CN111878803A - Cyclone burner, boiler and combustion method - Google Patents

Cyclone burner, boiler and combustion method Download PDF

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Publication number
CN111878803A
CN111878803A CN202010897864.3A CN202010897864A CN111878803A CN 111878803 A CN111878803 A CN 111878803A CN 202010897864 A CN202010897864 A CN 202010897864A CN 111878803 A CN111878803 A CN 111878803A
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China
Prior art keywords
secondary air
pipe
air
inner secondary
primary air
Prior art date
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Pending
Application number
CN202010897864.3A
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Chinese (zh)
Inventor
武学谦
崔星源
相明辉
牛涛
刘鹏飞
张超群
方永旭
辛道义
杜俊硕
范艳荣
张冲
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Yantai Longyuan Power Technology Co Ltd
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Yantai Longyuan Power Technology Co Ltd
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Application filed by Yantai Longyuan Power Technology Co Ltd filed Critical Yantai Longyuan Power Technology Co Ltd
Priority to CN202010897864.3A priority Critical patent/CN111878803A/en
Publication of CN111878803A publication Critical patent/CN111878803A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
    • F23C5/08—Disposition of burners
    • F23C5/32—Disposition of burners to obtain rotating flames, i.e. flames moving helically or spirally
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L1/00—Passages or apertures for delivering primary air for combustion 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N3/00—Regulating air supply or draught
    • F23N3/007—Regulating air supply or draught using mechanical means

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

The invention discloses a cyclone burner, a boiler and a combustion method, wherein the cyclone burner comprises: the primary air pipe is used for outputting primary air; the inner secondary air pipe is sleeved outside the primary air pipe and used for outputting inner secondary air; the separation pipe is sleeved between the inner secondary air pipe and the primary air pipe and is used for separating the passing inner secondary air into inner secondary air flowing through a flow passage between the separation pipe and the primary air pipe and outer secondary air flowing through a flow passage between the separation pipe and the inner secondary air pipe; the adjusting device comprises a driving part and a plurality of blades which are arranged between the separation pipe and the primary air pipe and have adjustable inclination angles, the blades are distributed along the circumferential direction of the primary air pipe, and the driving part is used for driving the blades to rotate around respective rotating axes so as to adjust the inclination angles.

Description

Cyclone burner, boiler and combustion method
Technical Field
The invention relates to the field of pulverized coal combustion, in particular to a spiral-flow type combustor, a boiler and a combustion method.
Background
Most of the power generation share in the electric power industry in China is thermal power generation, coal powder is usually used for combustion in a hearth of a boiler in the thermal power generation, and a spiral-flow type burner is usually used during the combustion of the boiler. The cyclone burner is composed of air pipes with nozzles, and mainly comprises a primary air pipe for conveying primary air (namely air flow carrying pulverized coal, also called pulverized coal air flow), a secondary air pipe for conveying secondary air, an ignition device for igniting the primary air and the like. The primary air, the secondary air, and the like rotate when passing through a swirler in the burner, and form a rotating jet when being ejected from a nozzle. The rotary jet flow can form a high-temperature flue gas backflow area, and the size of the high-temperature flue gas backflow area directly influences the ignition and combustion of the pulverized coal.
In order to pursue economic effects, the conventional thermal power plants use various types of coal with different qualities, such as high-volatile coal and low-volatile coal. The swirl burner in the prior art has limited adjustment degree aiming at the combustion process of different kinds of coal, and can not adjust a proper combustion process when different kinds of coal are combusted.
Disclosure of Invention
The invention aims to provide a cyclone burner which can adapt to the combustion of primary air of various coals and adjust a proper combustion process. The invention also provides a boiler using the cyclone burner and a combustion method.
In a first aspect of the present invention, there is disclosed a swirling burner comprising:
the primary air pipe is used for outputting primary air;
the inner secondary air pipe is sleeved outside the primary air pipe and used for outputting inner secondary air;
the separation pipe is sleeved between the inner secondary air pipe and the primary air pipe and is used for separating the passing inner secondary air into inner secondary air flowing through a flow passage between the separation pipe and the primary air pipe and outer secondary air flowing through a flow passage between the separation pipe and the inner secondary air pipe;
the adjusting device comprises a driving part and a plurality of blades which are arranged between the separation pipe and the primary air pipe and have adjustable inclination angles, the blades are distributed along the circumferential direction of the primary air pipe, and the driving part is used for driving the blades to rotate around respective rotating axes so as to adjust the inclination angles.
In some embodiments, the adjusting device further includes a plurality of rotating shafts fixedly connected to the plurality of blades in a one-to-one correspondence, the driving portion includes an annular body sleeved outside the primary air duct and a plurality of link mechanisms corresponding to the plurality of blades in a one-to-one correspondence, one end of each link mechanism is connected to the annular body, the other end of each link mechanism is fixedly connected to the rotating shaft connected to the corresponding blade, and the driving portion is configured to drive the plurality of link mechanisms to rotate the rotating shafts connected to the corresponding blades through movement of the annular body, so as to adjust the inclination angles of the corresponding blades.
In some embodiments, the link mechanism includes a first rod and a second rod, a first end of the first rod is hinged to the annular body, a second end of the first rod is hinged to a first end of the second rod, and a second end of the second rod is fixedly connected to a rotating shaft connected to a corresponding blade of the link mechanism.
In some embodiments, the rotating shaft connected with the plurality of blades is hinged to the separating tube, and the annular body is sleeved outside the separating tube.
In some embodiments, the plurality of blades are located at the same position in the axial direction of the primary air pipe, the working surfaces of the blades for flowing the secondary air in the inner secondary air are flat surfaces, the plurality of blades have a flush state, when the driving portion drives the plurality of blades to rotate to the flush state, the plurality of blades are connected with each other to form an annular plate, and the working surfaces of the plurality of blades are flush with each other to form an annular surface.
In some embodiments, further comprising:
and the outer secondary air pipe is sleeved outside the inner secondary air pipe and used for outputting outer secondary air, and the separation pipe is configured to lead out the outer secondary air of the inner secondary air to be mixed with the outer secondary air.
In some embodiments, the separation pipe comprises a straight pipe section sleeved outside the primary air pipe and a divergent pipe section located downstream of the straight pipe section along the flow direction of the secondary air outside the primary air pipe.
In some embodiments, the cyclone burner comprises a separation device disposed in the primary air duct, the separation device being configured to separate the primary air into a radially outer primary air and a radially inner primary air.
The invention discloses a boiler in a second aspect, which comprises the cyclone burner.
The invention discloses a combustion method using the cyclone burner in a third aspect, which comprises the following steps:
introducing primary air into the primary air pipe;
introducing inner secondary air into the inner secondary air pipe, and dividing the inner secondary air into inner secondary air inner side air and inner secondary air outer side air by using the separation pipe;
when the pulverized coal of the primary air is changed into pulverized coal with low volatile components, the driving part is utilized to drive the blades to adjust the inclination angle so as to increase the rotational flow strength of the inner secondary air and reduce the flow proportion of the inner secondary air to the inner secondary air;
when the pulverized coal of the primary air is changed into pulverized coal with high volatile, the driving part is utilized to drive the blades to adjust the inclination angle so as to reduce the rotational flow intensity of the inner secondary air and increase the flow proportion of the inner secondary air to the inner secondary air.
In some embodiments, the cyclone burner further comprises an outer secondary air duct for outputting outer secondary air, the outer secondary air duct is sleeved outside the inner secondary air duct, the separation duct is configured to guide the outer secondary air of the inner secondary air to be mixed with the outer secondary air, and the combustion method further comprises introducing the outer secondary air into the outer secondary air duct.
Based on the cyclone burner provided by the invention, the separating pipe and the adjusting device are arranged in the inner secondary air pipe, so that when primary air of pulverized coal with lower volatile components is combusted, the plurality of blades can be driven by the driving part to rotate around respective rotating axes, the cyclone intensity of the inner side air of the inner secondary air is adjusted and increased, and the flow proportion of the inner side air of the inner secondary air is reduced, so that the size of a high-temperature flue gas backflow area between the inner side air of the inner secondary air and the primary air is increased, the ignition point position of the primary air is advanced, the combustion of pulverized coal airflow is enhanced, the volatile components of the pulverized coal airflow are separated out earlier, the mixing point of the secondary air and the primary air is delayed, and the generation amount of NOx (nitrogen oxide) is reduced. When the primary air of coal with higher volatile components is combusted, the plurality of blades can be driven by the driving part to rotate around respective rotating axes, the rotational flow strength of the inner secondary air and the flow proportion of the inner secondary air are adjusted and reduced, the position of a high-temperature flue gas backflow area is far away from a burner nozzle, the ignition point of the primary air is delayed, the initial ignition strength is reduced, the problems of burning loss, slag formation and the like of the burner nozzle are solved, the air volume of the inner secondary air and the air volume of the primary air are increased, the mixing point of the secondary air and the primary air is advanced, and the combustion efficiency of the coal with high volatile components is improved.
The boiler and the combustion method using the cyclone burner also have corresponding beneficial effects.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic view of a cyclone burner according to an embodiment of the present invention;
FIG. 2 is a schematic view of the tuning device of the cyclonic burner of FIG. 1 in one state;
fig. 3 is a schematic view of the adjustment device shown in fig. 2 in another state.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1 to 3, the cyclone burner disclosed in this embodiment includes a primary air duct 1, an inner secondary air duct 21, a separation duct 3, and an adjusting device 4.
The primary air pipe 1 is used for outputting primary air, coal is ground into coal powder through a coal mill when the boiler burns, then primary air is formed through mixing with air and sent into the primary air pipe 1, and the primary air pipe 1 outputs the primary air into a hearth of the boiler through a nozzle to burn.
The inner secondary air pipe 21 is sleeved outside the primary air pipe 1 and used for outputting inner secondary air; the inner secondary air pipe 21 is used for outputting inner secondary air into the hearth. In the embodiment shown in fig. 1, the secondary air ducts comprise an inner secondary air duct 21 and an outer secondary air duct 22, and the secondary air comprises inner secondary air outputted from the inner secondary air duct 21 and outer secondary air outputted from the outer secondary air duct 22. In some embodiments not shown in the drawings, when the secondary air duct only includes the inner secondary air duct 21, the inner secondary air outputted by the inner secondary air duct 21 is the secondary air.
The separating pipe 3 is sleeved between the inner secondary air pipe 21 and the primary air pipe 1, and the separating pipe 3 is used for separating the passing inner secondary air into inner secondary air passing through a flow passage between the separating pipe 3 and the primary air pipe 1 and inner secondary air passing through a flow passage between the separating pipe 3 and the inner secondary air pipe 21.
As shown in fig. 1 to 3, the adjusting device 4 includes a driving portion and a plurality of blades 41 with adjustable inclination angles, the plurality of blades 41 are disposed between the separating tube 3 and the primary air duct 1, the plurality of blades 41 are distributed along the circumferential direction of the primary air duct 1, and the driving portion is configured to drive the plurality of blades 41 to rotate around respective rotation axes to adjust the inclination angles.
Because the cyclone burner of this embodiment sets up the spacer tube 3 in the interior overgrate air pipe 21 and divide into interior overgrate air inboard wind and interior overgrate air outside wind to the flow resistance of interior overgrate air inboard wind between spacer tube 3 and primary air pipe 1 is big, and then the interior overgrate air inboard wind accounts for the flow proportion of interior overgrate air little, and the flow resistance of interior overgrate air inboard wind between spacer tube 3 and primary air pipe 1 is little, and then the interior overgrate air inboard wind accounts for the flow proportion of interior overgrate air big more.
The driving section can adjust the inclination angle of the plurality of blades 41, for example, as shown in fig. 2, when the inclination degree of the plurality of blades 41 with respect to the cross section of the separation pipe 3 is smaller, the flow area between the plurality of blades 41 is reduced, the flow resistance of the inner secondary wind inside the inner secondary wind is increased, the swirl strength of the inner secondary wind inside the inner secondary wind can be increased, and the flow rate ratio of the inner secondary wind inside the inner secondary wind to the inner secondary wind can be reduced at the same time. The driving part can also adjust the inclination angle of the plurality of blades 41, for example, as shown in fig. 3, when the inclination degree of the plurality of blades 41 relative to the cross section of the separation pipe 3 is larger, the flow area among the plurality of blades 41 is increased, the flow resistance of the inner secondary wind inside the inner secondary wind is reduced, the swirl strength of the inner secondary wind inside the inner secondary wind is reduced, and the flow rate proportion of the inner secondary wind inside the inner secondary wind to the inner secondary wind is increased at the same time. That is, the adjustment of the inclination angle of the plurality of blades 41 by the adjustment device 4 simultaneously has two effects of adjusting the intensity of the swirling flow and changing the flow rate ratio of the inner secondary air.
The cyclone burner of this embodiment through set up branch pipe 3 and adjusting device 4 in interior overgrate air pipe 21, is divided into interior overgrate air inboard wind and interior overgrate air outside wind with interior overgrate air, and adjusting device can adjust the flow ratio that interior overgrate air inboard wind's swirl intensity and interior overgrate air inboard wind account for interior overgrate air simultaneously. When pulverized coal airflow of low volatile coal is combusted, the plurality of blades are driven to rotate around respective rotating axes by the driving part, the rotational flow strength of inner secondary air inside side air is increased, the flow ratio of the inner secondary air inside side air is reduced, the increase of the rotational flow strength of the inner secondary air inside side air can increase the size of a high-temperature flue gas backflow area between the inner secondary air inside side air and primary air, the reduction of the flow of the inner secondary air inside side air can also increase the length of the high-temperature flue gas backflow area between the inner secondary air inside side air and the primary air, so that the adjusting device can obviously adjust the size of the high-temperature flue gas backflow area, for the combustion of the low volatile coal, the high-temperature flue gas backflow area is closer to a burner nozzle, the ignition point of the primary air can be advanced, the increase of the rotational flow strength can increase the turbulence degree of the burner nozzle, and the combustion of the pulverized coal airflow is strengthened, the increase of the high-temperature flue gas reflux area can separate out the volatile components of the pulverized coal airflow earlier, delay the mixing point of secondary air and primary air and reduce the generation amount of NOx (nitrogen oxide).
When the high volatile coal or the low ash fusion coal is combusted, the plurality of blades can be driven by the driving part to rotate around respective rotation axes, so that the swirl intensity of the inner secondary air and the flow proportion of the inner secondary air are reduced, the position of a high-temperature flue gas backflow area is far away from a burner nozzle, the ignition point of primary air is delayed, the initial ignition intensity is reduced, the problems of burning loss, slag formation and the like of the burner nozzle are reduced, the air volume of the inner secondary air and the air volume of the primary air are increased, the mixing point of the secondary air and the primary air can be advanced, and the combustion efficiency of the high volatile coal is improved.
The spiral-flow type combustor of this embodiment, adjusting device regulatory function is strong, adjusts effectually, and accommodation is wide, can adapt to the burning of multiple coal.
In some embodiments, as shown in fig. 2 and 3, the adjusting device includes a plurality of rotating shafts 412 fixedly connected to the plurality of blades 41 in a one-to-one correspondence manner, the driving portion includes an annular body 42 sleeved outside the primary air duct 1 and a plurality of link mechanisms 43 corresponding to the plurality of blades 41 in a one-to-one correspondence manner, one end of each link mechanism 43 is connected to the annular body 42, the other end of each link mechanism 43 is fixedly connected to the rotating shaft 412 connected to the corresponding blade 41, and the driving portion is configured to drive the plurality of link mechanisms 43 to rotate the rotating shafts 412 of the corresponding blades 41 through the movement of the annular body 42 so as to adjust the inclination angles of the corresponding blades 41.
In the present embodiment, the inclination angle of each blade 41 can be adjusted simultaneously by moving the driving ring 42 in the axial direction of the cyclone burner, that is, by rotating the rotating shaft 412 of each blade 41 through the link mechanism. The adjustment mode is simple, and the arrangement of the annular body 42 is also beneficial to reducing the interference on the flow of the inner secondary air in the inner secondary air pipe 21.
The rotating shaft 412 of each blade 41 can be hinged to the separating tube 3, the axial position of the rotating shaft 412 relative to the separating tube 3 is fixed, at this time, the annular body 42 can be sleeved in the separating tube 3 or sleeved outside the separating tube 3, the inclination angle of each blade 41 can be changed by the axial movement of the annular body 42 relative to the separating tube 3, as shown in fig. 2, the state is when the inclination degree of each blade 41 relative to the separating tube 3 is small, and fig. 3 is the state after the movement of the annular body 42 increases the inclination degree of each blade 41 relative to the separating tube 3. In the embodiment shown in fig. 1, the annular body 42 is sleeved outside the separating tube 3, the rotating shaft 412 extends out of the separating tube 3, and the link mechanism is fixedly connected to the top end of the rotating shaft 412, so that the influence of the annular body and the link mechanism on the flow path of the secondary air inside the secondary air can be reduced. In some embodiments, not shown, the shaft 412 may also be hinged to the primary air duct 1.
In some embodiments, the link mechanism 43 includes a first rod 431 and a second rod 432, a first end of the first rod 431 is hinged to the ring body 42, a second end of the first rod 431 is hinged to a first end of the second rod 432, and a second end of the second rod 432 is fixedly connected to the rotating shaft 412 of the vane 41 corresponding to the link mechanism 43.
In some embodiments, as shown in fig. 1 to 3, the plurality of blades 41 are located at the same position in the axial direction of the primary air duct 1, as shown in fig. 2 and 3, the working surfaces of the blades 41 for flowing the inside wind of the inner secondary air are flat surfaces, the plurality of blades 41 have a flush state, when the driving portion drives the plurality of blades 41 to rotate to the flush state, the plurality of blades 41 are connected to each other to form an annular plate, and the working surfaces of the plurality of blades 41 are flush with each other to form an annular surface. The working surface of the blade 41 refers to the surface of the blade 41 which is impacted by the inner secondary wind and when the inner secondary wind passes through the adjusting device from the ring body 42 to the direction of the blade 41 in the embodiment shown in fig. 2, the working surface of the blade 41, i.e. the windward surface 413 of the blade 41, i.e. the suction surface of the blade 41, and the other surface of the blade 41, i.e. the leeward surface 411, i.e. the pressure surface 411 are the same. Because the working surface is a plane, the vane 41 of the present embodiment is easier to process and manufacture, and because when the vanes 41 are connected to each other to form the annular plate, the working surfaces of the vanes 41 are flush and connected to each other to form the annular surface, the vanes 41 of the present embodiment can be integrally processed and manufactured by a single plate, and then separated to form the vanes 41, which is easier to process and manufacture. In addition, when the working surface of each blade 41 is parallel to the axial direction, the working surface can maximally reduce interference with the axial flow of the inner secondary wind inner side wind.
In some embodiments, as shown in FIG. 1, the cyclonic burner further includes an outer secondary air duct 22.
The outer secondary air pipe 22 is sleeved outside the inner secondary air pipe 21 and used for outputting outer secondary air, and the separation pipe 3 is configured to lead out the outer secondary air of the inner secondary air to be mixed with the outer secondary air. An outer secondary air duct 22 is provided to divide the secondary air into inner and outer secondary air, the outer secondary air being used for over-burning in the later stage of the primary air. The outer side air of the inner secondary air is led out to be mixed with the outer secondary air, when the adjusting device enables the rotational flow intensity of the inner side air of the inner secondary air to be increased and the flow proportion of the inner side air of the inner secondary air to be reduced, the outer secondary air can be increased due to the fact that the inner side air of the inner secondary air is mixed, when the spiral-flow type burner is applied to hearth combustion, the outlet air flow of the spiral-flow type burner can also go deep into the hearth, therefore higher-temperature flue gas can be sucked in an entrainment mode, and the burnout of the primary air in the later period is promoted.
In some embodiments, the cyclone burner comprises a separation device 7 disposed in the primary air duct for separating the primary air into a radially outer primary air and a radially inner primary air. As shown in fig. 1, the concentration and dilution separating device is a conical body located in the middle of the primary air pipe 1, the diameter of the conical body is increased and then reduced along the flowing direction of primary air, when the primary air impacts the surface of the conical body, pulverized coal begins to gather towards the pipe wall side of the primary air pipe 1, when the primary air flows to the diameter reduction section of the conical body, due to inertia, the dilute primary air flows towards the middle of the primary air pipe 1 along the surface of the conical body, the concentrated primary air can be kept in the radial outer side of the primary air pipe 1, and therefore concentration and dilution separation are performed on the primary air.
In some embodiments, the cyclone burner further comprises a first cyclone 211 and a second cyclone 221, the inner secondary air fed into the inner secondary air duct 21 firstly passes through the cyclone of the first cyclone 211 and then enters the inner secondary air duct, and the outer secondary air fed into the outer secondary air duct 22 firstly passes through the cyclone of the second cyclone 221 and then enters the outer secondary air duct 22.
In some embodiments, the cyclone burner further comprises a plurality of combustion stabilizing teeth 5 located at the outlet of the primary air duct 1, and the plurality of combustion stabilizing teeth 5 are uniformly arranged along the circumferential direction of the primary air duct 1.
In some embodiments, the separation pipe 3 comprises a straight pipe section 31 sleeved outside the primary air pipe 1 and a divergent pipe section 32 located downstream of the straight pipe section along the flow direction of the side wind outside the inner secondary wind. The length L of the straight pipe section 1 is 100-1000 mm. The included angle of the divergent pipe section relative to the axis of the separation pipe 3 is 10-55 degrees.
In some embodiments, the cyclone burner further comprises an ignition device for initial ignition of the primary air, the ignition device comprising a central air duct 61 located in the center and an oil lance 62 located within the central air duct 61, the oil lance 62 being fed with oil, the central air duct 61 being fed with central air to provide oxygen for ignition of the oil, the oil lance 62 igniting the oil for initial ignition of the primary air.
Also disclosed in some embodiments is a boiler comprising the cyclone burner described above.
In some embodiments, a combustion method using the cyclone burner is further disclosed, which includes:
introducing primary air into the primary air pipe 1;
the inner secondary air is introduced into the inner secondary air pipe 21 and is divided into inner secondary air inner side air and inner secondary air outer side air by the separating pipe 3;
when the pulverized coal of the primary air is changed into pulverized coal with lower volatile components, the driving part is utilized to drive the plurality of blades 41 to adjust the inclination angle so as to increase the rotational flow strength of the inner side wind of the inner secondary air and reduce the flow proportion of the inner side wind of the inner secondary air;
when the pulverized coal in the primary air is changed into pulverized coal with higher volatile components, the driving part is used for driving the plurality of blades 41 to adjust the inclination angle so as to reduce the rotational flow strength of the inner side wind of the inner secondary air and increase the flow proportion of the inner side wind of the inner secondary air.
In some embodiments, the cyclone burner further comprises an outer secondary air duct 22 for outputting outer secondary air, the outer secondary air duct 22 is sleeved outside the inner secondary air duct 21, and the combustion method further comprises guiding the outer secondary air of the inner secondary air to be mixed with the outer secondary air by using the separation duct 3.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.

Claims (11)

1. A cyclonic burner comprising:
the primary air pipe (1) is used for outputting primary air;
the inner secondary air pipe (21) is sleeved outside the primary air pipe (1) and used for outputting inner secondary air;
the separating pipe (3) is sleeved between the inner secondary air pipe (21) and the primary air pipe (1) and is used for separating the passing inner secondary air into inner secondary air side air flowing through a flow channel between the separating pipe (3) and the primary air pipe (1) and inner secondary air side air flowing through a flow channel between the separating pipe (3) and the inner secondary air pipe (21);
the adjusting device (4) comprises a driving part and a plurality of blades (41) which are arranged between the separating pipe (3) and the primary air pipe (1) and have adjustable inclination angles, the blades (41) are distributed along the circumferential direction of the primary air pipe (1), and the driving part is used for driving the blades (41) to rotate around respective rotating axes so as to adjust the inclination angles.
2. A cyclone burner according to claim 1, wherein the adjusting device further comprises a plurality of rotating shafts (412) fixedly connected to the plurality of vanes (41) in a one-to-one correspondence manner, the driving part comprises an annular body (42) sleeved outside the primary air duct (1) and a plurality of link mechanisms (43) corresponding to the plurality of vanes (41) in a one-to-one correspondence manner, one end of each link mechanism (43) is connected to the annular body (42), the other end of each link mechanism (43) is fixedly connected to the rotating shaft (412) connected to the corresponding vane (41), and the driving part is configured to drive the plurality of link mechanisms (43) to rotate the rotating shaft (412) connected to the corresponding vane (41) by the movement of the annular body (42) so as to adjust the inclination angle of the corresponding vane (41).
3. A cyclone burner as claimed in claim 2 wherein the linkage mechanism (43) comprises a first rod (431) and a second rod (432), a first end of the first rod (431) is hinged to the annular body (42), a second end of the first rod (431) is hinged to a first end of the second rod (432), and a second end of the second rod (432) is fixedly connected to the rotary shaft (412) connected to the vane (41) corresponding to the linkage mechanism (43).
4. A cyclone burner according to claim 3 wherein the shaft (412) is hingedly connected to the separate tube (3) and the annular body (42) is disposed around the separate tube (3).
5. A cyclone burner according to claim 3 wherein the plurality of vanes (41) are positioned at the same position in the axial direction of the primary air duct (1), the working surfaces of the vanes (41) for flowing the inner secondary air and the side air are flat, the plurality of vanes (41) have a flush state, the plurality of vanes (41) are connected to each other to form an annular plate when the driving part drives the plurality of vanes (41) to rotate to the flush state, and the working surfaces of the plurality of vanes (41) are flush with each other to form an annular surface.
6. A cyclonic burner as in claim 1, further comprising:
and the outer secondary air pipe (22) is sleeved outside the inner secondary air pipe (21) and used for outputting outer secondary air, and the separation pipe (3) is configured to lead out the outer secondary air of the inner secondary air to be mixed with the outer secondary air.
7. A cyclone burner according to claim 6 wherein the separator tube (3) comprises a straight tube section (31) surrounding the primary air duct (1) and a diverging tube section (32) downstream of the straight tube section (31) in the direction of flow of the secondary air outside the primary air duct.
8. A cyclone burner according to any one of claims 1-7, characterized in that the cyclone burner comprises a concentration separation device (7) arranged in the primary air duct (1), said concentration separation device (7) being adapted to separate the primary air into a radially outer concentrated primary air and a radially inner dilute primary air in the primary air duct (1).
9. A boiler, comprising a cyclone burner according to any of claims 1 to 7.
10. A combustion method using the cyclone burner as claimed in any one of claims 1 to 7, comprising:
introducing primary air into the primary air pipe (1);
introducing inner secondary air into the inner secondary air pipe (21), and dividing the inner secondary air into inner secondary air inner side air and inner secondary air outer side air by using the separation pipe (3);
when the pulverized coal of the primary air is changed into pulverized coal with low volatile component, the driving part is utilized to drive the plurality of blades (41) to adjust the inclination angle so as to increase the rotational flow strength of the inner secondary air and reduce the flow proportion of the inner secondary air to the inner secondary air;
when the pulverized coal of the primary air is changed into pulverized coal with high volatile, the driving part is utilized to drive the blades to adjust the inclination angle so as to reduce the rotational flow intensity of the inner secondary air and increase the flow proportion of the inner secondary air to the inner secondary air.
11. A combustion method according to claim 10, wherein the cyclone burner further comprises an outer secondary air duct (22) for outputting outer secondary air, the outer secondary air duct (22) is sleeved outside the inner secondary air duct (21), the separation duct (3) is configured to guide the outer secondary air of the inner secondary air to be mixed with the outer secondary air, and the combustion method further comprises introducing outer secondary air into the outer secondary air duct (22).
CN202010897864.3A 2020-08-31 2020-08-31 Cyclone burner, boiler and combustion method Pending CN111878803A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN202010897864.3A CN111878803A (en) 2020-08-31 2020-08-31 Cyclone burner, boiler and combustion method

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112902177A (en) * 2021-02-07 2021-06-04 哈尔滨工业大学 Device for increasing solid waste burnout by adopting chemical crude synthesis gas
CN113932220A (en) * 2021-10-19 2022-01-14 重庆赛迪热工环保工程技术有限公司 Adjustable swirl vane assembly and flat flame burner comprising same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112902177A (en) * 2021-02-07 2021-06-04 哈尔滨工业大学 Device for increasing solid waste burnout by adopting chemical crude synthesis gas
CN113932220A (en) * 2021-10-19 2022-01-14 重庆赛迪热工环保工程技术有限公司 Adjustable swirl vane assembly and flat flame burner comprising same
CN113932220B (en) * 2021-10-19 2023-08-15 重庆赛迪热工环保工程技术有限公司 Adjustable swirl vane assembly and flat flame combustor comprising same

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