CN209084751U - A kind of controllable coal burner of ignition heat - Google Patents
A kind of controllable coal burner of ignition heat Download PDFInfo
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- CN209084751U CN209084751U CN201821220611.7U CN201821220611U CN209084751U CN 209084751 U CN209084751 U CN 209084751U CN 201821220611 U CN201821220611 U CN 201821220611U CN 209084751 U CN209084751 U CN 209084751U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model discloses a kind of controllable coal burners of ignition heat, including central air hose, First air channel, inner second air channel, outer second air channel, coal dust classifier and pulverized coal concentrator, First air channel, inner second air channel, outer second air channel are set gradually outside central air hose, the outlet end of the centrally disposed air hose of coal dust classifier, powder inspissator are arranged on First air channel；The exit in First air channel is provided with combustion stabilizing body, and combustion stabilizing body is wedge block, is arranged on the inner wall in First air channel, and combustion stabilizing body has the circumferential direction along First air channel to be uniformly distributed.The burner of the utility model is by adjusting the shape of combustion stabilizing body and the outlet port of inside and outside Secondary Air and reamer angle, control the size in burner outlet high temperature gases recirculating region, create the burning condition of strong inverse flow hypoxemia fuel-rich, realize that the ignition heat of coal dust is controllable, the stability and reliability of guarantee system, and reach the combustion efficiency of low NOx.
Description
Technical field
The utility model belongs to coal powder burning technology field, and in particular to a kind of ignition heat for meager coal, colm can
Control vortex burner.
Background technique
China's coal is changeable, and different types of coal constitutive property differs greatly, this all chooses low nitrogen burning medelling push belt
War.Meager coal and colm low especially for fugitive constituent, ash content is high, low nitrogen burning transformation after, occur burner nozzle and near
Water-cooling wall coking, kindling and steady combustion property are poor, and efficiency of combustion is low, the various problems such as furnace outlet NOx emission height.
As to the increasingly stringent of power station coal contaminants emission control, eddy flow low NO structure is more, and burns
Control is mainly completed by using low-NOx combustor plus furnace internal classification combustion technology in the process.Fractional combustion makes winner
Oxygen deprivation ignition in combustion zone forms reducing atmosphere, inhibits NOx to generate, uncompleted burned carbon is in burnout degree region after afterflame
It burns.Patent CN203927901U proposes " low nitrogen pulverized coal cyclone burner " and passes through control First air, secondary air channel spout
The angle of tangential vane in reamer angle and secondary air duct forms reasonable high temperature gases recirculating area in combustion centre, makes coal dust
Kindling, combustion with meagre oxygen in high-temperature flue gas region.Realizing reduces nitrogen oxides and achievees the purpose that the efficient after-flame of coal dust.Patent
CN106051759 A proposes multi-stage separation central backflow formula axial rotational flow burner.Main burning air is divided into Secondary Air, three times
Wind and four wind promote to form a recirculating zone in nearly burner region, and complete in remote burner region to increase air classification degree
At the burning of uncompleted burned carbon.201517769 U of utility model patent CN proposes the leaf that mounted angle is 15 °~45 ° on axle sleeve
Piece is inhibited the generation of NOx by inertial separation and centrifuge separation, is mounted with 15 ° of First air reamer angle in First air channel
~25 °, 20 °~30 ° of Secondary Air reamer are installed in the channel Secondary Air I, avoid the overlap of burner and intersect burning.It can see
Out, in order to solve the problems, such as the furnace outlet NOx emission of colm, generally use at present be reinforce primary and secondary air eddy flow it is strong
Degree strengthens air classification degree, or strengthens the mode that coal powder light-dark separates and carry out.It is practical since domestic coal varitation is too big
It is larger to run the coal coal quality deviation that uses, above-mentioned patent does not consider low nitrogen burning mode (i.e. main burner region hypoxemia, low
Temperature) under meager coal, colm kindling in time and stability problem.
Summary of the invention
In view of the deficienciess of the prior art, the purpose of the utility model is to provide a kind of controllable swirl flow combustions of ignition heat
Device, solves that the steady combustion property of kindling when existing vortex burner uses meager coal, colm is poor, efficiency of combustion is low, furnace outlet
The high problem of NOx emission.
In order to solve the above-mentioned technical problem, the utility model adopts the following technical solution is achieved:
A kind of controllable coal burner of ignition heat, including it is central air hose, First air channel, inner second air channel, outer secondary
It is logical to set gradually First air channel, inner second air outside the central air hose for wind channel, pulverized coal distributor and pulverized coal concentrator
Road, outer second air channel, the outlet end of the centrally disposed air hose of the pulverized coal distributor, the pulverized coal concentrator setting exist
On First air channel；The inner second air channel exit is connected with inner second air reamer, and outer second air channel exit connects
It is connected to outer second air reamer；The exit in the First air channel is provided with combustion stabilizing body, and the combustion stabilizing body is arranged primary
On the inner wall in wind channel, the combustion stabilizing body has multiple, and the circumferential direction along First air channel is uniformly distributed；The combustion stabilizing body is wedge
The radial height of shape block, the wedge block is gradually increased along First air channel interior to exit；
The angle of the axis of the inner second air reamer and inner second air channel is 10 °~25 °；The outer second air
The angle of reamer and the axis in outer second air channel is 15 °~35 °.
Further, all wedge blocks along First air channel circumferential direction width be First air channel perimeter 35%~
75%；Each wedge block is the 25%~45% of First air channel diameter along the height of First air channel radial direction.
Further, the pulverized coal distributor is close to the end face of First air channel outlet apart from First air channel outlet
Distance be 80~150mm.
Further, water-cooling wall, the First air channel exit and water are provided with outside the outer second air channel
The axial distance of cold wall wall surface is 30~100mm；The axial distance of inner second air channel exit and water-cooling wall wall surface is 10~
80mm；The exit in outer second air channel and water-cooling wall wall surface are located on same sagittal plane.
Further, the inner second air feeder connection is nearby provided with the first blade, two including the setting of the first blade
Between secondary wind vias inner walls and First air channel outer wall, the first blade is circumferentially uniformly distributed along inner second air channel；Described is outer
The entrance of secondary air channel is provided with the second blade, and the second blade is arranged on outer secondary air channel inner wall, and with interior two
Secondary wind channel outer wall does not contact, and the second blade is circumferentially uniformly distributed along inner second air channel.
Compared with prior art, the utility model has the beneficial effects that
The burner of the utility model is by adjusting the shape of combustion stabilizing body and outlet port and the reamer of inside and outside Secondary Air
Angle postpones primary and secondary air incorporation time, controls the size in burner outlet high temperature gases recirculating region, and it is low to create strong inverse flow
The burning condition of oxygen fuel-rich realizes that the ignition heat of coal dust is controllable, guarantees the stability and reliability of system, and reaches low NOx
Combustion efficiency, specifically:
(1) the utility model on the inner wall in First air channel by being arranged wedge-shaped combustion stabilizing body, by rationally designing wedge shape
The radial height and axial width of combustion stabilizing body, so that it is high to independently form multiple thick coal culms on First air and Secondary Air boundary circumference
The seed region of fugitive constituent strong inverse flow volume smoking gas, and then reach the better ignition to colm.
(2) the utility model controls recirculating zone by the rational design of the inside and outside Secondary Air reamer angle of change and position
Width can prevent air-flow from extending out and whitewash a wall, and cause uncombusted coal dust patch wall burning, can effectively avoid water-cooling wall coking and high temperature
The problem of corrosion.
(3) relative to traditional burner, the First air channel outlet position of the burner of the utility model extend to away from
At 30~100mm of water-cooling wall wall surface, primary and secondary air mixing is postponed, prevents First air premature and relatively low secondary of temperature
Wind mixing.Coal dust is just inhaled the high-temperature flue gas come with volume once ejection and is mixed, and coal dust is under conditions of low temperature, hypoxemia, high concentration, fastly
Speed fight stablize burning, realize strengthen coal powder ignition and inhibit NOx be initially generated.
Other feature and advantage of the utility model will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
Fig. 1 is the overall structure diagram of the utility model.
Fig. 2 is the sectional view of the combustion stabilizing body of the utility model.
Each label indicates in figure are as follows: 1- central air hose, 2- First air channel, 3- inner second air channel, 4- outer second air are logical
Road, 5- pulverized coal distributor, 6- pulverized coal concentrator, 7- inner second air reamer, 8- outer second air reamer, 9- combustion stabilizing body, 10- water cooling
Wall, the first blade of 11-, the second blade of 12-.
Explanation is further explained in detail below in conjunction with particular content of the drawings and specific embodiments to the utility model.
Specific embodiment
Be given below specific embodiment of the present utility model, it should be noted that the utility model be not limited to it is following
Specific embodiment, all equivalent transformations made on the basis of the technical solutions of the present application each fall within the protection scope of the utility model.
In the present invention, in the absence of explanation to the contrary, the noun of locality used such as " upper and lower " typically refer to
It is defined on the basis of the drawing of respective drawings, " inside and outside " refers to the inner and outer of corresponding component profile, and " forward and backward " is with burner
It is defined on the basis of the flow direction of apoplexy.
As shown in Figure 1, the utility model discloses a kind of controllable coal burner of ignition heat, including it is central air hose 1, primary
Wind channel 2, inner second air channel 3, outer second air channel 4, pulverized coal distributor 5 and pulverized coal concentrator 6, outside central air hose 1 according to
Secondary setting First air channel 2, inner second air channel 3, outer second air channel 4, the centrally disposed air hose 1 of pulverized coal distributor 5 go out
Mouth end, pulverized coal concentrator 6 are arranged on First air channel 2, and pulverized coal concentrator 6 and pulverized coal distributor 5 are successively along the flow direction of wind
Front and back setting, wherein pulverized coal concentrator 6 is venturi pulverized coal concentrator, and combining with pulverized coal distributor 5 makes breeze airflow in spout
Outer dense interior light annular coal powder density is formd on section, which keeps peripheral coal powder density big, the volatilization diversity of precipitation
In, be conducive to low-volatite coal stable ignition.
3 exit of inner second air channel is connected with inner second air reamer 7, and 4 exit of outer second air channel is connected with outer two
Secondary wind reamer 8；The exit in First air channel 2 is provided with combustion stabilizing body 9, and combustion stabilizing body 9 is arranged on the inner wall in First air channel 2,
In the present embodiment, combustion stabilizing body 9 has 8, and the circumferential direction along First air channel 2 is uniformly distributed.Specifically, combustion stabilizing body 9 is wedge block,
The radial height of wedge block gradually increases inside First air channel 2 to exit.
3 entrance of inner second air channel is provided with the first blade 11, and the first blade 11 is arranged in interior secondary air channel 3
Between 2 outer wall of wall and First air channel, the first blade 11 is circumferentially uniformly distributed along inner second air channel 3, and the first blade 11 is used for
The swirl strength for adjusting inner second air, the volume for controlling inner second air inhale intensity and air-flow rigidity.The entrance in outer second air channel 4 is attached
Closely be provided with the second blade 12, the second blade 12 is arranged on outer 4 inner wall of secondary air channel, and with 3 outer wall of inner second air channel
It does not contact, the second blade 12 is circumferentially uniformly distributed along inner second air channel 3, and the second blade 12 is used to adjust the eddy flow of outer second air
Intensity.
In actual use, the internal shell structure with cavity can be set by wedge block according to actual needs.
Preferably, wedge block is the 35%~75% of 2 perimeter of First air channel along the circumferential width in First air channel 2, wedge
Shape block is the 25%~45% of 2 diameter of First air channel along the radial height in First air channel 2, steady by rationally designing wedge shape
The radial height and axial width for firing body, are waved so that independently forming multiple thick coal culm height on First air and Secondary Air boundary circumference
The seed region of part strong inverse flow volume smoking gas is sent out, and then reaches the better ignition to colm.In the particular embodiment,
8 are provided with, is inhaled so that independently forming 8 thick coal culm high-volatile strong inverse flow volumes on First air and Secondary Air boundary circumference
The seed region of flue gas, and then reach the better ignition to colm.
Preferably, pulverized coal distributor 5 close to 2 outlet end of First air channel end face apart from First air channel 2 export away from
Coal powder ignition is controlled so that First air ejiction opening forms stable high temperature recirculation zone from for 80~150mm.
Be provided with water-cooling wall 10 outside outer secondary air channel 4,2 exit of First air channel and water-cooling wall wall surface it is axial away from
Primary and secondary air mixing is postponed from for 30~100mm to enhance primary air jet rigidity.Prevent First air outlet coal dust once spray
Out not in contact with arrive high-temperature flue gas, just the premature Secondary Air relatively low with temperature mix, reduction First air in coal dust concentration with
Temperature and be unfavorable for catching fire.Primary and secondary air mixing is postponed, prevents the lower Secondary Air of temperature is premature to be mixed into combustion zone,
Coal dust ignition under anoxic conditions, advantageously reduces being initially generated for NOx.
The axial distance of 3 exit of inner second air channel and water-cooling wall wall surface is 10~80mm, can postpone inside and outside Secondary Air
Incorporation time, the angle of the axis in inner second air reamer 7 and inner second air channel 3 is 10 °~25 °；Outer second air channel 4
Exit and water-cooling wall wall surface are located on same sagittal plane, and outer second air reamer 8 and the angle of the axis in outer second air channel 4 are
15 °~35 °, inside and outside Secondary Air is in that spiral-flow type outer expanding shape penetrating burner hearth is combustion-supporting, as shown in Figure 1, water-cooling wall includes inclined-plane and edge
The radial sagittal plane in outer second air channel 4, above-mentioned distance refer to the distance between water-cooling wall sagittal plane.By above-mentioned inside and outside
The reamer of Secondary Air and the rational design of outlet port, the air-flow of formation is rigidly strong, prevents the adherent burning of uncombusted coal dust, favorably
Water-cooling wall coking problem near improvement spout and in furnace.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, it can be combined in any appropriate way, it is same as long as it is without prejudice to the thought of the utility model
It should be considered as content disclosed in the utility model.
Claims (5)
1. a kind of controllable coal burner of ignition heat, including central air hose (1), First air channel (2), inner second air channel (3),
Outer second air channel (4), pulverized coal distributor (5) and pulverized coal concentrator (6), the central air hose (1) is external to set gradually one
Secondary wind channel (2), inner second air channel (3), outer second air channel (4), the pulverized coal distributor (5) centrally disposed air hose
(1) outlet end, the pulverized coal concentrator (6) are arranged on First air channel (2)；The inner second air channel (3) goes out
It is connected with inner second air reamer (7) at mouthful, outer second air channel (4) exit is connected with outer second air reamer (8)；Described one
The exit of secondary wind channel (2) is provided with combustion stabilizing body (9), it is characterised in that:
The combustion stabilizing body (9) is arranged on the inner wall of First air channel (2), the combustion stabilizing body (9) have it is multiple, along First air
The circumferential direction in channel (2) is uniformly distributed；The combustion stabilizing body (9) is wedge block, and the radial height of the wedge block is along First air channel
(2) inside to exit gradually increases；
The angle of the axis of the inner second air reamer (7) and inner second air channel (3) is 10 °~25 °；Described is outer secondary
The angle of wind reamer (8) and the axis of outer second air channel (4) is 15 °~35 °.
2. the controllable coal burner of ignition heat as described in claim 1, which is characterized in that all wedge blocks are logical along First air
The width of road (2) circumferential direction is the 35%~75% of First air channel (2) perimeter；Each wedge block is radial along First air channel (2)
Height be First air channel (2) diameter 25%~45%.
3. the controllable coal burner of ignition heat as described in claim 1, which is characterized in that the pulverized coal distributor (5) leans on
The end face of nearly First air channel (2) outlet end is 80~150mm apart from the distance that First air channel (2) export.
4. the controllable coal burner of ignition heat as described in claim 1, which is characterized in that the outer second air channel (4)
It being provided with water-cooling wall (10) outside, the axial distance of First air channel (2) exit and water-cooling wall wall surface is 30~
100mm；The axial distance of inner second air channel (3) exit and water-cooling wall wall surface is 10~80mm；Outer second air channel (4)
Exit and water-cooling wall wall surface are located on same sagittal plane.
5. the controllable coal burner of ignition heat as described in claim 1, which is characterized in that the inner second air channel (3)
Entrance is provided with the first blade (11), and the first blade (11) is arranged in interior secondary air channel (3) inner wall and First air channel
(2) between outer wall, the first blade (11) is circumferentially uniformly distributed along inner second air channel (3)；The outer second air channel (4)
Entrance is provided with the second blade (12), the second blade (12) be arranged on outer secondary air channel (4) inner wall, and with it is interior secondary
Wind channel (3) outer wall does not contact, and the second blade (12) is circumferentially uniformly distributed along inner second air channel (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821220611.7U CN209084751U (en) | 2018-07-30 | 2018-07-30 | A kind of controllable coal burner of ignition heat |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821220611.7U CN209084751U (en) | 2018-07-30 | 2018-07-30 | A kind of controllable coal burner of ignition heat |
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| Publication Number | Publication Date |
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| CN209084751U true CN209084751U (en) | 2019-07-09 |
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| CN201821220611.7U Active CN209084751U (en) | 2018-07-30 | 2018-07-30 | A kind of controllable coal burner of ignition heat |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111828960A (en) * | 2020-07-23 | 2020-10-27 | 郑州轻工业大学 | Adjustable coal powder burner with gradation |
-
2018
- 2018-07-30 CN CN201821220611.7U patent/CN209084751U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111828960A (en) * | 2020-07-23 | 2020-10-27 | 郑州轻工业大学 | Adjustable coal powder burner with gradation |
| CN111828960B (en) * | 2020-07-23 | 2023-04-07 | 郑州轻工业大学 | Adjustable coal powder burner with gradation |
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