CN104998504B - A kind of wet desulphurization tower desulfurization and dedusting demisting water saving art - Google Patents

A kind of wet desulphurization tower desulfurization and dedusting demisting water saving art Download PDF

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Publication number
CN104998504B
CN104998504B CN201510436111.1A CN201510436111A CN104998504B CN 104998504 B CN104998504 B CN 104998504B CN 201510436111 A CN201510436111 A CN 201510436111A CN 104998504 B CN104998504 B CN 104998504B
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China
Prior art keywords
flue gas
room
water saving
dedusting demisting
desulfurization
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CN201510436111.1A
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Chinese (zh)
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CN104998504A (en
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张卫东
谢国宝
钱星星
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江苏新中金环保科技股份有限公司
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Abstract

A kind of wet desulphurization tower desulfurization and dedusting demisting water saving art, it is related to waste gas purification field, solve the problems, such as that wet type desulfurizing " gypsum rain " occurs and using wet static dedusting cost problem too high, including impingement room, coalescence room and fine grained filtering unit, it is connected with the lower opening of coalescence room by venturi at the upper shed of the impingement room, fine grained filtering unit is fixed on the top of coalescence room;Center position in the impingement room near lower opening is additionally provided with atomizer, and the opening up atomizer of the atomizer is connected by pipeline with the supply equipment of outside.Low cost of the present invention, installs simple, long service life, without fouling and clogging risk, " gypsum rain " problem is solved, the water in the flue gas of separation can be recycled in desulphurization system by pipeline, the water separated can be used for desulphurization system, and desulphurization system spot patch water is realized substantially.

Description

A kind of wet desulphurization tower desulfurization and dedusting demisting water saving art
Technical field
The present invention relates to waste gas purification field, a kind of wet desulphurization tower dedusting demisting water saving fixtures of specific design, it is adaptable to In wet desulfurization system, the further dedusting demisting of saturated flue gas after desulfurizing tower, and reclaim entrained trip in saturated flue gas From water and part vapor.
Background technology
China is a coal-fired big country, atmospheric environment of sulfur dioxide, nitrogen oxides and the dust that fire coal is produced to China Serious pollution is caused, flue gas desulfurization denitration dust-removing device is that the atmospheric environment for improving China played an important role.
The main technology path based on SCR techniques, supplemented by SNCR of denitrification apparatus of current China;Dust arrester is with electricity Based on deduster, sack cleaner, electric bag are compound, the technology path supplemented by wet electrical dust precipitator and other dedusters;Desulfurization Device it is main in a wet process based on, the technology path supplemented by a semidry method, dry method.
Increasingly strict with Environmental Protection in China emission request, the sulfur dioxide concentration in many local requirements fume emissions is small In 35mg/Nm3, dust concentration is less than 20mg/Nm3, some places even propose 5mg/Nm3Requirement.Many power plant employ The configuration mode of " wet desulphurization tower+wet electrical dust precipitator ", to meet the requirement of minimum discharge.But wet electrical dust precipitator is invested High, floor space is big, operating cost is also very high, and cost performance is very poor, especially for China it is such a in development and And for the country based on fire coal, it more difficult in bearing.In fact, western developed country power plant also seldom uses wet-esp Device, only burning high sulfur coal, sulfur trioxide concentration of emission be high, the colored serious occasion of flue gas is used.
Another problem that wet desulphurization easily brings is " chimney rain " problem, and chimney rain contains dust, stone in acidity The materials such as cream, lime stone and dissolving salt, new environmental problem is carried out to power plant's peripheral band.
Additionally, China is a country for serious water shortage, particularly northwest, North China and Inner Mongolia.And it is northwest, interior The ground rich coal resources such as Mongolia, the old and new power plant is numerous, has been further exacerbated by the water shortage problem of locality.
The content of the invention
In view of the shortcomings of the prior art, an object of the present invention is to provide a kind of low-cost high-efficiency wet type desulfurizing The technique of tower dedusting demisting water saving.
To achieve the above object, the present invention adopts the following technical scheme that realization:
A kind of wet desulphurization tower desulfurization and dedusting demisting water saving art, it is characterized in that, in the desulfurizing tower after desulfurization or flue Dedusting demisting water saving fixtures are inside installed, the flue gas after desulfurization is purified into dedusting demisting water saving fixtures, including following step Suddenly:
1) spray, the flue gas after desulfurization initially enters the impingement room of dedusting demisting water saving fixtures, in impingement room Atomizer continuation spray is carried out to the flue gas after desulfurization, the fine particle in flue gas with from dedusting demisting water saving fixtures There is strong collision in the droplet of ejection, steam starts in fine particle surface aggregation, and fine particle diameter is become big, and formation contains There is short grained flue gas;
2) compress, the flue gas containing medium grain by dedusting demisting water saving fixtures venturi when, medium grain in flue gas Between space further compress, increase subparticle (between dust and dust, between dust and droplet, drop and drop Between) collision probability, subparticle diameter continue increase, formed the flue gas containing medium grain;
3) coalescence, the flue gas containing medium grain travels further into the coalescence room of dedusting demisting water saving fixtures, in coalescence room, Velocity of flue gas reduction, temperature also begins to decline, pressure bottom out, and subparticle diameter further increases in flue gas, and formation contains There is the flue gas of bulky grain;
4) separate, finally the flue gas containing bulky grain enters the fine grained filtering unit of dedusting demisting water saving fixtures, passes through Centrifugal force separates bulky grain with gas, so as to discharge qualified flue gas, the liquid after separation is recycled in desulfurizing tower by pipeline.
The impingement room is spherical in shape, and spherical diameter is 150mm~1200mm.
Impingement room ovalize, Ratio of long radius to short radius is 1.8:1~4.5:1.
The atomizer is ultra-wide angle single fluid or two-fluid spray nozzle, and atomization angle is 130 °~170 °.
The coalescence room is Rafael nozzle type face, and angle of flare is 4 °~10 °.
The venturi is horn-like, and lower mouth is small suitable for reading big, and a length of 50~1500mm, angle of flare is 0 °~8 °.
Shaped by the band one turbofan blade in face of the fine grained filtering unit is constituted, and blade quantity is 3~36, blade and Band drain tank between blade.
It is connected with the lower opening of coalescence room by venturi at the upper shed of the impingement room, fine grained filtering unit It is fixed on the top of coalescence room;Center position in the impingement room near lower opening is additionally provided with atomizer, institute The opening up atomizer for stating atomizer is connected by pipeline with the supply equipment of outside.
Compared with prior art, effect of the invention is:Low cost, installs simple, can be pacified by bolt or welding manner Loaded in the desulfurizing tower after desulfurization or in flue, device entirety movement-less part, long service life, maintenance cost is low (within 8 years It is non-maintaining), with self-cleaning property, cleaned using the gas-liquid collected, without fouling and clogging risk, solve " gypsum rain " and ask Topic, the water in the flue gas of separation can be recycled in desulphurization system by pipeline, and the water separated can be used for desulphurization system, substantially Realize desulphurization system spot patch water.
Brief description of the drawings
Fig. 1 is dedusting demisting water saving fixtures general structure schematic diagram.
Fig. 2 is fine grained separative element structural representation.
In figure, 1 impingement room, 2 atomizers, 3 venturis, 4 coalescence rooms, 5 fine grained filtering units, 51 turbofans Blade, 52 drain tanks.
Specific embodiment
Below in conjunction with the accompanying drawings, technical problem solved by the invention, technical scheme and implementation result are made further in detail Explanation.This explanation is only used for the explanation present invention, is not intended to limit the present invention.
As shown in Figure 1, 2, dedusting demisting water saving fixtures are entered through the flue gas after wet desulphurization tower desulfurization, first by clashing into Cooling chamber, impingement room lower section is provided with atomizer, and atomizer is ultra-wide angle single fluid or two-fluid spray nozzle, atomization angle It is 130 °~170 °, is conducive to the collision between drop and fine particle to remove, atomizer passes through pipeline and supply equipment phase Even.There is strong collision in fine dust and drop in flue gas, steam starts in dust with the droplet sprayed from atomizer Grain surface aggregation is simultaneously grown up.Impingement room is spherical in shape or ellipse, and spherical diameter is 150mm~1200mm, oval duration Minor axis ratio is 1.8:1~4.5:1, can so increase the probability collided between fine particle, while being also beneficial to fine particle Between cohesion grow up.Atomizer continuation sprays droplet, so as to be collided with the flue gas for continuously passing through, makes dust Particle aggregation, fine particle forms little particle.When the flue gas after spraying flows through venturi, the space between fine dust and drop Further compression, increases the collision of subparticle (between dust and dust, between dust and droplet, between drop and drop) Probability, subparticle diameter continues to increase, and forms medium grain, and the venturi is horn-like, and lower mouth is small suitable for reading big, a length of 50~ 1500mm, angle of flare is 0 °~8 °, has both facilitated compression flue gas, is easy to be connected with coalescence room again.Flue gas containing medium grain enters One stepping enters coalescence room, and the coalescence room is Rafael nozzle type face, and angle of flare is 4 °~10 °, velocity of flue gas reduction, temperature Begin to decline, pressure bottom out, subparticle diameter further increases in flue gas, form bulky grain.Last flue gas enters thin Particle filtering unit, shaped by the band one turbofan blade in face of the fine grained filtering unit is constituted, and blade quantity is 3~36, Band drain tank between blade and blade, turbofan blade itself is not moved, by radiation angle, the whirlpool when flue gas stream impacts blade Fan leaf automatically generates motion, and in the effect of centrifugal force, the subparticle (including dust, drop) in flue gas is separated, The water separated can be recycled in desulphurization system, and the flue gas after deep purifying is ultimately discharged into chimney.In deep purifying process In, due to the reduction of temperature, the reduction of flue gas saturation water capacity, the saturated vapor part in flue gas separates out.
By taking certain 600,000 KW generator set desulfurizations as an example, after dedusting demisting water saving fixtures, the dust emission concentration in flue gas By 120mg/Nm3It is down to 30mg/Nm3, concentration of liquid drops is by 50mg/Nm3It is reduced to 8mg/Nm3, the recycle-water about 50t/h from flue gas, Gypsum rain thoroughly is solved the problems, such as, desulphurization system realizes spot patch water substantially.
Again by taking certain 300,000 KW generator set desulfurizations as an example, using dedusting demisting water saving fixtures after, the dust emission in flue gas is dense Degree is by 30mg/Nm3It is down to 8mg/Nm3, concentration of liquid drops is by 30mg/Nm3It is reduced to 7mg/Nm3, the recycle-water about 30t/h from flue gas, Gypsum rain thoroughly is solved the problems, such as, desulphurization system realizes spot patch water.
The present invention is not limited to above-mentioned implementation method, in the case of without departing substantially from substance of the invention, this area skill Any deformation that art personnel are contemplated that, improvement, replacement each fall within the scope of the present invention.

Claims (1)

1. a kind of wet desulphurization tower desulfurization and dedusting demisting water saving art, it is characterized in that, in the desulfurizing tower after desulfurization or in flue Dedusting demisting water saving fixtures are installed, the flue gas after desulfurization is purified into dedusting demisting water saving fixtures, is comprised the following steps:
1) spray, the flue gas after desulfurization initially enters the impingement room of dedusting demisting water saving fixtures, the mist in impingement room Change nozzle carries out continuation spray to the flue gas after desulfurization, and the fine particle in flue gas sprays with from dedusting demisting water saving fixtures Droplet there is strong collision, steam starts in fine particle surface aggregation, and fine particle diameter is become big, is formed containing small The flue gas of particle;
2) compress, the flue gas containing medium grain by dedusting demisting water saving fixtures venturi when, in flue gas between medium grain Space further compress, increase the collision probability of subparticle, subparticle diameter continues to increase, and is formed and contains medium The flue gas of grain;
3) coalescence, the flue gas containing medium grain travels further into the coalescence room of dedusting demisting water saving fixtures, in coalescence room, flue gas Speed reduction, temperature also begins to decline, pressure bottom out, and subparticle diameter further increases in flue gas, is formed containing big The flue gas of particle;
4) separate, finally the flue gas containing bulky grain enters the fine grained filtering unit of dedusting demisting water saving fixtures, by centrifugation Power separates bulky grain with gas, so as to discharge qualified flue gas, the liquid after separation is recycled in desulfurizing tower by pipeline;
The impingement room is spherical in shape, and spherical diameter is 150mm~1200mm, or impingement room ovalize is long Minor axis ratio is 4.5:1~1.8:1, the atomizer be ultra-wide angle single fluid or two-fluid spray nozzle, atomization angle be 130 °~ 170 °, the coalescence room is Rafael nozzle type face, and angle of flare is 4 °~10 °, and the venturi is horn-like, and lower mouth is small suitable for reading Greatly, a length of 50~1500mm, angle of flare is 0 °~8 °, and the fine grained filtering unit is shaped the turbofan blade structure in face by band one Into blade quantity is 3~36, band drain tank between blade and blade.
CN201510436111.1A 2015-07-22 2015-07-22 A kind of wet desulphurization tower desulfurization and dedusting demisting water saving art CN104998504B (en)

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CN105056671B (en) * 2015-07-22 2017-07-28 江苏新中金环保科技股份有限公司 A kind of wet desulphurization tower desulfurization and dedusting demisting water saving art and its device
CN105749690B (en) * 2016-04-28 2017-12-15 河北工业大学 Promote the device and method that fine particle interacts in fire coal boiler fume
CN108434900A (en) * 2017-02-16 2018-08-24 郭连昆 Go out smoke machine
CN110102454B (en) * 2019-04-26 2020-11-17 西安理工大学 Preparation method and recovery device for water mist recovery net cover by using electrostatic field

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JPH0439367B2 (en) * 1987-03-09 1992-06-29
CN2468567Y (en) * 2001-03-27 2002-01-02 杨驭 Spraying and rotating film type apparatus for purifying flue gas
CN100493669C (en) * 2007-02-12 2009-06-03 中冶集团北京冶金设备研究设计总院 Smoke gas purification dust removing device and the technique thereof
CN101455930A (en) * 2008-12-08 2009-06-17 裴登明 Paint mist purification device
CN104388700A (en) * 2014-11-11 2015-03-04 宁夏嘉翔自控技术有限公司 Water spraying dust remover for central dust removal station of magnesium metal smelting and reducing slag high pressure deslagging and charging system
CN204320019U (en) * 2014-12-12 2015-05-13 北京中能诺泰节能环保技术有限责任公司 A kind of dust arrester for wet desulfurization system
CN105056671B (en) * 2015-07-22 2017-07-28 江苏新中金环保科技股份有限公司 A kind of wet desulphurization tower desulfurization and dedusting demisting water saving art and its device

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