CN106823646A - A kind of multistage bundled tube dedusting demister - Google Patents

A kind of multistage bundled tube dedusting demister Download PDF

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Publication number
CN106823646A
CN106823646A CN201710021193.2A CN201710021193A CN106823646A CN 106823646 A CN106823646 A CN 106823646A CN 201710021193 A CN201710021193 A CN 201710021193A CN 106823646 A CN106823646 A CN 106823646A
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CN
China
Prior art keywords
bundled tube
tube dedusting
dedusting demister
multistage
coalescence
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710021193.2A
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Chinese (zh)
Inventor
徐海涛
周长城
沈凯
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NANJING YUHANG ENVIRONMENTAL TECHNOLOGY Co Ltd
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NANJING YUHANG ENVIRONMENTAL TECHNOLOGY Co Ltd
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Publication date
Application filed by NANJING YUHANG ENVIRONMENTAL TECHNOLOGY Co Ltd filed Critical NANJING YUHANG ENVIRONMENTAL TECHNOLOGY Co Ltd
Priority to CN201710021193.2A priority Critical patent/CN106823646A/en
Publication of CN106823646A publication Critical patent/CN106823646A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D50/00Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/40Combinations of devices covered by groups B01D45/00 and B01D47/00

Abstract

The invention discloses a kind of multistage bundled tube dedusting demister, belong to exhaust-gas treatment field.The device is located at the top of spraying layer in absorption tower, and described device includes n grades of bundled tube dedusting demister from down to up, and coalescence device is provided between at least one set of connected bundled tube dedusting demister;Described coalescence device includes atomization conduit, and described atomization conduit is provided with several atomizers.The present invention increases coalescence device by different eddy flow component interlayers, improve fine particle dusts and the probability of inertial collision, interception and coalescence occurs between spraying into coalescence drop, improve dust can catching, removal efficiency is improved under equal eddy flow component series, eddy flow component series reduction needed for reaching equal efficiency in other words, reduces investment and operating cost.

Description

A kind of multistage bundled tube dedusting demister
Technical field
The invention belongs to exhaust-gas treatment field, and in particular to a kind of multistage bundled tube dedusting demister.
Background technology
At present, the existing coal unit of China generally uses lime stone --- gypsum wet flue gas desulfurizing technique, from absorption In the wet flue gas of tower discharge in addition to the dust not eliminated containing part front end deduster, also containing substantial amounts of in fine mist shape State lime stone, gypsum slurries etc., with the raising increasingly of state environmental emissioning standard, need to carry out depth to the neat stress after desulfurization Dedusting.According to newest promulgation《Fossil-fuel power plant atmospheric pollutant emission standard》, the dust concentration to smoke stack emission proposes 5mg/ m3Requirement.
The dedusting demisting of flue gas is most commonly seen technique in fume purifying processes, and type is varied, but for containing For the treatment of the saturation wet flue gas of a large amount of droplets, the intractability with reality.In order to solve fine dust, particulate Separated Deng the small miscellaneous dirt of particle diameter, part of generating units is processed using deflection plate demister+WESP (wet type electrostatic precipitator), but for Retrofit work amount is huge for built desulfurization unit, generally existing absorption tower body need to be increased, strengthening of foundation, transforms the cycle It is long, and it contains substantial amounts of high voltage electric equipment, operation and operation difficulty are larger.
Bundled tube dedusting demister as WESP a kind of substitute technology, because its simple structure, reliable, energy consumption are low And be used widely.Bundled tube dedusting demister is a kind of gas-liquid separator based on centrifugal force separate, using rotary pneumatic The centrifugal action of stream, the drop that will be carried secretly in air-flow is got rid of to wall peripheral, fine drop, fine solid particle particle in flue gas, gas The reunion that collides with each other of the finely ground particles such as colloidal sol is condensed into big drop, big drop again by the liquid film capture of cyclone cylinder surface so that real Now separated with gas phase and removed, with pressure drop it is small, except fog effect preferably, simple structure, transformation implement it is simple the advantages of, especially fit For the waste gas demisting with solid or with salinity in acid mist after wet desulphurization.
Such demister is the separation that drop or particle are realized by centrifugal force, when load is relatively low or grain diameter When too small, because when centrifugal force is smaller or centrifugal force is not enough to make separate small, separative efficiency is poor, although can improve removing The series of day with fog reaches certain removal efficiency, but investment and operating cost are substantially increased, even if or even increasing under partial picture Demister series is also difficult to meet emission request.
The content of the invention
The present invention provides a kind of multistage bundled tube dedusting demister for the defect that existing above-mentioned technology is present.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of multistage bundled tube dedusting demister, the device is located at the top of spraying layer in absorption tower, described device Include n grades of bundled tube dedusting demister from down to up, coalescence is provided between the bundled tube dedusting demister that at least two-stage is connected Device;Described bundled tube dedusting demister includes m bundled tube dedusting demisting unit, described bundled tube dedusting demisting unit The z eddy flow component including cylindrical outer barrel and in cylindrical outer barrel, described eddy flow component includes several eddy flows Blade and a central tube, swirl vane are evenly distributed between center drum outer wall and cylindrical outer barrel inwall at an oblique angle Annular section in;Described coalescence device includes atomization conduit, and described atomization conduit is provided with several atomizers;
The coalescence liquid that coalescence device is used is the process water of process water, steam or addition chemical agglomeration agent;
Wherein:N >=2, m >=2, z >=1;
Described addition chemical agglomeration agent is the mixture of high polymer flocculant, wetting agent and inorganic additives, described High polymer flocculant be polyacrylamide, polyethylene glycol oxide, polyvinyl alcohol, in polyvinylpyrrolidone and polyvinylether one Plant or various;Described wetting agent is sulfonated oil, one or more in thio-alcohol, hydrazides class and mercaptan acetals;Described Inorganic additives are sodium phosphate;
In some preferred technical schemes:Add chemical agglomeration agent process water be in process water add 0.5%~ 2.5% chemical agglomeration agent, described chemical agglomeration agent be 0.004%~0.25% high polymer flocculant, 0.0002~ 0.02% wetting agent and 0.001~0.05% inorganic additives, remaining is water.
In technical solution of the present invention:The atomizing particle size of the atomizer is 20~80 μm.
In technical solution of the present invention:Described connected eddy flow component is provided with liquid film and intercepts and collector, and described liquid film is blocked Cut and collector includes intercepting ring and collects hole, described interception ring is located at cylindrical outer barrel internal perisporium, described collection hole position Between cylindrical outer barrel and interception ring;Described collection hole is semicircle, circular or waist-hole type, and preferably described collection hole is It is semicircle.
In technical solution of the present invention:Bundled tube dedusting demisting unit top is provided with baffle ring, and the internal diameter of the baffle ring is The 85~95% of the internal diameter of cylindrical outer barrel.
In technical solution of the present invention:Z >=2, described bundled tube dedusting demisting unit is provided with z-1 grades of liquid film altogether from down to up Intercept and collector, described -1 grade of perforated area in collection hole of pth collects the perforated area in hole, 1≤p≤z- more than pth level 1。
In technical solution of the present invention:Between adjacent bundled tube dedusting demisting unit and bundled tube dedusting demisting unit with absorb Lower end seal plate and upper end seal plate are equipped between inner wall of tower.
In technical solution of the present invention:Flushing water system is provided between at least one set of connected eddy flow component;Described rushes Washing system includes wash tub pipe, and the top of described wash tub pipe is provided with flooding nozzle, and the bottom of wash tub pipe is provided with flushing water Pipe joint.
In technical solution of the present invention:Flushing system is provided with the above and or below of at least one-level bundled tube dedusting demister System, described rinse-system includes flushing water main pipe, and some flushing pipe network nozzles are provided with described flushing water main pipe.
Bundled tube dedusting demister is a kind of gas-liquid separator based on centrifugal force separate, using the centrifugation of swirling eddy Effect, the drop that will be carried secretly in air-flow is got rid of to wall peripheral, and the thickness and height of the liquid film of wall can be with the drops in flue gas Increased sharply with amounts of particles, liquid film is blocked up to make operation resistance excessive, and the possibility of reentrainment can be increased when liquid film is too high, these The decline of operating characteristics will be caused.Inventor has found to be intercepted and collector by setting liquid film by repeatedly research, and internal diameter sets Be set to is the 0.85~0.95 of wall internal diameter.It is the liquid energy for upper strata that liquid film interception and collector open up a number of hole Smoothly flow down along wall, and be not inflow flue gas inner side and cause reentrainment.Preferred semicircular hole is mainly It is easy to along wall following current.The total amount of liquid of the total area of perforate in removing flue gas determines.Lower floor than upper strata hole It is many because the liquid on upper strata converges and flows into lower floor.
Beneficial effects of the present invention:
The present invention increases coalescence device by different eddy flow component interlayers, improves fine particle dusts and sprays into coalescence liquid Between drop occur inertial collision, intercept and coalescence probability, improve dust can catching, under equal eddy flow component series Removal efficiency is improved, the eddy flow component series reduction needed for equal efficiency is reached in other words reduces investment and operating cost.
Brief description of the drawings
Fig. 1 is the front view of multistage bundled tube dedusting demister;
Fig. 2 is the A-A sectional views of multistage bundled tube dedusting demister;
Fig. 3 is the B-B sectional views of multistage bundled tube dedusting demister;
Fig. 4 is the second embodiment front view of multistage bundled tube dedusting demister;
Fig. 5 is the 3rd embodiment front view of multistage bundled tube dedusting demister;
Fig. 6 is the front view of liquid film interception and collector;
Wherein:1 is smoke inlet, and 2 is first order bundled tube dedusting demister, and 3 is coalescence device, and 4 restrain for the second level Formula dedusting demister, 5 is exhanst gas outlet, and 6 is upper sealing panel, cylinder centered on 7, and 8 is cylindrical outer barrel, and 9 is swirl vane, and 10 are Atomization conduit, 11 is atomizer, and 12 is atomization conduit adpting flange, and 13 is bundled tube dedusting demisting unit, and 14 spray for flushing Mouth, 15 is wash tub pipe, and 16 is wash tub pipe joint, and 17 is lower sealing plate, and 18 rinse pipe network nozzle, 20 to absorb tower wall, 19 It is flushing water main pipe, 21 is wash tub pipe adpting flange, and 22 is drainpipe, and 23 is that liquid film is intercepted and collector, and 24 to intercept ring, 25 is collection hole.
Specific embodiment
With reference to embodiment, the present invention will be further described, but protection scope of the present invention not limited to this:
Embodiment 1
Such as Fig. 1~3 and 7, a kind of multistage bundled tube dedusting demister, the device is located at the upper of spraying layer in absorption tower Side, described device includes n grades of bundled tube dedusting demister from down to up, in the bundled tube dedusting demister that at least two-stage is connected Between be provided with coalescence device (3);Described bundled tube dedusting demister includes m bundled tube dedusting demisting unit (13), described Z eddy flow component of bundled tube dedusting demisting unit (13) including cylindrical outer barrel (8) and in cylindrical outer barrel (8), Described eddy flow component includes several swirl vanes (9) and a central tube (7), and swirl vane (9) is at an oblique angle It is evenly distributed in the annular section between central tube (7) outer wall and cylindrical outer barrel (8) inwall;Described coalescence device (3) Including atomization conduit (10), described atomization conduit (10) is provided with several atomizers (11);
The coalescence liquid that coalescence device is used is the process water of process water, steam or addition chemical agglomeration agent;
Wherein:N >=2, m >=2, z >=1;
Described addition chemical agglomeration agent is the mixture of high polymer flocculant, wetting agent and inorganic additives, described High polymer flocculant be polyacrylamide, polyethylene glycol oxide, polyvinyl alcohol, in polyvinylpyrrolidone and polyvinylether one Plant or various;Described wetting agent is sulfonated oil, one or more in thio-alcohol, hydrazides class and mercaptan acetals;Described Inorganic additives are sodium phosphate.The process water of more preferably described addition chemical agglomeration agent is that 0.5% is added in process water ~2.5% chemical agglomeration agent, described chemical agglomeration agent be 0.004%~0.25% high polymer flocculant, 0.0002~ 0.02% wetting agent and 0.001~0.05% inorganic additives, remaining is water.
The atomizing particle size of the atomizer (11) is 20~80 μm.
Described connected eddy flow component is provided with liquid film and intercepts and collector (23), and described liquid film is intercepted and collector includes Intercept ring (24) and collect hole (25), described interception ring (24) is positioned at cylindrical outer barrel (8) internal perisporium, described collection hole (25) between cylindrical outer barrel (8) and interception ring (24);Described collection hole (25) is semicircle, circular or waist-hole type, It is preferred that described collection hole (25) is semicircle.
Bundled tube dedusting demisting unit (13) top is provided with baffle ring, and the internal diameter of the baffle ring is cylindrical outer barrel (8) Internal diameter 85~95%.
Z >=2, described bundled tube dedusting demisting unit (13) is provided with z-1 grades of liquid film and intercepts and collector altogether from down to up, Described -1 grade of perforated area in collection hole of pth collects the perforated area in hole, 1≤p≤z-1 more than pth level.
It is equipped between adjacent bundled tube dedusting demisting unit and between bundled tube dedusting demisting unit and absorption inner wall of tower Lower end seal plate (17) and upper end seal plate (6).
Flushing water system is provided between at least one set of connected eddy flow component;Described rinse-system includes wash tub pipe (15), the top of described wash tub pipe (15) is provided with flooding nozzle (14), and the bottom of wash tub pipe (15) is provided with wash tub pipe Joint (16).
Such as Fig. 4, embodiment two gives a kind of multistage bundled tube dedusting demister, its every grade eddy flow component of demister Only one of which, can simplify the design of shower water in this case, and shower water is arranged on at least one-level bundled tube dedusting demister Above and or below be provided with rinse-system, described rinse-system includes flushing water main pipe (20), in described flushing jellyfish Pipe (20) is provided with some flushings pipe network nozzle (19).
Such as Fig. 6, embodiment three then gives a kind of prioritization scheme of embodiment two.Flushing water is rinsing demister eddy flow group While part, part content in flue gas is also increased, treatment load and difficulty are also just improve, in embodiment three, by taking Disappear upper sealing panel 6, and the water droplet that the drop gravitational settling in flushing water and partial fume except under is formed enters demisting unit outer barrel The downward sealing plate 17 of cocurrent in space between absorption tower, and draining can be opened up at sealing plate upper limb under the tower wall on absorption tower Pipe 22 draws outside absorption tower slurries.
Bundled tube dedusting demister is a kind of gas-liquid separator based on centrifugal force separate, using the centrifugation of swirling eddy Effect, the drop that will be carried secretly in air-flow is got rid of to wall peripheral, and fine drop, fine solid particle particle, aerosol in flue gas etc. are micro- The small particle reunion that collides with each other is condensed into big drop, big drop again by the liquid film capture of cyclone cylinder surface, so as to realize and gas phase Separate and remove.Centrifugal force is directly proportional to 3 powers of particle diameter, particle or drop is had enough centrifugal force, particle Or drop must have enough particle diameters, typically, eddy flow component for the particle more than 18 μm separative efficiency up to 99% Left and right, but due to the presence of the factors such as reentrainment, actual efficiency is less than the numerical value, in other words, by one-level (or two Level) after eddy flow component, the particle in flue gas more than 18 μm has been removed substantially, and remainder is mostly less than 18 μm of particle.Examination As shown by data is tested, after wet desulphurization (after spraying layer), the proportion that PM2.5 and PM10 accounts for total particle is at a relatively high, and part power plant is very To having reached 76% and 51% or so, that is to say, that the total amount of this part dust is possible to exceed emission limit (5mg/m3).Adopt Coal-fired hot pilot system research is carried out with said apparatus, 1% chemical agglomeration agent, described chemical radicals are added in process water Poly- agent is 0.004%~0.25% polyacrylamide, 0.0002~0.02% sulfonated oil and 0.001~0.05% phosphoric acid Sodium, remaining is water.Promote electric precipitation to remove the experimental study of PM2.5 in the addition chemical agglomeration agent of electric cleaner inlet flue gas, grind The change of the front and rear PM2.5 concentration of agglomerator addition and its size distribution is studied carefully, has as a result shown, increased using apparatus of the present invention PM2.5 Original four times or so are arrived greatly, electric cleaner outlet PM2.5 concentration reduction by more than 80% under typical condition.Using apparatus of the present invention It is also original four times or so that PM10 is increased to, electric cleaner outlet PM10 concentration reduction by more than 85% under typical condition.

Claims (9)

1. a kind of multistage bundled tube dedusting demister, it is characterised in that:The device is located at the top of spraying layer in absorption tower, institute The device stated includes n grades of bundled tube dedusting demister from down to up, between the bundled tube dedusting demister that at least two-stage is connected It is provided with coalescence device (3);The bundled tube dedusting demister includes m bundled tube dedusting demisting unit (13), described tube bank Z eddy flow component of formula dedusting demisting unit (13) including cylindrical outer barrel (8) and in cylindrical outer barrel (8), it is described Eddy flow component includes several swirl vanes (9) and a central tube (7), uniform point at an oblique angle of swirl vane (9) Cloth is in the annular section between central tube (7) outer wall and cylindrical outer barrel (8) inwall;Described coalescence device (3) is including mist Change pipeline (10), described atomization conduit (10) is provided with several atomizers (11);
The coalescence liquid that coalescence device is used is the process water of process water, steam or addition chemical agglomeration agent;
Wherein:N >=2, m >=2, z >=1;
Described addition chemical agglomeration agent is the mixture of high polymer flocculant, wetting agent and inorganic additives, described height Flocculation of collected object agent is polyacrylamide, polyethylene glycol oxide, polyvinyl alcohol, one kind in polyvinylpyrrolidone and polyvinylether or It is various;Described wetting agent is sulfonated oil, one or more in thio-alcohol, hydrazides class and mercaptan acetals;Described is inorganic Salt additives are sodium phosphate.
2. multistage bundled tube dedusting demister according to claim 1, it is characterised in that:Add the work of chemical agglomeration agent Skill water is 0.5%~2.5% chemical agglomeration agent of addition in process water, and described chemical agglomeration agent is 0.004%~0.25% High polymer flocculant, 0.0002~0.02% wetting agent and 0.001~0.05% inorganic additives, remaining is water.
3. multistage bundled tube dedusting demister according to claim 1, it is characterised in that:The atomizer (11) Atomizing particle size is 20~80 μm.
4. multistage bundled tube dedusting demister according to claim 1, it is characterised in that:Described connected eddy flow component It is provided with liquid film to intercept and collector (23), described liquid film is intercepted and collector includes intercepting ring (24) and collects hole (25), institute , positioned at cylindrical outer barrel (8) internal perisporium, described collection hole (25) is positioned at cylindrical outer barrel (8) and interception for the interception ring (24) stated Between ring (24);Described collection hole (25) is semicircle, circular or waist-hole type, and preferably described collection hole (25) is semicircle Shape.
5. multistage bundled tube dedusting demister according to claim 1, it is characterised in that:Bundled tube dedusting demisting unit (13) top is provided with baffle ring, and the internal diameter of the baffle ring is the 85~95% of the internal diameter of cylindrical outer barrel (8).
6. multistage bundled tube dedusting demister according to claim 1, it is characterised in that:Z >=2, described bundled tube Dedusting demisting unit (13) is provided with z-1 grades of liquid film and intercepts and collector altogether from down to up, described -1 grade of perforate in collection hole of pth Area collects the perforated area in hole, 1≤p≤z-1 more than pth level.
7. multistage bundled tube dedusting demister according to claim 1, it is characterised in that:Adjacent bundled tube dedusting demisting Lower end seal plate (17) and upper end seal plate are equipped between unit and between bundled tube dedusting demisting unit and absorption inner wall of tower (6)。
8. multistage bundled tube dedusting demister according to claim 1, it is characterised in that:In at least one set of connected rotation Flushing water system is provided between stream component;Described rinse-system includes wash tub pipe (15), described wash tub pipe (15) Top is provided with flooding nozzle (14), and the bottom of wash tub pipe (15) is provided with wash tub pipe joint (16).
9. multistage bundled tube dedusting demister according to claim 1, it is characterised in that:Removed at least one-level bundled tube The above and or below of dirt demister is provided with rinse-system, and described rinse-system includes flushing water main pipe (20), described Flushing water main pipe (20) is provided with some flushings pipe network nozzle (19).
CN201710021193.2A 2017-01-11 2017-01-11 A kind of multistage bundled tube dedusting demister Pending CN106823646A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107519700A (en) * 2017-10-09 2017-12-29 广州舒创有限公司 Pneumatic emulsifying processing unit
CN111589288A (en) * 2020-07-10 2020-08-28 阳春新钢铁有限责任公司 Desulfurization, denitrification and white removal device for ultralow emission of flue gas of sintering machine and process thereof
CN113018990A (en) * 2021-03-04 2021-06-25 张新猛 Wind energy dust removal defogging device
CN113477009A (en) * 2021-07-20 2021-10-08 江苏华星电力环保设备有限公司 Wet-type dust removal defogging integrated device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107519700A (en) * 2017-10-09 2017-12-29 广州舒创有限公司 Pneumatic emulsifying processing unit
CN111589288A (en) * 2020-07-10 2020-08-28 阳春新钢铁有限责任公司 Desulfurization, denitrification and white removal device for ultralow emission of flue gas of sintering machine and process thereof
CN113018990A (en) * 2021-03-04 2021-06-25 张新猛 Wind energy dust removal defogging device
CN113477009A (en) * 2021-07-20 2021-10-08 江苏华星电力环保设备有限公司 Wet-type dust removal defogging integrated device

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