CN210345452U

CN210345452U - Secondary rotational flow burner

Info

Publication number: CN210345452U
Application number: CN201921077448.8U
Authority: CN
Inventors: 杜洪军; 匡新明; 卢立民; 陈家元; 杜洪杰
Original assignee: Qingdao Ningpu Thermal Equipment Co Ltd
Current assignee: Qingdao Ningpu Thermal Equipment Co Ltd
Priority date: 2019-07-10
Filing date: 2019-07-10
Publication date: 2020-04-17
Anticipated expiration: 2029-07-10

Abstract

The utility model discloses a secondary rotational flow burner, relating to the technical field of pulverized coal combustion, which is characterized in that the burner comprises a primary rotational flow chamber and a secondary rotational flow chamber arranged at one end of the primary rotational flow chamber, and the sections of the primary rotational flow chamber and the secondary rotational flow chamber are both circular; the primary cyclone chamber comprises an outer shell and an inner shell, a combustion chamber is formed in the inner shell, a cavity is formed between the outer shell and the inner shell, a first air inlet pipe communicated with the cavity is arranged on the outer shell, and the axial direction of the first air inlet pipe is superposed with the tangential direction of the inner shell; the second grade swirl chamber forms the whirl chamber in the room, and the whirl chamber is close to the one end and the combustion chamber intercommunication of combustion chamber, and the outer wall of second grade swirl chamber is provided with the second intake pipe with whirl chamber intercommunication, and the axis direction of second intake pipe and the tangential direction coincidence of second grade swirl chamber. This practicality has the effect that increases whirl intensity.

Description

Secondary rotational flow burner

Technical Field

The utility model relates to a pulverized coal combustion technology field, more specifically says, relates to a secondary whirl combustor.

Background

After advanced combustion technologies such as a coal powder concentration technology, a staged combustion technology and the like are available, the cyclone burner not only can organize a good aerodynamic field in the furnace, generate reasonable coal powder airflow concentration distribution in an ignition area, coal powder particle retention time and ignition distance, ensure stable combustion, but also can greatly reduce NOX gas emission. Meanwhile, the swirl burner has the advantages of relative independence, relative flexibility in arrangement and adjustment, small deviation of the temperature of the flue gas at the outlet of the hearth and the temperature of the steam and the like. However, the existing cyclone burner has the problem that the strength of the cyclone is not enough to achieve the expected effect.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide a secondary whirl combustor through carrying out the secondary whirl, increases the intensity of whirl.

In order to achieve the above purpose, the utility model provides a following technical scheme: a secondary rotational flow burner comprises a primary rotational flow chamber and a secondary rotational flow chamber arranged at one end of the primary rotational flow chamber, wherein the sections of the primary rotational flow chamber and the secondary rotational flow chamber are both circular; the primary cyclone chamber comprises an outer shell and an inner shell, a combustion chamber is formed in the inner shell, a cavity is formed between the outer shell and the inner shell, a first air inlet pipe communicated with the cavity is arranged on the outer shell, and the axial direction of the first air inlet pipe is superposed with the tangential direction of the inner shell; the second grade swirl chamber forms the whirl chamber in the room, and the whirl chamber is close to the one end and the combustion chamber intercommunication of combustion chamber, and the outer wall of second grade swirl chamber is provided with the second intake pipe with whirl chamber intercommunication, and the axis direction of second intake pipe and the tangential direction coincidence of second grade swirl chamber.

By adopting the technical scheme, the gas enters the cyclone cavity through the second gas inlet pipe and moves forward along the inner wall of the cyclone cavity to form a first-stage cyclone, and the first-stage cyclone is mixed with the pulverized coal in the combustion chamber and then continues to move forward in the direction far away from the second-stage cyclone chamber; the gas enters the cavity through the first gas inlet pipe and advances along the inner wall of the cavity to form a secondary rotational flow; the primary rotational flow and the secondary rotational flow are overlapped at the tail end of the combustion chamber to form a new rotational flow, and the strength of the new rotational flow is greater than that of the primary rotational flow or the secondary rotational flow, so that the enhancement of the rotational flow strength is realized; and the gas flowing in the cavity can cool the inner shell, so that the damage of high temperature to the inner shell is reduced.

The utility model discloses further set up to: the one end that the shell kept away from the second grade swirl chamber is fixed with the inclined plane, and the inclined plane is the annular, and the inclined plane is to the direction slope that is close to the inner shell.

By adopting the technical scheme, the inclined plane enables the rotational flow flowing out of the cavity to move along the direction of the inclined plane, so that the secondary rotational flow can move like the direction close to the combustion chamber, the diffusion of the rotational flow is reduced, and the superposition with the primary rotational flow is facilitated.

The utility model discloses further set up to: and a rotational flow device for increasing rotational flow stability of the primary rotational flow chamber is arranged in the cavity.

Through adopting above-mentioned technical scheme, the swirl device increases the stability of one-level whirl for the coincidence of one-level whirl that second grade whirl can be better.

The utility model discloses further set up to: the rotational flow device comprises a rotational flow plate, a connecting rod, a rotating ring and a driving assembly, wherein one end of the rotational flow plate is hinged with the inner shell, the connecting rod is hinged with the other end of the rotational flow plate, the rotating ring is hinged with the other end of the connecting rod, and the driving assembly drives the rotating ring to rotate.

By adopting the technical scheme, the gas passes through the cyclone plate and is restrained by the cyclone plate, so that the turbulent flow of the gas can be reduced, and the stability of the gas passing through the cyclone plate is improved; the driving piece drives the go-between and rotates the back, and the position of connecting rod changes, and the go-between that the position changes can drive the position of connecting rod and change, and then drives the position of whirl board and change, and the position of whirl board changes the back, and the angle of whirl also changes thereupon to the convenient angle to the whirl changes.

The utility model discloses further set up to: the drive assembly comprises a rack fixed on one side of the rotating ring away from the cyclone plate, a gear meshed with the rack and a motor driving the gear to rotate.

Through adopting above-mentioned technical scheme, the motor rotates and drives the gear rotation, and the gear rotation drives the position of the rack with gear engagement and changes to drive the rotating ring and rotate, conveniently drive the rotating ring through the motor and rotate, thereby conveniently change the angle of whirl board.

The utility model discloses further set up to: one end of the secondary cyclone chamber close to the combustion chamber is a conical block, and the sectional area of one end of the conical block close to the combustion chamber is small.

Through adopting above-mentioned technical scheme, the toper piece makes the gas through the toper piece draw close to the center, reduces gaseous diffusion, and the combustion effect of the interior gas of increase burning and buggy is mixed to the increase of burning.

The utility model discloses further set up to: an auxiliary pipe penetrates through the center of the secondary cyclone chamber, and one end of the auxiliary pipe penetrating through the center of the secondary cyclone chamber extends into the combustion chamber.

Through adopting above-mentioned technical scheme, supplementary shell lets in supplementary combustion gas, increases the buggy branch combustion effect in the combustion chamber.

In conclusion, the beneficial technical effects of the invention are as follows:

1. the gas enters the cyclone cavity through the second gas inlet pipe and advances along the inner wall of the cyclone cavity to form a first-stage cyclone, and the first-stage cyclone is mixed with the pulverized coal in the combustion chamber and then continues to advance in the direction far away from the second-stage cyclone chamber; the gas enters the cavity through the first gas inlet pipe and advances along the inner wall of the cavity to form a secondary rotational flow; the primary rotational flow and the secondary rotational flow are overlapped at the tail end of the combustion chamber to form a new rotational flow, and the strength of the new rotational flow is greater than that of the primary rotational flow or the secondary rotational flow, so that the enhancement of the rotational flow strength is realized; the gas flowing in the cavity can cool the inner shell, so that the damage of the inner shell caused by high temperature is reduced;

2. the inclined surface enables the rotational flow flowing out of the cavity to move along the direction of the inclined surface, so that the secondary rotational flow can move like a direction close to the combustion chamber, the diffusion of the rotational flow is reduced, and the superposition with the primary rotational flow is facilitated;

3. the cyclone device increases the stability of the first-stage cyclone, so that the second-stage cyclone can be better superposed with the first-stage cyclone.

Drawings

FIG. 1 is a schematic view of the overall structure of the embodiment;

FIG. 2 is a sectional view of the embodiment;

fig. 3 is a schematic view showing a swirling device.

In the figure: 1. a primary swirl chamber; 11. a combustion chamber; 12. a first intake pipe; 13. a cavity; 14. a housing; 141. a bevel; 15. an inner shell; 2. a swirling device; 21. a rotating ring; 22. a rack; 23. a gear; 231. a motor; 24. a connecting rod; 25. a swirl plate; 3. a secondary swirl chamber; 31. a second intake pipe; 32. a vortex chamber; 33. a conical block; 4. an auxiliary tube; 41. a branch pipe; 5. a pulverized coal pipe.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example (b): the utility model provides a secondary whirl combustor, refers to fig. 1 and fig. 2, includes one-level swirl chamber 1, sets up at the inside whirl device 2 of one-level swirl chamber 1, connects the second grade swirl chamber 3 in one-level swirl chamber 1 one end, passes the auxiliary tube 4 of second grade swirl chamber 3 and passes the buggy pipe 5 of auxiliary tube 4.

The cross section of the first-stage cyclone chamber 1 is circular and comprises an outer shell 14 and an inner shell 15, the inner part of the inner shell 15 is provided with a combustion chamber 11 for burning the second-stage cyclone chamber 3, a cavity 13 is formed between the outer shell 14 and the inner shell 15, and the cyclone device 2 is placed in the cavity 13; the intercommunication has first intake pipe 12 on the shell 14, and first intake pipe 12 and cavity 13 intercommunication, and the axial direction of first intake pipe 12 and the tangential direction coincidence of one-level swirl chamber 1, and gaseous back in entering into cavity 13 from first intake pipe 12 can advance along the outer wall spiral of inner shell 15, forms the whirl. An inclined plane 141 is fixed at one end of the outer shell 14 far away from the secondary cyclone chamber 3, the inclined plane 141 is annular, and the inclined plane 141 inclines towards the direction close to the inner shell 15.

The vertical cross section of second grade swirl chamber 3 is the ring shape, forms whirl chamber 32 in the second grade swirl chamber 3,

whirl chamber

32 and 11 intercommunications of combustion chamber. The outer wall of the secondary cyclone chamber 3 is communicated with a second air inlet pipe 31, the second air inlet pipe 31 is communicated with the cyclone cavity 32, and the axial direction of the second air inlet pipe 31 is superposed with the tangential direction of the secondary cyclone chamber 3; after entering the swirl chamber 32 from the second inlet pipe 31, the gas will spirally advance along the inner wall of the secondary swirl chamber 3 to form a swirl. One end of the secondary cyclone chamber 3 close to the combustion chamber 11 is a conical block 33, and the cross-sectional area of one end of the conical block 33 close to the combustion chamber 11 is small.

The auxiliary pipe 4 passes through the center of the secondary cyclone chamber 3, and one end of the auxiliary pipe passing through the center of the secondary cyclone chamber 3 extends into the combustion chamber 11; the pulverized coal pipe 5 passes through the center of the auxiliary pipe 4, and protrudes into the combustion chamber 11 through one end of the auxiliary pipe 4. The side wall of the auxiliary pipe 4 is communicated with a branch pipe 41, and the branch pipe 41 is introduced with auxiliary gas for assisting the combustion of the pulverized coal.

The pulverized coal enters the combustion chamber 11 from the pulverized coal pipe 5, is mixed with the auxiliary gas and the air entering the combustion chamber 11, and is ignited to form a primary rotational flow. After leaving the combustion chamber 11, the primary swirls are mixed with the swirls formed in the cavity 13 to form a secondary swirl. The strength of the rotational flow is increased by two rotational flows.

Referring to fig. 2 and 3, the swirling device 2 includes a rotating ring 21 abutting against the outer casing 14, a rack 22 fixed to a side of the rotating ring 21 away from the inner casing 15, a gear 23 engaged with the rack 22, a connecting rod 24 hinged to a side of the rotating ring 21 close to the inner casing 15, and a swirling plate 25 hinged to the connecting rod 24. A motor 231 for driving the gear 23 to rotate is fixed on the housing 14.

The two sides of the rotational flow plate 25 are respectively hinged with the connecting rod 24 and the inner shell 15; both ends of the connecting rod 24 are respectively hinged with the connecting rod 24 and the rotating ring 21. The rotating ring 21 rotates, and the position of the connecting point of the connecting rod 24 and the rotating ring 21 can be changed, so that the connecting rod 24 is driven to be positioned, and the position of the cyclone plate 25 is changed. The gas passes through the whirl plate 25, and through the restraint of whirl plate 25, can reduce gaseous sinuous flow to increase the gaseous stability through whirl plate 25. And the position of whirl board 25 changes the back, can change the angle of the whirl of production for the whirl through cavity 13 can be better mix with the first order whirl, form stronger whirl.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A secondary cyclone burner is characterized in that: the cyclone comprises a primary cyclone chamber (1) and a secondary cyclone chamber (3) arranged at one end of the primary cyclone chamber (1), wherein the sections of the primary cyclone chamber (1) and the secondary cyclone chamber (3) are both circular; the primary cyclone chamber (1) comprises an outer shell (14) and an inner shell (15), a combustion chamber (11) is formed in the inner shell (15), a cavity (13) is formed between the outer shell (14) and the inner shell (15), a first air inlet pipe (12) communicated with the cavity (13) is arranged on the outer shell (14), and the axial direction of the first air inlet pipe (12) is overlapped with the tangential direction of the inner shell (15); form whirl chamber (32) in second grade whirl chamber (3), whirl chamber (32) are close to one end and the combustion chamber (11) intercommunication of combustion chamber (11), and the outer wall of second grade whirl chamber (3) is provided with second intake pipe (31) with whirl chamber (32) intercommunication, and the axial direction of second intake pipe (31) and the tangential direction coincidence of second grade whirl chamber (3).

2. A secondary swirl cyclone burner according to claim 1 in which: an inclined plane (141) is fixed to one end, far away from the secondary cyclone chamber (3), of the outer shell (14), the inclined plane (141) is annular, and the inclined plane (141) inclines towards the direction close to the inner shell (15).

3. A secondary swirl cyclone burner according to claim 1 in which: and a rotational flow device (2) for increasing rotational flow stability of the primary rotational flow chamber (1) is arranged in the cavity (13).

4. A secondary swirl cyclone burner according to claim 3 in which: the cyclone device (2) comprises a cyclone plate (25) with one end hinged with the inner shell (15), a connecting rod (24) hinged with the other end of the cyclone plate (25), a rotating ring (21) hinged with the other end of the connecting rod (24) and a driving assembly driving the rotating ring (21) to rotate.

5. A secondary swirl cyclone burner according to claim 4 in which: the driving assembly comprises a rack (22) fixed on one side of the rotating ring (21) far away from the cyclone plate (25), a gear (23) meshed with the rack (22) and a motor (231) driving the gear (23) to rotate.

6. A secondary swirl cyclone burner according to claim 1 in which: one end of the secondary cyclone chamber (3) close to the combustion chamber (11) is a conical block (33), and the sectional area of one end of the conical block (33) close to the combustion chamber (11) is small.

7. A secondary swirl cyclone burner according to claim 1 in which: an auxiliary pipe (4) penetrates through the center of the secondary cyclone chamber (3), and one end, penetrating through the center of the secondary cyclone chamber (3), of the auxiliary pipe (4) extends into the combustion chamber (11).