CN104258994B - The method and device of wet flue gas micronic dust coalescence after desulfurization - Google Patents
The method and device of wet flue gas micronic dust coalescence after desulfurization Download PDFInfo
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Abstract
After the invention discloses a kind of desulfurization, wet flue gas micronic dust coalescence method and device belongs to flue gases purification, particularly can separate and remove the method and device of fine particle in flue gas.The method is installation micronic dust coalescence device on the flue that desulfurizing tower neat stress is exported between device for deep cleaning, use Fine-fog nozzle, use water and compressed air two-fluid spray, the fine particulates of the PM2.5 level in flue gas and droplet collision coalescence are in droplet, droplet is also increasing during coalescence grit, water droplet mean diameter 60 μm after coalescence, these are charged in the high voltage electric field of device for deep cleaning, and it is driven to anode under the electric field force effect of corona discharge, water droplet can discharge rapidly electric charge after being attached to anode surface, a large amount of water droplets successively cling to anode surface, when water film thickness is more than this thickness of 125 μm, trickle downwards along positive plate inwall by the gravity of water and fall into slurry pool, after process, dust content can drop at 5mg/Nm3Within.
Description
Technical field
The invention belongs to flue gases purification, particularly can separate and remove the method and device of fine particle in flue gas.
Background technology
Owing to fine dust is huge to the harm of health, thus the performance of cleaner unit is proposed the highest requirement, 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, for some power plant of qualified discharge, steel mill, original three E field electrostatic precipitator is changed into four electric fields, and some enterprises then change electrostatic precipitator as sack cleaner into.Dry flue gas dedusting can only be significantly improved by these transformations, can reach 30mg/m3.But flue gas is through desulfurizing tower, by desulfurization slurry [calcium carbonate (CaCO3) or calcium oxide (CaO)] washing, the sulfur dioxide (SO being stripped of in flue gas2), make the wet flue gas that the dry flue gas of about 150 DEG C becomes about 55 DEG C.During flue gas drops at temperature, absorb the moisture in serosity, with certain enterprise 600m2As a example by sintering machine, the water yield evaporated per hour from serosity is 132 tons.Serosity evaporation process is also taken away a part of calcium sulphate dihydrate (CaSO4·2H2O).Generally, the dust content (flue dust adds calcium sulphate dihydrate) after wet desulphurization is at 70mg/m3Left and right, beyond country and the discharge standard of Shandong Province.The particulate matter wanting to remove in flue gas after desulfurization is necessary for developing corresponding new technique with new thinking.
CN 102961943 A discloses the method and apparatus of a kind of wet process of FGD cooperation-removal subparticle, this removal methods flue clean to wet desulphurization equipment desulfurization is simply transformed, set up steam phase transforming district and make subparticle condensation growth, make subparticle condense further with foundation collision condensation region to grow up, the fine particle of condensation growth is effectively caught by last flue demister, then discharges from flue outlet.The method is only capable of reaching；After treatment, chimney breast cigarette temperature is 49 DEG C to flue gas, and gas and dust characters is 28mg/Nm3, reach smoke dust discharge concentration that " thermal power plant's air pollution emission standard " (GB13233-2011) specify less than 30mg/Nm3Discharge 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 is to use 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 the particulate matter 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 and trickle under gravity to 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/Nm3Within, reach country and the discharge standard at a specified future date of 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 tripping operation.Normal need to have a power failure in advance when rinsing, power transmission again after flushing.During rinsing, device for deep cleaning is idle to make wet-esp be in intermittent operation, is not inconsistent with environmental requirement.
Summary of the invention
In order to overcome the deficiency needing to use water flushing positive plate to make wet-esp discontinuous in prior art, it is an object of the invention to provide a kind of wet flue gas micronic dust coalescence method after desulfurization, it is a further object to provide the device of wet flue gas micronic dust coalescence after the desulfurization implementing the method.
The technical scheme is that, a kind of wet flue gas micronic dust coalescence method after desulfurization, it is characterised 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 uses water and compressed air two-fluid spray, water and air pressure design in shower nozzle is 0.4MPa, the droplet mean diameter of ejection is 60 μm, maximum particle diameter is 150 μm, 90 ° of angles of droplet and flue gas flow direction are tangent to be mixed, the fine particulates of PM2.5 level and droplet collision coalescence are in droplet in this process, one droplet can several ten thousand fine soot granules of coalescence, droplet is also increasing during coalescence grit, water droplet granule after coalescence can 40 μm, its mean diameter 60 μm,
B. the gas after coalescence enters wet type sintering desulfuration flue gas deep purifying device, water droplet granule after coalescence is charged in high voltage electric field, and it is driven to anode under the electric field force effect of corona discharge, water droplet can discharge rapidly electric charge after being attached to anode surface, a large amount of water droplets successively cling to anode surface, and anode surface maximum adsorption water film thickness is 125 μm, when water film thickness surpasses this thickness, trickle downwards along positive plate inwall by the gravity of water and fall into slurry pool
C. the flue gas after step A, B process enters chimney discharge, and dust content can drop at 5mg/Nm3Within.
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 may be arranged at desulfurizing tower neat stress and is exported on the flue between wet type sintering desulfuration flue gas device for deep cleaning, the micronic dust coalescence rounded array distribution of device case periphery 8 16 Fine-fog nozzles being horizontally mounted, 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 outlet 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 between annular water supply line equipped with Fine-fog nozzle water supply valve, equipped with Fine-fog nozzle air-supplying valve between Fine-fog nozzle pneumatic fitting and annular steam line.
Equipped with electromagnetic flowmeter and water supply electric control valve on described high service pipeline, equipped with vortex-shedding meter and supply electric control valve on described compressed air piping.
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/Nm3Drop to 5mg/Nm3Hereinafter, 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, but the health hazard to human body accounts for big number.Because it can enter lung by breathing and can not discharge, it is to cause pulmonary and the arch-criminal of tracheal disease.Certain enterprise 600 operating condition of sintering machine exhaust gas volumn 3166953m3/ h, uses the honeycomb duct 2664 of the long 6m of inscribed circle 360mm.The particle diameter 10 above dust granules of μm can only be caught as flue gas flow rate 2.5m/s.It is 90mm/s through calculating the migration velocity of electric field.Dust granules migration velocity 22.5mm/s of PM2.5 level, the anode tube length of needs 23 meters is long.Obvious 6 meters of long tube banks are inoperative.Such as dust granules 40 μm, its migration velocity 360mm/s, anode tube length is needed to be only 1.5 meters.As design flue gas flow rate 2.95m/s, under the electric field of 80Kv more than maximum seizure dust diameter 12 μm.If it is desired to the dust catching PM2.5 level needs, anode tube length is the shortest also wants 27.27 meters, and this is structurally difficult to accomplish.
We use micronic dust device now, the dust coalescence of a lot of PM2.5 levels in the globule of 60 μm, make migration velocity improve 24 times, and make anode tube contraction in length 24 times.Theoretically plus after coalescence device, anode tube length is more 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 38,960,000 yuan.After flue dust strengthening coalescence equipment, flue gas flow rate can bring up to 6m/s, it is only necessary to electroconductive frp honeycomb duct 1306, less with 1358.If requiring that system flow rate is constant, frp honeycomb length of tube is shortened to 3 meters by present 6 meters.Comprehensive cost can save 50%, about 19,480,000 yuan.
(2) operating cost is saved
Certain enterprise 600 sintering machine device for deep cleaning first wife is by constant-current high-voltage DC power supply 6, general power 1072Kw.After using coalescence equipment, the dust higher than resistivity is wrapped in the globule more relatively small than resistivity, the beneficially raising of migration velocity, make purifier run more reliable and more stable.Calculating by than line current, constant flow high pressure straight line power supply installed power also reduces 50%, i.e. 536kW.Run 8000 hours time per year, electricity charge unit price 0.78 yuan/kW h calculates, the annual saving electricity charge 334.46 ten thousand yuan.
(3) after increasing due to micronic dust coalescence device, efficiency of dust collection is the highest, to dust content before desulfurization at 150mg/Nm3Within three E field electrostatic precipitator, reach 5mg/Nm by coalescence device to deep purifying again by desulfurization and dedusting3Discharge capacity.As a example by 180 sintering machines, three electric fields change four electric field improvement expenses 16,500,000 yuan into and just can save.
(4) the flush water pump flow 320m of wet type sintering desulfuration flue gas device for deep cleaning first wife3/ h, lift 40m, power of motor 90kW, cancel after adding coalescence device.Newly-increased 1 pump capacity 6.3m3/ h, lift 80m, power of motor 7.5kW.Newly-increased 1 screw-rod air compressor air quantity 780m3/ h, blast 0.5MPa, power 60kW.Installed power 22.5kW is saved after setting up micronic dust coalescence device.Owing to raw water pump is interrupter duty, water, electricity comprehensive energy consume on, increase coalescence equipment with install additional front essentially identical.
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.
nullIn 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. flat board demisters two layers，24. flat board demister one layer，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. supply electric control valves，32. connect annular steam line interface
Detailed description of the invention
The detailed description of the invention 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 may be arranged at desulfurizing tower 5 neat stress and is exported on the flue between device for deep cleaning 7, the micronic dust coalescence device case 10 rounded array distribution of periphery 8 16 Fine-fog nozzles being horizontally mounted 15, 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 outlet 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.
Equipped with Fine-fog nozzle water supply valve 21 between described Fine-fog nozzle water receiving joint and annular water supply line, equipped with Fine-fog nozzle air-supplying valve 20 between Fine-fog nozzle pneumatic fitting and annular air pipe.
Equipped with electromagnetic flowmeter 26 and water supply electric control valve 27 on described high service pipeline, equipped with vortex-shedding meter 30 and supply electric control valve 31 on described compressed air piping.
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 outlet 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 micronic dust coalescence device case 10 rounded array distribution of periphery 10 GBIM-60110 type Fine-fog nozzles 15 being horizontally mounted, and this nozzle is the big flow of two-fluid, utilizes the swiftly flowing principle of compressed air to make liquid spray micronized.Liquids in general, gas pressure all use 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 uses Q235B carbon steel to manufacture, and the inwall contacted with wet flue gas and external short tube inwall use glass inner-lining scale anticorrosion.Glass flake thickness is 2.5 millimeters, safe operating life 5 years.Nozzle material uses super austenitic stainless steel (trade mark: 1.4529), and this material is applicable to desulphurization denitration engineering, is effective against the corrosion of chloride ion.
Equipped with Fine-fog nozzle water supply valve 21 between described Fine-fog nozzle water receiving joint and annular water supply line, equipped with Fine-fog nozzle air-supplying valve 20 between Fine-fog nozzle pneumatic fitting and annular air pipe.
Equipped with electromagnetic flowmeter 26 and water supply electric control valve 27 on described high service pipeline, equipped with vortex-shedding meter 30 and supply electric control valve 31 on described compressed air piping.
Claims (4)
1. wet flue gas micronic dust coalescence device after a desulfurization, it is characterized in that: described wet flue gas micronic dust coalescence device is arranged in desulfurizing tower neat stress and is exported on the flue between wet type sintering desulfuration flue gas device for deep cleaning, the micronic dust coalescence rounded array distribution of device case periphery 8 16 Fine-fog nozzles being horizontally mounted, 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 wet flue gas micronic dust coalescence device completes wet flue gas micronic dust coalescence after desulfurization by following 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 uses water and compressed air two-fluid spray, water and air pressure design in shower nozzle is 0.4MPa, the droplet mean diameter of ejection is 60 μm, maximum particle diameter is 150 μm, and 90 ° of angles of droplet and flue gas flow direction are tangent to be mixed, in this process
The fine particulates of PM2.5 level and droplet collision coalescence in droplet, droplet can several ten thousand fine soot granules of coalescence, droplet is also increasing during coalescence grit, the water droplet granule after coalescence can 40 μm, its mean diameter 60 μm,
B. the gas after coalescence enters wet type sintering desulfuration flue gas device for deep cleaning, water droplet granule after coalescence is charged in high voltage electric field, and it is driven to anode under the electric field force effect of corona discharge, water droplet can discharge rapidly electric charge after being attached to anode surface, a large amount of water droplets successively cling to anode surface, and anode surface maximum adsorption water film thickness is 125 μm, when water film thickness surpasses this thickness, trickle downwards along positive plate inwall by the gravity of water and fall into slurry pool
C. the flue gas after step A, B process enters chimney discharge, and dust content can drop within 5mg/Nm.
2. wet flue gas micronic dust coalescence device after desulfurization as claimed in claim 1, it is characterized in that: described micronic dust coalescence device case bottom is connected to the gas outlet 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.
3. wet flue gas micronic dust coalescence device after desulfurization as claimed in claim 1, it is characterized in that: equipped with Fine-fog nozzle water supply valve between described Fine-fog nozzle water receiving joint and annular water supply line, equipped with Fine-fog nozzle air-supplying valve between Fine-fog nozzle pneumatic fitting and annular steam line.
4. wet flue gas micronic dust coalescence device after desulfurization as claimed in claim 1, is characterized in that: equipped with electromagnetic flowmeter and water supply electric control valve on described high service pipeline, equipped with vortex-shedding meter and supply electric control valve on described compressed air piping.
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| CN201410236170.XA CN104014427A (en) | 2014-05-29 | 2014-05-29 | Coal-fired flue gas micro dust coagulation method and device |
| CN201410236170X | 2014-05-29 | ||
| CN201410236170.X | 2014-05-29 | ||
| 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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| 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 |
| CN109737064B (en) * | 2018-12-29 | 2023-12-15 | 广东汉德精密机械股份有限公司 | Air compressor with electric field oil-gas separation function |
| 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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| CN104258994A (en) | 2015-01-07 |
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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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