CN105194960A - Integrated treatment device for removing PM2.5 and heavy metal particulate matter in exhaust gas - Google Patents
Integrated treatment device for removing PM2.5 and heavy metal particulate matter in exhaust gas Download PDFInfo
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- CN105194960A CN105194960A CN201510536397.0A CN201510536397A CN105194960A CN 105194960 A CN105194960 A CN 105194960A CN 201510536397 A CN201510536397 A CN 201510536397A CN 105194960 A CN105194960 A CN 105194960A
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- metal particles
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Abstract
The invention relates to an integrated treatment device for removing PM2.5 and heavy metal particulate matter in exhaust gas. The integrated treatment device comprises a primary purifying device and a secondary purifying device. The primary purifying device comprises a purifying tank with the upper end opened, and a spraying device is arranged in the purifying tank. A wet-type electric dust remover is arranged in a dust removal cavity, and a first gas outlet is formed in the upper end of the dust removal cavity. The secondary purifying device comprises a purifying barrel with the upper end opened and a drainage gas hood with the upper end opened. The purifying barrel is filled with second absorption liquid, an inlet of the drainage gas hood is communicated with a first outlet pipeline, and the opening of the drainage gas hood is formed in the purifying barrel and located in the second absorption liquid. Based on wet-type dust removal, two stages of disposers are adopted in the device, the PM2.5 contained in the exhaust gas can be well removed while the heavy metal particulate matter of the exhaust gas is treated, and the technical support is provided for establishing the atmospheric emission standards of exhaust gas emission enterprises of the same kind.
Description
Technical field
The present invention relates to PM2.5 and heavy metal particles thing integrated treatment unit in a kind of removal waste gas.
Background technology
The research of the removal technology of fine particle PM2.5 and heavy metal particles thing is devoted to for the increasing researcher of day by day serious pollution situation.Recognized technology mainly concentrates on following 3 kinds of methods in the world at present: improve bag-type dust, wet dust removal, electric bag composite dedusting.Improve that the dust settling pocket technique removal efficiency that is greater than 2 μm to particle diameter is very high, this technical stability strong, wide accommodation, but higher to the temperature of flue gas, humidity requirement, and the pressure loss is serious, and the shortcomings such as energy consumption is larger are restricted in engineer applied.Electricity bag composite dedusting technology is a kind of novel dust collecting process, and this technique is in conjunction with the advantage of electric precipitation and bag-type dusting, but accessory system is complicated, in maintenance and the management aspect difficulty in later stage, and maturation not enough on engineering application.Though sack cleaner, electric-bag complex dust collector efficiency of dust collection are high, its operation stability and security need to study textual criticism further, and the disadvantages affect such as the pressure loss is large, life-span of the filter bag is short, broken bag its apply in engineering.Wet dust removal then overcomes the shortcoming of conventional electric precipitation at the trapping weak effect of fine dust, humidity, stickiness, high resistivity dust, and the deashing property that wet-esp has also had, high treatment efficiency, utilization industry are extensively, affect the advantages such as little by operating mode factor.Production scale and the usage quantity of current China electric precipitation all occupy first place in the world, and electrostatic precipitation technology is close to advanced international standard.The dedusting method of thermal power plant, coal-burning boiler and oil burning boiler is based on electric precipitation, and it accounts for 82% of dedusting method.
Fine particle, because specific area is large, can adsorb a lot of poisonous and hazardous material, wherein just has a lot of heavy metal to adhere on it.The domestic and international removal main method for heavy metal particles thing has at present: selective catalytic reduction (SCR), absorption method and wet pretreatment method 3 kinds of methods.Though SCR technology has high removal efficiency, it may produce secondary pollution, invest the fatal defects such as huge, fewer and feweri by engineering application.For the absorption method technology that treating capacity is larger, because it is only suitable for low concentration heavy metal water process, causes this technique to be applicable to engineering type less, also will slowly be replaced by new technology.Wet pretreatment method removes the method for waste gas heavy metal relatively preferably, leached by washing, chemical reaction is utilized to make poisonous and harmful substance change the process of low-solubility, low migration and hypotoxic material into, be suitable for industry wide wide, according to selecting different absorbing liquids, can adsorb different heavy metal, can apply in a flexible way in the removal of various waste gas heavy metal.
≤ 50mg/m3 is revised based on the dust of Chinese coal fired boiler of power plant, cement industry, dust concentration national standard, the provincial standard of part coastal economy developed regions is modified to≤30mg/m3, new standard is for the air contaminant treatment of China, especially removing of superfine particulate matter proposes huge challenge, and most of industrial and mining enterprises of China to treat the process of waste gas all very single, seldom have the equipment taking into account several different pollutants.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, and provide a kind of and remove PM2.5 and heavy metal particles thing integrated treatment unit in waste gas, the equipment in the past that solves can not remove the defect of PM2.5 and heavy metal particles thing.
The technical solution adopted for the present invention to solve the technical problems is: PM2.5 and heavy metal particles thing integrated treatment unit in a kind of removal waste gas, comprise first class purification device and secondary purification device, the outlet of described first class purification device is communicated with the inlet ductwork of secondary purification device;
Described first class purification device comprises the purification tank of upper end open, the spray equipment for spraying the first absorbing liquid is provided with in described purification tank, the purification tank that purification tank below this spray equipment is formed above spray chamber, this spray equipment forms dedusting chamber, the sidewall in described spray chamber offers the first air inlet, arrange wet electrical dust precipitator in described dedusting chamber, the upper end in described dedusting chamber forms the first gas outlet being used for being communicated with secondary purification device;
Described secondary purification device comprises purifying tube and the drainage gas hood of upper end open, the second absorbing liquid is filled with in described purifying tube, the import of described drainage gas hood is communicated with the first export pipeline, the opening of described drainage gas hood is placed in purifying tube, and the opening of described drainage gas hood is placed in the second absorbing liquid.
Further, described wet electrical dust precipitator comprises dust collection plate, some coronas and electric control gear, and described electric control gear and each corona are formed and be electrically connected; Described wet electrical dust precipitator is provided with the spray deashing device for cleaning dust collection plate.
Further, spiral board is provided with below described spray equipment.
Further, the bottom of described purification tank is provided with the reservoir of storage first absorbing liquid, the import of described spray equipment and reservoir pipeline connection.
Further, described drainage gas hood is vertically arranged down, is provided with cone in described drainage gas hood, described cone is connected with ft connection, for supplementing the liquid supplementation pipe of the second absorbing liquid in purifying tube.
Further, be provided with screen deck net in described purifying tube, described screen cloth is micrometer grade hole seam screen deck net, and described screen deck net is positioned at the top of drainage gas hood outlet.
Further, the sidewall of described purifying tube is also provided with the overflow pipe for maintaining the second absorbing liquid liquid level in purifying tube.
Further, the upper end of described purifying tube is also provided with top cylinder, and described top cylinder lower end import is communicated with purifying tube upper end open, and described top cylinder upper end connects escape pipe; The inner chamber medium dip of described top cylinder is provided with backflow liquid barrier, and the bottom of described backflow liquid barrier connects return duct, described return duct and purifying tube inner space; The upper end of described backflow liquid barrier is also provided with dehumidifier.
Further, the escape pipe that described top cylinder upper end connects and chimney pipeline connection, the pipeline between top cylinder and chimney is provided with air-introduced machine.
Further, the first described absorbing liquid is NaOH ﹢ CaO ﹢ Na2CO3; The second described absorbing liquid is Na2S ﹢ NaOH.
The invention has the beneficial effects as follows: this device is on the basis of wet dust removal, adopt two-stage disposer, while process waste gas heavy metal particles thing to waste gas in the PM2.5 that contains also have good removal effect, and provide technical support for the formulation of the atmospheric emission standard of similar toxic emission enterprise.
By research and development and the popularization of this device, the discharge to atmospheric environment of PM2.5, heavy metal contaminants and sour gas effectively can be reduced.
Adopt spiral board to realize mixing of liquid phase with the unique design of spray thrower, make subparticle in gas be combined with moisture more even.Mixed liquid phase Small molecular medium will be that condensation nucleus forms fine liquid particles with fine particle, and these are that the little water droplet of core coalescence can occur with particle, and fine particle thing assembles larger particle.Particle after coalescence comprises after certain moisture enters electric dust collector, is more easily caught by electric field force and overcomes the defect of traditional electrical dedusting technology in fine particle process.Dust simultaneously containing large quantity of moisture will form mud and be easy to collect, and overcomes beaing of dry method electric precipitation later stage, avoids reentrainment of dust, improves absorption efficiency.
System with spiral board, micrometer grade hole seam screen deck net for core, the design of this uniqueness of micrometer grade hole seam screen deck net is adopted in secondary purification device, contact area between gas after removing PM2.5 and liquid is increased greatly, and gas can fully contact with liquid.Take liquid as continuous phase, gas is decentralized photo.Reduce the resistance of gas-liquid mass transfer, the energy consumption decreased in mass transport process, improve removal efficiency, reduce energy consumption, simultaneously because the internal structure of its uniqueness makes the floor space of device, humidity of flue gas, SR all less, device can according to the convenient adjustment of different production environment and dismounting, the cyclic utilization rate of system is high, greatly reduces removal cost.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1 is the schematic diagram of integrated treatment unit of the present invention;
Wherein, 1, purification tank, 2, purifying tube, 3, spray equipment, 4, corona, 5, dust collection plate, 6, deashing device is sprayed, 7, spiral board, 8, reservoir, 9, drainage gas hood, 10, liquid supplementation pipe, 11, screen deck net, 12, overflow pipe, 13, backflow liquid barrier, 14, return duct, 15, dehumidifier, 16, chimney.
Detailed description of the invention
The present invention is further illustrated in conjunction with specific embodiments now.The schematic diagram that these accompanying drawings are simplification only illustrates basic structure of the present invention in a schematic way, and therefore it only shows the formation relevant with the present invention.
As shown in Figure 1, PM2.5 and heavy metal particles thing integrated treatment unit in a kind of removal waste gas, comprise first class purification device and secondary purification device, the outlet of first class purification device is communicated with the inlet ductwork of secondary purification device.
First class purification device comprises the purification tank 1 of upper end open, and spray equipment 3, first absorbing liquid be provided with in purification tank 1 for spraying the first absorbing liquid is NaOH ﹢ CaO ﹢ Na2CO3; The purification tank 1 that purification tank 1 below this spray equipment 3 is formed above spray chamber, this spray equipment 3 forms dedusting chamber, and the sidewall in spray chamber offers the first air inlet, and the first air inlet connects the first inlet pipe, the first inlet pipe is arranged air pump and introduces for processing waste gas; Dedusting arranges wet electrical dust precipitator in chamber, and the upper end in dedusting chamber forms the first gas outlet being used for being communicated with secondary purification device.
Secondary purification device comprises purifying tube 2 and the drainage gas hood 9 of upper end open, the second absorbing liquid is filled with in purifying tube 2, the import of drainage gas hood 9 is communicated with the first export pipeline, and the opening of drainage gas hood 9 is placed in purifying tube 2, and the opening of drainage gas hood 9 is placed in the second absorbing liquid.Second absorbing liquid is Na2S ﹢ NaOH.
Wet electrical dust precipitator comprises dust collection plate 5, some coronas 4 and electric control gear, and electric control gear and each corona 4 are formed and be electrically connected; Wet electrical dust precipitator is provided with the spray deashing device 6 for cleaning dust collection plate 5.
For making acidic components, dust, aerosol, PM2.5 and the part heavy metal particles things such as the SO2 in waste gas fully be caught and absorb, below spray equipment 3, be provided with spiral board 7.By spiral board 7, waste gas is fully absorbed with the first absorbing liquid.
The bottom of purification tank 1 is provided with the reservoir 8 of storage first absorbing liquid, the import of spray equipment 3 and reservoir 8 pipeline connection.The arranging of reservoir 8 can make spray equipment 3 recycle the first absorbing liquid in reservoir 8.
Drainage gas hood 9 is vertically arranged down, is provided with cone in drainage gas hood 9, cone is connected with ft connection, for supplementing the liquid supplementation pipe 10 of the second absorbing liquid in purifying tube 2.
Be provided with screen deck net 11 in purifying tube 2, screen cloth is micrometer grade hole seam screen deck net, and screen deck net 11 is positioned at the top that drainage gas hood 9 exports.Arranging of screen deck net 11 can abundant refinement air-flow, Small molecular air-flow is fully contacted again with the second absorbing liquid, and carries out seizure to heavy metal particles thing most in particulate matter and process further.
The sidewall of purifying tube 2 is also provided with the overflow pipe 12 for maintaining the second absorbing liquid liquid level in purifying tube 2.
The upper end of purifying tube 2 is also provided with top cylinder, and the import of top cylinder lower end is communicated with purifying tube 2 upper end open, and top cylinder upper end connects escape pipe; The inner chamber medium dip of top cylinder is provided with backflow liquid barrier 13, and the bottom of backflow liquid barrier 13 connects return duct 14, return duct 14 and purifying tube 2 inner space; The upper end of backflow liquid barrier 13 is also provided with dehumidifier 15.
The main purpose that backflow liquid barrier 13 and dehumidifier 15 are arranged is, controls the humidity of Exhaust Gas.
The escape pipe that top cylinder upper end connects and chimney 16 pipeline connection, the pipeline between top cylinder and chimney 16 is provided with air-introduced machine.Gas after filtration, under the effect of air-introduced machine, slowly discharges to atmospheric environment from chimney 16.
The course of work of apparatus of the present invention is specially: waste gas enters in spray chamber through the first air inlet, through spiral board 7 and spray equipment 3, waste gas is fully contacted with the first absorbing liquid, then liquid phase medium enters wet electrical dust precipitator, electric control gear controls corona 4 and discharges, make the PM2.5 in flue gas, heavy metal particles aerosol and steam particle etc. charged, pollutant charged under the effect of electric field force is deposited on dust collection plate 5, and makes mud fall to entering recovery channel by spray deashing device 6.
Waste gas is discharged through the first outlet, enter in purifying tube 2 through drainage gas hood 9, because drainage gas hood 9 is placed in the second absorbing liquid, waste gas can be made fully to contact with the second absorbing liquid, and through screen deck net 11 refinement air-flow, make contact more from dividing, gas escapes and enter in top cylinder from purifying tube 2 upper end afterwards, and the backflow liquid barrier 13 in top cylinder and dehumidifier 15 control the humidity of gas.
Below enumerate two cases:
Case 1:
The waste gas that certain chemical enterprise is discharged contains the fine particle (PM2.5 and be attached with heavy metal Pb particle) of high concentration, adopts this device, in removal waste gas, can also have good removal effect by heavy metal particle while fine particle.After first class purification device, make PM2.5 concentration in waste gas be 63ug/m3, clearance, up to 92%, reaches new ambient air quality (GB3095-2012) secondary discharge standard; Be 0.9ug/m3 by Pb content in waste gas after secondary purification device, clearance, up to 85%, reaches new ambient air quality too.
Case 2:
Pollute containing a large amount of heavy metal (Cd, Hg) particles and PM2.5 in the industrial waste gas that certain cell production companies is discharged, after the first class purification of device and secondary purification, after third party's check processing, Cd, Hg concentration is respectively 0.0048ug/m3,0.035ug/m3, clearance is respectively 88%, 75%, PM2.5 and heavy metal particles thing are effectively removed, and treated waste gas all reaches the relevant emission standards (GB3095-2012) of national regulation to the requirement of air quality.
With above-mentioned according to desirable embodiment of the present invention for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this invention technological thought, can carry out various change and amendment completely.The technical scope of this invention is not limited to the content on description, must determine its technical scope according to right.
Claims (10)
1. remove PM2.5 and a heavy metal particles thing integrated treatment unit in waste gas, it is characterized in that, comprise first class purification device and secondary purification device, the outlet of described first class purification device is communicated with the inlet ductwork of secondary purification device;
Described first class purification device comprises the purification tank (1) of upper end open, the spray equipment (3) for spraying the first absorbing liquid is provided with in described purification tank (1), the purification tank (1) of this spray equipment (3) below forms spray chamber, the purification tank (1) of this spray equipment (3) top forms dedusting chamber, the sidewall in described spray chamber offers the first air inlet, arrange wet electrical dust precipitator in described dedusting chamber, the upper end in described dedusting chamber forms the first gas outlet being used for being communicated with secondary purification device;
Described secondary purification device comprises purifying tube (2) and the drainage gas hood (9) of upper end open, described purifying tube is filled with the second absorbing liquid in (2), the import of described drainage gas hood (9) is communicated with the first export pipeline, the opening of described drainage gas hood (9) is placed in purifying tube (2), and the opening of described drainage gas hood (9) is placed in the second absorbing liquid.
2. PM2.5 and heavy metal particles thing integrated treatment unit in removal waste gas according to claim 1, it is characterized in that, described wet electrical dust precipitator comprises dust collection plate (5), some coronas (4) and electric control gear, and described electric control gear and each corona (4) are formed and be electrically connected; Described wet electrical dust precipitator is provided with the spray deashing device (6) for cleaning dust collection plate (5).
3. PM2.5 and heavy metal particles thing integrated treatment unit in removal waste gas according to claim 1, is characterized in that, described spray equipment (3) below is provided with spiral board (7).
4. PM2.5 and heavy metal particles thing integrated treatment unit in removal waste gas according to claim 1, it is characterized in that, the bottom of described purification tank (1) is provided with the reservoir (8) of storage first absorbing liquid, the import of described spray equipment (3) and reservoir (8) pipeline connection.
5. PM2.5 and heavy metal particles thing integrated treatment unit in removal waste gas according to claim 1, it is characterized in that, described drainage gas hood (9) is vertically arranged down, be provided with cone in described drainage gas hood (9), described cone is connected with ft connection, for the liquid supplementation pipe (10) of supplementing the second absorbing liquid in purifying tube (2).
6. PM2.5 and heavy metal particles thing integrated treatment unit in removal waste gas according to claim 5, it is characterized in that, screen deck net (11) is provided with in described purifying tube (2), described screen cloth is micrometer grade hole seam screen deck net, and described screen deck net (11) is positioned at the top that drainage gas hood (9) exports.
7. PM2.5 and heavy metal particles thing integrated treatment unit in removal waste gas according to claim 1, it is characterized in that, the sidewall of described purifying tube (2) being also provided with the overflow pipe (12) for maintaining the second absorbing liquid liquid level in purifying tube (2).
8. PM2.5 and heavy metal particles thing integrated treatment unit in removal waste gas according to claim 1, it is characterized in that, the upper end of described purifying tube (2) is also provided with top cylinder, described top cylinder lower end import is communicated with purifying tube (2) upper end open, and described top cylinder upper end connects escape pipe; The inner chamber medium dip of described top cylinder is provided with backflow liquid barrier (13), the bottom of described backflow liquid barrier (13) connects return duct (14), described return duct (14) and purifying tube (2) inner space; The upper end of described backflow liquid barrier (13) is also provided with dehumidifier (15).
9. PM2.5 and heavy metal particles thing integrated treatment unit in removal waste gas according to claim 8, it is characterized in that, the escape pipe that described top cylinder upper end connects and chimney (16) pipeline connection, the pipeline between top cylinder and chimney (16) is provided with air-introduced machine.
10. PM2.5 and heavy metal particles thing integrated treatment unit in removal waste gas according to claim 1, is characterized in that, the first described absorbing liquid is NaOH ﹢ CaO ﹢ Na2CO3; The second described absorbing liquid is Na2S ﹢ NaOH.
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| CN201510536397.0A CN105194960A (en) | 2015-08-27 | 2015-08-27 | Integrated treatment device for removing PM2.5 and heavy metal particulate matter in exhaust gas |
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| CN201510536397.0A CN105194960A (en) | 2015-08-27 | 2015-08-27 | Integrated treatment device for removing PM2.5 and heavy metal particulate matter in exhaust gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106224995A (en) * | 2016-07-27 | 2016-12-14 | 太仓旺泰净化设备有限公司 | A kind of high temperature flue-gas from boiler purifier and purification method thereof |
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Application publication date: 20151230 |