CN206631410U - A kind of flue gas denitrification system with uniform ammonia-gas spraying device for boiler - Google Patents
A kind of flue gas denitrification system with uniform ammonia-gas spraying device for boiler Download PDFInfo
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- CN206631410U CN206631410U CN201720333608.5U CN201720333608U CN206631410U CN 206631410 U CN206631410 U CN 206631410U CN 201720333608 U CN201720333608 U CN 201720333608U CN 206631410 U CN206631410 U CN 206631410U
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- boiler
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- ammonia
- flue
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Abstract
The utility model provides a kind of flue gas denitrification system with uniform ammonia-gas spraying device for boiler, including, reducing agent injector and it is arranged at SCR reactors in boiler back end ductwork；Uniform ammonia-gas spraying device, it is arranged in the boiler back end ductwork before the SCR reactors；Bypass flue, its entrance is located at before the gas injection apparatus, and is connected with the boiler back end ductwork, and it, which is exported, connects the gas injection apparatus, and the reducing agent injector is arranged in the bypass flue.The utility model is simple in construction, is only achieved that reducing agent uniformly mixes with flue gas by gas injection apparatus and bypass flue, and the volume of equipment is reduced while ensureing that reducing agent is well mixed with flue gas.
Description
Technical field
It the utility model is related to denitration technology field, and in particular to a kind of cigarette with uniform ammonia-gas spraying device for boiler
Gas denitrating system.
Background technology
All contain nitrogen oxides (NO in the flue gas of blast furnace or boilerx), and nitrogen oxides is one kind can cause atmospheric environment
The gas seriously polluted, it can form photochemical fog or acid rain etc. in an atmosphere, the health and property of people all can
Cause greatly to endanger.Nitrogen oxides mainly uses SCR technology (SCR) in removing boiler smoke at present, i.e., sharp
With the NO in reducing agent and flue gasxReaction, the nitrogen and water of nontoxic pollution-free are generated, to reach the purpose of denitration environmental protection.SCR skills
Needed in art after first ammonia is mixed with flue gas, be re-fed into SCR reactors, currently used reducing agent injector injection reduction
Agent, reducing agent mix with flue gas, and using the heat generation ammonia of flue gas, then remove NO into SCR reactorsx, but on
Technique is stated because the time of contact of ammonia and flue gas is short, frequently can lead to ammonia mixed with flue gas it is uneven, it is follow-up so as to influence
Remove NOxEffect.
A kind of systems of removing nitric oxide from boiler flue gas of Chinese patent CN202021014U, including going back outside boiler
Former agent solution preparation system, the SNCR reductant solutions supply being connected with reductant solution preparation system and control device；It is located at
SNCR reductant solution injector groups at boiler furnace outlet, SNCR reductant solution injector groups and SNCR reductant solutions
Supply and control device are connected by SNCR reductant solutions pipeline；SCR reactors in boiler back end ductwork, SCR are anti-
Answer and SCR catalyst is loaded with device；The SCR reducing agents outside boiler for also including being connected with reductant solution preparation system are molten
Liquid supplies and control device, the SCR reductant solution injector groups in boiler reversal chamber, SCR reductant solution injectors
Group is connected with the supply of SCR reductant solutions and control device by SCR reductant solution pipelines, wherein, the spray of SCR reductant solutions
Economizer, static mixer, smoke deflector, flow straightening grid are sequentially provided with flue between emitter group and SCR reactors.
Above-mentioned technology is by setting SNCR reductant solution injector groups and SCR reductant solution injector groups to realize reducing agent and cigarette
The mixing of gas, and the mixing of ammonia and flue gas is realized by static mixer, smoke deflector, flow straightening grid, although above-mentioned skill
It is uneven that art solves the problems, such as that ammonia mixes with flue gas, but uses two groups of injectors, adds the dosage of reducing agent, significantly
The cost for adding technique, and static mixer, smoke deflector, flow straightening grid not only increase the cost of equipment, and
And also increase the volume of equipment.
Utility model content
Therefore, the technical problems to be solved in the utility model of the prior art is mixing ammonia in overcoming in SCR technology
The defects of equipment complexity cost of gas or reducing agent and flue gas is high, a kind of there is uniform ammonia-gas spraying device for boiler so as to provide
Flue gas denitrification system.
A kind of flue gas denitrification system with uniform ammonia-gas spraying device for boiler, including, reducing agent injector and setting
In SCR reactors in boiler back end ductwork；Also include,
Uniform ammonia-gas spraying device, it is arranged in the boiler back end ductwork before the SCR reactors；
Bypass flue, its entrance are connected before the uniformly ammonia-gas spraying device with the boiler back end ductwork, its
Outlet connects the uniform ammonia-gas spraying device, and the reducing agent injector is arranged in the bypass flue.
Preferably, in the described flue gas denitrification system with uniform ammonia-gas spraying device for boiler, the uniformly spray
Ammonia device includes some injection units, and the injection unit includes an at least playpipe.
Preferably, in the described flue gas denitrification system with uniform ammonia-gas spraying device for boiler, the injection is single
Member includes some playpipes being coaxially disposed, and some playpipes are arranged to form the injection unit, the spray from outside to inside
Penetrating the length of pipe gradually increases, and has space between adjacent playpipe；
Wherein, connected between adjacent playpipe by metallic plate.
Preferably, in the described flue gas denitrification system with uniform ammonia-gas spraying device for boiler,
The bypass flue is provided with control valve closing at its entrance and exit.
Preferably, in the described flue gas denitrification system with uniform ammonia-gas spraying device for boiler, the bypass cigarette
Road is provided with expansion joint.
Preferably, in the described flue gas denitrification system with uniform ammonia-gas spraying device for boiler, the reducing agent
Injector is also associated with reductant metering distributor.
Preferably, in the described flue gas denitrification system with uniform ammonia-gas spraying device for boiler,
The uniformly ammonia-gas spraying device includes some gas injection groups, and the injection group includes some injection lists be arrangeding in parallel
Member, shape is in an acute angle between adjacent gas injection group.
Preferably, in the described flue gas denitrification system with uniform ammonia-gas spraying device for boiler,
The uniformly ammonia-gas spraying device also includes supervisor, and the supervisor is arranged in the boiler back end ductwork, with the pot
The bottom of stove back-end ductwork be arranged in parallel；
The supervisor is connected with the outlet of the bypass flue, and some gas injection groups connect with the supervisor；
Wherein, the injection unit and the angle of supervisor are 90-270 °.
Preferably, in the described flue gas denitrification system with uniform ammonia-gas spraying device for boiler, along boiler smoke
Flow direction, be disposed with superheater, economizer and the SCR reactors, the bypass on the boiler back end ductwork
The entrance of flue is between the superheater and the economizer, after the uniform ammonia-gas spraying device is located at the economizer
Side.
Preferably, in the described flue gas denitrification system with uniform ammonia-gas spraying device for boiler, the bypass cigarette
Road porch is provided with grieshoch baffle plate.
Uniform ammonia-gas spraying device described in the utility model can be used for boiler bypass flue gas denitrification system, can also replace conventional
Ammonia-spraying grid device is used in conventional scr denitrating system, and any need is by the uniform system of at least two gas mixings.
Technical solutions of the utility model, have the following advantages that：
1. a kind of flue gas denitrification system with uniform ammonia-gas spraying device for boiler provided by the utility model, including also
Former agent injector and it is arranged at SCR reactors in the boiler back end ductwork；Uniform ammonia-gas spraying device, it is arranged at the SCR reactions
In boiler back end ductwork before device；Bypass flue, its entrance positioned at described uniformly before ammonia-gas spraying device, and with the boiler tail
Portion's flue is connected, and it, which is exported, connects the uniform ammonia-gas spraying device, and the reducing agent injector is arranged in the bypass flue；
Uniform ammonia-gas spraying device is connected with bypass flue, after making partial fume and first being mixed with reducing agent, then mixed with remainder flue gas
Close, not only avoid in mixed once due to mixing it is large-minded caused by mixing it is uneven the problem of, and extend reduction
Agent and the incorporation time of flue gas, the well mixed effect further functioned as；The utility model is simple in construction, only by uniformly spraying
Ammonia device and bypass flue are achieved that reducing agent uniformly mixes with flue gas, while ensureing that reducing agent is well mixed with flue gas
Reduce the volume of equipment.
2. a kind of flue gas denitrification system with uniform ammonia-gas spraying device for boiler provided by the utility model, emphasis exist
Including some playpipes being coaxially disposed in the injection unit, some playpipes are arranged to form the injection unit, from
The length of the playpipe gradually increases outside to inside, has space between adjacent playpipe；Gas leads to from the space between playpipe
Cross, increase flow perturbation makes gas mixing more uniform.
Brief description of the drawings
, below will be right in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
The required accompanying drawing used is briefly described in embodiment or description of the prior art, it should be apparent that, describe below
In accompanying drawing be some embodiments of the present utility model, for those of ordinary skill in the art, do not paying creativeness
On the premise of work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is sectional view of the present utility model；
Fig. 2 is the structural representation of injection unit described in the utility model；
Fig. 3 is the structural representation of uniformly ammonia-gas spraying device described in the utility model；
Fig. 4 is the top view of injection unit described in the utility model.
Description of reference numerals：
1- boiler back end ductworks；2- superheaters；3- economizers；
4- bypass flues；The uniform ammonia-gas spraying devices of 5-；6-SCR reactors；
7- reducing agent injectors；8- control valves；9- expansion joints；
10- grieshoch baffle plates；11- reductant metering distributors；51- injection units；
52- is responsible for；511- playpipes；512- playpipes；
513- playpipes；514- metallic plates；
Embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with accompanying drawing, it is clear that described
Embodiment is the utility model part of the embodiment, rather than whole embodiments.Based on the embodiment in the utility model, sheet
The every other embodiment that field those of ordinary skill is obtained under the premise of creative work is not made, belongs to this practicality
Novel protected scope.
, it is necessary to explanation in description of the present utility model, term " " center ", " on ", " under ", it is "left", "right", " perpendicular
Directly ", the orientation of the instruction such as " level ", " interior ", " outer " or position relationship are based on orientation shown in the drawings or position relationship, are only
Described for the ease of description the utility model and simplifying, rather than instruction or imply signified device or element must have it is specific
Orientation, with specific azimuth configuration and operation, therefore it is not intended that to limitation of the present utility model.In addition, term " the
One ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that instruction or hint relative importance.
, it is necessary to which explanation, unless otherwise clearly defined and limited, term " are pacified in description of the present utility model
Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integratedly
Connection；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary,
It can be the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
Concrete meaning of the language in the utility model.
In addition, as long as technical characteristic involved in the utility model different embodiments disclosed below is each other
Conflict can is not formed to be combined with each other.
Embodiment
As shown in figure 1, a kind of flue gas denitrification system with uniform ammonia-gas spraying device for boiler, including：Reducing agent sprays
Emitter 7 and the SCR reactors 6 being arranged in boiler back end ductwork 1；Uniform ammonia-gas spraying device 5, be arranged at the SCR reactors 6 it
In preceding boiler back end ductwork 1；Bypass flue 4, its entrance positioned at described uniformly before ammonia-gas spraying device 5, and with the boiler tail
Portion's flue 4 is connected, and it exports connection uniformly ammonia-gas spraying device 5, the reducing agent injector 7 and is arranged at the bypass flue
In 4.
After boiler tail flue gas part enters bypass flue, with reducing agent or ammonia with contacting, after forming preliminary gaseous mixture,
Into uniform ammonia-gas spraying device, sprayed by uniform ammonia-gas spraying device, mixed with the flue gas of remainder；Using reducing agent or ammonia and cigarette
Qi leel step mixing, flue gas and reducing agent are avoided or during ammonia disposably mixes, because the large-minded of flue gas, flow velocity are caused soon
The problem of uneven is mixed, and extends the incorporation time of reducing agent or ammonia and flue gas, what is further functioned as is well mixed
Effect.
Further, as illustrated in fig. 1 and 2, the uniformly ammonia-gas spraying device 5 includes some injection units 51, and the injection is single
Member 51 includes an at least playpipe.
Further, the injection unit 51 includes some playpipes being coaxially disposed, and several described playpipes are arranged
Form the injection unit 51, in the present embodiment so that three playpipes are arranged as an example, but the utility model is not limited to three sprays
Pipe is penetrated, as shown in Fig. 2 three playpipes 511,512,513 are arranged to form the injection unit 51, it is described from outside to inside
The length of playpipe gradually increases, and has space between adjacent playpipe；
Connected between adjacent playpipe by metallic plate 514；In the present embodiment, as shown in figure 4, playpipe 511 passes through 4
Block metallic plate (steel plate) 514 is fixedly connected with playpipe 512, and playpipe 512 passes through 4 pieces of metallic plates (steel plate) and playpipe 513
It is fixedly connected.
Mixed gas between playpipe and playpipe in space spray so that gas is between playpipe and playpipe
In space in collide, realize the disturbance of gas, further reached the uniform effect of gas mixing, simultaneously because from outside to inside
The length of the playpipe gradually increases, and extends gas circuit, so that gas is further well mixed.
Further, as shown in figure 3, the uniformly ammonia-gas spraying device 5 includes some gas injection groups, any injection group includes
Some injection units 51 be arrangeding in parallel, shape is in an acute angle between adjacent gas injection group.
Further, as shown in figure 3, the uniformly ammonia-gas spraying device 5 also includes supervisor 52, the supervisor 52 is arranged on described
In boiler back end ductwork 1, it is be arranged in parallel with the bottom of the boiler back end ductwork 1；The supervisor 52 and the bypass flue 4
Outlet connection, some gas injection groups connect with the supervisor 52；Wherein, the injection unit 51 and the angle of supervisor 52
For 90-270 °.
Further, the bypass flue 4 is provided with control valve 8 closing at its entrance and exit.
Further, the bypass flue 4 is provided with expansion joint 9.
Further, the reducing agent injector 7 is also associated with reductant metering distributor 11.
Further, along the flow direction of boiler smoke, superheater 2 is disposed with the boiler back end ductwork 1, is saved
Coal device 3 and the SCR reactors 6, the entrance of the bypass flue 4 are described equal between superheater 2 and the economizer 3
Even ammonia-gas spraying device 5 is located at the rear of the economizer 3.
Further, the porch of bypass flue 4 is provided with grieshoch baffle plate 10.
Operation principle of the present utility model is：
After boiler smoke is entered by the air inlet of boiler back end ductwork, after superheater, partial fume enters bypass cigarette
Road, partial fume by economizer, into bypass flue flue gas mixed with the reducing agent that reducing agent injector sprays after, enter
Uniform ammonia-gas spraying device, by being sprayed between multiple playpipes and playpipe in space, after being mixed by the flue gas of economizer, enter
Enter SCR reactor denitrations.
In the application of reality, first according to different boiler types and uniformly spray ammonia before the whole uniformly ammonia-gas spraying device of manufacture
The flue size of device position, by CFD smoothnesses simulate that uniform ammonia-gas spraying device sprays be mixed with reducing agent or
Coverage condition of the flue gas of ammonia in flue, select injection unit and the angular dimension of the center of circle formation of supervisor.
Obviously, above-described embodiment is only intended to clearly illustrate example, and is not the restriction to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or
Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or
Among the protection domain that variation is created still in the utility model.
Claims (10)
1. a kind of flue gas denitrification system with uniform ammonia-gas spraying device for boiler, including, reducing agent injector (7) and setting
In the interior SCR reactors (6) of boiler back end ductwork (1)；
Characterized in that, also include,
Uniform ammonia-gas spraying device (5), the boiler back end ductwork (1) before being arranged at the SCR reactors (6) are interior；
Bypass flue (4), its entrance are connected before the uniformly ammonia-gas spraying device (5) with the boiler back end ductwork (1)
Logical, it exports the connection uniformly ammonia-gas spraying device (5), and the reducing agent injector (7) is arranged in the bypass flue (4).
2. the flue gas denitrification system with uniform ammonia-gas spraying device according to claim 1 for boiler, it is characterised in that
The uniformly ammonia-gas spraying device (5) includes some injection units (51), and the injection unit (51) includes an at least playpipe.
3. the flue gas denitrification system with uniform ammonia-gas spraying device according to claim 2 for boiler, it is characterised in that
The injection unit (51) includes some playpipes being coaxially disposed, and some playpipes are arranged to form the injection unit
(51), the length of the playpipe gradually increases from outside to inside, has space between adjacent playpipe；
Wherein, connected between adjacent playpipe by metallic plate (514).
4. according to any described flue gas denitrification systems with uniform ammonia-gas spraying device for boiler of claim 1-3, it is special
Sign is,
The bypass flue (4) is provided with control valve (8) closing at its entrance and exit.
5. the flue gas denitrification system with uniform ammonia-gas spraying device according to claim 4 for boiler, it is characterised in that
The bypass flue (4) is provided with expansion joint (9).
6. the flue gas denitrification system with uniform ammonia-gas spraying device according to claim 5 for boiler, it is characterised in that
The reducing agent injector (7) is also associated with reductant metering distributor (11).
7. the flue gas denitrification system with uniform ammonia-gas spraying device for boiler according to claim 5 or 6, its feature exist
In,
The uniformly ammonia-gas spraying device (5) includes some gas injection groups, and the injection group includes some injection lists be arrangeding in parallel
First (51), shape is in an acute angle between adjacent gas injection group.
8. the flue gas denitrification system with uniform ammonia-gas spraying device according to claim 7 for boiler, it is characterised in that
The uniformly ammonia-gas spraying device (5) also includes supervisor (52), and the supervisor (52) is arranged on the boiler back end ductwork (1)
In, it is be arranged in parallel with the bottom of the boiler back end ductwork (1)；
The supervisor is connected with the outlet of the bypass flue (4), and some gas injection groups connect with the supervisor (52)；
Wherein, the injection unit (51) and the angle of supervisor (52) are 90-270 °.
9. the flue gas denitrification system with uniform ammonia-gas spraying device according to claim 8 for boiler, it is characterised in that
Along the flow direction of boiler smoke, superheater (2), economizer (3) and described are disposed with the boiler back end ductwork (1)
SCR reactors (6), the entrance of the bypass flue (4) are described equal between the superheater (2) and the economizer (3)
Even ammonia-gas spraying device (5) is located at the rear of the economizer (3).
10. the flue gas denitrification system with uniform ammonia-gas spraying device according to claim 1 for boiler, its feature exists
In bypass flue (4) porch is provided with grieshoch baffle plate (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720333608.5U CN206631410U (en) | 2017-03-31 | 2017-03-31 | A kind of flue gas denitrification system with uniform ammonia-gas spraying device for boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720333608.5U CN206631410U (en) | 2017-03-31 | 2017-03-31 | A kind of flue gas denitrification system with uniform ammonia-gas spraying device for boiler |
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| Publication Number | Publication Date |
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| CN206631410U true CN206631410U (en) | 2017-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720333608.5U Active CN206631410U (en) | 2017-03-31 | 2017-03-31 | A kind of flue gas denitrification system with uniform ammonia-gas spraying device for boiler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109012104A (en) * | 2018-09-29 | 2018-12-18 | 苏州西热节能环保技术有限公司 | Boiler bypass flue direct-injection removes NOxAnd SO3System |
| CN110145732A (en) * | 2019-05-13 | 2019-08-20 | 哈尔滨锅炉厂有限责任公司 | Large coal powder boiler ultra-low load economizer switches bypath system |
-
2017
- 2017-03-31 CN CN201720333608.5U patent/CN206631410U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109012104A (en) * | 2018-09-29 | 2018-12-18 | 苏州西热节能环保技术有限公司 | Boiler bypass flue direct-injection removes NOxAnd SO3System |
| CN110145732A (en) * | 2019-05-13 | 2019-08-20 | 哈尔滨锅炉厂有限责任公司 | Large coal powder boiler ultra-low load economizer switches bypath system |
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