CN104998504A - Dust-removing, mist-removing and water-saving technology for desulfurizing of wet desulfurizing tower - Google Patents
Dust-removing, mist-removing and water-saving technology for desulfurizing of wet desulfurizing tower Download PDFInfo
- Publication number
- CN104998504A CN104998504A CN201510436111.1A CN201510436111A CN104998504A CN 104998504 A CN104998504 A CN 104998504A CN 201510436111 A CN201510436111 A CN 201510436111A CN 104998504 A CN104998504 A CN 104998504A
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- Prior art keywords
- flue gas
- water saving
- dust
- room
- dedusting demist
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- 230000003009 desulfurizing effect Effects 0.000 title claims abstract description 15
- 238000013014 water-saving technology Methods 0.000 title abstract 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000000428 dust Substances 0.000 claims abstract description 25
- 239000010419 fine particle Substances 0.000 claims abstract description 12
- 238000001914 filtration Methods 0.000 claims abstract description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 51
- 239000003546 flue gas Substances 0.000 claims description 49
- 238000006477 desulfuration reaction Methods 0.000 claims description 23
- 230000023556 desulfurization Effects 0.000 claims description 23
- 238000004581 coalescence Methods 0.000 claims description 14
- 239000007921 spray Substances 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 238000004220 aggregation Methods 0.000 claims description 3
- 230000002776 aggregation Effects 0.000 claims description 3
- 238000000889 atomisation Methods 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 239000010440 gypsum Substances 0.000 abstract description 6
- 229910052602 gypsum Inorganic materials 0.000 abstract description 6
- 239000002912 waste gas Substances 0.000 abstract description 2
- 230000001112 coagulating effect Effects 0.000 abstract 3
- 238000001816 cooling Methods 0.000 abstract 3
- 230000000903 blocking effect Effects 0.000 abstract 1
- 238000009434 installation Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000000779 smoke Substances 0.000 abstract 1
- 230000001502 supplementing effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000012716 precipitator Substances 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
Abstract
The invention discloses a dust-removing, mist-removing and water-saving technology for desulfurizing of a wet desulfurizing tower and relates to the field of waste gas purifying. The dust-removing, mist-removing and water-saving technology solves the problems that gypsum rain happens in wet type desulfurizing, and the cost is too high in wet type electrostatic dust removing. An impact cooling room, a coagulating room and a fine particle filtering unit are included. An upper opening of the impact cooling room is connected with a lower opening of the coagulating room through a bottleneck, and the fine particle filtering unit is fixed to the top of the coagulating room. An atomizing nozzle is further arranged in the center position, close to the lower opening, in the impact cooling room. An opening of the atomizing nozzle is upward, and the atomizing nozzle is connected with an external water supplying device through a pipeline. The dust-removing, mist-removing and water-saving technology is low in manufacturing cost, simple in installation, long in service life, free of risks of scaling and blocking, and capable of solving the problem of gypsum rain; water in separated smoke can be recovered into a desulfurizing system through a pipeline, separated out water can be used for the desulfurizing system, and zero water supplementing of the desulfurizing system can be achieved basically.
Description
Technical field
The present invention relates to waste gas purification field, a kind of wet desulphurization tower dedusting of specific design demist water saving fixtures, be applicable in wet desulfurization system, the further dedusting demist of saturated flue gas after desulfurizing tower, and reclaim in saturated flue gas entrained free water and part steam.
Background technology
China is a coal-fired big country, and coal-fired sulfur dioxide, nitrogen oxide and the dust produced causes serious pollution to the atmospheric environment of China, and flue gas desulfurization denitration dust-removing device is that the atmospheric environment improving China has played important effect.
The denitrification apparatus of current China mainly based on SCR technique, be auxiliary technology path with SNCR; Dust arrester with electric cleaner, sack cleaner, electric bag be complex as main, be auxiliary technology path with wet electrical dust precipitator and other dedusters; Desulfurizer is mainly master in a wet process, a semidry method, dry method are auxiliary technology path.
Along with the increasingly stringent of Environmental Protection in China emission request, the sulfur dioxide concentration in many local requirements fume emissions is less than 35mg/Nm
3, dust concentration is less than 20mg/Nm
3, some place even proposes 5mg/Nm
3requirement.The configuration mode that many power plant have employed " wet desulphurization tower+wet electrical dust precipitator ", to meet the requirement of minimum discharge.But high, the floor space of wet electrical dust precipitator investment is large, operating cost is also very high, and cost performance is very poor, particularly such one of China is in development and country based on fire coal, is more difficult to bear.In fact, western developed country power plant also seldom adopts wet electrical dust precipitator, only uses in burning high sulfur coal, sulfur trioxide concentration of emission is high, flue gas band look serious occasion.
Another problem that wet desulphurization easily brings is " chimney rain " problem, and chimney rain, in acid, containing materials such as dust, gypsum, lime stone and dissolving salts, brings new environmental problem to power plant's periphery.
In addition, China is the country of a serious water shortage, particularly northwest, North China and Inner Mongolia.And the ground such as northwest, Inner Mongol rich coal resources, the old and new power plant is numerous, exacerbates local water shortage problem further.
Summary of the invention
For the deficiency that prior art exists, an object of the present invention is to provide the technique of a kind of low-cost high-efficiency wet desulphurization tower dedusting demist water saving.
For achieving the above object, the present invention adopts following technical scheme to realize:
A kind of wet desulphurization tower desulfurization and dedusting demist water saving art, it is characterized in that, be provided with dedusting demist water saving fixtures in the desulfurizing tower after desulfurization or in flue, the flue gas after desulfurization enters dedusting demist water saving fixtures and purifies, and comprises the following steps:
1) spray, first flue gas after desulfurization enters the impingement room of dedusting demist water saving fixtures, the atomizer of impingement indoor carries out continuation spray to the flue gas after desulfurization, fine particle in flue gas and the droplet generation strong collision sprayed in dedusting demist water saving fixtures, steam starts at fine particle surface aggregation, and make fine particle diameter become large, formed containing short grained flue gas;
2) compress, flue gas containing medium grain is through the venturi of dedusting demist water saving fixtures, space in flue gas between medium grain is compressed further, increase the collision probability of subparticle (between dust and dust, between dust and droplet, between drop and drop), subparticle diameter continues to increase, and forms the flue gas containing medium grain;
3) coalescence, the flue gas containing medium grain enters the coalescence room of dedusting demist water saving fixtures further, in coalescence room, velocity of flue gas reduces, and temperature also starts to decline, pressure bottom out, in flue gas, subparticle diameter increases further, is formed containing oarse-grained flue gas;
4) be separated, finally enter the fine grained filtering unit of dedusting demist water saving fixtures containing oarse-grained flue gas, by centrifugal force, bulky grain is separated from the gas, thus discharge qualified flue gas, the liquid after separation is recycled in desulfurizing tower by pipeline.
Described impingement room is spherical in shape, and spherical diameter is 150mm ~ 1200mm.
Described impingement room ovalize, Ratio of long radius to short radius is 1.8:1 ~ 4.5:1.
Described atomizer is ultra-wide angle single fluid or two-fluid spray nozzle, and atomization angle is 130 ° ~ 170 °.
Described coalescence room is Rafael nozzle profile, and angle of flare is 4 ° ~ 10 °.
Described venturi is horn-like, lower young greatly suitable for reading, and length is 50 ~ 1500mm, and angle of flare is 0 ° ~ 8 °.
Described fine grained filtering unit is made up of the turbofan blade with certain profile, and blade quantity is 3 ~ 36, is with drain tank between blade and blade.
Upper shed place of described impingement room is connected by the lower opening of venturi with coalescence room, and fine grained filtering unit is fixed on the top of coalescence room; The indoor center position near lower opening of described impingement is also provided with atomizer, and the opening up atomizer of described atomizer is connected with the supply equipment of outside by pipeline.
Compared with prior art, effect of the present invention is: cost is low, install simple, be installed in the desulfurizing tower after desulfurization or in flue by bolt or welding manner, the overall movement-less part of device, long service life, maintenance cost low (non-maintaining within 8 years), there is self-cleaning property, the gas-liquid of collection can be utilized to clean, without fouling and clogging risk, solve " gypsum rain " problem, water in the flue gas be separated is recycled in desulphurization system by pipeline, and the water separated can be used for desulphurization system, substantially realizes desulphurization system spot patch water.
Accompanying drawing explanation
Fig. 1 is dedusting demist 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 unit, 51 turbofan blades, 52 drain tanks.
Detailed description of the invention
Below in conjunction with accompanying drawing, technical problem solved by the invention, technical scheme and implementation result are described in further detail.This illustrates only for explaining the present invention, is not intended to limit the present invention.
As shown in Figure 1, 2, flue gas after wet desulphurization tower desulfurization enters dedusting demist water saving fixtures, first by impingement room, impingement is provided with atomizer below room, atomizer is ultra-wide angle single fluid or two-fluid spray nozzle, atomization angle is 130 ° ~ 170 °, and the collision be conducive between drop and fine particle removes, and atomizer is connected with supply equipment by pipeline.Fine dust in flue gas and drop and the droplet generation strong collision sprayed from atomizer, steam starts at dust granules surface aggregation and grows up.Impingement room is spherical in shape or oval, and spherical diameter is 150mm ~ 1200mm, and time oval, Ratio of long radius to short radius is 1.8:1 ~ 4.5:1, can increase the probability collided between fine particle like this, and the cohesion be also conducive between fine particle is simultaneously grown up.Atomizer continuation ejection droplet, can collide with the flue gas continuously passed through, dust granules is condensed, fine particle forms granule.When the flue gas after spraying flows through venturi, space between fine dust and drop is compressed further, increase the collision probability of subparticle (between dust and dust, between dust and droplet, between drop and drop), subparticle diameter continues to increase, and forms medium grain, described venturi is horn-like, lower young greatly suitable for reading, length is 50 ~ 1500mm, and angle of flare is 0 ° ~ 8 °, both convenient compression flue gas, was convenient to again be connected with coalescence room.Flue gas containing medium grain enters coalescence room further, and described coalescence room is Rafael nozzle profile, and angle of flare is 4 ° ~ 10 °, velocity of flue gas reduces, and temperature also starts to decline, pressure bottom out, in flue gas, subparticle diameter increases further, forms bulky grain.Last flue gas enters fine grained filtering unit, described fine grained filtering unit is made up of the turbofan blade with certain profile, blade quantity is 3 ~ 36, drain tank is with between blade and blade, turbofan blade self does not move, rely on radiation angle, when flue gas stream impacts blade, turbofan blade produces motion automatically, in the effect of centrifugal force, subparticle (comprising dust, drop) in flue gas is separated, the water separated can be recycled in desulphurization system, and the flue gas after deep purifying finally drains into chimney.In deep purifying process, due to the reduction of temperature, the saturated water capacity of flue gas reduces, and the saturated vapor part in flue gas is separated out.
For certain 600,000 KW generator set desulfurizations, after adopting dedusting demist water saving fixtures, the dust emission concentration in flue gas is by 120mg/Nm
3be down to 30mg/Nm
3, concentration of liquid drops is by 50mg/Nm
3be reduced to 8mg/Nm
3, from flue gas, recycle-water is about 50t/h, thoroughly solves gypsum rain problem, and desulphurization system achieves spot patch water substantially.
Again for certain 300,000 KW generator set desulfurizations, after adopting dedusting demist water saving fixtures, the dust emission concentration in flue gas is by 30mg/Nm
3be down to 8mg/Nm
3, concentration of liquid drops is by 30mg/Nm
3be reduced to 7mg/Nm
3, from flue gas, recycle-water is about 30t/h, thoroughly solves gypsum rain problem, and desulphurization system achieves spot patch water.
The present invention is not limited to above-mentioned embodiment, and when not deviating from flesh and blood of the present invention, any distortion that it may occur to persons skilled in the art that, improvement, replacement all fall into scope of the present invention.
Claims (7)
1. a wet desulphurization tower desulfurization and dedusting demist water saving art, is characterized in that, is provided with dedusting demist water saving fixtures in the desulfurizing tower after desulfurization or in flue, and the flue gas after desulfurization enters dedusting demist water saving fixtures and purifies, and comprises the following steps:
1) spray, first flue gas after desulfurization enters the impingement room of dedusting demist water saving fixtures, the atomizer of impingement indoor carries out continuation spray to the flue gas after desulfurization, fine particle in flue gas and the droplet generation strong collision sprayed in dedusting demist water saving fixtures, steam starts at fine particle surface aggregation, and make fine particle diameter become large, formed containing short grained flue gas;
2) compress, flue gas containing medium grain is through the venturi of dedusting demist water saving fixtures, space in flue gas between medium grain is compressed further, increase the collision probability of subparticle (between dust and dust, between dust and droplet, between drop and drop), subparticle diameter continues to increase, and forms the flue gas containing medium grain;
3) coalescence, the flue gas containing medium grain enters the coalescence room of dedusting demist water saving fixtures further, in coalescence room, velocity of flue gas reduces, and temperature also starts to decline, pressure bottom out, in flue gas, subparticle diameter increases further, is formed containing oarse-grained flue gas;
4) be separated, finally enter the fine grained filtering unit of dedusting demist water saving fixtures containing oarse-grained flue gas, by centrifugal force, bulky grain is separated from the gas, thus discharge qualified flue gas, the liquid after separation is recycled in desulfurizing tower by pipeline.
2. a kind of wet desulphurization tower desulfurization and dedusting demist water saving art according to claim 1, it is characterized in that, described impingement room is spherical in shape, and spherical diameter is 150mm ~ 1200mm.
3. a kind of wet desulphurization tower desulfurization and dedusting demist water saving art according to claim 1, it is characterized in that, described impingement room ovalize, Ratio of long radius to short radius is 1.8:1 ~ 4.5:1.
4. a kind of wet desulphurization tower desulfurization and dedusting demist water saving art according to claim 1, it is characterized in that, described atomizer is ultra-wide angle single fluid or two-fluid spray nozzle, and atomization angle is 130 ° ~ 170 °.
5. a kind of wet desulphurization tower desulfurization and dedusting demist water saving art according to claim 1, it is characterized in that, described coalescence room is Rafael nozzle profile, and angle of flare is 4 ° ~ 10 °.
6. a kind of wet desulphurization tower desulfurization and dedusting demist water saving art according to claim 1, it is characterized in that, described venturi is horn-like, lower young greatly suitable for reading, and length is 50 ~ 1500mm, and angle of flare is 0 ° ~ 8 °.
7. a kind of wet type desulfurizing according to claim 1
1tower desulfurization and dedusting demist water saving art, is characterized in that, described fine grained filtering unit is made up of the turbofan blade with certain profile, and blade quantity is 3 ~ 36, is with drain tank between blade and blade.
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| CN201510436111.1A CN104998504B (en) | 2015-07-22 | 2015-07-22 | A kind of wet desulphurization tower desulfurization and dedusting demisting water saving art |
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| CN201510436111.1A CN104998504B (en) | 2015-07-22 | 2015-07-22 | A kind of wet desulphurization tower desulfurization and dedusting demisting water saving art |
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| CN104998504B CN104998504B (en) | 2017-06-30 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105056671A (en) * | 2015-07-22 | 2015-11-18 | 江苏新中金环保科技有限公司 | Desulfurating, dust-removing, demisting and water-saving process for wet-type desulfurization tower and apparatus thereof |
| CN105749690A (en) * | 2016-04-28 | 2016-07-13 | 河北工业大学 | Device and method for promoting interaction of fine particles in smoke of coal-fired boiler |
| CN106799109A (en) * | 2017-03-20 | 2017-06-06 | 林建新 | A kind of high-efficiency energy-saving dust-removing equipment |
| CN108434900A (en) * | 2017-02-16 | 2018-08-24 | 郭连昆 | Go out smoke machine |
| CN110102454A (en) * | 2019-04-26 | 2019-08-09 | 西安理工大学 | Preparation method and recovery device for water mist recovery net cover using electrostatic field |
| CN116832561A (en) * | 2022-03-25 | 2023-10-03 | 中国石油化工股份有限公司 | Device and method for cooperatively removing fog drops and fine particles from flue gas |
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| CN105056671A (en) * | 2015-07-22 | 2015-11-18 | 江苏新中金环保科技有限公司 | Desulfurating, dust-removing, demisting and water-saving process for wet-type desulfurization tower and apparatus thereof |
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| CN116832561A (en) * | 2022-03-25 | 2023-10-03 | 中国石油化工股份有限公司 | Device and method for cooperatively removing fog drops and fine particles from flue gas |
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| Publication number | Publication date |
|---|---|
| CN104998504B (en) | 2017-06-30 |
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Address after: 214000 Zhuhai Road, huankeyuan, Yixing, Wuxi, Jiangsu Patentee after: Jiangsu xinzhongjin Low Carbon Technology Co.,Ltd. Address before: 214200 huankeyuan Zhuhai Road, Yixing City, Wuxi City, Jiangsu Province Patentee before: JIANGSU XINZHONGJIN ENVIRONMENTAL PROTECTION TECHNOLOGY CO.,LTD. |
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