CN202606281U - Electric deduster for PM2.5 micronic dust - Google Patents
Electric deduster for PM2.5 micronic dust Download PDFInfo
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- CN202606281U CN202606281U CN 201220143447 CN201220143447U CN202606281U CN 202606281 U CN202606281 U CN 202606281U CN 201220143447 CN201220143447 CN 201220143447 CN 201220143447 U CN201220143447 U CN 201220143447U CN 202606281 U CN202606281 U CN 202606281U
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Abstract
The utility model relates to an electric deduster for PM2.5 micronic dust. The electric deduster for PM2.5 micronic dust comprises a coagulation region, a stream guiding region and a membrane electrostatic dedusting region communicated sequentially. The coagulation region is communicated with a normal electric dedusting system. A plurality of dust collecting plates are arranged at intervals to form a plurality of micronic dust channels which are consistent in direction of micronic dust. Same micronic dust channel is internally provided with a discharge electrode which is vertical to the direction of micronic dust and has a same polarity. The polarities of the discharge electrodes in adjacent micronic dust channels are contrary so that micronic dust in the region has different charges. The stream guiding region is communicated with the coagulation region and is provided with a plurality of stream guiding plates vertical to the direction of micronic dust. The side faces of the stream guiding plates face the direction of micronic dust so that the micronic dust with different charges is coagulated in the region. The membrane electrostatic dedusting region is communicated with the stream guiding region and is provided with a plurality of dust collecting membranes arranged at intervals to form a plurality of charge micronic dust channels which are consistent in the direction of micronic dust. Each charge micronic dust channel is internally provided with a plurality of cathode discharge electrodes so that charge micronic dust coagulated is captured by the dust collecting membranes in the region. The electric deduster for PM2.5 micronic dust is good in effect and low in cost.
Description
Technical field
The utility model relates to thermoelectricity industry dedusting technology, relates in particular to a kind of PM2.5 micronic dust electric cleaner.
Background technology
PM2.5 is meant that diameter in the atmosphere is less than or equal to the particle of 2.5 μ m, is also referred to as and can goes into the lung particle.Though he is a content component seldom in the earth atmosphere composition, he has significant effects to air quality and visibility etc.Compare with thicker Atmospheric particulates, the PM2.5 particle diameter is little, be rich in a large amount of poisonous, harmful substance, and the time of staying in atmosphere is long, fed distance is far away, thereby bigger to the influence of health and atmosphere quality.
In the period of 2000-2007, the annual industrial fumes discharge capacity of China is all above 8,000,000 tons (about 4,000,000 tons of thermoelectricity industries), wherein minuteness particle (PM10, PM2.5) about 4,000,000 tons (the thermoelectricity industry is above 3,000,000 tons).
Traditional ESP can only collect the above dust granules of PM10, and sack cleaner can be collected the micronic dust of PM2.5, but there is following shortcoming in it:
(1) be inappropriate for operation work under the condition of high temperature, moisture is important to surpass 25% when above when dust in the flue gas contains, and dust is prone to the stifled bag of sticking bag, causes cloth bag deashing difficulty, resistance to raise, and premature failure is damaged;
(2) it is big slightly to compare drag losses with electric precipitation, is generally 1000-2000Pa;
(3) when burning high-sulfur cigarette or flue gas without apparatus processes such as desulfurization, when flue gas sulphur oxide, oxynitride concentration are very high, except that the FE filtrate, the damage that all can be corroded of other chemical fibre synthetic fiber filter materials, the cloth bag lost of life;
(4) can not under " dewfall " state, work;
(5) the cloth bag renewal cost is high.
Electrostatic precipitator, sack cleaner or electricity bag convolution deduster are generally adopted in thermal power plant's dedusting.
The principle of electrostatic precipitator is:
The highfield that utilizes high-voltage DC power supply to produce makes and contains electronegative gas (for example O2, SO2, C12, NH3, H2O etc.) ionization in the flue gas; Produce corona discharge; And then make the dust that is suspended in the gas charged; And charged dust is arrived on the electrode opposite polarity with it, thereby realize the purpose that dust suspension is separated from gas.
The advantage of electrostatic precipitator is:
(1) efficiency of dust collection can reach 98%-99%;
(2) in electric cleaner, the energy that grit separates from air-flow is not to supply with air-flow, but directly supplies with grit, therefore, compares with other high-efficiency dust remover.The resistance of electric cleaner is lower, is merely 100-200Pa;
(3) can handle high temperature ('s below 400 ℃) gas;
(4) be applicable to large-scale engineering, the gas flow of processing is bigger, and its economic effect more obviously.
The principle of sack cleaner is:
Dust-contained airflow gets into the cylindrical shape filter bag from the bottom, when passing through the hole of filtrate, dust is got off by the filtrate detention, and the cleaning gas tream that sees through filtrate is discharged by air-purifying chamber.Be deposited on the dust layer on the filtrate, under the effect of mechanical oscillation, split away off, fall into ash bucket from filter material surface.
The advantage of sack cleaner is:
(1) efficiency of dust collection is high, and generally more than 99%, the dust content that can reach the gas in the deduster exit is 20-30mg/Nm3, and the thin dirt of sub-micron particle diameter is had higher grade dust-collection efficiency;
(2) relatively simple for structure, convenient operating maintenance;
(3) insensitive to the dust characteristic, do not receive the influence of dust specific resistance;
(4) when the synthetic fibers that adopt glass fibre and some kind are made filter bag, can stable operation under 160-200 ℃ temperature, when selecting the high-performance filtrate, some heatproof can reach 260 ℃;
(5) when being used for dry method desulfuration system, can suitably improve desulfuration efficiency;
(6) scope of processing gas flow is big, and can handle the very dusty gas of high concentration, so it can be used as the deduster of various dusty gases.Its capacity can be less than to per minute number cubic metre, arrive the air-flow of hundreds thousand of cubic metres of per minutes greatly; When adopting highdensity synthetic fibers filter bag and pulse recoil purge mode; It can handle the dusty gas that dust concentration surpasses 700000mg/m3; It both can be used for the dust removal by ventilation in dirt source, and to the dedusting such as dusty gas in the various technical process such as cement, carbon black, pitch, lime, gypsum, chemical fertilizer, to reduce the discharging of dust pollution thing.
Yet, along with the raising of national environmental standard, depend merely on the requirement that electric precipitation can not satisfy environmental protection standard fully, the increase sack cleaner receives intrinsic restrictions such as the unit air-introduced machine is exerted oneself, space again and has problems such as difficult design.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art; The purpose of the utility model is to provide a kind of PM2.5 micronic dust electric cleaner; Can realize catching the purpose of the subparticle below the PM2.5; Can realize long period, the effect that maintenance cost is low again, and then it is big to solve thermoelectricity industry fine dust discharge capacity, the problem of threatening environment.
In order to solve the problems of the technologies described above, the technical scheme that the utility model adopts is:
A kind of PM2.5 micronic dust electric cleaner is arranged at after the conventional electric dust removing system, comprises the coalescence district 18, water conservancy diversion district 19 and the membrane type electrostatic precipitation district 20 that are communicated with successively, wherein:
Water conservancy diversion district 19 is communicated with coalescence district 18, is provided with a plurality of deflectors 9 perpendicular to the micronic dust direction in the water conservancy diversion district 19, and the side of deflector 9 makes and distinguishes coalescence with the micronic dust of different electric charges at this towards the micronic dust direction;
Membrane type electrostatic precipitation district 20 is communicated with water conservancy diversion district 19; Membrane type electrostatic precipitation district 20 is provided with a plurality of equally spaced films 10 that gather dust; The adjacent formation charged micronic dust passage 11 consistent between the film 10 that gather dust with the micronic dust direction; Be provided with a plurality of cathodic discharge utmost points 12 in each charged micronic dust passage 11, make charged micronic dust behind the coalescence film 10 that gathered dust in this district catch.
The said film 10 that gathers dust is provided with polypropylene screen 14 by conducting film 13 respectively at upper and lower surface and forms.
20 bottoms, said membrane type electrostatic precipitation district are communicated with ash bucket 15.
20 tops, said membrane type electrostatic precipitation district are provided with the film take-up device 16 that gathers dust.
The utility model compared with prior art has the following advantages:
1) mode of employing electrostatic precipitation is effectively caught the micronic dust below the PM2.5.
The present technique method is in former electric field arranged downstream coalescence district, because the positive and negative electrode separation in coalescence district, therefore; Flying dust will obtain positive charge and negative electrical charge respectively in its passage separately, the particle that carries positive and negative charge in downstream after deflector mixes coalescence, the dust behind the coalescence is caught by the film electrostatic precipitator; Tunica fibrosa has the capturing efficiency about 99.9% for the particle below the PM2.5, when dust runs up to certain thickness, when generally being about 5mm; Film stretching device starts, and makes the flying dust layer bear very big shearing force, when the flying dust layer receives shearing force; Film can fragment into a lot of fragments, fall into ash bucket then, because need not be provided with parts such as reinforcement; Therefore staubosphere can not fragment into very little fragment, and the possibility of being carried discharging once more reduces, thereby has also improved efficiency of dust collection.
This technical method need take into full account the dust charge electrical characteristics, designs the suitable high frequency electric source and the arrangement in coalescence district, and the effect of deflector is with charged mix dust and coalescence, for follow-up dedusting provides condition.The film electrostatic precipitator is easy to install and the location because material is light, and the requirement of setting accuracy is also so strict unlike the conventional electrostatic deduster, and therefore, as long as the coalescence district is reasonable in design, tunica fibrosa is selected correct, just can guarantee the efficiency of dust collection more than 99.9%.
2) investment cost is low, and operation, maintenance cost is also low.
For 300MW boiler unit, the high frequency electric source of coalescer is 25KW, and power consumption is low.Coalescer is arranged in former electric field downstream, adds the baffle upper plate flue gas resistance less than 200Pa, characteristics such as anticorrosive owing to having, the anti-combustion of tunica fibrosa, and the life-span is several times even tens times of cloth bag, so the maintenance operation cost in its later stage is all very low.
The quality of film electrostatic precipitator is about one of percentage of conventional electrostatic deduster, and mounting cost also is lower than the conventional electrostatic deduster, and therefore, the improvement expenses that increases the traditional electrical deduster is low.The expense of each cloth bag is about 1000 yuan, and for the 300MW unit, a tablecloth bag dust collector has 600 cloth bags approximately, and therefore only the cloth bag investment is about 6,000,000 yuan, and afterbody adopts the film electrostatic precipitation to use the tunica fibrosa of 1700m2 approximately, and the price of tunica fibrosa is 450 yuan/m
2, therefore, transforming a required expense of 300MW boiler unit is 76.5 ten thousand yuan.
Description of drawings
Fig. 1 is the utility model structural representation, and arrow is the flow direction of micronic dust among the figure.
Fig. 2 is that A-A is to view among Fig. 1, and arrow is the flow direction of micronic dust among the figure.
Fig. 3 is the utility model membrane plane figure that gathers dust.
Fig. 4 is the utility model film cutaway view that gathers dust.
The specific embodiment
Specify the embodiment of the utility model below in conjunction with accompanying drawing and embodiment.
As depicted in figs. 1 and 2, be the utility model structural representation, arrow is the flow direction of micronic dust among the figure; Micronic dust enters into conventional electric dust removing system from import smoke box 1, and this routine electric dust removing system comprises a former electric field 2, former two electric fields 3; Former three electric fields 4 and 5 four former electric fields of former four electric fields; Micronic dust removes most of oarse-grained dust through behind this routine electric dust removing system, enters into coalescence district 18 then.
Water conservancy diversion district 19 is communicated with coalescence district 18; Water conservancy diversion district 19 is provided with a plurality of deflectors 9 perpendicular to the micronic dust direction; The side of deflector 9 is towards the micronic dust direction, makes that the micronic dust with different electric charges becomes bulky grain at this district coalescence, and adjacent deflector 9 can connect together side and correspond to the direction in micronic dust entering water conservancy diversion district; Can make that the coalescence effect is better, entered into membrane type electrostatic precipitation district 20 subsequently by the bulky grain of coalescence.
Membrane type electrostatic precipitation district 20 is communicated with water conservancy diversion district 19; Membrane type electrostatic precipitation district 20 is provided with a plurality of equally spaced films 10 that gather dust, and the structure of the film 10 that gathers dust such as Fig. 3 and shown in Figure 4 are provided with polypropylene screen 14 by conducting film 13 respectively at upper and lower surface and form; Conducting film 13 has carried the performance that stretches; Polypropylene screen 14 has microcellular structure, has strengthened the micronic dust efficiency of dust collection, has guaranteed efficiently removing PM2.5 and following micronic dust.20 tops, membrane type electrostatic precipitation district are provided with the film take-up device 16 that gathers dust, and the film take-up device 16 that gathers dust connects the film 10 that gathers dust, and can realize reeling to the film 10 that gathers dust in vertical direction, change the lax or tensioning state of the film 10 that gathers dust.
Adjacent gathering dust formed consistent charged micronic dust passage 11 with the micronic dust direction between the film 10; Be provided with a plurality of cathodic discharge utmost points 12 in each charged micronic dust passage 11, make the bulky grain that enters into this district charged, when normal operation is gathered dust; Gather dust film place 10 in relaxed state; Adsorb a large amount of charged bulky grains, when micronic dust thickness acquires a certain degree on the film 10 that gathers dust (generally can be set to 5mm), the film take-up device 16 that gathers dust is started working; After the film 10 that gathers dust receives tensile force; Micronic dust layer on it receives the ash bucket 15 of bottom, shearing force effect landing to membrane type electrostatic precipitation district, is delivered to grey storehouse through the flying dust transport then, and the flue gas after the completion dedusting has outlet smoke box 17 to discharge.After the dedusting, the film take-up device 16 that the gathers dust film 10 that will gather dust is put back to relaxed state and is continued to gather dust.
Claims (4)
1. a PM2.5 micronic dust electric cleaner is arranged at after the conventional electric dust removing system, it is characterized in that, comprises the coalescence district (18), water conservancy diversion district (19) and the membrane type electrostatic precipitation district (20) that are communicated with successively, wherein:
Coalescence district (18) and conventional electric dust removing system conducting; Be provided with equally spaced a plurality of dust collection plate (6) in the coalescence district (18); Form the micronic dust passage (7) consistent between the adjacent dust collection plate (6) with the micronic dust direction; Be provided with in the same micronic dust passage (7) perpendicular to micronic dust direction and the identical discharge electrode (8) of polarity, the polarity of the adjacent interior discharge electrode of micronic dust passage (7) (8) is opposite, makes through different electric charge on the micronic dust band in this district;
Water conservancy diversion district (19) is communicated with coalescence district (18), is provided with a plurality of deflectors perpendicular to the micronic dust direction (9) in water conservancy diversion district (19), and the side of deflector (9) makes and distinguishes coalescence with the micronic dust of different electric charges at this towards the micronic dust direction;
Membrane type electrostatic precipitation district (20) is communicated with water conservancy diversion district (19); Membrane type electrostatic precipitation district (20) is provided with a plurality of equally spaced films that gather dust (10); Form the charged micronic dust passage (11) consistent between the adjacent film that gathers dust (10) with the micronic dust direction; Be provided with a plurality of cathodic discharge utmost points (12) in each charged micronic dust passage (11), make charged micronic dust behind the coalescence film (10) that gathered dust in this district catch.
2. PM2.5 micronic dust electric cleaner according to claim 1 is characterized in that, the said film that gathers dust (10) is provided with polypropylene screen (14) by conducting film (13) respectively at upper and lower surface and forms.
3. PM2.5 micronic dust electric cleaner according to claim 1 is characterized in that, bottom, said membrane type electrostatic precipitation district (20) is communicated with ash bucket (15).
4. PM2.5 micronic dust electric cleaner according to claim 1 is characterized in that, top, said membrane type electrostatic precipitation district (20) is provided with the film take-up device (16) that gathers dust.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220143447 CN202606281U (en) | 2012-04-06 | 2012-04-06 | Electric deduster for PM2.5 micronic dust |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220143447 CN202606281U (en) | 2012-04-06 | 2012-04-06 | Electric deduster for PM2.5 micronic dust |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202606281U true CN202606281U (en) | 2012-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220143447 Expired - Lifetime CN202606281U (en) | 2012-04-06 | 2012-04-06 | Electric deduster for PM2.5 micronic dust |
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| Country | Link |
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| CN (1) | CN202606281U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102631989A (en) * | 2012-04-06 | 2012-08-15 | 中国华能集团清洁能源技术研究院有限公司 | Electric mote remover |
-
2012
- 2012-04-06 CN CN 201220143447 patent/CN202606281U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102631989A (en) * | 2012-04-06 | 2012-08-15 | 中国华能集团清洁能源技术研究院有限公司 | Electric mote remover |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121219 |