CN109578991A - A kind of accurate blowing system of pulverized-coal fired boiler - Google Patents
A kind of accurate blowing system of pulverized-coal fired boiler Download PDFInfo
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- CN109578991A CN109578991A CN201811457622.1A CN201811457622A CN109578991A CN 109578991 A CN109578991 A CN 109578991A CN 201811457622 A CN201811457622 A CN 201811457622A CN 109578991 A CN109578991 A CN 109578991A
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- air duct
- wall
- angie type
- flame
- annular passage
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Classifications
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- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
Abstract
The present invention relates to field of boilers, more particularly to a kind of accurate blowing system of pulverized-coal fired boiler, including total air duct, annular passage, angie type secondary air duct, wall secondary air duct, angie type after-flame air duct, wall after-flame air duct, angie type overfire air port, wall overfire air port, angie type fire air nozzle, wall fire air nozzle, a wind snout and furnace wall water screen tube；The main air duct end is connected to annular passage, the monnolithic case of the annular passage is rounded square, branch air duct is provided in annular passage vertical direction, it is wall air duct that annular passage four edges midpoint, which is arranged in, and it is angie type air duct that four Angle Positions of annular passage, which are arranged in,；The present invention has the advantages that being matched by the combustion-supporting wind snout inside the annular bellows and burner hearth outside burner hearth, to realize accurate air distribution and the covering of the full burner hearth total space of burner hearth different zones.
Description
Technical field
The present invention relates to field of boilers more particularly to a kind of accurate blowing systems of pulverized-coal fired boiler.
Background technique
The combustion apparatus that coal fired boiler of power plant uses is known as coal burner.Its main function are as follows: (1) to boiler furnace
Interior conveying fuel and air；(2) tissue fuel and air are timely, are sufficiently mixed；(3) guarantee fuel catch fire as early as possible, after-flame.
Coal burner is divided into parallel flow burner and two kinds of vortex burner.When boiler uses parallel flow burner
When, breeze airflow forms direct jet after spout injection, generates tangential swirl flame at burner hearth center, i.e., so-called quadrangle is cut
Garden combustion system.Air needed for coal dust firing is divided into First air and Secondary Air, i.e. fuel air and combustion air.Wind action
It is that coal dust is sent into burner hearth, and oxygen amount needed for supplying coal powder ignition stage volatile combustion；Secondary Air catches fire in breeze airflow
After be mixed into, supply coal in coke and residual volatile matter after-flame needed for oxygen amount, to guarantee coal dust completely burned.
Boiler can effectively inhibit NO in process of coal combustion using low nitrogen burning modexGeneration, finally reduce NOx
Concentration of emission.Current low-NO_x combustion technology is mainly air staged combustion technology, by changing boiler-burner structure and matching
Wind mode is upwardly formed main burner area, reducing zone and burning-out zone in furnace height side.Main burner area arrangement First air and
Secondary Air, air quantity account for about the 70-80% of total blast volume, guarantee coal dust initiation combustion；Burnout degree is arranged above main burner, is accounted for about
The 20-30% of total blast volume guarantees coal dust later period after-flame；Main reducing zone is formd between main burner area and burning-out zone.
After air staged combustion technology, by changing boiler wind speed adjustment mode, portion of air is separated to burning
It is used as burnout degree at the top of device, is upwardly formed main burner area, reducing zone and burning-out zone in furnace height side, inhibits coal dust firing mistake
NO in journeyxGeneration, the NO of furnace outlet is effectively reducedxConcentration of emission.But main burner area is anoxycausis, coal powder ignition
It postpones, efficiency of combustion decline, CO concentration, unburned carbon in flue dust increase, load responding speed reduces；It is generated in high temperature near wall region a large amount of
Reducing atmosphere easily causes water-cooling wall coking, high temperature corrosion；Heat flux distribution change easily causes furnace outlet gas temperature raising, vapour
Temperature abnormality, spray water flux increase, tube wall temperature increases；In addition, because of main burner area air quantity mistake caused by boiler wind speed adjustment system defect
Big and burning-out zone air quantity is too small, low nitrogen burning is ineffective, the NO of furnace outletxConcentration of emission is higher, especially in underload work
Condition is significantly raised, exceeds denitrification apparatus limiting value often.
After coal-burning boiler application low-NO_x combustion technology, the NO of boiler exportxConcentration of emission reaches 200~500mg/Nm3。
If cooperating gas denitrifying technology, coal unit NO can be madexDischarge reaches 50mg/Nm3Below.Low-NO_x combustion technology is at present with air
Be classified as core, in furnace inner tissue ignition temperature, atmosphere and residence time, facilitate early stage, strong coal dust quick ignition owes
Oxygen burning, inhibits or restores the NO generated using the amino intermediate product that combustion process generatesx。
Patent document (application number: 201210236354.7) " pulverized-coal fired boiler with attached wall Secondary Air and grid burnout degree "
Propose a kind of pulverized-coal fired boiler with attached wall Secondary Air and grid burnout degree, realize efficiency of combustion do not reduce, burner hearth not slagging,
NO under gas temperature windage minor premisexMinimum discharge, but the attached wall Secondary Air in primary zone cannot blend very well far from coal dust power stream
Combustion-supporting, the attached wall Secondary Air of reducing zone can destroy NOxReduction effect simultaneously causes spout peripheral regions to hang coke, lacks and matches therewith
Blowing system (secondary air box) to realize the reasonable distribution of Secondary Air and burnout degree.
A kind of patent document (application number: 201210236354.7) " the low NO of Secondary Air wall deep-gradedxCombustion method and
Device " and patent document (application number: the 201420748890.X) furnace body of overfire air jet " setting biasing " be all propose by
Part Secondary Air from furnace wall spray into burner hearth, prevent water-cooling wall overtemperature, slagging and corrosion, not using entire burner hearth large space as pair
As comprehensively considering, and burnout degree degree of filling is inadequate, covering surface is limited will affect coal dust later period after-flame.
Patent document (application number: 201520721770.5) " tangential boiler Researched of Air Staging Combustion Burning Pulverized Coal vertical-horizontal combination arrangement
Combustion exhausted wind apparatus " and patent document (application number: 201320824147.3) " Process In A Tangential Firing combined type after-flame wind system "
It is proposed the combined type after-flame wind system of angie type and the combination of wall burnout degree, guarantees to improve coal dust while reducing nitrogen oxides
Burn-up efficiency, but not using burner hearth large space as object by Anti-slagging, anticorrosion, efficient burning as reduce NOxPrecondition
Comprehensively consider, especially will lead to low nitrogen burning less effective when main burner region air distribution is unreasonable.
In existing Researched of Air Staging Combustion Burning Pulverized Coal, burner hearth folding corner region is the inefficient area of peroxide low temperature, in higher oxygen concentration conditions
Lower fugitive constituent largely generates NO while burning, but the lower coke burn rate of temperature is not high；Furnace wall cooling is formed about
The inefficient area of hypoxemia low temperature, there are a large amount of carbon residues in this region, burn under the conditions of hypothermia and hypoxia and stay cool substantially, increase residual
Charcoal adheres to water-cooling wall risk.Due to foring the unmatched inefficient area of multiple characteristics inside burner hearth, burning controllability sharply under
Drop, primary zone wind powder blend turbulivity decline, and effective use space further decreases in burner hearth, and it is dense more wind powder occur
Degree, temperature mismatch area, and burn rate and combustion intensity are greatly reduced in furnace.
Air classification technology superiority and inferiority depends on boiler wind speed adjustment system, and core is the distribution of combustion air.Therefore it needs
The full burner hearth total space of eye is sent into suitable combustion air in reasonable position, improves the effective use efficiency for entering combustion air in furnace,
It greatly improves and efficiently uses space in furnace, and improve furnace flame degree of filling, ultimately form the ultralow NO of total space multiple jet flowxCombustion
It burns.A set of completely new boiler wind speed adjustment system is needed thus, and the accurate air distribution and full burner hearth of Lai Shixian burner hearth different zones are entirely empty
Between cover.
Summary of the invention
To solve the above problems, passing through the annular outside burner hearth we have proposed a kind of accurate blowing system of pulverized-coal fired boiler
Bellows are matched with the combustion-supporting wind snout inside burner hearth, with realize burner hearth different zones accurate air distribution and the full burner hearth total space
Covering.
To realize the demand, the present invention is through the following technical solutions to achieve the above objectives: a kind of pulverized-coal fired boiler is accurate
Blowing system, including total air duct, annular passage, angie type secondary air duct, wall secondary air duct, angie type after-flame air duct, wall after-flame
Air duct, angie type overfire air port, wall overfire air port, angie type fire air nozzle, wall fire air nozzle, a wind snout and
Furnace wall water screen tube；
The main air duct end is connected to annular passage, and the monnolithic case of the annular passage is rounded square, annular
Branch air duct is provided in the vertical direction of air duct, it is wall air duct that annular passage four edges midpoint, which is arranged in, and setting exists
Four Angle Positions of annular passage are angie type air duct；
It is wall secondary air duct that the wall air duct, which is vertically set below annular passage, and the wall air duct is vertically set
Setting above annular passage is wall after-flame air duct；It is angie type two that the angie type air duct, which is vertically set below annular passage,
Secondary air duct, it is angie type after-flame air duct that the angie type air duct, which is vertically set on above annular passage,；
Wall overfire air port is provided on the wall secondary air duct, wall after-flame is provided with wall burnout degree on air duct
Spout；A wind snout and angie type overfire air port are provided on the angie type secondary air duct, angie type after-flame is provided on air duct
Angie type fire air nozzle；
Region in boiler between angie type secondary air duct top and bottom end is main combustion zone, the angie type secondary air duct
Top to the region between the bottom end of angie type after-flame air duct be reducing zone, angie type after-flame air duct bottom end to the region between top
For burning-out zone.
Further, the accurate blowing system of pulverized-coal fired boiler, the wall air duct are provided with four, wall after-flame air duct
Four are provided with, the wall secondary air duct is provided with four；The angie type air duct is provided with four, angie type after-flame air duct
Four are provided with, the angie type secondary air duct is provided with four.
Further, wall overfire air port number is arranged on every wall secondary air duct for the accurate blowing system of pulverized-coal fired boiler
>=1 is measured, wall fire air nozzle quantity >=1 is set on every wall after-flame air duct；It is arranged on every angie type secondary air duct
Angie type overfire air port quantity >=2, wind snout quantity >=1, every angie type after-flame air duct are provided with angie type burnout degree
Spout quantity >=1.
Further, the accurate blowing system of pulverized-coal fired boiler, main burner area height H1 are 0 < H1≤40.0m；Reducing zone is high
Degree H2 and burning-out zone height H3 meets the following conditions: 0 H2/H1≤3.0 < and 0 H3/H1≤2.0 <.
Further, the accurate blowing system of pulverized-coal fired boiler, total air duct height H4 are 0 < H4≤20m, annular passage height
H5, secondary air duct height H6 and after-flame air duct height H7 meet the following conditions: 0 H5/H4≤5.0 <, 0 H6/H5≤5.0 < and 0
H7/H5≤5.0 <.
Further, the accurate blowing system of pulverized-coal fired boiler, total air duct width D 1, annular passage width D 2 and annular wind
The proportional region of road and furnace wall space D 3 meets the following conditions: 0 < D1≤10.0m, 0 D2/D1≤1.0 < and 0 < D3/D1≤
2.0。
Further, the accurate blowing system of pulverized-coal fired boiler, the ratio of secondary air duct width L1 and overfire air port width L2
Range meets the following conditions: 0 < L1≤5.0m and 0 L2/L1≤1.0 <；Burnout degree road width L3 and fire air nozzle width L4
Proportional region meet the following conditions: 0 < L3≤0.5m and 0 L4/L3≤1 <.
Further, the accurate blowing system of pulverized-coal fired boiler, wall overfire air port and furnace wall angle α 1, wall burnout degree spray
The proportional region of mouth and furnace wall angle α 2 meets the following conditions: 1≤180 ° of 0 °≤α and 2≤180 ° of 0 °≤α.
The accurate blowing system of a kind of pulverized-coal fired boiler provided by the invention, inside the annular bellows and burner hearth outside burner hearth
Combustion-supporting wind snout match, with realize burner hearth different zones accurate air distribution and the full burner hearth total space covering.The air distribution system
System is not only upwardly formed main burner area, reducing zone and combustion in furnace height side like that like traditional air staged combustion technology
Full furnace cavity is further divided into multiple function cells by area to the greatest extent, i.e., high-temperature low-oxygen reducing zone, low temperature hyperoxia high efficient district,
High temperature hyperoxia burning-out zone；Overall process of burning in furnace is divided into multiple functional response rings whirlpool, thus in furnace inner space and combustion chemistry
Energy-efficient (Efficient) is formed in reaction process, discharges controllable (Emission control), anti-caking slag corrosion
The integration of (Erosion resistance) three zones.
The present invention provides a kind of accurate blowing system of pulverized-coal fired boiler, inside the annular bellows and burner hearth outside burner hearth
Combustion-supporting wind snout matches, to realize accurate air distribution and the covering of the full burner hearth total space of burner hearth different zones；Coal dust firing institute
The combustion air needed all enters annular passage by total air duct, forms isobaric space, guarantees that air distribution is uniform；Angie type secondary air duct and angle
Formula overfire air port matches, to four angular zone of lower furnace portion feeding combustion air, oxygen amount needed for both having met coal dust initiation combustion,
Promote volatile matter to be precipitated completely again to realize that NO is restored, forms high-temperature low-oxygen reducing zone；Wall secondary air duct and wall Secondary Air
Spout matches, and is sent into combustion air to lower furnace portion wall area, sufficiently blends to be formed with the tangential swirling eddy in burner hearth center
Standing vortex extends the coal dust residence time, strengthens coke burning, while slagging prevention and high temperature corrosion, forms low temperature hyperoxia high efficient district；
Angie type after-flame air duct is matched with angie type fire air nozzle, burnout degree is sent into four angular zone of upper furnace, after providing coal dust
Oxygen amount needed for phase after-flame guarantees burn-up efficiency, while eliminating tangential firing and being formed by rotation surplus, forms high temperature hyperoxia after-flame
Area；Wall after-flame air duct is matched with wall fire air nozzle, is sent into burnout degree to upper furnace wall area, is realized after-flame
Wind gridding covering, eliminates C, the CO in side wall area, forms low temperature hyperoxia high efficient district.
The beneficial effects of the present invention are: it is mating by the combustion-supporting wind snout inside the annular bellows and burner hearth outside burner hearth
It uses, to realize accurate air distribution and the covering of the full burner hearth total space of burner hearth different zones.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described.It is clear that the accompanying drawings in the following description is of the invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other attached drawings.
Fig. 1 is the front schematic view of the accurate blowing system embodiment 1 of pulverized-coal fired boiler.Arrow in figure, which illustrates in air duct, to flow
The flow direction of body；
Fig. 2 is the side schematic view of the accurate blowing system embodiment 1 of pulverized-coal fired boiler；
Fig. 3 is the secondary air duct and overfire air port arrangement schematic diagram of the accurate blowing system embodiment 1 of pulverized-coal fired boiler；
Fig. 4 is total air duct and the annular passage arrangement schematic diagram of the accurate blowing system embodiment 1 of pulverized-coal fired boiler；
Fig. 5 is after-flame air duct and the fire air nozzle arrangement schematic diagram of the accurate blowing system embodiment 1 of pulverized-coal fired boiler；
Fig. 6 is the secondary air duct and overfire air port arrangement schematic diagram of the accurate blowing system embodiment 2 of pulverized-coal fired boiler；
Fig. 7 is total air duct and the annular passage arrangement schematic diagram of the accurate blowing system embodiment 3 of pulverized-coal fired boiler；
Fig. 8 is the secondary air duct and overfire air port arrangement schematic diagram of the accurate blowing system embodiment 4 of pulverized-coal fired boiler；
In figure, total air duct 1, annular passage 2, angie type secondary air duct 3, wall secondary air duct 4, angie type after-flame air duct 5, wall
After-flame air duct 6, angie type overfire air port 7, wall overfire air port 8, angie type fire air nozzle 9, wall fire air nozzle 10, one
Secondary wind snout 11, furnace wall water screen tube 12.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described.Obviously, described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Embodiment 1:
A kind of accurate blowing system of pulverized-coal fired boiler, including total air duct 1, annular passage 2, angie type secondary air duct 3, wall are secondary
Air duct 4, angie type after-flame air duct 5, wall after-flame air duct 6, angie type overfire air port 7, wall overfire air port 8, angie type burnout degree
Spout 9,10, wind snouts 11 of wall fire air nozzle and furnace wall water screen tube 12；
The main air duct end is connected to annular passage, and the monnolithic case of the annular passage is rounded square, annular
Branch air duct is provided in the vertical direction of air duct, it is wall air duct that annular passage four edges midpoint, which is arranged in, and setting exists
Four Angle Positions of annular passage are angie type air duct；
It is wall secondary air duct that the wall air duct, which is vertically set below annular passage, and the wall air duct is vertically set
Setting above annular passage is wall after-flame air duct；It is angie type two that the angie type air duct, which is vertically set below annular passage,
Secondary air duct, it is angie type after-flame air duct that the angie type air duct, which is vertically set on above annular passage,；
Wall overfire air port is provided on the wall secondary air duct, wall after-flame is provided with wall burnout degree on air duct
Spout；A wind snout and angie type overfire air port are provided on the angie type secondary air duct, angie type after-flame is provided on air duct
Angie type fire air nozzle；
Region in boiler between angie type secondary air duct top and bottom end is main combustion zone, the angie type secondary air duct
Top to the region between the bottom end of angie type after-flame air duct be reducing zone, angie type after-flame air duct bottom end to the region between top
For burning-out zone.
The wall air duct is provided with four, and wall after-flame air duct is provided with four, and the wall secondary air duct is set
It is equipped with four；The angie type air duct is provided with four, and angie type after-flame air duct is provided with four, and the angie type secondary air duct is set
It is equipped with four.
Wall overfire air port quantity 3 is set on every wall secondary air duct, wall is set on every wall after-flame air duct
Formula fire air nozzle quantity 2；Angie type overfire air port quantity 4, a wind snout number are set on every angie type secondary air duct
Amount 3, every angie type after-flame air duct is provided with angie type fire air nozzle quantity 2.
Main burner area height H1 is 40.0m；Reducing zone height H2 and burning-out zone height H3 meet the following conditions: H2/H1
=3.0 and H3/H1=2.0.
Total air duct height H4 is 20m, annular passage height H5, secondary air duct height H6 and after-flame air duct height H7 meet with
Lower condition: H5/H4=5.0, H6/H5=5.0 and H7/H5=5.0.
The proportional region of total air duct width D 1, annular passage width D 2 and annular passage and furnace wall space D 3 meet with
Lower condition: D1=10.0m, D2/D1=1.0 and D3/D1=2.0.
The proportional region of secondary air duct width L1 and overfire air port width L2 meet the following conditions: L1=5.0m and L2/
L1=1.0；The proportional region of burnout degree road width L3 and fire air nozzle width L4 meet the following conditions: L3=0.5m and L4/
L3=1.
The proportional region of wall overfire air port and furnace wall angle α 1, wall fire air nozzle and furnace wall angle α 2 meet with
Lower condition: α 1=90 ° and α 2=90 °.
The accurate blowing system of a kind of pulverized-coal fired boiler provided in this embodiment, by the annular bellows and burner hearth outside burner hearth
The combustion-supporting wind snout in portion matches, to realize accurate air distribution and the covering of the full burner hearth total space of burner hearth different zones.The air distribution
System not only like traditional air staged combustion technology like that furnace height side be upwardly formed main burner area, reducing zone and
Full furnace cavity is further divided into multiple function cells by burning-out zone, i.e. high-temperature low-oxygen reducing zone, low temperature hyperoxia is efficient
Area, high temperature hyperoxia burning-out zone；Overall process of burning in furnace is divided into multiple functional response rings whirlpool, thus in furnace inner space and burningization
It learns and forms energy-efficient (Efficient) in reaction process, discharges controllable (Emission control), anti-caking slag corrosion
The integration of (Erosion resistance) three zones.
The present embodiment provides a kind of accurate blowing systems of pulverized-coal fired boiler, inside the annular bellows and burner hearth outside burner hearth
Combustion-supporting wind snout match, with realize burner hearth different zones accurate air distribution and the full burner hearth total space covering；Coal dust firing
Required combustion air all enters annular passage by total air duct, forms isobaric space, guarantees that air distribution is uniform；Angie type secondary air duct with
Angie type overfire air port matches, and is sent into combustion air to four angular zone of lower furnace portion, had both met coal dust initiation combustion requisite oxygen
Amount promotes volatile matter to be precipitated completely again to realize that NO is restored, and forms high-temperature low-oxygen reducing zone；Wall secondary air duct and wall are secondary
Wind snout matches, and is sent into combustion air to lower furnace portion wall area, sufficiently blends shape with the tangential swirling eddy in burner hearth center
At standing vortex, extends the coal dust residence time, strengthens coke burning, while slagging prevention and high temperature corrosion, it is efficient to form low temperature hyperoxia
Area；Angie type after-flame air duct is matched with angie type fire air nozzle, is sent into burnout degree to four angular zone of upper furnace, is provided coal dust
Oxygen amount needed for later period after-flame guarantees burn-up efficiency, while eliminating tangential firing and being formed by rotation surplus, forms the combustion of high temperature hyperoxia
Area to the greatest extent；Wall after-flame air duct is matched with wall fire air nozzle, is sent into burnout degree to upper furnace wall area, is realized combustion
Wind gridding covering to the greatest extent, eliminates C, the CO in side wall area, forms low temperature hyperoxia high efficient district.
The beneficial effect of the present embodiment is: being matched by the combustion-supporting wind snout inside the annular bellows and burner hearth outside burner hearth
Set uses, to realize accurate air distribution and the covering of the full burner hearth total space of burner hearth different zones.
Embodiment 2:
Relative to the technology alternative that embodiment 1 carries out, as shown in figures 1 to 6, wall secondary air duct 4 and wall Secondary Air
Spout 8 may be arranged at the one or both sides of furnace wall center line, i.e., is needed to distinguish cloth on the furnace wall of four sides according to Actual combustion air distribution
Set a column or two column wall overfire air ports 8.
Embodiment 3:
Relative to the technology alternative that embodiment 1 carries out, as shown in figs. 1-7, combustion air needed for coal dust firing is whole
Total air duct 1 by being arranged in burner hearth two sides enters annular passage 2.And annular passage 2 can be designed using non-constant section: burner hearth
The air duct of both walls is larger and the air duct of front-back wall is smaller, i.e., both walls air duct is main air duct, front-back wall air duct is contact air duct.
Embodiment 4:
Relative to the technology alternative that embodiment 1 carries out, as shown in figures 1-8, wall after-flame air duct 6 and wall burnout degree
Spout 10 may be arranged at the one or both sides of furnace wall center line, i.e., is needed to distinguish cloth on the furnace wall of four sides according to Actual combustion air distribution
Set a column or two column wall fire air nozzles 10.
Claims (8)
1. a kind of accurate blowing system of pulverized-coal fired boiler, it is characterised in that: including total air duct, annular passage, angie type secondary air duct, wall
Formula secondary air duct, angie type after-flame air duct, wall after-flame air duct, angie type overfire air port, wall overfire air port, angie type burnout degree
Spout, wall fire air nozzle, a wind snout and furnace wall water screen tube；
The main air duct end is connected to annular passage, and the monnolithic case of the annular passage is rounded square, annular passage
Branch air duct is provided in vertical direction, it is wall air duct that annular passage four edges midpoint, which is arranged in, is arranged in annular
Four, air duct Angle Position is angie type air duct；
It is wall secondary air duct that the wall air duct, which is vertically set below annular passage, and the wall air duct is vertically set on
It is wall after-flame air duct above annular passage；It is angie type Secondary Air that the angie type air duct, which is vertically set below annular passage,
Road, it is angie type after-flame air duct that the angie type air duct, which is vertically set on above annular passage,；
It is provided with wall overfire air port on the wall secondary air duct, the spray of wall burnout degree is provided on wall after-flame air duct
Mouthful；A wind snout and angie type overfire air port are provided on the angie type secondary air duct, angie type after-flame is provided with angle on air duct
Formula fire air nozzle；
Region in boiler between angie type secondary air duct top and bottom end is main combustion zone, angie type secondary air duct top
It is reducing zone to the region between the bottom end of angie type after-flame air duct, angie type after-flame air duct bottom end to the region between top is combustion
Area to the greatest extent.
2. the accurate blowing system of pulverized-coal fired boiler as described in claim 1, it is characterised in that: the wall air duct is provided with four
Item, wall after-flame air duct are provided with four, and the wall secondary air duct is provided with four；The angie type air duct is provided with four
Item, angie type after-flame air duct are provided with four, and the angie type secondary air duct is provided with four.
3. the accurate blowing system of pulverized-coal fired boiler as claimed in claim 2, it is characterised in that: be arranged on every wall secondary air duct
Wall fire air nozzle quantity >=1 is arranged on every wall after-flame air duct for wall overfire air port quantity >=1；Every angle
Angie type overfire air port quantity >=2, wind snout quantity >=1, every angie type after-flame air duct are set on formula secondary air duct
It is provided with angie type fire air nozzle quantity >=1.
4. the accurate blowing system of pulverized-coal fired boiler as described in claim 1, it is characterised in that: main burner area height H1 is 0 <
H1≤40.0m；Reducing zone height H2 and burning-out zone height H3 meets the following conditions: 0 H2/H1≤3.0 < and 0 < H3/H1≤
2.0。
5. the accurate blowing system of pulverized-coal fired boiler as described in claim 1, it is characterised in that: total air duct height H4 be 0 < H4≤
20m, annular passage height H5, secondary air duct height H6 and after-flame air duct height H7 meet the following conditions: 0 H5/H4≤5.0 <, 0
H6/H5≤5.0 < and 0 H7/H5≤5.0 <.
6. the accurate blowing system of pulverized-coal fired boiler as described in claim 1, it is characterised in that: total air duct width D 1, annular
Air duct width D 2 and annular passage and the proportional region of furnace wall space D 3 meet the following conditions: 0 < D1≤10.0m, 0 < D2/D1
≤ 1.0 and 0 D3/D1≤2.0 <.
7. the accurate blowing system of pulverized-coal fired boiler as described in claim 1, it is characterised in that: secondary air duct width L1 and Secondary Air
The proportional region of width of jet L2 meets the following conditions: 0 < L1≤5.0m and 0 L2/L1≤1.0 <；Burnout degree road width L3 and
The proportional region of fire air nozzle width L4 meets the following conditions: 0 < L3≤0.5m and 0 L4/L3≤1 <.
8. the accurate blowing system of pulverized-coal fired boiler as described in claim 1, it is characterised in that: wall overfire air port and furnace wall press from both sides
Angle α 1, wall fire air nozzle and furnace wall angle α 2 proportional region meet the following conditions: 1≤180 ° of 0 °≤α and 0 °≤α 2≤
180°。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110107911A (en) * | 2019-04-30 | 2019-08-09 | 华电电力科学研究院有限公司 | A kind of novel secondary wind system and its working method for face-fired boiler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110107911A (en) * | 2019-04-30 | 2019-08-09 | 华电电力科学研究院有限公司 | A kind of novel secondary wind system and its working method for face-fired boiler |
| CN110107911B (en) * | 2019-04-30 | 2023-09-08 | 华电电力科学研究院有限公司 | Secondary air system for opposed firing boiler and working method thereof |
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