CN107252629A - A kind of denitrating system and its method for changing catalyst layer - Google Patents
A kind of denitrating system and its method for changing catalyst layer Download PDFInfo
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- CN107252629A CN107252629A CN201710595997.3A CN201710595997A CN107252629A CN 107252629 A CN107252629 A CN 107252629A CN 201710595997 A CN201710595997 A CN 201710595997A CN 107252629 A CN107252629 A CN 107252629A
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- 239000003054 catalyst Substances 0.000 title claims abstract description 147
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000009434 installation Methods 0.000 claims abstract description 131
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000003546 flue gas Substances 0.000 claims abstract description 49
- 239000000779 smoke Substances 0.000 claims description 23
- 230000008929 regeneration Effects 0.000 claims description 14
- 238000011069 regeneration method Methods 0.000 claims description 14
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 12
- 238000012544 monitoring process Methods 0.000 claims description 12
- 238000012806 monitoring device Methods 0.000 claims description 7
- 229910021529 ammonia Inorganic materials 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000011144 upstream manufacturing Methods 0.000 abstract description 4
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 abstract description 3
- 239000000428 dust Substances 0.000 abstract description 3
- 238000013517 stratification Methods 0.000 abstract description 3
- 230000008859 change Effects 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 238000006555 catalytic reaction Methods 0.000 description 4
- 235000019504 cigarettes Nutrition 0.000 description 3
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
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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
- B01D53/86—Catalytic processes
- B01D53/88—Handling or mounting catalysts
-
- 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
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/90—Physical characteristics of catalysts
- B01D2255/902—Multilayered catalyst
- B01D2255/9025—Three layers
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (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)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a kind of denitrating system and its method for changing catalyst layer, replacing options include step：S10：First, second and third installation position for installing catalyst layer is set gradually along flue gas circulating direction in SCR reactors；S20：Catalyst layer is installed, the 3rd installation position is vacant on first and second installation position；S30：Monitor exiting flue gas；S40：If exiting flue gas is not up to standard, the catalyst layer on the first installation position is removed, catalyst layer is installed on the 3rd installation position；S50：Monitor exiting flue gas；S60：If exiting flue gas is not up to standard, the catalyst layer on the second installation position is removed, catalyst layer is installed on the first installation position；S70：Monitor exiting flue gas；S80：If exiting flue gas is not up to standard, the catalyst layer on the 3rd installation position is removed, catalyst layer is installed on the second installation position, and perform step S30.The present invention meets discharged nitrous oxides index, reduces system internal resistance, reduces the corrosion of dust stratification and upstream device in reactor, reduces catalyst change expense.
Description
Technical field
The present invention relates to the replacing options of catalyst layer in SCR denitration system, espespecially a kind of denitrating system and its replacing are urged
The method of agent layer.
Background technology
The principle of selective catalytic reduction (Selective Catalytic Reduction, SCR) is made in catalyst
Under, reducing agent NH3Selectively by NO and NO at 290-400 DEG C2It is reduced into N2, and hardly occur NH3With O2Oxidation
Reaction, so as to improve N2Selectivity, reduce NH3Consumption.
For meet denitration SCR device outlet NOx concentration it is steady in a long-term≤50mg/Nm3Environmental requirement, install spare level additional and urge
Agent is widespread practice the most.Although but denitration efficiency can be improved by installing spare level catalyst additional, also be brought simultaneously
Many detrimental effects.Install additional after spare level catalyst, due to the gross thickness increase of catalyst layer, the resistance of SCR denitration system
200Pa or so can be increased, resistance increase can cause the increase of air-introduced machine power consumption, operating cost increase, while can also make original two
The mechanical wear degree increase of layer catalyst, recyclability reduction；Plus SO after layer2/SO3Conversion ratio can raise, be easily caused downstream
Air preheater corrosion；And add the flow field adaptability in layer post-reactor worse, easily cause dust stratification.
Therefore, the applicant is directed to a kind of method for providing new a kind of denitrating system and its changing catalyst layer.
The content of the invention
It is an object of the invention to provide a kind of denitrating system and its method for changing catalyst layer, urged without spare level
In the case of agent, coal-burning power plant's discharged nitrous oxides index is met, and effectively reduces the resistance of SCR denitration system, is reduced
The corrosion phenomenon of the upstream devices such as fouling phenomenon and air preheater in reactor, can also effectively reduce in system catalyst more
Expense is changed, and the regeneration period of catalyst is shorter, can also avoid long-time halting problem of the unit caused by catalyst problem.
The technical scheme that the present invention is provided is as follows：
A kind of method of catalyst layer in replacing denitrating system, including step：
S10：In SCR reactors the first installation for installing catalyst layer is set gradually along the circulating direction of flue gas
Position, the second installation position and the 3rd installation position；
S20：Catalyst layer is installed on first installation position and the second installation position respectively, the 3rd installation position is empty
Put；
S30：Monitor the flue gas of the smoke outlet of the SCR reactors；
S40：If the flue gas of the smoke outlet of the SCR reactors is not up to default discharge index, removes first and install
Catalyst layer on position, installs catalyst layer on the 3rd installation position, and first installation position is vacant；
S50：Continue the flue gas in the exit of the monitoring SCR reactors；
S60：If the flue gas of the smoke outlet of the SCR reactors is not up to default discharge index, removes second and install
Catalyst layer on position, installs catalyst layer on first installation position, and second installation position is vacant；
S70：Continue the flue gas in the exit of the monitoring SCR reactors；
S80：If the flue gas of the smoke outlet of the SCR reactors is not up to default discharge index, removes the 3rd and install
Catalyst layer on position, installs catalyst layer, the 3rd installation position is vacant, and performs the step on second installation position
Rapid S30.
Preferably, the catalyst layer is the catalyst layer after original catalyst layer or regeneration.
Preferably, in the step S20, the catalyst layer on first installation position and the second installation position is
Original catalyst layer；In the step S40, the catalyst layer on the 3rd installation position is not for the first time
It is the catalyst layer after regeneration in used catalyst layer, following cycle step；In the step 40, step 60 and step 80
In, the catalyst layer first carries out regeneration treatment after being removed, wait follow-up recycle.
Preferably, the method for changing catalyst layer in denitrating system also includes step S90：Monitor the denitrating system
In spray ammonia situation, and adjust ammonia-spraying grid, improve the uniformity of spray ammonia.
The invention also discloses a kind of denitrating system, including：Along the stream of flue gas in SCR reactors, the SCR reactors
Logical direction is sequentially provided with the first installation position, the second installation position and the 3rd installation position；Three catalyst layers, three catalyst layers
It is removably mounted on first installation position, the second installation position or the 3rd installation position；Flue gas monitoring device, is arranged on described
The smoke outlet of SCR reactors, for monitoring whether the flue gas of smoke outlet of the SCR reactors reaches default discharge
Index, and indicate the SCR reactors successively according to the first operation phase, the second operation phase and the 3rd fortune according to monitoring result
Row order section carries out circular flow.
When the SCR reactors are in first operation phase, divide on first installation position and the second installation position
Not She You catalyst layer, the 3rd installation position is vacant；It is described when the SCR reactors are in second operation phase
Catalyst layer is respectively equipped with second installation position and the 3rd installation position, first installation position is vacant；At the SCR reactors
When three operation phase, catalyst layer, second peace are respectively equipped with the 3rd installation position and the first installation position
Fill position vacant.
Preferably, first installation position, the second installation position and the 3rd installation bit architecture are identical, and first installation position
Including a pair of slide rails, slide rail described in a pair is arranged on the inwall of the SCR reactors；Set on the side wall of the SCR reactors
Have and a switch gate for being used to closing and opening the opening, three openings point are respectively provided with three openings, and each opening
Do not corresponded with first installation position, the second installation position and the 3rd installation position；The catalyst layer includes catalyst, is used for
The framework and at least one pair of roller of the catalyst is fixedly mounted, the roller is used to drive the framework to move up in the slide rail
It is dynamic.
Preferably, the denitrating system also includes：Alarm, is connected with flue gas monitoring device communication, for described
The alert when flue gas of the smoke outlet of SCR reactors is not up to default discharge index.
Preferably, the denitrating system also includes：Catalyst regenerator, for the first catalyst layer after use,
Two catalyst layers or the 3rd catalyst layer are regenerated.
A kind of denitrating system and its method for replacing catalyst layer that the present invention is provided, can bring following at least one to have
Beneficial effect：
1st, the cigarette that the method for the replacing catalyst layer of denitrating system of the invention passes through the smoke outlet to SCR reactors
Gas is monitored, it is ensured that exiting flue gas meets the discharge index of the nitrogen oxides of coal-burning power plant, in addition, the method for the present invention exists
All the time two catalyst layers are provided with SCR reactors, it can thus be avoided SCR denitration system caused by the catalyst number of plies is more
The problem of resistance is larger, reduce further blower fan power consumption and operating cost, caused by the catalyst number of plies can also be avoided more
The problem of reactor flow field bad adaptability and easy dust stratification and air preheater etc. upstream device corrosion phenomenon.
2nd, denitrating system of the invention is using the method for successively changing catalyst layer, so that the catalyst in denitrating system
Layer can keep maximum catalytic activity, and a period of time rear catalyst will have been used, which to remove and carry out regeneration, can reduce it
Rate of decay, so as to save the renewal cost of catalyst, in addition, the regeneration period of catalyst is short, can avoid unit because of catalysis
The long-time that agent problem is caused is shut down.
Brief description of the drawings
Below by clearly understandable mode, preferred embodiment is described with reference to the drawings, to the present invention denitrating system and
Its above-mentioned characteristic, technical characteristic, advantage and its implementation for changing the method for catalyst layer are further described.
Fig. 1 is the flow for changing a kind of specific embodiment of the method for catalyst layer in the denitrating system signal of the present invention
Figure；
Fig. 2 is a kind of structural representation of specific embodiment of the denitrating system of the present invention.
Drawing reference numeral explanation：
SCR reactors 10, smoke inlet 11, exhanst gas outlet 12, the first installation position 21, the second installation position 22, the 3rd installs
Position 23.
Embodiment
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, control is illustrated below
The embodiment of the present invention.It should be evident that drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing, and obtain other embodiments.To make only schematically show and phase of the present invention in simplified form, each figure
The part of pass, they do not represent it as the practical structures of product.
As shown in figure 1, this specific embodiment discloses a kind of method for changing catalyst layer in denitrating system, including step
Suddenly：
S10：In SCR reactors the first installation for installing catalyst layer is set gradually along the circulating direction of flue gas
Position, the second installation position and the 3rd installation position；
S20：Catalyst layer is installed on first installation position and the second installation position respectively, the 3rd installation position is vacant；
S30：Monitor the flue gas of the smoke outlet of SCR reactors；
S40：If the flue gas of the smoke outlet of SCR reactors is not up to default discharge index, remove on the first installation position
Catalyst layer, catalyst layer is installed on the 3rd installation position, the first installation position is vacant；
S50：Continue the flue gas in the exit of monitoring SCR reactors；
S60：If the flue gas of the smoke outlet of SCR reactors is not up to default discharge index, remove on the second installation position
Catalyst layer, catalyst layer is installed on the first installation position, the second installation position is vacant；
S70：Continue the flue gas in the exit of monitoring SCR reactors；
S80：If the flue gas of the smoke outlet of SCR reactors is not up to default discharge index, remove on the 3rd installation position
Catalyst layer, catalyst layer is installed on the second installation position, the 3rd installation position is vacant, and performs step S30.
Specifically, in step S20, the catalyst layer on the first installation position and the second installation position is to be not used
Fresh catalyst layer；In step s 40, catalyst layer for the first time on the 3rd installation position is original new
It is the catalyst layer after regeneration in fresh catalyst layer, following cycle step；In step 40, step 60 and step 80, catalysis
Oxidant layer first carries out regeneration treatment after being removed, wait follow-up recycle.
Specifically, changing the method for catalyst layer in denitrating system also includes step S90：Monitor the spray ammonia in denitrating system
Situation, and ammonia-spraying grid is adjusted, improve the uniformity of spray ammonia.
This method can also use CFD (Computational Fluid in the running of two layers of catalyst
Dynamics, i.e. computational fluid dynamics method for numerical simulation), influence of the research flue gas to catalyst layer, and reasonably optimizing is anti-
Answer device flow field situation.Furthermore it is also possible to regular sampling Detection is carried out to the catalyst layer after dismounting, and according to existing catalyst
The database of operation, analysis is predicted to its life-span.
In the method, two catalyst layers are remained in SCR reactors, when changing, piecemeal removal first is installed
Catalyst layer on position, the second installation position and the 3rd installation position, then installs urging after fresh catalyst layer or regeneration again
Agent layer, that is to say, that, it is only necessary to three layers of catalyst layer are recycled, it is possible to realize this replacing options.This method exists
In the case of without spare level catalyst, coal-burning power plant's discharged nitrous oxides index can be met, and it is de- to effectively reduce SCR
The corrosion phenomenon of the upstream devices such as fouling phenomenon and air preheater in the resistance of nitre system, reduction reactor.Also, this method can
To save up to 30% catalyst change expense, and the regeneration period of catalyst is shorter, it is possible to prevente effectively from unit is because of catalysis
The problem of long-time that agent problem is caused is shut down.
Of course, in changing in denitrating system in other specific embodiments of the method for catalyst layer for the present invention, catalysis
Oxidant layer can select fresh untapped catalyst layer according to actual needs, can also use the catalyst layer after regeneration；Step
Rapid S90 can be operated selectively, and here is omitted.
As shown in Fig. 2 this specific embodiment discloses a kind of denitrating system, including：SCR reactors 10, SCR reactors 10
In along flue gas circulating direction (i.e. from smoke inlet 11 to the direction of exhanst gas outlet 12), be sequentially provided with the first installation position 21,
Second installation position 22 and the 3rd installation position 23；Three catalyst layers, three catalyst layers are removably mounted on the first installation position
21st, on the second installation position 22 or the 3rd installation position 23；Flue gas monitoring device (not shown), is arranged on the cigarette of SCR reactors 10
Whether gas outlet, the flue gas at exhanst gas outlet 12 for monitoring SCR reactors reaches default discharge index, and according to monitoring
As a result indicate that SCR reactors 10 carry out circulating according to the first operation phase, the second operation phase and the 3rd operation phase successively
OK.That is, when flue gas monitoring device monitors that the flue gas of the smoke outlet of SCR reactors does not reach default discharge index
When, SCR reactors 10 were just switched to for the second operation phase from the first operation phase, or is switched to from the second operation phase
Three operation phase, or it was switched to for the first operation phase from the 3rd operation phase.
When SCR reactors 10 were in for the first operation phase, it is respectively equipped with the first installation position 21 and the second installation position 22
Catalyst layer, the 3rd installation position 23 is vacant；When SCR reactors 10 were in for the second operation phase, the second installation position 22 and the 3rd
Catalyst layer is respectively equipped with installation position 23, the first installation position 21 is vacant；When SCR reactors 10 were in for three operation phase,
Catalyst layer is respectively equipped with 3rd installation position 23 and the first installation position 21, the second installation position 22 is vacant.
Specifically, the first installation position 21, the second installation position 22 are identical with the structure of the 3rd installation position 23, and the first installation position 21
Including a pair of slide rails, a pair of slide rails are arranged on the inwall of SCR reactors 10.The side wall of SCR reactors 10 is opened provided with three
Mouthful, and be respectively provided with the switch gate for closing and opening opening at each opening, three openings respectively with the first installation position 21, the
Two installation positions 22 and the 3rd installation position 23 are corresponded.Catalyst layer includes catalyst, the framework for catalyst to be fixedly mounted
With many pair rollers, roller is used to drive framework to move on slide rail.
Specifically, denitrating system also includes alarm (not shown), alarm is connected with the communication of flue gas monitoring device, used
The alert when flue gas of the smoke outlet in SCR reactors is not up to default discharge index.That is, working as cigarette
Gas monitor monitors to send a command to alarm when the flue gas of the smoke outlet of SCR reactors is not up to default discharge index
Device, alarm alert, staff changes corresponding catalyst layer according to warning message.
Specifically, denitrating system also includes catalyst regenerator (not shown), catalyst regenerator is used for using
The first catalyst layer, the second catalyst layer or the 3rd catalyst layer afterwards is regenerated.The system needs altogether in specific embodiment
Three layers of catalyst layer, the catalyst layer after being removed from three installation positions is first passed through to be carried out again after catalyst regenerator is regenerated
Utilize.
Of course, in other specific embodiments of the denitrating system of the present invention, the tool of three installation positions and catalyst layer
Body structure and assembling mode can carry out the adjustment of structure according to actual needs；Alarm and catalyst regenerator can be selected
Selecting property is set.
It should be noted that in the above two embodiments, default discharge index only needs to meet environmental requirement.
It should be noted that above-described embodiment can independent assortment as needed.Described above is only the preferred of the present invention
Embodiment, it is noted that for those skilled in the art, is not departing from the premise of the principle of the invention
Under, some improvements and modifications can also be made, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of method for changing catalyst layer in denitrating system, it is characterised in that including step：
S10：In SCR reactors along the circulating direction of flue gas set gradually for catalyst layer is installed the first installation position,
Second installation position and the 3rd installation position；
S20：Catalyst layer is installed on first installation position and the second installation position respectively, the 3rd installation position is vacant；
S30：Monitor the flue gas of the smoke outlet of the SCR reactors；
S40：If the flue gas of the smoke outlet of the SCR reactors is not up to default discharge index, remove on the first installation position
Catalyst layer, catalyst layer is installed on the 3rd installation position, first installation position is vacant；
S50：Continue the flue gas in the exit of the monitoring SCR reactors；
S60：If the flue gas of the smoke outlet of the SCR reactors is not up to default discharge index, remove on the second installation position
Catalyst layer, catalyst layer is installed on first installation position, second installation position is vacant；
S70：Continue the flue gas in the exit of the monitoring SCR reactors；
S80：If the flue gas of the smoke outlet of the SCR reactors is not up to default discharge index, remove on the 3rd installation position
Catalyst layer, catalyst layer is installed on second installation position, the 3rd installation position is vacant, and performs the step
S30。
2. the method for catalyst layer in denitrating system is changed as described in claim 1, it is characterised in that：
The catalyst layer is the catalyst layer after original catalyst layer or regeneration.
3. the method for catalyst layer in denitrating system is changed as described in claim 2, it is characterised in that：
In the step S20, the catalyst layer on first installation position and the second installation position is original
Catalyst layer；
In the step S40, the catalyst layer on the 3rd installation position is original catalyst for the first time
It is the catalyst layer after regeneration in layer, following cycle step；
In the step 40, step 60 and step 80, the catalyst layer first carries out regeneration treatment after being removed, and waits follow-up
Recycle.
4. the method for catalyst layer in denitrating system is changed as described in claim 1, it is characterised in that：
Also include step S90：The spray ammonia situation in the denitrating system is monitored, and adjusts ammonia-spraying grid, the uniform of spray ammonia is improved
Degree.
5. a kind of denitrating system, it is characterised in that including：
In SCR reactors, the SCR reactors the first installation position, the second installation position are sequentially provided with along the circulating direction of flue gas
With the 3rd installation position；
Three catalyst layers, three catalyst layers are removably mounted on first installation position, the second installation position or
On three installation positions；
Flue gas monitoring device, is arranged on the smoke outlet of the SCR reactors, and the flue gas for monitoring the SCR reactors goes out
Whether the flue gas at mouthful reaches default discharge index, and indicates the SCR reactors successively according to the first fortune according to monitoring result
Row order section, the second operation phase and the 3rd operation phase carry out circular flow；
When the SCR reactors are in first operation phase, set respectively on first installation position and the second installation position
There is catalyst layer, the 3rd installation position is vacant；
When the SCR reactors are in second operation phase, set respectively on second installation position and the 3rd installation position
There is catalyst layer, first installation position is vacant；
When the SCR reactors are in three operation phase, set respectively on the 3rd installation position and the first installation position
There is catalyst layer, second installation position is vacant.
6. denitrating system as claimed in claim 5, it is characterised in that：
First installation position, the second installation position and the 3rd installation bit architecture are identical, and first installation position includes a pair of cunnings
Rail, slide rail described in a pair is arranged on the inwall of the SCR reactors；
The side wall of the SCR reactors is used to closing and opening described provided with being respectively provided with one at three openings, and each opening
The switch gate of opening, three openings are corresponded with first installation position, the second installation position and the 3rd installation position respectively；
The catalyst layer includes catalyst, framework and at least one pair of roller for the catalyst to be fixedly mounted, the rolling
Take turns for driving the framework to be moved on the slide rail.
7. denitrating system as claimed in claim 5, it is characterised in that also include：
Alarm, is connected, the flue gas for the smoke outlet in the SCR reactors does not reach with flue gas monitoring device communication
To alert during default discharge index.
8. denitrating system as claimed in claim 5, it is characterised in that also include：
Catalyst regenerator, for being carried out again to the first catalyst layer after use, the second catalyst layer or the 3rd catalyst layer
It is raw.
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| CN201710595997.3A CN107252629A (en) | 2017-07-20 | 2017-07-20 | A kind of denitrating system and its method for changing catalyst layer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108636106A (en) * | 2018-05-16 | 2018-10-12 | 马鞍山科宇环境工程有限公司 | A kind of selective catalytic reduction equipment for denitrifying flue gas and its working method |
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Application publication date: 20171017 |