CN208356517U - A kind of denitrification apparatus using ammonia-spraying grid - Google Patents
A kind of denitrification apparatus using ammonia-spraying grid Download PDFInfo
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- CN208356517U CN208356517U CN201820234054.8U CN201820234054U CN208356517U CN 208356517 U CN208356517 U CN 208356517U CN 201820234054 U CN201820234054 U CN 201820234054U CN 208356517 U CN208356517 U CN 208356517U
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- ammonia
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- hole
- catalyst layer
- flue gas
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Abstract
The utility model discloses a kind of denitrification apparatus using ammonia-spraying grid, including gas mixer and SCR reactor, the entrance of the gas mixer connects boiler economizer exhaust pass, the entrance of the outlet connection SCR reactor of gas mixer；In the gas mixer, it is disposed with ammonia-spraying grid and ammonia mixer along flue gas approach axis, the ammonia mixer makes ammonia and contains nitrogen oxides NOXFlue gas sufficiently and after evenly mixing enter the inlet duct of SCR reactor, be provided with deflector in the inlet duct of the SCR reactor, the SCR inside reactor is provided with rectifier, catalyst layer.The utility model not only makes the ammonia amount sprayed uniform, makes NH3It is uniform with flue gas hybrid reaction, and by adjusting ammonia nozzle aperture, make the NO that reduction is needed in each ammonia nozzle flow and flue gasXContent matches, in order to avoid part is caused to spray ammonia excess, guarantees denitration effect.
Description
Technical field
The utility model relates to environment-friendlydenitration denitration technical fields, and in particular to a kind of denitrification apparatus using ammonia-spraying grid, together
Ammonia-spraying grid device of the sample suitable for various combustion apparatus discharge flue gas.
Background technique
Nitrogen oxides is pair of the national strict control discharge after sulfur dioxide as one of main atmosphere pollution
As the total amount of China's discharged nitrous oxides is about 1624.5 ten thousand tons at present.Present most widely used gas denitrifying technology is SCR
Technology, SCR technology denitration efficiency can reach 95% or more, by out of stock high-efficient, selective good, applied widely, stable
The advantages that reliable, has been grown rapidly, from the seventies later period since First power plant SCR device is installed by Japan in Japan
It has had more than 170 business SCR devices running, the out of stock device of SCR has become the indispensability of power plant of developed country, working principle
It is the NO in flue gas at a temperature of 280-420 DEG C2With the reducing agent NH sprayed into the flue of upstream3It restores under the action of catalyst
Reaction produces N2And H2O etc..
Currently, selective catalytic reduction (SCR) denitration process are widely used in many fields, SCR denitrating technique needs ammonia
As reducing agent, general there are three types of forms: liquefied ammonia, urea, ammonium hydroxide, the prior art use more for liquefied ammonia, most SCR
Denitration technology also all uses this technique, and the performance indicator of SCR system mainly includes denitration efficiency and NH3Escapement ratio, the diffusion of ammonia
And mix with flue gas the core technology institute that uniformity coefficient is one of key factor for influencing denitration efficiency and each company
?.The main spray ammonia mixing arrangement of SCR is ammonia-spraying grid (AIG) at present, and ammonia-spraying grid design at that time, does not be easy to cause NOXWith
NH3Mixing and reaction it is uneven, not only influence denitration efficiency and economy, and it is excessive easily to cause part to spray ammonia, can also
Influence denitration effect and stable operation.
Summary of the invention
In order to overcome the disadvantages mentioned above of the prior art, the utility model proposes a kind of denitration dresses using ammonia-spraying grid
It sets, fully considers influence of the gas-static to mixing length in ammonia-spraying grid, carried out by the structure to existing ammonia-spraying grid
It improves, the ammonia amount for spraying spout is generally uniform, makes NH3It is uniform with flue gas hybrid reaction, and by adjusting the spray of each ammonia
The aperture of mouth valve makes the NO that reduction is needed in each ammonia nozzle flow and flue gasXContent matches, in order to avoid part is caused to spray ammonia mistake
Amount；Guarantee during spraying ammonia, it is each to spray the ammonia amount that ammonia hole sprays and keep identical, to not interfere with the mixed of ammonia and flue gas
Length is closed, guarantees denitration effect.
In order to achieve the above objectives, the technical solution adopted in the utility model is a kind of denitrification apparatus using ammonia-spraying grid,
Including gas mixer and SCR reactor, the entrance of the gas mixer connects boiler economizer exhaust pass, gas
The entrance of the outlet connection SCR reactor of mixing arrangement；In the gas mixer, it is disposed with along flue gas approach axis
Ammonia-spraying grid and static mixer, the static mixer make ammonia and contain nitrogen oxides NOXFlue gas it is sufficiently and uniformly mixed
Enter the inlet duct of SCR reactor after conjunction, is provided with deflector in the inlet duct of the SCR reactor, the SCR is anti-
Device is answered to be internally provided with rectifier, catalyst layer, the deflector, rectifier, catalyst layer successively connect along flow of flue gas direction
It connects.
Further, the ammonia-spraying grid uses variable diameter spray orifice, is made of more spray ammonia pipes arranged side by side, sprays edge on ammonia pipe
Axially it is uniformly arranged multiple spray ammonia holes.
Further, the ammonia is sprayed from the spray ammonia hole of ammonia-spraying grid, and the spray ammonia pipe is by ammonia main pipe and ammonia branch
Pipe composition conveys the ammonia main pipe of ammonia, is equipped with valve regulation on ammonia branch pipe, to adjust the input quantity of ammonia, selects
Best ammonia nitrogen molar ratio.
Further, ammonia branch pipe one end is equipped with fixed end and is equipped with several ammonia spray heads, the ammonia above
The top at the both ends of gas nozzle is connected with flow equilibrium pipe, and the ammonia spray head is equipped with spray ammonia hole.
Further, the spray ammonia hole is round hole, according to the flow direction of ammonia from the inlet end of spray ammonia pipe to end, institute
The diameter for stating spray ammonia hole is successively gradually reduced.
Further, the spray ammonia hole of least significant end is circular jetting ammonia hole on the spray ammonia pipe, remaining spray ammonia hole is oblateness
Ammonia hole is sprayed, the both ends in the oblate spray ammonia hole are set as symmetrical arc, the radius and the radius phase in circular jetting ammonia hole of arc
Together.
Further, the catalyst layer includes the first catalyst layer, the second catalyst layer and preparing catalyst layer, described
First catalyst layer, the second catalyst layer and preparing catalyst layer are set gradually along flow of flue gas direction.
Compared with prior art, the utility model has the advantage that
1. traditional ammonia-spraying grid structure static pressure in spout rear pass is consistent, in the identical situation of nozzle diameter, each to spray
The gaseous mixture scale of construction that mouth sprays increases along the extending direction of spray ammonia pipeline, so that the ammonia amount of each spout ejection is uneven, increases
Ammonia/flue gas mixing length, affects denitration effect, and the utility model is by using the ammonia-spraying grid of variable diameter spray orifice,
The size in each spray ammonia hole is gradually reduced with the flow direction of ammonia, to guarantee during spraying ammonia, each ammonia hole of spraying sprays
Ammonia amount it is roughly the same, so that not interfering with ammonia mixes with flue gas length, denitration effect will not be weakened；
2. specifically the aperture in ammonia hole is sprayed in design as needed in the spray ammonia hole of the ammonia-spraying grid of the utility model, to meet more
Use in the case of kind needs, and compact-sized, easy to process, implementation result is good, is suitble to promote the use of.
In conclusion compared with prior art, the utility model structure is simple, design is rationally, easy to process, not only makes to spray
Ammonia amount out is uniform, makes NH3It is uniform with flue gas hybrid reaction, and by adjusting ammonia nozzle aperture, make each ammonia nozzle
The NO of reduction is needed in flow and flue gasXContent matches, in order to avoid part is caused to spray ammonia excess, guarantees denitration effect.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in application, for those of ordinary skill in the art, without creative efforts,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 show the utility model using the structural schematic diagram of the denitrification apparatus of ammonia-spraying grid；
Fig. 2 show the spray ammonia pipe partial structural diagram of the utility model；
Fig. 3 show the spray ammonia pore structure schematic diagram of the utility model.
Specific embodiment
It is described in detail below in conjunction with the technical scheme in the embodiment of the utility model:
A kind of denitrification apparatus using ammonia-spraying grid as shown in Figure 1, including gas mixer and SCR reactor, institute
The entrance connection boiler economizer exhaust pass of gas mixer is stated, the outlet connection SCR reactor of gas mixer
Entrance；In the gas mixer, ammonia-spraying grid 3 and ammonia mixer 4, the ammonia are disposed with along flue gas approach axis
Gas mixer 4 makes ammonia and contains nitrogen oxides NOXFlue gas sufficiently and after evenly mixing enter SCR reactor inlet tube
Road is provided with deflector 8 in the inlet duct of the SCR reactor, and the SCR inside reactor is provided with rectifier 9, urges
Agent layer, the deflector 8, rectifier 9, catalyst layer are sequentially connected along flow of flue gas direction.
The catalyst layer includes the first catalyst layer 5, the second catalyst layer 6 and preparing catalyst layer 7, and described first urges
Agent layer 5, the second catalyst layer 6 and preparing catalyst layer 7 are set gradually along flow of flue gas direction.
The workflow of the utility model as shown in Figure 1 are as follows: ammonia inputs ammonia-spraying grid after first pressurizeing again, firstly, will
The flue gas containing nitrogen oxides is exported from boiler economizer to be sent into through connection flue by the more spray ammonia that spray ammonia pipe forms side by side
Grid 3, for the spray ammonia pipe by forming with ammonia branch pipe 2, ammonia inputs ammonia-spraying grid again after first pressurizeing, and 3, along the flowing side of ammonia
To the diameter on ammonia-spraying grid 3 along the spray ammonia hole of spray ammonia pipe axial alignment is gradually reduced, spray of the ammonia from ammonia-spraying grid 3
Ammonia hole sprays, and conveys the main ammonia main pipe 1 of ammonia, is equipped with valve regulation on 2 pipeline of ammonia branch pipe, to adjust the defeated of ammonia
Enter amount, select best ammonia nitrogen molar ratio, is sufficiently mixed flue gas with the ammonia that ammonia hole sprays is sprayed；Then, make through ammonia mixer 4
Ammonia with contain nitrogen oxides NOXFlue gas sufficiently and uniformly mixing, then through deflector 8 enter SCR reactor top gas
Room, ammonia, which mixes with flue gas to enter in multi-layer catalyst layer after the rectified device 9 of gas, is reduced into N2And H2O；Finally, SCR reacts
The flue gas after denitration that device comes out returns to the flue before boiler air preheater, is discharged after heat exchange, dedusting and desulfurization.
As shown in Figure 1, 2, the ammonia-spraying grid uses variable diameter spray orifice, is made of more spray ammonia pipes arranged side by side, sprays ammonia pipe
On along axial direction be uniformly arranged multiple spray ammonia holes；The spray ammonia pipe is made of ammonia main pipe 1 and ammonia branch pipe 2, the ammonia branch pipe 2
One end is equipped with fixed end 10 and is equipped with several ammonia spray heads 12 above, and the top at the both ends of the ammonia spray head 12 is connected with
Flow equilibrium pipe 11, the ammonia spray head 12 are equipped with spray ammonia hole.
As shown in figure 3, the spray ammonia hole is round hole, from the air inlet of spray ammonia pipe to end, spray the diameter in ammonia hole by
Decrescence small, the design is general to ammonia spraying amount control precision.The spray ammonia hole E of least significant end is provided in round spray ammonia on spray ammonia pipe
Hole sprays remaining spray ammonia hole A, B, C, D on ammonia pipe and is disposed as oblate spray ammonia hole, and the both ends in oblateness spray ammonia hole are set as pair
The radius of the arc of title, arc is identical as the radius in circular jetting ammonia hole, from the air inlet of spray ammonia pipe to end, oblateness spray ammonia hole
Length be sequentially reduced, which to it is each spray ammonia hole ammonia spraying amount control precision it is higher.
As shown in figure 1 to 3, the workflow of the utility model is as follows for ginseng:
The SCR denitration device of the utility model when in use, by ammonia it is pressurized after input ammonia-spraying grid, ammonia is from grid
Spray ammonia hole spray, convey the master of ammonia, be equipped with valve regulation on branch pipe(tube), to adjust the input quantity of ammonia, selection is most
Good ammonia nitrogen molar ratio, static mixer can guarantee the nitrogen oxides in ammonia and flue gas in the common work of turbulent flow and flow mixing device
The full and uniform mixing under, deflector uniformly introduces uniformly mixed ammonia and flue gas in the top gas chamber of SCR reactor, raw
At the air-flow being uniformly mixed, flow velocity is gentle, then through catalytic reduction reaction, realize denitration.
The spray ammonia bore is 100mm, inlet flow rate 18.6m/s, sprays and designs 5 spray orifices on ammonia pipe, presses respectively
Following three scheme is designed:
Scheme one: it according to common design form, sprays ammonia hole and is designed by equal diameter, the diameter in spray ammonia hole is 40mm；
Scheme two: spray ammonia hole uses circular jetting ammonia hole, and from the inlet end of spray ammonia pipe to end, the diameter for spraying ammonia hole successively subtracts
It is small, respectively 43.6mm, 42.4mm, 41.1mm, 40.4mm, 40mm；
Scheme three: ammonia hole design method, circular jetting ammonia are sprayed using the mixing of circular jetting ammonia hole+oblateness spray ammonia hole in spray ammonia hole
The radius of hole and arc is that (length in oblateness spray ammonia hole can regard the length of the middle section radius * 2+ of arc as to 20mm
Degree), the length in each oblate spray ammonia hole is followed successively by (40+6) mm, (40+4) mm, (40+2) mm, (40+ along ammonia flow direction
1) mm, the diameter in circular jetting ammonia hole are 40mm.
Simulation model is established respectively to above scheme by Computer Simulation Software, by the way that identical spray ammonia condition is arranged,
Inlet flow rate is 0.1736kg/s, and outlet relative pressure is 0Pa, according to analog result, sprays the import of ammonia pipe and each spout flow such as
Shown in following table:
To sum up, ammonia hole mode, maximum and minimum spray ammonia hole are sprayed using second scheme and the variable diameter of the third scheme
Difference in flow greatly reduce, the ammonia of ejection is more uniform, is more advantageous to the mixing of ammonia/flue gas.
The above is only the specific embodiments of the application, it is noted that is that those skilled in the art come
It says, under the premise of not departing from the application principle, several improvements and modifications can also be made, these improvements and modifications also should be regarded as
The protection scope of the application.
Claims (4)
1. a kind of denitrification apparatus using ammonia-spraying grid, including gas mixer and SCR reactor, which is characterized in that described
The entrance of gas mixer connects boiler economizer exhaust pass, and the outlet connection SCR reactor of gas mixer enters
Mouthful；In the gas mixer, it is disposed with ammonia-spraying grid and ammonia mixer along flue gas approach axis, the ammonia is mixed
Clutch makes ammonia and the flue gas containing nitrogen oxides NOX sufficiently and after evenly mixing into the inlet duct of SCR reactor, described
Deflector is provided in the inlet duct of SCR reactor, the SCR inside reactor is provided with rectifier, catalyst layer, institute
Deflector, rectifier, catalyst layer is stated to be sequentially connected along flow of flue gas direction；The ammonia-spraying grid uses variable diameter spray orifice, by
More spray ammonia pipes arranged side by side are constituted, and are sprayed and are uniformly arranged multiple spray ammonia holes along axial direction on ammonia pipe, and ammonia is from the spray ammonia hole of ammonia-spraying grid
It sprays, the spray ammonia pipe is made of ammonia main pipe and ammonia branch pipe, conveys the ammonia main pipe of ammonia, is equipped with valve on ammonia branch pipe
Door regulation, ammonia branch pipe one end are equipped with fixed end and are equipped with several ammonia spray heads above, and the two of the ammonia spray head
The top at end is connected with flow equilibrium pipe, and the ammonia spray head is equipped with spray ammonia hole.
2. a kind of denitrification apparatus using ammonia-spraying grid according to claim 1, which is characterized in that the spray ammonia hole is circle
Shape hole, according to the flow direction of ammonia from the inlet end of spray ammonia pipe to end, the diameter in the spray ammonia hole is successively gradually reduced.
3. a kind of denitrification apparatus using ammonia-spraying grid according to claim 1, which is characterized in that on the spray ammonia pipe most
The spray ammonia hole of end is circular jetting ammonia hole, remaining spray ammonia hole is oblate spray ammonia hole, and the both ends in the oblate spray ammonia hole are set
It is set to symmetrical arc, the radius of arc is identical as the radius in circular jetting ammonia hole.
4. a kind of denitrification apparatus using ammonia-spraying grid according to claim 1, which is characterized in that the catalyst layer packet
Include the first catalyst layer, the second catalyst layer and preparing catalyst layer, first catalyst layer, the second catalyst layer and spare
Catalyst layer is set gradually along flow of flue gas direction.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820234054.8U CN208356517U (en) | 2018-02-09 | 2018-02-09 | A kind of denitrification apparatus using ammonia-spraying grid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820234054.8U CN208356517U (en) | 2018-02-09 | 2018-02-09 | A kind of denitrification apparatus using ammonia-spraying grid |
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| CN208356517U true CN208356517U (en) | 2019-01-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113204872A (en) * | 2021-04-29 | 2021-08-03 | 上海明华电力科技有限公司 | Uneven ammonia spraying partition nozzle resistance design method based on numerical simulation |
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2018
- 2018-02-09 CN CN201820234054.8U patent/CN208356517U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113204872A (en) * | 2021-04-29 | 2021-08-03 | 上海明华电力科技有限公司 | Uneven ammonia spraying partition nozzle resistance design method based on numerical simulation |
| CN113204872B (en) * | 2021-04-29 | 2023-03-17 | 上海明华电力科技有限公司 | Uneven ammonia spraying partition nozzle resistance design method based on numerical simulation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210330 Address after: 474550 Yangcheng Township jienan Industrial Park, Xixia County, Nanyang City, Henan Province Patentee after: Xixia Longxing Metallurgical Materials Co.,Ltd. Address before: 474550 north section of Chuangye Avenue, Xixia County, Nanyang City, Henan Province Patentee before: HENAN HUANBI ENVIRONMENTAL PROTECTION ENGINEERING EQUIPMENT Co.,Ltd. |
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| TR01 | Transfer of patent right |