CN107088365A - A kind of Y types SCR system catalyst on-line continuous regenerating unit - Google Patents
A kind of Y types SCR system catalyst on-line continuous regenerating unit Download PDFInfo
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- CN107088365A CN107088365A CN201710338627.1A CN201710338627A CN107088365A CN 107088365 A CN107088365 A CN 107088365A CN 201710338627 A CN201710338627 A CN 201710338627A CN 107088365 A CN107088365 A CN 107088365A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
-
- 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
- B01D53/88—Handling or mounting catalysts
Abstract
The present invention provides a kind of Y types SCR system catalyst on-line continuous regenerating unit, including：One the oneth SCR reactors and one the 2nd SCR reactors；One smoke inlet pipelines；One flue switching construction, with one first station and one second station；During in the first station, smoke inlet pipelines are connected with the first SCR reactors；During in the second station, smoke inlet pipelines are connected with the 2nd SCR reactors；Connect the first catalyst regeneration system of the first SCR reactors；Connect the second catalyst regeneration system of the 2nd SCR reactors.The on-line regeneration of denitrating catalyst under the premise of unit is non-stop-machine, can be realized, unit is reduced caused by SCR catalyst activity declines by forced-stopping machine, improves the economic security operation level of unit.So as to save the operating cost of SCR system.
Description
Technical field
The present invention relates to coal-burning boiler atmosphere pollution control technology field, more particularly to SCR denitration consersion unit, specifically
It is related to a kind of Y types SCR system catalyst on-line continuous regenerating unit.
Background technology
During 13, coal fired power plant denitration minimum discharge is transformed into China emphasis NOxGas abatement important technology is arranged
One of apply.In China, process choice selective catalytic reduction (the Selective Catalytic of power station denitration technology main flow
Reduction, SCR), selective catalytic reduction refers in the presence of catalyst, utilizes reducing agent (such as NH3, liquefied ammonia, urine
Element) come " selective " with the NO in flue gasxReact and generate the N of nontoxic pollution-free2And H2O。
SCR denitration technology is to boiler smoke NOxControl effect very significantly, technology it is more ripe, stably, turned at present
In the world using a kind of most, most fruitful gas denitrifying technology.Under rational arrangement and temperature range, it can reach 80~
90% removal efficiency.Therefore, SCR denitration technology is widely used in the coal fired power plant of the country, what deserves to be explained is, its denitration
The activity of SCR catalyst can be heavily dependent on, when catalyst activity lowers, it is impossible to ensure unit according to the de- of design
Nitre efficiency is run, and interim replacing and the regenerated offline of catalyst module must be now carried out by forced-stopping machine, this is to unit
Economical operation causes detrimental effect.
In addition, the catalyst that SCR system is changed at present can only operate urging to specialty by modes such as lifting, transports
Agent recovery plant regenerates, and replacing, operating cost are very high, and This further reduces the economic performance of SCR system operation.
The content of the invention
In view of this, the deficiency existed for the current SCR system catalyst on-line regeneration aspect of solution, purpose of the present invention purport
A kind of Y types SCR system catalyst on-line continuous regenerating unit is being provided, denitration can be realized under the premise of unit is non-stop-machine
The on-line regeneration of catalyst, reduces unit caused by SCR catalyst activity declines by forced-stopping machine, improves the economic security of unit
Operation level.So as to save the operating cost of SCR system.
To achieve the above object, the concrete technical scheme that uses of the present invention is：
A kind of Y types SCR system catalyst on-line continuous regenerating unit, including：
One the oneth SCR reactors and one the 2nd SCR reactors；
One smoke inlet pipelines；
One flue switching construction, with one first station and one second station；During in the first station, smoke inlet pipelines
Connected with the first SCR reactors；During in the second station, smoke inlet pipelines are connected with the 2nd SCR reactors；
Connect the first catalyst regeneration system of the first SCR reactors；
Connect the second catalyst regeneration system of the 2nd SCR reactors.
Further, the first catalyst regeneration system and the second catalyst regeneration system link with flue switching construction,
When flue switching construction is in the first station, the first catalytic regeneration system operation, the second catalytic regeneration system shutdown；When flue is cut
Change structure and be in the second station, the second catalytic regeneration system operation, the first catalytic regeneration system shutdown.
Further, the first catalytic regeneration system is identical with the second catalytic regeneration system architecture, includes：
One regeneration gas transports blower fan, a regeneration gas heater, a regeneration gas main pipe and a regeneration gas spraying layer；
Regeneration gas transports blower fan and conveys catalyst regeneration gas to regeneration spraying layer by regeneration gas main pipe；
Regeneration hot-air heater is arranged at ajutage, to heatable catalyst regeneration gas；
Regeneration spray layer segment stretches into the first SCR reactors or the 2nd SCR reactors, to jet catalyst regeneration gas.
Further, the regeneration gas spraying layer includes：
The spraying layer main pipe of regeneration gas main pipe is connected, spraying layer main pipe is connected and the first SCR reactors or the is stretched into part
Some spraying layer branch pipes in two SCR reactors, spraying layer branch pipe stretches into the portion of the first SCR reactors or the 2nd SCR reactors
Set up separately and be equipped with multiple jets, do not extend into the first SCR reactors or the 2nd SCR reactors part be provided with Shuttoff Valve and/
Or control valve.
Further, the adjacent spraying layer branch interval is between 1000mm~2000mm, single spraying layer branch pipe
The upper a number of jet of arrangement, injection open height is 50mm~100mm, and a diameter of 800~120mm, jet is arranged most
Large-spacing is not higher than 400mm, and jet injection direction is consistent with flue gas direction of flow.
Further, the first SCR reactors and the 2nd SCR inside reactors arrange some layers of catalyst layer, institute
Regeneration gas spraying layer is stated to be arranged in above first floor catalyst layer at 500mm~1500mm.
Further, the flue switching construction is a rotation gas baffle；
First SCR reactors and the 2nd SCR reactors are arranged along a symmetrical axial symmetry；The gas approach of the two is respectively provided with one
Opening；
The pivot for rotating gas baffle is located on the symmetry axis；During in the first station, the edge rotation of rotation gas baffle
Turn the opening that central rotation closes the gas approach of the first SCR reactors；During in the second station, the edge rotation of rotation gas baffle
Central rotation closes the opening of the gas approach of the 2nd SCR reactors.
Further, between the width of the rotation gas baffle is 8000~200000mm, length is reacted with the first SCR
Device or the longitudinal depth of the 2nd SCR reactors are consistent.
Further, the whole edge of rotation gas baffle is provided with sealing structure (such as rubber integument, the rubber being embedded
Sealing strip).
Further, the regeneration hot-air heater is electric heater or waste heat flue gas heater.
The device realizes the online switching of operation/on-line regeneration reactor, rotation by adjusting the position of rotation gas baffle
Turn gas baffle and have the first station, two steady-working states of the second station, the throwing of Benitration reactor one, two is realized respectively
Fortune/stoppage in transit state.When rotating gas baffle and being in the first station, the first catalytic regeneration system operation, at Benitration reactor one
In stoppage in transit state, denitration reaction is not carried out, when rotation gas baffle is in the second station, the second catalytic regeneration system operation, denitration
Reactor one is in the state that puts into operation, and is normally carried out denitration reaction.
Compared with prior art, the present invention has the advantage that：
When current coal fired power plant SCR system faces catalyst activity reduction problem, dust stratification can only be overhauled by unit outage
The replacing of catalyst is carried out, spent catalyst is transported in professional catalyst factory and realizes regenerated offline, and operating cost is larger；And
A kind of Y types SCR system catalyst on-line continuous regenerating unit disclosed in this invention, is realizing the on-line regeneration of SCR catalyst,
The regeneration frequency of SCR catalyst is dramatically increased, and can ensure the denitration performance of catalyst to greatest extent, while eliminating catalyst more
A series of flows such as change, lift, transporting, significantly reducing the operating cost of unit, improving the economic security operation water of unit
It is flat.
Brief description of the drawings
Fig. 1 is Y type SCR system catalyst on-line continuous regenerating unit general arrangement schematics in case study on implementation of the present invention.
Fig. 2 is regeneration gas spray equipment schematic diagram in case study on implementation of the present invention.
Embodiment
The present invention is described in detail below in conjunction with the accompanying drawings, and the implementation case is carried out lower premised on the technical program
Implement, it should be understood that case study on implementation is that, in order to illustrate the present invention, but protection scope of the present invention is not limited to described implementation
Case.
As shown in figure 1, a kind of Y types SCR system catalyst on-line continuous regenerating unit is provided in embodiment, including：The
One SCR reactors 5 and the 2nd SCR reactors 13；Smoke inlet pipelines；Flue switching construction, with the first station 7 and the second work
Position 8；During in the first station 7, smoke inlet pipelines are connected with the first SCR reactors 5；During in the second station 8, smoke inlet
Pipeline is connected with the 2nd SCR reactors 13；
Connect the first catalyst regeneration system of the first SCR reactors 5；
Connect the second catalyst regeneration system of the 2nd SCR reactors 13.
First catalyst regeneration system and the second catalyst regeneration system link with flue switching construction, when flue switching
Structure is in the first station 7, the first catalytic regeneration system operation, the second catalytic regeneration system shutdown；At flue switching construction
In the second station 8, the second catalytic regeneration system operation, the first catalytic regeneration system shutdown.
First catalytic regeneration system is identical with the second catalytic regeneration system architecture, includes：
Regeneration gas transports blower fan 1/9, regeneration hot-air heater 2/10, regeneration gas main pipe 3/11 and regeneration gas spraying layer；
Regeneration gas transports blower fan 1/9 and conveys catalyst regeneration gas to regeneration spraying layer by regeneration gas main pipe 3/11；
Regeneration hot-air heater 2/10 is arranged at ajutage, to heatable catalyst regeneration gas；
The first SCR reactors or the 2nd SCR reactors are stretched into regeneration spraying layer 4/12 part, to jet catalyst regeneration
Gas.
As shown in Fig. 2 regeneration gas spraying layer 4/12 includes：Connect the spraying layer main pipe 17 of regeneration gas main pipe 3/11, connection
Some spraying layer branch pipes 16 that spraying layer main pipe 17 and part are stretched into the first SCR reactors 5 or the 2nd SCR reactors 13, spray
Drenching layer branch pipe 16 stretches into the first SCR reactors 5 or the part of the 2nd SCR reactors 13 is provided with multiple jets 18, does not extend into
The part of first SCR reactors 5 or the 2nd SCR reactors 13 is provided with control valve 15, the optional Shuttoff Valve of control valve 15
And/or control valve.
Adjacent spraying layer branch pipe 16 is spaced between 1000mm~2000mm, and a fixed number is arranged on single spraying layer branch pipe 16
The jet 18 of amount, the height of jet 18 is 50mm~100mm, a diameter of 800~120mm, the arrangement largest interval of jet 18
Not higher than 400mm, the injection direction of jet 18 is consistent with flue gas direction of flow.
Some layers of catalyst layer 6/14 are arranged inside first SCR reactors 5 and the 2nd SCR reactors 13, gas blowout is regenerated
Drenching layer 4/12 is arranged in above first floor catalyst layer at 500mm~1500mm.
Flue switching construction is a rotation gas baffle；
First SCR reactors 5 and the 2nd SCR reactors 13 are arranged along a symmetrical axial symmetry；The gas approach of the two has
There is an opening；
The pivot for rotating gas baffle is located on the symmetry axis；During in the first station 7, the edge rotation of rotation gas baffle
Turn the opening that central rotation closes the gas approach of the first SCR reactors 5；During in the second station 8, the edge rotation of rotation gas baffle
Turn the opening that central rotation closes the gas approach of the 2nd SCR reactors.
The width for rotating gas baffle is length and the first SCR reactors 5 or the 2nd SCR between 8000~200000mm
The longitudinal depth of reactor 13 is consistent, and regeneration hot-air heater 2/10 is electric heater, waste heat flue gas heater.
The whole edge of rotation gas baffle is provided with sealing structure (such as rubber integument, the rubber weather strip being embedded).
By taking an engineering physical device as an example, SCR system catalyst on-line continuous is carried out again for certain 350MW coal unit
Raw, device transports blower fan, 2 regeneration hot-air heaters, 2 tunnel regeneration gas main pipes, 2 groups of regeneration gas spraying layers, 2 including 2 regeneration gases
Individual SCR reactors, 1 rotation gas baffle, said modules synergism function realize SCR system catalyst on-line continuous jointly
Regeneration.
The device realizes the online switching of operation/on-line regeneration reactor, rotation by adjusting the position of rotation gas baffle
Turn gas baffle and have two steady-working states of A, B, reactor A, the B/stoppage in transit state that puts into operation are realized respectively.When rotation flue gas
When baffle plate is in A states, A sides Benitration reactor is in run mode, is normally carried out denitration reaction, regeneration gas transport and spray system at
In stoppage in transit state, and B sides Benitration reactor is in on-line regeneration state, denitration reaction is not carried out, regeneration gas is transported and spray system
In the state of putting into operation；When rotating gas baffle in B states, A sides Benitration reactor is in on-line regeneration state, denitration is not carried out anti-
Should, regeneration gas is transported and spray system is in the state that puts into operation, and B sides Benitration reactor is in run mode, is normally carried out denitration anti-
Should, regeneration gas is transported and spray system is in stoppage in transit state.
Regeneration gas is conveyed and the operating control device of spray system links with rotating the drive dynamic control device of gas baffle, connection
Dynamic specific implementation can be that the control device of the two accesses main factory DCS (dcs), using existing hard
Part and software, the two linkage of control.
Gas baffle is rotated in the device to be needed to turn to after dbjective state, is compressed and sealed using hydraulic way；Rotate cigarette
The width of gas baffle plate is 150000mm, and length is consistent with the longitudinal depth of goal systems, is 13500mm, the regeneration gas heating
Device heats for heat smoke.
Regeneration gas component is the neat stress drawn from the net flue of afterbody, and its flow is the 5%- of flue gas total flow at full capacity
15%；Regeneration gas flow becomes frequency modulation in the 5%-15% of flue gas total flow at full capacity is interval in the regeneration gas conveying first stage
Control；Regeneration gas transports regeneration gas flow in second stage and steadily transported in 10% level of flue gas total flow at full capacity.Regeneration
The first stage of gas conveying is identical with the second stage duration.Regeneration gas spraying layer is made up of seven groups of pipelines, between adjacent tubes
19 jets of the same size of arrangement in 1750mm, single conduit, a diameter of 80mm of jet are divided into, injection open height is
50mm, jet arrangement largest interval is 400mm.Regeneration gas spraying layer is arranged in 1000mm positions above first floor catalyst, often
One group of spraying layer is respectively arranged in individual SCR reactors.
In catalyst regeneration process, though Benitration reactor of the correspondence in regeneration state is suitable for reading to be open, and top
There is butterfly limitation so as to form closing space, and regeneration gas is flue gas, does not result in the excessive of bad air.Reactor
First, after two exhaust pass switch through gas baffle with corresponding air preheater gas approach together with, it is ensured that complete at follow-up flue gas
Science and engineering skill.
In the implementation case, based on Y type SCR system catalyst on-line continuous regenerating units, kept off by changing rotation flue gas
The position of plate and other correspondence annexes, realize the on-line regeneration of SCR system catalyst, ensure that SCR system is urged to greatest extent
The optimum activity of agent, improves the economic security operation level of unit.
Although the embodiment of the present invention is described as described above, combining specific implementation case and accompanying drawing,
But it shall not be construed as to the limitation of itself of the invention.On the basis of technical scheme, any entity or individual are not
Need to pay various modifications or deform still within protection scope of the present invention that creative work can make.
Claims (10)
1. a kind of Y types SCR system catalyst on-line continuous regenerating unit, it is characterised in that including：
One the oneth SCR reactors and one the 2nd SCR reactors；
One smoke inlet pipelines；
One flue switching construction, with one first station and one second station；During in the first station, smoke inlet pipelines and the
One SCR reactors are connected；During in the second station, smoke inlet pipelines are connected with the 2nd SCR reactors；
Connect the first catalyst regeneration system of the first SCR reactors；
Connect the second catalyst regeneration system of the 2nd SCR reactors.
2. Y types SCR system catalyst on-line continuous regenerating unit as claimed in claim 1, it is characterised in that the first catalyst
Regenerative system and the second catalyst regeneration system with flue switching construction link, when flue switching construction be in the first station,
First catalytic regeneration system operation, the second catalytic regeneration system shutdown；When flue switching construction is in the second station, the second catalysis
Regenerative system is run, the first catalytic regeneration system shutdown.
3. Y types SCR system catalyst on-line continuous regenerating unit as claimed in claim 1, it is characterised in that described first urges
Change regenerative system identical with the second catalytic regeneration system architecture, include：
One regeneration gas transports blower fan, a regeneration gas heater, a regeneration gas main pipe and a regeneration gas spraying layer；
Regeneration gas transports blower fan and conveys catalyst regeneration gas to regeneration spraying layer by regeneration gas main pipe；
Regeneration hot-air heater is arranged at ajutage, to heatable catalyst regeneration gas；
Regeneration spray layer segment stretches into the first SCR reactors or the 2nd SCR reactors, to jet catalyst regeneration gas.
4. Y types SCR system catalyst on-line continuous regenerating unit as claimed in claim 1, it is characterised in that the regeneration gas
Spraying layer includes：
The spraying layer main pipe of regeneration gas main pipe is connected, spraying layer main pipe is connected and the first SCR reactors or the 2nd SCR is stretched into part
Some spraying layer branch pipes in reactor, spraying layer branch pipe stretches into the first SCR reactors or the part of the 2nd SCR reactors is set
There are multiple jets, the part for not extending into the first SCR reactors or the 2nd SCR reactors is provided with Shuttoff Valve and/or regulation
Valve.
5. Y types SCR system catalyst on-line continuous regenerating unit as claimed in claim 4, it is characterised in that the adjacent spray
Drenching layer branch interval between 1000mm~2000mm, it is described injection open height be 50mm~100mm, a diameter of 800~
120mm, jet arrangement largest interval is not higher than 400mm, and jet injection direction is consistent with flue gas direction of flow.
6. Y types SCR system catalyst on-line continuous regenerating unit as claimed in claim 4, it is characterised in that described first
SCR reactors and the 2nd SCR inside reactors arrange some layers of catalyst layer, and the regeneration gas spraying layer is arranged in the first floor and urged
At agent layer top 500mm~1500mm.
7. Y types SCR system catalyst on-line continuous regenerating unit as claimed in claim 1, it is characterised in that the flue is cut
It is a rotation gas baffle to change structure；
First SCR reactors and the 2nd SCR reactors are arranged along a symmetrical axial symmetry；The gas approach of the two is respectively provided with one and opened
Mouthful；
The pivot for rotating gas baffle is located on the symmetry axis；During in the first station, rotation gas baffle is along along rotation
The opening of the gas approach of the SCR reactors of heart closed rotary the first；During in the second station, gas baffle is rotated along pivot
The opening of the gas approach of the SCR reactors of closed rotary the 2nd.
8. Y types SCR system catalyst on-line continuous regenerating unit as claimed in claim 7, it is characterised in that the rotation cigarette
The width of gas baffle plate is length and the first SCR reactors or the longitudinal depth one of the 2nd SCR reactors between 8000~200000mm
Cause.
9. Y types SCR system catalyst on-line continuous regenerating unit as claimed in claim 1, it is characterised in that rotation flue gas gear
The whole edge of plate is provided with sealing structure.
10. Y types SCR system catalyst on-line continuous regenerating unit as claimed in claim 1, it is characterised in that the regeneration
Hot-air heater is electric heater or waste heat flue gas heater.
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| CN201710338627.1A CN107088365A (en) | 2017-05-15 | 2017-05-15 | A kind of Y types SCR system catalyst on-line continuous regenerating unit |
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| CN201710338627.1A CN107088365A (en) | 2017-05-15 | 2017-05-15 | A kind of Y types SCR system catalyst on-line continuous regenerating unit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108355493A (en) * | 2018-05-18 | 2018-08-03 | 武汉致衡环境安全工程技术有限公司 | A kind of Secondary Air collaboration SCR low temperature catalyst regenerative systems |
| CN108722501A (en) * | 2018-05-28 | 2018-11-02 | 东南大学 | A kind of swinging denitrating catalyst on-line regeneration method and device |
| US10722844B2 (en) * | 2018-08-22 | 2020-07-28 | Shell Oil Company | Selective catalytic reduction process and method of regenerating deactivated SCR catalyst of a parallel flue gas treating system |
| US10814277B2 (en) | 2018-08-22 | 2020-10-27 | Shell Oil Company | Selective catalytic reduction process and off-line regeneration of deactivated catalyst of the process |
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| US10814277B2 (en) | 2018-08-22 | 2020-10-27 | Shell Oil Company | Selective catalytic reduction process and off-line regeneration of deactivated catalyst of the process |
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Application publication date: 20170825 |