CN101757823A - Bypass wet dedusting system - Google Patents

Bypass wet dedusting system Download PDF

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Publication number
CN101757823A
CN101757823A CN 201010108772 CN201010108772A CN101757823A CN 101757823 A CN101757823 A CN 101757823A CN 201010108772 CN201010108772 CN 201010108772 CN 201010108772 A CN201010108772 A CN 201010108772A CN 101757823 A CN101757823 A CN 101757823A
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CN
China
Prior art keywords
air duct
vertical row
wet
bypass
dedusting
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CN 201010108772
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Chinese (zh)
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CN101757823B (en
Inventor
程珈宁
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China Aluminum International South Engineering Co., Ltd
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CHANGSHA DESIGN INST OF NON-FERROUS METALLURGY
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Priority to CN2010101087729A priority Critical patent/CN101757823B/en
Publication of CN101757823A publication Critical patent/CN101757823A/en
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Abstract

The invention discloses a bypass wet dedusting system which comprises a variable-diameter exhaust hood hermetically connected with a cooling cylinder of a cylinder cooler and the other end of the variable-diameter exhaust hood is hermetically connected with a vertical exhaust cylinder extending out of a building. The end of the vertical exhaust cylinder near the variable-diameter exhaust hood is connected with an inlet duct of a wet deduster; the inside section of the vertical exhaust cylinder extending outdoors is connected with a purified exhaust pipe of the wet deduster; and then a bypass dedusting system is formed. An electric bypass valve is arranged at the inlet end of the inlet duct of the wet deduster and an electric through valve is arranged at the position in the vertical exhaust cylinder and higher than the inlet duct exit of the wet deduster. The invention provides a ventilation dedusting technology mainly based on the wet deduster and assisted by direct natural exhaust. When the bypass dedusting system is stopped for maintenance, the wet steam in the cooling cylinder is exhausted outdoor directly by heat pressure and the draft of the vertical exhaust cylinder, thereby avoiding dry and wet exhaust streaming when both a dry dedusting system and a wet dedusting system are stopped for maintenance simultaneously.

Description

Bypass wet dedusting system
Technical field
The present invention relates to a kind of wet dedusting system, particularly a kind of is the bypass wet dedusting system of assisting based on wet scrubber, direct natural exhaust.
Background technology
In smelting engineering, the postorder workshop section of sintering, crushing and screening is the back powder cooling, be do, the turning point of wet processing.At present, the sintering of leading portion, the air draft of crushing and screening equipment adopt whirlwind to add bag-type dust mostly; Various wet dust removals are then adopted in the cylinder cooler air draft of last part technology, form two kinds of different systems doing wet combination.
High temperature sintering piece more than 300 ℃ is discharged into cylinder cooler behind crushing and screening, directly to material spray normal-temperature water.In cooling procedure, distribute a large amount of saturated damp steam and 5~20g/m of being close to 3The dust of concentration.Routinely, wet dedusting system is at cooling drums discharge place exhaust hood to be set, and extracts the wet dust that steams out and enters wet scrubber by system's airduct, purifies the back high altitude discharge.
When the two kinds of dust pelletizing systems of doing, wet are not stopped transport simultaneously and are overhauled, certainly will cause dry-dedusting system negative pressure exhausting, the damp steam dust is introduced sack cleaner, produce phenomenons such as the sticking bag of dust, increase resistance, reduce efficiency of dust collection greatly, even make the sack cleaner paralysis.Be not fit under the present situation of cylinder cooler dry method dust effective measures, some engineering can only be taked measures such as building partition, equipment barrier in technological process, can't solve the phenomenon of doing wet air draft crossfire at all.
Summary of the invention
Technical problem to be solved by this invention is, at the prior art deficiency, provide a kind of do, wet two kinds of dust pelletizing systems are not stopped transport simultaneously and when overhauling, can not cause the bypass wet dedusting system of dried, wet air draft crossfire.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of bypass wet dedusting system, it comprises the reducing exhaust hood that is tightly connected with cooling drums, this reducing exhaust hood other end vertical row air duct outer with stretching out building is tightly connected, this vertical row air duct goes out the inlet duct of wet scrubber near reducing exhaust hood termination, and this vertical row inflator extends the exhaust duct after outdoor medial segment connects the wet scrubber purification, form a bypass dust pelletizing system, the arrival end of this wet scrubber inlet duct is provided with the bypass motor-driven valve, is higher than the wet scrubber inlet duct in this vertical row air duct and picks out the position and be provided with straight-through motor-driven valve.
The bottom tapering of this reducing exhaust hood is not more than 60 °, thereby the sticking collection of the dust that can prevent to hang is on the cover wall of reducing exhaust hood.
The cross section of this vertical row air duct is circular, and the air duct diameter of this vertical row air duct calculates according to technology air draft flow and sectional wind velocity 2.5~3m/s, and the air duct height of this vertical row air duct satisfies following relation:
H=2.15xS Z/[(A-B)b]m
Wherein: S Z--the draft of-vertical row air duct is the resistance mmH of vertical row air duct air-flow 2O
A---1/ (273+t k), t kBe outside air temperature ℃
B---1/ (273+t Pj), t PjBe the mean temperature of air duct air-flow ℃
The local atmospheric pressure mmH of b--- g
This vertical row air duct height also will satisfy " discharge standard of air pollutants " GB116297-1996 requirement, and exceeds building 1.5m.
The top that should lead directly to motor-driven valve is provided with the pressure filling pipe, and this pressure filling pipe calculates rate of water make-up, determines moisturizing caliber, distribution hole for water spraying quantity and aperture by air water weight ratio 1: 0.2~0.3 along the barrel circumference annular configuration of vertical row air duct.
The pressure of this pressure filling pipe is 0.2~0.3MPa.
This reducing exhaust hood connects cooling drums exhaust outlet and vertical row air duct by flange and bolt seal.
Compared with prior art, the beneficial effect that the present invention had is: bypass wet dedusting system of the present invention causes a bypass loop with wet scrubber, and forming based on wet scrubber, direct natural exhaust is the ventilating dust-removing technology of assisting.Promptly directly over cooling drums discharge place, reducing exhaust hood and vertical row air duct are set, its bottom and discharge gate are tightly connected, and its top is stretched out outdoor, are beneficial to the exhaust of cooling drums nature.Go out the wet scrubber inlet duct at the vertical row inflator near reducing exhaust hood termination, extend outdoor medial segment at the vertical row air duct and connect exhaust duct after wet scrubber purifies, form a bypass dust pelletizing system.When the present invention moves at cylinder cooler, make the damp steam dust air-flow of cooling drums exhaust outlet enter the bypass dust pelletizing system, behind the wet scrubber washing, purifying, enter vertical row air duct high altitude discharge again.Pressure filling pipe on the vertical row air duct carries out hydraulic blow simultaneously, constantly washes away with the air draft air-flow and sticks to the dust that leads directly on the motor-driven valve, leads directly to motor-driven valve, influences switching motion with anti-blocking.When bypass dust pelletizing system maintenance is stopped transport, the damp steam of cooling drums directly by certain draft row of hot pressing and vertical row air duct to outside atmosphere, thereby dried, wet two kinds of dust pelletizing systems are not stopped transport simultaneously and when overhauling, can not cause dried, wet air draft crossfire.
Description of drawings
Fig. 1 is the structural representation of bypass wet dedusting system of the present invention.
The specific embodiment
As shown in Figure 1, bypass wet dedusting system of the present invention comprises the reducing exhaust hood 1 of the cooling drums top that is arranged at cylinder cooler 9, and it mainly act as airtight cooling drums exhaust outlet and all catches the damp steam dust.The bottom of this reducing exhaust hood 1 is connected by flange and bolt seal with the cooling drums exhaust outlet, and the top of this reducing exhaust hood 1 is tightly connected by flange and bolt and a vertical row air duct 2, makes operation of the present invention, maintenance all very convenient like this.The distressed structure of this reducing exhaust hood 1 should be determined according to the geomery of different cooling drums exhaust outlet geomeries and vertical row air duct.Because the cross section of vertical row air duct 2 is generally circle, so this reducing exhaust hood 1 generally is designed to hemispherical dome shape or truncated cone-shaped.For preventing to hang the sticking collection of dust on the cover wall of reducing exhaust hood 1, should guarantee that the bottom tapering of reducing exhaust hood 1 is not more than 60 °, and determine its structure length with this.
Stretch out outside the building 10 on the top of this vertical row air duct 2, to guarantee the discharging naturally of cooling drums damp steam dusty gas.The air duct diameter D of this vertical row air duct 2 should calculate according to technology air draft flow and sectional wind velocity 2.5~3m/s: D=[4x air draft flow/(3600x3.14x sectional wind velocity)] 1/2, in order to avoid outdoor cold air pours in down a chimney, the air duct height of this vertical row air duct 2 should be able to produce certain draft, overcomes the resistance of exhaust flow path, comprises the linear loss of air draft tube and the local losses of bath curtain.Confirm that through test of many times this air duct height H is wanted to satisfy following relation:
H=2.15xS Z/[(A-B)b] (m)
Wherein: S Z--the draft of-air duct is the resistance (mmH of air duct air-flow 2O)
A---1/ (273+t k), t kBe outside air temperature ℃
B---1/ (273+t Pj), t PjBe the mean temperature of air duct air-flow ℃
Local atmospheric pressure (the mmH of b--- g)
In addition, determined vertical row air duct height also will satisfy " discharge standard of air pollutants " GB116297-1996 requirement, and can exceed building 1.5m.
Go out the inlet duct 6 of wet scrubber 8 at vertical row air duct 2 near reducing exhaust hood terminations, extend outdoor medial segment at vertical row inflator 2 and connect exhaust duct 7 after wet scrubber purifies, form a bypass dust pelletizing system.The arrival end of this wet scrubber inlet duct 6 is provided with bypass motor-driven valve 4, and the inlet duct that is higher than wet scrubber in this vertical row air duct 2 picks out the position and is provided with straight-through motor-driven valve 3, and the top of this straight-through motor-driven valve 3 is provided with pressure filling pipe 5.Should lead directly to motor-driven valve 3 and the bypass solenoid valve 4 main switching effects that play bypass wet dedusting and the different loops of vertical natural exhaust, it be carried out distribution control according to operation logic.In order to prevent the dust adhesion corrosion, this bypass motor-driven valve 4 and straight-through motor-driven valve 3 adopt stainless steel, can purchase finished product in market.
In the operation of technology cylinder cooler, start wet scrubber 8 and the bypass motor-driven valve of opening on its inlet duct 64, close the straight-through motor-driven valve 3 on the vertical row air duct 2, make the damp steam dust air-flow of cooling drums exhaust outlet enter the bypass dust pelletizing system, behind wet scrubber 8 washing, purifyings, enter vertical row air duct 2 high altitude discharges again.Open the pressure filling pipe 5 on the vertical row air duct 2 simultaneously, carry out hydraulic blow, constantly wash away with the air draft air-flow and stick to the dust that leads directly on the motor-driven valve 3, lead directly to motor-driven valve 3, influence switching motion with anti-blocking.When the maintenance of bypass dust pelletizing system is stopped transport, close the bypass motor-driven valve 4 on wet scrubber 8 inlet ducts 6 immediately, open the straight-through motor-driven valve 3 on the vertical row air duct 2 simultaneously, directly arrange to outside atmosphere by certain draft of hot pressing and vertical row air duct 2 with the damp steam that guarantees cooling drums.
This pressure filling pipe 5 is sprayed water with the equipment operation always, plays two important function: the one, during bypass wet dedusting, wash away the dust that adheres on the straight-through motor-driven valve 3 of closing on the vertical row air duct 2; The 2nd, during the natural exhaust of vertical row air duct 2, form water curtain washing damp steam dust, reach certain dust-laying effect.So pressure filling pipe 5 should be the barrel circumference annular configuration along vertical row air duct 2, calculate rate of water make-up, determine moisturizing caliber, distribution hole for water spraying quantity and aperture by air water weight ratio 1: 0.2~0.3, guarantee that as far as possible the water curtain in air draft tube cross section is even.Determine the pressure of pressure filling pipe 5 according to relevant parameters such as the specification of technology cylinder cooler, exhaust air rate, exhaust barrel dliameters, be generally 0.2~0.3Mpa, for saving the energy, comprehensive utilization, can clarify the dust discharge pulp-water of wet scrubber 8, provide moisturizing by force (forcing) pump.The structure of pressure filling pipe should be carried out specific design according to different process equipment and desired aiutage size, and the present invention only does with functional explanation.

Claims (6)

1. bypass wet dedusting system, it comprises the reducing exhaust hood that is tightly connected with cooling drums, it is characterized in that, this reducing exhaust hood other end vertical row air duct outer with stretching out building is tightly connected, this vertical row air duct goes out the inlet duct of wet scrubber near reducing exhaust hood termination, and this vertical row inflator extends the exhaust duct after outdoor medial segment connects the wet scrubber purification, form a bypass dust pelletizing system, the arrival end of this wet scrubber inlet duct is provided with the bypass motor-driven valve, is higher than the wet scrubber inlet duct in this vertical row air duct and picks out the position and be provided with straight-through motor-driven valve.
2. bypass wet dedusting system according to claim 1 is characterized in that, the bottom tapering of this reducing exhaust hood is not more than 60 °.
3. bypass wet dedusting system according to claim 1, it is characterized in that, the cross section of this vertical row air duct is circular, and the air duct diameter of this vertical row air duct calculates according to technology air draft flow and sectional wind velocity 2.5~3m/s, and the air duct height of this vertical row air duct satisfies following relation:
H=2.15xS Z/[(A-B)b]m
Wherein: S Z--the draft of-vertical row air duct is the resistance mmH of vertical row air duct air-flow 2O
A---1/ (273+t k), t kBe outside air temperature ℃
B---1/ (273+t Pj), t PjBe the mean temperature of air duct air-flow ℃
The local atmospheric pressure mmH of b--- g
This vertical row air duct height also will satisfy " discharge standard of air pollutants " GB116297-1996 requirement, and exceeds building 1.5m.
4. bypass wet dedusting system according to claim 1, it is characterized in that, the top that should lead directly to motor-driven valve is provided with the pressure filling pipe, this pressure filling pipe calculates rate of water make-up, determines moisturizing caliber, distribution hole for water spraying quantity and aperture by air water weight ratio 1: 0.2~0.3 along the barrel circumference annular configuration of vertical row air duct.
5. bypass wet dedusting system according to claim 4 is characterized in that, the pressure of this pressure filling pipe is 0.2~0.3MPa.
6. bypass wet dedusting system according to claim 1 is characterized in that, this reducing exhaust hood connects cooling drums exhaust outlet and vertical row air duct by flange and bolt seal.
CN2010101087729A 2010-02-10 2010-02-10 Bypass wet dedusting system Active CN101757823B (en)

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Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010101087729A CN101757823B (en) 2010-02-10 2010-02-10 Bypass wet dedusting system

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CN101757823B CN101757823B (en) 2011-09-28

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102078736A (en) * 2010-12-31 2011-06-01 株洲冶炼集团股份有限公司 Exhaust pipe dust collecting device
CN102091524A (en) * 2011-01-14 2011-06-15 长沙有色冶金设计研究院 Method for treating smoke and dust in zinc oxide by alkaline washing elimination
CN103521017A (en) * 2013-10-15 2014-01-22 攀钢集团攀枝花钢钒有限公司 Dust removing device applied to quicklime digesting system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2083696U (en) * 1990-12-31 1991-08-28 张延民 Wet low-resistant dust remover
CN2103090U (en) * 1990-10-04 1992-04-29 张延民 Wet dust remover
US5423272A (en) * 1994-04-11 1995-06-13 Combustion Engineering, Inc. Method for optimizing the operating efficiency of a fossil fuel-fired power generation system
CN1298087A (en) * 1999-11-29 2001-06-06 张培尧 Wet dedusting tower for vertical cement kiln
JP2006022740A (en) * 2004-07-08 2006-01-26 Toyota Motor Corp Exhaust emission control system for internal combustion engine
CN101134160A (en) * 2006-08-30 2008-03-05 中国石油天然气股份有限公司 Reaction device for producing low carbon olefin hydrocarbon through catalytic cracking

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2103090U (en) * 1990-10-04 1992-04-29 张延民 Wet dust remover
CN2083696U (en) * 1990-12-31 1991-08-28 张延民 Wet low-resistant dust remover
US5423272A (en) * 1994-04-11 1995-06-13 Combustion Engineering, Inc. Method for optimizing the operating efficiency of a fossil fuel-fired power generation system
CN1298087A (en) * 1999-11-29 2001-06-06 张培尧 Wet dedusting tower for vertical cement kiln
JP2006022740A (en) * 2004-07-08 2006-01-26 Toyota Motor Corp Exhaust emission control system for internal combustion engine
CN101134160A (en) * 2006-08-30 2008-03-05 中国石油天然气股份有限公司 Reaction device for producing low carbon olefin hydrocarbon through catalytic cracking

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102078736A (en) * 2010-12-31 2011-06-01 株洲冶炼集团股份有限公司 Exhaust pipe dust collecting device
CN102091524A (en) * 2011-01-14 2011-06-15 长沙有色冶金设计研究院 Method for treating smoke and dust in zinc oxide by alkaline washing elimination
CN102091524B (en) * 2011-01-14 2013-03-13 长沙有色冶金设计研究院有限公司 Method for treating smoke and dust in zinc oxide by alkaline washing elimination
CN103521017A (en) * 2013-10-15 2014-01-22 攀钢集团攀枝花钢钒有限公司 Dust removing device applied to quicklime digesting system
CN103521017B (en) * 2013-10-15 2015-08-05 攀钢集团攀枝花钢钒有限公司 For the dust arrester of quicklime slaking system

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Effective date of registration: 20200923

Address after: 410021 22-23 / F, building 6, Jilian commercial center, 268 Laodong Road, Yuhua District, Changsha City, Hunan Province

Patentee after: China Aluminum International South Engineering Co., Ltd

Address before: 410011 Changsha Jiefang Middle Road, Hunan, No. 199

Patentee before: CHANGSHA ENGINEERING & RESEARCH INSTITUTE OF NONFERROUS METALLURGY Co.,Ltd.

TR01 Transfer of patent right