CN102198369A - Swirling inlet type electrostatic spraying wet flue gas desulphurization dedusting apparatus - Google Patents

Swirling inlet type electrostatic spraying wet flue gas desulphurization dedusting apparatus Download PDF

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Publication number
CN102198369A
CN102198369A CN2011101459660A CN201110145966A CN102198369A CN 102198369 A CN102198369 A CN 102198369A CN 2011101459660 A CN2011101459660 A CN 2011101459660A CN 201110145966 A CN201110145966 A CN 201110145966A CN 102198369 A CN102198369 A CN 102198369A
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China
Prior art keywords
electrode
reaction tower
atomizer
flue gas
exhaust gas
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CN2011101459660A
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Chinese (zh)
Inventor
王贞涛
顾利平
罗惕乾
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江苏大学
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Priority to CN2011101459660A priority Critical patent/CN102198369A/en
Publication of CN102198369A publication Critical patent/CN102198369A/en

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Abstract

The invention relates to a swirling inlet type electrostatic spraying wet flue gas desulphurization dedusting apparatus for the purpose of purifying exhaust gas, comprising a spray reaction tower, an electrostatic spraying device, a demister, a flow controller, a control signal sensor, an induced draught fan, an exhaust gas inlet and a waste material inlet. In the invention, the method of electrostatic spraying, in which annular electrodes and acicular electrodes are combined to carry out induction charging and corona charging, further refines droplets of a slurry and enables high pressure polarization of charged and non-charged droplets, thereby generating an additional driving force of mass transfer; air enters through swirling inlets, thereby increasing the contact time between flue gas and droplets; a concentration on-line monitoring device is employed to automatically adjust static voltage and slurry flow and to guarantee that desulphurization efficiency is maintained in a certain scope, thereby meeting discharge standard as well as enhancing economic benefits. The flue gas desulphurization dedusting apparatus provided in the invention has high efficiency, a reduced liquid-gas ratio, low operation cost and a moderate price, and is ideal environmental protection equipment.

Description

A kind of eddy flow air admission type electrostatic spray wet process of FGD dust arrester

Technical field

The present invention relates to a kind of desulfurating dust removing device for flue gas.

Background technology

Wet method calcium agent flue gas desulfurization technique starts from 1909, and has built up the first cover lime flue gas desulphurization system in the world in 1931.Begin the U.S., Japan, Germany etc. and carried out large-scale research work in succession the sixties in 20th century, progressively carries out and perfect flue gas desulfurization technique (FGD), and wherein wet process of FGD technology (WFGD) accounts for more than 85%.China's flue gas desulfurization technique is started late, and mainly to introduce external comparatively ripe FGD technology, progressively absorbs the production domesticization that realizes the FGD technology.The control of seeing coal desulfurization technically can be preceding from burning, three kinds of schemes of burning neutralization burning back desulfurization, and the integrated application of above-mentioned three phases desulfur technology can thoroughly solve SO 2Pollution problem.For the consideration of economy, flue gas desulfurization technique (FGD) will occupy critical role.FGD is divided into dry method, semidry method and wet method, and calcium agent wet process of FGD technology is still occupied leading position.Dry method mainly contains burner hearth dry method injection desulfurization method, high energy electron active oxidation method, charged dry powder injection desulfurization method (CDSI), active carbon absorption process.Most widely used in the semidry method is rotary spraying and drying method (SDA), flue gas circulating fluidized bed flue gas desulfurization technique (CFB-FGD) and flue injection desulfurization technology and humidification ash desulfur technology (NID).Wet desulphurization mainly comprises following several technology, lime stone-gypsum method, phosphorus ammonia composite fertilizer method (PAFP) method, ammonia absorption process, sea water desulfuration method, two alkaline process, magnesium oxide method etc.

The flue gas desulfurization technique of wet method has that desulfurized effect is good, technology is simple relatively, and absorbent utilizes high, and characteristics such as stable and reliable operation, thereby most widely used.But the running liquid-gas ratio in reality is bigger, and water resource is caused great waste, and the intractability of waste water is very big, and forms acid drop desulphurization plant is caused bigger corrosion.For the surprising problem of water consumption of effectively improving wet process of FGD, crucial a bit is with the refinement of desulfurizer slurry droplet, also the total contact area of slurries droplet is constant to guarantee flue gas under the situation that liquid-gas ratio reduces, can effectively improve desulfurized effect, guarantee that droplet is unlikely to generate Powdered in sweetening process, but slurries shape residue, wet process of FGD has dedusting function concurrently simultaneously.

Have similar products like and technology at present both at home and abroad, but remain in many shortcomings.For example, rotation electrostatic charged spray semidry process desulfurizer, be that the charged method of droplet improves the disperse degree of droplet in the space after adopting rotary-atomizing, the alkalies that overcomes the fine particle of high speed rotating spraying machine rotation mist formation drops in and collides the shortcoming that coalescence becomes oarse-grained drop in the flue gas easily.This patent can effectively improve the atomizing effect of slurries, but continual and steady charged unfavorable for slurries.This patent adopts novel electrode, and the mode that adopts needle-like to combine with annular electrode has realized the stability and the persistence of droplet charged process.And utilize dust concentration on-line monitoring and reponse system, and when flue gas concentration changes, by signal controlling with regulate slurry flow, reaching emissions object, and make full use of slurries, reduce the cost of energy-saving and emission-reduction.

In the retrieval prior art, mainly contain application number and be 200720006066 Chinese patent " rotation electrostatic charged spray semidry process desulfurizer ", " test of electrostatic charged spray desulfurization " ([J]. Jiangsu University's journal: natural science edition, 2007,28(5)), " electrostatic charged spray desulfurization and Analysis on Mechanism " ([J]. ACTA Scientiae Circumstantiae, 2001,21(5)) comparatively approaching with the present invention.

Summary of the invention

The purpose of this invention is to provide a kind of eddy flow air admission type electrostatic spray wet flue gas desulfurizer, be meant a kind of electrostatic spray wet process of FGD dust pelletizing system and using method thereof that the discharging of sulfur dioxide in the waste gas and dust is control effectively especially.The shortcoming that it can overcome high liquid-gas ratio in the wet method fume desulfurizing system, water consumption is huge and the density unevenness of alkaline droplet in transport process is even, produce additional mass transfer force under the effect of the Coulomb force that can produce in the high-voltage electrostatic field, polarization force again, strengthen droplet and absorb SO 2With the dust absorbability.

Design a kind of electrostatic spray flue gas desulfurization dust-removal system according to above-mentioned purpose, comprised spraying reaction tower, electrostatic atomizer, demister, flow controller, control signal sensor, air-introduced machine, exhaust gas entrance and garbage collection mouth.Exhaust gas entrance is positioned at the bottom of spraying reaction tower, and exhaust gas entrance is shaped as rectangle, evenly arranges 3-5 piece eddy flow baffle plate in the rectangle in the horizontal direction, and the deflector angle is regulated at the 0-90 degree.Electrostatic atomizer comprises atomizer, HV generator, electrode, interconnective pipeline and electrode power-line; Atomizer adopts the low pressure vortex atomizing nozzle, and atomizer is furnished with the electrode pair spraying area that annular electrode combines with needle electrode outward and carries out assisted atomization.The annular electrode size diameter is 100-300mm, annular electrode plane and nozzle bottom plan range 0-100mm range regulation; Atomizer and electrode are arranged at the top in the spraying reaction tower tower body, and HV generator is positioned at outside the spraying reaction tower, and HV generator passes the spray reaction tower body by pipeline and electrode power-line and links to each other with annular electrode with nozzle respectively.Demister is positioned at the top of spraying reaction tower tower body, and demister is double-deck demister, and ground floor is more sparse than second layer grid.Air-introduced machine is connected by the outlet of pipeline with the spray reaction column overhead.The garbage collection mouth is arranged at the bottom of spraying reaction tower.Flow controller is positioned at spraying reaction tower tower body outside, and flow controller is connected with atomizer by pipeline, and flow controller is provided with the slurries inlet.The control signal sensor is connection traffic controller and HV generator respectively, and the control signal sensor connects apparatus for measuring concentration.Apparatus for measuring concentration measurement of concetration probe is separately positioned on exhaust gas entrance and waste gas outlet.The control signal sensor is regulated the flow of slurries according to the Signal Regulation flow controller that apparatus for measuring concentration provides; Apparatus for measuring concentration detects immediately to sulfur dioxide concentration, the dust concentration of inlet outlet, calculates desulfurization degree η 1 With efficiency of dust collection η 2 , work as desulfurization degree η 1 With efficiency of dust collection η 2 Efficient has a signal (slurry flow or voltage are effectively regulated) to pass to HV generator or automatic flow rate adjusting device is regulated by the control signal sensor not when the rated value scope this moment, makes it to satisfy SO 2Specified removal efficiency scope with dust.

The present invention is under the effect of high-voltage electrostatic field, and the mist droplet particle size in the slurries spray reactor further reduces, and the disperse degree in the space increases under the effect of coulomb repulsion, has effectively increased the contact area and the action time of droplet and waste gas; Among the present invention, waste gas enters reaction tower by swirl-flow devices, forms spiralling air-flow, has increased the effective acting time of droplet and waste gas; Droplet Coulomb force, polarization force effect under electrostatic field produce the additional effect power to small molecule or flying dust, have improved the desulfurization and dedusting effect of droplet; Droplet is under the high voltage electric field effect, and the distribution of its ion takes place significantly to improve, and will help the ionization of calcium base ion in the droplet, thereby improves desulfuration efficiency.The present invention has improved the traditional endless electrode on the basis of forefathers' research, utilize the annular electrode form that combines with needle-like, has guaranteed the stability and the continuation of droplet charged process, has avoided simple annular electrode in the charged unstability of spraying area.

Concentration on-line monitoring of the present invention and flow regulator have reached the exhaust gas discharging standard when reaching slurries and making full use of.Under the prerequisite of energy-saving and emission-reduction, obtained the desulfuration efficiency close, but liquid-gas ratio is 1/3 of a conventional spray-on process, has saved water resource effectively, has protected natural environment with conventional wet process of FGD.

Description of drawings

Fig. 1 is an embodiment of the invention organigram.

Fig. 2 is an exhaust gas inlet swirl-flow devices schematic diagram.

Fig. 3 is charged electrode (annular and needle-like combination).

Fig. 1,1 spraying reaction tower; 2 electrodes; 3 atomizers; 4 demisters; 5 flow control valves; 6 slurries inlet; High 7 press electrostatic generator; 8 control signal sensors; 9 air-introduced machines; 10 apparatus for measuring concentration; 11 exhaust gas entrances; 12 garbage collection mouths; 13 eddy flow baffle plates.

The specific embodiment

Patent of the present invention in use, the coal-fired waste gas (flue gas and dust) that produces is by exhaust gas entrance 11, through eddy flow baffle plate 13, eddy flow baffle plate can carry out angular adjustment as required, rotation flows into spraying reaction tower 1, with the flow control valve 5 of flowing through through slurries inlet 6, by nozzle 3 ejections, the droplet after the charged electrode 2 of annular and needle-like combination is charged removes SO 2Effect with dust.Droplet can produce secondary-atomizing under the effect of charged electrode after spraying through drive nozzle, form more tiny droplet, removes SO with droplet generation chemical reaction under the effect of high-voltage electrostatic field 2, and remove dust in the waste gas.Adopt annular and needle electrode to carry out when charged, droplet humidity hour annular electrode that droplet charged act as induction is charged, after droplet concentration raises, responding to charged effect descends or loses, needle electrode produces the corona charging effect, thereby has overcome the deficiency that has single charged mode merely.Air-introduced machine 9 provides the power of smoke movement, and apparatus for measuring concentration 10 is by measuring SO in the import and export 2With the content of dust, obtain desulfuration efficiency and dust removal efficiency.Control signal sensor 8 is controlled HV generator 7 and flow controller 5 by the variation of perception desulfuration efficiency and dust removal efficiency.Example: by the SO of exhaust gas entrance 11 2Concentration when raising, concentration detection apparatus detects 10 to importing and exporting the concentration difference increase, desulfuration efficiency reduces, when desulfuration efficiency during less than a certain rated efficiency, 8 beginnings of control signal sensor are transmitted signal to HV generator 7 and flow controller 5, augmented flow improves SO to improve calcium sulfur ratio and electrostatic potential 2Absorption efficiency.When desulfuration efficiency and dust removal efficiency satisfied rated efficiency, control signal sensor 8 quit work.SO by exhaust gas entrance 11 2Concentration when reducing, concentration detection apparatus detection 9 reduces to importing and exporting concentration difference, desulfuration efficiency raises, when being higher than a certain rated efficiency, in order to guarantee the economy of desulphurization system, 8 beginnings of control signal sensor are transmitted signal to HV generator 7 and flow controller 5, reduce flow to improve calcium sulfur ratio and electrostatic potential, come appropriate SO 2Absorption efficiency, it is worked under declared working condition.

Demister is provided with bilayer, under the situation that does not enlarge markedly resistance, makes the least possible power set that enter of droplet, the corrosion of assurance device acid and alkali mist, the stability and the reliability of assurance device operation.The slag inclusion waste liquid that desulfurization produces can be collected by garbage collection mouth 12, removes residue through post precipitation, and waste liquid can be recycled, and improves the utilization rate of calcium.

Claims (4)

1. eddy flow air admission type electrostatic spray wet process of FGD dust arrester, it is characterized in that, comprise spraying reaction tower (1), electrostatic atomizer, demister (4), flow controller (5), control signal sensor (8), air-introduced machine (9), exhaust gas entrance (11) and garbage collection mouth (12); Described exhaust gas entrance (11) is positioned at the bottom of spraying reaction tower (1); Described electrostatic atomizer comprises atomizer (3), HV generator (7), electrode (2), interconnective pipeline and electrode power-line; Described atomizer adopts low pressure vortex atomizing nozzle (3), is furnished with electrode (2) outside the described atomizer (3) spraying area is carried out assisted atomization; Described annular electrode size diameter is 100-300mm, and described annular electrode plane and atomizer (3) base plane is apart from the 0-100mm range regulation; Described atomizer (3) and electrode (2) are arranged at the top in spraying reaction tower (1) tower body, described HV generator (7) is positioned at outside the spraying reaction tower (1), and HV generator (7) passes spraying reaction tower (1) body by pipeline and electrode power-line and links to each other with annular electrode with nozzle respectively; Described demister (4) is positioned at the top of spraying reaction tower (1) tower body, and described demister (4) is double-deck demister, and ground floor is more sparse than second layer grid; Described air-introduced machine (9) is connected by the outlet of pipeline with spraying reaction tower (1) cat head; Described garbage collection mouth (12) is arranged at the bottom of spraying reaction tower (1); Described flow controller (5) is positioned at spraying reaction tower (1) tower body outside, and described flow controller (5) is connected with atomizer (3) by pipeline, and described flow controller (5) is provided with slurries inlets (6); Described control signal sensor (8) is connection traffic controller (5) and HV generator (7) respectively.
2. a kind of eddy flow air admission type electrostatic spray wet process of FGD dust arrester according to claim 1, it is characterized in that, described exhaust gas entrance (11) is shaped as rectangle, evenly arrange 3-5 piece eddy flow baffle plate (13) in the rectangle in the horizontal direction, described eddy flow baffle plate (13) angle is regulated at the 0-90 degree.
3. eddy flow air admission type electrostatic spray wet process of FGD dust arrester according to claim 1 and 2, it is characterized in that, also comprise apparatus for measuring concentration (10), described control signal sensor (8) connects apparatus for measuring concentration (10), and described apparatus for measuring concentration (10) measurement of concetration probe is separately positioned on exhaust gas entrance (11) and waste gas outlet; Described control signal sensor (8) is regulated the flow of slurries according to the Signal Regulation flow controller (5) that apparatus for measuring concentration (10) provides.
4. eddy flow air admission type electrostatic spray wet process of FGD dust arrester according to claim 1, it is characterized in that, described electrode (2) combines with needle electrode for annular electrode, described annular electrode size diameter is 100-300mm, described annular electrode plane and nozzle bottom plan range 0-100mm range regulation.
CN2011101459660A 2011-06-01 2011-06-01 Swirling inlet type electrostatic spraying wet flue gas desulphurization dedusting apparatus CN102198369A (en)

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Cited By (11)

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Publication number Priority date Publication date Assignee Title
CN103203284A (en) * 2013-04-07 2013-07-17 熊天渝 Wet type electrostatic precipitator
CN103480263A (en) * 2013-10-17 2014-01-01 江苏欧超环保科技有限公司 Pre-charge spraying desulfurization and dust removal device
CN104096434A (en) * 2013-04-03 2014-10-15 厦门大学 Novel technology and novel device for dedusting and desulphurization of flue gas
CN104162486A (en) * 2013-05-20 2014-11-26 上海三卿环保科技有限公司 Method for synchronously removing sulfur dioxide and fine particles in smoke through electrical charge and mist spray
CN104174279A (en) * 2014-08-12 2014-12-03 江苏大学 Bipolar corona discharge flue gas desulfurization and dust removal method and equipment
CN104801422A (en) * 2015-04-14 2015-07-29 重庆大学 Efficient dust removal system for coal-fired flue gas
CN105855054A (en) * 2016-06-13 2016-08-17 江苏乐居乐家网络科技有限公司 Metal ionization structure for air purifier
CN108325743A (en) * 2017-12-23 2018-07-27 共同科技开发有限公司 A kind of building external construction electrostatic precipitator
CN109365129A (en) * 2018-10-25 2019-02-22 辽宁工程技术大学 A kind of charged dust-extraction unit of Sprial-flow suction type cloud
CN109604063A (en) * 2018-11-28 2019-04-12 北京工业大学 A kind of device and method of the adjustable atomization wet static dedusting for Collaborative Control multiple pollutant
KR20190046068A (en) * 2017-10-25 2019-05-07 주식회사 센트리 Pollutant treating apparatus using electrospray

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104096434A (en) * 2013-04-03 2014-10-15 厦门大学 Novel technology and novel device for dedusting and desulphurization of flue gas
CN103203284B (en) * 2013-04-07 2015-09-30 熊天渝 Wet cottrell
CN103203284A (en) * 2013-04-07 2013-07-17 熊天渝 Wet type electrostatic precipitator
CN104162486A (en) * 2013-05-20 2014-11-26 上海三卿环保科技有限公司 Method for synchronously removing sulfur dioxide and fine particles in smoke through electrical charge and mist spray
CN103480263A (en) * 2013-10-17 2014-01-01 江苏欧超环保科技有限公司 Pre-charge spraying desulfurization and dust removal device
CN104174279A (en) * 2014-08-12 2014-12-03 江苏大学 Bipolar corona discharge flue gas desulfurization and dust removal method and equipment
CN104174279B (en) * 2014-08-12 2016-01-20 江苏大学 A kind of bipolar corona discharge FGD dust collection method and equipment thereof
CN104801422A (en) * 2015-04-14 2015-07-29 重庆大学 Efficient dust removal system for coal-fired flue gas
CN104801422B (en) * 2015-04-14 2017-01-25 重庆大学 Efficient dust removal system for coal-fired flue gas
CN105855054A (en) * 2016-06-13 2016-08-17 江苏乐居乐家网络科技有限公司 Metal ionization structure for air purifier
KR20190046068A (en) * 2017-10-25 2019-05-07 주식회사 센트리 Pollutant treating apparatus using electrospray
KR102024774B1 (en) 2017-10-25 2019-09-25 주식회사 센트리 Pollutant treating apparatus using electrospray
CN108325743A (en) * 2017-12-23 2018-07-27 共同科技开发有限公司 A kind of building external construction electrostatic precipitator
CN109365129A (en) * 2018-10-25 2019-02-22 辽宁工程技术大学 A kind of charged dust-extraction unit of Sprial-flow suction type cloud
CN109604063A (en) * 2018-11-28 2019-04-12 北京工业大学 A kind of device and method of the adjustable atomization wet static dedusting for Collaborative Control multiple pollutant

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Application publication date: 20110928