CN208372832U - A kind of reducing agent supply system for SCR denitration - Google Patents
A kind of reducing agent supply system for SCR denitration Download PDFInfo
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- CN208372832U CN208372832U CN201820612178.5U CN201820612178U CN208372832U CN 208372832 U CN208372832 U CN 208372832U CN 201820612178 U CN201820612178 U CN 201820612178U CN 208372832 U CN208372832 U CN 208372832U
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- supply system
- spray gun
- reducing agent
- ammonium hydroxide
- agent supply
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Abstract
The utility model provides a kind of reducing agent supply system for SCR denitration, the reducing agent supply system for SCR denitration includes: spray gun, the spray gun is arranged on the flue of connection house outlet and SCR reactor inlet, the ammonium hydroxide for the jet atomization into the flue；And the ammonium hydroxide feed system and compressed-air supply system of the connection spray gun.Reducing agent supply system provided by the utility model for SCR denitration directly heats the ammonium hydroxide after spray gun atomization using the hot fume of house outlet, traditional two processes of ammonia preparation and injection are combined into one, not only eliminate additional heating equipment, ammonia spraying equipment etc., keep technique simpler, and significantly reduces energy consumption.
Description
Technical field
The utility model relates to denitrating flue gas fields, supply system in particular to a kind of reducing agent for SCR denitration
System.
Background technique
With the worsening of ecological environment, one of the problem of being treated as extensive concern of rubbish.In waste incineration
Cheng Zhonghui, which is generated, contains HCl, SO2、NOxEtc. harmful substances flue gas, need to handle the flue gas, can be arranged after up to standard
It puts.
Selective catalytic reduction (Selective Catalytic Reduction, SCR) denitration technology is in catalyst
Under the conditions of existing, so that NOxWith reducing agent NH3A kind of technology that can be reacted under low temperature (150-400 DEG C).It is common
Reactant include liquefied ammonia, ammonium hydroxide and urea.Since above-mentioned reactant is liquid or solid-state, needed before entering reaction module
It is gasified in advance, more rapid and better to be mixed with flue gas, and prevents drop from damaging to reactor and catalyst.
In above-mentioned three kinds of reactants, it is minimum that liquefied ammonia prepares ammonia cost, but liquefied ammonia belongs to the product of being in extreme danger, and safety is difficult
To ensure, especially use in metropolitan district；For urea ammonia mode although comparatively safe, preparation cost is excessively high；It is comprehensive and
Speech, ammonium hydroxide compare suitable for waste incineration SCR denitration.However, there are system complex, occupied area for currently used ammonia still
Greatly, the disadvantages of waste water handling problem；Ammonium hydroxide evaporation tank systems effectively prevent the above problem, but need to provide additional heat
Source, it is not energy saving enough, in addition, the technical process for being prepared into injection from ammonia is complex, it is difficult to control.
Therefore, it is necessary to a kind of new reducing agent supply system for SCR denitration be proposed, to solve the above problems.
Utility model content
A series of concept of reduced forms is introduced in utility model content part, this will be in specific embodiment part
Middle further description.The utility model content part of the utility model is not meant to attempt to limit claimed
Technical solution key feature and essential features, do not mean that the guarantor for attempting to determine technical solution claimed more
Protect range.
In order at least be partially solved the above problem, the utility model discloses a kind of reducing agent confessions for SCR denitration
To system, the reducing agent supply system for SCR denitration includes: spray gun, and the spray gun setting is in connection house outlet
Ammonium hydroxide on the flue of SCR reactor inlet, for from the jet atomization to the flue；And the ammonium hydroxide of the connection spray gun
Feed system and compressed-air supply system.
Illustratively, the reducing agent supply system further includes being arranged vertically in the flue in the spray gun downstream
Mixed plate, the mixed plate include and the consistent baffle of the number of the spray gun, the nozzle location of the baffle and the spray gun
It is corresponding.
Illustratively, the baffle is fixedly connected by support frame.
Illustratively, the shape of the baffle is circle.
Illustratively, the number of the spray gun is no less than three, and the spray gun is uniform on the sustained height of the flue
Arrangement.
Illustratively, when the section of the flue is rectangular, the number of the spray gun is four；When cutting for the flue
When face is round, the number of the spray gun is three.
Illustratively, ammonium hydroxide of the spray gun relative to atomization described in the hot fume upstream injection in the flue.
Illustratively, the nozzle of the spray gun is 45 ° -60 ° to the spray angle of the ammonium hydroxide of the atomization.
Illustratively, the atomizing particle size of the ammonium hydroxide is 100 μm or less.
Illustratively, the ammonium hydroxide feed system includes sequentially connected tank used for storing ammonia, ammonium hydroxide delivery pump and ammonium hydroxide point
With unit, the compressed-air supply system includes sequentially connected compressed air source and compressed air allocation unit.
Reducing agent supply system provided by the utility model for SCR denitration is straight using the hot fume of house outlet
Traditional ammonia is prepared and two processes of injection is combined into one, not only eliminated additional by the ammonium hydroxide after connecing heat gun atomization
Heating equipment, ammonia spraying equipment etc., keep technique simpler, and significantly reduce energy consumption.
Detailed description of the invention
The following drawings of the utility model is used to understand the utility model in this as a part of the utility model.Attached drawing
In show the embodiments of the present invention and its description, for explaining the principles of the present invention.
In attached drawing:
Fig. 1 shows the structure of the reducing agent supply system for SCR denitration according to one embodiment of the utility model
Schematic diagram.
Fig. 2 shows according to the spray in the reducing agent supply system for SCR denitration of one embodiment of the utility model
Rifle arrangement schematic diagram.
Fig. 3 shows mixed in the reducing agent supply system for SCR denitration according to one embodiment of the utility model
The structural schematic diagram of plywood.
Specific embodiment
In the following description, a large amount of concrete details are given more thoroughly to manage in order to provide to the utility model
Solution.It is, however, obvious to a person skilled in the art that the utility model may not need it is one or more of these thin
It saves and is carried out.In other examples, in order to avoid obscuring with the utility model, for more well known in the art
Technical characteristic is not described.
In order to thoroughly understand the utility model, detailed step will be proposed in following description, it is practical to illustrate
The reducing agent supply system for SCR denitration of novel proposition.Obviously, the execution of the utility model is not limited to this field
The specific details that technical staff is familiar with.The preferred embodiment of the utility model is described in detail as follows, however in detail in addition to these
Description is outer, and the utility model can also have other embodiments.
It should be understood that when the term " comprising " and/or " including " is used in this specification, indicating described in presence
Feature, entirety, step, operation, element and/or component, but do not preclude the presence or addition of other one or more features, entirety,
Step, operation, element, component and/or their combination.
Selective catalytic reduction (Selective Catalytic Reduction, SCR) denitration technology is in catalyst
Under the conditions of existing, so that NOxWith reducing agent NH3A kind of technology that can be reacted under low temperature (150-400 DEG C).It is common
Reactant include liquefied ammonia, ammonium hydroxide and urea.Since above-mentioned reactant is liquid or solid-state, needed before entering reaction module
It is gasified in advance, more rapid and better to be mixed with flue gas, and prevents drop from damaging to reactor and catalyst.
For different types of reducing agent, used by ammonia mode processed it is also different.It is general to use for weak aqua ammonia
Ammonia still produces ammonia, using thermophore water vapour as heating agent, the equilibrium vapour pressure for recycling ammonia in water level is made to be greater than heat
The partial pressure of ammonia in carrier, gas-liquid two-phase counter current contacting carry out mass-and heat-transfer, so that ammonia be made gradually to release from recirculated water
Come, obtains the mixture of ammonia steam and water vapour in tower top, obtain purer recirculated water in tower bottom.In addition, there are also use ammonia
Evaporator tank is ammonium hydroxide evaporation equipment, mainly hot-air or hot fume is obtained by steam heating or electric heating, into evaporator tank
In with atomizing lance spray into ammonium hydroxide mix, ammonium hydroxide be heated is evaporated to dilution ammonia.For urea, using hydrolysis or pyrolysis side
Formula.For liquefied ammonia, ammonia is generally flashed to using heat evaporating device, is used in coal-burning power plant more.Above-mentioned several ammonia processed
The ammonia gas mixture that mode generates needs to pass through again in the flue before ammonia-spraying grid is sprayed into SCR reactor.
In above-mentioned three kinds of reactants, it is minimum that liquefied ammonia prepares ammonia cost, but liquefied ammonia belongs to the product of being in extreme danger, and safety is difficult
To ensure, especially use in metropolitan district；For urea ammonia mode although comparatively safe, preparation cost is excessively high；It is comprehensive and
Speech, ammonium hydroxide compare suitable for waste incineration SCR denitration.However, there are system complex, occupied area for currently used ammonia still
Greatly, the disadvantages of waste water handling problem；Ammonium hydroxide evaporation tank systems effectively prevent the above problem, but need to provide additional heat
Source, it is not energy saving enough, in addition, the technical process for being prepared into injection from ammonia is complex, it is difficult to control.
For at least one above-mentioned problem, the utility model provides a kind of reducing agent supply system for SCR denitration,
The reducing agent supply system includes: spray gun, and the flue of connection house outlet and SCR reactor inlet is arranged in the spray gun
On, the ammonium hydroxide for the jet atomization into the flue；And the ammonium hydroxide feed system and compressed air of the connection spray gun supply
To system.
Reducing agent supply system provided by the utility model for SCR denitration is straight using the hot fume of house outlet
Traditional ammonia is prepared and two processes of injection is combined into one, not only eliminated additional by the ammonium hydroxide after connecing heat gun atomization
Heating equipment, ammonia spraying equipment etc., keep technique simpler, and significantly reduce energy consumption.
System is supplied below with reference to the reducing agent for SCR denitration of Fig. 1, Fig. 2 and Fig. 3 to one embodiment of the utility model
System is described in detail.
As shown in Figure 1, reducing agent supply system provided by the present embodiment includes spray gun 105, the setting of spray gun 105 exists
On the flue 106 for connecting house outlet and 101 entrance of SCR reactor, the ammonia for the jet atomization into the flue 106
Water；The spray gun 105 is connected with ammonium hydroxide feed system and compressed-air supply system.The reducing agent supply system directly passes through
Spray gun 105 sprays into the ammonia spirit of atomization in the flue 106 between house outlet and 101 entrance of SCR reactor, utilizes cigarette
Traditional ammonia is prepared to generate ammonia and two processes of injection closes two by the heat direct gasification ammonium hydroxide of hot fume in road 106
It is one, not only eliminates additional heating equipment, ammonia spraying equipment etc., keep technique simpler, and significantly reduce energy
Consumption.
Wherein, the ammonium hydroxide feed system supplies ammonium hydroxide to the spray gun 105, and the compressed-air supply system is to described
Spray gun 105 supplies compressed air, and the ammonium hydroxide into spray gun 105 is atomized the ammonium hydroxide for atomization under the action of compressed air.Example
Property, the ammonium hydroxide feed system includes sequentially connected tank used for storing ammonia 102, ammonium hydroxide delivery pump 103 and ammonium hydroxide allocation unit
104, the compressed-air supply system includes sequentially connected compressed air source and compressed air allocation unit 107.The pressure
Contracting air-source can be the station-service compressed air from station-service compressed air line.Certain density ammonia spirit is conveyed through ammonium hydroxide
Pump 103 is delivered to ammonium hydroxide allocation unit 104 from tank used for storing ammonia 102, passes through the metering control tune in ammonium hydroxide allocation unit 104
Ammonium hydroxide is sent into the ammonium hydroxide interface of spray gun 105, compressed air is delivered to through compressed air allocation unit 107 after amount of restriction and pressure
The compressed air interface of spray gun 105, the ammonium hydroxide into spray gun 105 are atomized under the action of compressed air, and with carry out Self-duster
The hot fume of outlet sprays into flue 106 in countercurrent direction.The ammonium hydroxide droplet that atomization generates absorbs the heat of flue gas in flue 106
Amount, gasification is ammonia and water vapour rapidly, and is mixed into certain density ammonia/flue gas gaseous mixture with flue gas, and it is anti-to enter back into SCR
Device 101 is answered to carry out denitration reaction.
In one embodiment, the ammonium hydroxide that spray gun 105 is atomized relative to hot fume upstream injection, to effectively extend ammonia
The incorporation time of water and hot fume has better ammonium hydroxide/hot fume mixed effect.It illustratively, can also be by controlling ammonium hydroxide
The preferred equal measures of solution concentration and compressed air pressure and spray gun, make the atomizing particle size of ammonium hydroxide at 100 μm hereinafter, spray gun
The jet angle of 105 nozzle is 45 ° -60 °.Reasonable lance ejection angle and atomizing particle size are capable of increasing ammonium hydroxide drop and flue gas
Contact area, to guarantee that ammonium hydroxide sprays into Quick-gasifying after flue 106.
The number of the spray gun 105 is no less than three, also, the spray gun 105 is uniform on the sustained height of flue 106
Distribution, equally distributed arrangement keep the ammonium hydroxide ejected distribution more uniform.Illustratively, when the cross section of flue 106
When being rectangular, it is evenly arranged on the sustained height of the flue 106 there are four spray gun 105；The cross section of flue 106 is circle
When, it is evenly arranged on the sustained height of the flue 106 there are three spray gun.As an example, in the present embodiment, it is described uniformly to divide
Cloth refers to that the central axis for being positioned around flue 106 of the nozzle of each spray gun 105 is equidistantly positioned.Fig. 2 is transversal when flue 106
When face is rectangular, arrangement schematic diagram of the spray gun 105 on flue 106.
After being heated due to atomized drop, ammonia is quickly evaporated than water vapour, and the ammonia on the section of air-flow is caused easily to collect
In at the nozzle location, ammonia and flue gas mixing are uneven, therefore in the present embodiment, in 105 downstream of spray gun, one spacing
Mixed plate 108 is disposed with perpendicular to flue 106 in flue 106 from place.When the section of flue 106 is rectangular, it is applicable in
The structural schematic diagram of mixed plate 108 is as shown in Figure 3.Mixed plate 108 includes mainly circle corresponding with the nozzle location of spray gun 105
Shape baffle 108a (by taking the number of spray gun 105 is four as an example), circular baffle plate 108a is fixedly connected by support frame 108b.Work as gas
Stream can stream when flowing near circular baffle plate 108a, mix to play the role of reinforcement ammonia with hot fume.
Reducing agent supply system provided by the utility model for SCR denitration has the advantages that
1, the ammonium hydroxide after spray gun atomization is directly heated using the hot fume of house outlet, traditional ammonia is prepared and sprayed
It penetrates two processes to be combined into one, not only eliminates additional heating equipment, ammonia spraying equipment etc., keep technique simpler, and
And significantly reduce energy consumption；
2, the flexible arrangement of spray gun, the mode being evenly arranged keep the ammonium hydroxide ejected distribution more uniform；
3, spray gun counter-flow arrangement can effectively extend the incorporation time of ammonium hydroxide and hot fume, have better ammonium hydroxide/hot fume
Mixed effect；
4, reasonable lance ejection angle and tiny atomizing particle size increase the contact area of ammonium hydroxide drop and hot fume, from
And guarantee the Quick-gasifying of ammonium hydroxide；
5, distinctive mixed plate design structure is simple, ammonia can be made to be more fully mixed with flue gas, is conducive to improve subsequent
The efficiency of SCR denitration reaction.
In conclusion reducing agent supply system provided by the present invention is simple and efficient, takes up little area, cost is relatively low, operation peace
It is complete reliable, it is suitable for burning power plant.
Unless otherwise defined, the technology of technical and scientific term used herein and the technical field of the utility model
The normally understood meaning of personnel is identical.Term used herein is intended merely to describe specifically to implement purpose, it is not intended that limit
The utility model processed.Terms such as herein presented " settings " can both indicate that a component was attached directly to another portion
Part can also indicate that a component is attached to another component by middleware.The spy described in one embodiment herein
Sign can be applied in combination another embodiment individually or with other feature, unless this feature is in another embodiment
It is not suitable for or is otherwise noted.
The utility model is illustrated through the foregoing embodiment, but it is to be understood that, above-described embodiment is
Purpose for illustrating and illustrating, and be not intended to limit the invention within the scope of described embodiment.Furthermore ability
Field technique personnel are it is understood that the utility model is not limited to above-described embodiment, and introduction according to the present utility model is also
More kinds of variants and modifications can be made, these variants and modifications all fall within the utility model range claimed with
It is interior.The protection scope of the utility model is defined by the appended claims and their equivalents.
Claims (10)
1. a kind of reducing agent supply system for SCR denitration, which is characterized in that the reducing agent supply system includes:
Spray gun, the spray gun are arranged on the flue of connection house outlet and SCR reactor inlet, for into the flue
The ammonium hydroxide of jet atomization；And
Connect the ammonium hydroxide feed system and compressed-air supply system of the spray gun.
2. the reducing agent supply system according to claim 1 for SCR denitration, which is characterized in that further include vertical cloth
The mixed plate in the flue in the spray gun downstream is set, the mixed plate includes and the consistent gear of the number of the spray gun
Plate, the baffle are corresponding with the nozzle location of the spray gun.
3. the reducing agent supply system according to claim 2 for SCR denitration, which is characterized in that the baffle passes through
Support frame is fixedly connected.
4. the reducing agent supply system according to claim 2 for SCR denitration, which is characterized in that the shape of the baffle
Shape is circle.
5. the reducing agent supply system according to claim 1 for SCR denitration, which is characterized in that the number of the spray gun
Mesh is no less than three, and the spray gun is evenly arranged on the sustained height of the flue.
6. the reducing agent supply system according to claim 5 for SCR denitration, which is characterized in that when the flue
When section is rectangular, the number of the spray gun is four；When the section of the flue is round, the number of the spray gun is three
It is a.
7. the reducing agent supply system according to claim 1 for SCR denitration, which is characterized in that the spray gun is opposite
The ammonium hydroxide of atomization described in hot fume upstream injection in the flue.
8. the reducing agent supply system according to claim 1 for SCR denitration, which is characterized in that the spray of the spray gun
Mouth is 45 ° -60 ° to the spray angle of the ammonium hydroxide of the atomization.
9. the reducing agent supply system according to claim 1 for SCR denitration, which is characterized in that the mist of the ammonium hydroxide
Changing partial size is 100 μm or less.
10. the reducing agent supply system according to claim 1 for SCR denitration, which is characterized in that the ammonium hydroxide supply
System includes sequentially connected tank used for storing ammonia, ammonium hydroxide delivery pump and ammonium hydroxide allocation unit, the compressed-air supply system packet
Include sequentially connected compressed air source and compressed air allocation unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820612178.5U CN208372832U (en) | 2018-04-25 | 2018-04-25 | A kind of reducing agent supply system for SCR denitration |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820612178.5U CN208372832U (en) | 2018-04-25 | 2018-04-25 | A kind of reducing agent supply system for SCR denitration |
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| CN208372832U true CN208372832U (en) | 2019-01-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI720730B (en) * | 2019-01-30 | 2021-03-01 | 日商三菱動力股份有限公司 | Reducing agent supply device and denitration device |
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2018
- 2018-04-25 CN CN201820612178.5U patent/CN208372832U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI720730B (en) * | 2019-01-30 | 2021-03-01 | 日商三菱動力股份有限公司 | Reducing agent supply device and denitration device |
| US11583803B2 (en) | 2019-01-30 | 2023-02-21 | Mitsubishi Heavy Industries, Ltd. | Reducing agent supply device and denitration device |
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