CN103447151A - Compound type electric demister as well as process and use thereof - Google Patents
Compound type electric demister as well as process and use thereof Download PDFInfo
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- CN103447151A CN103447151A CN2013103832467A CN201310383246A CN103447151A CN 103447151 A CN103447151 A CN 103447151A CN 2013103832467 A CN2013103832467 A CN 2013103832467A CN 201310383246 A CN201310383246 A CN 201310383246A CN 103447151 A CN103447151 A CN 103447151A
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Abstract
The invention belongs to the field of flue gas desulfurization, and provides a compound type electric demister used for a wet flue gas desulfurization (WFGD) technology and a process of the compound type electric demister. The compound type electric demister comprises a shell, wherein a flue gas inlet and a flue gas outlet are formed at the two sides of the shell; the compound type electric demister is characterized in that a plurality of parallel dust collecting electrodes are arranged in the shell, wherein the dust collecting electrodes are used for dividing a flue into a plurality of small flues; guide plates are arranged on the front parts of the dust collecting electrodes; discharging electrodes are arranged in the small flues; the tops of the dust collecting electrodes are connected with a water washing device; the dust collecting electrodes are made up of baffle plates, and grooves are arranged on the dust collecting electrodes. A mechanical and electric field combined demisting way is adopted. The compound type electric demister disclosed by the invention is mainly used for wet flue gas desulfurization, and further can be used for removing pollutants including dust, PM (Particulate Matter) 10, PM2.5, toxic heavy metals, sulfur trioxide and the like in the flue gas while demisting. Moreover, the compound type electric demister has the characteristics of being high in demisting efficiency, small in occupied space and low in manufacturing cost.
Description
Technical field
The invention belongs to filed of flue gas purification, a kind of demister for wet process of FGD (WFGD) technology specifically, be mainly used in solving the too much problem of the gypsum rain of limestone-gypsum method WFGD unit and ammonia process WFGD unit aerosol dust.
Background technology
China approximately 70% power station wet desulphurization (WFGD) unit does not configure smoke re-heater (GGH).At present, the gypsum rain phenomenon has appearred in many limestone-gypsum method WFGD units that do not configure GGH; The dust exceeding phenomenon has appearred that in flue gas, aerosol is too much, in many ammonia process WFGD units that do not configure GGH.
Cause gypsum rain and the ammonia process WFGD unit aerosol dust of limestone-gypsum method WFGD unit too much mainly to come from flue gas carrying secretly in a large number slurries in desulfurizing tower.Remove slurries drop in flue gas and mainly contain two schemes, in the desulfurizing tower outlet, set up mechanical demister or wet electrical dust precipitator.But this two schemes all has problems in actual applications.
The machinery demister utilizes inertia force that drop in flue gas is removed.But the demist efficiency of mechanical demister is lower, China WFGD unit has substantially all been installed mechanical demister at present, but still the phenomenon that old many units exist gypsum rain and aerosol dust to exceed standard.
Wet electrical dust precipitator utilizes electrostatic force that drop in flue gas is removed.Although wet electrical dust precipitator demist efficiency can reach more than 90%.But flue gas flow rate is lower in wet-esp, is about 2m/s, low flow velocity cause wet electrical dust precipitator to take a large amount of spaces and cost high.
Combined type electric demister of the present invention gets up mechanical demister and wet electrical dust precipitator organic assembling, adopts machinery and two kinds of common demists of method of electric field.The Combined type electric demister has absorbed the advantage of mechanical demister and wet electrical dust precipitator, has abandoned the inferior position of mechanical demister and wet electrical dust precipitator; It is high that it has demist efficiency, take up room less, and the characteristics that cost is low.
Summary of the invention
The object of the invention is to provides a kind of demister for stove WFGD system.This device adopts machinery and two kinds of common demists of Combination of Methods of electric field.This device especially has good specific aim to power station WFGD.Device has following two characteristics:
1. demist efficiency is high, takes up room less, and cost is low.
2. not only can demist, but also can remove dust in flue gas, PM
10, PM
2.5, the multiple pollutant such as toxic heavy metal and sulfur trioxide.
A kind of Combined type electric demister of the present invention, comprise housing, and the housing both sides are provided with smoke entrance, it is characterized in that in housing being provided with some parallel dust collector poles, and dust collector pole is divided into some bottom flues by flue; The dust collector pole front portion arranges deflector, is provided with discharge electrode in bottom flue, and the dust collector pole top connects rinse water arrangement; Described dust collector pole is comprised of deflection plate, and the hook groove is arranged on dust collector pole.
Described rinse water arrangement comprises the circulation of flushing pipe and hull outside.Circulation is comprised of make-up water pipeline, circulating water line, cyclic water tank, water pump, filter etc.
Combined type electric demist technique of the present invention, is characterized in that adopting machinery and electric field combination demister pattern.
In described technique, between discharge electrode and dust collector pole, form electric field, under the effect of electric field force, droplet is shifted to dust collector pole.
In described technique, adopt flushing water to remove dust on dust collector pole.
Combined type electric demister of the present invention, be mainly used in wet process of FGD, in the time of demist, can also remove dust in flue gas, PM
10, PM
2.5, the pollutant such as toxic heavy metal and sulfur trioxide.
Usually, this device comprises Combined type electric demister body and circulation.Combined type electric demister body consists of deflector, discharge electrode, the dust suction utmost point, flushing pipe, housing and support.Deflector, discharge electrode, the dust suction utmost point, flushing pipe are positioned in housing, fixing by supporting.
In Combined type electric demister body apparatus, some dust suction utmost points that are parallel to each other are divided into a plurality of flue gas passage aisles by flue.Dust collector pole is comprised of deflection plate, has the hook groove on dust collector pole.Arrange discharge electrode between the dust suction utmost point, the extremely anterior deflector of settling of dust suction.Dust suction utmost point top layout flushing pipe, the flushing pipe circulation outside with device is connected.
The present invention and existing two technology are the most approaching, and these two technology are mechanical demister technology and wet electrical dust precipitator technology.
In shape, structure and combination thereof, the total essential features of the present invention and mechanical demister technology is: utilize the inertia force demist, flue is divided into some passage aisles by baffle arrangement, and the hook groove is arranged on baffle arrangement.
In shape, structure and combination thereof, the technical characterictic that the present invention is different from mechanical demister technology is: not only adopt the inertia force demist but also adopt the electrostatic force demist, baffle arrangement is made into dust collector pole, places discharge electrode between baffle arrangement.Electrostatic force between discharge electrode and dust collector pole has fog removal performance.
In shape, structure and combination thereof, the total essential features of the present invention and wet electrical dust precipitator technology is: utilize the electrostatic force demist, device is comprised of demister body and flushing water system.The demister body consists of deflector, discharge electrode, the dust suction utmost point, flushing pipe, housing and support.
In shape, structure and combination thereof, the technical characterictic that the present invention is different from the wet electrical dust precipitator technology is: not only adopt the electrostatic force demist but also adopt the inertia force demist, the dust suction utmost point adopts baffle arrangement, and the hook groove is arranged in dust suction extremely.
The Specifeca tion speeification contrast of the present invention and mechanical demister, wet electrical dust precipitator is in Table 1.From table 1, contrast mechanical demister, the demist efficiency of Combined type electric demister of the present invention rises to 85% by 70%, and this has fully guaranteed the elimination of gypsum rain and aerosol dust phenomenon; The contrast wet electrical dust precipitator, the demist efficiency of Compound Water ordinary telegram demister of the present invention drops to 85% by 95%, and inner flue gas flow rate rises to 7 m/s by 2 m/s, and this has realized, in the situation that guarantee gypsum rain and the elimination of aerosol dust phenomenon, reduce the device space and also reduce equipment investment.
Table 1. Specifeca tion speeification
| Project | Unit | The Combined type electric demister | The machinery demister | Wet electrical dust precipitator |
| Demist efficiency | % | 85 | 60 | 95 |
| Inner flue gas flow rate | m/s | 7 | 20 | 2 |
The accompanying drawing explanation
Fig. 1 is embodiment of the present invention Combined type electric demister process flow diagram; Fig. 2 is embodiment Combined type electric demister body construction schematic diagram; Fig. 3 is the side-looking semi-section structural representation of Fig. 2; Fig. 4 is embodiment Combined type electric demister dust collector pole structural representation.
In figure, 1-Combined type electric demister body; 2-make-up water pipeline; The 3-circulating water line; The 4-cyclic water tank; The 5-water pump; The 6-filter; The 7-smoke inlet; The 8-discharge electrode; The 9-housing; The 10-flushing pipe; The 11-high frequency electric source; The 12-exhanst gas outlet; The 13-deflector; The 14-dust collector pole; The 15-groove; 16-dust collector pole passage.
The specific embodiment
Operation principle and running status below in conjunction with accompanying drawing to this novel combined electrostatic precipitator are described further.
Embodiment: the main feature of the present embodiment Combined type electric demister is that dust collector pole (14) adopts baffle arrangement, and hook groove (15) is arranged on dust collector pole.
Specifically, Combined type electric demister process system as shown in Figure 1, is connecting circulation outside Combined type electric demister body (1), and circulation is used for rinsing the upper ash content of dust collector pole (14).Circulation is comprised of make-up water pipeline (2), circulating water line (3), cyclic water tank (4), water pump (5), filter (6).
As shown in Figure 2, a plurality of parallel dust collector poles (14) are divided into some bottom flues (16) by flue to Combined type electric demister body (1) structure, and dust collector pole (14) front portion arranges deflector (13) and is used for the uniform distribution air-flow.Be provided with discharge electrode (8) in dust collector pole bottom flue (16).Wash tub pipe (10) is arranged at dust collector pole (14) top, and wash tub pipe (10) is connected with the outer loop water system.The top of Combined type electric demister body (1) is high frequency electric source (11).High frequency electric source (11) is connected with discharge electrode (8) by cable.As shown in Figure 3, dust collector pole (14) is comprised of deflection plate dust collector pole (14) structure, and dust collector pole (14) is upper with hook groove (15).
During the device operation, Combined type electric demister body (1) is positioned in the horizontal flue after WFGD, and flue gas enters from Combined type electric demister entrance (7), by deflector (13), distributes, and flows into each dust collector pole passage (16).Flue gas is accepted machinery and two kinds of method demists of electric field in dust collector pole passage (16).The machinery demist is embodied in, and dust collector pole (14) is comprised of deflection plate, and dust collector pole has the hook groove on (14), and deflection plate and hook groove have the ability of trapping drop.The electric field demist is embodied in, and between discharge electrode (8) and dust collector pole (14), forms electric field, and under the effect of electric field force, drop is shifted to dust collector pole.Flue gas after purification is discharged from Combined type electric demister outlet (12).Flushing water rinses the flue dust of collecting on dust collector pole to get off to send into cyclic water tank (4), and the water in cyclic water tank (4) can be recycled after filter (6) purifies.
The electric field of Combined type electric demister not only can be removed droplet, and can also remove the flying dust in flue gas, to fine particulates PM
10, PM
2.5, toxic heavy metal and sulfur trioxide removed significant effect.
The design of dust collector pole (14) structure is emphasis of the present invention and innovative point.The dust collector pole structure is determined after having adopted the Fluid Mechanics Computation model optimization.
Claims (7)
1. a Combined type electric demister, comprise housing, and the housing both sides are provided with smoke entrance, it is characterized in that in housing being provided with some parallel dust collector poles, and dust collector pole is divided into some bottom flues by flue; The dust collector pole front portion arranges deflector, is provided with discharge electrode in bottom flue, and the dust collector pole top connects rinse water arrangement; Described dust collector pole is comprised of deflection plate, and the hook groove is arranged on dust collector pole.
2. Combined type electric demister as claimed in claim 1, is characterized in that described rinse water arrangement comprises the circulation of flushing pipe and hull outside.
3. the demist technique of Combined type electric demister as claimed in claim 1, is characterized in that adopting machinery and electric field combination demister pattern.
4. demist technique as claimed in claim 3, is characterized in that forming electric field between discharge electrode and dust collector pole, and under the effect of electric field force, droplet is shifted to dust collector pole.
5. demist technique as claimed in claim 3, is characterized in that adopting flushing water to remove dust on dust collector pole.
6. the purposes of Combined type electric demister as claimed in claim 1, is characterized in that for wet process of FGD.
7. purposes as claimed in claim 6, when it is characterized in that demist, remove dust in flue gas, PM
10, PM
2.5, toxic heavy metal and sulfur trioxide.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013103832467A CN103447151A (en) | 2013-08-29 | 2013-08-29 | Compound type electric demister as well as process and use thereof |
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|---|---|---|---|
| CN2013103832467A CN103447151A (en) | 2013-08-29 | 2013-08-29 | Compound type electric demister as well as process and use thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103933813A (en) * | 2014-04-01 | 2014-07-23 | 国电环境保护研究院 | Combined dust removing and defogging device for smoke |
| CN104258996A (en) * | 2014-10-14 | 2015-01-07 | 福建龙净环保股份有限公司 | Composite demister |
| CN104607317A (en) * | 2015-02-05 | 2015-05-13 | 青岛达能环保设备股份有限公司 | Efficient baffle plate coagulation wet type electrostatic precipitator system |
| CN104607316A (en) * | 2015-01-17 | 2015-05-13 | 浙江中泰环保装备有限公司 | Wet type electric precipitator |
| CN105214510A (en) * | 2014-04-15 | 2016-01-06 | 纳米新能源（唐山）有限责任公司 | Based on the PM2.5 filter membrane and preparation method thereof of triboelectricity |
| CN105214839A (en) * | 2015-10-21 | 2016-01-06 | 国电南京自动化股份有限公司 | A kind of wet type demister |
| CN105944531A (en) * | 2016-06-29 | 2016-09-21 | 南京龙源环保有限公司 | Denitrating and dust removing device |
| WO2018127212A1 (en) * | 2017-01-05 | 2018-07-12 | 四川厨源不锈钢设备有限公司 | Electrostatic field structure with collecting electrode band and oil-guiding groove |
| CN114682062A (en) * | 2022-04-06 | 2022-07-01 | 西安交通大学 | Flue gas moisture recovery device based on dissimilar charging and working method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103933813A (en) * | 2014-04-01 | 2014-07-23 | 国电环境保护研究院 | Combined dust removing and defogging device for smoke |
| CN105214510A (en) * | 2014-04-15 | 2016-01-06 | 纳米新能源（唐山）有限责任公司 | Based on the PM2.5 filter membrane and preparation method thereof of triboelectricity |
| CN104258996A (en) * | 2014-10-14 | 2015-01-07 | 福建龙净环保股份有限公司 | Composite demister |
| CN104607316A (en) * | 2015-01-17 | 2015-05-13 | 浙江中泰环保装备有限公司 | Wet type electric precipitator |
| CN104607316B (en) * | 2015-01-17 | 2017-12-15 | 浙江中泰环保股份有限公司 | A kind of wet electrical dust precipitator |
| CN104607317A (en) * | 2015-02-05 | 2015-05-13 | 青岛达能环保设备股份有限公司 | Efficient baffle plate coagulation wet type electrostatic precipitator system |
| CN105214839A (en) * | 2015-10-21 | 2016-01-06 | 国电南京自动化股份有限公司 | A kind of wet type demister |
| CN105944531A (en) * | 2016-06-29 | 2016-09-21 | 南京龙源环保有限公司 | Denitrating and dust removing device |
| WO2018127212A1 (en) * | 2017-01-05 | 2018-07-12 | 四川厨源不锈钢设备有限公司 | Electrostatic field structure with collecting electrode band and oil-guiding groove |
| CN114682062A (en) * | 2022-04-06 | 2022-07-01 | 西安交通大学 | Flue gas moisture recovery device based on dissimilar charging and working method thereof |
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Inventor after: Li Rengang Inventor after: Lei Da Inventor after: Ni Yiqun Inventor after: Zhu Weiqi Inventor after: Hu Jiao Inventor before: Lei Da Inventor before: Li Rengang Inventor before: Jiang Jie |
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Application publication date: 20131218 |
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