CN107469600A - A kind of composite bed purifying column - Google Patents
A kind of composite bed purifying column Download PDFInfo
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- CN107469600A CN107469600A CN201710887631.3A CN201710887631A CN107469600A CN 107469600 A CN107469600 A CN 107469600A CN 201710887631 A CN201710887631 A CN 201710887631A CN 107469600 A CN107469600 A CN 107469600A
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- bed
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- mixing chamber
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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
- B01D53/76—Gas phase processes, e.g. by using aerosols
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/30—Particle separators, e.g. dust precipitators, using loose filtering material
- B01D46/32—Particle separators, e.g. dust precipitators, using loose filtering material the material moving during filtering
- B01D46/34—Particle separators, e.g. dust precipitators, using loose filtering material the material moving during filtering not horizontally, e.g. using shoots
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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
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/302—Sulfur oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/60—Heavy metals or heavy metal compounds
- B01D2257/602—Mercury or mercury compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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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
- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
- B01D53/06—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 by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
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Abstract
The present invention relates to a kind of composite bed purifying column, including purifying column main body and spray ammonia system, the purifying column main body is sequentially provided with desulfurization bed, spray ammonia mixing chamber, denitration bed by air inlet side to outlet side；Desulfurization bed is connected with pending flue gas, and spray ammonia mixing chamber is connected with desulfurization bed, and denitration bed is connected with spray ammonia mixing chamber.Desulfurization bed and denitration bed are located in same tower body by the present invention, compact-sized, save space, reduce equipment overall cost.Using by the way of the narrow cavity cross-flow of spray ammonia mixing chamber at a high speed spray ammonia, gas injection kinetic energy is made full use of to realize that forced convertion mixes, mass-transfer efficiency is high, can realize ammonia being uniformly distributed in mezzanine space in a short time, denitration efficiency is improved, reduces secondary pollution of the escaping of ammonia to environment.Largely reduce the thickness of denitration bed, so as to reduce overall pressure drop of the flue gas by purifying column, reduce equipment operation energy consumption.
Description
Technical field：
Can be to containing sulfur dioxide SO the present invention relates to one kind2, nitrogen oxides NOx, dust, the pollutant such as mercury, bioxin
The column for smoke purification disposably removed, especially a kind of composite bed purifying column.
Background technology：
Flue Gas Purification Technology Using Activated Coke is a kind of dry FGD process technology of resourcebility, can be dirty in efficient removal flue gas
Contaminate dust, the sulfur dioxide SO in thing2, nitrogen oxides NOX, the pollutant such as mercury, bioxin, and save the water resource of preciousness, it is right
Environment non-secondary pollution, suitable for purification coal-fired flue-gas, flue gas of refuse burning, sintering flue gas etc..
Flue Gas Purification Technology Using Activated Coke is using activated coke particle as adsorbent, when flue gas passes through the bed containing activated coke,
Sulfur dioxide S0 in flue gas2It is adsorbed onto on active coke adsorbent, then the sulfuric acid H by catalysis oxidation for ADSORPTION STATE2S04, exist
In in the middle micropore of activated carbon；Nitrogen oxides NOXWith the ammonia NH of reproducibility3Generation selective catalytic reduction reaction, generation are harmless
Nitrogen N2With water H20.The adsorbed reaction of mercury, He bioxin removes, and noxious fume with activated coke particles collision then by catching
Mode removes.
With the progress of suction-operated, absorption of the activated coke to harmful substance can gradual saturation, the activated coke of adsorption saturation
Under gravity from purification tower bottom discharge, after regeneration recovers adsorption capacity, entering at the top of purifying column, carrying out
Recycle.
Integrated removing system for needing simultaneous SO_2 and NO removal, ammonia NH3With sulfur dioxide SO2Reaction, ammonia
NH3With nitrogen oxides NOXReaction, the two has the relation of competitive reaction, as sulfur dioxide SO2Concentration exceedes finite concentration,
Most ammonia NH3Will be with sulfur dioxide SO2Chemically reacted in activated coke, generate sulfuric acid ammonia salt or ammonium sulfite
Salt, so as to largely be consumed, it can not ensure and nitrogen oxides NOXThe ammonia concentration of reaction, so as to reduce nitrogen oxides NOX's
Removal efficiency.If by the way of excessively ammonia is sprayed, it can not only increase ammonia NH3Dosage, improve plant running cost, Er Qiewei
Ammonia that is reacted and escaping can cause the secondary pollution of environment.In addition, ammonia and sulfur dioxide SO2React the ammonium salt of generation
Easily cause activated coke particle from caking, cause solid material flowing jam and bed localized hyperthermia.
In order to solve ammonia NH3With sulfur dioxide SO2, ammonia NH3With nitrogen oxides NOXCompetitive reaction problem,
By the way of two purifying column arranged in series, pending flue gas removes after desulfurizing tower 01 by US4400363, US5053210
Most sulfur dioxide SO2, denitrating tower 02 is entered after then being mixed again with ammonia NH3,02 in denitrating tower in, remove flue gas
In nitrogen oxides NOXAnd remaining a small amount of sulfur dioxide SO2.So as to reach sulfur dioxide SO2With nitrogen oxides NOXSimultaneously
The purpose of removing.Activated coke after the regeneration of desulfurizing tower 01 is entered by top, is discharged after adsorption saturation from bottom；Denitrating tower 02
Enter after regeneration at the top of activated coke, discharged after adsorption saturation from bottom.This mode needs two purifying columns of separately fabricated installation,
Floor space is big, high equipment cost.Flue gas is increased by the pressure drop of device simultaneously, causes the increase of plant running energy consumption.
A kind of cross-current type twin-stage moving-bed active coke disclosed in CN103349892A discards integrated purification tower, from top to bottom cloth
Desulfurization zone and denitration region are equipped with, but equipment whole height is big, requires harsh to material lift equipment, and desulfurization zone and denitration
The activated coke flow velocity in area mutually restricts, and can not realize the independent control of respective region activation Jiao flow velocity.
CN102824810B, CA1193929A1 are using the desulfurization denitration method that ammonia is sprayed in activated coke bed, by work
Property coke bed layer in insert a number of ammonia nozzle, flue gas and ammonia NH3Mixed and produced anti-in activated coke bed
Should.But this hybrid mode, activated coke directly contact with ammonia nozzle, it is active that longtime running likely results in spray ammonia nozzle
Coke powder blocks.In addition, the ammonia of injection directly impacts activated coke particle, cause it to spray kinetic energy and lose rapidly, gas can only be leaned on
Mutual diffusion is mixed with flue gas, and mass transport process is slow, it is difficult to is ensured in limited Residence Time
Realize with flue gas and sufficiently uniformly mix.
The content of the invention：
The purpose of the present invention is that for above-mentioned the deficiencies in the prior art, there is provided one kind can be completed pair in a tower body
Dust, sulfur dioxide SO2, nitrogen oxide NOx, the pollutant such as mercury, bioxin disposably removed, compact-sized, purification
Efficiency high, a kind of small composite bed purifying column of droop loss.
The purpose of the present invention is achieved through the following technical solutions：
A kind of composite bed purifying column, including purifying column main body I and spray ammonia system II, the purifying column main body I is by air inlet
Side is sequentially provided with desulfurization bed 1, spray ammonia mixing chamber 2, denitration bed 3 to outlet side；Desulfurization bed 1 is connected with pending flue gas
Logical, spray ammonia mixing chamber 2 is connected with desulfurization bed 1, and denitration bed 3 is connected with spray ammonia mixing chamber 2, flue gas and denitration after processing
Bed 3 is connected；
The air inlet side of desulfurization bed 1 is provided with desulfurization bed front side wall 101, is provided between desulfurization bed 1 and spray ammonia mixing chamber 2
Denitration bed front side wall 301 is provided between desulfurization bed rear wall 102, spray ammonia mixing chamber 2 and denitration bed 3, denitration bed 3 goes out
Gas side is provided with denitration bed rear wall 302；
From desulfurization bed front side wall 101 to the longitudinally connected plate 5 being provided with denitration bed rear wall 302, longitudinally connect
Spacing between fishplate bar 5 is 2000mm~3000mm；
Spray ammonia system II includes 401,10~15 ammonia branched pipes 402 of ammonia main pipeline and 5~10 ammonia nozzles
403, ammonia main pipeline 401 is arranged in the outside of spray ammonia mixing chamber 2, and ammonia branched pipe 402 and ammonia nozzle 403 are arranged on spray ammonia
In the cavity of mixing chamber 2.
Desulfurization bed front side wall 101 is shutter or strip-type grille, and the desulfurization bed rear wall 102 is shutter, institute
It is shutter to state denitration bed front side wall 301, and the denitration bed rear wall 302 is shutter or gillis.
Pending flue gas first passes through desulfurization bed front side wall 101 and is introduced into desulfurization bed 1, then by desulfurization bed rear wall
102 enter spray ammonia mixing chamber 2, after the ammonia sprayed in the spray cavity of ammonia mixing chamber 2 with ammonia nozzle 403 is sufficiently mixed, then pass through
Cross denitration bed front side wall 301 and enter rear portion denitration bed 3, eventually pass through and discharged through denitration bed rear wall 302.
The ammonia that the ammonia nozzle 403 is sprayed up and down while is sprayed, and cross-flow is formed with flow of flue gas direction.
The ammonia nozzle 403 is evenly arranged in the horizontal direction, the level interval between two neighboring ammonia nozzle 403
For 400mm~1600mm.
The longitudinally connected plate 5 and desulfurization bed front side wall 101, desulfurization bed rear wall 102, denitration bed front side wall
301, denitration bed rear wall 302 is adopted to be fixed in welded or bolted way, and desulfurization bed 1, spray ammonia are mixed
Room 2, denitration bed 3 are connected as an entirety.
Circular hole 501 is offered in longitudinally connected plate 5, the number of circular hole 501 is identical with the number of ammonia branched pipe 402, ammonia point
Branch pipe 402 passes through from circular hole 501.
Beneficial effect：The desulfurization bed of the present invention is arranged in same tower body with denitration bed, compact-sized, is saved empty
Between, reduce equipment overall cost.Using by the way of the narrow cavity cross-flow of spray ammonia mixing chamber at a high speed spray ammonia, gas is made full use of to spray
To penetrate kinetic energy and realize that forced convertion mixes, mass-transfer efficiency is high, can realize ammonia being uniformly distributed in mezzanine space in a short time,
So as to improve denitration efficiency, while reduce secondary pollution of the escaping of ammonia to environment.On the premise of denitration efficiency is ensured, very
Reduce the thickness of denitration bed in big degree, so as to reduce overall pressure drop of the flue gas by purifying column, reduce equipment operation energy consumption.
Brief description of the drawings：
Fig. 1 is a kind of existing split type desulphurization denitration purification tower structure schematic diagram.
Fig. 2 is a kind of composite bed purification tower structure schematic diagram.
Fig. 3 is Fig. 2 main-vision surface detailed partial views.
Fig. 4 is that Fig. 2 A-A sprays the horizontal layout of ammonia system II into sectional view.
Fig. 5 is variation diagram of the denitration rate with the level interval of ammonia nozzle 403.
Fig. 6 is the longitudinally connected structural representation of plate 5.
Denitration bed ammonia concentration cloud charts of the present invention in the B-B direction sectional view that Fig. 7 is Fig. 4.
Prior art denitration bed ammonia concentration cloud charts in the B-B direction sectional view that Fig. 8 is Fig. 4.
01 desulfurizing tower, 02 denitrating tower；
I purifying column main body, II spray ammonia system
1 desulfurization bed, 2 spray ammonia mixing chambers, 3 denitration beds, 5 longitudinally connected plates
101- desulfurization bed front side walls, 102 desulfurization bed rear walls, 301 denitration bed front side walls, after 302 denitration beds
Side wall, 401 ammonia main pipelines, 402 ammonia branched pipes, 403 ammonia nozzles, the circular hole set on 501 longitudinally connected plates.
Embodiment：
The present invention is described in further detail with reference to the accompanying drawings and examples.
A kind of composite bed purifying column, including purifying column main body I and spray ammonia system II, the purifying column main body I is by air inlet
Side is sequentially provided with desulfurization bed 1, spray ammonia mixing chamber 2, denitration bed 3 to outlet side；Desulfurization bed 1 is connected with pending flue gas
Logical, spray ammonia mixing chamber 2 is connected with desulfurization bed 1, and denitration bed 3 is connected with spray ammonia mixing chamber 2, flue gas and denitration after processing
Bed 3 is connected；
The air inlet side of desulfurization bed 1 is provided with desulfurization bed front side wall 101, is provided between desulfurization bed 1 and spray ammonia mixing chamber 2
Denitration bed front side wall 301 is provided between desulfurization bed rear wall 102, spray ammonia mixing chamber 2 and denitration bed 3, denitration bed 3 goes out
Gas side is provided with denitration bed rear wall 302；
From desulfurization bed front side wall 101 to the longitudinally connected plate 5 being provided with denitration bed rear wall 302, longitudinally connect
Spacing between fishplate bar 5 is 2000mm~3000mm；
Spray ammonia system II includes 401,10~15 ammonia branched pipes 402 of ammonia main pipeline and 5~10 ammonia nozzles
403, ammonia main pipeline 401 is arranged in the outside of spray ammonia mixing chamber 2, and ammonia branched pipe 402 and ammonia nozzle 403 are arranged on spray ammonia
In the cavity of mixing chamber 2.
Desulfurization bed front side wall 101 is shutter or strip-type grille, and the desulfurization bed rear wall 102 is shutter, institute
It is shutter to state denitration bed front side wall 301, and the denitration bed rear wall 302 is shutter or gillis.
Pending flue gas first passes through desulfurization bed front side wall 101 and is introduced into desulfurization bed 1, then by desulfurization bed rear wall
102 enter spray ammonia mixing chamber 2, after the ammonia sprayed in the spray cavity of ammonia mixing chamber 2 with ammonia nozzle 403 is sufficiently mixed, then pass through
Cross denitration bed front side wall 301 and enter rear portion denitration bed 3, eventually pass through and discharged through denitration bed rear wall 302.
The ammonia that the ammonia nozzle 403 is sprayed up and down while is sprayed, and cross-flow is formed with flow of flue gas direction.
The ammonia nozzle 403 is evenly arranged in the horizontal direction, the level interval between two neighboring ammonia nozzle 403
For 400mm~1600mm.
The longitudinally connected plate 5 and desulfurization bed front side wall 101, desulfurization bed rear wall 102, denitration bed front side wall
301, denitration bed rear wall 302 is adopted to be fixed in welded or bolted way, and desulfurization bed 1, spray ammonia are mixed
Room 2, denitration bed 3 are connected as an entirety.
Circular hole 501 is offered in longitudinally connected plate 5, the number of circular hole 501 is identical with the number of ammonia branched pipe 402, ammonia point
Branch pipe 402 passes through from circular hole 501.
As shown in Fig. 2 pending flue gas enters desulfurization bed 1 by desulfurization bed front side wall 101 carries out first grade desulfurizing, flue gas
In most SO2It is removed.Entered by the flue gas of once desulfurization by the rear wall 102 of desulfurization bed 1 in spray ammonia mixing chamber 2,
Spraying in the cavity of ammonia mixing chamber 2, after the ammonia NH3 that flue gas sprays with ammonia nozzle 403 is sufficiently mixed, gaseous mixture is by de-
Nitre bed front side wall 301 enters denitration bed 3, further removes the nitrogen oxides NO in flue gasXWith remaining sulfur dioxide SO2, most
Discharged eventually by denitration bed rear wall 302.Regeneration activity Jiao of desulfurization bed 1 enters desulfurization bed 1 from its top, in gravity
Moved down under effect, forming cross-flow with the flue gas of bottom horizontal flow sheet contacts.After activated coke adsorption saturation, from the bottom of desulfurization bed 1
Portion discharges, and recycles after regeneration.Regeneration activity Jiao of denitration bed 3 enters desulfurization bed 3 from its top, in Action of Gravity Field
Under move down, forming cross-flow with the flue gas of bottom horizontal flow sheet contacts.After activated coke adsorption saturation, arranged from the bottom of denitration bed 3
Go out, recycle after regeneration.The respective independent control of the activated coke flow velocity of desulfurization bed 1 and denitration bed 3, mutually not by shadow
Ring.
As shown in figure 3, ammonia NH3Each horizontal ammonia branched pipe 402 is entered by ammonia main pipeline 401, then passes through ammonia
Nozzle 403 sprays at a high speed to upper and lower both direction simultaneously, is forced with multiply laterally across the flue gas of the spray cavity of ammonia mixing chamber 3
Convection current mixes, mass transfer enhancement efficiency.Flue gas enters the 301 of the preceding shutter of denitration bed from shutter 102 after desulfurization bed
During, the air-flow of flue gas narrows, and is more beneficial for reducing the scope of mass transfer area, improves the mixing efficiency with ammonia.
As shown in figure 4, ammonia NH3Each horizontal ammonia branched pipe 402 is entered by ammonia main pipeline 401, then passes through ammonia
Nozzle 403 sprays at a high speed to upper and lower both direction, and spraying caused recoil can mutually balance, after avoiding single way jet
Tube vibration problems caused by recoil is possible.
Ammonia nozzle 403 is evenly arranged in the horizontal direction, and the level interval between ammonia nozzle 403 is labeled as D.Flue gas
Denitration rate with level interval D between ammonia nozzle 403 change as shown in figure 5, therefrom it is observed that denitration rate first with
Level interval D increase and reduce, after to peaking, denitration rate reduces with level interval D increase again.Its mechanism exists
In, when the level interval D between ammonia nozzle 403 is too small, the increasing number of ammonia nozzle 403, before identical ammonia usage
Put, the speed that ammonia sprays from ammonia nozzle 403 reduces, without enough kinetic energy and nitrogen oxides in effluent NOXFilled
Divide mixing, denitration efficiency reduces.When the level interval D of ammonia nozzle 403 is too big, although the ammonia sprayed has enough kinetic energy and cigarette
Gas is sufficiently mixed, but because the quantity of ammonia nozzle 403 very little, causes overall mass-transfer efficiency inadequate, denitration rate reduces.Cause
This, level interval D between ammonia nozzle 403 there is an optimal value, level interval D span for 400~
1200mm。
It is as shown in Fig. 2 longitudinally connected from desulfurization bed front side wall 101 to being provided with denitration bed rear wall 302
Plate 5, the longitudinally connected plate 5 and desulfurization bed front side wall 101, desulfurization bed rear wall 102, denitration bed front side wall 301, take off
Sulphur bed rear wall 302 is adopted to be fixed in welded or bolted way, by desulfurization bed 1, spray ammonia mixing chamber 2, denitration
Room 3 is connected as an entirety, strengthens equipment global stiffness and bearing capacity.Spacing between the longitudinally connected plate 5 is
2000mm~3000mm.
As shown in fig. 6, circular hole 501 is offered in longitudinally connected plate 5, the number of circular hole 501 and the number phase of ammonia branched pipe 402
Together, ammonia branched pipe 402 passes through from circular hole 501, so as to realize the support for ammonia branched pipe 402.
The gas cleaning principle of composite bed purifying column is as follows：
1) flue gas to be clean enters desulfurization bed 1 by inlet plenum, from front to back through desulfurization bed 1, in this process,
Most sulfur dioxide SO2By activated coke Adsorption, while using the absorption and filtration of activated coke, while remove mercury
And dust.
2) flue gas by the processing of first desulfurizing and purifying is flowed out by desulfurization bed 1, into spray ammonia mixing chamber 2, in spray ammonia
In the cavity of mixing chamber 2, multiple ammonia nozzles 403, ammonia NH are provided with3Spray from the high speed of ammonia nozzle 403, sprayed with passing through
The flue gas of ammonia mixing chamber carries out forced convertion mixing, and after being well mixed, gaseous mixture enters denitration bed 3, in denitration bed 3,
Nitrogen oxides NOXWith ammonia NH3Generation selective catalytic reduction reaction, generate harmless nitrogen N2With water H2O, so as to remove cigarette
Nitrogen oxides NO in gasX, remaining sulfur dioxide SO in flue gas2Can also further it be removed in denitration bed.
3) regeneration activity Jiao of desulfurization bed 1 enters desulfurization bed 1 from its top, moves down under gravity, with
The flue gas of bottom horizontal flow sheet forms cross-flow contact.After activated coke adsorption saturation, discharge from the bottom of desulfurization bed 1, follow after regeneration
Ring uses.Regeneration activity Jiao of denitration bed 3 enters desulfurization bed 3 from its top, moves down under gravity, with water
The dynamic flue gas of advection forms cross-flow contact.After activated coke adsorption saturation, discharge from the bottom of denitration bed 3, circulate after regeneration
Use.
Embodiment 1：
Embodiment 1 is composite bed purifying column used in steel industry sintering machine, including purifying column main body I and spray ammonia system
System II, it is characterised in that：The purifying column main body I by air inlet side to outlet side be sequentially provided with desulfurization bed 1, spray ammonia mixing chamber 2,
Denitration bed 3.The desulfurization bed 1 is connected with pending flue gas, and spray ammonia mixing chamber 2 is connected with desulfurization bed 1, denitration bed
Layer 3 is connected with spray ammonia mixing chamber 2, and flue gas is connected with denitration bed 3 after processing.
The air inlet side of desulfurization bed 1 is provided with desulfurization bed front side wall 101, is set between desulfurization bed 1 and spray ammonia mixing chamber 2
Have and be provided with denitration bed front side wall 301, the outlet of denitration bed 3 between desulfurization bed rear wall 102, spray ammonia mixing chamber 2 and denitration bed 3
Side is provided with denitration bed rear wall 302.
From desulfurization bed front side wall 101 to the longitudinally connected plate 5 being provided with denitration bed rear wall 302, longitudinally connected plate 5
Between spacing be 2500mm.
Spray ammonia system (II) includes 401,10 ammonia branched pipes 402 of ammonia main pipeline, cloth on each ammonia branched pipe 402
It is equipped with 6 ammonia nozzles 403.The ammonia main pipeline 401 is arranged in the outside of spray ammonia mixing chamber 2, the ammonia branched pipe
402 and ammonia nozzle 403 be arranged in the cavity of spray ammonia mixing chamber 2.
The desulfurization bed front side wall 101 is shutter, and the desulfurization bed rear wall 102 is shutter, the denitration
Bed front side wall 301 is shutter, and the denitration bed rear wall 302 is gillis.
Pending flue gas enters desulfurization bed 1 by desulfurization bed front side wall 101 and carries out first grade desulfurizing, most of in flue gas
SO2It is removed.Entered by the flue gas of once desulfurization by the rear wall 102 of desulfurization bed 1 in spray ammonia mixing chamber 2, mixed in spray ammonia
Close in the cavity of room 2, after the ammonia NH3 that flue gas sprays with ammonia nozzle 403 is sufficiently mixed, before gaseous mixture passes through denitration bed
Side wall 301 enters denitration bed 3, further removes the nitrogen oxides NO in flue gasXWith remaining sulfur dioxide SO2, eventually through
Denitration bed rear wall 302 is discharged.Regeneration activity Jiao of desulfurization bed 1 from its top enter desulfurization bed 1, under gravity to
Lower movement, form cross-flow with the flue gas of bottom horizontal flow sheet and contact.After activated coke adsorption saturation, discharged from the bottom of desulfurization bed 1, warp
Posterior circle is regenerated to use.Regeneration activity Jiao of denitration bed 3 enters desulfurization bed 3 from its top, under gravity to moving down
It is dynamic, form cross-flow with the flue gas of bottom horizontal flow sheet and contact.After activated coke adsorption saturation, discharged from the bottom of denitration bed 3, through regeneration
Posterior circle uses.The respective independent control of the activated coke flow velocity of desulfurization bed 1 and denitration bed 3, it is mutually unaffected.
The ammonia that the ammonia nozzle 403 is sprayed up and down while is sprayed, and cross-flow is formed with flow of flue gas direction.
The ammonia nozzle 403 is evenly arranged in the horizontal direction, the level interval between two neighboring ammonia nozzle 403
For 500mm.
The longitudinally connected plate 5 and desulfurization bed front side wall 101, desulfurization bed rear wall 102, denitration bed front side wall
301, denitration bed rear wall 302 is fixed using welding manner, and desulfurization bed 1, spray ammonia mixing chamber 2, denitration chamber 3 are connected
For an entirety.
Circular hole 501 is offered in longitudinally connected plate 5, the number of circular hole 501 is identical with the number of ammonia branched pipe 402, ammonia point
Branch pipe 402 passes through from circular hole 501.
The design treatment quantity of the present embodiment is 15 × 104Nm3/ h, 150 DEG C of flue-gas temperature, sulfur dioxide SO2Content is
1350mg/Nm3, nitrogen oxides amount of NOx is 350mg/Nm3, desulfurization bed activated coke loadings are 200m3, the work of denitration bed
Property Jiao's loadings are 240m3。
After interlayer forced convertion mixing, the ammonia concentration of the cross section of denitration bed 3 is distributed as shown in fig. 7, therefrom ammonia
It is observed that ammonia mass transfer effect is good, distribution is wider, and concentration distribution also more uniformly, can participate in the de- of reaction
The volume of nitre bed layer is 188m3, denitration bed utilization ratio is 79%, and good mass transfer condition also ensure that good reaction effect
Fruit.Flue gas desulfuration efficiency after purifying column reaches 93%, and denitration efficiency reaches 69%, and it is up to standard to realize fume emission.
And by the way of prior art (CN102824810A, CA1193929A1), cancel the cavity of spray ammonia mixing chamber 2,
Ammonia nozzle 403 directly sprays ammonia and flue gas hybrid reaction to layer of charcoal, and on the premise of identical ammonia flow, its denitration bed is transversal
The ammonia concentration distribution in face is as shown in figure 8, because lacked the process of the forced convertion mass transfer of mixing chamber gas-phase space, and ammonia is only
Mass transfer can be carried out in activated coke bed by natural diffuseness, therefore, as can be observed from Figure, ammonia be distributed only over it is several very
In narrow belt strip, concentration distribution is very uneven, and the volume that can participate in the denitration bed of reaction is 57m3, denitration bed profit
It is 24% with rate, denitration rate is 19%.Mass transfer effect is bad not only to reduce reaction efficiency, and the ammonia being not sufficiently reacted
Air is directly discharged after denitration bed can be passed through, causes secondary pollution.
Embodiment 2：
Embodiment 2 is composite bed purifying column used in steel industry sintering machine, including purifying column main body I and spray ammonia system
System II, it is characterised in that：The purifying column main body I by air inlet side to outlet side be sequentially provided with desulfurization bed 1, spray ammonia mixing chamber 2,
Denitration bed 3.The desulfurization bed 1 is connected with pending flue gas, and spray ammonia mixing chamber 2 is connected with desulfurization bed 1, denitration bed
Layer 3 is connected with spray ammonia mixing chamber 2, and flue gas is connected with denitration bed 3 after processing.
The air inlet side of desulfurization bed 1 is provided with desulfurization bed front side wall 101, is set between desulfurization bed 1 and spray ammonia mixing chamber 2
Have and be provided with denitration bed front side wall 301, denitration bed 3 between desulfurization bed rear wall 102, spray ammonia mixing chamber 2 and denitration bed 3
Outlet side is provided with denitration bed rear wall 302.
From desulfurization bed front side wall 101 to the longitudinally connected plate 5 being provided with denitration bed rear wall 302, longitudinally connect
Spacing between fishplate bar 5 is 2000mm.
Spray ammonia system (II) includes 401,15 ammonia branched pipes 402 of ammonia main pipeline, cloth on each ammonia branched pipe 402
It is equipped with 10 ammonia nozzles 403.The ammonia main pipeline 401 is arranged in the outside of spray ammonia mixing chamber 2, the ammonia branched pipe
402 and ammonia nozzle 403 be arranged in the cavity of spray ammonia mixing chamber 2.
The desulfurization bed front side wall 101 is strip-type grille, and the desulfurization bed rear wall 102 is shutter, described de-
Nitre bed layer front side wall 301 is shutter, and the denitration bed rear wall 302 is shutter.
Pending flue gas enters desulfurization bed 1 by desulfurization bed front side wall 101 and carries out first grade desulfurizing, most of in flue gas
SO2It is removed.Entered by the flue gas of once desulfurization by desulfurization bed rear wall 102 in spray ammonia mixing chamber 2, mixed in spray ammonia
Close in the cavity of room 2, after the ammonia NH3 that flue gas sprays with ammonia nozzle 403 is sufficiently mixed, gaseous mixture passes through denitration bed
Front side wall 301 enters denitration bed 3, further removes the nitrogen oxides NO in flue gasXWith remaining sulfur dioxide SO2, it is final logical
Denitration bed rear wall 302 is crossed to discharge.Regeneration activity Jiao of desulfurization bed 1 enters desulfurization bed 1 from its top, in Action of Gravity Field
Under move down, forming cross-flow with the flue gas of bottom horizontal flow sheet contacts.After activated coke adsorption saturation, arranged from the bottom of desulfurization bed 1
Go out, recycle after regeneration.Regeneration activity Jiao of denitration bed 3 from its top enter desulfurization bed 3, under gravity to
Lower movement, form cross-flow with the flue gas of bottom horizontal flow sheet and contact.After activated coke adsorption saturation, discharged from the bottom of denitration bed 3, warp
Posterior circle is regenerated to use.The respective independent control of the activated coke flow velocity of desulfurization bed 1 and denitration bed 3, it is mutually unaffected.
The ammonia that the ammonia nozzle 403 is sprayed up and down while is sprayed, and cross-flow is formed with flow of flue gas direction.
The ammonia nozzle 403 is evenly arranged in the horizontal direction, the level interval between two neighboring ammonia nozzle 403
For 400mm.
The longitudinally connected plate 5 and desulfurization bed front side wall 101, desulfurization bed rear wall 102, denitration bed front side wall
301, denitration bed rear wall 302 is fixed using welding manner, and desulfurization bed 1, spray ammonia mixing chamber 2, denitration chamber 3 are connected
It is connected in an entirety.
Circular hole 501 is offered in longitudinally connected plate 5, the number of circular hole 501 is identical with the number of ammonia branched pipe 402, ammonia point
Branch pipe 402 passes through from circular hole 501.
The design treatment quantity of the present embodiment is 28 × 104Nm3/ h, 150 DEG C of flue-gas temperature, sulfur dioxide SO2Content is
1500mg/Nm3, nitrogen oxides NOXContent is 400mg/Nm3.Desulfurization bed activated coke loadings are 400m3, denitration bed activity
Burnt loadings are 520m3.As a result show, be removed 90% by first bed sulfur dioxide, then pass through denitration bed, flue gas
Desulfuration efficiency reaches 95% after denitration bed, and denitration efficiency reaches 65%, and it is up to standard to realize fume emission.
Claims (7)
1. a kind of composite bed purifying column, including purifying column main body (I) and spray ammonia system (II), it is characterised in that：Purifying column master
Body (I) is sequentially provided with desulfurization bed (1), spray ammonia mixing chamber (2), denitration bed (3) from left to right；
Desulfurization bed (1) is connected with pending flue gas, and spray ammonia mixing chamber (2) is connected with desulfurization bed (1), denitration bed
(3) it is connected with spray ammonia mixing chamber (2), flue gas is connected with denitration bed (3) after processing；
Desulfurization bed (1) air inlet side is provided with desulfurization bed front side wall (101), is set between desulfurization bed (1) and spray ammonia mixing chamber (2)
Have and be provided with denitration bed front side wall (301) between desulfurization bed rear wall (102), spray ammonia mixing chamber (2) and denitration bed (3),
Denitration bed (3) outlet side is provided with denitration bed rear wall (302)；
From desulfurization bed front side wall (101) to the longitudinally connected plate (5) being provided with denitration bed rear wall (302), longitudinal direction
Spacing between connecting plate (5) is 2000mm~3000mm；
Spray ammonia system II includes 401,10~15 ammonia branched pipes 402 of ammonia main pipeline and 5~10 ammonia nozzles (403),
Ammonia main pipeline (401) is arranged in the outside of spray ammonia mixing chamber (2), and ammonia branched pipe (402) and ammonia nozzle (403) are arranged on
In the cavity for spraying ammonia mixing chamber (2).
2. according to the composite bed purifying column described in claim 1, it is characterised in that：The desulfurization bed front side wall (101) is
Shutter or strip-type grille, the desulfurization bed rear wall (102) are shutter, and the denitration bed front side wall (301) is hundred
Leaf window, the denitration bed rear wall (302) are shutter or gillis.
3. according to the composite bed purifying column described in claim 1, it is characterised in that：Before pending flue gas first passes through desulfurization bed
Side wall (101) is introduced into desulfurization bed (1), then enters spray ammonia mixing chamber (2) by desulfurization bed rear wall (102), in spray ammonia
After being sufficiently mixed in mixing chamber (2) cavity with the ammonia of ammonia nozzle (403) injection, then by denitration bed front side wall (301)
Into rear portion denitration bed (3), eventually pass through and discharged through denitration bed rear wall (302).
4. according to the composite bed purifying column described in claim 1, it is characterised in that：What the ammonia nozzle (403) was sprayed
Ammonia is sprayed simultaneously up and down, and cross-flow is formed with flow of flue gas direction.
5. according to the composite bed purifying column described in claim 1, it is characterised in that：The ammonia nozzle (403) is in level side
It is evenly arranged upwards, the level interval between two neighboring ammonia nozzle (403) is 400mm~1600mm.
6. according to the composite bed purifying column described in claim 1, it is characterised in that：The longitudinally connected plate (5) and desulfurization bed
Layer front side wall (101), desulfurization bed rear wall (102), denitration bed front side wall (301), denitration bed rear wall (302) are adopted
With welding or bolt connecting mode fix, by desulfurization bed (1), spray ammonia mixing chamber (2), denitration bed (3) be connected as one it is whole
Body.
7. according to the composite bed purifying column described in claim 1, it is characterised in that：Circular hole is offered in longitudinally connected plate (5)
(501), circular hole (501) number is identical with ammonia branched pipe (402) number, and ammonia branched pipe (402) is worn from circular hole (501)
Cross.
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| CN201710887631.3A CN107469600A (en) | 2017-09-27 | 2017-09-27 | A kind of composite bed purifying column |
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| CN108722185A (en) * | 2018-07-27 | 2018-11-02 | 国电环境保护研究院有限公司 | A kind of spray ammonia method and spray ammonia system for charcoal base catalytic desulfurizing denitrating system |
| CN110743339A (en) * | 2019-11-11 | 2020-02-04 | 中国科学院山西煤炭化学研究所 | Flue gas pollutant purification device and method |
| CN111545026A (en) * | 2020-05-12 | 2020-08-18 | 江苏峰峰鸿运环保科技发展有限公司 | Low-temperature efficient desulfurization and denitrification device and method for flue gas |
| CN111871173A (en) * | 2020-07-03 | 2020-11-03 | 河北唯沃环境工程科技有限公司 | Desulfurization and denitrification integrated treatment device |
| CN115055054A (en) * | 2022-07-20 | 2022-09-16 | 中冶北方（大连）工程技术有限公司 | Low-resistance active coke flue gas purification device and process method |
| CN115253667A (en) * | 2022-07-20 | 2022-11-01 | 中冶北方（大连）工程技术有限公司 | Two-stage double-bed cross-flow type active coke desulfurization and denitrification device and process method |
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| CN115253667A (en) * | 2022-07-20 | 2022-11-01 | 中冶北方（大连）工程技术有限公司 | Two-stage double-bed cross-flow type active coke desulfurization and denitrification device and process method |
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