CN104258994A - Coagulation method and device of desulfurized wet flue gas tiny dust - Google Patents
Coagulation method and device of desulfurized wet flue gas tiny dust Download PDFInfo
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- CN104258994A CN104258994A CN201410377873.4A CN201410377873A CN104258994A CN 104258994 A CN104258994 A CN 104258994A CN 201410377873 A CN201410377873 A CN 201410377873A CN 104258994 A CN104258994 A CN 104258994A
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- flue gas
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- micronic dust
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Abstract
The invention discloses a coagulation method and device of desulfurized wet flue gas tiny dust, belongs to the technology of flue gas purification, and particularly relates to a method and device which can separately remove fine particles in flue gas. According to the method, a tiny dust coagulation device is arranged on a gas duct between a desulfurizing tower flue gas purifying outlet and a deep purifying device, a micro fog nozzle is used, water and compressed air double-fluid spraying is adopted, PM 2.5 level tiny particulate matter in the flue gas collides with fog drops and is coagulated into the fog drops, in the dust particle coagulation process, the fog drops are increased, the mean grain size of coagulated water drops is 60 micrometers, the water drops are charged in a high-voltage electric field of the deep purifying device, and are driven to an anode under the action of corona discharge electric field force, the water drops are attached to the surface of the anode and can rapidly release charges, a large number of water drops are continuously attached to the surface of the anode, when the thickness of a water film exceeds 125 micrometers, the water film flows downwards by means of gravity center of water along the inner wall of an anode plate to fall into a slurry pool, and the content of the dust in the treated flue gas is reduced to be within 5 mg/Nm<3>.
Description
Technical field
The invention belongs to flue gases purification, particularly can be separated the method and device of removing fine particle in flue gas.
Background technology
Because the harm of fine dust to health is huge, thus very high requirement is proposed to the performance of deduster, require also improving year by year to enterprise's dust emission standard.The treatment effect of original cleaner has not reached the requirement of existing standard, and for some power plant of qualified discharge, steel mill change original three E field electrostatic precipitator as four electric fields into, some enterprises then change electrostatic precipitator as sack cleaner into.These transformations can only be significantly improved to dry flue gas dedusting, can reach 30mg/m
3.But flue gas is through desulfurizing tower, by desulfurization slurry [calcium carbonate (CaCO
3) or calcium oxide (CaO)] washing, be stripped of the sulfur dioxide (SO in flue gas
2), make the dry flue gas of about 150 DEG C become the wet flue gas of about 55 DEG C.Flue gas falls in process at temperature, absorbs the moisture in slurries, with certain enterprise 600m
2sintering machine is example, and the water yield of evaporation per hour from slurries is 132 tons.Also a part of calcium sulphate dihydrate (CaSO is taken away in slurries evaporation process
42H
2o).Generally, the dust content (flue dust adds calcium sulphate dihydrate) after wet desulphurization is at 70mg/m
3left and right, beyond discharge standard that is national and Shandong Province.Want the particle removed in flue gas after desulfurization and just must develop corresponding new technology with new thinking.
CN 102961943 A discloses a kind of method and apparatus of wet process of FGD cooperation-removal subparticle, simply transform in the clean flue of the desulfurization of this removal methods to wet desulphurization equipment, set up steam phase transforming district and make subparticle condensation growth, with foundation collision condensation region, subparticle is condensed further to grow up, the fine particle of last flue demister to condensation growth effectively catches, and then discharges from flue outlet.The method only can reach; After treatment, chimney breast cigarette temperature is 49 DEG C to flue gas, and gas and dust characters is 28mg/Nm
3, reach the smoke dust discharge concentration that " thermal power plant's air pollution emission standard " (GB13233-2011) specify and be less than 30mg/Nm
3discharge standard,
Within 2012, applicant is first patent 201220493828.1 " wet type sintering desulfuration flue gas device for deep cleaning " (hereinafter referred to as device for deep cleaning).This device operation principle adopts dust in high-pressure electrostatic ionization flue gas charged, and driving into lower transverse shifting and being attached on positive plate at electric field force after dust is charged, makes particle in flue gas no longer with flow of flue gas.When the dust on positive plate reaches certain thickness, rinse with water and make dust mix with water also to trickle under gravity and arrive slurry pool.This device puts into operation over 3 years, and efficiency of dust collection is more than 90%, and the dust content after wet type device for deep cleaning is all at 20mg/Nm
3within, reach the discharge standard at a specified future date of country and Shandong Province.But there is the high-tension electricity of 60Kv-80Kv during the work of this device in system, during charged flushing, make negative electrode and anode in short circuit, electric power system trip.Need have a power failure in advance during normal flushing, power transmission again after flushing.Between flush period, device for deep cleaning is that idle wet-esp that makes is in intermittent operation, is not inconsistent with environmental requirement.
Summary of the invention
Need to use water flushing positive plate to make the deficiency of wet-esp discontinuous to overcome in prior art, the object of this invention is to provide a kind of wet flue gas micronic dust coalescence method after desulfurization, another object of the present invention is to provide the device of wet flue gas micronic dust coalescence after the desulfurization implementing the method.
Technical scheme of the present invention is, after a kind of desulfurization, wet flue gas micronic dust coalescence method, is characterized in that: comprise the steps:
A. flue gas is after desulfurizing tower wet type desulfurizing, enter flue gas micronic dust coalescence device and use Fine-fog nozzle, this nozzle adopts water and compressed air two-fluid spray, the pressure design of water and air in shower nozzle is 0.4MPa, the droplet average grain diameter of ejection is 60 μm, maximum particle diameter is 150 μm, droplet and flue gas flow direction 90 ° of angles are tangent to be mixed, the fine particulates of PM2.5 level and droplet collide coalescence in droplet in this process, droplet can coalescence several ten thousand fine soot particles, droplet is also increasing in coalescence grit process, water droplet particle Ke≤40 μm after coalescence, its average grain diameter 60 μm,
B. the gas after coalescence enters wet type sintering desulfuration flue gas deep purifying device, water droplet particle after coalescence is charged in high voltage electric field, and anode is driven under the electric field force effect of corona discharge, electric charge can be discharged rapidly after water droplet is attached to anode surface, a large amount of water droplet successively clings to anode surface, and anode surface maximum adsorption water film thickness is 125 μm, when water film thickness surpasses this thickness, to trickle downwards along positive plate inwall by the gravity of water and fall into slurry pool
C. the flue gas after steps A, B process enters chimney discharge, and dust content can drop at 5mg/Nm
3within.
Wet flue gas micronic dust coalescence device after the desulfurization that after desulfurization, wet flue gas micronic dust coalescence method uses, it is characterized in that: after desulfurization, wet flue gas micronic dust coalescence device can be arranged on the flue that desulfurizing tower neat stress is exported between wet type sintering desulfuration flue gas device for deep cleaning, the rounded array distribution of micronic dust coalescence device case periphery the Fine-fog nozzle that 8-16 levels are installed, flange on Fine-fog nozzle is connected with the adapter bolt with flange being arranged on micronic dust coalescence device case periphery, Fine-fog nozzle water receiving joint is connected with high service pipeline by annular water supply line, Fine-fog nozzle pneumatic fitting is connected with compressed air piping by annular steam line.
Described micronic dust coalescence device case bottom is connected to the gas vent of wet type desulfurizing top of tower, before this housing tip is connected with the gas feed bottom deep purifying device and is positioned at gas distribution grid.
Described Fine-fog nozzle water receiving joint and by being equipped with Fine-fog nozzle water supply valve between annular water supply line, is equipped with Fine-fog nozzle air-supplying valve between Fine-fog nozzle pneumatic fitting and annular steam line.
Described high service pipeline is equipped with electromagnetic flowmeter and water supply electric control valve, described compressed air piping is equipped with vortex-shedding meter and air feed electric control valve.
The invention has the beneficial effects as follows
1. realize coal smoke minimum discharge
Improve flue gas device for deep cleaning efficiency of dust collection, make this device by present smoke discharge amount 20mg/Nm
3drop to 5mg/Nm
3below, coal-fired flue-gas is made to reach combustion of natural gas discharge standard.
2. device for deep cleaning can be made to catch the dust of PM2.5 level
Although PM2.5 occupies the minority in flue dust total release, large number is accounted for the health hazard of human body.Because it can not be discharged into lung by breathing, be the arch-criminal causing lung and tracheal disease.Certain enterprise 600 operating condition of sintering machine exhaust gas volumn 3166953m
3/ h, adopts the honeycomb duct 2664 of the long 6m of inscribed circle 360mm.Particle diameter more than 10 μm dust granules can only be caught as flue gas flow rate 2.5m/s.Migration velocity through calculating electric field is 90mm/s.The dust granules migration velocity 22.5mm/s of PM2.5 level, the anode tube length 23 meters of needs is long.The tube bank of obvious 6 meters long is inoperative.As dust granules 40 μm, its migration velocity 360mm/s, needs anode tube length to be only 1.5 meters.As design flue gas flow rate 2.95m/s, maximum seizure dust diameter more than 12 μm under the electric field of 80Kv.If the dust wanting to catch PM2.5 level needs, anode tube length is the shortest also wants 27.27 meters, and this is structurally difficult to accomplish.
We adopt micronic dust device now, the dust coalescence of a lot of PM2.5 level in the globule of 60 μm, make migration velocity improve 24 times, and make anode tube contraction in length 24 times.After adding coalescence device theoretically, anode tube length is greater than 1.13 meters.
3. remarkable in economical benefits
(1) cost is saved
Certain enterprise 600 sintering machine device for deep cleaning former employing electroconductive frp honeycomb duct 2664, comprehensive cost 3,896 ten thousand yuan.After adding flue dust strengthening coalescence equipment, flue gas flow rate can bring up to 6m/s, only needs electroconductive frp honeycomb duct 1306, uses 1358 less.If require that system flow rate is constant, frp honeycomb length of tube shortens to 3 meters by present 6 meters.Comprehensive cost can save 50%, is about 1,948 ten thousand yuan.
(2) operating cost is saved
Certain enterprise 600 sintering machine device for deep cleaning first wife with constant-current high-voltage DC power supply 6, general power 1072Kw.After adopting coalescence equipment, dust high for ratio resistance rate is wrapped in the relatively little globule of ratio resistance rate, be conducive to the raising of migration velocity, purifier is run more reliable and more stable.Calculate by than line current, constant flow high pressure straight line power supply installed power also reduces 50%, i.e. 536kW.8000 hours running times, electricity charge unit price 0.78 yuan/kWh calculate per year, the annual saving electricity charge 334.46 ten thousand yuan.
(3) because efficiency of dust collection after the increase of micronic dust coalescence device is very high, to dust content before desulfurization at 150mg/Nm
3within three E field electrostatic precipitator, reach 5mg/Nm by coalescence device to deep purifying again by desulfurization and dedusting
3discharge capacity.For 180 sintering machines, change four electric field improvement expenses 1,650 ten thousand yuan into by three electric fields and just can save.
(4) the flush water pump flow 320m of wet type sintering desulfuration flue gas device for deep cleaning first wife
3/ h, lift 40m, power of motor 90kW, cancel after adding coalescence device.Newly-increased 1 pump capacity 6.3m
3/ h, lift 80m, power of motor 7.5kW.Newly-increased 1 screw-rod air compressor air quantity 780m
3/ h, blast 0.5MPa, power 60kW.Installed power 22.5kW is saved after setting up micronic dust coalescence device.Because raw water pump is interrupter duty, substantially identical before water, electric comprehensive energy consume, increases coalescence equipment and install additional.
Accompanying drawing explanation
Fig. 1 is flue gas of sintering machine dedusting overall technological scheme figure,
Fig. 2 is device for deep cleaning electroconductive frp honeycomb duct structural representation,
Fig. 3 is Fine-fog nozzle installation diagram in micronic dust coalescence device,
Fig. 4 is micronic dust coalescence device installation site schematic diagram,
Fig. 5 be the A-A of Fig. 4 to sectional view,
Fig. 6 be the B-B of Fig. 5 to sectional view,
Fig. 7 is water supply line equipment schematic diagram,
Fig. 8 is steam line equipment schematic diagram.
In figure, 1. sintering machine, 2. electric cleaner, 3. Sinter air machine, 4. desulfurization blower fan, 5. desulfurizing tower, 6 micronic dust coalescence devices, 7. device for deep cleaning, 8. chimney, 9. shower nozzle, 10. micronic dust coalescence device case, 11. adapters, 12. flanges, 13. packing rings, 14. bolts, 15. Fine-fog nozzles, 16. water receiving joints, 17. pneumatic fittings, 18. annular steam lines, 19. annular water supply lines, 20. Fine-fog nozzle air-supplying valves, 21. Fine-fog nozzle water supply valves, 22. supports, 23. dull and stereotyped demisters two layers, 24. dull and stereotyped demister one decks, 25. connect water pump interface, 26. electromagnetic flowmeters, 27. water supply electric control valves, 28. connect annular water supply line interface, 29. connect air accumulator pipeline, 30. vortex-shedding meters, 31. air feed electric control valves, 32. connect annular steam line interface
Detailed description of the invention
The specific embodiment of the present invention is, as shown in the figure:
Embodiment 1, wet flue gas micronic dust coalescence device after desulfurization, it is characterized in that: after desulfurization, wet flue gas micronic dust coalescence device 6 can be arranged in desulfurizing tower 5 neat stress and is exported on the flue between device for deep cleaning 7, the rounded array distribution of micronic dust coalescence device case 10 periphery the Fine-fog nozzle 15 that 8-16 levels are installed, flange on Fine-fog nozzle is connected with adapter 11 bolt 14 with flange 12 being arranged on micronic dust coalescence device case periphery, Fine-fog nozzle water receiving joint 16 is connected with high service pipeline by annular water supply line 19, Fine-fog nozzle pneumatic fitting 17 is connected with compressed air piping by annular air pipe 18.
Described micronic dust coalescence device case bottom is connected to the gas vent of wet type desulfurizing top of tower, before this housing tip is connected with the gas feed bottom device for deep cleaning and is positioned at gas distribution grid.
Between described Fine-fog nozzle water receiving joint and annular water supply line, Fine-fog nozzle water supply valve 21 is housed, Fine-fog nozzle air-supplying valve 20 is housed between Fine-fog nozzle pneumatic fitting and annular air pipe.
Described high service pipeline is equipped with electromagnetic flowmeter 26 and water supply electric control valve 27, described compressed air piping is equipped with vortex-shedding meter 30 and air feed electric control valve 31.
Wet flue gas micronic dust coalescence device after embodiment 2 desulfurization, its structure is: after desulfurization, wet flue gas micronic dust coalescence device 6 micronic dust coalescence device case bottom is connected to the gas vent at wet desulphurization tower 5 top, before this housing tip is connected with the gas feed bottom device for deep cleaning 7 and is positioned at gas distribution grid.The rounded array distribution of micronic dust coalescence device case 10 periphery the GBIM-60110 type Fine-fog nozzle 15 that 10 levels are installed, and this nozzle is two-fluid large discharge, utilizes the swiftly flowing principle of compressed air to make liquid spray particles.Liquids in general, gas pressure all adopt 0.4MPa, flange on Fine-fog nozzle is connected with adapter 11 bolt 14 with flange 12 being arranged on micronic dust coalescence device case periphery, Fine-fog nozzle water receiving joint 16 is connected with high service pipeline by annular water supply line 19, and Fine-fog nozzle pneumatic fitting 17 is connected with compressed air piping by annular air pipe 18.Micronic dust coalescence device case adopts the manufacture of Q235B carbon steel, and the inwall contacted with wet flue gas and external short tube inwall adopt glass inner-lining scale anticorrosion.Glass flake thickness is 2.5 millimeters, safe operating life 5 years.Nozzle material adopts super austenitic stainless steel, and (trade mark: 1.4529), this material is applicable to desulphurization denitration engineering, effectively can resist the corrosion of chlorion.
Between described Fine-fog nozzle water receiving joint and annular water supply line, Fine-fog nozzle water supply valve 21 is housed, Fine-fog nozzle air-supplying valve 20 is housed between Fine-fog nozzle pneumatic fitting and annular air pipe.
Described high service pipeline is equipped with electromagnetic flowmeter 26 and water supply electric control valve 27, described compressed air piping is equipped with vortex-shedding meter 30 and air feed electric control valve 31.
Claims (5)
1. a wet flue gas micronic dust coalescence method after desulfurization, is characterized in that: comprise the steps:
A. flue gas is after desulfurizing tower wet type desulfurizing, enter flue gas micronic dust coalescence device and use Fine-fog nozzle, this nozzle adopts water and compressed air two-fluid spray, the pressure design of water and air in shower nozzle is 0.4MPa, the droplet average grain diameter of ejection is 60 μm, maximum particle diameter is 150 μm, droplet and flue gas flow direction 90 ° of angles are tangent to be mixed, the fine particulates of PM2.5 level and droplet collide coalescence in droplet in this process, droplet can coalescence several ten thousand fine soot particles, droplet is also increasing in coalescence grit process, water droplet particle Ke≤40 μm after coalescence, its average grain diameter 60 μm,
B. the gas after coalescence enters wet type sintering desulfuration flue gas device for deep cleaning, water droplet particle after coalescence is charged in high voltage electric field, and anode is driven under the electric field force effect of corona discharge, electric charge can be discharged rapidly after water droplet is attached to anode surface, a large amount of water droplet successively clings to anode surface, and anode surface maximum adsorption water film thickness is 125 μm, when water film thickness surpasses this thickness, to trickle downwards along positive plate inwall by the gravity of water and fall into slurry pool
C. the flue gas after steps A, B process enters chimney discharge, and dust content can drop at 5mg/Nm
3within.
2. wet flue gas micronic dust coalescence device after the desulfurization that after desulfurization according to claim 1, wet flue gas micronic dust coalescence method uses, it is characterized in that: after desulfurization, wet flue gas micronic dust coalescence Plant arrangement is exported on the flue between wet type sintering desulfuration flue gas device for deep cleaning at desulfurizing tower neat stress, the rounded array distribution of micronic dust coalescence device case periphery the Fine-fog nozzle that 8-16 levels are installed, flange on Fine-fog nozzle is connected with the adapter bolt with flange being arranged on micronic dust coalescence device case periphery, Fine-fog nozzle water receiving joint is connected with high service pipeline by annular water supply line, Fine-fog nozzle pneumatic fitting is connected with compressed air piping by annular steam line.
3. wet flue gas micronic dust coalescence device after desulfurization according to claim 2, it is characterized in that: described micronic dust coalescence device case bottom is connected to the gas vent of wet type desulfurizing top of tower, before this housing tip is connected with the gas feed bottom deep purifying device and is positioned at gas distribution grid.
4. wet flue gas micronic dust coalescence device after desulfurization according to claim 2, it is characterized in that: between described Fine-fog nozzle water receiving joint and annular water supply line, Fine-fog nozzle water supply valve is housed, Fine-fog nozzle air-supplying valve is housed between Fine-fog nozzle pneumatic fitting and annular steam line.
5. wet flue gas micronic dust coalescence device after desulfurization according to claim 2, is characterized in that: described high service pipeline is equipped with electromagnetic flowmeter and water supply electric control valve, described compressed air piping is equipped with vortex-shedding meter and air feed electric control valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410377873.4A CN104258994B (en) | 2014-05-29 | 2014-08-01 | The method and device of wet flue gas micronic dust coalescence after desulfurization |
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| CN201410236170X | 2014-05-29 | ||
| CN201410236170.X | 2014-05-29 | ||
| CN201410236170.XA CN104014427A (en) | 2014-05-29 | 2014-05-29 | Coal-fired flue gas micro dust coagulation method and device |
| CN201410377873.4A CN104258994B (en) | 2014-05-29 | 2014-08-01 | The method and device of wet flue gas micronic dust coalescence after desulfurization |
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| Publication Number | Publication Date |
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| CN104258994A true CN104258994A (en) | 2015-01-07 |
| CN104258994B CN104258994B (en) | 2016-08-24 |
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| CN201410236170.XA Pending CN104014427A (en) | 2014-05-29 | 2014-05-29 | Coal-fired flue gas micro dust coagulation method and device |
| CN201410377873.4A Active CN104258994B (en) | 2014-05-29 | 2014-08-01 | The method and device of wet flue gas micronic dust coalescence after desulfurization |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2016106618A1 (en) * | 2014-12-31 | 2016-07-07 | 耒阳市焱鑫有色金属有限公司 | Blockage cleaning apparatus and method of soot airflow conveying line |
| CN105797524B (en) * | 2016-05-06 | 2017-10-20 | 江苏大学 | A kind of heteropolarity charged droplets coalescence dust arrester and method |
| CN112756110B (en) * | 2020-12-15 | 2021-12-14 | 河北烯电环境科技有限公司 | Industrial aerosol PM2.5 ultra-clean discharge terminal process |
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| Publication number | Publication date |
|---|---|
| CN104258994B (en) | 2016-08-24 |
| CN104014427A (en) | 2014-09-03 |
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Address after: 250300 No.001 Guoshun Road, Jinan Economic Development Zone, Changqing District, Jinan City, Shandong Province Patentee after: SHANDONG GUOSHUN CONSTRUCTION GROUP Co.,Ltd. Address before: 250300 North of Middle Section of Longquan Street, Changqing District, Jinan City, Shandong Province Patentee before: SHANDONG GUOSHUN CONSTRUCTION GROUP Co.,Ltd. |
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Denomination of invention: Method and device for coagulation of micro dust in wet flue gas after desulfurization Effective date of registration: 20221228 Granted publication date: 20160824 Pledgee: Qilu bank Limited by Share Ltd. Ji'nan Changqing branch Pledgor: SHANDONG GUOSHUN CONSTRUCTION GROUP Co.,Ltd. Registration number: Y2022980029384 |
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