CN114992640B

CN114992640B - Multichannel mixed fuel combustor for rotary kiln

Info

Publication number: CN114992640B
Application number: CN202210562815.3A
Authority: CN
Inventors: 韦维; 胡明月; 刘斌
Original assignee: Jiangxi Xiecheng Lithium Industry Co ltd
Current assignee: Jiangxi Xiecheng Lithium Industry Co ltd
Priority date: 2022-05-23
Filing date: 2022-05-23
Publication date: 2023-05-12
Anticipated expiration: 2042-05-23
Also published as: CN114992640A

Abstract

The invention relates to the technical field of combustors and discloses a multichannel mixed fuel combustor for a rotary kiln, which comprises an air channel, wherein the air channel is formed by mutually sleeving a plurality of pipelines, the pipelines are respectively a fuel channel, a rotational flow air flow channel and an axial flow air flow channel from inside to outside, a spray head is fixedly arranged at the position of an air outlet of the air channel, and a fixing piece is arranged in an inner cavity of the spray head. According to the invention, through the arrangement of the contact head and the air flow channel, when fuel enters the spray head from the air channel, the fuel can be contacted with the windward conical surface of the contact head, so that the fuel moves obliquely along the conical surface and is contacted with the rotational flow air flow, the mixing probability of fuel particles and the rotational flow air flow is increased, and the combustion effect of the fuel in the rotary kiln is indirectly improved.

Description

Multichannel mixed fuel combustor for rotary kiln

Technical Field

The invention relates to the technical field of combustors, in particular to a multichannel mixed fuel combustor for a rotary kiln.

Background

The burner is a device for spraying and mixing fuel and air in a certain mode for combustion, and is suitable for the fields of building materials, chemical industry, metallurgy and the like, and in the field of building materials, the burner is generally used in a cement rotary kiln for calcining cement clinker.

When the existing burner in the cement rotary kiln works, fuel (such as powdery material and gas material) is sprayed to the spray head through the fuel channel, meanwhile, rotational flow air flow and axial flow air flow are synchronously sprayed to the spray head, in the process, the fuel is positioned at the center of the spray head, the rotational flow air flow is positioned outside the fuel, the rotational flow air flow is externally arranged, so that the rotational flow air flow is mixed with fuel particles, in addition, the axial flow air flow is positioned outside the rotational flow air flow, the effect of stabilizing flow is further achieved, after the mixture enters the rotary kiln, combustion occurs, the cement is calcined into the mature material, but in the process, the fuel particles are not easily wrapped by the rotational flow air flow due to certain axial impact force when the fuel enters the spray head, so that the mixing degree of the fuel and the air is low, and the combustion effect of the fuel in the cement rotary kiln is affected.

Disclosure of Invention

Aiming at the defects of the prior burner in the use process, the invention provides a multichannel mixed fuel burner for a rotary kiln, which has the advantages of increasing the probability of mixing fuel and air and improving the fuel combustion effect, and solves the technical problems in the prior art.

The invention provides the following technical scheme: the utility model provides a multichannel mixed fuel combustor for rotary kiln, includes the wind channel, the wind channel cup joints the setting each other for multiple pipeline, the pipeline is fuel channel, whirl air current passageway and axial flow air current passageway from interior to exterior respectively, the fixed mounting in position of wind channel gas outlet has the shower nozzle, the mounting is installed to the inner chamber of shower nozzle, fixed mounting has the dead lever between the lateral surface of mounting and the inner wall of shower nozzle, the contact head is installed to the position that is close to the wind channel in the shower nozzle inner chamber, one side that is close to the wind channel on the contact head is the windward cone, windward cone is the toper inclined plane setting, the air current way that is inclination setting is seted up to the inside of contact head, the both ends port of air current way is seted up straight side and windward cone at the contact head respectively, the straight side of contact head is smooth transition setting with the lateral surface of mounting, contact head and fuel channel correspond the setting.

Preferably, the outer side surface of the fixing piece is a conical inclined surface, and the cross section area of the conical inclined surface is gradually increased from the air duct to the direction of the spray head.

Preferably, the air flow channels are arranged in a spiral equidistant manner, the spiral direction of the air flow channels is the same as the rotation direction of the rotational flow air flow, a sliding rod is fixedly arranged on the side surface of the contact head, which is far away from the air duct, a sliding cavity is formed in the fixing piece, and the sliding block end of the sliding rod is movably connected with the sliding cavity.

Preferably, the fixing piece is close to the side of the discharge hole of the spray head, a rotating fan is rotatably arranged on the side, a thread groove is formed in the center of the rotating fan, a screw is arranged in the thread groove in a threaded mode, the screw can reciprocate, and the conical inclined surface of the fixing piece and the rotating fan are correspondingly arranged with the rotational flow air flow channel.

Preferably, the one end fixed mounting that the screw rod is close to the mounting has the gag lever post, the inside position that is close to the fan of rotating of mounting has seted up spacing notch, spacing notch and gag lever post form movable joint, the other end of gag lever post can pass spacing notch to with the slider end contact of slide bar.

The invention has the following beneficial effects:

1. according to the invention, through the arrangement of the contact head and the air flow channel, when fuel enters the spray head from the air channel, the fuel can be contacted with the windward conical surface of the contact head, so that the fuel moves obliquely along the conical surface and is contacted with the rotational flow air flow, the mixing probability of fuel particles and the rotational flow air flow is increased, and the combustion effect of the fuel in the rotary kiln is indirectly improved.

2. According to the invention, through the arrangement of the contact head and the fixing piece, the fuel moving along the conical surface of the fixing piece can further contact the rotational flow air flow, so that the mixing effect of the fuel and the air is improved, and meanwhile, through the arrangement of the contact head and the conical surface of the fixing piece, when the air flow passes through the conical surface, the pressure of the air flow can be increased, and after the subsequent mixture is sprayed out of the spray head, the air flow can contact more combustion-supporting gas in the rotary kiln, so that the combustion effect of the fuel is improved.

3. According to the invention, through the arrangement of the rotating fan and the contact head, the rotational flow air flow passing through the fixing piece contacts with the rotating fan, so that the rotating fan drives the screw rod to reciprocate, the pushing head intermittently pushes the contact head to move in the opposite direction to the axial movement direction of the fuel, the axial impact force of the fuel is slowed down, and the fuel particles can be effectively wrapped by the rotational flow air flow, thereby increasing the mixing probability of the fuel and the air.

4. According to the invention, through the arrangement of the air flow channel and the contact head, as the air flow channel is in equidistant spiral arrangement, when fuel passes through the air flow channel, the contact head is driven to rotate, so that the fuel sprayed out of the air flow channel can perform rotational movement in the same rotational direction as the rotational direction of the rotational flow air flow, and further fuel particles and air are promoted to be mixed, and simultaneously, the fuel contacted with the air receiving conical surface of the contact head can be subjected to circumferential rotational force exerted by the contact head, so that partial axial impact force of the fuel is counteracted, and the fuel is further effectively wrapped and clamped by the rotational flow air flow.

Drawings

FIG. 1 is a schematic view of the internal structure of a spray head according to the present invention;

FIG. 2 is a schematic cross-sectional elevation view of the structure of the present invention;

FIG. 3 is an enlarged schematic view of a portion of the structure of FIG. 2A in accordance with the present invention;

FIG. 4 is a schematic view of the air duct of the present invention.

In the figure: 1. an air duct; 2. a spray head; 3. a fixing member; 4. a fixed rod; 5. a contact; 6. an air flow passage; 7. a slide bar; 8. a sliding cavity; 9. rotating the fan; 10. a screw; 11. a limit rod; 12. and a limit notch.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1 and 4, a multi-channel mixed fuel burner for a rotary kiln comprises an air channel 1, wherein the air channel 1 is formed by mutually sleeving a plurality of pipelines, the pipeline at the innermost position is a fuel channel, the pipeline at the middle position is a rotational flow air channel, the pipeline at the outermost position is an axial flow air channel, a spray head 2 is fixedly arranged at the position of an air outlet of the air channel 1, a fixing piece 3 is arranged at the central position of an inner cavity of the spray head 2, a fixing rod 4 is welded between the outer side surface of the fixing piece 3 and the inner wall of the spray head 2 and used for fixing the spray head 2 together, a contact head 5 is arranged at one side of the inner cavity of the spray head 2, which is positioned at the fixing piece 3 and faces the air channel 1, the side surface of the contact head 5 faces the air channel 1 is provided with an air receiving cone surface, the air receiving cone surface is provided with a conical inclined surface, an air flow channel 6 is obliquely arranged in the contact head 5, one end port of the air flow channel 6 is arranged on the air receiving cone surface, the other end port of the air flow channel 6 is arranged on the straight side surface of the contact head 5, the straight side surface of the contact head 5 and the outer side surface of the fixing piece 3 are in smooth transition, the contact head 5 is arranged corresponding to the fuel channel, when fuel and air enter the spray head 2 from the air channel 1, the fuel contacts with the windward conical surface of the contact head and the straight side surface, wherein the fuel contacted with the windward conical surface moves along the inclined surface to swirl air flow, so that the mixing probability of fuel particles and the swirl air flow is increased, the combustion effect of the fuel in the rotary kiln is indirectly improved, meanwhile, during the contact process of the fuel and the windward conical surface, part of the fuel can pass through the air flow channel 6 and then blow out from the straight side surface of the contact head 5, so that the fuel can impact with the fuel passing through the straight side surface, and the fuel is further promoted to approach the swirl air flow, thereby increasing the probability of mixing the two.

Referring to fig. 2, the outer side surface of the fixing member 3 is a tapered inclined surface, the cross-sectional area of the tapered inclined surface is gradually increased from the air duct 1 to the direction of the spray head 2, and the aperture of the inner cavity of the spray head 2 at the two positions is reduced through the arrangement of the fixing member 3 and the windward conical surface, so that when the air flow passes through the positions, the air pressure is increased, and the air flow is sprayed for a longer distance when finally spraying the air flow, so that the contact degree with the combustion-supporting gas in the rotary kiln is increased, and the combustion effect is improved.

The airflow channel 6 is in spiral equidistant arrangement, the spiral direction of the airflow channel 6 is the same as the rotation direction of the rotational flow, the sliding rod 7 is welded on the side surface of one side of the contact head 5 facing the fixing piece 3, the sliding cavity 8 is formed in the fixing piece 3, the sliding block end of the sliding rod 7 stretches into the sliding cavity 8 and is movably connected with the sliding cavity 8, when fuel passes through the airflow channel 6, the rotating force is applied to the contact head 5, the contact head 5 rotates, the rotation direction is the same as the rotation direction of the rotational flow, finally, the fuel sprayed out of the airflow channel 6 can perform the rotation motion same as the rotation direction of the rotational flow, the fuel particles and the air are promoted to be mixed, and meanwhile, the fuel contacted with the air receiving conical surface of the contact head 5 can be subjected to the circumferential rotation force applied by the contact head 5, so as to offset part of the axial impact force of the fuel, and the fuel can be effectively wrapped by the rotational flow, so that the mixing probability of the contact head and the rotational flow is increased.

The rotating fan 9 is rotatably arranged on the side surface of the fixing piece 3, which is opposite to one side of the air duct 1, the blades of the rotating fan 9 extend out of the conical inclined surface of the fixing piece 3, the center position of the rotating fan 9 transversely penetrates through and is provided with a thread groove, a screw 10 is arranged in the thread groove in a threaded manner, the screw 10 can reciprocate in the thread groove, the conical inclined surface of the fixing piece 3 and the rotating fan 9 are correspondingly arranged with a rotational flow channel, rotational flow and fuel moving along the conical inclined surface of the fixing piece 3 can contact with the blades of the rotating fan 9, and further the rotating fan 9 and the thread groove are driven to rotate, so that the screw 10 reciprocates in the thread groove, and a thrust is provided for realizing subsequent functions.

Referring to fig. 3, a limit rod 11 is welded at one end of a screw 10 close to a fixing member 3, a limit notch 12 is formed in the fixing member 3 at a position between a sliding cavity 8 and a rotating fan 9, the limit notch 12 is communicated with the sliding cavity 8, the limit notch 12 and the limit rod 11 form a movable clamping connection, the other end of the limit rod 11 can be in contact with the slide block end of a slide rod 7, when the screw 10 reciprocates, the limit rod 11 is driven to synchronously move, the limit rod 11 intermittently pushes the slide rod 7 to extend, the contact head 5 is further intermittently moved, the moving direction is opposite to the moving direction of fuel, through the action, the impact force between the contact head 5 and the fuel is intermittently increased, and then the axial impact force of the fuel is slowed down, so that fuel particles can be effectively wrapped by rotational flow, and the probability of mixing the fuel and air is increased.

The application method (working principle) of the invention is as follows:

during operation, fuel and air enter the spray head 2 from the air duct 1, fuel and air are mixed in the spray head 2, then the mixture enters the rotary kiln and is combusted in the rotary kiln, in the process, fuel and part of air are axially sprayed out of the fuel channel and the axial flow air channel, and the rest of air is rotationally sprayed out of the rotational flow air channel, when the fuel is axially sprayed out, the rest of air is firstly contacted with the windward conical surface of the contact head 5, so that part of fuel is close to rotational flow air along a conical inclined surface, and meanwhile, the other fuel is sprayed out of the straight side surface of the contact head 5 through the air flow channel 6, in addition, in the process of entering the air flow channel 6, the contact head 5 is pushed to rotate, so that the slide rod 7 rotates in the slide cavity 8, then the rotational flow air and the fuel are continuously conveyed, so that the rotational flow fan 9 contacts with the screw thread groove, and further the screw 10 drives the limit rod 11 to stretch out and shrink reciprocally, when the limit rod 11 stretches out, the rest of air is pushed 7 axially, so that the contact head 5 stretches synchronously and is opposite to the fuel, and finally the fuel is driven by the contact head 5 to rotate circularly through the slide rod 2, and the spray head 7 is in the process of the mixture.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a multichannel mixed fuel combustor for rotary kiln, includes wind channel (1), wind channel (1) cup joints the setting for multiple pipeline each other, the pipeline is fuel channel, whirl air current passageway and axial flow air current passageway from interior to exterior respectively, the position fixed mounting of wind channel (1) gas outlet has shower nozzle (2), its characterized in that: the air flow channel type air conditioner is characterized in that a fixing piece (3) is arranged in an inner cavity of the spray head (2), a fixing rod (4) is fixedly arranged between the outer side face of the fixing piece (3) and the inner wall of the spray head (2), a contact head (5) is arranged at a position, close to the air duct (1), in the inner cavity of the spray head (2), a side face, close to the air duct (1), of the contact head (5) is an air receiving conical surface, the air receiving conical surface is a conical inclined surface, an air flow channel (6) which is arranged at an inclined angle is formed in the contact head (5), ports at two ends of the air flow channel (6) are respectively formed in a straight side face of the contact head (5) and the air receiving conical surface, the straight side face of the contact head (5) and the outer side face of the fixing piece (3) are in smooth transition, and the contact head (5) and the fuel channel are correspondingly arranged;

the air flow channels (6) are arranged in a spiral equidistant manner, the spiral direction of the air flow channels (6) is the same as the rotation direction of the rotational flow air flow, a sliding rod (7) is fixedly arranged on the side surface of the contact head (5) away from the air duct (1), a sliding cavity (8) is formed in the fixing piece (3), and the sliding block end of the sliding rod (7) is movably connected with the sliding cavity (8);

a rotating fan (9) is rotatably arranged on the side surface of the fixing piece (3) close to the discharge hole of the spray head (2), a thread groove is formed in the center position of the rotating fan (9), a screw (10) is arranged in the thread groove in a threaded manner, the screw (10) can reciprocate, and a conical inclined surface of the fixing piece (3) and the rotating fan (9) are arranged corresponding to the rotational flow channel;

the screw rod (10) is close to one end fixed mounting of mounting (3) and has spacing notch (12) have been seted up to the position that is close to rotating fan (9) inside mounting (3), spacing notch (12) form movable joint with spacing pole (11), spacing notch (12) can be passed to the other end of spacing pole (11) to with the slider end contact of slide bar (7).

2. A multi-channel mixed fuel burner for a rotary kiln according to claim 1, wherein: the outer side surface of the fixing piece (3) is provided with a conical inclined surface, and the cross section area of the conical inclined surface is gradually increased from the air duct (1) to the direction of the spray head (2).