CN206950948U - A kind of boiler SCR denitration system - Google Patents
A kind of boiler SCR denitration system Download PDFInfo
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- CN206950948U CN206950948U CN201720308809.XU CN201720308809U CN206950948U CN 206950948 U CN206950948 U CN 206950948U CN 201720308809 U CN201720308809 U CN 201720308809U CN 206950948 U CN206950948 U CN 206950948U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
A kind of boiler SCR denitration system of the utility model,Connected including an oxidation unit by the exhaust opening of a pipeline a and boiler and a desulfurizer is connected by a pipeline b with oxidation unit and a denitrification apparatus is connected by pipeline c with desulfurizer,Oxidation unit includes the oxidation pond for filling hydrogen peroxide and a lid of sealing oxidation pond openend,Pipeline a tail end is stretched into hydrogen peroxide through lid,Pipeline b head end stretches into oxidation pond through lid,Desulfurizer is built with quick lime,Denitrification apparatus is sequentially provided with a distributed matrix flowmeter from the direction of flow of flue gas,One sampling detection structure X,One ammonia-spraying grid and a SCR reactors and a sampling detection structure Y,The input of distributed matrix flowmeter and sampling detection structure X and sampling detection structure Y with a Flow Field Distribution controller communicates to connect,The output end of ammonia-spraying grid and Flow Field Distribution controller communicates to connect,Pipeline a is provided with an air exhauster.
Description
Technical field
It the utility model is related to gas denitrifying technology field, and in particular to a kind of boiler SCR denitration system.
Background technology
With the development and growth in the living standard of modern industrial production, atmosphere pollution is asked into what people extremely paid close attention to
Topic.It there is one big, nitrogen oxides NO in atmosphere pollutionxPollution problem.NOxLight can be caused in the presence of sunlight
Chemical reaction, photochemical fog is formed, so as to cause serious atmosphere pollution.NOxAtmosphere polluting problem by pay attention to day by day,
It is found that：Injury, high content nitric acid rain, photochemical fog, ozone reduction and some other problem of health with
Low concentration of NOxThere is relation, and its harmfulness imagination more original than people is much greater.
But in boiler smoke, not only containing nitrogen oxides NOx, also sulfide SOxIf simply denitration, still avoid
Not pollution to environment, moreover, SO3Can be with spraying the NH sprayed in ammonia pipe3The material NH for the generation viscosity that reacts4HSO4,
NH4HSO4It can block the catalyst duct in SCR reactors, the active surface of covering catalyst, reduce the performance of catalyst.And
And also contain a large amount of dust in flue gas, the SCR reactors of denitration can be also blocked, reduce its service life.Simultaneously at present in SCR works
In skill, the control for ammonia spraying amount only has a total valve aperture to control spray ammonia flow, branch's spray ammonia pipeline after total valve
Only hand-operated valve adjustment aperture, can not realize the subregional online finely regulating of flue.The main of control strategy is asked at present
Topic is that by single measuring point as regulation target, and the accuracy and representativeness of single measuring point are poor, also do not consider whole flue cross section
Emission distribution；And in order to reach unit emission limit requirement, ammonia spraying amount control take " peaceful more do not lack " mode (in order to
Make the NO of dischargexConcentration is up to standard, and spraying into ammonia as much as possible makes more NOxDecomposition is reduced, makes NOxEmission compliance), pole
It is excessive to easily cause local spray ammonia.Although SCR exports NOxConcentration of emission it is up to standard, but excessive ammonia spraying amount is converted into the escaping of ammonia
Air inlet preheater, acid medium, steam reaction with air inlet preheater, generation NH4HSO4 etc. harmful substances and
Air preheater is blocked, causes the serious consequences such as equipment damage and unit outage.
Utility model content
In order to solve the above technical problems, the purpose of this utility model is the provision of a kind of boiler SCR denitration system, with solution
The defects of certainly existing SCR reactor lifetimes are short and sulfide influences ammonia denitration.
To achieve the above object, a kind of boiler SCR denitration system of the utility model, including an oxidation unit pass through a pipe
The exhaust opening of road a and boiler connects and a desulfurizer is connected by a pipeline b with the oxidation unit and a denitrification apparatus
It is connected by pipeline c with the desulfurizer, the oxidation unit includes the oxidation pond for filling hydrogen peroxide and seals the oxygen
One lid of Hua Chi openends, the tail end of the pipeline a are stretched into the hydrogen peroxide through the lid, the head of the pipeline b
The oxidation pond is stretched into end through the lid, and the desulfurizer is built with quick lime, and the denitrification apparatus is from flow of flue gas
Direction be sequentially provided with a distributed matrix flowmeter, a sampling detection structure X, an ammonia-spraying grid and a SCR reactors and
One sampling detection structure Y, the distributed matrix flowmeter and the sampling detection structure X and the sampling detection structure Y
Input with a Flow Field Distribution controller communicates to connect, the output end of the ammonia-spraying grid and the Flow Field Distribution controller
Communication connection, the pipeline a are provided with an air exhauster.
Preferably, the ammonia-spraying grid has some spray ammonia modules of rectangular distribution, and each spray ammonia module includes
The main pipe being connected with ammonia source, the end of the main pipe connect with a connecting tube, and the opposite end of the connecting tube respectively sprays with one
Ammonia branch pipe is connected, and the direction where having some nozzles towards the SCR reactors on each spray ammonia branch pipe is set.
Preferably, some nozzles on the same spray ammonia branch pipe are distributed in the spray ammonia branch pipe and the corresponding company
The opposite sides of adapter connectivity part, and wherein the nozzle quantity of side is more than the nozzle quantity of corresponding opposite side.
Preferably, the sampling detection structure X includes some sampling branch pipe x and some spray ammonia modules correspond,
The suction nozzle of each sampling branch pipe x ends is in the surface of the corresponding spray ammonia module centers.
Preferably, the input of the Flow Field Distribution controller has some input ports, and each sampling branch pipe x is equal
An input port communication connection corresponding with the Flow Field Distribution controller.
Preferably, the sampling detection structure Y includes some sampling branch pipe y and some spray ammonia modules correspond,
The suction nozzle of each sampling branch pipe y ends is in the underface of the corresponding spray ammonia module centers.
Preferably, the input of the Flow Field Distribution controller has some input ports, and each sampling branch pipe y is equal
An input port communication connection corresponding with the Flow Field Distribution controller.
Preferably, it is equipped with an electric control valve in each main pipe.
Preferably, it is defeated including a data analysis module and the Flow Field Distribution controller in the Flow Field Distribution controller
Enter end communication connection to be used to analyze gas flow and gas concentration, and a data processing module and the Flow Field Distribution controller
Output end is communicated to connect for the data according to gas flow and gas concentration to send control command, the data analysis module
Communicated to connect with the data processing module.
Compared with prior art, its advantage is the utility model：A kind of boiler SCR denitration system of the present utility model
System, the flue gas come out from boiler first pass through the hydrogen peroxide, and part NO therein is by hydrogen peroxide oxidation into NO2, then with steam
Flue gas by pipeline b by the quick lime desulfurization in the desulfurizer and de- partially acidic itrated compound, while dry flue gas, cigarette
SO in gas3Taken off, NO and NO in pipeline c2NH into the denitrification apparatus and the denitrification apparatus3It is anti-in the SCR
Reaction in device is answered to generate harmless N2And H2O is discharged；And reported according to domestic and international correlative study, and verified through laboratory experiment, when
NO present in flue gas2When mol ratio with NO is 1, " FAST SCR " reactions, the reaction speed can occur in SCR reactors
Be far longer than in flue gas only have NO reaction speed, and existing boiler emission come out most nitrogen oxides NOxWith NO shapes
Formula is present, so oxidation unit oxidized portion NO of the present utility model is allowed to become NO2, greatly improve and reacted in the SCR
The reaction speed of device, being capable of the abundant denitration in the shorter time.The distributed matrix flowmeter and the sampling inspection simultaneously
The input of geodesic structure X and the sampling detection structure Y with the Flow Field Distribution controller communicates to connect, the spray ammonia lattice
The output end of grid and the Flow Field Distribution controller communicates to connect, so as to which the Flow Field Distribution controller can be according to described
Distributed matrix flowmeter and the sampling detection structure X and the gas flow and gas of the sampling detection structure Y collections
Concentration data control in real time the ammonia-spraying grid spray ammonia flow and spray ammonia speed, effectively avoid because the waste of ammonia and caused by
Secondary pollution.
Brief description of the drawings
Fig. 1 is a kind of overall structure diagram of boiler SCR denitration system of the utility model；
Fig. 2 is a kind of structure chart of the ammonia-spraying grid of boiler SCR denitration system of the utility model；
(1) figure is the top view that a kind of boiler SCR denitration system wherein one of the utility model sprays ammonia module in Fig. 3, (2) figure
It is (1) figure front view, (3) figure is the left view of (1) figure；
Fig. 4 is a kind of sampling detection structure X of boiler SCR denitration system of the utility model structural representation；
Fig. 5 is a kind of structural representation for the sampling detection structure X and ammonia-spraying grid for sampling detection structure X of the utility model
Figure.
Embodiment
To describe technology contents, construction feature, institute's reached purpose and effect of the utility model in detail, reality is hereby enumerated below
Apply example and coordinate accompanying drawing to be explained in detail.
Referring to shown in Fig. 1, and with reference to shown in Fig. 2-5, the utility model provides a kind of boiler SCR denitration system, including
One oxidation unit 1 is connected by the exhaust opening of a pipeline a and boiler and a desulfurizer 2 is filled by a pipeline b and the oxidation
Put 1 connection and a denitrification apparatus 3 to be connected with the desulfurizer 2 by pipeline c, the oxidation unit 1 includes filling dioxygen
One oxidation pond 11 of water 13 and the lid 12 for sealing the openend of oxidation pond 11, the tail end of the pipeline a pass through the lid
Body 12 is stretched into the hydrogen peroxide 13, and the head end of the pipeline b stretches into the oxidation pond 11, the desulfurization through the lid 12
Device 2 built with quick lime, the denitrification apparatus 3 from the direction of flow of flue gas be sequentially provided with a distributed matrix flowmeter 31,
One sampling detection structure X, an ammonia-spraying grid 32 and a SCR reactors 33 and a sampling detection structure Y, the distributed matrix
The input of flowmeter 31 and the sampling detection structure X and the sampling detection structure Y with a Flow Field Distribution controller 5
Communication connection, the output end of the ammonia-spraying grid 32 and the Flow Field Distribution controller 5 are communicated to connect, and the pipeline a is provided with
One air exhauster 4.
Because most nitrogen oxides exist in the form of NO in coal-fired flue-gas, currently generally acknowledged SCR denitration is reacted with NO
Based on catalytic reduction reaction, its chemical equation is as follows：
4NH3+4NO+O2→4N2+6H2O (1)
And reported according to domestic and international correlative study, and verified through laboratory experiment, when NO in flue gas being present2When, NO2It will replace
For O2, " FAST SCR " react, and its chemical equation is as follows for generation：
2NH3+NO+NO2→2N2+3H2O (2)
And the reaction rate of above-mentioned reaction (2) is compared with reaction (1) fast an order of magnitude.
And as the NO in flue gas2When/NO mol ratios are more than 1, unnecessary NO2" NO will occur2SCR " reacts, and it chemically reacts
Formula is as follows：
8NH3+6NO2→7N2+12H2O (3)
And the reaction rate of above-mentioned reaction (3) will be far below reaction (1).
So the air exhauster 4 being provided with by the pipeline a controls the flow velocity of flue gas in the pipeline a, simultaneously
Flue gas is controlled to be filled with the oxidation by controlling concentration and the total liquid volume of the hydrogen peroxide 13 in the oxidation unit 1
1 extent of reaction is put, quantitative oxidation NO can be realized substantially, make the NO in pipeline b2With NO content 1:1, so that reaction speed
Degree maximizes.
The hydrogen peroxide 13 can not only aoxidize NO, moreover it is possible to absorb the dust in the flue gas entered from pipeline a, prevent described
Dust blocks the SCR reactors 33 into the denitrification apparatus 3, reduces its service life.SO in flue gas simultaneously3Gas exists
It is removed in the hydrogen peroxide 13 because of dissolving.
Flue gas carries substantial amounts of steam in the pipeline b, SO in flue gas2With steam enter the desulfurizer 2 with it is described
Quick lime in desulfurizer 2 is removed because reacting generation calcium sulfate and/or calcium sulfite.Quick lime has simultaneously
Very strong water absorbing capacity can dry the flue gas by it.
The ammonia-spraying grid 32 has some spray ammonia modules 320 of rectangular distribution, and each spray ammonia module 320 includes
The main pipe 321 being connected with ammonia source 6, the end of the main pipe 321 connect with a connecting tube 322, the connecting tube 322 it is relative
Both ends respectively connect with a spray ammonia branch pipe 323, have some nozzles 324 towards the SCR reactors on each spray ammonia branch pipe 323
Direction where 33 is set.An electric control valve 325 is equipped with each main pipe 321.
Some nozzles 324 on the same spray ammonia branch pipe 323 be distributed in the spray ammonia branch pipe 323 with it is corresponding described
The opposite sides of the connectivity part of connecting tube 322, and wherein the quantity of the nozzle 324 of side is more than the spray of corresponding opposite side
The quantity of mouth 324.
The sampling detection structure X includes some sampling branch pipe x and corresponded with some spray ammonia modules 320, each
The suction nozzle 34 of the sampling branch pipe x ends is in the surface at the corresponding center of spray ammonia module 320.The Flow Field Distribution control
The input of device 5 processed has some input ports, and each sampling branch pipe x is corresponding with the Flow Field Distribution controller 5
An input port communication connection.
The sampling detection structure Y includes some sampling branch pipe y and corresponded with some spray ammonia modules, each described
The suction nozzle 34 for sampling branch pipe y ends is in the underface at the corresponding center of spray ammonia module 320.The Flow Field Distribution controller
5 input has some input ports, each sampling branch pipe y with corresponding one on the Flow Field Distribution controller 5
The input port communication connection.
Include the input of a data analysis module 51 and the Flow Field Distribution controller 5 in the Flow Field Distribution controller 5
End communication connection is used to analyze gas flow and gas concentration, and a data processing module 52 and the Flow Field Distribution controller 5
Output end communicate to connect for the data according to gas flow and gas concentration to send control command, the data analysis mould
Block 51 communicates to connect with the data processing module 52.
The data analysis module 51 is according to the distributed matrix flowmeter 31 and institute in the Flow Field Distribution controller 5
Sampling detection structure X and the sampling detection structure Y collections flue gas flow and the distribution situation of NOx concentration are stated, knows institute
The concentration with NOx in each 320 corresponding each sub-regions of spray ammonia module in denitrification apparatus 3 is stated, then passes through the number
Each electric control valve 325 of the ammonia-spraying grid 32 is acted on according to processing module 52, it is possible to achieve automatic appropriate reduction
The electric control valve 325 of the main pipe 321 at the spray ammonia module 320 corresponding to the relatively low region of NOx concentration is opened
Degree, the appropriate motorized adjustment for increasing the main pipe 321 corresponding to the higher region of NOx concentration at the spray ammonia module 320
The aperture of valve 325, make NOx by abundant reactive absorption, and avoid all adverse consequences caused by spraying ammonia inequality, simultaneously
It is effective to have evaded the secondary pollution excessively caused due to spray ammonia to air.
Compared with prior art, its advantage is the utility model：A kind of boiler SCR denitration system of the present utility model
System, the flue gas come out from boiler first pass through the hydrogen peroxide 13, and part NO therein is by hydrogen peroxide oxidation into NO2, then with water
The flue gas of vapour by the quick lime desulfurization in the desulfurizer 2 and de- partially acidic itrated compound, while dries cigarette by pipeline b
Gas, SO in flue gas3Taken off, NO and NO in pipeline c2NH into the denitrification apparatus 3 and the denitrification apparatus 33Institute
State reaction in SCR reactors 33 and generate harmless N2And H2O is discharged；And reported according to domestic and international correlative study, and it is real through laboratory
Checking, the NO present in the flue gas2When mol ratio with NO is 1, can occur in SCR reactors " FAST SCR " react,
The reaction speed be far longer than in flue gas only have NO reaction speed, and existing boiler emission come out most nitrogen oxides
NOxExist in the form of NO, so oxidation unit oxidized portion NO of the present utility model is allowed to become NO2, greatly improve described
The reaction speed of SCR reactors 33, being capable of the abundant denitration in the shorter time.The He of distributed matrix flowmeter 31 simultaneously
The input communication link of the sampling detection structure X and the sampling detection structure Y with the Flow Field Distribution controller 5
Connect, the output end of the ammonia-spraying grid 32 and the Flow Field Distribution controller 5 communicates to connect, so as to the Flow Field Distribution controller
5 can adopt according to the distributed matrix flowmeter 31 and the sampling detection structure X and the sampling detection structure Y
The gas flow and gas concentration data of collection control the spray ammonia flow and spray ammonia speed of the ammonia-spraying grid 32 in real time, effectively keep away
Exempt from because of the waste of ammonia and caused by secondary pollution.
In summary, the only preferred embodiment of the utility model, does not limit the scope of protection of the utility model with this, all
The equivalent changes and modifications made according to the utility model patent scope and description, it is all what the utility model patent covered
Within the scope of.
Claims (9)
- A kind of 1. boiler SCR denitration system, it is characterised in that：Pass through a pipeline a and the exhaust opening of boiler including an oxidation unit Connection and a desulfurizer are connected by a pipeline b with the oxidation unit and a denitrification apparatus is taken off by pipeline c with described Sulphur device connects, and the oxidation unit includes the oxidation pond for filling hydrogen peroxide and the lid for sealing the oxidation pond openend Body, the tail end of the pipeline a are stretched into the hydrogen peroxide through the lid, and the head end of the pipeline b is stretched through the lid Enter the oxidation pond, the desulfurizer is sequentially provided with one built with quick lime, the denitrification apparatus from the direction of flow of flue gas Distributed matrix flowmeter, a sampling detection structure X, an ammonia-spraying grid and a SCR reactors and a sampling detection structure Y, The distributed matrix flowmeter and the sampling detection structure X and the sampling detection structure Y with a Flow Field Distribution control The input communication connection of device processed, the output end of the ammonia-spraying grid and the Flow Field Distribution controller communicate to connect, the pipe Road a is provided with an air exhauster.
- A kind of 2. boiler SCR denitration system according to claim 1, it is characterised in that：It is in square that the ammonia-spraying grid, which has, Some spray ammonia modules of shape distribution, each spray ammonia module include main pipe be connected with ammonia source, the end of the main pipe and One connecting tube connects, and the opposite end of the connecting tube respectively connects with a spray ammonia branch pipe, if having on each spray ammonia branch pipe Direction where dry nozzle towards the SCR reactors is set.
- A kind of 3. boiler SCR denitration system according to claim 2, it is characterised in that：On the same spray ammonia branch pipe Some nozzles are distributed in opposite sides of the spray ammonia branch pipe with the corresponding connecting tube connectivity part, and the wherein institute of side State the nozzle quantity that nozzle quantity is more than corresponding opposite side.
- A kind of 4. boiler SCR denitration system according to claim 2, it is characterised in that：The sampling detection structure X includes Some sampling branch pipe x correspond with some spray ammonia modules, and the suction nozzle of each sampling branch pipe x ends is in corresponding The spray ammonia module centers surface.
- A kind of 5. boiler SCR denitration system according to claim 4, it is characterised in that：The Flow Field Distribution controller Input has some input ports, each sampling branch pipe x with corresponding one on the Flow Field Distribution controller described in Input port communicates to connect.
- A kind of 6. boiler SCR denitration system according to claim 2, it is characterised in that：The sampling detection structure Y includes Some sampling branch pipe y correspond with some spray ammonia modules, and the suction nozzle of each sampling branch pipe y ends is in corresponding The underface of the spray ammonia module centers.
- A kind of 7. boiler SCR denitration system according to claim 6, it is characterised in that：The Flow Field Distribution controller Input has some input ports, each sampling branch pipe y with corresponding one on the Flow Field Distribution controller described in Input port communicates to connect.
- A kind of 8. boiler SCR denitration system according to claim 2, it is characterised in that：It is equipped with each main pipe One electric control valve.
- A kind of 9. boiler SCR denitration system according to claim 1, it is characterised in that：In the Flow Field Distribution controller Input including a data analysis module and the Flow Field Distribution controller is communicated to connect for analyzing gas flow and gas Concentration, and the output end of a data processing module and the Flow Field Distribution controller are communicated to connect for gentle according to gas flow The data of bulk concentration send control command, and the data analysis module communicates to connect with the data processing module.
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| CN201720308809.XU CN206950948U (en) | 2017-03-28 | 2017-03-28 | A kind of boiler SCR denitration system |
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| CN201720308809.XU CN206950948U (en) | 2017-03-28 | 2017-03-28 | A kind of boiler SCR denitration system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106669396A (en) * | 2017-03-28 | 2017-05-17 | 武汉立为工程技术有限公司 | SCR denitration system for boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106669396A (en) * | 2017-03-28 | 2017-05-17 | 武汉立为工程技术有限公司 | SCR denitration system for boiler |
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