CN109954404A - SCR denitration system - Google Patents
SCR denitration system Download PDFInfo
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- CN109954404A CN109954404A CN201910335813.9A CN201910335813A CN109954404A CN 109954404 A CN109954404 A CN 109954404A CN 201910335813 A CN201910335813 A CN 201910335813A CN 109954404 A CN109954404 A CN 109954404A
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- filter bag
- flue gas
- scr denitration
- carding
- layer
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- 239000003546 flue gas Substances 0.000 claims abstract description 83
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 80
- 239000003054 catalyst Substances 0.000 claims abstract description 50
- 238000009960 carding Methods 0.000 claims abstract description 41
- 239000007789 gas Substances 0.000 claims abstract description 26
- 238000002347 injection Methods 0.000 claims description 18
- 239000007924 injection Substances 0.000 claims description 18
- 239000000428 dust Substances 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 33
- 229910021529 ammonia Inorganic materials 0.000 abstract description 14
- 239000010410 layer Substances 0.000 description 52
- 230000000694 effects Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000005507 spraying Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 239000000908 ammonium hydroxide Substances 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Classifications
-
- 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
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
-
- 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
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/04—Cleaning filters
-
- 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
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
-
- 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
- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
- B01D46/70—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter
- B01D46/72—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter with backwash arms, shoes or nozzles
-
- 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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
-
- 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
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a kind of SCR denitration systems, and including the tower body with gas inlet and exhanst gas outlet, the tower body is equipped with airflow-distribution board at the gas inlet, are equipped with catalyst layer in the tower body；It further include flue gas carding, the flue gas carding is between the airflow-distribution board and the catalyst layer；The flue gas carding includes the filter bag layer that multiple filter bags are formed, so that flue gas flows to the catalyst layer after flowing through the filter bag layer.The SCR denitration system is equipped with flue gas carding on flow of flue gas path, and the structure setting of the flue gas carding can make being more evenly distributed for ash-laden gas, reduces air flow rate deviation, to reduce the escaping of ammonia rate, improves denitration efficiency.
Description
Technical field
The present invention relates to purifying coal-fired flue gas technical fields, more particularly to a kind of SCR denitration system.
Background technique
China is main coal production and country of consumption in the world, and environment caused by the power generation based on fire coal is dirty
Dye is a restraining factors of China's electric power development industry, is had according to nitrogen oxide emission of the relevant criterion to fired power generating unit etc.
Strict requirements.
At this stage, the flue-gas denitration process of practical implementation mainly includes SCR (selective catalytic reduction) denitration technology,
SCR denitration technology refers in the condition for having catalyst, in suitable smoke temperature range (usually 300~420 DEG C), denitration reduction
Agent (there are commonly liquefied ammonia, ammonium hydroxide and urea etc.) selectively with the NO in flue gasxReaction generates nitrogen and water, thus de-
Except the NO in flue gasx, the technology because operation convenience, high reliablity, high no coupling product and denitration efficiency the advantages that be widely used.
In SCR denitration technology, catalyst and flow field are two key factors for influencing denitration performance, if Flow Field Distribution
It is undesirable to will cause that ammonia nitrogen mixing is uneven, dust deposit in flue is serious and flue gas is uneven by the speed of catalyst, so as to cause
The problems such as denitration efficiency is low, catalyst life reduces, the escaping of ammonia is serious.
In view of this, how to improve Flow Field Distribution, ash-laden gas distributing homogeneity is improved, is that those skilled in the art are current
The technical issues that need to address.
Summary of the invention
The object of the present invention is to provide a kind of SCR denitration system, which is equipped with cigarette on flow of flue gas path
Gas carding, the structure setting of the flue gas carding can make being more evenly distributed for ash-laden gas, reduce air flow rate deviation, from
And the escaping of ammonia rate is reduced, improve denitration efficiency.
In order to solve the above technical problems, the present invention provides a kind of SCR denitration system, including go out with gas inlet and flue gas
The tower body of mouth, the tower body are equipped with airflow-distribution board at the gas inlet, are equipped with catalyst layer in the tower body；Also wrap
Flue gas carding is included, the flue gas carding is between the airflow-distribution board and the catalyst layer；The flue gas combing
Device includes the filter bag layer that multiple filter bags are formed, so that flue gas flows to the catalyst layer after flowing through the filter bag layer.
The SCR denitration system, is equipped with flue gas carding in smoke flow channels, and flue gas carding is located at airflow-distribution board
Between catalyst layer, wherein flue gas carding includes the filter bag layer that multiple filter bags are formed；After being arranged in this way, in SCR denitration system
In system, flue gas is after airflow-distribution board, it is also necessary to and catalyst layer can be just flowed through after flue gas carding to be chemically reacted,
The surface area ratio airflow-distribution board of filter bag is big, and hole is relatively small, passes through filter bag by the flue gas stream of airflow-distribution board
After layer, air flow method is more uniform, after the combing of filter bag layer, can reduce flow deviation, be conducive to filling for flue gas and catalyst
Tap touching improves denitration efficiency so as to reduce the escaping of ammonia rate.
SCR denitration system as described above, the airflow-distribution board are located at the top of the catalyst layer；The filter bag
Bag is bottom-up, and sack portion is downward.
SCR denitration system as described above, the filter bag are metal filter bag made of metal web.
SCR denitration system as described above, the hole of the metal filter bag are greater than the dust size in flue gas.
SCR denitration system as described above, multiple filter bags are arranged at ranks form.
SCR denitration system as described above, further include it is multiple embark on journey or arranged in column rod rest, each rod rest
It is connected with multiple filter bags；The bag bottom of the filter bag is fixed by the connecting rod in the rod rest；It further include card, it is described
Card is with the through-hole is fixed in the identical and corresponding through-hole section in position, the sack portion of the filter bag with the filter bag number
Portion.
SCR denitration system as described above further includes deashing device, and the deashing device is located under the filter bag layer
Side, the deashing device are used to carry out deashing processing to each filter bag.
SCR denitration system as described above, the deashing device include more injection pipelines, and the injection pipeline has more
The bag mouth position of a injection hole, multiple injection holes and multiple filter bags corresponds；The injection pipeline passes through arteries and veins
Valve is rushed to connect with compressed gas packet.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of specific embodiment of SCR denitration system provided by the present invention；
Fig. 2 is the partial enlarged view in Fig. 1 at flue gas carding place；
Fig. 3 is the partial enlarged view at the position A in Fig. 2；
Fig. 4 is the structural schematic diagram of the card of SCR denitration system in specific embodiment；
Fig. 5 is the structural schematic diagram of card and rod rest in SCR denitration system in specific embodiment；
Fig. 6 a and Fig. 6 b respectively illustrate the dust layout drawing of not set flue gas carding and after the combings of flue gas carding
Dust layout drawing；
Fig. 7 a and Fig. 7 b are respectively the flue speed cloud atlas of not set flue gas carding and are located at after flue gas carding is arranged
Flue speed cloud atlas downstream.
Description of symbols:
Tower body 110, admission line 120, outlet pipe 130, airflow-distribution board 140, catalyst layer 150, ammonia-gas spraying device
160；
Filter bag layer 210, filter bag 211, rod rest 220, connecting rod 230, card 240, through-hole section 241, deashing device 250,
Injection pipeline 251.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.
Fig. 1 to Fig. 3 is please referred to, Fig. 1 is a kind of structural representation of specific embodiment of SCR denitration system provided by the present invention
Figure；Fig. 2 is the partial enlarged view in Fig. 1 at flue gas carding place；Fig. 3 is the partial enlarged view at the position A in Fig. 2.
In the embodiment, SCR denitration system includes tower body 110, and tower body 110 has gas inlet and exhanst gas outlet, specifically
Ground, the gas inlet of tower body 110 are connected with admission line 120, and exhanst gas outlet is connected with outlet pipe 130.In admission line 120
Flow-guiding structure etc. can be set to be oriented to the flue gas of entrance, to facilitate flow of flue gas.
In the embodiment, ammonia-gas spraying device 160 is equipped in admission line 120, ammonia-gas spraying device 160 is for spraying denitration reduction
Agent, denitrification reducing agent are usually liquid nitrogen, ammonium hydroxide or urea, can specifically be selected according to actual needs.Flue gas passes through ammonia-gas spraying device 160
When position, after mixing with the denitrification reducing agent that ammonia-gas spraying device 160 sprays, tower body 110 is flowed to together；It is close in tower body 110
It is equipped with airflow-distribution board 140 at its gas inlet, catalyst layer 150 is additionally provided in tower body 110, mixed flue gas passes through air flow method
After plate is uniformly distributed, catalyst layer 150 is flowed to, when flowing through catalyst layer 150, under the effect of the catalyst, denitrification reducing agent and flue gas
In NOxIt chemically reacts, ammonia and water is generated, to remove the NO in flue gasx。
It is found after studying, in the case where catalyst performance is certain, ammonia in flue gas nitrogen mixed effect directly affects catalysis
The transformation efficiency of agent, when requiring denitration efficiency to reach 90% or more, the requirement to ammonia nitrogen mixed effect is stringenter；Meanwhile
The escaping of ammonia is also related to ammonia nitrogen mixed effect, in the case where catalyst performance is certain, when concentration deviation factor is less than 4%,
Because the escaping of ammonia can be ignored caused by uneven concentration, but as concentration deviation factor increases, the escaping of ammonia is just more obvious, when
When concentration deviation factor is more than 10%, the escaping of ammonia will be more than the 3ppm upper limit of national regulation；As it can be seen that ammonia density distribution and flue gas
Distribution it is extremely important for the control of denitration efficiency and the escaping of ammonia, that is to say, that in SCR denitration system, Flow Field Distribution
Uniformity directly affects denitration efficiency.
If Flow Field Distribution is uneven, flue gas stream will be uneven by the speed of catalyst layer 150, and passes through catalyst
The speed of layer 150 is unevenly easy to cause 150 regional area flow velocity of catalyst layer is too low, flow velocity is excessively high or flow velocity drift angle is excessive etc.
Problem, wherein the too low meeting accelerator activator blocking of flow velocity, flow velocity is excessively high or flow velocity drift angle is excessive, can aggravate catalyst abrasion,
And to aggravate VELOCITY DISTRIBUTION in turn uneven for catalyst blockage and catalyst abrasion, vicious circle is formed, thereby it is ensured that cigarette
The distributing homogeneity of gas air-flow is most important.
It is analyzed based on the studies above, which is made that improvement to SCR denitration system, as shown in Figure 1, the embodiment mentions
The SCR denitration system of confession has additional flue gas carding, and specifically, flue gas carding is located at airflow-distribution board 140 and catalyst layer
Between 150, that is to say, that flue gas is after airflow-distribution board 140 is uniformly distributed, it is also necessary to which carrying out combing by flue gas carding could flow
To catalyst layer 150.
Wherein, flue gas carding includes the filter bag layer 210 that multiple filter bags 211 are formed so that flue gas flow through filter bag layer 210 it
Flow to catalyst layer 150 again afterwards.
Herein it should be noted that the filter bag 211 of filter bag layer 210 is equipped with multiple and basic on the cross section of tower body 110
It is covered with, it can be understood as, filter bag layer 210 is separated by the runner between air flow method 140 and catalyst layer 150, also needs to manage
Solution when multiple filter bags 211 are arranged, certainly exists gap, but passes through airflow-distribution board between two neighboring filter bag 211
140 flue gas all passes through filter bag 211, the through-hole section 241 of card 240 flows to catalyst layer 150.
As above after setting, in SCR denitration system, flue gas is after airflow-distribution board 140 is uniformly distributed, it is also necessary to pass through flue gas
After carding is further evenly distributed with, it can just flow through catalyst layer 150 and be chemically reacted；That is, flue gas has carried out twice
Cloth adjustment, compared to airflow-distribution board 140, the surface area of filter bag 211 is larger, and hole is smaller, by airflow-distribution board 140
After flue gas stream is using filter bag layer 210, air flow method can be more uniform, after the combing of filter bag layer 210, can reduce flow
Deviation is conducive to coming into full contact with for flue gas and catalyst, can reduce the escaping of ammonia rate, and improve denitration efficiency.
As shown in Figure 1, the gas inlet of tower body 110 is particularly located at the upper end in the embodiment, exhanst gas outlet is located under it
End, that is to say, that flue gas is to flow in tower body 110 from up to down, in this way, airflow-distribution board 140 is installed on 110 upper end of tower body
At gas inlet, catalyst layer 150 is set to inside tower body 110, positioned at the lower section of airflow-distribution board 140.
In practical application, multilayer is can be set in catalyst layer 150, is intervally arranged along flow of flue gas direction；Side shown in Fig. 1
In case, catalyst layer 150 is specifically equipped with three layers, it will be understood that and as needed, the number of catalyst layer 150 can also be set as other,
Spacing distance between two neighboring catalyst layer 150 can also be arranged as the case may be.
Obviously, catalyst layer 150 be equipped with multilayer on the basis of, filter bag layer 210 be located at airflow-distribution board 140 and its near
Between close catalyst layer 150.
In the embodiment, airflow-distribution board 140, which is located above catalyst layer 150, to be arranged, that is, flue gas is in tower body 110
When flowing from up to down, the bag of each filter bag 211 of filter bag layer 210 is bottom-up, and sack portion is arranged downward, that is to say, that filter bag
211 projecting settings.
So set, the flowing for flue gas of being more convenient for, while also facilitating and deashing operation is carried out to filter bag 211.
In specific scheme, filter bag 211 is metal filter bag made of metal web, and specifically, metal web should
The hot environment being able to bear in SCR denitration system, usually 300~450 DEG C, in case filter bag 211 is damaged.
In specific scheme, the hole of metal filter bag is greater than the dust size setting in flue gas, in order to which dust passes through gold
Belong to filter bag, prevents a large amount of dust stratifications in metal filter bag surface layer.The pore size of metal filter bag can specifically be set according to practical application operating condition.
In specific scheme, each filter bag 211 of filter bag layer 210 embarks on journey form arrangement in column so that it is convenient to each filter bag 211
Installation, more specifically, filter bag is arranged in 210 each filter bag 211 in the matrix form of rule state, between adjacent two filter bag 211
Spacing distance it is all identical, to carry out uniformly distributed processing to air-flow well.
It is appreciated that 211 arrangement form of filter bag of actual setting filter bag layer 210 also can according to need and be adjusted, than
If cross section of fluid channel is rounded, each filter bag 211 can also arrange in multiple concentric circles.
Specifically, flue gas carding further include it is multiple embark on journey or arranged in column rod rest 220, on each rod rest 220
Multiple filter bags 211 are connected, in this way, multiple filter bags 211 on each rod rest 220 just form the arranged in column matrix form of row；Such as
Shown in Fig. 3, specifically, the bag bottom of each filter bag 211 is fixedly connected by connecting rod 230 with rod rest 220, wherein connection
It can be detachably fixed connection by fasteners such as bolts between bar 230 and rod rest 220, in order to replace filter bag 211 or root
According to needing to adjust.
The lower section of filter bag layer 210 is additionally provided with card 240, has that identical and position is corresponding with 211 number of filter bag on card 240
Through-hole section 241, the sack portion of filter bag 211 is fixed on through-hole section 241, that is to say, that the through-hole section 241 and filter bag of card 240
211 correspond.
It is the structural schematic diagram of the card of SCR denitration system in specific embodiment please also refer to Fig. 4 and Fig. 5, Fig. 4；Fig. 5
For the structural schematic diagram of card and rod rest in SCR denitration system in specific embodiment.
As shown in Figure 4 and Figure 5, the filter bag 211 of the spread pattern of the through-hole section 241 of card 240 and filter bag layer 210 arranges shape
Formula is identical, and in illustrated scheme, the cross section of tower body 110 is square structure, that is to say, that and the section of flue gas flow channel is square structure,
On this basis, each filter bag 211 of filter bag layer 210 is embarked on journey arranges in column, and the position of the filter bag 211 of adjacent rows corresponds,
The position of the filter bag 211 of adjacent two column corresponds；It is appreciated that the filter bag 211 of adjacent rows or two column is wrong when actual setting
Position arrangement is also feasible.
When actual setting, the arrangement form of rod rest 220 can be as shown in Figure 5.
In the embodiment, the lower section of filter bag layer 210 is additionally provided with deashing device 250, and deashing device 250 is used for filter bag layer
210 each filter bag 211 carries out deashing processing.
In specific scheme, pulse jetting deashing form is can be selected in deashing device 250, and deashing device includes more injection tubes
Road 251, every injection pipeline 251 have multiple injection holes, multiple injection holes of more injection pipelines 251 and multiple filter bags 211
Bag mouth position correspond, that is to say, that the number of injection hole is identical with filter bag 211, and arrangement and filter bag 211 also phase
Together.Every injection pipeline 251 is connect by pulse valve with compressed gas packet.
When needing deashing, pulse valve is opened, deashing air-flow rises the pressure in filter bag 211 rapidly, at this point, filter bag 211
It can expand outward rapidly, when bag wall is expanded into extreme position, tension makes it by strong impact vibration, and obtains maximum anti-
To acceleration to start inwardly to receive, and the dust layer on 211 surface of filter bag is attached to not by tension force effect, thus in inertia force
It falls off from filter bag 211 under effect, to realize 211 deashing of filter bag.
The dust layout drawing of not set flue gas carding is respectively illustrated please also refer to Fig. 6 a and Fig. 6 b, Fig. 6 a and Fig. 6 b
With the dust layout drawing after the combing of flue gas carding.
Intuitively to show the flue gas carding to the carding effect of flue gas stream, after not set and setting flue gas carding
The state of air-flow has carried out experiment and has compared.
According to the comparison of Fig. 6 a and Fig. 6 b as it can be seen that when not set flue gas carding, in cross section of fluid channel, the dust of flue gas stream
It is distributed and uneven, airflow homogeneity is poor, and after flue gas carding is arranged, flue gas is after the combing of flue gas carding, flue gas gas
The Dust distribution of stream is uniform, and airflow homogeneity is obviously improved.
Meanwhile emulation also is simulated to the air-flow in not set and setting flue gas carding SCR denitration system, it is right
Air-flow velocity has carried out comparative analysis；It is respectively not set flue gas carding please also refer to Fig. 7 a and Fig. 7 b, Fig. 7 a and Fig. 7 b
Flue speed cloud atlas and setting flue gas carding after the flue speed cloud atlas that located downstream.
Comparison diagram 7a and Fig. 7 b are as it can be seen that when not set flue gas carding, gas flow rate and uneven, middle part flow velocity in flue
Lower, the flow velocity close to flue peripheral wall is higher, and after flue gas carding is set, the air-flow velocity by flue gas carding is uniform,
In this way, can come into full contact with and react with catalyst when flowing through catalyst layer 150, while improving denitration efficiency, can be avoided
Catalyst blockage or abrasion are caused, the service life of catalyst is able to extend.
SCR denitration system provided by the present invention is described in detail above.Specific case pair used herein
The principle of the present invention and embodiment are expounded, method of the invention that the above embodiments are only used to help understand
And its core concept.It should be pointed out that for those skilled in the art, before not departing from the principle of the invention
It puts, can be with several improvements and modifications are made to the present invention, these improvement and modification also fall into the guarantor of the claims in the present invention
It protects in range.
Claims (8)
1.SCR denitrating system, including the tower body with gas inlet and exhanst gas outlet, the tower body is at the gas inlet
Equipped with airflow-distribution board, catalyst layer is equipped in the tower body；It is characterized in that, further include flue gas carding, the flue gas comb
Device is managed between the airflow-distribution board and the catalyst layer；The flue gas carding includes the filter bag that multiple filter bags are formed
Layer, so that flue gas flows to the catalyst layer after flowing through the filter bag layer.
2. SCR denitration system according to claim 1, which is characterized in that the airflow-distribution board is located at the catalyst
The top of layer；The bag of the filter bag is bottom-up, and sack portion is downward.
3. SCR denitration system according to claim 2, which is characterized in that the filter bag is gold made of metal web
Belong to filter bag.
4. SCR denitration system according to claim 3, which is characterized in that the hole of the metal filter bag is greater than in flue gas
Dust size.
5. SCR denitration system according to claim 2, which is characterized in that multiple filter bags are arranged at ranks form.
6. SCR denitration system according to claim 5, which is characterized in that further include multiple embark on journey or arranged in column branch
Bridge, each rod rest are connected with multiple filter bags；The bag bottom of the filter bag is fixed by the connecting rod in the branch
Bridge；It further include card, the card has with the filter bag number the identical and corresponding through-hole section in position, the bag of the filter bag
Oral area is fixed on the through-hole section.
7. according to the described in any item SCR denitration systems of claim 2-6, which is characterized in that it further include deashing device, it is described clear
Apparatus for ash is located at the lower section of the filter bag layer, and the deashing device is used to carry out deashing processing to each filter bag.
8. SCR denitration system according to claim 7, which is characterized in that the deashing device includes more injection pipelines,
The injection pipeline has multiple injection holes, the bag mouth position one-to-one correspondence of multiple injection holes and multiple filter bags；
The injection pipeline is connect by pulse valve with compressed gas packet.
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