CN106765074B - A kind of coal dust circulation vertical line combustion flame generator - Google Patents
A kind of coal dust circulation vertical line combustion flame generator Download PDFInfo
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- CN106765074B CN106765074B CN201611034793.4A CN201611034793A CN106765074B CN 106765074 B CN106765074 B CN 106765074B CN 201611034793 A CN201611034793 A CN 201611034793A CN 106765074 B CN106765074 B CN 106765074B
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- air
- combustion chamber
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- upright
- coal dust
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
- F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
- F23D2201/20—Fuel flow guiding devices
Abstract
The invention discloses a kind of coal dust circulation vertical line combustion flame generators, belong to coal powder fired boiler burner technical field.Flame generating means, including flame generating means main body, the flame generating means body interior forms the flame generation cavity of upright combustion chamber and the upright combustion chamber lower part of connection, upright combustion chamber top is equipped with crater, upright bottom of combustion chamber is equipped with slag-drip opening, the flame generation cavity connection First air and coal dust jet pipe, the position that First air and coal dust jet pipe enter before flame generation cavity is also connected to secondary air channel, the tertiary-air pipe group of circumferentially tangential direction more than two setting air outlet is equipped in the upright combustion chamber, all tertiary-air pipe groups are connected to the wind inlet three times above upright combustion chamber.The present invention has the characteristics that safe and environment-friendly, energy saving, it can be achieved that liquid, dry ash extraction, are suitble to the long-term continuous burning such as oilfield gas injection and boiler to use.
Description
Technical field
The present invention relates to coal powder fired boiler burner technical fields, particularly relate to a kind of coal dust circulation vertical line combustion flame generation
Device.
Background technique
Chinese industrial kiln coal utilizaton rate and environmental pollution gap compared with World Developed Countries are very big, therefore study one
Kind clean combustion of coal power-saving technology is the task of top priority.
Existing horizontal cyclone burner needs to build refractory brick secondary furnace (often runout is leaked out), and principle is: wind coal
Mixture is injected directly into combustion chamber, burns under high speed whirlwind effect.Its it is maximum the disadvantage is that: high-velocity duct air blast is burning
Ceiling portion generates spiral slag line, bottom accumulated powder, makes to dust center and rotation center deviates, cause same section to powder concentration not
, strong influence burning and slagging-off effect.Because dust stratification is serious in burner hearth, can not achieve slag tap.
The burning of coal dust circulation vertical line is to carry out a kind of combustion system of Improvement on the basis of cyclone firing theory.
Such as U.S.'s TRW cyclone burner, divide precombustion chamber and main combustion chamber, equipment is huge, invest and operating cost is high and is not easy a little
Fire；Its principle is: 30-40% coal dust pre-burning low in calories；Wind-warm syndrome from 260-371 DEG C be heated to 1093-1204 DEG C after enter
Main chamber, the coal dust of remaining 60-70% is by the porous penetrating in end, and temperature is up to 980-1900 DEG C.The disadvantage is that: tangent line into
Wind causes combustion chamber to rotate back to flow field distortion so that retention efficiency is difficult to improve；In slag field, high-speed flow generates air inlet
Local Quench causes air port slagging.
Summary of the invention
The technical problem to be solved in the present invention is to provide one kind to give full play to coal dust circulation vertical line combustion energy saving technological merit,
Has the characteristics that the flame generating means safe and environment-friendly, energy saving, the long-term continuous burning such as oilfield gas injection and boiler is suitble to use.
In order to solve the above technical problems, the embodiment provides a kind of generations of coal dust circulation vertical line combustion flame
Device, including flame generating means main body, the flame generating means body interior are formed under upright combustion chamber and the upright combustion chamber of connection
The flame generation cavity in portion, upright combustion chamber top are equipped with crater, and upright bottom of combustion chamber is equipped with slag-drip opening, and the flame occurs
Chamber is connected to First air and coal dust jet pipe, and the position that First air and coal dust jet pipe enter before flame generation cavity is also connected to secondary air channel,
The tertiary-air pipe group of circumferentially tangential direction more than two setting air outlet, all tertiary airs are equipped in the upright combustion chamber
Pipe group is connected to the wind inlet three times above upright combustion chamber.
Further, the flame generating means main body is followed successively by refractory cement layer, water(-cooling) jacket, outside air compartment from inside to outside
Layer.
Wherein, the air compartment outer layer thickness is 200 millimeters, and the water(-cooling) jacket is with a thickness of 100 millimeters, the refractory cement
Layer is with a thickness of 75 millimeters.
Further, the First air and pulverized coal injection bore are 160 millimeters, and the secondary air channel internal diameter is 268 millimeters.
Further, the tertiary-air pipe group shares 4 groups, and every group has 8 air outlets, and the air outlet tilts 8 degree upwards.
Further, the position that First air and coal dust jet pipe are corresponded in the flame generation cavity is equipped with bluff body.
Wherein, the bluff body diameter is 80 millimeters, and bluff body subtended angle is 60 degree.
Further, the slag-drip opening diameter is 200 millimeters.
Technical solution of the present invention has the advantages that；
In above scheme, wind coal mixtures are injected directly into combustion chamber, burn under high speed whirlwind effect.Become horizontal cyclone combustion
Burning is that vertical suspending circulation burns, and cancels precombustion chamber side wall tangent line air inlet, becomes end face blade axial rotational flow to wind.Wind axis
To entrance, Secondary Air coal mixtures are sprayed through end is introduced tangentially into suspension slagging-off chamber, and high speed winds rotation three times is injected；Allow coal dust
Grain can complete circulation suspension combustion from bottom to up in 1-2 seconds.Precombustion chamber and secondary furnace are no longer individually added, burns, remove
Effect that slag, heat supply three are located at one is completed by Multi-function cleaning flame generating means, and pulverized coal flame is fiery close to fuel oil
Torch shape has given full play to the advantage of coal dust circulation vertical line combustion energy saving technology.Flame generating means provided by the invention, using ring
Vertical line combustion technology is flowed, the unsmooth defect of the slagging of horizontal tangent line air inlet, dust stratification, liquid deslagging is eliminated.With safe and environment-friendly, section
The features such as energy, it can be achieved that liquid, dry ash extraction, is suitble to the long-term continuous burning such as oilfield gas injection and boiler to use.
Detailed description of the invention
Fig. 1 is the perspective view of coal dust circulation vertical line combustion flame generator of the invention；
Fig. 2 is the schematic diagram of internal structure of coal dust circulation vertical line combustion flame generator of the invention；
Fig. 3 is the arrangement schematic diagram of the tertiary-air pipe group of coal dust circulation vertical line combustion flame generator of the invention；
Fig. 4 is the working principle diagram of coal dust circulation vertical line combustion flame generator of the invention.
[main element symbol description]
1, upright combustion chamber；
2, flame generation cavity；
3, crater；
4, slag-drip opening；
5, First air and coal dust jet pipe；
6, secondary air channel；
7, tertiary-air pipe group；
8, wind inlet three times；
9, refractory cement layer；
10, water(-cooling) jacket；
11, air compartment outer layer；
12, bluff body；
13, water outlet；
14, vent valve；
15, water valve is checked；
16, into burner；
17, door is observed；
18, tangential swirl piece；
19, adjusting rod；
20, support blade；
21, discharging valve；
22, water inlet；
23, secondary air inlet.
Specific embodiment
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool
Body embodiment is described in detail.
The present invention is for the unsmooth defect of the slagging of current Horizontal burner tangent line air inlet, dust stratification, liquid deslagging and existing
Circulation vertical line burner tangent line air inlet causes combustion chamber to rotate back to flow field distortion so that retention efficiency is difficult to improve；Air inlet in
In slag field, high-speed flow leads to the problem of local Quench and causes air port slagging design.
As shown in Figure 1, Figure 2, Figure 3 shows, coal dust circulation vertical line combustion flame generator, including flame generating means main body, flame
The flame generation cavity 2 of upright combustion chamber 1 and upright 1 lower part of combustion chamber of connection is formed inside generator main body, on upright combustion chamber 1
Portion is equipped with crater 3, and upright 1 bottom of combustion chamber is equipped with slag-drip opening 4, and flame generation cavity 2 is connected to First air and coal dust jet pipe 5, and one
The position that secondary wind and coal dust jet pipe 5 enter before flame generation cavity 2 also be connected to secondary air channel 6, in upright combustion chamber 1 equipped with two groups with
On circumferentially tangential direction setting air outlet tertiary-air pipe group 7, all tertiary-air pipe groups 7 are connected on upright combustion chamber 1
Wind inlet 8 three times of side.
Preferably, flame generating means main body is followed successively by refractory cement layer 9, water(-cooling) jacket 10, air compartment outer layer 11 from inside to outside.
Preferably, the position that First air and coal dust jet pipe 5 are corresponded in flame generation cavity 2 is equipped with bluff body 12.
The above-mentioned basic structure for flame generating means of the present invention can also be specifically arranged according to the conventional design of the industry
The water outlet 13 being located above upright combustion chamber as shown in Figure 2, vent valve 14 check water valve on flame generation cavity
15, into burner 16, door 17 is observed, for the tangential swirl piece 18 that secondary air channel 6 is arranged, adjusting rod 19, support blade 20, Secondary Air
Import 23, and the discharging valve 21 positioned at upright 1 lower section of combustion chamber, water inlet 22.
The working principle of flame generating means of the invention is as shown in Figure 4:
First air the coal dust of 0.03-0.1mm of diameter is sprayed into be sufficiently mixed with Secondary Air, after imperfect combustion tangentially
It is sent into suspension slagging-off chamber, a continuous whole circulation combustion zone vertically upward is formed with high-speed rotating tertiary air, in burning
Heart temperature is up to 1400-1700 DEG C or more, and unique structure ensure that time and the distance of the abundant after-flame of coal dust.In buoyancy and
Under the action of centrifugal force, air is turned to prior to coal dust；Circulation rotating purification movement is made in soot particle decline, flue gas rising, containing a large amount of ashes
The downwelling of slag is thrown to cavity wall entrainment of the fine ash grain of upper rotation together and melts formation about 30mm slag film, 90% coal at high temperature
Ash wanders pond removing in a manner of molten slag.To generate clean high-temperature flue gas, there is apparent auto purification slagging-off effect.
Steady combustion bluff body to be taken, the generation of tempering is effectively prevented, coal dust jet stream changes flow behavior because bypassing bluff body,
Against recirculating zone boundary, there are one layer of concentration height, temperature and the big breeze airflows of velocity gradient, the turbulent flow heat with recirculating zone air-flow
Amount and mass exchange are fierce, thus have easy igniting, the performance of operational safety.
According to above-mentioned principle, specific optimization of working parameters is as follows:
Into and out of the selected of burner and combustion chamber calculation formula and parameter.
If being D into burner diameterInto(m), primary air velocity V1(m/s), crater diameter is DOut(m), Ut- soot particle particle fluid
The tangential velocity (m/s) at a certain moment.Then: Ut(DOut/2)n=V1(D/2)n.V again1=4Qm/(πDInto 2), in formula: Qm- wind coal
Volume of mixture flow (Nm3/ s), D-suspension slagging-off chamber diameter (m).
Under the action of the centrifugal force, fluid resistance must be overcome to soot particle in high-temperature flue gas by moving radially outwards, and work as the two
When equal, soot particle is just with constant speed Vr(m/s) it moves.Thus V is derivedr=UgUt 2/ (gr), in formula: Ug- spherical shape soot particle (furnace
Slag) floating velocity (5-17.7m/s of value range), r-soot particle particle movement radius of a circle (m).
He=(2/3) { (D-dFlow slag2tan)/[(α/2)] }, in formula: slag flow port diameter dFlow slag=0.04-0.28D (stream slag
Take large values dFlow slag=0.28D)；Angulus pyramidis α=30 °；Then He≈ 0.9D, D ≈ 5Qm 1/3。
The actual diameter of suspension slagging-off chamber are as follows: D ≈ (0.12-0.25) B1/3；Suspension slagging-off chamber height are as follows: L=(1-2)
D generally takes L=2D.
Into burner diameter are as follows: DInto=0.45D；Enter and under horizontal alignment into burner along the tangent line of suspension slagging-off chamber
Pulverized coal injection fuel efficiency fruit is best when tilt angle is 5 ° -20 °, tilt angle is 15 ° at that time, length LInto=1-1.4D, generally
Take LInto=D.
Crater diameter are as follows: DOut=1.3DInto>=0.6m, crater length LOut=0.25-0.45m, takes LOut=0.3m.
Pulverized coal particle is in the total distance [S to be passed by into burner and suspension slagging-off chamberz=LInto+ π Dn, n-coal dust rotation circle
Number] have to be larger than Sz=14m is just completely burned off.
Bluff body and one, two, three air hose calculation formula and parameter it is selected.
Bluff body outer diameter: d0=m { 4 (A1+A2)/[π (1-m2)] } 1/2；The actual diameter of bluff body are as follows:
d0≈0.0035B 1/2。
Primary air piping internal diameter: d1=2d0；Primary air piping uses seamless steel pipe, junction rounding off, elbow or angle
Centainly >=120 °, control valve uses butterfly valve.
Secondary air channel internal diameter: d2=(d12+4A1/ π) 1/2, the actual diameter of secondary air channel are as follows: d2 ≈ 0.012B 1/2.
Secondary air channel wimble fraction length generally takes 0.15-0.3m.
Commutate accelerating region circulation high speed whirlwind tertiary-air pipe internal diameter: d3 ≈ 0.005 (B/Z) 1/2, Z-tertiary-air pipe quantity
(generally every row's number n=5-15, the row of number of rows m=3-5), tertiary-air pipe diameter generally chooses 20mm-40mm, to prevent
Only air port is excessive causes local Quench slagging.Tertiary air always enters the wind bore: d is total=[4Bvn β 3/ (3600 π u3)] 1/2 ≈
0.006B1/2。
The parameters such as air inlet fan and air-introduced machine, water pump are selected.
The type selecting of air inlet fan and air-introduced machine, cooling circulating water pump (centrifugal pipe pump): fan delivery Q is entered the wind into=1.2Bvn (N
M3/h), total pressure 4000Pa or more；Air-introduced machine absorbing quantity Q draws=1.5Bkg/h × 10m3/kg=15B (N m3/h)；Water pump always flows
Q water (m3/h)=3600 μ A water (2gh water) 1/2 is measured, A water-water flow section product (m2), h water-lift (mH2O), stream in formula
Coefficient of discharge μ=0.6, water inlet flow velocity generally take 2m/s.
Air compartment is with a thickness of δ 3=200mm；Water-cooled jacket is with a thickness of δ 2=100mm；General refractory cement is with a thickness of δ 1=75mm；
Slag-drip opening can not too greatly (excessive with heat loss prevention), and a diameter of d row=200mm is advisable.
By taking 500kg/h Multi-function cleaning flame generating means as an example, final parameter selection is as follows:
(1) suspension slagging-off chamber diameter: D ≈ (0.12-0.25) B1/3 (B=500kg/h) takes D=1200mm；Height L=
2D=2400mm.Coal dust rotating cycle n >=4 (4 row of tertiary-air pipe)；Then Sz=L is into Dn=1.2+3.14 × 1.2+π × 4 ≈ 16m
>=14m meets completely burned off condition.
(2) into burner diameter: D is into=0.45D ≈ 0.5m=500mm；Length L is into=D=1200mm；It dips down into burner
Rake angle is 15 °.
(3) crater diameter: D goes out=and 1.3D into >=0.6m, D goes out ≈ 0.65m=650mm；Length L goes out=300mm.
(4) bluff body diameter: the d0 ≈ 0.0035B ≈ of 1/2=0.0035 × 500 1/2 0.08m=80mm；Bluff body subtended angle is
60 °, take height h=2d0=160mm, spinning disk inclination angle is 35 °.
(5) primary air piping internal diameter: d1=2d0=160mm；Primary air ratio β 1=10%, primary air velocity u1=20m/s.
(6) secondary air channel diameter: 1/2 ≈ 0.268m of d2 ≈ 0.012B, selecting outer diameter is 299mm, wall thickness 16mm seamless steel pipe
Internal diameter be d2=267mm；Take funnel portion length 0.2m；Secondary air ratio β 1=20%, secondary wind speed u1=30m/s.
(7) tertiary-air pipe diameter: d3 ≈ 0.005 (B/Z) 1/2 takes tertiary-air pipe number Z=32 (number of rows m=4, every row's number
N=8), then d3 ≈ 0.02m,；Selecting outer diameter is 35mm, the internal diameter of wall thickness 6mm seamless steel pipe is d3=22mm；Tertiary air rate β 1
=70%, tertiary-air velocity u1=50m/s.
(8) air compartment thickness: δ 3=200mm；Water-cooled jacket thickness: δ 2=100mm；Refractory cement thickness: δ 1=75mm；Steel plate
Thickness: δ=14mm；Slag-drip opening diameter: d arranges=0.04-0.28D, takes d row=200mm.
(9) suspension slagging-off chamber (i.e. upright combustion chamber) length of run design calculates
Suspension slagging-off chamber (including refractory cement) internal diameter is R0=D/2=600mm；Water-cooled jacket internal diameter is R1=D/2+ δ 1=
600+75=675mm, water-cooled jacket outer diameter are R2=D/2+ δ 1+ δ 2=675+100=775mm；Cos α=(R0-d3/2)/R1=
29.2 ° of (600-22/2)/675 ≈ 0.8726, α ≈；Cos β=(R0-d3/2)/R2=(600-22/2)/775 ≈ 0.76, β ≈
40.5°。
Rotation angle γ value calculates: sin γ=(R0-d goes out/2)/R2=(600-650/2)/775 ≈ 0.3548, γ ≈
20.8°.Orientation angle κ value calculates: cos κ 1=[R0-d into/2]/R1=(600-500/2)/675 ≈ 0.5185,58.8 ° of 1 ≈ of κ；
Cos κ 2=(R0-d into/2)/R2=(600-500/2)/775 ≈ 0.4516,63.2 ° of 2 ≈ of κ.
Be unfolded along 45 ° of line AA1, then: arc length AB=(+45 ° of β-α+γ) π R1/180 °=(40.5 ° -29.2 °+20.8 °+
45°)×3.14×675/180°≈908mm；π R2/180 °=(20.8 °+45 °) × 3.14 arc length A1B1=(+45 ° of γ) ×
775/180°≈890mm.Into and out of burner center line arc length distance B1B2=(+90 ° of+κ of γ 2) π R2/180 °=(20.8 °+90 °+
63.2°)×3.14×775/180°≈2352mm.In centerline height distance L=L-D goes out/tan15 ° of 2- (D into/2)=
2400-650/2-(500/2)≈1825mm。
Water cooling inner and outer sleeves length of run calculates: R1=2 × 3.14 b1=2 π × 675 ≈ 4239mm, b2=2 π R2=2 ×
3.14×775≈4867mm；Water cooling inner and outer sleeves expansion height calculates: height L opens up 1=L+2 δ 1=2400+2 × 75=
2550mm, height L open up 2=L+2 (δ 1+ δ 1)=2400+2 × (75+100)=2750mm；Two air hose spacing (arcs of circumferencial direction
It is long) c1=b1/n=4239/8 ≈ 530mm, c2=b2/n=4867/8 ≈ 608mm.Water-cooled jacket is along two air hose phases of short transverse
Compartment is away from: e=[L-2a1- (D goes out+δ 1+ δ 2)-(D into+δ 1+ δ 2)]/(m-1)=2400-2 × 100- (650+75+100)-
(500+75+100)/(4-1)≈233mm；A2=a1+ δ 2tan θ=100+100 × tan8 ° of ≈ 114mm.
It is the preferred embodiment of the present invention above, it is noted that for those skilled in the art,
Various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should be regarded as this
The protection scope of invention.
Claims (1)
1. a kind of coal dust circulation vertical line combustion flame generator, including flame generating means main body, which is characterized in that the flame hair
Raw device body interior forms the flame generation cavity of upright combustion chamber and the upright combustion chamber lower part of connection, and upright combustion chamber top is equipped with
Crater, upright bottom of combustion chamber are equipped with slag-drip opening, the flame generation cavity connection First air and coal dust jet pipe, First air and coal
The position that powder jet pipe enters before flame generation cavity is also connected to secondary air channel, be equipped in the upright combustion chamber it is more than two circumferentially
Tangential direction be arranged air outlet tertiary-air pipe group, all tertiary-air pipe groups be connected to the tertiary air above upright combustion chamber into
Mouthful；
The flame generating means main body is followed successively by refractory cement layer, water(-cooling) jacket, air compartment outer layer from inside to outside；
The air compartment outer layer thickness be 200 millimeters, the water(-cooling) jacket with a thickness of 100 millimeters, the refractory cement layer with a thickness of
75 millimeters；
The First air and pulverized coal injection bore are 160 millimeters, and the secondary air channel internal diameter is 268 millimeters；
The tertiary-air pipe group shares 4 groups, and every group has 8 air outlets, and the air outlet tilts 8 degree upwards；
The position that First air and coal dust jet pipe are corresponded in the flame generation cavity is equipped with bluff body；
The bluff body diameter is 80 millimeters, and bluff body subtended angle is 60 degree；
The slag-drip opening diameter is 200 millimeters.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611034793.4A CN106765074B (en) | 2016-11-09 | 2016-11-09 | A kind of coal dust circulation vertical line combustion flame generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611034793.4A CN106765074B (en) | 2016-11-09 | 2016-11-09 | A kind of coal dust circulation vertical line combustion flame generator |
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| CN106765074A CN106765074A (en) | 2017-05-31 |
| CN106765074B true CN106765074B (en) | 2018-12-14 |
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| JP2007225228A (en) * | 2006-02-24 | 2007-09-06 | Mitsubishi Heavy Ind Ltd | Pulverized fuel burning burner, pulverized fuel combustion device, and burning method for pulverized fuel |
| CN101963352A (en) * | 2010-10-25 | 2011-02-02 | 南京航空航天大学 | Double rotational flow powdered coal burner |
| CN102022726A (en) * | 2010-12-31 | 2011-04-20 | 黄官禹 | Clean burner for pulverized coal |
| CN102494340A (en) * | 2011-12-16 | 2012-06-13 | 哈尔滨工业大学 | Pulverized coal high-temperature oxygen ignition method and device |
| CN103807851A (en) * | 2014-01-24 | 2014-05-21 | 李延新 | Pulverized coal gasification coke-removing burner |
-
2016
- 2016-11-09 CN CN201611034793.4A patent/CN106765074B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007225228A (en) * | 2006-02-24 | 2007-09-06 | Mitsubishi Heavy Ind Ltd | Pulverized fuel burning burner, pulverized fuel combustion device, and burning method for pulverized fuel |
| CN101963352A (en) * | 2010-10-25 | 2011-02-02 | 南京航空航天大学 | Double rotational flow powdered coal burner |
| CN102022726A (en) * | 2010-12-31 | 2011-04-20 | 黄官禹 | Clean burner for pulverized coal |
| CN102494340A (en) * | 2011-12-16 | 2012-06-13 | 哈尔滨工业大学 | Pulverized coal high-temperature oxygen ignition method and device |
| CN103807851A (en) * | 2014-01-24 | 2014-05-21 | 李延新 | Pulverized coal gasification coke-removing burner |
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