CN207196470U - Fired power generating unit tangentially firing boiler and its combustion system suitable for Ultra-low load operation - Google Patents
Fired power generating unit tangentially firing boiler and its combustion system suitable for Ultra-low load operation Download PDFInfo
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- CN207196470U CN207196470U CN201721237176.4U CN201721237176U CN207196470U CN 207196470 U CN207196470 U CN 207196470U CN 201721237176 U CN201721237176 U CN 201721237176U CN 207196470 U CN207196470 U CN 207196470U
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Abstract
It the utility model is related to a kind of fired power generating unit tangentially firing boiler and its combustion system suitable for Ultra-low load operation, the combustion system is single flow pulverized coal combustion system, and including multiple burner groups, each burner group includes the high-order coal burner as wind combustor of the superiors in main burning area and a number of other wind combustors being arranged in main burning area, wherein, the high-order coal burner is configured to two-layer high position fuel-staged combustion device and/or a multiple other wind combustor is configured to vertical strong/weak coal burner.Fired power generating unit tangentially firing boiler of the present utility model includes above-mentioned combustion system and pulverized coal preparation system, and the pulverized coal preparation system includes the coal pulverizer with sound combination rotary separator.Compared with prior art, the utility model can ensure the underload flexibility service ability of coal-burning boiler, and for example can ensure that large sized unit boiler in the stable operation of ultra-low load without any auxiliary under the conditions of combustion-supporting.
Description
Technical field
The Optimizing Reconstruction design that boiler at low load is flexibly run is the utility model is related to, more particularly, to suitable for ultra-low load
The fired power generating unit tangentially firing boiler and its combustion system of operation.
Background technology
At present, as the increase of net capacity and the change of power structure, power network peak load difference gradually increase, exchanged
The demand of peak power supply also gradually rises.Large sized unit is increasing in the ratio that each bulk power grid in China occupies, thus Large Copacity
Unit participates in peaking operation into inexorable trend.Therefore, improve the flexible service ability of fired power generating unit, allowed for domestic clean energy resource
Road and on the premise of power grid operation is ensured, any " auxiliary helps an urgent demand fired power generating unit coal-burning boiler not using
Combustion " under conditions of and for example unit have less than or equal to 25% rated load when can stable operation, to improve power plant
The stability and flexibility that boiler puts into operation, and it is possible thereby to realize depth peak regulation (Ultra-low load operation), rapid starting/stopping, climb
Ability is strengthened, and can realize the random decoupling parallel of thermoelectricity for thermoelectricity unit.Therefore, thermal power plant coal unit is " super
Underload stable operation " retrofit work is imperative.
Utility model content
On the basis of above-mentioned background, the purpose of this utility model is to propose a kind of fire suitable for Ultra-low load operation
The combustion system used in group of motors tangentially firing boiler, efficient, stable when it can ensure the burning of boiler ultra-low load and
Low-nitrogen oxide discharging and flexibility combustion adjustment.
Another purpose of the present utility model is to propose a kind of fired power generating unit tangential firing suitable for Ultra-low load operation
Boiler, it can improve the underload flexibility combustion adjustment of coal-burning boiler, and for example can ensure that large sized unit boiler in nothing
The stable operation of ultra-low load under the conditions of any auxiliary is combustion-supporting.
Therefore, according to one side of the present utility model, a kind of combustion system is proposed, it is suitable for Ultra-low load operation
Being used in fired power generating unit tangentially firing boiler, the combustion system is single flow pulverized coal combustion system, and including multiple burners
Group, each burner group is including the high-order coal burner as wind combustor of the superiors in main burning area and is arranged on
A number of other wind combustors in main burning area, wherein, the high-order coal burner is configured to the high-order combustion of two-layer
Material gradual combustor and/or a multiple other wind combustor are configured to vertical strong/weak coal burner.
Advantageously, the multiple burner group be arranged with corner, direct current tangential combustion configuration four burning
Device group.
Advantageously, the pulverized coal channel of the porch of the two-layer high position fuel-staged combustion device is classified provided with coal dust
Converter, the Pulverized Coal for entering the two-layer high position fuel-staged combustion device is divided into pure dense pure light two-stage and divided
Layer burning, multiple bluff bodies are provided with the nozzle of the two-layer high position fuel-staged combustion device；And/or in the vertical strong/weak
Baffle-type pulverized coal concentrator is provided with a wind pipe of coal burner, and in the spout of the vertical strong/weak coal burner
It is interior to be provided with horizontally disposed shunting bluff body, to cause the Pulverized Coal into the vertical strong/weak coal burner to form two strands
Dense, thin powdered coal air-flow, and multiple vertical strong/weak coal burners are arranged in a manner of " with mutually adjacent affine stable burning ", i.e., it is more
Arrange to the adjacent ports " same to concentrated phase " of individual vertical strong/weak coal burner or " with light phase ".
Advantageously, the back-fire side in the vertical strong/weak coal burner is provided with (such as rigidity is strong) biasing circumference
Wind snout.
Advantageously, each burner group also includes with one or more of lower member：
The high-order separation after-flame wind system that the classification of multilayer (such as four layers or more layers) formula is sent into, it is located at main burning area
Top simultaneously keeps certain distance with the main burning area, wherein each fire air nozzle difference of the high-order separation after-flame wind system
Using independent blowing system, and it is configured to vertically carry out bidirectional swinging with horizontal direction respectively；
The secondary wind combustor of biasing being arranged in main burning area, wherein the spout direction of the secondary wind combustor of biasing
Back-fire side biases (such as 3-5 °)；
The adherent wind combustor in top being arranged in main burning area, it is located at the two-layer high position fuel-staged combustion device
Top, and spray Secondary Air from the spout both sides of the adherent wind combustor in the top；
Vertical strong/weak tiny-oil ignition or plasma pulverized coal ignition burner, it is set as the orlop burner in main burning area
In main burning area, wherein pulverized coal concentrator is provided with the vertical strong/weak tiny-oil ignition or plasma pulverized coal ignition burner, with
The coal dust for making to enter the vertical strong/weak tiny-oil ignition or plasma pulverized coal ignition burner forms two strands of dense, thin powdered coal air-flows, and
The vertical strong/weak tiny-oil ignition or plasma pulverized coal ignition burner are with adjacent vertical strong/weak coal burner with " dense affine "
Mode arrange.
According to another aspect of the present utility model, a kind of fired power generating unit tangential firing pot suitable for Ultra-low load operation is proposed
Stove, it includes foregoing combustion system and pulverized coal preparation system, wherein the pulverized coal preparation system includes having sound combination rotation point
From the coal pulverizer of device.
Advantageously, the pulverized coal preparation system is the positive pressure direct for example equipped with medium-speed pulverizer or double-inlet and double-outlet steel ball coal mill
Blow formula pulverized coal preparation system, the sound combination rotary separator include driver, reductor, coal dust classification converter, rotor blade,
Stator blade and time powder cone, the driver are connected with the reductor by shaft coupling, and the rotor blade is connected to described
In the hollow shaft of sound combination rotary separator, the stator blade be arranged on the housing of sound combination rotary separator with
Between the rotor blade.
Advantageously, the stator blade is configured to have adjustable setting angle.
Advantageously, the coal pulverizer has entrance Split assembled rotary spray nozzle ring, the entrance Split assembled rotation spray
Mouth ring includes rotating ring, stationary ring, millstone sheet and mill, and the rotating ring is bolted with the mill, and the stationary ring is fixed on
On the barrel of coal pulverizer.
Advantageously, the coal pulverizer carries out being layered coal pulverizer list mill fortune when pulverized coal preparation system reaches one mill service condition
Go and can be worked in a manner of double mills or more mill is run simultaneously.
Fired power generating unit tangentially firing boiler and its combustion system of the present utility model suitable for Ultra-low load operation is existing
Transformation forms on the basis of fired power generating unit coal-burning boiler, and compared with prior art, boiler reforming technology master of the present utility model
It is related to Retrofit of Combustion System (ultralow nitrogen or low load combustion device transformation) and milling system optimized transformation (microfine coal preparation
Transformation or coal pulverizer transformation), both cooperate and complemented each other.Particularly, the utility model uses present inventor
" the high-order combustion-system fuel fractional combustion " proposed first and " vertical strong/weak coal dust firing is with mutually adjacent affine stable burning "
Etc. technology, it is ensured that efficient, the stable and low-nitrogen oxide discharging to be burnt during boiler Ultra-low load operation.
In other words, compared with prior art, the utility model can improve the underload flexibility operation of coal-burning boiler
Ability, realize large sized unit boiler " without it is micro- oil, without plasma, without gas, without oxygen-enriched " etc. it is any auxiliary it is combustion-supporting under the conditions of surpass
Underload stable operation, the flexible running optimizatin improvement and design of underload are flexibly adjusted for guarantee unit boiler under the conditions of ultra-low load
Whole, stable operation provides the advanced technology guarantee of combustion system.
Particularly, good effect of the present utility model is, pulverizer capacity increase, fineness of pulverized coal improves (coal dust change
Carefully), pulverized coal fineness index improves；After coal pulverizer Optimizing Reconstruction output scope expand, and enable to boiler " without it is micro- oil,
Without plasma, without gas, without oxygen-enriched " etc. it is any auxiliary it is combustion-supporting under conditions of realize unit in the rated load less than or equal to 25%
Under stable operation；The ultralow discharged nitrous oxides of boiler, property indices do not reduce after transformation；Ensure that coal dust efficiently fires
Burn, not slagging in stove, without high temperature corrosion, there is broad ature of coal adaptability；Realize boiler ultra-low load, efficiently, stably, it is economical
Property operation.
Brief description of the drawings
In order to be more clearly understood that the above and further feature and advantage of the present utility model, with reference to the accompanying drawings and combine
The utility model is described in more detail preferred embodiment, wherein：
Figure 1A is a kind of front view of each layer burner in single angle of existing fired power generating unit tangential boiler, and it schematically shows
The structure configuration of each spout of the combustion system (burner group) at each angle before transformation；
Figure 1B is each layer in single angle according to the improved fired power generating unit tangentially firing boiler of an embodiment of the present utility model
The front view of burner, that schematically shows the combustion system (burner group) at the improved each angle of the utility model
Each spout structure configuration；
Fig. 2 is the structural representation of the sound combination rotary separator in the coal pulverizer according to pulverized coal preparation system of the present utility model
Figure；
Fig. 3 schematically illustrates the total assembling structure of coal pulverizer provided with sound of the present utility model combination rotary separator；
Fig. 4 schematically illustrates the combination nozzle ring structure after optimizing according to the utility model.
Embodiment
Preferred embodiment of the present utility model is described by way of example below in conjunction with the accompanying drawings.It is noted that for convenience of figure
Show and readily appreciate, the sizes of the associated components in each accompanying drawing of the present utility model, position etc. be not strictly drawn to scale.
According to the one exemplary embodiment of the present utility model, a kind of fired power generating unit tangentially firing boiler is proposed, it is suitable to super
Underrun, and formed mainly for existing known fired power generating unit tangentially firing boiler transformation, the boiler includes powder processed
System and combustion system, the pulverized coal preparation system are, for example, the malleation blow-through equipped with medium-speed pulverizer or double-inlet and double-outlet steel ball coal mill
Formula pulverized coal preparation system, the combustion system are, for example, single flow pulverized coal combustion system, and the combustion system is included with polygonal (such as four
Angle) arrange, multiple burner groups of the configuration of direct current tangential combustion.
Each major part of the fired power generating unit tangentially firing boiler of the embodiment of the present utility model described in detail below
Structure design and its main improvements relative to prior art.
Ultra-low load burner reconstruction technology (ultra-low load combustion system)
Figure 1A is a kind of front view of each layer burner in single angle of existing fired power generating unit tangentially firing boiler, and it is schematically
Show the structure configuration of each spout of the combustion system (burner group) at each angle before transformation；Figure 1B is according to this practicality
The front view of each layer burner in single angle of the improved fired power generating unit tangentially firing boiler of the new embodiment, it is schematically
Illustrate the structure configuration of each spout of the combustion system (burner group) at the improved each angle of the utility model.
The combustion system at each angle of the existing fired power generating unit tangentially firing boiler before transformation is can be seen that from Figure 1A
Vertically include upper area and lower area (main burning area).The upper area includes original after-flame wind system 1, institute
Stating lower area includes original tiny-oil ignition or plasma pulverized coal ignition burner 4, an original wind combustor 5, the combustion of original Secondary Air
Burner 3 and original secondary wind combustor 2 in top.Original tiny-oil ignition or plasma pulverized coal ignition burner 4 are located at the lower region
The bottom in domain, original secondary wind combustor 2 in top are located at the top of the lower area.Original First air burning
Device 5 is located substantially on the middle part of the lower area, and quantity is four, i.e. from the bottom up vertically, it includes successively
Wind combustor of first layer, wind combustor of the second layer, wind combustor of third layer and the 4th layer of wind combustor.
The quantity of original secondary wind combustor 3 is two, i.e. positioned at the tiny-oil ignition or plasma pulverized coal ignition burner 4 and institute
State the secondary wind combustor of first layer between wind combustor of first layer and positioned at described wind combustor of third layer and institute
State the secondary wind combustor of the second layer between the 4th layer of wind combustor.
In contrast, transported according to the embodiment, the utility model for fired power generating unit tangentially firing boiler ultra-low load
Row is required to reduce NOx, improved the characteristics of ultra-low load steady combustion ability and efficient burning, and development and design is using " high position burning system
System fuel-staged combustion " changes with technologies such as " vertical strong/weak coal dust firing are with mutually adjacent affine stable burning " to combustion system
Make, its major alterations content includes：
High-order coal burner as wind combustor of the superiors of main burning area (lower area) uses high-order coal
Powder gradual combustor, it carries out fuel staging to the coal burner at the top of boiler main burner region, by being set on pulverized coal channel
Coal dust classification converter Pulverized Coal is divided into two-stage (" concentrated phase " and " light phase "), hearth combustion is sprayed into after nozzle, spray
Multiple bluff bodies (more bluff body structures) are provided with mouthful, returning for multiple stabilizations will be produced when First air coal dust intermixture jet passes through bluff body
Area is flowed, so that ignition heat reduces, stabilization of catching fire.Simultaneously as at burner outlet bluff body presence, postponed Secondary Air
Mixing, increase residence time of the flue gas in fugitive constituent combustion zone, that is, add the reduction reaction time, make more to fire
Material N is reduced into N2, local hierarchical burning is formed about in burner outlet, NOx growing amount can also be reduced.Nozzle body can be adopted
With lined ceramicses structure.Particularly, the utility model (utilizes the coal dust point at burner inlet using grading design transformation
Pulverized Coal is divided into pure dense pure light two-stage by level conversion device), and coal powder distribation ratio and deep or light ratio can be rationally designed, so as to protect
Demonstrate,prove coal dust efficiently, stably, low nitrogen burning, and contribute to the ultra-low load of fired power generating unit tangentially firing boiler flexibly to run.
In addition, according to the embodiment, other wind combustors in main burning area use vertical strong/weak coal burner, its
The vertical staged burning of air and dense-dilute burner combustion technology are combined.Dense-dilute burner combustion technology is to be used in a wind pipe by detailed
It is thin to study and the baffle-type pulverized coal concentrator of optimization, breeze airflow is produced different degrees of deflection when flowing through baffle plate, coal dust and
Flow inertance separates, and forms two strands of dense, thin powdered coal air-flows respectively after shunting bluff body, while can be in the back-fire side of coal burner
The strong bias-signal-modulated noise spout of arrangement rigidity.Breeze airflow is formed about the oxidisability more much better than than ordinary burner in water-cooling wall
Atmosphere.The oxidizing atmosphere that bias-signal-modulated noise is formed further reinforcing coal dust in the input of back-fire side, ensures in depth boiler
Under internal classification combustion system, the running environment of low pulverized coal particle concentration and oxidizing atmosphere near water-cooling wall.This arrangement side
Formula not only acts as steady combustion and reduces the effect of NOx generations, while also avoids the formation of reducing atmosphere, prevents water wall high temperature corrosion
Phenomenon occurs.
In addition, the utility model can combine vertical strong/weak tiny-oil ignition or plasma pulverized coal ignition burner uses vertical strong/weak coal
Powder burning is the same as mutually adjacent affine stable fuel design：That is, orlop little oil burner " under light dense ", first layer First air
Burner " under dense light "；Wind combustor of the second layer " under light dense "；Wind combustor of third layer " under dense light "；The
Four layers of wind combustor, which are graded, transform two-layer high position fuel-staged combustion device " under dense light " as；A main wind combustor
Adjacent ports " same to concentrated phase " or " with light phase " design arrangement, overall to keep equivalent arrangements, thermal capacity unit is relatively independent, mutually
Burning is supported, stable burning, the purpose for reducing NOx emission can be played.
More specifically, as shown in Figure 1B, according to the embodiment, the improvement of ultra-low load combustion system of the present utility model
Part mainly includes：
(1) described wind combustor of first layer, wind combustor of the second layer and third layer First air combustion
Burner is improved to vertical strong/weak coal burner 11, wherein, by the original wind combustor 5 in Figure 1A and Figure 1B
Vertical strong/weak coal burner 11 contrast using in the original wind combustor 5 that can be seen that in Figure 1A and is arranged vertically
Bluff body, it is Horizontal burner, and the vertical strong/weak coal burner 11 in Figure 1B uses horizontally disposed bluff body, and it is
Coal dust is divided into deep or light two strands by vertical bias combustion device, vertical strong/weak coal burner 11 by pulverized coal concentrator, dense side coal dust
Air-flow catches fire rapidly, is to consume a large amount of oxygen other air-flows mix preceding with around, combustion atmosphere is in hypoxemia shape rapidly
State, NOx generations can be suppressed to a certain extent；It is rapid additionally, due to catching fire so that degree of pyrolysis is deepened, more fuel N with
Fugitive constituent together discharges, and char N is greatly decreased, and under low NOx combustion state fugitive constituent N to NOx conversion ratio than char N
It is much lower to NOx conversion ratio.Light side coal powder density is relatively low, and initiation combustion temperature of catching fire is relatively low, and NOx discharges are also can be controlled in
Reduced levels.The vertical strong/weak coal burner 11 in Figure 1B can be equipped with bias-signal-modulated noise simultaneously, to improve near water-cooling wall
Oxygen amount, increase its oxidizing atmosphere, be better protected from coking, prevent high temperature corrosion.
Advantageously, it is provided with the spout outlet of above-mentioned each wind combustor of the present utility model single or multiple blunt
Body.Preferably, multiple horizontally disposed bluff bodies are installed in burner nozzle (in coal nozzle), is gone out with improving First air nozzle
Coal powder density at mouthful, and stable recirculating zone is formed in front of more bluff bodies, volume inhales high-temperature flue gas so that coal dust contacts with oxygen to be filled
Point, control flame recirculating zone, flameholding, boiler efficiency, while combustion flame " interior dense outer light " can be improved, flame periphery is filled
Full reductant, advantageously reduces boiler discharged nitrous oxides.
By the above-mentioned means, the utility model uses advanced vertical super bias coal combustion technology, and it is more to combine spout
Bluff body overheavy firing measure, so as to effectively reduce emission of NOx of boiler amount, strengthen the combustion stability of colm, ensure high
Effect burning, and fuel tolerance is widened, prevent boiler scaling and high temperature corrosion；
(2) described 4th layer of wind combustor, which is graded, transform two layers of high-order fuel-staged combustion device 8 as, wherein profit
Converter is classified with coal dust, the coal dust classification converter connects with pulverized coal channel.According to the embodiment, using specific coal dust
Classification converter design can by Action of Gravity Field by the coal dust of a 4th layer of wind combustor in Figure 1A be divided into two strands it is pure dense, pure
Light coal powder is respectively fed in two layers of burner nozzle of the high-order fuel-staged combustion device 8 in Figure 1B, so that by top all the way
Pulverized Coal carries out fuel staging and is divided into pure dense, pure light two-way.In addition, nozzle can use more bluff body structures, primary wind and powder
The recirculating zone of multiple stabilizations will be produced when mixture jet passes through bluff body, so as to reduce ignition heat, ensure efficient coal dust, low nitrogen,
Stable burning.
As can be seen here, it is divided into two layers by above-mentioned measure, one layer of described 4th layer of (the superiors) wind combustor,
It is while ensureing reducing emission of NOx of boiler amount, it is ensured that boiler coal-ash is burnt, combustion stability is good, is avoided in stove
Or slow down slagging and high temperature corrosion, boiler efficiency is improved, and there is extensive ature of coal adaptability.
In addition, as can be seen that also preferably being used according to the embodiment, combustion system of the present utility model from Figure 1B
It is one or more in following corrective measure：
(3) original after-flame wind system 1 is improved to the high-order separation after-flame wind system 6 that classification is sent into.For example, can will be original
Spout, wind box duct and corresponding accessory in three layers of after-flame wind system 1 are all removed, and new four layers of (or more layers) formula of design are high
Position separation after-flame wind system, to increase burnout degree air quantity, it is ensured that coal dust passes through in primary zone anoxycausis, a large amount of NOx of generation
It is reduced behind reducing zone, early stage, uncombusted coal dust passed through after-flame after burning-out zone.The burnout degree spray of after-flame wind system after improvement
Mouth vertically can carry out bidirectional swinging with horizontal direction respectively.For example, it can be passed through by design level and vertical links
Mechanical movement makes fire air nozzle realize vertical oscillation in ± 20 °, horizontal hunting in ± 15 °, and using high-order separation burnout degree
The independent blowing system of system, so as to effectively control steam temperature and its deviation；
(4) original two layers two times wind combustors are modified into biasing (having offset design) secondary wind combustor 9, wherein
As shown in Figure 1B, the spout of secondary wind combustor 9 for example can bias 3-5 ° towards back-fire side；
(5) the secondary wind combustor 2 in original top is modified into the adherent wind combustor 7 in top, wherein as shown in Figure 1B, it is adherent
Wind combustor 7 is designed to turnup structure, and Secondary Air is sprayed by spout both sides, and centre is blocked with blind plate, so as to add both sides
Water-cooling wall wall oxygen amount, reduce high temperature corrosion and coking tendency；
(6) original tiny-oil ignition or plasma pulverized coal ignition burner 4 are improved to vertical strong/weak tiny-oil ignition or plasma point
Ignition combustor 10, wherein, vertical strong/weak tiny-oil ignition or plasma pulverized coal ignition burner 10 use pulverized coal concentrator, make coal dust shape
Into two strands of dense, thin powdered coal air-flows, and formed with an adjacent wind combustor dense affine, be advantageous to drop nitrogen and flameholding.
In this case, micro- oil or plasma ignition system can all carry out uses that reuse, i.e., micro- oily or plasma pulverized coal ignition burner with it is micro-
Oil system interface is unchanged, simply adds pulverized coal concentrator on the burner, realizes the air-coal separating of coal dust, do not influence it is micro- oil or
The use of plasma ignition system, so as to while low NOx drainage is ensured, save great amount of fuel oil, meet wanting for energy-conserving and environment-protective
Ask.
According to above-described embodiment of the present utility model, by above-mentioned many corrective measures, the utility model can be to greatest extent
Ground ensures boiler while NOx is reduced, guarantee after-flame and flameholding when for example below 25% rated load, carries to greatest extent
High reheater steam temperature, avoid or slow down pot ash erosion and high temperature corrosion, improve boiler efficiency.
Particularly, the utility model disclosure satisfy that and ature of coal is become while excellent overall boiler runnability is obtained
Change the steady combustion of the larger fire coal of scope and the requirement of efficient burning, accomplish that energy-conservation and emission reduction develop simultaneously, harvest is more while once transformation
Item achievement.
It is noted that in fig. ib, H represents the center line of after-flame wind system and the center of high-order pulverized coal staging combustion device
The distance between line, it can be drawn by designing to calculate with sunykatuib analysis and incorporation engineering case experience.
The principle that the ultra-low load combustion system of above-described embodiment of the present utility model can combine Researched of Air Staging Combustion Burning Pulverized Coal is entered
Exercise and use, its general principle is：Air capacity needed for burning is divided into two-stage and is sent into burner hearth, makes excess air system in main burning area
Number is 0.8-1, and fuel first burns under fuel-rich conditions so that burning velocity and temperature reduce, and delayed combustion process, are reducing
Property atmosphere in a large amount of nitrogen-containing groups reacted with NOx, so as to improve NOx to N2Conversion ratio, reduce NOx in this region
Growing amount.Remaining air needed for burning is sent into burner hearth by being arranged in the fire air nozzle (OFA) above main burner,
After feeding burnout degree, turn into oxygen-enriched combusting area.Now though air capacity is more, because flame temperature is low, and the big portion separated out in coal
Nitrogen-containing group is divided to react completion in primary zone, final NOx generation amount is little, while the infeed of air makes residue in pulverized coal particle
The abundant after-flame of coke, ensures the high burning efficiency of coal dust, and vertical air fractional combustion can make NOx generation amount reduce by 40 in final stove
~45%.Using depth Researched of Air Staging Combustion Burning Pulverized Coal when, due to more much smaller than 1 in main burning area excess air coefficient, burning be
Carried out than theoretical air requirement in the case of much lower, although being advantageous to suppress NOx generation, produce a large amount of imperfect combustions
Product, cause efficiency of combustion to reduce and easily cause slagging and heated surface corrosion.Therefore, it is necessary to correctly organize rational air point
Level burning, ensureing to reduce NOx emission while taking into full account the economy and security reliability of boiler operatiopn.
Microfine coal pulverizing system transformation technology (coal pulverizer with sound combination rotary separator)
, it is known that the coal pulverizer (such as medium-speed pulverizer) of existing pulverized coal preparation system generally includes static separation device, the static state
Separator works essentially according in the following manner：Separator top is circumferentially evenly distributed with multiple deflector baffles, primary mixture stream
Change flow direction through baffle plate and produce rotation, coarse powder realizes separation under centrifugal force and Action of Gravity Field, and the coarse powder isolated falls after rise
Milled again to mill room.
Applicant have observed that it is larger using coal dust regulation difficulty caused by the coal pulverizer of existing static separation device, and exist
The defects of " effective quick regulation fineness of pulverized coal can not be changed according to ature of coal moisture, be unfavorable for evenly distributing for coal dust ".
To overcome drawbacks described above, the utility model proposes a kind of improved sound combination rotary separator, wherein Fig. 2
It is the structural representation of the sound combination rotary separator in the coal pulverizer according to pulverized coal preparation system of the present utility model, Fig. 3 illustrates
Property illustrate provided with sound of the present utility model combination rotary separator the total assembling structure of coal pulverizer.
As shown in Fig. 2 sound combination rotary separator of the present utility model includes driver (such as variable-frequency motor) 21, subtracted
Fast machine 22, coal dust classification converter (pulverized coal distributor) 23, rotor blade 24, stator blade 25 and time powder cone 26, wherein, driving
Device is connected with reductor by shaft coupling, and rotor blade is connected in the hollow shaft of separator, and stator blade circumferentially exists
Between the housing and rotor blade of separator, while stator blade can be adjusted on the spot.
The design principle of above-mentioned sound combination rotary separator is：Coal dust can be made in Gravity Separation, shock separation, be folded to
Inertial separation and centrifugal force are forced under the effect such as separation, and circulating ratio declines in mill, and flowing resistance does not increase, and reaches raising coal
Powder fineness and uniformity index, raising boiler combustion efficiency is finally reached, reduces boiler fly ash, the purpose of big slag phosphorus content.
As shown in figure 3, coal pulverizer of the present utility model mainly includes sound combination rotary separator 31, loading frame 32, drawn
Bar 33, nozzle ring 34 and hydraulic cylinder 35, wherein, the part of milling of coal pulverizer can be made up of the mill rotated and three grinding rollers, be needed
The raw coal milled is fallen on mill from coal pulverizer center coal spout, and the mill of rotation, which is moved to raw coal by means of centrifugal force, mills
On raceway, milled by grinding roller, grinding forces are then produced by hydraulic loading system, will be ground by hydraulic cylinder, loading frame, pull bar
Power stepless action is ground on three grinding rollers.Raw coal mill and dry at the same carry out, First air is by nozzle ring even into mill
It will be dried around disk by the coal dust intermixture tangentially thrown away from mill of milling and be delivered to the sound combination on coal pulverizer top
Rotary separator is separated, coarse powder be separated return mill milled again, qualified coal dust is taken out of by First air
Separator.
In sound of the present utility model combines rotary separator, transmission system is the critical component of whole separator.For
This, in the utility model, using reductor, via bearing block, (reductor is connected turntable bearing, turntable bearing connection with impeller
Hollow shaft, hollow shaft is in connection rotor blade) it is connected, its is simple in construction, reliable.
In addition, in the utility model, the setting angle of stator blade 5 is adjustable, wherein, the top connection length of stator blade
Axle and short axle, short axle are exposed to separator top cover position, and the angle of stator blade passes through the short axle exposed at separator top cover
Regulation.Furthermore it is advantageous that installing humanoid hole on Membrane Separator Cylinder for CFB Boiler additional, stator blade corresponding with humanoid hole is designed as detachably
Formula, easy access.In addition, after designing the angle (optimization angle) of stator blade, only leaf need to be adjusted for example, by variable-frequency motor
The rotating speed of wheel, easily fineness of pulverized coal can effectively be adjusted with as needed.
In addition, according to the utility model, due to using stator blade and the mover leaf of adjustable rotating speed with optimization angle
Piece, whole dynamic and static system form double-deck cage construction so that coal dust adds by rotor blade again after stator blade separates
Speed separation, separative efficiency is apparently higher than existing static separation device.Moreover, the utility model can use long and narrow adjustable stator blade
And rotor blade, long and narrow blade type damper make it that pulverized coal flow uniformity on passage section is more preferable.Along with static structure with
Dynamic structure is mutually completely independent, and when motion transmission system occurs surprisingly run, the separator still disclosure satisfy that
Boiler operatiopn requirement, thus operational reliability significantly improves for pulverized coal preparation system.
Moreover above-mentioned sound combination rotary separator (rotor blade and stator blade) of the present utility model can use and surpass
Wear-resisting " metal+ceramics " Precautionary Measure, whole separator use very easy, reliable with little need for regular maintenance.
More specifically, after combining rotary separator using sound of the present utility model, the coal pulverizer is according to lower section
Formula works：
When breeze airflow is entered the separator cavity of high-order arrangement by coal-grinding machine drum body, because sectional area increases suddenly, stream
Prompt drop is low, and the big part of coal powder particles of quality lose kinetic energy, is slipped into by Action of Gravity Field along Outer Taper inwall in back powder pipe.Dividing
From multiple uniform, adjustable angle stator blades (baffle plate) are equipped with the top of device, when wind coal mixtures pass through stator blade, by leaf
Piece stops to form the vortex of wind coal mixtures, and the centrifugal force as caused by vortex changes direction and the speed of pulverized coal particle, so as to promote
Make bulky grain coal dust leave breeze airflow to fall in inner cone, entering back powder pipe and raw coal along inner cone inwall is mixed feeding
Coal pulverizer.The aperture of adjustment stator blade (baffle plate) can change the flow field regulation of wind coal mixtures, be typically considered to static pre-
Choosing, powder fineness so as to change.
Breeze airflow into the region between stator blade and rotor blade runs at high speed band in impeller (rotor blade)
Under dynamic, pulverized coal particle is raised speed by moment, and coarse granule coal dust departs under centrifugal force and dynamic blade effect of impact with breeze airflow
Into inner cone bottom, back powder pipe is subsequently entered.Satisfactory coal dust is through dynamic impeller (blade) through separator outlet
Into boiler.
It will thus be seen that under the same conditions, wheel speed is big, then centrifugal force is big, when coarse granule coal dust be subject to from
When mental and physical efforts are more than the traction of air-flow, just come out by natural separation.Pulverized coal particle is smaller, and it is bigger to separate required centrifugal force, institute
The wheel speed needed is also higher.When movable vane rotating speed is higher, higher fineness of pulverized coal can be obtained.Therefore, reduction can be passed through
Or improve wheel speed and realize the fineness of pulverized coal requirement subscribed.
It can be seen that dynamic impeller can also produce sizable perturbed force when rotated, make from above-mentioned separator operation logic
Coal dust promotes wind powder mixture more to become to homogenizing when being raised speed by moment, thick, fine breeze is disturbed reduction each other, so as to reduce
The qualified coal dust quantity returned in powder, reduces the circulating ratio of separator, and improve the uniformity of coal dust.Separator circulation
Multiplying power reduces the specific energy consumption for going out powder efficiency, reducing coal pulverizer for actually also improving coal pulverizer.Due to pulverized coal fineness
Improve, coal powder density deviation substantially reduces between outlet, and this plays critically important effect to boiler combustion control.Certainly, coal dust
The size of centrifugal force that grain is subject to and the angle of static vane (stator blade) and the rotary speed of dynamic impeller (mover blade)
There is relation, only when the two ties in, just fineness of pulverized coal, uniformity can be made to reach optimum state.Otherwise, effect will carry on the back
Road and speed.
Its high reliability is using another advantage of sound combination trap, rotor fault still can realize choosing when stalling
Powder function, influence of the various failures to system is considered during design, ensure that static vane is to adjust under normal operating conditions
, when rotor-support-foundation system failure stalls, powder effect can be preferably selected by adjusting the acquirement of static vane angle, ensure boiler safety
Operation.For pure static or pure dynamic separator, the reliability of sound combination trap is considerably higher.
From the above, it can be seen that the design concept of sound of the present utility model combination rotary separator be based primarily upon and
Come from medium-speed pulverizer static separation device, the static separation device is structurally characterized in that：Fineness of pulverized coal improves, then coal pulverizer goes out
Power declines, and output drop rate is far longer than fineness increase rate.Caused by this is primarily due to the structure of static vane.In addition,
The multiple exit distributor of the static separation device, which can not play, efficiently separates thick, fine powder effect.Based on background above, this Shen
Inventor please has found, can be with the basis of original static separation if substituting multiple exit distributor using dynamic impeller
Increase the function of a Dynamic Separation, thus qualified coal dust can be discharged by quickly separation, so as to effectively reduce separator
Caused recycling coal dust.Further, since dynamic separator can realize that wheel speed is adjusted, coal dust can be made in gravity point
From, hit separation, be folded in the presence of inertial separation and centrifugal force forces separation etc., circulating ratio declines in coal pulverizer, leads to
Wind resistance does not increase, and so as to significantly improve fineness of pulverized coal and uniformity index, and is finally reached and improves boiler combustion efficiency, reduces
The purpose of flying dust, big slag phosphorus content.
As can be seen here, fineness of pulverized coal is to the obvious effect of ignition temperature, the heat rolled into a ball for coal dust cloud cluster, its little particle
Capacity is small, can be heated rapidly to ignition temperature.Meanwhile ignition temperature is reduced as quality of pc concentration improves, so
Under the conditions of the identical output of coal pulverizer, the appropriate air quantity that reduces can also promote the solution of boiler low load stable combustion problem.More than being based on
Understanding or background, using after the coal pulverizer that rotary separator is combined with sound, it is ensured that coal dust deviation, it is thin to improve coal dust
Degree, uniformity, fineness of pulverized coal improve, and burnout rate improves, and burning is abundant, reduce flying dust, big slag phosphorus content, it is possible to implement depth point
Level, reduce NOx discharge；Meanwhile fineness of pulverized coal is high, specific surface area is big, and coal dust burns that speed is fast, and carbon is surface reaction, easily
Contacted with oxygen, so as to substantially reduce boiler NOx gas discharge capacitys.
In other words, compared with prior art, after using the sound combination rotary separator transformed according to the utility model,
Fineness of pulverized coal and pulverized coal fineness will be guaranteed, and dynamic can in the range of certain fineness to fineness of pulverized coal for dynamic separator
Adjust, pulverized coal fineness is high；In addition, isolation resistance does not increase, the output of existing pulverized coal preparation system is not reduced, in same ature of coal, together
In the case of sample fineness of pulverized coal, pulverizer capacity increases before relatively transforming after transformation.
Particularly, the combustion system after above-mentioned improvement of the present utility model with after improvement there is sound to combine rotating separation
The coal pulverizer of device, which combines, will can give play to each optimal function and obtain optimal technique effect.
Advantageously, the utility model can be combined with using following renovation technique：
Using coal pulverizer inlet Split assembled rotary spray nozzle ring
As shown in figure 4, following structure is had according to coal pulverizer inlet Split assembled rotary spray nozzle ring of the present utility model：Its
Including rotating ring 41, stationary ring 42, millstone sheet 43 and mill 44, wherein, rotating ring is bolted with mill, and stationary ring is welded on coal-grinding
On the barrel of machine.
The operation principle of the nozzle ring is as follows：First air by nozzle ring even into bull ring around, will through milling
The coal dust intermixture tangentially thrown away from bull ring is dried and is delivered to the separator on coal pulverizer top, is divided in the separator
It is separated from, coarse powder and returns to mill and reface, qualified fine powder takes separator out of by heat primary air.It is difficult to crush and First air
The heavier pebble coal that can not blow, iron block etc. fall on an air compartment by vane, and dreg discharging box is blown into by scraper plate.
After combination nozzle ring of the present utility model, it can for example reach following beneficial effect：Coal-grinding can be reduced
The current of electric of machine, the drying capacity of coal is strengthened, and eliminates the friction between the sound part in the original design of prior art；Can
Make to form coal bed evenly above mill by the unique design of ring blade, directive wheel (label 45 is rotating ring blade), accelerate
The drying of coal dust；The coal pulverizer response time accelerates, and due to coal bed support evenly, can improve a hot air circulation mixing, mill
The operation of coal machine is more steady, and governing response speed is accelerated；The output of coal pulverizer can be improved, so as to advantageously in safety and stability
Production；The pressure loss in coal pulverizer can be reduced, so as to reach the purpose for reducing electrical energy consumption of ventilation；Nozzle ring is easy for installation,
And service life is grown, so as to extend the time between overhauls(TBO), maintenance cost is saved.
Underload coal pulverizer list mill, more mill stable operation technologies
According to the utility model, when pulverized coal preparation system reaches one mill service condition, as coal pulverizer inlet wind-warm syndrome reaches mill
Coal machine condition of work, you can carry out layering coal pulverizer list mill and put into operation, auxiliary burner underload puts into operation；Due to being carried out to coal pulverizer
Comprehensive reformation, it is possible to achieve coal pulverizer nominal output starts below 20%, stable operation, and then realizes the more same lucks of coal pulverizer
OK, the requirement of boiler ultra-low load peak regulation safe and stable operation is ensured.
Coal pulverizer loading system is optimized and revised
Including being checked, being calculated to the coal pulverizer loading system used at present, it is determined that coal pulverizer minimum output model at present
Enclose；Current coal pulverizer loading system is adjusted, coal pulverizer loading system part is changed in part；It is improved to design optimization
Coal pulverizer loading system is adjusted, and meets that transformation requires.
Above-mentioned every renovation technique of the present utility model preferably uses in combination, is imitated with obtaining optimal technology
Fruit.
The utility model is described in detail in conjunction with specific embodiments above.It is it is obvious that of the present utility model
Above-described embodiment should be construed as it is exemplary, rather than to limitation of the present utility model.In fact, the technology for this area
For personnel, various variations or modifications can be carried out to it on the basis of the utility model.For example, although Figure 1B is with example
Mode gives each layer burning in single angle according to the improved fired power generating unit tangentially firing boiler of an embodiment of the present utility model
The specific arrangement of device, it is readily understood that the particular number of wherein each burner (and its spout), the number of plies, position etc. can
According to concrete practice or to be actually needed and carry out necessary adjustment.Obviously, these variations or modifications are all without departing from the utility model
Spirit and scope.In addition, it should be noted that, some parts or technical characteristic in above-described embodiment of the present utility model can be with
Use, and to save space, all details of involved component are not carried out in the description of the present application separately or in combination
Detailed description.The details for being not directed on these or not being described in detail, those skilled in the art can be in originals of the present utility model
Existing knowledge or common knowledge etc. on the basis of reason with reference to this area are easily understood that or concrete application.
Reference numerals list
1 original after-flame wind system
2 original secondary wind combustors in top
3 original secondary wind combustors
4 original tiny-oil ignitions or plasma pulverized coal ignition burner
5 original wind combustors
The high-order separation after-flame wind system that 6 classifications are sent into
The 7 adherent wind combustors in top
8 high-order burning gradual combustors
The 9 secondary wind combustors of biasing
10 vertical strong/weak tiny-oil ignitions or plasma pulverized coal ignition burner
11 vertical strong/weak coal burners
21 drivers
22 reductors
23 coal dusts are classified converter
24 rotor blades
25 stator blades
26 times powder cones
31 sound combine rotary separator
32 loading frames
33 pull bars
34 nozzle rings
35 hydraulic cylinders
41 rotating rings
42 stationary rings
43 millstone sheets
44 mills
45 rotating ring blades.
Claims (10)
1. a kind of combustion system, it is used in the fired power generating unit tangentially firing boiler suitable for Ultra-low load operation, and its feature exists
In the combustion system is single flow pulverized coal combustion system, and is included including multiple burner groups, each burner group as master
The high-order coal burner of wind combustor of the superiors in combustion zone and be arranged in main burning area it is a number of other once
Wind combustor, wherein, the high-order coal burner is configured to two-layer high position fuel-staged combustion device and/or the multiple
Other wind combustors are configured to vertical strong/weak coal burner.
2. combustion system according to claim 1, it is characterised in that the multiple burner group is to be arranged with corner, directly
Flow four burner groups of tangential combustion configuration.
3. combustion system according to claim 1 or 2, it is characterised in that
The pulverized coal channel of the porch of the two-layer high position fuel-staged combustion device is provided with coal dust classification converter, will enter
The Pulverized Coal for entering the two-layer high position fuel-staged combustion device is divided into pure dense pure light two-stage and carries out stratified combustion, described
The nozzle of two-layer high position fuel-staged combustion device is provided with multiple bluff bodies；And/or
Baffle-type pulverized coal concentrator is provided with a wind pipe of the vertical strong/weak coal burner, and described vertical dense
Horizontally disposed shunting bluff body is provided with the spout of thin powdered coal burner, to cause into the vertical strong/weak coal burner
Pulverized Coal forms two strands of dense, thin powdered coal air-flows, and multiple vertical strong/weak coal burners are with " the same as mutually adjacent affine stable combustion
Burn " mode arrange, i.e., arrange to the adjacent ports " same to concentrated phase " of multiple vertical strong/weak coal burners or " with light phase ".
4. combustion system according to claim 3, it is characterised in that in the back-fire side of the vertical strong/weak coal burner
Provided with bias-signal-modulated noise spout.
5. combustion system according to claim 1 or 2, it is characterised in that each burner group also includes with lower member
One or more：
The high-order separation after-flame wind system that multiple field classification is sent into, it is located at the top in main burning area and protected with the main burning area
Certain distance is held, wherein each fire air nozzle of the high-order separation after-flame wind system is respectively adopted independent blowing system, and by
It is configured to vertically carry out bidirectional swinging with horizontal direction respectively；
The secondary wind combustor of biasing being arranged in main burning area, wherein the spout of the secondary wind combustor of biasing is fiery towards the back of the body
Lateral deviation is put；
The adherent wind combustor in top being arranged in main burning area, it is located on the high-order burning gradual combustor of the two-layer
Side, and spray Secondary Air from the spout both sides of the adherent wind combustor in the top；
Vertical strong/weak tiny-oil ignition or plasma pulverized coal ignition burner, it is arranged on master as the orlop burner in main burning area
In combustion zone, wherein pulverized coal concentrator is provided with the vertical strong/weak tiny-oil ignition or plasma pulverized coal ignition burner, so as to enter
The coal dust for entering the vertical strong/weak tiny-oil ignition or plasma pulverized coal ignition burner forms two strands of dense, thin powdered coal air-flows, and described
Vertical strong/weak tiny-oil ignition or plasma pulverized coal ignition burner and adjacent vertical strong/weak coal burner are with the side of " dense affine "
Formula is arranged.
6. a kind of fired power generating unit tangentially firing boiler suitable for Ultra-low load operation, it is characterised in that described to be suitable to ultra-low load
The fired power generating unit tangentially firing boiler of operation includes the combustion system and powder system processed according to any one of claim 1-5
System, wherein the pulverized coal preparation system includes the coal pulverizer with sound combination rotary separator.
7. the fired power generating unit tangentially firing boiler according to claim 6 suitable for Ultra-low load operation, it is characterised in that institute
It is pressurized direct pulverizing coal system to state pulverized coal preparation system, and the sound combination rotary separator includes driver, reductor, coal dust point
Level conversion device, rotor blade, stator blade and time powder cone, the driver is connected with the reductor by shaft coupling, described
Rotor blade is connected in the hollow shaft of the sound combination rotary separator, and the stator blade is arranged on the sound combination
Between the housing of rotary separator and the rotor blade.
8. the fired power generating unit tangentially firing boiler according to claim 7 suitable for Ultra-low load operation, it is characterised in that institute
State stator blade and be configured to that there is adjustable setting angle.
9. the fired power generating unit tangentially firing boiler according to claim 6 suitable for Ultra-low load operation, it is characterised in that institute
Stating coal pulverizer has entrance Split assembled rotary spray nozzle ring, and the entrance Split assembled rotary spray nozzle ring includes rotating ring, stationary ring, mill
Disk watt and mill, the rotating ring are bolted with the mill, and the stationary ring is fixed on the barrel of coal pulverizer.
10. the fired power generating unit tangentially firing boiler according to claim 6 suitable for Ultra-low load operation, it is characterised in that
The coal pulverizer carries out stratified combustion when pulverized coal preparation system reaches one mill service condition, coal pulverizer list mill operation and can be with
The mode of double mills or more mill operation simultaneously works.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721237176.4U CN207196470U (en) | 2017-09-26 | 2017-09-26 | Fired power generating unit tangentially firing boiler and its combustion system suitable for Ultra-low load operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721237176.4U CN207196470U (en) | 2017-09-26 | 2017-09-26 | Fired power generating unit tangentially firing boiler and its combustion system suitable for Ultra-low load operation |
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| Publication Number | Publication Date |
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| CN207196470U true CN207196470U (en) | 2018-04-06 |
Family
ID=61786372
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721237176.4U Withdrawn - After Issue CN207196470U (en) | 2017-09-26 | 2017-09-26 | Fired power generating unit tangentially firing boiler and its combustion system suitable for Ultra-low load operation |
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| Country | Link |
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| CN (1) | CN207196470U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109556107A (en) * | 2017-09-26 | 2019-04-02 | 哈尔滨博深科技发展有限公司 | Fired power generating unit tangentially firing boiler and its combustion system suitable for Ultra-low load operation |
| CN110081423A (en) * | 2019-05-15 | 2019-08-02 | 哈尔滨锅炉厂有限责任公司 | A kind of coal burner meeting medium and small pulverized-coal fired boiler ultra-low load operating condition operation |
| CN111023071A (en) * | 2018-10-10 | 2020-04-17 | 中国石油化工股份有限公司 | Operation method of SCR denitration pulverized coal boiler |
-
2017
- 2017-09-26 CN CN201721237176.4U patent/CN207196470U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109556107A (en) * | 2017-09-26 | 2019-04-02 | 哈尔滨博深科技发展有限公司 | Fired power generating unit tangentially firing boiler and its combustion system suitable for Ultra-low load operation |
| CN109556107B (en) * | 2017-09-26 | 2024-04-12 | 哈尔滨博深科技发展有限公司 | Thermal power generating unit tangential firing boiler suitable for ultralow load operation and firing system thereof |
| CN111023071A (en) * | 2018-10-10 | 2020-04-17 | 中国石油化工股份有限公司 | Operation method of SCR denitration pulverized coal boiler |
| CN110081423A (en) * | 2019-05-15 | 2019-08-02 | 哈尔滨锅炉厂有限责任公司 | A kind of coal burner meeting medium and small pulverized-coal fired boiler ultra-low load operating condition operation |
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