CN105737139B - Boiler - Google Patents
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- Publication number
- CN105737139B CN105737139B CN201610232520.4A CN201610232520A CN105737139B CN 105737139 B CN105737139 B CN 105737139B CN 201610232520 A CN201610232520 A CN 201610232520A CN 105737139 B CN105737139 B CN 105737139B
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- Prior art keywords
- air
- boiler
- nozzle
- coal dust
- opposed
- Prior art date
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- 239000002817 coal dust Substances 0.000 claims abstract description 101
- 239000003245 coal Substances 0.000 claims abstract description 83
- 238000009826 distribution Methods 0.000 claims abstract description 7
- 239000007921 spray Substances 0.000 claims description 20
- 238000005507 spraying Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 description 14
- 239000000843 powder Substances 0.000 description 10
- 238000002485 combustion reaction Methods 0.000 description 8
- 238000004939 coking Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010304 firing Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011017 operating method Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
Classifications
-
- 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
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/02—Disposition of air supply not passing through burner
-
- 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
- F23C2201/00—Staged combustion
- F23C2201/30—Staged fuel supply
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention discloses a kind of boilers, the boiler includes the opposed nozzle of multiple groups First air of the circumferentially-spaced distribution along the boiler, the opposed nozzle of First air described in every group includes the two First air nozzles (1) arranged in opposite directions along the radial direction of the boiler, and the First air nozzle (1) can eject dense phase pulverized coal and light phase coal dust；In the opposed nozzle of First air described in every group, the two bursts of dense phase pulverized coals ejected in opposite directions radially liquidate, and two ejected in opposite directions strand light phase coal dust is respectively formed at the outside of the dense phase pulverized coal radially to liquidate；The opposed nozzle of First air described in multiple groups is configured to so that dense phase pulverized coal described in multiply is collected at the boiler center (O) of the boiler liquidates, and the respective flow direction of light phase coal dust described in multiply is made to be respectively with the corresponding outer tangential direction for the first center circle (11) that the boiler center (O) is the center of circle.The boiler can be realized stablizing for coal dust and burn, and improve the reliability, high efficiency and economy of boiler.
Description
Technical field
The present invention relates to boiler coal-ash combustors, and in particular, to a kind of boiler.
Background technique
Currently, the station boiler in China is mainly using coal dust as fuel.But it is supplied when being burnt in the boiler due to coal dust
Air capacity is insufficient or air undercompounding so that completely burned is not achieved in coal dust is easy to produce carbon monoxide, thus keeps ash molten
Point substantially reduces, and since firing optimization is improper or the defect of boiler can often cause eccentricity of fire, so that in the flame of the highest temperature
The heart is transferred to furnace wall nearby, and boiler and the water-cooling wall being arranged on boiler inner wall can all be made serious coking occur.This will
Leading to the efficiency of boiler reduces, and also will have a direct impact on the power output of boiler, even will cause accident when serious.
Summary of the invention
The object of the present invention is to provide a kind of boiler, what which can be realized coal dust stablizes burning, and that improves boiler can
By property, high efficiency and economy.
To achieve the goals above, the present invention provides a kind of boiler, and the boiler includes along circumferentially-spaced point of the boiler
The opposed nozzle of multiple groups First air of cloth, the opposed nozzle of First air described in every group include along the boiler radial direction arrange in opposite directions two
A First air nozzle, the First air nozzle can eject dense phase pulverized coal and light phase coal dust；The First air described in every group is opposed
In nozzle, the two bursts of dense phase pulverized coals ejected in opposite directions radially liquidate, and two ejected in opposite directions strand light phase coal dust
It is respectively formed at the outside of the dense phase pulverized coal radially to liquidate；The opposed nozzle of First air described in multiple groups is configured to so that more
The stock dense phase pulverized coal collects the respective flow direction for liquidating, and making light phase coal dust described in multiply at the boiler center of the boiler
Respectively using the boiler center as the corresponding outer tangential direction of first center circle in the center of circle.
Preferably, the First air nozzle include surrounded by First air nozzle body the First air nozzle chamber that is formed and
Bluff body in the First air nozzle chamber is set, which is divided into the First air nozzle chamber as concentrated phase coal
Two independent channels in powder channel and light phase coal dust channel, the side wall of the light phase coal dust channel is along the First air nozzle housing
The outside deflection of the axial direction of body extends, and the side wall in the dense phase pulverized coal channel is in the axial direction side along the First air nozzle body
To extension.
Preferably, the boiler includes the spaced apart opposed nozzle of multilayer First air of short transverse along the boiler, often
The layer opposed nozzle of First air includes the opposed nozzle of multiple groups First air of the circumferentially-spaced distribution along the boiler；The boiler
It further include the spaced apart opposed nozzle of multilayer Secondary Air of short transverse along the boiler, the opposed nozzle of multilayer First air and multilayer
The opposed nozzle of Secondary Air is along the layer-by-layer interlaced arrangement of short transverse.
Preferably, the light phase coal dust channel of every layer of opposed nozzle of First air is along clockwise direction or square counterclockwise
It is arranged to deflection.
Preferably, the overfire air jet includes surrounding the overfire air jet inner cavity formed by overfire air jet shell, should
Overfire air jet inner cavity is Secondary Air main air duct, and side wind channel is formed in the overfire air jet shell, the side wind
Channel is connected with hollow extension pipeline section in the outlet air end of the overfire air jet, which is parallel to the interior of the boiler
Wall is stretched out to eject circumferential Secondary Air, to form the circumferential brattice for protecting the inner wall of the boiler.
Preferably, the opposed nozzle of Secondary Air described in multilayer be configured to so that the Secondary Air main air duct blowout it is secondary
The respective flow direction of wind is respectively using the boiler center as the corresponding outer tangential direction of second center circle in the center of circle.
Preferably, second center diameter of a circle is greater than first center diameter of a circle, and is less than the boiler
Diameter.
Preferably, side wind channel includes the transverse direction setting along the overfire air jet in Secondary Air main air duct
Two sides first side wind channel and second side wind channel, first side wind channel and second side wind channel
Longitudinal center axis about the overfire air jet is arranged symmetrically.
Preferably, on the cross section of the overfire air jet, be also formed at the top of the overfire air jet with it is described
Multiple Secondary Air accessory channels that Secondary Air main air duct separates.
Preferably, the overfire air jet includes six auxiliary wind channels, and six auxiliary wind channels exist
Two horizontally-arranged and three perpendicular column are arranged as above the Secondary Air main air duct.
Through the above technical solutions, boiler of the present invention by using tangential firing, First air nozzle is designed as deep or light
Coal dust is separated into dense by unpack format, the coal dust that wherein First air carries by carrying out air-coal separating when First air nozzle
Phase coal dust and light phase coal dust, in every group of First air nozzle, the two bursts of dense phase pulverized coals ejected in opposite directions radially liquidate, in opposite directions
The light phase coal dust of two strands ejected is respectively formed at the outside of the dense phase pulverized coal radially to liquidate, so that the First air described in multiple groups
In opposed nozzle, multiply dense phase pulverized coal is collected at the boiler center of boiler to liquidate, and the respective flow direction of the light phase coal dust of multiply is respectively
Using boiler center as the corresponding outer tangential direction of first center circle in the center of circle, so that light phase coal dust first occurs instead with air
It answers, heat is released in burning, lights the dense phase pulverized coal that inside liquidates.The operating method of pulverized coal bias combustion of the invention is by light phase
Coal dust first catches fire, and the dense phase pulverized coal for then lighting inside improves the reliable of boiler to reach the steady fuel efficiency fruit of coal dust in boiler
Property, high efficiency and economy.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
The drawings are intended to provide a further understanding of the invention, and constitutes part of specification, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of First air nozzle according to the preferred embodiment of the present invention；
Fig. 2 is cross-sectional view of the First air nozzle along line A-A of Fig. 1；
Fig. 3 is cross-sectional view of the First air nozzle along line B-B of Fig. 1；
Fig. 4 is the structural schematic diagram of overfire air jet according to the preferred embodiment of the present invention；
Fig. 5 is cross-sectional view of the overfire air jet along line C-C of Fig. 4；
Fig. 6 is cross-sectional view of the overfire air jet along line D-D of Fig. 4；
Fig. 7 is the structural schematic diagram of middle boiler according to the preferred embodiment of the present invention.
Description of symbols
1 First air nozzle, 2 overfire air jet
3 side wind channel, 11 first center circle
The light phase coal dust channel in 12 dense phase pulverized coal channel 13
14 bluff body O boiler centers
21 Secondary Air main air duct, 22 extension pipeline section
23 second center circle, 24 Secondary Air accessory channel
31 first side wind channel, 32 second side wind channel
100 No.1 First air nozzle, 101 No.1 dense phase pulverized coal
The light 110 No.1 Secondary Air of phase coal dust of 102 No.1s
200 No. two First air nozzles, 201 No. two dense phase pulverized coals
202 No. two light phase coal dusts, 210 No. two Secondary Airs
300 No. three First air nozzles, 301 No. three dense phase pulverized coals
302 No. three light phase coal dusts, 310 No. three Secondary Airs
400 No. four First air nozzles, 401 No. four dense phase pulverized coals
402 No. four light phase coal dusts, 410 No. four Secondary Airs
Specific embodiment
Below in conjunction with attached drawing, detailed description of the preferred embodiments.It should be understood that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
In the present invention, in the absence of explanation to the contrary, the noun of locality used is usually directed to attached drawing as " upper and lower "
Shown in for direction either for it is vertical, on vertical or gravity direction for each component mutual alignment relation description use
Word；" longitudinal direction " direction can correspond to vertical direction, and " transverse direction " direction can correspond to horizontal direction, " central axis " and institute
The whole direction for stating overfire air jet or the First air nozzle is parallel.
It should be noted that since station boiler is presently mainly using coal dust as fuel, in the following description,
In a manner of infinite, only using " coal dust " as fuel for be described in detail.
The structural schematic diagram of boiler according to the preferred embodiment of the present invention is shown referring to Fig. 7, Fig. 7.Wherein, the pot
Furnace includes the opposed nozzle of multiple groups First air of the circumferentially-spaced distribution along the boiler, and every group of opposed nozzle of First air includes along boiler
Two First air nozzles 1 arranging in opposite directions of radial direction, First air nozzle 1 can eject dense phase pulverized coal and light phase coal dust；Every
In the group opposed nozzle of First air, the two bursts of dense phase pulverized coals ejected in opposite directions radially liquidate, and the light phase of two ejected in opposite directions burst
Coal dust is respectively formed at the outside of the dense phase pulverized coal radially to liquidate；The opposed nozzle of multiple groups First air is configured to so that multiply is dense
Phase coal dust collects in the boiler center O of boiler to liquidate, and the respective flow direction of the light phase coal dust of multiply is made to be respectively in boiler
Heart O is the corresponding outer tangential direction of first center circle 11 in the center of circle.
First air nozzle 1 is designed as air-coal separating form, wherein once by using the boiler of tangential firing by the present invention
The coal dust that wind carries carries out air-coal separating when passing through First air nozzle 1, and coal dust is separated into dense phase pulverized coal and light phase coal dust,
In every group of First air nozzle 1, the two bursts of dense phase pulverized coals ejected in opposite directions radially liquidate, the light phase of two ejected in opposite directions burst
Coal dust is respectively formed at the outside of the dense phase pulverized coal radially to liquidate, so that in the opposed nozzle of multiple groups First air, multiply concentrated phase
Coal dust collects in the boiler center O of boiler to liquidate, and the respective flow direction of the light phase coal dust of multiply is respectively using boiler center O as the center of circle
The corresponding outer tangential direction of first center circle 11, so that light phase coal dust first reacts with air, heat, point are released in burning
The dense phase pulverized coal that combustion inside liquidates.The operating method for the pulverized coal bias combustion that boiler of the invention uses is by light phase coal dust elder generation
Fire, then light inside dense phase pulverized coal, to play the steady fuel efficiency fruit of coal dust in boiler, improve boiler reliability, efficiently
Property and economy.
Particularly, show referring to the structure that Fig. 1 to Fig. 3, Fig. 1 are First air nozzles according to the preferred embodiment of the present invention
It is intended to；Fig. 2 is cross-sectional view of the First air nozzle along line A-A of Fig. 1；Fig. 3 is cross-sectional view of the First air nozzle along line B-B of Fig. 1.
Wherein, First air nozzle 1 includes surrounding the First air nozzle chamber formed by First air nozzle body and being arranged in First air
First air nozzle chamber is divided into as dense phase pulverized coal channel 12 and light phase coal by the bluff body 14 in nozzle chamber, the bluff body 14
Two independent channels in powder channel 13, the side wall of light phase coal dust channel 13 are inclined outward along the axial direction of First air nozzle body
The side wall of tiltedly setting, dense phase pulverized coal channel 12 extends along the axial direction of First air nozzle body.
Wherein, First air nozzle 1 is connect with primary air piping, dense-and-weak separator is wherein equipped in primary air piping, in the present invention
A kind of embodiment in, the dense-and-weak separator be upper and lower dense-and-weak separator, particularly, the upper and lower dense-and-weak separator be with it is primary
The central transverse axis of wind nozzle body is in the tilted angle the guide plate of setting, which is divided into two up and down for primary air piping
Channel, the area that flows through for being located above channel flows through area less than down channel, so that light phase coal dust is formed in upper run,
Down channel forms dense phase pulverized coal；It is connected again due to guide plate with the bluff body 14 in First air nozzle chamber, wherein First air sprays
14 First air nozzle chamber of bluff body in mouth inner cavity is also classified into two channels up and down, so that being flowed out by the upper run of primary air piping
Light phase stream powder by First air nozzle 1 upper run spray, by primary air piping down channel flow out concentrated phase stream powder by one
The down channel of secondary wind nozzle 1 sprays.
Since the side wall in dense phase pulverized coal channel 12 extends along the axial direction of First air nozzle body, so that First air
The dense phase pulverized coal of opposed nozzle liquidates；The present invention in order to enable in the opposed nozzle of multiple groups First air, the light phase coal dust of multiply it is each
It is respectively using boiler center O as the corresponding outer tangential direction of first center circle 11 in the center of circle from flow direction.Particularly, the present invention will be light
Axial direction outside deflection setting of the side wall of phase coal dust channel 13 along First air nozzle body.Pass through light phase coal dust channel 13
The setting of side wall deflection, light phase coal dust laterodeviation is sprayed, and light phase coal dust is enclosed at the boiler center O of boiler
Liquidate the dense phase pulverized coal collected.In a preferred embodiment of the invention, the diameter of the first center circle 11 is 650mm.But this hair
Bright to be not limited thereto, design can be adjusted in the diameter of the first center circle 11 according to specific needs of production.
But the present invention is not limited thereto, and horizontal bias separator, the i.e. horizontal bias can also be equipped in primary air piping
Burner is the guide plate of setting of being in the tilted angle with the longitudinal center axis of First air nozzle body, which will be passed through one
The coal dust of secondary air hose is divided into two strands of left and right, and wherein one is dense phase pulverized coal, and another stock is light phase coal dust, and bluff body 14 is also by First air
Nozzle chamber is divided into two or so the independent channels as dense phase pulverized coal channel 12 and light phase coal dust channel 13.Light phase coal dust
The extending direction of the side wall of the skew direction and dense phase pulverized coal channel 12 of the side wall in channel 13 with it is recited above identical,
This is repeated no more.
Particularly, boiler includes the spaced apart opposed nozzle of multilayer First air of short transverse along the boiler, and every layer one
The secondary opposed nozzle of wind includes the opposed nozzle of multiple groups First air of the circumferentially-spaced distribution along boiler；The boiler further includes along the pot
The spaced apart opposed nozzle of multilayer Secondary Air of the short transverse of furnace, the spray opposed with multilayer Secondary Air of the opposed nozzle of multilayer First air
Mouth is along the layer-by-layer interlaced arrangement of short transverse.So that once wind and Secondary Air in each height of the entire burner hearth of boiler,
Wherein, the dense phase pulverized coal of the opposed nozzle of multilayer First air mutually liquidates, and light phase coal dust is with the outer tangential direction of the first center circle 11
Flowing, so that light phase coal dust wraps up dense phase pulverized coal；Secondary Air as combustion air is blown into boiler by the opposed nozzle of multilayer Secondary Air
In, so that coal dust is uniformly mixed in the burner hearth of boiler with combustion air, improve the burning highly effective and economy of boiler.
In order to enable light phase coal dust effectively wraps up dense phase pulverized coal, and particularly, the light phase coal of the opposed nozzle of every layer of First air
Deflection is arranged clockwise or counterclockwise in powder channel 13.So that light phase coal dust can be along with boiler center O
The outer tangential direction of first center circle 11 in the center of circle flows.Referring to Fig. 7, wherein the light phase coal dust of the opposed nozzle of every layer of First air is logical
Deflection extends in the counterclockwise direction in road 13, i.e., light phase coal dust is towards the right side deflection of corresponding dense phase pulverized coal.
Particularly, show referring to fig. 4 to the structure that Fig. 6, Fig. 4 are overfire air jets according to the preferred embodiment of the present invention
It is intended to；Fig. 5 is cross-sectional view of the overfire air jet along line C-C of Fig. 4；Fig. 6 is cross-sectional view of the overfire air jet along line D-D of Fig. 4.
Wherein, overfire air jet 2 includes surrounding the overfire air jet inner cavity formed, the overfire air jet inner cavity by overfire air jet shell
For Secondary Air main air duct 21, and side wind channel 3 is formed in overfire air jet shell, which sprays in Secondary Air
The outlet air end of mouth 2 is connected with hollow extension pipeline section 22, and the inner wall which is parallel to boiler is stretched out to eject week
To Secondary Air, to form the circumferential brattice of the inner wall of protection boiler.
Be equipped with water-cooling wall on the inner wall of usual boiler, water-cooling wall in the event of high temperatures easily coking on the surface thereof or
Cause high temperature corrosion.The present invention is by being connected with hollow extension pipeline section 22 in the outlet air end of overfire air jet 2, so that the extension
The inner wall that pipeline section 22 is parallel to boiler is stretched out to eject circumferential Secondary Air, to form the Zhou Xiangfeng of the inner wall of protection boiler
Wall.Thus avoid the coking and caused by water-cooling wall inner surface on water-cooling wall of the high temperature pulverized coal particle of not completely burned
High temperature corrosion.Extension pipeline section 22 can be relative to central axial direction (the as whole court of overfire air jet of overfire air jet 2
To) the suitable angle of deflection outward, so as to so that the brattice and water-cooling wall inner surface that side wind channel 3 is formed keep basic
In parallel.
The structure in side wind channel 3 can be above-described diversified forms.In a preferred embodiment of the invention, such as
Shown in Fig. 4 and Fig. 5, the outlet shapes in side wind channel 3 are the bar shaped longitudinally extended, therefore can be formed more coherent along vertical
It is more convenient for fabricating to the brattice with certain altitude, and compared to the form of multiple air outlets.
Side wind channel 3 may be formed as one or more longitudinal arrangements, it is preferable that as shown in figure 4, the side wind
Channel 3 includes that the first side wind channel 31 that the two sides of overfire air jet 2 in transverse direction are respectively set and second side wind lead to
Road 32.For the burner hearth of the boiler of quadrangle tangential circle form, the overfire air jet 2 for being arranged in the structure described above at an angle can
To form brattice on adjacent two water-cooling walls at the angle；If only one side wind channel 3, can make to be located at the burner hearth
Each angle at overfire air jet 2 successively form brattice on four water-cooling walls, realize the effect of barrier high temperature coal dust.
Further, the longitudinal direction of first side wind channel 31 and second side wind channel 32 about the overfire air jet 2
Central axis is arranged symmetrically.That is, first side wind channel 31 and second side wind channel 32 are respectively to two sides deflection
Angle is identical, therefore, can be by the whole towards can be with the whole direction of other First air nozzles of the overfire air jet
Unanimously, the Secondary Air that first side wind channel 31 and second side wind channel 32 spray can be on the inside of two adjacent water-cooling walls
Form brattice.
It is particularly preferred that the opposed nozzle of multilayer Secondary Air is configured to so that the Secondary Air that Secondary Air main air duct 21 is blown out
It is respective flow direction be respectively using boiler center O as the corresponding outer tangential direction of second center circle 23 in the center of circle.Wherein, every layer it is secondary
The Secondary Air main air duct 21 of the opposed nozzle of wind deflection can also be arranged clockwise or counterclockwise.Of the invention excellent
It selects in embodiment, deflection is arranged the Secondary Air main air duct 21 of the opposed nozzle of every layer of Secondary Air in the counterclockwise direction.That is Secondary Air
Towards the right side deflection of corresponding dense phase pulverized coal.
Particularly, the diameter of the second center circle 23 is greater than the diameter of the first center circle 11, and is less than the diameter of boiler.I.e.
Secondary Air package contains the First air of light phase coal dust, and the First air containing light phase coal dust wraps up the First air containing dense phase pulverized coal.
It wraps up the First air containing coal dust always by Secondary Air, may make that playing prevents water-cooling wall for oxidizing atmosphere at water-cooling wall
The effect of coking and corrosion.Wherein the diameter of the second center circle 23 can be according to practical boiler furnace size and boiler concrete condition
To determine.
Particularly, on the cross section of overfire air jet 2, the top of overfire air jet 2 is also formed with and the main wind of Secondary Air
Multiple Secondary Air accessory channels 24 that road 21 separates.Specifically, the lower area of overfire air jet 2 is arranged in side wind channel 3,
The upper area of overfire air jet 2 is provided with auxiliary wind channel 24.Certainly, auxiliary wind channel 24 also can be set sprays in Secondary Air
The lower area of mouth 2, and side wind channel 3 is arranged in the upper area of overfire air jet 2.Auxiliary wind channel 24 is mainly used for
Secondary Air is provided and reduces the production quantity of nitrogen oxides to improve low nitrogen effect.
Further, in a preferred embodiment of the invention, the air output in side wind channel 3 is the overfire air jet
The 5-10% of whole air output.The air that side wind channel 3 sprays is primarily used to form brattice, as long as the air capacity sprayed can be with
The inner surface of water-cooling wall can be covered substantially by guaranteeing the area of brattice, therefore the air sprayed by side wind channel 3 can be with
Only account for the very small part of 2 air output of overfire air jet.
In addition, as shown in figure 4, particularly, overfire air jet 2 includes six auxiliary wind channels 24, and six auxiliary wind
Channel 24, which is arranged as two horizontally-arranged and three perpendicular column in the top of Secondary Air main air duct 21, can drop in multiple auxiliary wind channels 24
The Reynolds number of low Secondary Air makes that wind is assisted steadily to be sprayed by auxiliary wind channel 24, prevents auxiliary wind channel 24 from spraying auxiliary
The brattice that the side wind for helping wind impact side wind channel 3 to spray is formed.
The structure that will be detailed below boiler of the invention is the preferred embodiment of the present invention referring to Fig. 7, Fig. 7
The structural schematic diagram of boiler.In the preferred embodiment, which uses Terms of Corner Tangential Combustion, in the quadrangle of boiler
On, there are the opposed nozzle of multilayer First air and the opposed nozzle of multilayer Secondary Air, multilayer one along the short transverse arranged for interval of the boiler
The secondary opposed nozzle of wind nozzle opposed with multilayer Secondary Air is along the layer-by-layer interlaced arrangement of short transverse.The wherein opposed nozzle of every layer of First air
Including two groups of opposed nozzles of First air, every group of opposed nozzle of First air be arranged in two of the quadrangle of boiler it is diagonal on, and every group
The opposed nozzle of First air includes the two First air nozzles 1 arranged in opposite directions along the radial direction of boiler, the i.e. opposed nozzle of every layer of First air
Including four First air nozzles 1；The opposed nozzle of every layer of Secondary Air includes two groups of opposed nozzles of Secondary Air, every group of opposed spray of Secondary Air
Mouth be arranged in two of the quadrangle of boiler it is diagonal on, and every group of opposed nozzle of Secondary Air includes arranging in opposite directions along the radial direction of boiler
Two overfire air jets 2, the i.e. opposed nozzle of every layer of Secondary Air include four overfire air jets 2.In Fig. 7, overfire air jet 2 is set
It sets in the lower section of First air nozzle 1, therefore Fig. 7 does not show overfire air jet 2.
Fig. 7 shows wherein one layer of the opposed nozzle of First air of boiler, for the convenience of description, will be arranged in the four of boiler
First air nozzle 1 on a angle is numbered respectively, respectively 100, No. two First air nozzles 200 of No.1 First air nozzle,
No. three First air nozzles 300 and No. four First air nozzles 400 will also be sprayed dense convenient for description by corresponding First air nozzle
Phase coal dust and light phase coal dust are numbered, and are respectively labeled as No.1 concentrated phase coal by the coal dust that No.1 First air nozzle 100 sprays
Powder 101 and the light phase coal dust 102 of No.1；No. two dense phase pulverized coals 201 are respectively labeled as by the coal dust that No. two First air nozzles 200 spray
With No. two light phase coal dusts 202；No. three dense phase pulverized coals 301 and three are respectively labeled as by the coal dust that No. three First air nozzles 300 spray
Number light phase coal dust 302；No. four dense phase pulverized coals 401 are respectively labeled as by the coal dust that No. four First air nozzles 400 spray and No. four light
Phase coal dust 402.Wherein, No.1 dense phase pulverized coal 101 radially liquidates with No. three dense phase pulverized coals 301, the light phase coal dust 102 and three of No.1
Number light phase coal dust 302 is located at the outside of No.1 dense phase pulverized coal 101 and No. three dense phase pulverized coals 301；No. two 201 Hes of dense phase pulverized coal
No. four dense phase pulverized coals 401 radially liquidate, and No. two light phase coal dusts 202 and No. four light phase coal dusts 402 are located at No. two concentrated phase coals
The outside of powder 201 and No. four dense phase pulverized coals 401.The No.1 dense phase pulverized coal 101 mutually to liquidate in this boiler and No. three concentrated phase coals
Powder 301 and No. two dense phase pulverized coals 201 and No. four dense phase pulverized coals 401 collect at the boiler center O of boiler, the light phase coal of No.1
The light phase coal dust 302 of powder 102, two light phase coal dusts 202, three and No. four light respective flow directions of phase coal dust 402 are respectively along the inverse time
Needle direction (or clockwise) using boiler center O as the corresponding outer tangential direction of first center circle 11 in the center of circle.So that No.1
The light phase coal dust 302 of the light phase coal dust 202, three of light phase coal dust 102, two and No. four light phase coal dusts 402 surround mutually right on the outside
The No.1 dense phase pulverized coal 101 of punching and No. three dense phase pulverized coals 301 and No. two dense phase pulverized coals 201 and No. four dense phase pulverized coals 401, i.e., one
The first center that number light phase coal dust 302 of the light phase coal dust 202, three of light phase coal dust 102, two and No. four light phase coal dusts 402 are formed
Circle 11 wraps the concentrated phase coal of dense phase pulverized coal 201, three of No.1 dense phase pulverized coal 101, two collected at the boiler center O of boiler
Powder 301 and No. four dense phase pulverized coals 401, so that the light phase coal dust of No.1 102, No. two light phase coal dusts, 202, No. three light phase coal dusts
302 and No. four light phase coal dusts 402 be first ignited, heat is released, then again by No.1 102, No. two light phase coal dusts of light phase coal dust
202, No. three light phase coal dusts 302 and No. four light phase coal dusts 402 light 101, No. two dense phase pulverized coals of No.1 dense phase pulverized coal of encirclement
201, No. three dense phase pulverized coals 301 and No. four dense phase pulverized coals 401, have reached the effect surely fired.
Since the overfire air jet 2 in Fig. 7 is separately positioned on the lower section of First air nozzle 1, for ease of description, also by phase
The Secondary Air that the overfire air jet 2 answered sprays is numbered, wherein by being arranged in two below No.1 First air nozzle 100
The Secondary Air that secondary wind nozzle sprays is marked as No.1 Secondary Air 110, and No.1 Secondary Air 110 is located at the light phase coal dust 102 of No.1
Outside；By be arranged in the Secondary Air that overfire air jet below No. two First air nozzles 200 sprays be marked as No. two it is secondary
Wind 210, and No. two Secondary Airs 210 are located at the outside of No. two light phase coal dusts 202；By being arranged in below No. three First air nozzles 300
The Secondary Air that sprays of overfire air jet be marked as No. three Secondary Airs 310, and No. three Secondary Airs 310 are located at No. three light phase coal dusts
302 outside；No. four two are marked as by the Secondary Air that the overfire air jet below No. four First air nozzles 400 sprays is arranged in
Secondary wind 410, and No. four Secondary Airs 410 are located at the outside of No. four light phase coal dusts 402.110, No. two Secondary Airs 210 of No.1 Secondary Air,
No. three Secondary Airs 310 and No. four Secondary Airs 410 wrap 102, No. two light phase coal dusts 202, three of the light phase coal dust of No.1 on the outside
Light phase coal dust 302 and No. four light phase coal dusts 402, the i.e. Secondary Air 210, three of No.1 Secondary Air 110, two Secondary Air 310 and four
Respectively flow direction is respectively using boiler center O as the corresponding outer tangential direction of second center circle 23 in the center of circle second for number Secondary Air 410
Center circle 23 wraps the first center circle 11 on the outside, so that the Secondary Air of Secondary Air 210, three of No.1 Secondary Air 110, two
310 and No. four Secondary Airs 410 for the burning of the coal dust of inside provide combustion air, while 110, No. two Secondary Airs of No.1 Secondary Air
210, No. three Secondary Airs 310 and No. four Secondary Airs 410 mix more uniform with the coal dust in burner hearth.Simultaneously because No.1 is secondary
The Secondary Air 310 of Secondary Air 210, three of wind 110, two and No. four Secondary Airs 410 wrap coal dust, but also along the inside of boiler
The oxidizing atmosphere of the water-cooling wall of wall setting, plays the role of preventing water-cooling wall coking and corrosion.
In conclusion by the present invention in that First air carry coal dust sprayed after air-coal separating by First air nozzle 1,
So that the radially mutual centering of dense phase pulverized coal of the First air nozzle 1 in every group of opposed nozzle of First air, light phase coal dust is located at dense
The outside of phase coal dust, so that wrapping up dense phase pulverized coal in the light phase coal dust of the opposed nozzle of multilayer First air, light phase coal dust is first and empty
Gas reacts, and heat is released in burning, lights the dense phase pulverized coal that inside liquidates.The present invention is further through the opposed nozzle of multilayer Secondary Air
Nozzle opposed with multilayer First air is along the layer-by-layer interlaced arrangement of short transverse, so that the Secondary Air as combustion air wraps up First air,
So that Secondary Air is sufficiently mixed with coal dust, to realize that stablizing for boiler is burnt, the burning highly effective of boiler entirety is improved
And economy.
It is described the prefered embodiments of the present invention in detail above in conjunction with attached drawing, still, the present invention is not limited to above-mentioned realities
The detail in mode is applied, within the scope of the technical concept of the present invention, a variety of letters can be carried out to technical solution of the present invention
Monotropic type, these simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, can be combined in any appropriate way, in order to avoid unnecessary repetition, the present invention to it is various can
No further explanation will be given for the combination of energy.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (8)
1. a kind of boiler, which is characterized in that the boiler includes that the multiple groups First air of the circumferentially-spaced distribution along the boiler is opposed
Nozzle, the opposed nozzle of First air described in every group include the two First air nozzles (1) arranged in opposite directions along the radial direction of the boiler, institute
Dense phase pulverized coal and light phase coal dust can be ejected by stating First air nozzle (1)；
In the opposed nozzle of First air described in every group, the two bursts of dense phase pulverized coals ejected in opposite directions radially liquidate, and opposite
Two strands ejected the light phase coal dust is respectively formed at the outside of the dense phase pulverized coal radially to liquidate；
The opposed nozzle of First air described in multiple groups is configured to so that dense phase pulverized coal described in multiply is at the boiler center of the boiler
(O) collect and liquidate, and making the respective flow direction of light phase coal dust described in multiply be respectively with the boiler center (O) is the center of circle
The corresponding outer tangential direction of first center circle (11), the boiler include the spaced apart multilayer institute of short transverse along the boiler
The opposed nozzle of First air is stated, every layer of opposed nozzle of First air includes described in the multiple groups along the circumferentially-spaced distribution of the boiler
The opposed nozzle of First air；The boiler further includes the spaced apart opposed nozzle of multilayer Secondary Air of short transverse along the boiler,
Every layer of opposed nozzle of Secondary Air include along the opposed nozzle of Secondary Air described in two groups of the circumferentially-spaced distribution of the boiler, it is more
The layer opposed nozzle of the First air nozzle opposed with Secondary Air described in multilayer is along the layer-by-layer interlaced arrangement of short transverse, two described in every group
The secondary opposed nozzle of wind includes two overfire air jets (2) arranged in opposite directions along the radial direction of boiler, and the overfire air jet (2) includes
The overfire air jet inner cavity formed is surrounded by overfire air jet shell, which is Secondary Air main air duct (21),
And side wind channel (3) is formed in the overfire air jet shell, the side wind channel (3) is in the overfire air jet (2)
Outlet air end be connected with hollow extension pipeline section (22), the extension pipeline section (22) be parallel to the boiler inner wall stretch out to spray
Circumferential Secondary Air out, to form the circumferential brattice for protecting the inner wall of the boiler.
2. boiler according to claim 1, which is characterized in that the First air nozzle (1) includes by First air nozzle housing
Body surrounds the First air nozzle chamber formed and the bluff body (14) being arranged in the First air nozzle chamber, the bluff body (14)
The First air nozzle chamber is divided into two independences as dense phase pulverized coal channel (12) He Danxiang coal dust channel (13)
Channel, the side wall of the light phase coal dust channel (13) extends along the outside deflection of axial direction of the First air nozzle body,
The side wall of the dense phase pulverized coal channel (12) extends along the axial direction of the First air nozzle body.
3. boiler according to claim 2, which is characterized in that the light phase coal dust of every layer of opposed nozzle of First air
Deflection is arranged clockwise or counterclockwise in channel (13).
4. boiler according to claim 1, which is characterized in that the opposed nozzle of Secondary Air described in multilayer be configured to so that
The respective flow direction of the Secondary Air of Secondary Air main air duct (21) blowout is respectively second for the center of circle with the boiler center (O)
The corresponding outer tangential direction of center circle (23).
5. boiler according to claim 4, which is characterized in that the diameter of second center circle (23) is greater than described first
The diameter of center circle (11), and it is less than the diameter of the boiler.
6. boiler according to claim 1, which is characterized in that side wind channel (3) includes spraying along the Secondary Air
The transverse direction setting of mouth (2) is logical in the first side wind channel (31) of the two sides of Secondary Air main air duct (21) and second side wind
Road (32), first side wind channel (31) and second side wind channel (32) are about the overfire air jet (2)
Longitudinal center axis is arranged symmetrically.
7. boiler according to claim 1, which is characterized in that on the cross section of the overfire air jet (2), described two
The multiple Secondary Air accessory channels (24) separated with the Secondary Air main air duct (21) are also formed at the top of secondary wind nozzle (2).
8. boiler according to claim 7, which is characterized in that the overfire air jet (2) includes six auxiliary wind
Channel (24), and six auxiliary wind channels (24) be arranged as above the Secondary Air main air duct (21) two it is horizontally-arranged
With three perpendicular column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610232520.4A CN105737139B (en) | 2016-04-14 | 2016-04-14 | Boiler |
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| CN201610232520.4A CN105737139B (en) | 2016-04-14 | 2016-04-14 | Boiler |
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| CN106224949B (en) * | 2016-08-24 | 2018-04-24 | 东南大学 | A kind of non-coaxial horizontal bias low NOx DC coal burner |
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| JP3354755B2 (en) * | 1995-08-03 | 2002-12-09 | 三菱重工業株式会社 | Pulverized fuel combustion device |
| CN1091501C (en) * | 1996-11-09 | 2002-09-25 | 哈尔滨工业大学 | Blast changeable coal burning method and equipment |
| CN201212676Y (en) * | 2008-06-17 | 2009-03-25 | 哈尔滨工业大学 | Horizontal bias DC combustion apparatus of wall arrangement |
| CN103090368B (en) * | 2013-02-20 | 2016-05-04 | 上海锅炉厂有限公司 | The anistree DC burner coal powder light-dark of two fireballs apart arrangement mode |
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Address after: 100011 Beijing Dongcheng District, West Binhe Road, No. 22 Applicant after: National energy investment Refco Group Ltd Applicant after: Shenhua Guoneng Energy Group Corporation Limited Applicant after: STATE GRID ENERGY FUKANG POWER GENERATING CO., LTD. Address before: 100011 Beijing, Dongcheng District Anwai Binhe West Road No. 22 Shenhua building Applicant before: Shenhua Group LLC Applicant before: Shenhua Guoneng Energy Group Corporation Limited Applicant before: STATE GRID ENERGY FUKANG POWER GENERATING CO., LTD. |
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