CN103008109A - Hollow polar plate electrostatic dust removing device made of porous medium material and method - Google Patents

Hollow polar plate electrostatic dust removing device made of porous medium material and method Download PDF

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Publication number
CN103008109A
CN103008109A CN2012105535494A CN201210553549A CN103008109A CN 103008109 A CN103008109 A CN 103008109A CN 2012105535494 A CN2012105535494 A CN 2012105535494A CN 201210553549 A CN201210553549 A CN 201210553549A CN 103008109 A CN103008109 A CN 103008109A
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hollow
pole plate
polar plate
porous media
media material
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CN2012105535494A
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CN103008109B (en
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由长福
王晓华
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Tsinghua University
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Tsinghua University
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Abstract

The invention discloses a hollow polar plate electrostatic dust removing device made of a porous medium material and an electrostatic dust removing method, and belongs to the technical field of dust removal. The electrostatic dust removing device is characterized in that a hollow polar plate is made of the porous medium material, water passes through the porous medium material to form a water film on the surface of the polar plate after being fed to capture particles deposited on the surface of the polar plate due to the action of static electric field; when a lot of particles which are difficult to remove are deposited on the surface of the polar plate, gas is fed into the polar plate and passes through the porous medium material to form a temporary air film on the surface of the polar plate to remove the particles; and the water feeding and the air supply are performed alternately. The dust removing device can effectively reduce the water consumption of wet dust removal and ensures complete water film coverage for the dust collecting polar plate to achieve the aim of efficiently removing the particles. An electrostatic dust removing system adopting the device has the advantages of compact structure, less water and high efficiency, and easiness in large-scale application.

Description

The hollow polar plate electrostatic precipitation device and method that a kind of porous media material consists of
Technical field
The present invention relates to the hollow polar plate electrostatic precipitation device and method that a kind of porous media material consists of, belong to the dedusting technology field.
Background technology
A large amount of gaseous contaminants that mankind's activity produces and particle are just threatening human rely in the base substance of existence---clean air.Pellet (PM 10) fine particle (PM particularly 2.5) pollute and to have become outstanding atmospheric environment problem, and day by day cause the great attention of countries in the world.It has been recognized that Atmospheric particulates (particularly wherein fine particle) are the main causes that causes the human death rate to rise.Simultaneously, Atmospheric particulates also are the main causes that causes the great atmosphere polluting problems such as atmospheric visibility reduction, acid rain, Global climate change and depletion of the ozone layer.The pollution of control fine particle is the great demand of global energy-saving and emission-reduction strategy.Within quite long period, fine particle can not change as the basal conditions of the primary pollutant of China's atmosphere pollution.At present, China's atmosphere PM 2.5The high several times of concentration ratio developed country cause very large threat to health and socio-economic development, and the emission control of fine particle has been extremely urgent.
At present, very low for fine grain capture rate although the total particulate control technology can reach very high level in the world, cause in the fine particle entered environment atmosphere of enormous amount.Take coal fired power plant as example, although the efficiency of dust collection of existing dust arrester can be up to more than 99%, these dedusters are lower to the capture rate of fine particle.This part flying dust take particle diameter less than the fine grained of 2.5 microns even submicron order as main, can reach more than 90% of particle sum in the quantity of particle.This also is that China's overall suspended pellet (TSP) in atmosphere is year by year downward trend, in the situation that granular material discharged total amount also descends, and PM 2.5Reason in rising trend, therefore, particle control focus on fine particle, must seek more effective and more targetedly technical development approach.
Being devoted to improve and optimize the research that traditional pollutant control appliance removes the fine particle capturing ability both at home and abroad increases gradually.For example improve fibrous material and the structure of filter bag on traditional bag-type dust collecting equipment basis, pass through to increase the methods such as middle high energy electrode on conventional electrostatic cleaner basis.Under stricter fine particle discharge standard, adopt any single technology that removes all can't satisfy the demands, it is day by day urgent therefore to develop different control modes cooperation-removal technology.
Electrostatic precipitator take electrostatic field as removal mechanism obtains very general application as fume dust remover commonly used at present at electric power enterprise and cement industry.Utilizing electrostatic field to remove particle mainly is that electrostatic force is applied directly on the particle in industrial application, makes charging particle, and moves on the different in nature electrode, thereby realize removing.In the practical operation, produce corona discharge mainly with high voltage direct current at two interpolars, dust-contained airflow is by between two electrodes during electric field, and particle is forced to charged, and charged particle captures to opposite polarity pole plate motion and by pole plate under the effect of electrostatic force.
Electric cleaner has good removal effect for the large-size particles thing, but not high for the removal efficiency of granule especially fine particle.In order to remove better fine particle, multistage electric field often is set, to improve as much as possible the removal efficiency to particle in practical engineering application.But utilize this method, also not obvious to the raising of efficiency of dust collection.The fine particle that a major reason that causes this phenomenon is exactly this particle size range is easy to follow flow of flue gas, a little less than the horizontal proliferation, and reentrainment of dust may occur.How to strengthen electrostatic field and laterally act on the important development direction that remains raising fine particle arresting efficiency.Industrialized wet static dedusting device all adopts pole plate to apply the moisture film technology at present, such as Chinese patent 02222513.7,00215471.4,200410058967.1 etc.The method that applies moisture film all adopts to the mode of polar board surface water spray carries out, for avoiding imperfect dust collecting pole plate corrosion and the efficiency of dust collection that causes of the dried district of the local formation of polar board surface or moisture film low, need to spray into a large amount of water and keep the normal operation of system, certainly will cause like this increase of water consumption.Chinese patent 20111048292.7 has proposed a kind of testing arrangement of dust collector pole liquid film of wet cottrell, can monitor polar board surface and district's problem whether occur doing.
In sum, how providing a kind of effective assurance pole plate liquid film to cover complete wet static dedusting device, reduce the consumption of water when realizing efficiently removing particle, is present those skilled in the art's problem demanding prompt solution.
Summary of the invention
The hollow polar plate electrostatic precipitation device and method that the purpose of this invention is to provide a kind of low water consumption, high efficiency porous media material formation.
The objective of the invention is to be achieved through the following technical solutions:
The hollow polar plate electrostatic precipitation device that a kind of porous media material consists of, this device comprises a plurality of unit and dust collections of gathering dust, each unit that gathers dust comprises dust collecting pole plate and polar curve, it is characterized in that: dust collecting pole plate is the hollow pole plate, and its internal chamber is hexahedron structure; The hollow polar board surface is made of porous media material; On the hollow pole plate, be connected with air-supplying valve with inlet valve by pipeline respectively.
The hollow polar plate electrostatic precipitation device that porous media material of the present invention consists of is characterized in that: described porous media material adopts metal, metal alloy, pottery, macromolecular compound, carbon, glass, resin or linen-cotton.
The hollow polar plate electrostatic precipitation device that porous media material of the present invention consists of, it is characterized in that: the porosity of described porous media material is 0.3~0.9, average pore size is 0.1~100 μ m.
The hollow polar plate electrostatic precipitation device that porous media material of the present invention consists of, it is characterized in that: the interior surface spacing that the hollow pole plate is relative with the both sides polar curve is 10~50mm.
The hollow polar plate electrostatic precipitation method that a kind of porous media material provided by the invention consists of is characterized in that the method comprises the steps:
When 1) air-supplying valve is closed, inlet valve is opened, water enters the hollow pole plate and is full of whole chamber, water forms moisture film from the outflow of porous media material hole and at hollow pole plate outer surface, capture is deposited on the particle on dust collecting pole plate surface by electrostatic field, and flows into the dust collection of electrostatic precipitator;
When 2) inlet valve was closed, after moisture was discharged in hollow pole plate chamber, air-supplying valve was opened, and the gas that passes into passes from the porous media material hole, and hollow pole plate outside deposition particle is removed;
3) repeating step 1) and 2).
The hollow polar plate electrostatic precipitation method that a kind of porous media material of the present invention consists of,, it is characterized in that: in system's running, the gas average discharge that hollow polar board surface unit are passes into during air feed is 0.005~1m 3/ s, duration of ventilation are 1~10s.
The hollow polar plate electrostatic precipitation method that a kind of porous media material of the present invention consists of,, it is characterized in that: hollow pole plate chamber inner volume is less than 1/3 of chamber volume when passing into gas.
The present invention compared with prior art, have the following advantages and the high-lighting effect: 1. do not carrying out under the prerequisite of larger change to the routine intravenous Design of Electrostatic Precipitator, can implement by pipeline and the valve of changing existing dust collecting pole plate and connection water inlet and air feed, can conveniently be used for design upgrading and the plant modification of existing electrostatic dust collection equipment; 2. owing to adopted water supply line to supply water to the hollow pole plate, water forms moisture film from the porous media outflow and at hollow pole plate outer surface, to remove particle, need not to arrange specially external nozzles and cleans the polar board surface particle, compare with existing conventional wet cottrell, can reduce system cost; 3. after adopting porous media material, dust collecting pole plate surface moisture film covers complete, can guarantee higher dust-collecting efficiency; After gas fed the hollow pole plate, formed air film can effectively be removed the particle that adheres to the surface on hollow pole plate porous media material surface, guarantees the effect of deashing, and can reduce the consumption of water.
Description of drawings
Fig. 1 is the hollow pole plate of porous media material formation provided by the invention and the structural representation of air-supplying valve and inlet valve.
Fig. 2 is that hollow pole plate and the polar curve of hollow polar board surface when applying moisture film arranged sketch.
Fig. 3 is that hollow pole plate and the polar curve of hollow polar board surface when applying air film arranged sketch.
Among the figure: 1-hollow pole plate, 2-polar curve, 3-inlet valve, 4-air-supplying valve, 5-moisture film.
The specific embodiment
Below in conjunction with accompanying drawing principle of the present invention, structure and the course of work are described further.
The hollow polar plate electrostatic precipitation device that a kind of porous media material provided by the invention consists of, this device comprises a plurality of unit and dust collections of gathering dust, each unit that gathers dust comprises dust collecting pole plate and polar curve 2, and dust collecting pole plate adopts hollow pole plate 1, and its internal chamber is hexahedron structure; The hollow polar board surface is made of porous media material; On hollow pole plate 1, are connected with air-supplying valve by pipeline and inlet valve 3 respectively and are connected.The porous media material that hollow polar plate electrostatic precipitation device adopts adopts metal, metal alloy, pottery, macromolecular compound, carbon, glass, resin or linen-cotton.When adopting flexible material, such as linen-cotton, carbon cloth or glass fabric, metal framework structure need to be set, to keep the shape of hollow pole plate 1.The porosity of porous media material is 0.3~0.9, and average pore size is 0.1~100 μ m.The interior surface spacing that the hollow pole plate is relative with the both sides polar curve is 10~50mm.
The unit that gathers dust proposed by the invention is when assembling electrostatic precipitator total system, and the end unit that gathers dust only arranges water supply line, and steam line is not set.It mainly is the problem that can not be captured in airborne dust later stage of avoiding air feed to cause.
The course of work of the present invention is as follows:
When 1) air-supplying valve 4 is closed, inlet valve 3 is opened, water enters hollow pole plate 1 and is full of whole chamber, water forms moisture film 5 from the outflow of porous media material hole and at hollow pole plate 1 outer surface, capture is deposited on the particle on dust collecting pole plate surface by electrostatic field, and flows into the dust collection of electrostatic precipitator;
When 2) inlet valve 3 was closed, after moisture was discharged in hollow pole plate 1 chamber, air-supplying valve 4 was opened, and the gas that passes into passes from the porous media material hole, and hollow pole plate 1 outside deposition particle is removed;
3) repeating step 1) and 2).
In system's running, the gas average discharge that hollow polar board surface unit are passes into during air feed is generally 0.005~1m 3/ s, duration of ventilation are 1~10s.
Hollow pole plate chamber inner volume is less than 1/3 of chamber volume when passing into gas.
When the electrostatic precipitator Control System Design, except routine intravenous electric cleaner control strategy, also need to consider following strategy: the open frequency of air-supplying valve is set and need to be determined according to the character of hollow polar board surface institute adhered particles thing.If there is the pole plate corrosion, when there is damaging problem in polar board surface, stop the unlatching of inlet valve, adopt the interruption plenum system to carry out deashing.

Claims (7)

1. the hollow polar plate electrostatic precipitation device that consists of of a porous media material, this device comprises a plurality of unit and dust collections of gathering dust, each unit that gathers dust comprises dust collecting pole plate and polar curve (2), it is characterized in that: dust collecting pole plate adopts hollow pole plate (1), and its internal chamber is hexahedron structure; The hollow polar board surface is made of porous media material; On the hollow pole plate, be connected 4 with inlet valve (3) with air-supplying valve by pipeline respectively) be connected.
2. the hollow polar plate electrostatic precipitation device that consists of according to porous media material claimed in claim 1 is characterized in that: described porous media material adopts metal, metal alloy, pottery, macromolecular compound, carbon, glass, resin or linen-cotton.
3. the hollow polar plate electrostatic precipitation device that consists of according to porous media material claimed in claim 1, it is characterized in that: the porosity of described porous media material is 0.3~0.9, average pore size is 0.1~100 μ m.
4. the hollow polar plate electrostatic precipitation device that consists of according to porous media material claimed in claim 1, it is characterized in that: the interior surface spacing that the hollow pole plate is relative with the both sides polar curve is 10~50mm.
5. the hollow polar plate electrostatic precipitation method that employing is installed as claimed in claim 1 is characterized in that the method comprises the steps:
1) air-supplying valve (4) is when closing, inlet valve (3) is opened, water enters hollow pole plate (1) and is full of whole chamber, water forms moisture film (5) from the outflow of porous media material hole and at hollow pole plate (1) outer surface, capture is deposited on the particle on dust collecting pole plate surface by electrostatic field, and flows into the dust collection of electrostatic precipitator;
2) inlet valve (3) is when closing, and after moisture was discharged in hollow pole plate (1) chamber, air-supplying valve (4) was opened, and the gas that passes into passes from the porous media material hole, and hollow pole plate (1) outside deposition particle is removed;
3) repeating step 1) and 2).
6. according to hollow polar plate electrostatic precipitation method claimed in claim 5, it is characterized in that: in system's running, the gas average discharge that hollow polar board surface unit are passes into during air feed is 0.005~1m 3/ s, duration of ventilation are 1~10s.
7. according to hollow polar plate electrostatic precipitation method claimed in claim 5, it is characterized in that: hollow pole plate chamber inner volume is less than 1/3 of chamber volume when passing into gas.
CN201210553549.4A 2012-12-18 2012-12-18 The hollow polar plate electrostatic precipitation device and method that a kind of porous media material is formed Active CN103008109B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103272697A (en) * 2013-05-06 2013-09-04 清华大学 Chambered structure dust-collecting pole plate for wet-type electrostatic dust collection
CN103341409A (en) * 2013-06-28 2013-10-09 中节环立为(武汉)能源技术有限公司 Dust-collecting pole plate of wet water-film electrostatic precipitator
CN111558270A (en) * 2020-04-29 2020-08-21 刘根凡 Porous medium liquid film dust remover

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62136255A (en) * 1985-12-11 1987-06-19 Miyahara Isao Dust collector
JP2001046907A (en) * 1999-08-06 2001-02-20 Mitsubishi Heavy Ind Ltd Electric dust collector
CN201625582U (en) * 2010-02-23 2010-11-10 曹婷婷 Polar plate of electric dust collector
CN201644221U (en) * 2010-05-17 2010-11-24 山东电力研究院 Dry-wet mixed electrical dust remover
CN202590955U (en) * 2011-12-28 2012-12-12 宝山钢铁股份有限公司 Three-area electric coagulation dust catcher
CN203253532U (en) * 2012-12-18 2013-10-30 清华大学 Hollow pole plate electrostatic dust removing apparatus formed from porous dielectric material

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62136255A (en) * 1985-12-11 1987-06-19 Miyahara Isao Dust collector
JP2001046907A (en) * 1999-08-06 2001-02-20 Mitsubishi Heavy Ind Ltd Electric dust collector
CN201625582U (en) * 2010-02-23 2010-11-10 曹婷婷 Polar plate of electric dust collector
CN201644221U (en) * 2010-05-17 2010-11-24 山东电力研究院 Dry-wet mixed electrical dust remover
CN202590955U (en) * 2011-12-28 2012-12-12 宝山钢铁股份有限公司 Three-area electric coagulation dust catcher
CN203253532U (en) * 2012-12-18 2013-10-30 清华大学 Hollow pole plate electrostatic dust removing apparatus formed from porous dielectric material

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103272697A (en) * 2013-05-06 2013-09-04 清华大学 Chambered structure dust-collecting pole plate for wet-type electrostatic dust collection
CN103272697B (en) * 2013-05-06 2016-01-13 清华大学 A kind of wet static dedusting chamber structure dust collecting pole plate
CN103341409A (en) * 2013-06-28 2013-10-09 中节环立为(武汉)能源技术有限公司 Dust-collecting pole plate of wet water-film electrostatic precipitator
CN103341409B (en) * 2013-06-28 2016-08-10 中节环立为(武汉)能源技术有限公司 The dust collecting pole plate of wet type moisture film electrostatic precipitator
CN111558270A (en) * 2020-04-29 2020-08-21 刘根凡 Porous medium liquid film dust remover

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