 is sleeved outside the first duct 11. Further, an annular space is formed between the second air duct 14 and the first air duct 11. Further, a partition 15 is provided in the annular space. As shown in fig. 4, for example, the separator 15 is a tube. Further, the partition 15 divides the annular space into a third air passage 17 remote from the first air duct 11 and a second air passage 19 between the first air duct 11 and the third air passage 17. For example, as shown in fig. 4, the tube body is sleeved outside the first air duct 11. The second air pipe 14 is sleeved outside the pipe body. Such that the first duct 11 and the third duct 17 are located innermost and outermost, respectively. The second air duct 19 is located at an intermediate position. The second duct 19 is used for supplying secondary air into the furnace 49. The secondary air is used for providing oxygen for the pulverized coal.

Further, the cross-sectional area of the third air duct 17 becomes smaller from the inlet 12 to the outlet 13 to form a nozzle. The airflow in the third air duct 17 is thus rigid when emitted in the direction from the inlet 12 to the outlet 13. The gas flow with strong rigidity can strongly inhibit the accumulation of reducing gas on the water-cooling wall 37 at the side of the hearth 49, and can also increase the oxygen content of the water-cooling wall 37 at the side of the hearth 49, thereby effectively avoiding the formation of reducing atmosphere in the area of the water-cooling wall 37 at the side of the hearth 49. For example, as shown in fig. 5, the third air duct 17 of the leftmost cyclone burner is open to the left water-cooled wall, so that the air flow is rigid when being ejected from the third air duct 17 to the left side water-cooled wall 37 along the direction from the inlet 12 to the outlet 13, and an air barrier is formed on the left side water-cooled wall 37; therefore, the diffusion of the reducing cyclone gas generated by combustion to the left side water-cooling wall 37 can be effectively inhibited, the adverse effect of the reducing gas generated by combustion of the cyclone burner on the left side water-cooling wall 37 is reduced, and the high-temperature corrosion phenomenon of the furnace 49 side water-cooling wall 37 is relieved. Meanwhile, the third air duct 17 is positioned outside the flame, and can also provide oxygen for combustion, so that the combustion is more sufficient. Further, one end of the third air duct 17 close to the inlet 12 is annular; the end of the third air duct 17 near the outlet 13 is semi-annular. For example, as shown in fig. 3, the left end of the third air duct 17 is annular; the right end of the third air duct 17 is semi-annular. And then the cross-sectional area of third wind channel 17 diminishes gradually from the left end to the right end and forms the spray tube, and makes the air current in third wind channel 17 form asymmetric perimeter wind.

Further, the flame at the outlet 13 of the first air duct 11 will spread to some extent; in order to avoid impingement on the swirling flame and to ensure combustion stability, the third air duct 17 extends obliquely outward in the direction from the inlet 12 to the outlet 13 in axial cross section. Preferably, the included angle between the third air duct 17 and the axial direction of the first air duct 11 is 6 degrees to 12 degrees. For example, as shown in fig. 4, the axial direction of the first duct 11 is the left-right direction. The extending direction of the third air duct 17 is inclined upward in the left-to-right direction. Thus, when the flame at the outlet 13 of the first air duct 11 spreads upward in the right direction, the third air duct 17 can avoid the impact on the swirling flame. Further, as shown in fig. 5, the axial direction of the first duct 11 is the vertical direction. And the axial direction of the first ductwork 11 is perpendicular to the front waterwall 33 and the rear waterwall 35. The extending direction of the third air duct 17 is inclined to the left in the direction from the bottom to the top. Thus, when the flame at the outlet 13 of the first air duct 11 spreads to the left in the upward direction, the third air duct 17 can avoid the impact on the swirling flame. That is, the third air duct 17 can reduce the flow cross section of the asymmetric peripheral air, enhance the rigidity of the asymmetric peripheral air at the outlet of the third air duct 17, and change the flow direction of the asymmetric peripheral air, so that the asymmetric peripheral air flows towards the side water-cooling wall 37 at a certain angle, thereby avoiding the interference to the swirling flame.

Further, a draft tube 29 is connected to an end of the second duct 14 adjacent the inlet 12. For example, as shown in FIG. 4, the right end of draft tube 29 is connected to the left end of second duct 14. The connection mode can be screw connection, bolt connection, welding, integral forming and the like. Further, the draft tube 29 communicates with the annular space. The draft tube 29 is used for inputting secondary air into the third air duct 17 and the second air duct 19. Further, a baffle 31 for adjusting the air flow in the third air duct 17 and the second air duct 19 is provided in the draft tube 29. The baffle 31 is connected to the partition 15, as shown in fig. 4, for example. Thus, the air in the third air duct 17 belongs to the secondary air. The secondary air can form a branch flow in the draft tube 29 through the baffle 31, one flow enters the second air duct 19 to form a rotational flow to promote combustion, and the other flow enters the third air duct 17 to relieve high-temperature corrosion. In this way, the cyclone burner according to the embodiment of the present application is easy to implement. Specifically, the asymmetric peripheral wind is a branch wind separated from the secondary wind, and can be reconstructed on the original combustor equipment without adding additional pipelines and equipment. And the cyclone burner of the embodiment of the application can not cause interference to combustion. Specifically, the asymmetric peripheral wind is a strand separated from the primary secondary wind, and is blown to the side water-cooling wall 37 at a certain angle outside the swirling burner, and only plays a role in providing oxygen required for combustion and inhibiting diffusion of reducing gas to the side water-cooling wall 37, and does not impact flame of the swirling burner to influence combustion.

Further, a flow equalizing cylinder 45 is arranged in each of the second air duct 19 and the third air duct 17. The flow equalizing cylinder 45 can make the sprayed secondary air and the asymmetric peripheral air uniformly enter the respective flow passages in a circular flow mode. Further, one end of the second air duct 19 near the outlet 13 is provided with a swirl vane 47. The swirl vanes 47 can make the secondary air form swirl to entrain the low-temperature flue gas outside the flame to promote combustion.

Please refer to fig. 1 and 5. The embodiment of this application still provides a cyclone combustion system, and it includes: at least one combustion unit; corresponding to at least one of said side water-cooled walls 37; the combustion unit comprises two cyclone burners 39 as described above; the two cyclone burners 39 are respectively arranged on the front water-cooled wall 33 and the rear water-cooled wall 35; and the third air ducts 17 of the two cyclone burners 39 are both opened towards the corresponding side water-cooled wall 37, so that the air flow in the third air ducts 17 can flow towards the corresponding side water-cooled wall 37.

As can be seen from the above solutions, the swirling combustion system according to the embodiment of the present application is provided with a combustion unit, which includes two swirling burners 39, such that on one hand, the two swirling burners 39 form opposed combustion, and on the other hand, the third air duct 17 of the swirling burners 39 is open toward the corresponding side water-cooled wall 37, and the cross-sectional area gradually decreases from the inlet 12 to the outlet 13 to form a nozzle; the airflow in the third air duct 17 is thus rigid when flowing in the direction from the inlet 12 to the outlet 13 and emitted. The gas flow with strong rigidity can strongly inhibit the accumulation of reducing gas on the water-cooling wall 37 at the side of the hearth 49, and can also increase the oxygen content of the water-cooling wall 37 at the side of the hearth 49, thereby effectively avoiding the formation of reducing atmosphere in the area of the water-cooling wall 37 at the side of the hearth 49.

In the present embodiment, the combustion unit includes two swirl burners 39 as described above. That is, the cyclone burner 39 comprises a first ducted duct 11 having an inlet 12 and an outlet 13 for feeding primary air into the furnace 49; the first air duct 11 is arranged in the second air duct 14 in a penetrating manner; an annular space is formed between the second air duct 14 and the first air duct 11; a partition 15 disposed in the annular space, wherein the partition 15 divides the annular space into a third air duct 17 far from the first air duct 11 and a second air duct 19 between the first air duct 11 and the third air duct 17; the second air duct 19 is used for inputting secondary air into the hearth 49; the cross-sectional area of the third air duct 17 becomes smaller from the inlet 12 to the outlet 13 to form a nozzle. Further, the combustion unit includes two cyclone burners 39 disposed on the front water wall 33 and the rear water wall 35, respectively. For example, as shown in fig. 1, 2, and 5, the leftmost cyclone burner of the front water wall 33 is a cyclone burner 39. The leftmost cyclone burner of the rear water wall 35 is a cyclone burner 39. The leftmost cyclone burner 39 of the front water wall 33 and the rear water wall 35 constitute a combustion unit.

In the present embodiment, at least one combustion unit corresponds to at least one side water-cooled wall 37. This correspondence may be such that the number of combustion units is equal to the number of side water-cooled walls 37. Correspondingly, the position of the combustion unit may be close to the position of the side water-cooled wall 37. For example, as shown in FIG. 1, the furnace 49 includes a left side water cooled wall 37 and a right side water cooled wall. I.e. the furnace 49 comprises two side water-cooled walls 37. The combustion unit includes a left combustion unit and a right combustion unit. I.e. two combustion units. And the left combustion unit is adjacent to the left side water cooled wall 37. The right combustion unit is adjacent to the right side water cooled wall 37.

Further, the third air ducts 17 of both the cyclone burners 39 are open to the corresponding side water-cooled wall 37, so that the air flow in the third air ducts 17 can flow toward the corresponding side water-cooled wall 37. That is, the third air passage 17 of the swirling burner 39 of the left combustion unit is opened toward the left side water-cooled wall 37, so that the air flow in the third air passage 17 can flow toward the left side water-cooled wall 37. The third air duct 17 of the swirling burner 39 of the right-hand combustion unit is open toward the right-hand side water-cooled wall 37, so that the air flow in the third air duct 17 can flow toward the right-hand side water-cooled wall 37. Thus, the rigidity of the secondary air is effectively increased through the asymmetric peripheral air of the cyclone burner 39, the reducing atmosphere in the area of the side water-cooled wall 37 on the left side of the hearth 49 is improved through the left-side combustion unit, and the problems of poor wall-attached air rigidity and easy abrasion are avoided; the combustion unit on the right improves the reducing atmosphere in the area of the water cooling wall 37 on the right side of the hearth 49, and avoids the problems of poor wall-adhering wind rigidity and easy abrasion.

Further, the swirling combustion system according to the embodiment of the present application further includes: at least one cyclonic combustion device 41. The at least one may be 1, 2, 3, 4, etc. The cyclone combustion device 41 is arranged on the front water wall 33 and/or the rear water wall 35. The swirling-flow combustion device 41 injects primary air into the furnace 49. Specifically, the swirling combustion device 41 includes a first duct 11. The first ductwork 11 has an inlet 12 and an outlet 13. The first duct 11 is used to supply primary air to the furnace 49. The primary air is air that is fed into the furnace 49 together with the pulverized coal when the pulverized coal is burned. The primary air is mainly used for providing air for the combustion of the furnace 49 according to oxygen required in the combustion process of the pulverized coal in the furnace 49, and also has the function of cooling a fire grate. Specifically, the first duct 11 is a first duct 11. The first air duct 11 is at an angle different from 0 degrees or 180 degrees with respect to the surface of the front water wall 33 or the rear water wall 35. Preferably, the angle between the first air duct 11 and the surface of the front water wall 33 or the rear water wall 35 is 90 degrees. That is, the first air duct 11 is disposed perpendicular to the surface of the front water wall 33 or the rear water wall 35. Specifically, the front water wall 33 or the rear water wall 35 is provided with openings. The first air duct 11 is disposed through the opening. Further, a first air duct 21 for circulating the primary air is formed in the first air duct 11. Further, the first ductwork 11 has an inlet 12 and an outlet 13. Specifically, the first air duct 21 is provided with an inlet 12 and an outlet 13 at both ends thereof, respectively. Further, the outlet 13 is opened toward the combustion chamber 43 so that primary wind energy is input into the combustion chamber 43 through the outlet 13. Further, the cyclone burner 41 further comprises a second air duct 14. The first air duct 11 is disposed through the second air duct 14. An annular space is formed between the second air duct 14 and the first air duct 11. The annular space is used for inputting secondary air into the furnace 49. The secondary air is used for providing oxygen for the pulverized coal.

Further, the cyclone burner 41 is provided on the side of the cyclone burner 39 remote from the side water-cooled wall 37. For example, as shown in fig. 5, the cyclone burner 41 is provided on the right side of the left cyclone burner 39. And the swirling combustion device 41 is provided on the left side of the right swirling combustor 39. I.e. the two first cyclones on the front waterwall 33 are located outside the second cyclone. The two first cyclones on the rear waterwall 35 are located outside the second cyclone. This alleviates high temperature erosion of the side water cooled wall 37 by the asymmetric perimeter wind of the first swirler.

Further, a multi-layer cyclone combustion system is arranged on the front water-cooled wall 33. And a multi-layer rotational flow combustion system is arranged on the rear water-cooled wall 35. For example, as shown in fig. 1, the front water wall 33 is provided with an upper layer cyclone combustion system, a middle layer cyclone combustion system and a lower layer cyclone combustion system. The upper layer swirling combustion system, the middle layer swirling combustion system and the lower layer swirling combustion system all comprise two combustion units and a plurality of swirling combustion devices 41 located between the two combustion units. Further, because the asymmetric circumferential wind flows in the third air duct 17 and is a direct current, the jet flow is ejected to the left side water-cooling wall 37 and the right side water-cooling wall 37 at a certain angle, the far range is strong in rigidity, a gas barrier can be formed between the left side water-cooling wall 37 and the right side water-cooling wall 37, the accumulation of reducing gas generated by combustion in the regions of the side water-cooling wall 37 and the right side water-cooling wall 37 is reduced, and the high-temperature corrosion phenomenon of the side water-cooling wall 37 of the hearth 49 is further relieved.

Further, an included angle is formed between the third air duct 17 of the cyclone burner 39 and the axial direction of the first air duct 11. Namely, the asymmetric perimeter wind mirror symmetry of the front water wall 33 and the rear water wall 35. This enables the air flows in the third air ducts 17 of the two cyclone burners 39 to converge without contacting the side water walls 37. That is, the asymmetric peripheral air in the second air duct 14 of the cyclone burner 39 blows to the side water-cooled wall 37 at a certain angle, so that the peripheral air with mirror symmetry at both sides is converged before reaching the side water-cooled wall 37, thereby not only effectively increasing the oxygen content in the area of the side water-cooled wall 37 and inhibiting the formation of reducing atmosphere, but also avoiding the erosive wear of the asymmetric peripheral air to the side water-cooled wall 37.

Further, the application method of the swirl combustion system of the embodiment of the application is as follows:

first, as shown in the figure, the tube of the asymmetric peripheral wind of the cyclone burner 39 near the left side water-cooled wall 37 and the right side water-cooled wall 37 of the furnace 49 is placed near the side water-cooled wall 37.

Then, the amount of pulverized coal transported by the first duct 11 in the cyclone burner 39 near the left side water-cooled wall 37 and the right side water-cooled wall 37 is appropriately reduced, and the reducing gas which can be generated by the cyclone burner 39 during the combustion process is reduced as much as possible.

The baffles 31 in the draft tube 29 are then adjusted to allow for proper distribution of the flow rate and volume of gas for the second 19 and third 17 plenums.

Finally, the gas branched to the third air duct 17 has strong rigidity after being acted by the third air duct 17, and the gas barrier is formed, so that the reducing cyclone gas generated by combustion can be effectively inhibited from being diffused to the left side water-cooled wall 37 and the right side water-cooled wall 37, and the adverse effect of the reducing gas generated by combustion of the cyclone burner 39 on the left side water-cooled wall 37 and the right side water-cooled wall 37 is reduced. Meanwhile, the asymmetric peripheral wind is positioned on the outer side of the flame, so that oxygen can be provided for combustion, and the combustion is more sufficient.

It should be noted that, in the description of the present application, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no precedence between the two is intended or should be construed to indicate or imply relative importance. In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego the subject matter and should not be construed as an admission that the applicant does not consider such subject matter to be part of the disclosed subject matter.

Claims (10)

1. A cyclone burner, characterized by comprising:

the first air pipe is provided with an inlet and an outlet and is used for inputting primary air into the hearth;

the second air pipe is sleeved outside the first air pipe; an annular space is formed between the second air pipe and the first air pipe;

a partition disposed within the annular space, the partition dividing the annular space into a third air duct distal from the first air duct and a second air duct located between the first air duct and the third air duct; the second air duct is used for inputting secondary air into the hearth; the cross-sectional area of the third air duct is gradually reduced from the inlet to the outlet to form a spray pipe.

2. The cyclone burner of claim 1, wherein an end of the third duct proximate the inlet is annular; and one end of the third air duct close to the outlet is semi-annular.

3. The cyclone burner of claim 1, wherein the divider is a tube that is sleeved outside the first duct; the second air pipe is sleeved outside the pipe body.

4. The cyclone burner of claim 1, wherein the third wind tunnel extends obliquely outward in a direction from the inlet to the outlet in axial cross-section.

5. The cyclone burner of claim 4, wherein the third air duct is angled from 6 to 12 degrees from the axial direction of the first air duct.

6. The cyclone burner of claim 1, wherein a draft tube is connected to an end of the second duct proximate the inlet; the drainage tube is communicated with the annular space; and the secondary air is used for inputting secondary air into the third air duct and the second air duct.

7. The cyclone burner of claim 6, wherein a baffle is disposed within the draft tube for regulating the amount of airflow within the third duct and the second duct.

8. A cyclone combustion system is used for a hearth, and the hearth comprises a front water-cooled wall, a rear water-cooled wall and at least one side water-cooled wall positioned between the front water-cooled wall and the rear water-cooled wall; characterized in that, the swirling combustion system comprises:

at least one combustion unit; corresponding to at least one of the side water-cooled walls; the combustion unit comprises two cyclone burners as claimed in any one of claims 1 to 7; the two cyclone burners are respectively arranged on the front water-cooled wall and the rear water-cooled wall; and the third air channels of the two cyclone burners are opened towards the corresponding side water-cooling walls, so that the airflow in the third air channels can flow towards the corresponding side water-cooling walls.

9. The cyclonic combustion system of claim 8, further comprising: at least one cyclonic combustion device; the front water-cooled wall and/or the rear water-cooled wall are/is arranged on the front water-cooled wall and/or the rear water-cooled wall; the cyclone combustion device comprises a first air pipe, a second air pipe and a cyclone combustion device, wherein the first air pipe is provided with an inlet and an outlet and is used for inputting primary air to the hearth; the cyclone combustion device is arranged on one side of the cyclone combustor, which is far away from the side water-cooling wall.

10. The cyclone combustion system of claim 8, wherein the third air duct of the cyclone burner is at an angle with the axial direction of the first air duct; so that the air flows in the third air ducts of the two cyclone burners can converge when the air flows do not contact the side water-cooled wall.

Images