CN104014427A - Coal-fired flue gas micro dust coagulation method and device - Google Patents
Coal-fired flue gas micro dust coagulation method and device Download PDFInfo
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- CN104014427A CN104014427A CN201410236170.XA CN201410236170A CN104014427A CN 104014427 A CN104014427 A CN 104014427A CN 201410236170 A CN201410236170 A CN 201410236170A CN 104014427 A CN104014427 A CN 104014427A
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Abstract
The invention discloses a coal-fired flue gas micro dust coagulation method and device, belongs to the flue gas purification technology, and especially relates to a flue gas particulate matter separation and removal method and device. The method is as follows: the micro dust coagulation device is arranged on a flue between a desulfurization tower clear flue gas outlet and a deep purification device, a micro fog nozzle is used, double fluid spray comprising water and compressed air is used, PM2.5level particulate matters in flue gas collide fogdrops and coagulate in the fogdrops, in dust particle coagulation, the fogdrops are enlarged, the average particle diameter of coagulated water drops is 60 mu m, the water drops are charged in a high voltage electric field of the deep purification device, and are driven towards a positive pole under the effect of electric field force of corona discharge, the water drops attach the positive pole, then rapidly release charges, a large number of water drops continuously close to the positive pole surface, when the water film thickness is more than 125 mum, the water drops flow down along the inner wall of a positive pole plate into a slurry pool by the gravity of the water, and the processed flue gas dust content can be reduced to less than the 5mg / Nm<3>.
Description
Technical field
The invention belongs to flue gases purification, particularly can the separated method and apparatus of removing fine particle in flue gas.
Background technology
Because fine dust is huge to the harm of health, thereby the performance of deduster has been proposed to very high requirement, enterprise's dust emission standard is required also improving year by year.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 electric field electrostatic precipitator as four electric fields into, some enterprises 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 during flue gas process desulfurizing tower, by desulfurization slurry [calcium carbonate (CaCO
3) or calcium oxide (CaO)] washing, removed the sulfur dioxide (SO in flue gas
2), make the dry flue gas of 150 ℃ of left and right become the wet flue gas of 55 ℃ of left and right.Flue gas, in temperature decline process, has absorbed the moisture in slurries, the 600m of Yi Mou enterprise
2sintering machine is example, and from slurries, the water yield of evaporation per hour is 132 tons.In slurries evaporation process, also take away a part of calcium sulphate dihydrate (CaSO
42H
2o).Generally, the dust content after wet desulphurization (flue dust adds calcium sulphate dihydrate) is at 70mg/m
2left and right, has exceeded the discharge standard of country and Shandong Province.The particle that wants to remove in flue gas after desulfurization just must be developed corresponding new technology with new thinking.
CN102961943A discloses a kind of method and apparatus of wet process of FGD cooperation-removal subparticle, this removal methods is to simply transforming in the clean flue of the desulfurization of wet desulphurization equipment, set up steam phase transforming district and make subparticle condensation growth, make subparticle further condense and grow up with foundation collision condensation region, last flue demister effectively catches the fine particle of condensation growth, then from flue outlet, discharges.The method only can reach; After treatment, chimney breast cigarette temperature is 49 ℃ to flue gas, and flue dust mass concentration is 28mg/Nm
3, the smoke dust discharge concentration that reaches the air pollution emission standard > > of < < thermal power plant (GB13233-2011) regulation is less than 30mg/Nm
3discharge standard,
Applicant in 2012 is patent 201220493828.1 " wet type sintering desulfuration flue gas device for deep cleaning " (hereinafter to be referred as device for deep cleaning) formerly.This device operation principle is to adopt in high-pressure electrostatic ionization flue gas dust charged, after dust is charged, the driving into lower transverse shifting and be attached on positive plate of electric field force, makes particle in flue gas no longer with flow of flue gas.When the dust on positive plate reaches certain thickness, water flushing makes dust and water mix trickling under the effect that is incorporated in gravity and arrives slurry pool.This device put 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
3in, reached the discharge standard at a specified future date of country and Shandong Province.But the high-tension electricity that has 60Kv-80Kv during this device work in system, makes negative electrode and anode in short circuit, electric power system tripping operation during charged flushing.During normal flushing, need have a power failure in advance, power transmission again after flushing.Between flush period device for deep cleaning be idle wet-esp that makes in intermittent operation, be not inconsistent with environmental requirement.
Summary of the invention
In order to overcome in prior art, need to make water to rinse the deficiency that positive plate makes the work of wet-esp interruption, a kind of method that the object of this invention is to provide coal-fired flue-gas micronic dust coalescence, another object of the present invention is to provide equipment the method and coal-fired flue-gas micronic dust coalescence of implementing.
Technical scheme of the present invention is that a kind of method of coal-fired flue-gas micronic dust coalescence, is characterized in that: comprise the steps:
A. flue gas is after desulfurizing tower wet type desulfurizing, enter flue gas micronic dust coalescence equipment and use Fine-fog nozzle, this nozzle adopts water and the spraying of compressed air two-fluid, the pressure design of water and air in shower nozzle is 0.4MPa, the droplet average grain diameter of ejection is 60 μ m, maximum particle diameter is 150 μ m, 90 ° of tangent mixing of angle of droplet and flue gas flow direction, in this process, the fine particulates of PM2.5 level and droplet collision coalescence are in droplet, droplet can several ten thousand trickle soot dust granules of coalescence, droplet is also increasing in coalescence grit process, water droplet particle Ke≤40 μ m after coalescence, its average grain diameter 60 μ m,
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 be 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 μ m, when super this thickness of water film thickness, gravity by water falls into slurry pool along the trickling downwards of positive plate inwall
C. the flue gas after steps A, B process enters chimney discharge, and dust content can drop at 5mg/Nm
3in.
The coal-fired flue-gas micronic dust coalescence equipment that the method for coal-fired flue-gas micronic dust coalescence is used, it is characterized in that: coal-fired flue-gas micronic dust coalescence equipment can be arranged in the clean exhanst gas outlet of desulfurizing tower to the flue between wet type sintering desulfuration flue gas device for deep cleaning, the rounded array distribution of micronic dust coalescence apparatus casing periphery the Fine-fog nozzle that 8-16 levels are installed, flange on Fine-fog nozzle is connected with the adapter bolt with flange that is arranged on micronic dust coalescence apparatus casing 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 apparatus casing bottom is connecting the gas vent of wet type desulfurizing top of tower, before the gas feed of this housing top and deep purifying device bottom is connected and is positioned at gas distribution grid.
Described Fine-fog nozzle water receiving joint and by Fine-fog nozzle water supply valve is housed between annular water supply line, is equipped with Fine-fog nozzle air-supplying valve between Fine-fog nozzle pneumatic fitting and annular steam line.
Electromagnetic flowmeter and water supply electric control valve are housed on described high service pipeline, vortex-shedding meter and air feed electric control valve are housed 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/Nm
3drop to 5mg/Nm
3below, make coal-fired flue-gas reach combustion of natural gas discharge standard.
2. can make device for deep cleaning catch the dust of PM2.5 level
Although PM2.5 occupies the minority in flue dust total release, the health hazard of human body is accounted for to large number.Because it can not be discharged by breathing into lung, be the arch-criminal who causes lung and tracheal disease.Certain 600m of enterprise
2operating condition of sintering machine exhaust gas volumn 3166953m
3/ h, 2664 of the honeycomb ducts of the long 6m of employing inscribed circle 360mm.When flue gas flow rate 2.5m/s, can only catch the above dust granules of particle diameter 10 μ m.Through calculating the migration velocity of electric field, be 90mm/s.The dust granules migration velocity 22.5mm/s of PM2.5 level, 23 meters of anode tube length that need are long.Obvious 6 meters of long tube banks are inoperative.As dust granules 40 μ m, its migration velocity 360mm/s, needs anode tube length to be only 1.5 meters.As design flue gas flow rate 2.95m/s, more than under the electric field of 80Kv, maximum catches dust diameter 12 μ m.If want to catch the dust of PM2.5 level, need that anode tube length is the shortest also wants 27.27 meters, this is structurally difficult to accomplish.
We adopt micronic dust equipment now, and the dust coalescence of a lot of PM2.5 levels, in the globule of 60 μ m, is made migration velocity improve 24 times, and makes 24 times of anode tube contraction in lengths.Add theoretically after coalescence equipment, anode tube length is greater than 1.13 meters.
3. remarkable in economical benefits
(1) save cost
Certain 600m of enterprise
22664 of the former employing electroconductive frp of sintering machine device for deep cleaning honeycomb ducts, 3,896 ten thousand yuan of comprehensive costs.Add that after flue dust strengthening coalescence equipment, flue gas flow rate can be brought up to 6m/s, only needs 1306 of electroconductive frp honeycomb ducts, uses less 1358.If require system flow rate 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) save operating cost
Certain 600m of enterprise
26 of the former adapted constant-current high-voltage DC power supplies of sintering machine device for deep cleaning, general power 1072Kw.After adopting coalescence equipment, the dust higher than resistivity is wrapped in than in the relatively little globule of resistivity, be conducive to the raising of migration velocity, make purifier operation more reliable and more stable.By calculating than line current, constant flow high pressure straight line power supply installed power also reduces 50%, i.e. 536kW.8000 hours running times, 0.78 yuan/kWh of electricity charge unit price calculate per year, save every year 334.46 ten thousand yuan of the electricity charge.
(3) due to micronic dust coalescence equipment increase after efficiency of dust collection very high, to dust content before desulfurization at 150mg/Nm
3the three electric field electrostatic precipitator with interior, reach 5mg/Nm by coalescence equipment to deep purifying again by desulfurization and dedusting
3discharge capacity.With 180m
2sintering machine is example, changes 1,650 ten thousand yuan of four electric field improvement expenseses into just can save by three electric fields.
(4) wet type sintering desulfuration flue gas device for deep cleaning first wife's flush water pump flow 320m
3/ h, lift 40m, power of motor 90kW, cancels after adding coalescence equipment.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.After setting up micronic dust coalescence equipment, save installed power 22.5kW.Because raw water pump is interrupter duty, in water, electric comprehensive energy, consume, increase coalescence equipment and install additional front basic 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 equipment,
Fig. 4 is micronic dust coalescence equipment installation site schematic diagram,
Fig. 5 be A-A of Fig. 4 to cutaway view,
Fig. 6 be B-B of Fig. 5 to cutaway 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. sintering blower fan, 4. desulfurization blower fan, 5. desulfurizing tower, 6 micronic dust coalescence equipment, 7. device for deep cleaning, 8. chimney, 9. shower nozzle, 10. micronic dust coalescence apparatus casing, 11. take over, 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. two layers of dull and stereotyped demisters, 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
The specific embodiment
The specific embodiment of the present invention is, as shown in the figure:
Embodiment 1, coal-fired flue-gas micronic dust coalescence equipment, it is characterized in that: coal-fired flue-gas micronic dust coalescence equipment 6 can be arranged in the clean exhanst gas outlet of desulfurizing tower 5 to the flue between device for deep cleaning 7, the rounded array distribution of micronic dust coalescence apparatus casing 10 periphery the Fine-fog nozzle 15 that 8-16 levels are installed, flange on Fine-fog nozzle is connected with adapter 11 bolts 14 with flange 12 that are arranged on micronic dust coalescence apparatus casing 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 apparatus casing bottom is connecting the gas vent of wet type desulfurizing top of tower, before the gas feed of this housing top and device for deep cleaning bottom is connected 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.
Electromagnetic flowmeter 26 and water supply electric control valve 27 are housed on described high service pipeline, vortex-shedding meter 30 and air feed electric control valve 31 are housed on described compressed air piping.
Embodiment 3 coal-fired flue-gas micronic dust coalescence equipment, its structure is: coal-fired flue-gas micronic dust coalescence equipment 6 micronic dust coalescence apparatus casing bottoms are connecting the gas vent at wet type desulfurizing tower 5 tops, before this housing top is connected with the gas feed of device for deep cleaning 7 bottoms and is positioned at gas distribution grid.The rounded array distribution of micronic dust coalescence apparatus casing 10 periphery the GBIM-60110 type Fine-fog nozzle 15 that 10 levels are installed, and this nozzle is the large flow of two-fluid, 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 bolts 14 with flange 12 that are arranged on micronic dust coalescence apparatus casing 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 apparatus casing adopts the manufacture of Q235B carbon steel, and the inwall contacting 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, can effectively 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.
Electromagnetic flowmeter 26 and water supply electric control valve 27 are housed on described high service pipeline, vortex-shedding meter 30 and air feed electric control valve 31 are housed on described compressed air piping.
Claims (5)
1. a method for coal-fired flue-gas micronic dust coalescence, is characterized in that: comprise the steps:
A. flue gas is after desulfurizing tower wet type desulfurizing, enter flue gas micronic dust coalescence equipment and use Fine-fog nozzle, this nozzle adopts water and the spraying of compressed air two-fluid, the pressure design of water and air in shower nozzle is 0.4MPa, the droplet average grain diameter of ejection is 60 μ m, maximum particle diameter is 150 μ m, 90 ° of tangent mixing of angle of droplet and flue gas flow direction, in this process, the fine particulates of PM2.5 level and droplet collision coalescence are in droplet, droplet can several ten thousand trickle soot dust granules of coalescence, droplet is also increasing in coalescence grit process, water droplet particle Ke≤40 μ m after coalescence, its average grain diameter 60 μ m,
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 be 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 μ m, when super this thickness of water film thickness, gravity by water falls into slurry pool along the trickling downwards of positive plate inwall
C. the flue gas after steps A, B process enters chimney discharge, and dust content can drop at 5mg/Nm
3in.
2. the coal-fired flue-gas micronic dust coalescence equipment that the method for coal-fired flue-gas micronic dust coalescence claimed in claim 1 is used, it is characterized in that: coal-fired flue-gas micronic dust coalescence apparatus arrangement at the clean exhanst gas outlet of desulfurizing tower to the flue between wet type sintering desulfuration flue gas device for deep cleaning, the rounded array distribution of micronic dust coalescence apparatus casing periphery the Fine-fog nozzle that 8-16 levels are installed, flange on Fine-fog nozzle is connected with the adapter bolt with flange that is arranged on micronic dust coalescence apparatus casing 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. coal-fired flue-gas micronic dust coalescence equipment claimed in claim 2, it is characterized in that: described micronic dust coalescence apparatus casing bottom is connecting the gas vent of wet type desulfurizing top of tower, before the gas feed of this housing top and deep purifying device bottom is connected and is positioned at gas distribution grid.
4. coal-fired flue-gas micronic dust coalescence equipment claimed in 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, between Fine-fog nozzle pneumatic fitting and annular steam line, Fine-fog nozzle air-supplying valve is housed.
5. coal-fired flue-gas micronic dust coalescence equipment claimed in claim 2, is characterized in that: electromagnetic flowmeter and water supply electric control valve are housed on described high service pipeline, vortex-shedding meter and air feed electric control valve are housed on described compressed air piping.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410236170.XA CN104014427A (en) | 2014-05-29 | 2014-05-29 | Coal-fired flue gas micro dust coagulation method and device |
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|---|---|
| CN104014427A true CN104014427A (en) | 2014-09-03 |
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ID=51431591
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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 (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105797524A (en) * | 2016-05-06 | 2016-07-27 | 江苏大学 | Heteropolar electric charge fogdrop coalescence dust-removing device and method thereof |
| CN112756110A (en) * | 2020-12-15 | 2021-05-07 | 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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| 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 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003232545A (en) * | 2002-02-06 | 2003-08-22 | Dasukomu Aomori:Kk | Ultrasonic atomizer and method of extracting hinokitiol solution used for the ultrasonic atomizer |
| GB0818372D0 (en) * | 2008-10-08 | 2008-11-12 | Grid Xitek Ltd | Air cleaning apparatus |
| CN103418491A (en) * | 2012-05-16 | 2013-12-04 | 江苏紫光吉地达环境科技股份有限公司 | Method for improving efficiency of electric deduster for removing particulate matter 2.5 (PM2.5) dust in flue gas |
| CN203076084U (en) * | 2013-01-30 | 2013-07-24 | 厦门欣绿洋环保工程有限公司 | Humidifying tower with dry fog humidifying coagulation device |
| CN203425911U (en) * | 2013-08-20 | 2014-02-12 | 石家庄虎林环保设备有限公司 | Device for capturing particulate matters (PM2.5) through water mist charged coagulation for electric precipitation |
-
2014
- 2014-05-29 CN CN201410236170.XA patent/CN104014427A/en active Pending
- 2014-08-01 CN CN201410377873.4A patent/CN104258994B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105797524A (en) * | 2016-05-06 | 2016-07-27 | 江苏大学 | Heteropolar electric charge fogdrop coalescence dust-removing device and method thereof |
| CN105797524B (en) * | 2016-05-06 | 2017-10-20 | 江苏大学 | A kind of heteropolarity charged droplets coalescence dust arrester and method |
| CN112756110A (en) * | 2020-12-15 | 2021-05-07 | 河北烯电环境科技有限公司 | Industrial aerosol PM2.5 ultra-clean discharge terminal process |
| 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 |
| CN104258994A (en) | 2015-01-07 |
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Application publication date: 20140903 |