CN105107320A - Jet flow ionizer coupling mechanical demister used for wet process flue gas desulfurization - Google Patents
Jet flow ionizer coupling mechanical demister used for wet process flue gas desulfurization Download PDFInfo
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- CN105107320A CN105107320A CN201510527582.3A CN201510527582A CN105107320A CN 105107320 A CN105107320 A CN 105107320A CN 201510527582 A CN201510527582 A CN 201510527582A CN 105107320 A CN105107320 A CN 105107320A
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Abstract
The invention discloses a method for a jet flow ionizer coupling mechanical demister used for wet process flue gas desulfurization. A jet flow ionizer is arranged between a spray layer of a wet process desulfurization tower and a mechanical demister, air is changed to a mixed gas of ion and air (namely ion air) to be sprayed out to enter flue gas between the spray layer of the wet process desulfurization tower and the mechanical demister, the sprayed ion collides with fogdrop in the flue gas so that the fogdrop is charged to become charged fogdrop, the charged fogdrop collides and combines with de-energized fogdrop due to electrostatic force to form fogdrop with large size and large mass, and therefore, the collecting and removal efficiency of the mechanical demister for fine fogdrop can be improved. The demister can be used for purification of fog-containing flue gas of a wet process flue gas desulfurization equipment system, can be used for purification of water mist gas, acid mist gas and other pollution gases, can be used as an ion source, cannot increase land occupation, and is low in operation cost, simple to operate and convenient to manage.
Description
Technical field
The present invention relates to a kind of jet ion generator coupling machinery demister for wet process of FGD, belong to coal-burning boiler smoke evacuation gaseous state Pollutant Control Technology field.
Background technology
Coal is important fossil energy, discharges a large amount of pollutants in combustion, as sulfur dioxide (SO
2), nitrogen oxide (NOx), particle (PM) and heavy metal (such as mercury Hg etc.), severe contamination air, is detrimental to health.2012, China's sulfur dioxide (SO2) emissions total amount was 2117.6 ten thousand tons, and coal directly burns to SO
2genes’ contamination ratio reaches 79%, and wherein the coal consumption amount of electric power and coal-fired heating power accounts for total amount 55%, to SO
2genes’ contamination ratio difference 45%.At present, comprise the wet methods such as limestone/gypsum method, ammonia process, magnesium processes, Dual alkali and be used widely in flue gas desulfurization process of fire coal, its advantage is that technology maturity is high, desulfuration efficiency is higher, stable etc.Wet fuel gas desulfurizing technology utilizes above-mentioned aqueous slkali to be removed SO in flue gas by spray-absorption mode
2after, containing a large amount of alkali lye in flue gas, alkali and SO
2reaction can generate aerosol class material, and these mass emissions cause atmosphere pollution equally.Current industrial main employing installs mechanical demister additional at desulfurizing tower top, such as rotational flow plate defroster, retains flue fog drip by droplet and demister surface collision, realizes wet desulfurization flue gas demist object.The advantage of machinery demister is that structure is simple, cost is low, and shortcoming is low to fine mist removal efficiency.
Summary of the invention
The present invention is directed to the problem that mechanical demister is low to fine mist demisting efficiency, propose a kind of jet ion generator coupling machinery demister for wet process of FGD, namely between the spraying layer and mechanical demister of wet desulfuration tower, jet ion generator is installed.
Described jet ion generator is positioned between desulfurizing tower spraying layer upper end and mechanical demister lower end, is made up of pointed electrode and spray chamber, and spray chamber adopts non-metal insulating material to make, and for circulated gases, air enters from spray chamber entrance, from spray chamber outlet ejection; Pointed electrode adopts metal material to make, be positioned over spray chamber inside and close spray chamber exit position place, being connected with the high-voltage output end of high voltage source by high-tension cable, there is gas discharge and produces ion in pointed electrode and spray chamber exit low-field electrode or form non-uniform electric field with air.Air in spray chamber after discharge process, become the mist (also claiming ionic air) of ion and air, export from spray chamber the flue gas entered between the spraying layer of wet desulfuration tower and mechanical demister.Ion and the flue fog drip of the ejection of jet ion generator collide, make droplet charged, charged droplets is collided by electrostatic force and not Charged Droplet and is combined into size, droplet that quality is larger, increase the droplet free settling under Action of Gravity Field and the inertial collision sedimentation under effect of inertia, reduce the fine mist amount of wet desulfuration tower discharge.
The inner section of spray chamber can be isosceles trapezoid, large near spray chamber porch area of section, and the area of section near spray chamber exit is little, and object makes spray chamber exit gas flow rate the highest; The inner section of spray chamber also can be rectangle, and the flow velocity of gas in spray chamber is constant, by reducing spray chamber outlet diameter, and the air-flow velocity at the place that increases export.
The jet ion generator stated involved by the present invention, can amplify configuration jet ion generator according to exhaust gas volumn and droplet concentration: a kind of mode is the multiple pointed electrode forming array structure of employing, is positioned in the spray chamber of a large volume; Another kind of mode be employing pointed electrode be positioned over little spray chamber inner, form a Small Jet ion generator, and then multiple Small Jet ion generator is formed large-scale jet ion generator according to arranged in arrays, all pointed electrodes are parallel-connected to the high-voltage transmission end of high voltage source.High voltage source is negative dc high voltage power supply, negative pulse high voltage source.
The jet ion generator coupling machinery demister stated involved by the present invention, jet ion generator ejection ion makes fine mist become large scale by small size by electrostatic force, increases Quality of fogdrop, increases gravitational settling and inertial collision action effect.
The jet ion generator stated involved by the present invention is that pointed electrode is positioned in spray chamber, after air changes ionic air in spray chamber, from spray chamber outlet ejection.Jet ion generator coupling machinery demister, during use, the spout direction of jet ion generator is perpendicular to containing mist flow of flue gas direction, or acutangulate at (0-90 degree angle) with containing mist flow of flue gas direction, ensure the inside cavity that can not enter into jet ion generator containing fog dust gas.Adjustment air is from the ejection pressure in spray chamber exit or flow velocity, it is made to be greater than containing the flow velocity of fog dust gas in spray chamber exit and pressure, prevent from entering spray chamber inside containing fog dust gas from spray chamber exit, avoid cavity inside generation dew condensation phenomenon, thus ensure that pointed electrode and spray chamber inwall are isolated, and then ensure the High-Voltage Insulation of pointed electrode.
The jet ion generator stated involved by the present invention, because air enters from spray chamber entrance, the ionized air being rich in ion from the ejection of spray chamber exit, containing fog dust gas can not with pointed electrode contact, do not corrode pointed electrode.Therefore the discharge condition of pointed electrode is not by containing fog dust gas composition influence, ensures that discharge condition is stablized thus.
Of the present invention for wet process of FGD device systems containing mist gas cleaning, advantage is installed on original desulfurizing tower, and do not increase occupation of land, equipment cost is low, and operating cost is low, simple to operate, convenient management.Also may be used for the purification of the dusty gas such as water smoke gas, acid mist gas, and use for ion gun.
Accompanying drawing explanation
Hereinafter the specific embodiment of the present invention is read with reference to accompanying drawing
Fig. 1 is the system schematic of jet ion generator coupling machinery demister method.
Fig. 2 is the jet ion generator structural representation of single pointed electrode structure.
Fig. 3 is the jet ion generator structural representation of multi-stylus shape electrode array configurations.
Fig. 4 is the jet ion generator structural section schematic diagram of multi-stylus shape electrode array configurations
Fig. 5 is that the gas flow of ions of jet ion generator is perpendicular to the schematic diagram containing mist flow of flue gas direction.
Fig. 6 is that the gas flow of ions acute angle of jet ion generator is in the schematic diagram containing mist flow of flue gas direction.
In figure: 1 jet ion generator; 2 desulfurizing towers; 3 spraying layers; 4 mechanical demisters; 5 smoke inlets; 6 exhanst gas outlets; 7 pointed electrodes; 8 spray chambers; 9 spray chamber entrances; 10 spray chamber outlets; The insulated support of 11 pointed electrodes; 12 flow of flue gas directions
Detailed description of the invention
Below with reference to accompanying drawing, one embodiment of the present of invention are described.
Fig. 1 is the system schematic of jet ion generator coupling machinery demister method.Jet ion generator 1 is placed between the spraying layer 3 of desulfurizing tower 2 and mechanical demister 4, mode of laying if the gas flow of ions of Fig. 5 jet ion generator 1 is perpendicular to containing mist flow of flue gas direction 12, or if the gas flow of ions acute angle of the jet ion generator 1 of Fig. 6 is in containing mist flow of flue gas direction 12.Jet ion generator 1 is made up of pointed electrode 7 and spray chamber 8, pointed electrode 7 is metal materials, spray chamber 8 adopts non-metal insulating material to make, pointed electrode 7 is positioned over spray chamber 8 inside and exports 10 places near spray chamber, pointed electrode 7 is connected with the high-voltage output end of high voltage source by high-tension cable, air enters from spray chamber entrance 9, and the ionic air that pointed electrode 7 electric discharge produces, from spray chamber outlet 10 ejection, enters into the flue gas between the spraying layer 3 of desulfurizing tower 2 and mechanical demister 4.The ion that jet ion generator 1 sprays and flue fog drip collide and combine, charged droplet collides coalescence by electrostatic force and not Charged Droplet again, fine mist particle diameter in flue gas and quality become large, the droplet that wherein quality is large is directly deposited in the stock tank of desulfurizing tower 2 under gravity, and those can not the droplet of direct sedimentation with flow of flue gas, under effect of inertia, strike mechanical demister 4 and be removed.By increasing jet ion generator, making the charged coalescence of droplet, increasing the settling efficiency of droplet, reducing the quantity that subparticle arrives with fume emission, original mechanical demister effect basis improves except fog effect.
Claims (6)
1., for a jet ion generator coupling machinery demister for wet process of FGD, it is characterized in that: be positioned between desulfurizing tower spraying layer upper end and mechanical demister lower end, be made up of pointed electrode and spray chamber; Spray chamber adopts non-metal insulating material to make, and for circulated gases, air enters from spray chamber entrance, from spray chamber outlet ejection; Pointed electrode adopts metal material to make, and is positioned over spray chamber inside and near spray chamber exit position place, is connected by high-tension cable with the high-voltage output end of high voltage source.
2. jet ion generator coupling machinery demister according to claim 1, it is characterized in that: the inner section of spray chamber is isosceles trapezoid or rectangle, isosceles trapezoid refers near spray chamber porch area of section large, and the area of section near spray chamber exit is little.
3. jet ion generator coupling machinery demister according to claim 1 and 2, is characterized in that: amplify configuration jet ion generator according to exhaust gas volumn and droplet concentration: a kind of mode is the multiple pointed electrode forming array structure of employing, is positioned in the spray chamber of a large volume; Another kind of mode be employing pointed electrode be positioned over little spray chamber inner, form a Small Jet ion generator, and then multiple Small Jet ion generator is formed large-scale jet ion generator according to arranged in arrays, all pointed electrodes are parallel-connected to the high-voltage transmission end of high voltage source.
4. jet ion generator coupling machinery demister according to claim 1 and 2, is characterized in that: the spout direction of jet ion generator is perpendicular to containing mist flow of flue gas direction, or acutangulates with containing mist flow of flue gas direction; The air ejection pressure in spray chamber exit or flow velocity are greater than containing the pressure of fog dust gas at cavity exit place or flow velocity, avoid entering spray chamber inside containing fog dust gas, ensure the High-Voltage Insulation of pointed electrode.
5. jet ion generator coupling machinery demister according to claim 3, is characterized in that: the spout direction of jet ion generator is perpendicular to containing mist flow of flue gas direction, or acutangulates with containing mist flow of flue gas direction; The air ejection pressure in spray chamber exit or flow velocity are greater than containing the pressure of fog dust gas at cavity exit place or flow velocity, avoid entering spray chamber inside containing fog dust gas, ensure the High-Voltage Insulation of pointed electrode.
6. the jet ion generator coupling machinery demister according to claim 1,2 or 5, is characterized in that: the high voltage source of jet ion generator is negative dc high voltage power supply, negative pulse high voltage source.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510527582.3A CN105107320B (en) | 2015-08-25 | 2015-08-25 | Jet flow ionizer coupling mechanical demister used for wet process flue gas desulfurization |
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| CN201510527582.3A CN105107320B (en) | 2015-08-25 | 2015-08-25 | Jet flow ionizer coupling mechanical demister used for wet process flue gas desulfurization |
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| CN105107320A true CN105107320A (en) | 2015-12-02 |
| CN105107320B CN105107320B (en) | 2017-01-25 |
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Citations (5)
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|---|---|---|---|---|
| US20060005531A1 (en) * | 2002-08-30 | 2006-01-12 | Sabine Calvo | System for exhaust gas treatment comprising a gas ionizing system with ionized air injection |
| CN101703874A (en) * | 2009-11-16 | 2010-05-12 | 浙江大学 | Separate-type nozzle electrode system for governing direct-current corona discharge smoke |
| CN101780435A (en) * | 2010-02-25 | 2010-07-21 | 宁波大学 | Wet static dedusting device |
| CN102794089A (en) * | 2012-08-21 | 2012-11-28 | 浙江富春江环保热电股份有限公司 | Electrode nozzle separated hedging direct current corona discharge assembly for flue gas treatment |
| CN203842494U (en) * | 2014-04-11 | 2014-09-24 | 北京国电龙源环保工程有限公司 | Washing and purifying device of thermal power plant organic amine desulfurization flue gas |
-
2015
- 2015-08-25 CN CN201510527582.3A patent/CN105107320B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060005531A1 (en) * | 2002-08-30 | 2006-01-12 | Sabine Calvo | System for exhaust gas treatment comprising a gas ionizing system with ionized air injection |
| CN101703874A (en) * | 2009-11-16 | 2010-05-12 | 浙江大学 | Separate-type nozzle electrode system for governing direct-current corona discharge smoke |
| CN101780435A (en) * | 2010-02-25 | 2010-07-21 | 宁波大学 | Wet static dedusting device |
| CN102794089A (en) * | 2012-08-21 | 2012-11-28 | 浙江富春江环保热电股份有限公司 | Electrode nozzle separated hedging direct current corona discharge assembly for flue gas treatment |
| CN203842494U (en) * | 2014-04-11 | 2014-09-24 | 北京国电龙源环保工程有限公司 | Washing and purifying device of thermal power plant organic amine desulfurization flue gas |
Non-Patent Citations (1)
| Title |
|---|
| M. ALONSO等: "The measurement of charging efficiencies and losses of aerosol nanoparticles in a corona charger", 《JOURNAL OF ELECTROSTATICS》 * |
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