CN106823742A - A kind of desulfurization and dust-removal method of double circulation desulphurization and dust-removing device and flue gas - Google Patents
A kind of desulfurization and dust-removal method of double circulation desulphurization and dust-removing device and flue gas Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2247/00—Details relating to the separation of dispersed particles from gases, air or vapours by liquid as separating agent
- B01D2247/10—Means for removing the washing fluid dispersed in the gas or vapours
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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Abstract
The invention discloses a kind of double circulation desulphurization and dust-removing device and the desulfurization and dust-removal method of flue gas, wherein, double circulation desulphurization and dust-removing device includes：Tower body with smoke inlet and exhanst gas outlet；One-level spraying layer, positioned at the top of smoke inlet；One-level liquid storage bucket, positioned at the lower section of one-level spraying layer；One-level spray pump, is connected with one-level liquid storage bucket, one-level spraying layer respectively；Two grades of spraying layers, positioned at the top of one-level spraying layer；Two grades of liquid storage buckets, positioned at the top of one-level spraying layer；Two grades of spray pumps, are connected with two grades of liquid storage buckets, two grades of spraying layers respectively；Venturi tube, in two grades of liquid storage buckets.The desulfurization and dust-removal method of flue gas：Flue gas removes most of pollutant in flue gas after one-level is sprayed, then by two grades of spray reinforcing desulfuration dust removing effects, so as to meet fume emission requirement.Desulfation dust-extraction device integrated level of the invention is high, small volume, floor space are small, and desulfurization dust-removing efficiency is high.
Description
Technical field
The present invention relates to fume desulfurizing and dedusting technology design field, more particularly to a kind of double circulation desulphurization and dust-removing device and cigarette
The desulfurization and dust-removal method of gas.
Background technology
As the promulgation of new environmental regulation is performed, the Con trolling index to flue gas pollutant discharge is more and more tighter, general to require
SO2Concentration of emission is less than 100mg/m3, key area is less than 50mg/m3, granular material discharged concentration is less than 50mg/m3, key area
Less than 20mg/m3.Even some areas coal-burning power plant starts to perform " ultra-clean discharge " (sulfur dioxide, granular material discharged concentration
Respectively no higher than 35mg/m3、10mg/m3).This requires that flue gas desulfurization dust-removal system has desulfurization very high and efficiency of dust collection.
, in order to reach above-mentioned desulfuration efficiency, it is necessary to configure more spraying layer, desulfurization tower height degree can be very high, energy for traditional sulfur removal technology
Consumption increases wet electric dust collector also than larger, and for efficiency of dust collection higher after desulphurization plant, and floor space is big, equipment
Investment is high.
Chinese invention patent CN201510315376.6, subject name is that a kind of dust-removal and desulfurizing cooperates with processing unit, the hair
It is bright disclose in a tower body by flow of flue gas direction be sequentially provided with one-level flue-gas dust-removing and desulfurization area, secondary smoke dust-removal and desulfurizing area and
Demister, but the equipment of the storage reacting slurry in secondary smoke dust-removal and desulfurizing area is arranged at the outside of device, floor space
Larger, the desulfuration efficiency of the invention is 99%, and efficiency of dust collection is 75%, thus the fume treatment effect higher to sulfur content compared with
Difference, it is impossible to reach environmental protection standard.
Therefore, the applicant is devoted to providing the desulfurization and dust-removal method of a kind of double circulation desulphurization and dust-removing device and flue gas.
The content of the invention
It is an object of the invention to provide a kind of double circulation desulphurization and dust-removing device and the desulfurization and dust-removal method of flue gas, it is to sulfur-bearing
The treatment effect of amount flue gas higher preferably, can meet existing environmental requirement, and the integrated level of device is higher, small volume,
Floor space is small.
In order to solve the above technical problems, the invention provides a kind of single column double circulation desulphurization and dust-removing device, including：Tower body,
Exhanst gas outlet including the smoke inlet for being arranged at the lower section of the tower body and the top for being arranged at the tower body；One-level is sprayed
Layer, is arranged in the tower body, and positioned at the top of the smoke inlet；One-level liquid storage bucket, is arranged in the tower body, and position
In the lower section of the one-level spraying layer, for collecting one-level Sprayer Circulation liquid；One-level spray pump, its inlet stretches to described one
The top of level liquid storage bucket, its liquid outlet is connected with the one-level spraying layer；Two grades of spraying layers, are arranged in the tower body, and position
In the top of the one-level spraying layer；Two grades of liquid storage buckets, are arranged in the tower body, and positioned at the upper of the one-level spraying layer
Side, for collecting two grades of Sprayer Circulation liquid；Two grades of spray pumps, its inlet stretches to the bottom of two grades of liquid storage buckets, and it goes out
Liquid mouthful is connected with two grades of spraying layers；Venturi tube group, including multiple Venturi tubes, are located in two grades of liquid storage buckets,
The entrance of the Venturi tube is located at two grades of liquid storage buckets near the side of the one-level spraying layer, and the Venturi tube goes out
Mouth is located at side of the two grades of liquid storage buckets away from the one-level spraying layer；Demister, positioned at two grades of spraying layers with it is described
Between the exhanst gas outlet of tower body.
Preferably, two grades of spraying layers include multiple two grades of sub- upper and lower spraying layer upper strata spraying layers of spraying layer and lower floor
Spraying layer；Lower floor's spraying layer is located at two grades of liquid storage buckets near the one-level spraying layer under one of them described two grades of son
Side, the number of Venturi tube is identical under this two grades of sons and in shower nozzle number and the venturi layer of lower floor's spraying layer
And correspond, and its shower nozzle is towards the entrance of the Venturi tube, for two grades of Sprayer Circulation liquid spray liquids for spraying it
Enter in Venturi tube jointly with flue gas；On remaining described two grades of son the upper strata spraying layer be located at two grades of liquid storage buckets away from
The side of the one-level spraying layer, and the upper strata spraying layer shower nozzle directly over the outlet of the Venturi tube, towards dividing into
Put, and two grades of Sprayer Circulation liquid of upper strata spraying layer spray do not enter in the Venturi tube, spray liquid forms cascade will
Venturi tube is covered, and ensures that spray liquid does not enter in Venturi tube.
Preferably, the double circulation desulphurization and dust-removing device also includes：Chilling spraying layer, the flue gas for being arranged on the tower body enters
At mouthful, and its inlet is connected with the liquid outlet of the one-level spray pump.
Preferably, the double circulation desulphurization and dust-removing device also includes：Overflow pipe, is arranged in the tower body, its first end
Positioned at the top of two grades of liquid storage buckets, the second end is located at the lower section of two grades of liquid storage buckets, and its first end is less than the text
The port of export of mound nexine, the overflow pipe is used to for two grades of Sprayer Circulation liquid unnecessary in two grades of liquid storage buckets to be directed into described one
In level liquid storage bucket.
Preferably, the one-level liquid storage bucket and two grades of liquid storage buckets include a supply port, and the supply port is followed for supplement
Ring liquid and water, and the circulation fluid of supplement is selected from NaOH solution, ammoniacal liquor, limewash or CaO solution；And/or；The one-level spray
Drenching layer includes 2~6 layers of sub- spraying layer of one-level.
In order to solve the above technical problems, the present invention provides a kind of desulfurization and dust-removal method of flue gas, comprise the following steps：Flue gas
One-level spraying layer and two grades of spraying layers are sequentially passed through from bottom to up, and the one-level spraying layer carries out one-level spray process to flue gas,
Two grades of spraying layers carry out two grades of spray process to flue gas, and by the flue gas after the one-level spray process by venturi
Guan Houzai carries out two grades of spray process, speed first increases and then decreases of the flue gas in the Venturi tube.
Preferably, the pH value of the one-level Sprayer Circulation liquid that the one-level spray process is used is less than two grades of spray process
The two grades of pH values of Sprayer Circulation liquid for using.
Preferably, PH=5~7 of the one-level Sprayer Circulation liquid, PH=6~7 of two grades of Sprayer Circulation liquid.And institute
State PHs of two grades of PH of Sprayer Circulation liquid higher than one-level Sprayer Circulation liquid.
Preferably, the one-level Sprayer Circulation liquid for being used by the one-level spray process is carried out to the flue gas at gas approach
Quenching makes the reduction of its temperature.
Preferably, 50~60 DEG C are reduced to by the temperature of the flue gas after the quenching.
The process and its device of Two-way Cycle efficient desulfurizing and dust collecting of the invention can realize that following at least one is beneficial
Effect.
1st, desulfation dust-extraction device of the invention is provided with one group of Venturi tube to flue gas reinforcing gas at two grades of spray process
Liquid phase interaction.Flue gas is by after primary cycle spray desulfurization and dedusting, carrying a small amount of drop and entering Venturi tube, flue gas and drop
It is accelerated in venturi marquis mouthful, because of gas, the effect of inertia of drop, gas-liquid two-phase forms larger speed difference, enhances gas
The rapid punching of liquid, collision effect, are fully contacted gas-liquid two-phase, greatly reduce SO2The air film resistance of dissolving, makes SO2It is easily molten
In slurries, the desulfurized effect of flue gas is enhanced；Meanwhile, particulate matter also accelerates in Venturi tube in flue gas, particulate matter and drop
The fierce collision of generation and cohesion, the air film of surface particles attachment are broken through, and are spontaneously wet out by water particulate matter, by Venturi tube
Afterwards, gas-liquid speed reduces and pressure gos up, and the cohesion with particulate matter as the nuclei of condensation is accelerated, and is condensed into the dust-laden being relatively large in diameter
Drop, the drop of cohesion traps sedimentation by the water droplet of venturi top spray, enhances the removal effect for tiny particles content,
And then reached preferable desulfurization and dedusting effect.
2nd, be arranged at for one-level liquid storage bucket and two grades of liquid storage buckets same by the device for flue gas desulfurization and dedusting in the present invention
In device, integrated level is higher, greatly reduces the cumulative volume and floor space of device.
3rd, the device for flue gas desulfurization and dedusting of the invention is provided with demister at two grades between spraying layer and exhanst gas outlet,
Demister can remove the droplet carried in flue gas after spray process, due to can also be with acidity except with vapor in droplet
Drop, if can cause the corrosion of follow up device in being directly discharged into aftertreatment device, reduces service life, if entering in air
Pollute the environment.
4th, desulfation dust-extraction device of the invention is provided with an overflow pipe in tower body, and overflow pipe can be by two grades of liquid storage buckets
Secondary cycle liquid is entered in one-level liquid storage bucket, it is ensured that the liquid level in two grades of liquid storage buckets is not above being opened above Venturi tube
Open height, prevents two grades of cycle hydrorrheas in two grades of liquid storage buckets from flowing in Venturi tube, and then causes the flue gas cannot be by literary mound
In manage.
5th, in desulfurization and dust-removal method of the invention in two grades of liquid storage buckets, fresh water and alkali lye, secondary cycle liquid are continuously replenished
In quick being continuously updated, equivalent to clear water spray, during flue gas can carry a small amount of slurries to demister in traditional handicraft, and starch
The a large amount of particulate matters and alkali lye contained in liquid can cause demister fouling, block, in the secondary cycle liquid in this method containing
Grain thing is less, it is possible to reduce demister live load, improves efficiency of dust collection.
6th, the present invention disclosed in device and process can process sulfur content be up to 2% flue gas it is " super clean to meeting
Net discharge " standard.
Brief description of the drawings
The present invention is described in further detail with reference to the accompanying drawings and detailed description：
Fig. 1 is a kind of structural representation of specific embodiment of the invention.
Drawing reference numeral explanation：
1- tower bodies, 2- smoke inlets, 3- exhanst gas outlets, 4- one-levels spraying layer, 5- one-level liquid storages bucket, spray pump of 6-,
Bis- grades of spraying layers of 7-, bis- grades of liquid storage buckets of 8-, bis- grades of spray pumps of 9-, 10- venturi tube layer, 11- overflow pipes, 12- demisters, 13-
The addition mouthful of chilling spraying layer, A- smoke inlets direction, B- exhanst gas outlets direction, bis- grades of Sprayer Circulation liquid of C- and water.
Specific embodiment
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Embodiment one
As shown in figure 1, embodiment one discloses a kind of Two-way Cycle high-efficient desulfation dust-extraction device, including：Tower body 1, including set
The smoke inlet 2 for being placed in the lower left of tower body 1 and the exhanst gas outlet 3 at the top for being arranged at tower body 1；One-level spraying layer 4, is arranged on
In tower body 1 and positioned at the top of smoke inlet 2, in the present embodiment, one-level spraying layer 4 includes the sub- spraying layer of two-layer one-level；One-level
Liquid storage bucket 5, is arranged in tower body 1 and positioned at the lower section of one-level spraying layer 4, for collecting one-level Sprayer Circulation liquid；Chilling is sprayed
Layer 13, is arranged in tower body 1 and near smoke inlet 2, for cooling down the flue gas entered from smoke inlet 2；One-level spray pump
6, its inlet is stretched in one-level liquid storage bucket 5, and its liquid outlet is divided into the two-layer one of two parts, a part and one-level spraying layer 4
The sub- spraying layer of level is connected, and another part is connected with chilling spraying layer；Two grades of spraying layers 7, are arranged in tower body 1 and positioned at one-level spray
The top of drenching layer 4；Two grades of liquid storage buckets 8, are made up of stainless steel plate connection, and two grades of liquid storage buckets 8 are a bottom pyramidal liquid storage bucket, are set
In tower body 1 and positioned at the top of one-level spraying layer 4, for collecting two grades of spray liquid Sprayer Circulation liquid；Two grades of spray pumps 9, its
Inlet stretches to two grades of bottoms of liquid storage bucket 8, and its liquid outlet is connected with two grades of spraying layers 7；Venturi tube layer 10, including multiple
Venturi tube, is located in two grades of liquid storage buckets 8, and the entrance of Venturi tube is located at two grades of liquid storage buckets 8 near one-level spraying layer 4
Side (two grades of lower sections of liquid storage bucket 8 i.e. shown in Fig. 1), the outlet of Venturi tube is located at two grades of liquid storage buckets 8 away from one-level
The side (two grades of tops of liquid storage bucket 8 i.e. shown in Fig. 1) of spraying layer 4；Demister 12, positioned at two grades of spraying layers 7 and tower body 1
Exhanst gas outlet between.Wherein, one-level liquid storage bucket 5 and two grades of liquid storage buckets 8 include a supply port, and supply port is used for replenishment cycles
Liquid and water, and the circulation fluid of supplement is NaOH solution.
Wherein, two grades of spraying layers 7 include upper strata spraying layer and lower floor's spraying layer, and wherein lower floor's spraying layer is located at two grades of liquid storages
Bucket 8 is near the side (two grades of lower sections of liquid storage bucket 8 i.e. shown in Fig. 1) of one-level spraying layer 4, this two grades of shower nozzles of sub- spraying layer
Number is identical with the number of Venturi tube in venturi tube layer 10 and corresponds, and its shower nozzle is towards the entrance of Venturi tube,
The cycle liquid that it is sprayed out enters in Venturi tube jointly with flue gas.Venturi tube layer includes 4 venturi in the present embodiment
Pipe.Upper strata spraying layer be located at two grades of liquid storage buckets 8 away from one-level spraying layer 4 side (two grades of liquid storage buckets 8 i.e. shown in Fig. 1
Top) and shower nozzle set down, cycle liquid that it is sprayed out forms taper cascade and lives Venturi tube mouth mask, and upper strata spraying layer
The spray liquid of spray is not entered into Venturi tube.By the addition mouthful C of two grades of Sprayer Circulation liquid and water in two grades of liquid storage buckets
Increase by two grades of Sprayer Circulation liquid and clear water.
In the present embodiment, an overflow pipe 11 is provided with tower body 1, its first end (upper end of the overflow pipe 11 in such as Fig. 1)
Positioned at two grades of tops of liquid storage bucket 8, and its first end is less than the port of export of venturi tube layer, its second end (overflow in such as Fig. 1
The lower end of pipe 11) two grades of lower sections of liquid storage bucket 8 are located at, close to the bottom of one-level liquid storage bucket 5, overflow pipe 11 is used for will at its second end
Two grades of Sprayer Circulation liquid unnecessary in two grades of liquid storage buckets 8 are directed into one-level liquid storage bucket 5.
Two-way Cycle high-efficient desulfation dust-extraction device in the present embodiment is provided with two sets of circulated sprinkling systems, phase in a tower body
For traditional double-column in series sulfur removal technology, floor space of the invention is smaller, equipment investment less, system pressure drop is smaller, also,
By using Venturi tube, interaction of gas and liquid is enhanced, increased mass-transfer efficiency, substantially increased desulfuration efficiency and imitated with dedusting
Really, the desulfuration efficiency of the present embodiment is up to 99.8%, and efficiency of dust collection is up to 95%, with preferable effect.Meanwhile, can be by sulphur
Content is up to 2% fume treatment to the standard for meeting " ultra-clean discharge ".
Embodiment two
Embodiment two discloses another specific embodiment of Two-way Cycle high-efficient desulfation dust-extraction device, embodiment two and implementation
The double circulation desulphurization and dust-removing device that example one is used is substantially the same with technological process condition, unlike, in the present embodiment, one
The alkali lye of level liquid storage bucket and two grades of supply port supplements of liquid storage bucket is lime aqueous solution, and one-level spraying layer sets one-level that is of five storeys
Spraying layer, secondary cycle are provided with 6 groups of Venturi tubes.
Lime aqueous solution has been used to enter to flue gas with two grades of Sprayer Circulation liquid as one-level Sprayer Circulation liquid in the present embodiment
Row treatment, the desulfuration efficiency of the invention is 99.6%, and efficiency of dust collection is 94.3%, and sulfur content can be up at 2% flue gas
Manage to the standard for meeting " ultra-clean discharge ".
Embodiment three
Embodiment three discloses another specific embodiment of Two-way Cycle high-efficient desulfation dust-extraction device, embodiment three and implementation
The double circulation desulphurization and dust-removing device that example one is used is substantially the same with technological process condition, the difference is that one-level liquid storage bucket and two grades
The alkali lye of the supply port supplement of liquid storage bucket is ammonia spirit, and one-level spraying layer is provided with 6 layers of sub- spraying layer of one-level, secondary cycle and sets
There are 8 groups of Venturi tubes.
Ammonia spirit has been used in the present embodiment to be carried out with two grades of Sprayer Circulation liquid as one-level Sprayer Circulation liquid to flue gas
Treatment, the desulfuration efficiency of the invention is 99.7%, and efficiency of dust collection is 94.5%, and sulfur content can be up to 2% fume treatment
To the standard for meeting " ultra-clean discharge ".
One embodiment three is arrived in conjunction with the embodiments, can obtained：Use device and fume desulfurizing and dedusting technology in the present invention
Treatment flue gas is carried out, desulfuration efficiency can reach 99.8%, efficiency of dust collection and can reach 95%, and then it is super to process sulfur content
2% flue gas is crossed, is had with efficiency of dust collection compared to desulfuration efficiency of the prior art and is significantly improved, and due in the present invention
One-level liquid storage bucket and two grades of liquid storage buckets are all arranged in same tower body, and integrated level is high, and floor space is smaller, with preferable economy
Interests.
Of course, in other specific embodiments, one-level liquid storage bucket and two grades of supply ports of liquid storage bucket in the present invention are mended
The alkali lye for filling can also be conventional alkali lye in CaO solution or other flue gas desulfurizations treatment；One-level spraying layer can also be by 3
Layer, 4 layers of sub- spraying layer composition of one-level, one-level spraying layer and two grades of numbers of plies of spraying layer are determined by specifically needing, as long as can make
The flue gas for obtaining must finally be processed and meet " ultra-clean discharge " standard, here is omitted.
Example IV
Present embodiment discloses a kind of desulfurization and dust-removal method of flue gas, the device that it is used is double disclosed in embodiment one
Circulation desulfurization dust arrester, process step is：Flue gas enters tower body along smoke inlet, and chilling spraying layer carries out chilling to flue gas
Treatment, makes the temperature of flue gas be reduced to 50~60 DEG C, and one-level spraying layer spray one-level Sprayer Circulation liquid enters to the flue gas after chilling
Row one-level spray process, two grades of spraying layers spray two grades of Sprayer Circulation liquid carries out two grades of sprays to the flue gas after one-level spray process
Treatment, to carrying out demisting treatment by the flue gas after two grades of spray process, flue gas after demisting treatment is from exhanst gas outlet for demister
Discharge.
By the flue gas after one-level spray process by carrying out two grades of spray process after Venturi tube again, flue gas is in venturi
Guan Zhongxian accelerates to slow down again.
Wherein, during the spray respectively to one-level Sprayer Circulation liquid and two grades of Sprayer Circulation liquid in supplement alkali lye, mend
The alkali lye for filling be selected from NaOH solution, ammoniacal liquor, limewash or CaO solution, and one-level Sprayer Circulation liquid PH=5~7, two grades spray
Drench PH=6~7 of circulation fluid.
Desulfurization and dust-removal method process is simple in the present embodiment so that gas-liquid two-phase contact is abundant, substantially increases desulfurization
Efficiency and dust removing effects, the desulfuration efficiency of the present embodiment are up to 99.8%, and efficiency of dust collection is 95%, in hgher efficiency.By this side
Method, can be up to 2% fume treatment to the standard for meeting " ultra-clean discharge " by sulfur content.
Of course, in the other embodiments of the desulfurization and dust-removal method of flue gas of the invention, one-level, two grades of Sprayer Circulation liquid
PH and quenching after the temperature of flue gas can be adjusted according to actual needs, one-level Sprayer Circulation liquid and two grades of sprays
Drenching circulation fluid can also be including ammoniacal liquor, limewash or alkaline solution etc. CaO solution, and here is omitted.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of double circulation desulphurization and dust-removing device, it is characterised in that including：
Tower body, including be arranged at the tower body lower section smoke inlet and be arranged at the tower body top exhanst gas outlet；
One-level spraying layer, is arranged in the tower body, and positioned at the top of the smoke inlet；
One-level liquid storage bucket, is arranged in the tower body, and positioned at the lower section of the one-level spraying layer, is followed for collecting one-level spray
Ring liquid；
One-level spray pump, its inlet stretches to the top of the one-level liquid storage bucket, and its liquid outlet connects with the one-level spraying layer
Connect；
Two grades of spraying layers, are arranged in the tower body, and positioned at the top of the one-level spraying layer；
Two grades of liquid storage buckets, are arranged in the tower body, and positioned at the top of the one-level spraying layer, are followed for collecting two grades of sprays
Ring liquid；
Two grades of spray pumps, its inlet stretches to the bottom of two grades of liquid storage buckets, and its liquid outlet connects with two grades of spraying layers
Connect；
Venturi tube layer, including multiple Venturi tubes, are located in two grades of liquid storage buckets, and the entrance of the Venturi tube is located at
Two grades of liquid storage buckets are near the side of the one-level spraying layer, and the outlet of the Venturi tube is remote positioned at two grades of liquid storage buckets
From the side of the one-level spraying layer；
Demister, between two grades of spraying layers and the exhanst gas outlet of the tower body.
2. double circulation desulphurization and dust-removing device as claimed in claim 1, it is characterised in that：
Two grades of spraying layers include upper strata spraying layer and lower floor's spraying layer；
Lower floor's spraying layer is located at two grades of liquid storage buckets near the side of the one-level spraying layer, and lower floor's spraying layer
Shower nozzle number and the venturi layer in Venturi tube number it is identical and correspond, and its shower nozzle is towards the venturi
The entrance of pipe, two grades of Sprayer Circulation liquid and flue gas for spraying it enter in Venturi tube jointly；
The upper strata spraying layer is located at side of the two grades of liquid storage buckets away from the one-level spraying layer, and the upper strata spraying layer
Shower nozzle above the outlet of the Venturi tube, set down, and the upper strata spraying layer spray two grades of Sprayer Circulation liquid
Do not enter in the Venturi tube.
3. double circulation desulphurization and dust-removing device as claimed in claim 1, it is characterised in that also include：
Chilling spraying layer, is arranged at the smoke inlet of the tower body, and its inlet and the one-level spray pump liquid outlet
Connection.
4. double circulation desulphurization and dust-removing device as claimed in claim 1, it is characterised in that also include：
Overflow pipe, is arranged in the tower body, and its first end is located at the top of two grades of liquid storage buckets, and the second end is located at described two
The lower section of level liquid storage bucket, and its first end, less than the port of export of venturi layer, the overflow pipe is used for two grades of liquid storage buckets
In unnecessary two grades of Sprayer Circulation liquid be directed into the one-level liquid storage bucket.
5. double circulation desulphurization and dust-removing device as claimed in claim 1, it is characterised in that：
The one-level liquid storage bucket and two grades of liquid storage buckets include a supply port, and the supply port is used for replenishment cycles liquid and water, and
The circulation fluid of supplement is selected from NaOH solution, ammoniacal liquor, limewash or CaO solution；
And/or；
The one-level spraying layer includes 2~6 layers of sub- spraying layer of one-level.
6. a kind of desulfurization and dust-removal method of flue gas, it is characterised in that：
Flue gas sequentially passes through one-level spraying layer and two grades of spraying layers from bottom to up, and the one-level spraying layer carries out one-level spray to flue gas
Pouring is processed, and two grades of spraying layers carry out two grades of spray process to flue gas, and by the flue gas warp after the one-level spray process
Two grades of spray process, speed first increases and then decreases of the flue gas in the Venturi tube are carried out again after crossing Venturi tube.
7. the desulfurization and dust-removal method of flue gas as claimed in claim 6, it is characterised in that：
The pH value of the one-level Sprayer Circulation liquid that the one-level spray process is used is less than two grades that two grades of spray process are used
The pH value of Sprayer Circulation liquid.
8. the desulfurization and dust-removal method of flue gas as claimed in claim 7, it is characterised in that：
PH=5~7 of the one-level Sprayer Circulation liquid, PH=6~7 of two grades of Sprayer Circulation liquid.
9. the desulfurization and dust-removal method of flue gas as claimed in claim 6, it is characterised in that：
The one-level Sprayer Circulation liquid used by the one-level spray process carries out quenching to the flue gas at gas approach to be made
The reduction of its temperature.
10. the desulfurization and dust-removal method of flue gas as claimed in claim 6, it is characterised in that：
50~60 DEG C are reduced to by the temperature of the flue gas after the quenching.
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| CN201710083598.9A CN106823742A (en) | 2017-02-16 | 2017-02-16 | A kind of desulfurization and dust-removal method of double circulation desulphurization and dust-removing device and flue gas |
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| CN114570149A (en) * | 2021-12-29 | 2022-06-03 | 无锡红旗除尘设备有限公司 | Electric furnace dust removal system for steelmaking process |
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Application publication date: 20170613 |