CN109022673A - A kind of converter secondary flue gas capturing device of combination air curtain - Google Patents
A kind of converter secondary flue gas capturing device of combination air curtain Download PDFInfo
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- CN109022673A CN109022673A CN201811065807.8A CN201811065807A CN109022673A CN 109022673 A CN109022673 A CN 109022673A CN 201811065807 A CN201811065807 A CN 201811065807A CN 109022673 A CN109022673 A CN 109022673A
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- gathering arrester
- flue gas
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
- C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
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Abstract
The invention discloses a kind of converter secondary flue gas capturing devices of combination air curtain, including the multiple air outlets and air hose for being located at dust gathering arrester above converter and tank switching, being distributed on the dust gathering arrester, the dust gathering arrester include perpendicular to ground setting front apron and with front apron rear baffle disposed in parallel, it is connected with top plate on the top of the front apron and rear baffle, multiple air outlets are distributed on the front apron of the dust gathering arrester in arc-shaped；Secondary flue gas capturing device provided by the invention intercepts pollutant using Jet Flow Field, acts on after the jet stream of volume suction pollutant with rising flue gas and air draft three, forms a trapping whirlpool, improves cover mouth edge trapping flue gas effect.
Description
Technical field
The present invention relates to converter secondary flue gas capturing devices, and in particular to a kind of converter secondary flue gas trapping of combination air curtain
Device.
Background technique
Pneumatic steelmaking is using molten iron, steel scrap, ferroalloy as primary raw material, not by external energy, by the object of iron liquid itself
Chemical reaction between reason heat and iron liquid component generates heat and completes steelmaking process in converter.But converter is into molten iron, smelting
Volume of smoke is generated during refining, tapping, direct emission is collected if be not added by adverse condition and pollutes.Original converter
Secondary flue gas capturing device has that exhaust air rate is big, and pollutant is difficult to control, and traps effect for a large amount of high-temperature particle objects that converter generates
Fruit is bad, causes in workshop pollutant to diffuse and is finally discharged into environment.It is found by field research and test, a large amount of flue gas
It escapes from cover mouth edge, how to reduce exhaust hood mouth edge flue gas escape amount is the key that reduce to improve arresting efficiency.The design
Original secondary flue gas capturing device is exactly improved, flue dust and noxious gas emission is reduced into environment, improves catching for pollutant
Collect efficiency, while reducing the energy consumption of trapping, achievees the purpose that efficiently to trap.
The strategy about the capturing device of converter secondary flue gas is divided into following three classes at present:
1. increasing irony baffle or curtain in cover mouth, flue gas is diffused into environment when for stopping to topple over.It does so preceding
The effect that phase has comparison pretty good, but under high-temperature flue gas and particulate matter long term, baffle and curtain are ineffective, it cannot be long-term
Effective control flue dust diffusion.
2. expanding the cross-sectional area of cover mouth.A large amount of flue gases can be trapped in toppling process.But it under this cover, reaches
To under original system identical cover one's intention as revealed in what one says speed, can increase blower at double energy consumption, while sucking a large amount of wild wind and not energy-efficient.
3. using number trapping three times or more.This Trapping ways can reduce pollutant and be diffused into external environment, but
It is that control workshop internal environment is bad, furthermore a large amount of pollutants are mixed with room air, increase post-processing difficulty, are sucked a large amount of wild
Wind is simultaneously not energy-efficient.
To sum up, the arresting efficiency of the capturing device of existing converter secondary flue gas is low and reduces trapping energy consumption height.
Summary of the invention
It is existing to solve the purpose of the present invention is to provide a kind of converter secondary flue gas capturing device of combination air curtain
The problems such as arresting efficiency of the capturing device of converter secondary flue gas is low.
In order to realize above-mentioned task, the invention adopts the following technical scheme:
A kind of converter secondary flue gas capturing device of combination air curtain, including being located at the dust gathering arrester above converter and tank switching, institute
The dust gathering arrester stated includes front apron and top plate, and multiple air outlets, the dust are distributed on the front apron of the dust gathering arrester
Cover both ends are connected separately with two sections of air hoses, which is characterized in that the dust gathering arrester further includes disposed in parallel with the front apron
Rear baffle, the front apron, top plate and rear baffle are sequentially connected with to form the hollow groove body that a lower section has opening；
Air-supply interlayer and air draft interlayer, the air-supply interlayer are internally provided in the hollow groove body of the dust gathering arrester
And air draft interlayer is arranged each along the length direction of the dust gathering arrester, the opening is located at the lower section of the air draft interlayer；
The air outlet is connected to the air-supply interlayer, front of multiple air outlets in the dust gathering arrester
It is distributed on plate in arc-shaped；
The air hose includes air supply tube and air-exhausting duct, and the air supply tube is connected to the air-supply interlayer, described
Air-exhausting duct be connected to the air draft interlayer；
The converter secondary flue gas capturing device further includes high-pressure blowing-in mechanism and air draft mechanism, the high-pressure blowing-in
Mechanism is connected to the air supply tube, and the air draft mechanism is connected to the air-exhausting duct.
Further, when on the front apron being in arc-shaped distribution, the circular arc is multiple air outlets
Radius is on 8.6 meters of circle, when central angle is 60 degree pair circular arc, and the center of circle is located at the lower section of dust gathering arrester.
Further, offer curved opening on the front apron of the dust gathering arrester, the shape of the curved opening with
Distribution shape of the air outlet on front apron is identical, and the air outlet is distributed in the curved opening of the front apron.
Further, the air outlet stretches out the front apron and the air outlet and the dust gathering arrester of the dust gathering arrester
Front apron between have greater than 90 degree of angle.
Further, the angle between the air outlet and the front apron of the dust gathering arrester is 135 degree.
Further, the air hose is integrally formed, and is internally provided with air supply tube and air-exhausting duct in the air hose,
The air supply tube and air-exhausting duct is arranged each along the length direction of air hose.
Further, the area of the air supply tube cross section in the air hose and the area ratio of air-exhausting duct cross section are full
Sufficient Formulas I:
Wherein, SPFor air-exhausting duct cross-sectional area, unit m2, SSFor air supply tube cross-sectional area, unit m2, QPFor row
Air draft air quantity in air hose, unit m3/ s, QSFor air-supply air quantity in air supply tube, unit m3/ s, ξsFor air supply tube pressure loss system
Number, ξpFor air-exhausting duct pressure drop coefficient, ξs>0,ξp>0。
Further, it is provided with flame retardant coating on the inner wall of the air-exhausting duct, is provided on the inside of the dust gathering arrester resistance to
Fire bed.
Further, the plenum chamber that the high-pressure blowing-in mechanism includes pressure fan and connect with pressure fan, it is described
Plenum chamber is connected to the air supply tube.
The present invention has following technical characterstic compared with prior art:
1, converter secondary flue gas capturing device provided by the invention utilizes arc air curtain combination dust gathering arrester rear baffle, forms one
A trapping whirlpool improves the flue gas trapping effect of dust gathering arrester open edge；And air curtain blocks the smoke movement moved upwards,
Partial fume is set to change direction, the decline of particulate matter movement velocity is just successfully trapped by dust gathering arrester；
2, converter secondary flue gas capturing device provided by the invention compares pipeline section product according to air quantity and is allocated, and avoids
The problem of air supply tube and air-exhausting duct cause local resistance excessive, finally result in fan energy consumption rising because wind speed is too fast appearance,
Reduce the energy consumption of capturing device；
3, air supply tube and air-exhausting duct are connected in parallel by converter secondary flue gas capturing device provided by the invention, utilize air-supply
The flue-gas temperature of air draft is reduced, so that the density of air draft rises, the quality of specific volume decline, discharge unit volume flue gas rises,
The energy consumption of capturing device is saved.
Detailed description of the invention
Fig. 1 is the converter secondary flue gas capturing device overall structure front view provided in one embodiment of the present of invention；
Fig. 2 is the converter secondary flue gas capturing device overall structure side view provided in one embodiment of the present of invention；
Fig. 3 is the converter secondary flue gas capturing device overall structure diagram provided in one embodiment of the present of invention；
Fig. 4 is the dust gathering arrester front view provided in one embodiment of the present of invention；
Fig. 5 is the dust gathering arrester side view provided in one embodiment of the present of invention；
Fig. 6 is the air hose side view provided in one embodiment of the present of invention；
Fig. 7 is the particulate matter residence time effect picture of existing secondary flue gas capturing device；
Fig. 8 is the particulate matter residence time effect picture of capturing device provided by the invention；
Fig. 9 is the static pressure cloud atlas of dust gathering arrester central cross-section in existing secondary flue gas capturing device；
Figure 10 is the static pressure cloud atlas of dust gathering arrester central cross-section in capturing device provided by the invention.
Figure label represents: 1- dust gathering arrester, 2- air outlet, 3- air hose, 4- high-pressure blowing-in mechanism, 5- air draft mechanism, and 6- turns
Furnace, 7- tank switching, 8- tank switching frame, 11- front apron, 12- rear baffle, 13- top plate, 14- air-supply interlayer, 15- air draft interlayer, 31- are sent
Air hose, 32- air-exhausting duct.
Specific embodiment
It is the specific embodiment that inventor provides below, to be further explained explanation to technical solution of the present invention.
Embodiment one
Present embodiment discloses a kind of converter secondary flue gas capturing devices of combination air curtain, including are located at converter 6 and tank switching 7
The dust gathering arrester 1 of top, the dust gathering arrester 1 include front apron 11 and top plate 13, are distributed on the front apron 11 of the dust gathering arrester 1
There are multiple air outlets 2,1 both ends of dust gathering arrester are connected separately with two sections of air hoses 3, which is characterized in that the dust gathering arrester 1 is also
Including with the front apron 11 rear baffle 12 disposed in parallel, the front apron 11, top plate 13 and rear baffle 12 are sequentially connected with shape
There is the hollow groove body of opening at a lower section；
Air-supply interlayer 14 and air draft interlayer 15 is internally provided in the hollow groove body of the dust gathering arrester 1, and described send
Wind interlayer 14 and air draft interlayer 15 are arranged each along the length direction of the dust gathering arrester 1, and the opening is located at the air draft
The lower section of interlayer 15；
The air outlet 2 is connected to the air-supply interlayer 14, and multiple air outlets 2 are in the dust gathering arrester 1
Front apron 11 in arc-shaped be distributed；
The air hose 3 includes air supply tube 31 and air-exhausting duct 32, the air supply tube 31 and the air-supply interlayer 14
Connection, the air-exhausting duct 32 are connected to the air draft interlayer 15；
The converter secondary flue gas capturing device further includes high-pressure blowing-in mechanism 4 and air draft mechanism 5, the high force feed
Blower structure 4 is connected to the air supply tube 31, and the air draft mechanism 5 is connected to the air-exhausting duct 32.
As shown in Figure 1, 2, the converter secondary flue gas capturing device provided in the present embodiment, in existing converter secondary fume
Dust gathering arrester is improved on the basis of gas capturing device, is mainly used for the secondary flue gas at work by converter 6 and tank switching 7
It is collected, wherein tank switching 7 is lifted using tank switching frame 8, and original dust gathering arrester only includes front apron and top plate, in the present embodiment
In, dust gathering arrester 1 includes front apron 11, rear baffle 12 and top plate 13, and the hollow groove body of dust gathering arrester 1 is interior to be separated by two with baffle
Interlayer, one is for blowing to the air-supply interlayer 14 of air outlet 2, the other is for sucking secondary flue gas in air hose 3
Air draft interlayer 15, the opening of dust gathering arrester 1 are located at the lower section of air draft interlayer 15；
It also sets up air outlet 2 in the present embodiment to be distributed on the front apron 11 of dust gathering arrester 1 in arc-shaped, interlayer of in addition blowing
14 are arranged along the length direction of dust gathering arrester 1, provide wind-force for air outlet 2, i.e., increase one in front of the opening of dust gathering arrester 1
The air curtain of road arc-shaped, arc-shaped air curtain and rear baffle constitute a smoking headroom, and converter 6 and tank switching 7 are enclosed in suction
In smoke space, and the suction wind-force for cooperating air draft mechanism 5 to provide, so that 1 opening of dust gathering arrester forms negative pressure, it will be secondary
Flue gas is discharged, such setting is enhanced by collecting behind the entrance of air draft interlayer 14 sucking 1 inside of dust gathering arrester by air-exhausting duct 32
The pressure of 1 opening of dust hood is distributed, so that negative pressure is in the lower section of 1 opening of dust gathering arrester, improves the trapping of converter secondary flue gas
The suction force of device improves the efficiency of flue gas trapping.
It is distributed on the front apron 11 of the dust gathering arrester 1 in arc-shaped in addition, being provided with multiple air outlets 2,
These air outlets 2 are connected to air-supply interlayer 14 and air supply tube 31, that is to say, that the high-pressure blast that high-pressure blowing-in device 4 provides
Power is transmitted at air outlet 2 by air supply tube 31 and air-supply interlayer 14, then is discharged by air outlet 2, and arc-shaped is formd
Air curtain, the air curtain of arc-shaped make air-flow be changed to the direction of spiral, the flue gas of escape can be involved in dust gathering arrester 1, improved
The efficiency of flue gas trapping.
There are also the air curtains of jet stream to block the smoke movement moved upwards, and partial fume is made to change direction, particulate matter fortune
Dynamic speed decline, could successfully be trapped by dust gathering arrester.
Rear baffle 12, which can be rectangle, arc etc., to be cooperated with arc air curtain, and the shape of smoking headroom is formed, as
A kind of preferred embodiment, rear baffle 12 are also provided with into arc-shaped, which cooperatively forms the smoking of a tubular with air curtain
Headroom, i.e. it is being in when arc-shaped is distributed on the front apron 11 that the circular shape of rear baffle 12, which is with multiple air outlets 2,
Circular arc is that middle line is symmetrically arranged, and in order to increase the height of smoking headroom, improves arresting efficiency, rear gear with front apron 11
Distance of the plate 12 apart from ground is less than distance of the front apron 11 apart from ground.
Front apron in 2 downside of air outlet is brushed using refractory material, avoids corroding because of high temperature.
Optionally, air outlet 2 can be circular spout, be also possible to louvered, as a preferred embodiment, adopting
With the louvered of fine-tuning angle.
In the present embodiment, length transfers 1 meter to rear baffle 12 down, and the length of front apron 11 and rear baffle 12 is 5m.
Two sections of air hoses 3 of capturing device are connected to the both ends of dust gathering arrester 1, and the other end of each air hose is connected with high pressure
The other end of two sections of air hoses 3 is connected together by wind pushing mechanism 4 and air draft mechanism 5, and two sections of air hoses 3 share a high force feed
Blower structure 4 and air draft mechanism 5.As shown in figure 3, two sections of air hoses 3 are connected to the both ends of dust gathering arrester 1, two sections of air hoses it is another
End is interconnected, i.e. air supply tube 31 in two sections of air hoses 3 is interconnected, and air-exhausting duct 32 is interconnected, and air supply tube 31 is interconnected
It is connected to again with high-pressure blowing-in mechanism 4 afterwards, air-exhausting duct 32 is connected to air draft mechanism 5 again after being interconnected.
As shown in figure 3, the shape of capturing device can be arranged as the case may be, such as dust gathering arrester 1 and air hose 3 can pacify
On the ceiling of converter workshop, it is also possible to dust gathering arrester 1 and is mounted on the ceiling of converter workshop, a part of air hose 3
It may be mounted on ceiling, another part is laid on the ground.
As a preferred embodiment, multiple air outlets 2 are on the front apron 11 in arc-shaped point
When cloth, the circular arc is on the circle that radius is 8.6 meters, when central angle is 60 ° pair circular arc, and the center of circle is located at dust gathering arrester 1
Lower section.
In the present embodiment, as shown in figure 4, giving a kind of preferred circular shape, which is that central angle is
The corresponding arc in 60 degree of angle, the circle meet x2+y2=8.62, unit m.
Above arrangement be according to the size of converter mill, the height of transport channel, the height on ground distance roof and
The comprehensive acquisition such as diameter of converter.
Optionally, offer curved opening on the front apron 11 of the dust gathering arrester 1, the shape of the curved opening with
Distribution shape of the air outlet 2 on front apron 11 is identical, and the air outlet 2 divides along the curved opening of the front apron 11
Cloth.
As shown in figure 4, to keep the air curtain shape of the ejection of air outlet 2 more complete and avoiding front apron 11 rotten due to high temperature
Erosion, in the present embodiment that front apron 11 is shaped to air outlet 2 is distributed arc is consistent, the i.e. opening of front apron 11
For arc, that is to say, that air outlet 2 is arranged along the curved opening of front apron 11, and the distribution shape of air outlet 2 is namely at this time
Arc.
Optionally, the air outlet 2 stretches out the front apron 11 and the air outlet 2 and the collection of the dust gathering arrester 1
There is the angle greater than 90 degree between the front apron 11 of dust hood 1.
In the present embodiment, as shown in figure 5, to expand the range of smoking headroom, air outlet 2 stretches out front apron 11, is
The stability for guaranteeing smoking headroom stroke makes the angle for having greater than 90 degree between air outlet 2 and front apron 11.
As a preferred embodiment, the angle between the front apron 11 of the air outlet 2 and the dust gathering arrester 1
It is 135 degree.
In the present embodiment, air outlet 2 is towards 45 degree downward of horizontal direction, air outlet 2 and the directly company of welding of front apron 11
It connects.
Optionally, the air hose 3 is integrally formed, and is internally provided with air supply tube 31 and air draft in the air hose 3
Pipe 32, the air supply tube 31 and air-exhausting duct 32 are arranged each along the length direction of air hose.
To save cost, as shown in fig. 6, air supply tube 31 and air-exhausting duct 32 are integrated in same root air hose 3, interlayer is utilized
Air hose is separated, so that an air hose becomes dual-purpose air hose.Air supply tube 31 and air-exhausting duct 32 are connected in parallel, air-supply is utilized
The flue-gas temperature of air draft is reduced, so that the density of air draft rises, the quality of specific volume decline, discharge unit volume flue gas rises,
Fan energy consumption has been saved from another angle.
Optionally, the area ratio of the area of 31 cross section of air supply tube in the air hose 3 and 32 cross section of air-exhausting duct
Example meets Formulas I:
Wherein, SPFor air-exhausting duct cross-sectional area, unit m2, SSFor air supply tube cross-sectional area, unit m2, QPFor row
Air draft air quantity in air hose, unit m3/ s, QSFor air supply tube air-supply air quantity, unit m3/ s, ξsFor air supply duct pressure loss system
Number, ξpFor air-exhausting duct pressure drop coefficient, ξs>0,ξp>0。
Preferably,Design recommendation value takes 2~2.5.
Pipeline section product is compared according to air quantity to be allocated, and air supply tube and air-exhausting duct is avoided to cause office because wind speed is too fast
Portion's resistance is excessive, finally results in fan energy consumption rising.
Optionally, it is provided with flame retardant coating on the inner wall of the air-exhausting duct 32, in the rear baffle 12 of the dust gathering arrester 1
Side is provided with flame retardant coating.
To prevent high temperature corrosion of the flue gas to 32 inside of air-exhausting duct and 1 rear baffle 12 of dust gathering arrester, in air-exhausting duct 32
It is provided with flame retardant coating on wall, the inside of the rear baffle 12 of dust gathering arrester 1 is provided with flame retardant coating.
Optionally, the high-pressure blowing-in mechanism 4 includes pressure fan and the plenum chamber connecting with pressure fan, and described is quiet
Case is pressed to be connected to connection with the air supply tube 31.
In order to provide high wind power, high-pressure blowing-in mechanism 4 includes for providing the pressure fan of air-supply power, and for mentioning
For the plenum chamber of high pressure, the wind sent out by pressure fan forms the transport of high wind power air supply tube 31 to out after plenum chamber pressurizes
Air port 2.
The converter secondary flue gas capturing device of combination air curtain provided by the invention, the device increase one in gate cover mouth
Air curtain jet stream has changed the size of original exhaust hood, while increasing lower baffle plate close to the side of kennel increasing gate cover.Dress
Contaminant trapping can more efficiently be carried out than original device by setting, first is that, jet stream blocks the smoke movement moved upwards, makes
Partial fume changes direction, the decline of particulate matter movement velocity, after successfully trapped by dust gathering arrester.Second is that forming trapping whirlpool, change
Exhaust hood edge airflow situation, the capturing device intercept pollutant using Jet Flow Field, volume inhale after the jet stream of pollutant with rising
Flue gas and air draft three effect, form a trapping whirlpool, improve cover mouth edge and trap flue gas effect.
Embodiment two
The experimental verification for present embodiments providing the secondary flue gas capturing device in embodiment one, uses in the present embodiment
CFD numerical simulation carries out hydromechanical test.For the numerical simulation calculation of Dual-Phrase Distribution of Gas olid, the present embodiment using from
Dephasing model (DPM), what DPM was followed is Eulerian-Lagrangian Method, from the particle of fluid, tracks each fluid particle
Movement it is whole, record the variation of particle each physical quantity state at each moment, each position.In Fluent, glug
The fluid for accounting for main component is considered as continuous phase by Lang Fa, and sparse phase is seen as discrete particle.Mainstream mutually uses Euler method, and
Discrete phase is then tracked particle using Lagrangian method.The restrictive condition of this method is that the volume fraction of discrete phase cannot be high
In 10~12%.Complicated work between DPM model analysis particle that can be careful and intergranular active force and particle and fluid
Firmly, the setting condition in the present embodiment about DPM is listed in table 1.
The specific item being arranged in 1 DPM of table
| Set content | The method of use |
| The model that gas-particle two-phase flow field simulation is chosen | Discrete Phase Model (DPM) |
| The interaction of continuous phase and discrete phase | Unidirectional couplings only consider effect of the continuous phase to discrete phase |
| The DIFFUSION IN TURBULENCE of particulate matter uses model | Stochastic Separated Flow Model (Stochastic Tracking Model) |
| Air instantaneous velocity model | Discrete type random walk (DRW) model |
| Calculate the active force that the particulate matter being related to is subject to | Gravity, thermophoretic forces, brown force, Saffman power |
In the present embodiment, it is long 30m* wide 30m* high 39m that experimental enviroment, which is the size of converter mill, wherein transport channel
A height of 9m, stand a height of 30m in people's ground distance roof, and the diameter of converter is 6m, and the diameter of tank switching is 4m.
In the present embodiment, by secondary flue gas capturing device provided by the invention and existing secondary flue gas capturing device
Trapping effect compares, and the boundary condition of existing capturing device is shown in Table 1, the boundary condition of capturing device provided by the invention
It is shown in Table 2.
The simulating boundary condition of the existing capturing device of table 2
| Boundary types | In detail | |
| Dust gathering arrester | Speed outlet | 25m/s |
| Converter | Speed entrance | 4.0m/s(803K) |
| Transport vehicle passway | Pressure entrance | Relative pressure is 5pa |
| Computational domain both sides opening | Pressure entrance | Relative pressure is 0 |
| Other | Wall | Determine wall temperature (300K) |
The simulating boundary condition of the capturing device provided by the invention of table 3
| Boundary types | In detail | |
| Dust gathering arrester | Speed outlet | 25m/s |
| Air outlet | Speed entrance | 10m/s |
| Converter | Speed entrance | 4.0m/s(803K) |
| Transport vehicle passway | Pressure entrance | Relative pressure is 5pa |
| Computational domain both sides opening | Pressure entrance | Relative pressure is 0 |
| Other | Wall | Determine wall temperature (300K) |
Wherein, the jet direction of air outlet and vertical direction are in 20 ° of angles, and boundary condition is more accurate, the two be arranged from
The method of dephasing is the same.Wall jet is created in injections, converter discharge surface is jet source (i.e. pollutant), and direction is vertical
It is outside in jet surface.According to actual measured results, mass percent shared by the dust particles of different-grain diameter range is imported
Rosin-rammler function, the rosin-rammler Distribution Value for acquiring coincidence measurement result (obtain profile exponent n and average grain
Diameter d).Minimum grain size is 5m, maximum particle diameter 50m.Particle effect is set as trapping at enclosure mouth and pressure entrance, filler
Tank and kennel outside wall surface are set as reflecting to particle effect, remaining boundary face is escape to particle.
By particle in flow field residence time cloud atlas, as Figure 7-8, it qualitative can find out before transformation there is a large amount of particles
It overflows, wherein Fig. 7 is the particulate matter residence time effect picture of existing secondary flue gas capturing device, and Fig. 8 is provided by the invention
The particulate matter residence time effect picture of capturing device, compares by quantitative result.It is 11360 that original system converter, which discharges particle,
It is a, wherein 9148 are captured, capture rate 80.5%；Improved system converter release particle is 37760, wherein trapping
37758, capture rate 99.99%, it can be seen that the formation of air curtain contributes positively to the capture of particulate matter.Block particle
It diffuses up.There is isolation particle to diffuse up.
Cover open area is foreshortened to 5*2m having a size of 7.8m*2m, by being transformed by original cover mouth.Same 25m/s's
Under wind speed, originally the air quantity of cover mouth covers the big 140m3/s of mouthful suction air volume than originally, for the sectional dimension in increased jet stream air port
For 5m*0.4m, in the case where jet stream wind speed is the speed of 10m/s, amount of jet 20m3/s.In general, the air quantity of blower offer is
Decline, under the premise of effectively control pollutant, accomplishes reduction air quantity, reduced the effect of energy consumption.
The static pressure difference that the exhaust hood of front and back is transformed is quite big, is exhaust hood center in Fig. 9 and Figure 10 as shown in figs. 9-10
Sectional pressure cloud atlas, transverse and longitudinal coordinate are spatial position, and numerical value is relative pressure on isobar in figure.As seen from Figure 9, due to
The cover mouth negative pressure of original exhaust hood is inadequate, and sphere of action is not wide enough, and many particles is caused just to escape out being less than exhaust hood mouth
It goes.As seen from Figure 10, by adding baffle and increasing air curtain jet orifice, the negative pressure for strengthening exhaust hood mouth edge is distributed,
Further expansion pressure sphere of action simultaneously, is effectively increased the capturing ability to particle.
Claims (9)
1. the converter secondary flue gas capturing device of a kind of combination air curtain, including being located at the dust gathering arrester above converter (6) and tank switching (7)
(1), the dust gathering arrester (1) includes front apron (11) and top plate (13), is distributed on the front apron (11) of the dust gathering arrester (1)
Have multiple air outlets (2), the dust gathering arrester (1) both ends are connected separately with two sections of air hoses (3), which is characterized in that the collection
Dust hood (1) further include with the front apron (11) rear baffle disposed in parallel (12), the front apron (11), top plate (13) and after
Baffle (12) is sequentially connected with to form the hollow groove body that a lower section has opening；
Air-supply interlayer (14) and air draft interlayer (15) is internally provided in the hollow groove body of the dust gathering arrester (1), it is described
It blows interlayer (14) and air draft interlayer (15) is arranged each along the length direction of the dust gathering arrester (1), the opening is located at
The lower section of the air draft interlayer (15)；
The air outlet (2) is connected to the air-supply interlayer (14), and multiple air outlets (2) are in the dust gathering arrester
(1) it is distributed on front apron (11) in arc-shaped；
The air hose (3) includes air supply tube (31) and air-exhausting duct (32), and the air supply tube (31) and the air-supply are pressed from both sides
Layer (14) connection, the air-exhausting duct (32) are connected to the air draft interlayer (15)；
The converter secondary flue gas capturing device further includes high-pressure blowing-in mechanism (4) and air draft mechanism (5), the high force feed
Blower structure (4) is connected to the air supply tube (31), and the air draft mechanism (5) is connected to the air-exhausting duct (32).
2. combining the converter secondary flue gas capturing device of air curtain as claimed in claim 2, which is characterized in that it is described it is multiple go out
When on the front apron (11) being in arc-shaped distribution, the circular arc is the center of circle on the circle that radius is 8.6 meters in air port (2)
When angle is 60 degree pair circular arc, and the center of circle is located at the lower section of dust gathering arrester (1).
3. combining the converter secondary flue gas capturing device of air curtain as claimed in claim 2, which is characterized in that the dust gathering arrester
(1) curved opening is offered on front apron (11), the shape of the curved opening and air outlet (2) are on front apron (11)
Distribution shape it is identical, the air outlet (2) is distributed in the curved opening of the front apron (11).
4. combining the converter secondary flue gas capturing device of air curtain as claimed in claim 2, which is characterized in that the air outlet
(2) front apron (11) of the dust gathering arrester (1) is stretched out and the front apron (11) of the air outlet (2) and the dust gathering arrester (1)
Between have greater than 90 degree of angle.
5. combining the converter secondary flue gas capturing device of air curtain as claimed in claim 4, which is characterized in that the air outlet
(2) angle between the front apron (11) of the dust gathering arrester (1) is 135 degree.
6. combining the converter secondary flue gas capturing device of air curtain as described in claim 1, which is characterized in that the air hose
(3) it is integrally formed, is internally provided with air supply tube (31) and air-exhausting duct (32), the air supply tube in the air hose (3)
(31) and air-exhausting duct (32) is arranged each along the length direction of air hose.
7. combining the converter secondary flue gas capturing device of air curtain as claimed in claim 6, which is characterized in that in the air hose
(3) area of air supply tube (31) cross section in and the area ratio of air-exhausting duct (32) cross section meet Formulas I:
Wherein, SPFor air-exhausting duct cross-sectional area, unit m2, SSFor air supply tube cross-sectional area, unit m2, QPFor air-exhausting duct
Interior air draft air quantity, unit m3/ s, QSFor air-supply air quantity in air supply tube, unit m3/ s, ξsFor air supply tube pressure drop coefficient, ξp
For air-exhausting duct pressure drop coefficient, ξs>0,ξp>0。
8. combining the converter secondary flue gas capturing device of air curtain as described in claim 1, which is characterized in that in the air-exhausting duct
(32) it is provided with flame retardant coating on inner wall, is provided with flame retardant coating on the inside of the dust gathering arrester (1).
9. combining the converter secondary flue gas capturing device of air curtain as described in claim 1, which is characterized in that the high force feed
Blower structure (4) includes pressure fan and the plenum chamber that connect with pressure fan, and the plenum chamber and the air supply tube (31) are even
It is logical.
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| CN201811065807.8A CN109022673B (en) | 2018-09-13 | 2018-09-13 | A kind of converter secondary flue gas capturing device of combination air curtain |
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| CN109022673B CN109022673B (en) | 2019-09-17 |
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| CN110613996A (en) * | 2019-09-29 | 2019-12-27 | 西安建筑科技大学 | Self-adaptive water mist dust removal system for casting workshop |
| CN110819758A (en) * | 2019-11-12 | 2020-02-21 | 中冶京诚工程技术有限公司 | Combined converter tertiary dust collecting device and converter steelmaking system |
| CN111850228A (en) * | 2020-08-26 | 2020-10-30 | 中冶京诚工程技术有限公司 | Dust excluding hood and converter tertiary dust removal system thereof |
| CN113237345A (en) * | 2021-03-31 | 2021-08-10 | 蓝天众成环保工程有限公司 | Quenching device with air taking structure and design method of air taking structure |
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| CN110819758A (en) * | 2019-11-12 | 2020-02-21 | 中冶京诚工程技术有限公司 | Combined converter tertiary dust collecting device and converter steelmaking system |
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|---|---|
| CN109022673B (en) | 2019-09-17 |
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