CN104906943A - Desulfurization and dust collection cooperative super clean tower - Google Patents
Desulfurization and dust collection cooperative super clean tower Download PDFInfo
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- CN104906943A CN104906943A CN201510362343.7A CN201510362343A CN104906943A CN 104906943 A CN104906943 A CN 104906943A CN 201510362343 A CN201510362343 A CN 201510362343A CN 104906943 A CN104906943 A CN 104906943A
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Abstract
The invention provides a desulfurization and dust collection cooperative super clean tower, which comprises a shell, wherein a flue gas inlet channel is formed in the lower part of the sidewall of the shell, a flue gas outlet is formed in the top of the shell; the other parts of the shell are sealed; a flue gas outlet blind plate, a demister, a spraying layer, a flue gas inlet channel hole plate and a desulfurization slurry pool are arranged in the shell from up to bottom; a PH regulator is arranged in the desulfurization slurry pool; the upper end of the flue gas inlet channel is arranged perpendicular to the shell and in parallel to the water surface; the lower end of the flue gas inlet channel is arranged in a manner of being oblique with the shell; the end from which the flue gas enters, of the lower end of the flue gas inlet channel, is the first end; the other end is the second end; the first end of the lower end of the flue gas inlet channel is higher than the second end; the lower end of the flue gas inlet channel forms an included angle alpha with the water surface. Through the desulfurization and dust collection cooperative super clean tower, the desulfurization efficiency can be improved, the dust concentration of the flue gas can be reduced and the whole structure is small in occupied area and low in production cost.
Description
Technical field
The present invention relates to desulfurization and dedusting field, espespecially a kind of desulfurization and dedusting works in coordination with ultra-clean tower.
Background technology
What require along with domestic Thermal Power Generation Industry environment protection emission improves constantly, and under the standard-required of ultra-clean discharge, though have desulfurizing tower can realize efficient desulfuration efficiency at present, but dust concentration can also be reduced further while high-efficiency desulfurization, alleviate the study hotspot that " gypsum rain " has become air environmental protection industry (epi) personage.Thus the dust removal efficiency how improving desulfurizing tower exhanst gas outlet has become the new trend of development.
At present in order to the flue gas ash removal to desulfurizing tower, common method adopts the various structures such as fountain, venturi-type, impact cleaning type.And be can improve its dust removal efficiency further multiple desulfation dust-extraction device to be cascaded use, though this can improve dust removal efficiency to a certain extent, but plant area area is increased, and cost of manufacture increases, reduce the feasibility much without the project implementation in enough places.
To sum up, exploitation saves land, invest low, that efficiency is high desulfurization and dedusting works in coordination with ultra-clean tower, is current urgent problem.
Summary of the invention
The object of this invention is to provide a kind of desulfurization and dedusting and work in coordination with ultra-clean tower, the requirement of desulfurization and udst separation can be met, meet the requirement of environmental protection.
Technical scheme provided by the invention is as follows:
A kind of desulfurization and dedusting works in coordination with ultra-clean tower, comprises housing;
Described housing sidewall bottom has smoke inlet passage, and top has exhanst gas outlet, and other parts of described housing seal;
Be provided with exhanst gas outlet blind plate, demister, spraying layer, smoke inlet passage orifice plate, desulfurization slurry pond in described housing from top to bottom successively, in described desulfurization slurry pond, be provided with pH-meter, oxidation air pipeline;
Described smoke inlet passage upper end is vertical with described housing to be arranged, and and plane-parallel; Lower end and described housing are obliquely installed, and one end that described smoke inlet passage lower end flue gas enters is its first end, and the other end is its second end, and the first end of described smoke inlet passage lower end is higher than the second end;
The angle of described smoke inlet passage lower end and horizontal plane is α.
The physical characteristic that ultra-clean tower utilizes dust self in flue gas is worked in coordination with in inventive desulfurization dedusting, and dust granules is larger, weight is larger, produces depositional phenomenon more obvious.And the main thoroughfare that smoke inlet passage is dust to be entered, thus the design of smoke inlet passage can reduce entering of the large dust of particle, make full use of the setting of smoke inlet passage top and bottom and housing different angles, greatly reduce oarse-grained dust to enter from smoke inlet passage, improve desulfuration efficiency.
Preferably, described angle α is 15 ° of < α < 20 °.
In the present invention, the angle of smoke inlet passage lower end and horizontal plane is α, and the size of angle [alpha] is arranged between 15 ° and 20 °, realizes the isolation to big dust particle.And then the admission velocity of flue gas can be increased, reduce a large amount of dust and enter in housing.And smoke inlet passage upper end is vertical with housing arranges, and and plane-parallel, contact area when dust sinks can be increased, avoid big dust particle directly to enter in housing from smoke inlet passage.
Preferably, described smoke inlet passage orifice plate comprises the straight plate of mutual vertical interlaced, and described straight plate vertical interlaced forms multiple airflow hole flow through for air-flow, and the percent opening of multiple described airflow hole on described orifice plate is between 30% ~ 60%.
Preferably, described orifice plate adopts propylene polymerization material to make.
Orifice plate of the present invention comprises the straight plate of mutual vertical interlaced, described straight plate vertical interlaced forms multiple airflow hole flow through for air-flow, and the percent opening that airflow hole occupies on orifice plate is arranged between 30% ~ 60%, concrete percent opening can do rational design according to flow field simulation result, object is in order to flue gas can be made on the cross section of housing to be uniformly distributed, and improves desulfurization dust-removing efficiency.And then adopt high polymer polypropylene material to make orifice plate, and high polymer polypropylene material has excellent resistance to water soak, antiacid caustic corrosion, antilysis, and be used on cleaning supplies, health product.With in the present invention, there is the problem preventing secondary pollution, orifice plate various harmful microorganism of uncontrolled generation in moist or that there is uniform temperature environment can be avoided.
Preferably, described spraying layer is multilayer, and every layer of described spraying layer is made up of the double swivel nozzle evenly laid.
The present invention is by arranging the spraying layer of multilayer, and every layer, layer spraying layer is made up of the double swivel nozzle evenly laid.Object is progressively reacted flue gas by Multi-layer sprinkling layer, and in the present invention, adopt double swivel nozzle, double swivel nozzle to be conducive to improving slurries utilization ratio, reducing slurry droplet diameter; Because double swivel nozzle can realize higher coverage rate and better atomizing effect, reduce nozzle flow, improve serum density.By reasonable Arrangement nozzle, improve the utilization rate of slurries, improve nozzle back pressure, reduce slurry droplet diameter; Increase reaction surface area, improve desulfuration efficiency.Meanwhile, utilize dust to have the performance of moisture absorption, when steam is attached on dust, condense into little water droplet, like this, when the steam in spraying layer reaches capacity, the steam of dispersion just depends on dust and forms stable water droplet, can be floating for a long time aloft.Remove water smoke by the demister on upper strata again and carry out deep desulfuration, and then be conducive to the fine solid particle that carries out in flue gas, improve efficiency of dust collection.
Preferably, described demister adopts and becomes the mode at inclination angle to arrange with horizontal plane, and the angle at described inclination angle is between 100 ~ 150 degree.
Demister is arranged and is adopted the mode of angle set between 100 ~ 150 degree to arrange, can increase demister inner vanes and arrange, and then can improve dust removing effects.
Preferably, described exhanst gas outlet blind plate becomes fan-shaped, and the arc limit of fan-shaped described exhanst gas outlet blind plate and described exhanst gas outlet inwall fit tightly.
Preferably, the quantity of described exhanst gas outlet blind plate is several, and exhanst gas outlet blind plate described in several divides and is located at described exhanst gas outlet surrounding.
The present invention arranges several blind plates in exhanst gas outlet surrounding, and blind plate becomes fan-shaped, what the gas after object utilizes blind plate to make desulfurization work in coordination with dedusting was gathered flows out from exhanst gas outlet center, prevents the gas after processing from flowing out from exhanst gas outlet surrounding, is conducive to improving desulfurization and works in coordination with the gas flow after dedusting.By blind plate and exhanst gas outlet inwall is seamless fits tightly setting, the blind area of giving vent to anger is avoided to exist; Reduce sectional area of giving vent to anger, improve desulfurization dust-removing efficiency, and easy for installation.
Preferably, described housing adopts carbon steel anti-corrosion material or 2205 stainless steel materials to make;
And/or;
Described case inside arranges a liner, and described liner adopts 2205 stainless steels to make, and thickness is between 1.0mm ~ 2.0mm.
Work in coordination with ultra-clean tower by desulfurization and dedusting provided by the invention, following at least one beneficial effect can be brought:
1, desulfuration efficiency is high, efficiency of dust collection is high.Smoke inlet channel setting of the present invention becomes little side, side can gather flue gas greatly, reduces oarse-grained dust and enters from smoke inlet passage.Particularly, arrange vertical with housing for smoke inlet passage upper end, and and plane-parallel, and lower end and housing are obliquely installed, and have angle with horizontal plane, utilize dust granules larger, weight is larger, produce the more obvious principle of depositional phenomenon, big dust particle is effectively stoped directly to enter in housing, making its flue gas gather rear concentrating flows in housing, such design can avoid flue gas to gather in heart region in the housing, and the phenomenon existence that the flue gas at inner walls place is less, flue gas is evenly spread from casing center region to surrounding rapidly, improve the uniformity of flue gas on housing cross-sectional.
2, flue gas even distribution is good, dust removal efficiency is high.(1) orifice plate is opened several airflow holes, and the percent opening of several airflow holes on orifice plate is arranged according to flue gas flow field, general control is between 30% ~ 60%.Because flue gas is after the inflow of smoke inlet passage, the power that pours flowed into along with flue gas and inertia force make casing center smoke distribution more, inner walls region smoke distribution is less, above described holes plate structure effectively can improve the situation of this smoke distribution inequality, makes flue gas dispersed on whole housing section.(2) Multi-layer sprinkling layer, every one deck is made up of the double swivel nozzle evenly laid, and adopts double swivel nozzle, and double swivel nozzle is conducive to improving slurries utilization ratio, reducing slurry droplet diameter; This structure can realize higher coverage rate and better atomizing effect effectively, reduces nozzle flow, improves serum density.Improve nozzle back pressure, reduce slurry droplet diameter; Increase reaction surface area, improve desulfuration efficiency, more the uniformity of flue gas in the inner or housing of strong guarantee reaction zone, thus make full use of the dust removing effects that atomizing effect reaches high.(3) demister adopts the mode with certain inclination angle to arrange, by the setting at inclination angle, can increase the layout of the inner vanes of demister, is conducive to improving dust removing effects.
3, ultra-clean desulphurizing and dust-removing integral, reduces floor space.One exhanst gas outlet blind plate is set at smoke outlet, by the arc limit of blind plate and exhanst gas outlet inwall is seamless fits tightly setting, avoids the blind area of giving vent to anger to exist; Reduce sectional area of giving vent to anger, improve desulfurization dust-removing efficiency, and as prior art, do not set up other cleaners, thus decrease the floor space of equipment.
Accompanying drawing explanation
Below by clearly understandable mode, accompanying drawings preferred embodiment, works in coordination with the above-mentioned characteristic of ultra-clean tower, technical characteristic, advantage and implementation thereof to a kind of desulfurization and dedusting and is further described.
Fig. 1 is the structural representation that a kind of desulfurization and dedusting of the present invention works in coordination with a kind of embodiment of ultra-clean tower;
Fig. 2 is the top view of a kind of embodiment of smoke inlet passage orifice plate of the present invention;
Fig. 3 is the top view of exhanst gas outlet exhanst gas outlet blind plate of the present invention;
Fig. 4 is the top view of exhanst gas outlet exhanst gas outlet blind plate using state of the present invention;
Drawing reference numeral illustrates:
1, housing;
2, smoke inlet passage;
201, smoke inlet passage upper end; 202, smoke inlet passage lower end, the angle of α, smoke inlet passage lower end and horizontal plane;
3, smoke inlet passage orifice plate;
301, straight plate; 302, airflow hole;
4, spraying layer;
401, double swivel nozzle;
5, demister;
6, exhanst gas outlet;
601, exhanst gas outlet blind plate;
7, desulfurization slurry pond;
701, pH-meter; 702, oxidation air pipeline.
Detailed description of the invention
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, contrast accompanying drawing is illustrated the specific embodiment of the present invention below.Apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings, and obtain other embodiment.
For making simplified form, only schematically show part related to the present invention in each figure, they do not represent its practical structures as product.In addition, be convenient to make simplified form understand, there are the parts of identical structure or function in some figure, only schematically depict one of them, or only marked one of them.In this article, " one " not only represents " only this ", also can represent the situation of " more than one ".
A kind of desulfurization and dedusting provided by the invention is worked in coordination with ultra-clean tower and is applied in high-efficiency desulfurization cleaning system, in an embodiment of the present invention, with reference to Fig. 1, a kind of desulfurization and dedusting is worked in coordination with ultra-clean tower and is comprised housing 1, this housing 1 integral sealing, carbon steel anti-corrosion material or 2205 stainless steel materials are preferably adopted to make, can liner (not indicating in figure) be set in housing 1, what liner adopted is 2205 stainless steels (is by 22% chromium, the compound stainless steel that 2.5% molybdenum and 4.5% nickel nitrogen alloy are formed, it has high strength, the stress corrosion resistant ability of good impact flexibility and good whole and part), and thickness is arranged between 1.0mm ~ 2.0mm, specifically can adjust according to the actual requirements, only antisepsis need be played, blocked up without the need to what arrange.The shape of housing 1 does not limit, as long as have certain internal capacity, and is cylinder according to the shape that the flow direction of flue gas uses at present.The middle and lower part sidewall of housing 1 is provided with smoke inlet passage 2, and top has exhanst gas outlet 6, in housing 1, be provided with smoke inlet passage orifice plate 3, spraying layer 4, demister 5, exhanst gas outlet blind plate 601 from the bottom up successively according to flow of flue gas direction; This equipment is mainly used in high-efficiency desulfurization, and then the below near smoke inlet passage 2 in housing 1 is provided with desulfurization slurry pond 7, is provided with pH-meter 701, oxidation air pipeline 702 in desulfurization slurry pond 7.Like this except above-mentioned entrance and exit, other parts of housing 1 are sealing, and the object of sealing is to force flue gas to enter from smoke inlet passage 2, is flowing out from exhanst gas outlet 6, and can not walk other paths.
Flue gas enters in housing 1 by smoke inlet passage 2, and owing to containing dust in flue gas, utilize the physical characteristic of dust self, dust granules is larger, weight is larger, produces depositional phenomenon more obvious, is therefore arranged to differ in size by the bore of smoke inlet passage 2.Referring to Fig. 1, particularly, smoke inlet passage upper end 201 is vertical with housing 1 to be arranged, and and plane-parallel; And smoke inlet passage lower end 202 and housing 1 are obliquely installed, one end that smoke inlet passage lower end 202 flue gas enters is its first end, and the other end is its second end, and the first end of smoke inlet passage lower end 202 is higher than the second end; The angle of smoke inlet passage lower end and horizontal plane is α, and concrete 15 ° of < α < 20 °, the angle of inclination can adjust according to actual.According to this, arrange by smoke inlet passage upper end 201 is vertical with housing 1, and and plane-parallel, increase contact area when dust sinks, big dust particle is avoided directly to enter in housing 1 from smoke inlet passage 2, and then in the smoke inlet passage lower end 202 utilizing relative tilt, flue gas is gathered to enter in a large number afterwards, flue gas can be effectively avoided to gather in heart region within the case 1, and the flue gas at housing 1 inwall place is less, thus flue gas is evenly spread from housing 1 central area to surrounding rapidly, improve the uniformity of flue gas on housing 1 cross section.
In embodiments of the invention, smoke inlet passage orifice plate 3 for straight plate 301 anyhow vertical interlaced form, the airflow hole 302 that the flue gas entered consists of staggered straight plate 301 is discharged, the perforated area of multiple airflow hole 302 on smoke inlet passage orifice plate 3 needs to carry out different adjustment according to actual flue gas flow field, on general whole smoke inlet passage orifice plate 3, percent opening is between 30% ~ 60%, reach the object reducing flue gas resistance, the flue gas that housing 1 cross section passes through is uniformly distributed, ensure that the flue gas entered in next processing links can be processed fully, improve treatment effeciency.
Above-mentioned smoke inlet passage orifice plate 3 adopts propylene polymerization material to make.And propylene polymerization material has excellent resistance to water soak, antiacid caustic corrosion, antilysis, be generally used on cleaning supplies, health product.Effectively prevent from producing secondary pollution with smoke contacts when smoke inlet passage orifice plate 3 pairs of flue gas water conservancy diversion, can avoid producing various harmful microorganism uncontrollably in moist or that there is uniform temperature housing 1 environment.
The Multi-layer sprinkling layer 4 arranged above smoke inlet passage orifice plate 3, every layer of spraying layer 4 is made up of the double swivel nozzle 401 of Reasonable Arrangement, concrete should illustrate, the magnitude setting of double swivel nozzle 401 can according to the size of the cross section of housing 1, the requirement of coverage rate, arranges double swivel nozzle 401, object prevents the flue gas without spray from flowing through from reaction zone (spraying layer 4 Fig. 1), improving treatment effeciency, according to this, is also the reason mainly arranging Multi-layer sprinkling layer 4.And spraying layer 4 quantity that each desulfurization and dedusting is worked in coordination with in ultra-clean tower can determine according to the inlet flue gas sulfur content of Practical Project and desulfuration efficiency.And realize the preferred double swivel nozzle 401 of device of spray, can ensure that slurries can have higher coverage rate and better atomizing effect, thus fully mix with flue gas; In addition, through the spray of minimum one-tenth, the dust in flue gas fully contacts with the steam disperseed in housing 1, condenses into little water droplet, and water droplet can be floating for a long time aloft, removes the dust of the fine particle in flue gas, improves desulfuration efficiency.
Flue gas upwards flows in housing 1 always, and simultaneously coagulated little water droplet becomes water smoke upwards to flow always, and after being rinsed by spraying layer 4, the demister 5 through top removes water smoke and larger drop, after carrying out degree of depth dehumidifying and dedusting.Dust content now in flue gas reduces in a large number and has met discharge standard, then flue gas can directly be discharged from exhanst gas outlet 6.
In the present invention, demister 5 adopts and becomes the mode at inclination angle to arrange with horizontal plane, and the angle of inclination angle (not indicating in figure) is arranged between 100 ~ 150 degree.Because demister 5 is mainly made up of fixtures such as waveform blade, plate, card articles, utilizes the arrangement at inclination angle, the layout of blade can be increased, and then absorb the drop carried secretly in gas efficiently, improve efficiency of dust collection.
In embodiments of the invention, in order to ensure the uniform gas flow in housing 1, and reduce the blind area of flue gas outflow, exhanst gas outlet 6 arranges exhanst gas outlet blind plate 601, concrete exhanst gas outlet blind plate 601 is fan-shaped, and housing 1 inwall of the arc limit of fan-shaped exhanst gas outlet blind plate 601 and exhanst gas outlet 6 fits tightly, like this by exhanst gas outlet blind plate 601 flue gas is gathered flow out from the central area of exhanst gas outlet 6, more effectively ensure that the uniformity of flue gas in housing 1, finally guarantee that the flue gas after purifying is discharged by exhanst gas outlet 6.Flow out from exhanst gas outlet 6 surrounding for avoiding flue gas; and then reduce sectional area of giving vent to anger; improve desulfurization dust-removing efficiency; in exhanst gas outlet 6 surrounding, several exhanst gas outlet blind plates 601 are set; concrete exhanst gas outlet blind plate 601 magnitude setting can regulate according to demand; be uniformly distributed or uneven distribution; two ends radius length simultaneously through fan-shaped exhanst gas outlet blind plate 601 arc limit can be equal or unequal, and the flue gas after purifying only need be prevented all to belong within the scope of this technical protection from the leakage of exhanst gas outlet 6 surrounding.
In desulfurization slurry pond 7 in housing 1, be provided with pH-meter 701 and oxidation air pipeline 702 combines, its concrete structure is see patent CN201020188307.6, and this robust construction ensure that the efficient oxidation in housing 1 absorbs.
The course of work of ultra-clean tower is worked in coordination with in inventive desulfurization dedusting:
The design that ultra-clean tower is worked in coordination with in inventive desulfurization dedusting is specifically designed to industrial waste gas and carries out desulfurization process.The gas that need process enters in housing 1 from smoke inlet passage 2, reaction zone (spraying layer 4 in Fig. 1) is entered along the airflow hole 302 that smoke inlet passage orifice plate 3 is arranged, after double swivel nozzle 401 spray atomizing that Multi-layer sprinkling layer 4 is arranged, enter next demister 5 again, so flow continuously through all spraying layers 4 and demister 5, flue gas after purification is when by exhanst gas outlet 6, under exhanst gas outlet blind plate 601 barrier effect arranged, the flue gas after purifying is avoided to flow out from exhanst gas outlet 6 surrounding.
It should be noted that above-described embodiment all can independent assortment as required.The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. desulfurization and dedusting works in coordination with a ultra-clean tower, comprises housing;
It is characterized in that:
Described housing sidewall bottom has smoke inlet passage, and top has exhanst gas outlet, and other parts of described housing seal;
Be provided with exhanst gas outlet blind plate, demister, spraying layer, smoke inlet passage orifice plate, desulfurization slurry pond in described housing from top to bottom successively, in described desulfurization slurry pond, be provided with pH-meter, oxidation air pipeline;
Described smoke inlet passage upper end is vertical with described housing to be arranged, and and plane-parallel; Lower end and described housing are obliquely installed, and one end that described smoke inlet passage lower end flue gas enters is its first end, and the other end is its second end, and the first end of described smoke inlet passage lower end is higher than the second end;
The angle of described smoke inlet passage lower end and horizontal plane is α.
2. desulfurization and dedusting according to claim 1 works in coordination with ultra-clean tower, it is characterized in that:
Described angle α is 15 ° of < α < 20 °.
3. desulfurization and dedusting according to claim 1 works in coordination with ultra-clean tower, it is characterized in that:
Described smoke inlet passage orifice plate comprises the straight plate of mutual vertical interlaced, and described straight plate vertical interlaced forms multiple airflow hole flow through for air-flow, and the percent opening that multiple described airflow hole occupies on described orifice plate is between 30% ~ 60%.
4. desulfurization and dedusting according to claim 3 works in coordination with ultra-clean tower, it is characterized in that:
Described smoke inlet passage orifice plate adopts high polymer polypropylene material to make.
5. desulfurization and dedusting according to claim 1 works in coordination with ultra-clean tower, it is characterized in that:
Described spraying layer is multilayer, and every layer of described spraying layer is made up of the double swivel nozzle evenly laid.
6. desulfurization and dedusting according to claim 1 works in coordination with ultra-clean tower, it is characterized in that:
Described demister adopts and becomes the mode at inclination angle to arrange with horizontal plane, and the angle at described inclination angle is between 100 ~ 150 degree.
7. desulfurization and dedusting according to claim 1 works in coordination with ultra-clean tower, it is characterized in that:
Described exhanst gas outlet blind plate becomes fan-shaped, and the arc limit of fan-shaped described exhanst gas outlet blind plate and described exhanst gas outlet inwall fit tightly.
8. the desulfurization and dedusting according to right pressure 7 works in coordination with ultra-clean tower, it is characterized in that:
The quantity of described exhanst gas outlet blind plate is several, and exhanst gas outlet blind plate described in several divides and is located at described exhanst gas outlet surrounding.
9. desulfurization and dedusting according to claim 1 works in coordination with ultra-clean tower, it is characterized in that:
Described housing adopts carbon steel anti-corrosion material or 2205 stainless steel materials to make;
And/or;
Described case inside arranges a liner, and described liner adopts 2205 stainless steels to make, and thickness is between 1.0mm ~ 2.0mm.
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| CN201510362343.7A CN104906943A (en) | 2015-06-26 | 2015-06-26 | Desulfurization and dust collection cooperative super clean tower |
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| CN201510362343.7A CN104906943A (en) | 2015-06-26 | 2015-06-26 | Desulfurization and dust collection cooperative super clean tower |
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| CN104906943A true CN104906943A (en) | 2015-09-16 |
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| CN106621659A (en) * | 2016-11-30 | 2017-05-10 | 韦永秀 | Wet spraying dust collector suitable for boiler |
| CN108525475A (en) * | 2018-06-25 | 2018-09-14 | 南通春光自控设备工程有限公司 | A kind of desulfurizing tower administered for environmentally friendly air |
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Application publication date: 20150916 |