CN207970694U - A kind of ammonia nitrogen mixing arrangement for apparatus of thermo-electric power boiler spray ammonia system - Google Patents
A kind of ammonia nitrogen mixing arrangement for apparatus of thermo-electric power boiler spray ammonia system Download PDFInfo
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- CN207970694U CN207970694U CN201721733414.0U CN201721733414U CN207970694U CN 207970694 U CN207970694 U CN 207970694U CN 201721733414 U CN201721733414 U CN 201721733414U CN 207970694 U CN207970694 U CN 207970694U
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Abstract
The utility model solves the problems, such as that ammonia in flue gas nitrogen molar ratio is unevenly distributed at large electric power plant boiler SCR denitration system catalyst inlet more particularly to a kind of ammonia nitrogen mixing arrangement for apparatus of thermo-electric power boiler spray ammonia system.The utility model includes mixer unit group clockwise, mixer unit group, air distribution plate, motor and sealing device counterclockwise etc., supersonic speed ammonia air-flow is generated using Laval nozzle, strong volume inhales surrounding flue gas, and ammonia arrangement of nozzles be quadrangle tangential circle mode, it is formed and rotates strong local eddy currents area, strengthen the mixing of ammonia and flue gas.The utility model improves the relative speed difference of ammonia and flue gas using perforated distributor, solves the problems, such as that ammonia mixes difficulty with flue gas when boiler at low load operation.The utility model enables to the ammonia nitrogen molar ratio relative deviation in the flue gas of catalyst layer inlet to be in the width direction less than 5%, and the ammonia nitrogen molar ratio relative deviation along depth direction is less than 3%.
Description
Technical field
The utility model belongs to large electric power plant boiler SCR denitration field, and in particular to one kind is for apparatus of thermo-electric power boiler spray ammonia system
The ammonia nitrogen mixing arrangement of system.
Background technology
The SCR denitration system of China's thermoelectricity coal-burning boiler in actual moving process there are ammonia before catalyst layer entrance and
When flue gas mixes non-uniform problem, especially boiler at low load operation, the flow velocity of flue gas is relatively low in flue, and turbulence intensity is not
Foot, the ammonia flowed out from nozzle cannot be spread rapidly, so ammonia in flue gas nitrogen mole specific unbalance, leads to catalyst layer exit
Flue gas in occur that NOx content is higher or ammonia slip concentration is higher.
In order to solve this problem, Authorization Notice No. is that the Chinese patent of CN202096869U discloses a kind of SCR denitrations
The preposition secondary rectification static mixer of system includes support in flue and multiple on support frame as described above
Rectification mixing tab and secondary rectification mixing tab, support frame as described above are arranged in parallel with ammonia conveyance conduit, the ammonia conveyance conduit
The both sides of each ammonia nozzle be equipped with the secondary rectification mixing tab, the rectification mixing tab setting is defeated in the spray ammonia
Send immediately below the ammonia nozzle on pipeline and between two secondary rectification mixing tabs, the mixer can improve flue gas with
The uniformity of ammonia mixing promotes the conversion ratio in SCR reactors, but mixer design is complex, and in boiler
When underrun, lack the measure of enhancing flow perturbation.The Chinese patent of Publication No. CN101394919A discloses one kind
For making gaseous fluid be mixed with large flow-rate gas stream, particularly for reducing agent to be imported to the side in the flue gas comprising nitrogen oxides
Method and device, the process employs plate-like hybrid elements, and gas mixing, big flow gas to be promoted to flow through tilting hybrid element and formed
The strong lateral velocity component of vortex, vortex strengthens turbulent closure scheme.But due to several plate-like hybrid elements of flue cross section arrangement
Tilted to the same side, while plate-shaped blades size is larger, and big stock air-flow is flowed to rear, plate-shaped blades front edge side speed is low,
Rear side speed is high, and velocity field vibration is uneven, and even flow fieldization distance is longer.
Utility model content
The purpose of this utility model is to solve ammonia in flue gas nitrogen at large electric power plant boiler SCR denitration system catalyst inlet to rub
You are than problem unevenly distributed.The utility model provides the apparatus of thermo-electric power boiler that is used for that a kind of principle is advanced, simple in structure and sprays ammonia system
When the ammonia nitrogen mixing arrangement of system, especially boiler at low load are run, flue gas disturbance can be reinforced, improve flue gas flow rate so that ammonia
Gas and flue gas mix rapidly, reduce ammonia in flue gas nitrogen molar ratio degree of irregularity, and then reduce in the flue gas of catalyst layer exit
NOx depth and ammonia slip concentration.
The technical solution that the utility model solves above-mentioned technical problem is as follows：
It is a kind of for apparatus of thermo-electric power boiler spray ammonia system ammonia nitrogen mixing arrangement, including mixer unit group clockwise, counterclockwise
Mixer unit group, air distribution plate, motor and sealing device, the mixer unit group clockwise and mixer unit group counterclockwise
It is alternately arranged successively from left to right along denitration flue width direction, until being covered with entire denitration flue, air distribution plate is arranged each
Clockwise between mixer unit group and mixer unit group counterclockwise, the resistance hole that disappears is provided on air distribution plate, air distribution plate is led by it
Axis is positioned and is supported, and one end is made to be pierced by the outer wall of denitration flue, and is connect with motor, and main shaft and denitration flue are worn
Hole is sealed with sealing device.
The advantageous effect of above-mentioned apparatus is：
(1) the utility model significant advantage with ammonia and flue gas good mixing effect when boiler at low load is run.This
Be because：There is perforated distributor in the intermediate arrangement of mixer clockwise and mixer counterclockwise, band of the air distribution plate in motor
Support shaft can be surrounded under dynamic to rotate, when boiler load is relatively low, the exhaust gas volumn in flue is reduced therewith, and then flue gas flow rate drops
Low, turbulivity declines, and is unfavorable for the mixing of ammonia and flue gas, perforated distributor can be adjusted at this time to horizontal direction, reduces cigarette
Gas circulation area increases the relative velocity of ammonia and flue gas to improve flowing velocity when flue gas flows through Laval nozzle
Difference improves the mixed effect of ammonia and flue gas；
(2) the local flue gas of the utility model rotates strongly, good mixing effect, but flue gas is not in bright on the whole
Aobvious swirl feature does not interfere with being evenly distributed for flue gas flow rate, will not form the Local enrichment of flying dust.This is because：It is suitable
Hour hands mixer unit and mixer unit counterclockwise are evenly arranged along flue width direction for interval, mixer unit clockwise
Generation rotates clockwise air-flow, and mixer unit counterclockwise generates swirling eddy counterclockwise, this two bursts of flow rotation intensity are suitable,
Direction ultimately forms the flowing of flue gas direct current, and two strands of air-flows occur during cancelling out each other on the contrary, therefore cancel out each other
Strong shock, enhances mixed effect again；
(3) the utility model can realize that the ammonia nitrogen concentration along flue depth direction distributes very evenly.This is because：Often
All there are one individual regulating valves for a mixer unit, in the event of along flue width direction ammonia nitrogen molar concentration distribution deviation
Big phenomenon can be adjusted by regulating valve, specific method is by ammonia nitrogen molar concentration deviation be more than 1.05 region institute
Corresponding regulating valve reduces, and the regulating valve corresponding to region by ammonia nitrogen molar concentration deviation less than 1 is opened greatly, final to realize
Ammonia nitrogen molar concentration deviation is less than 5% in the width direction of entire flue；
(4) the ammonia nitrogen mixing arrangement of the utility model has the characteristics that system resistance is small.This is because：First, high load capacity
When operation, perforated distributor is vertical with flow of flue gas direction, will not occupy more flow area, and Laval nozzle is wing
Under the protection of wearing bush, vortex and recirculating zone will not be generated, so resistance is smaller；Second, when underrun, porous cloth
Aerofoil will occupy certain flow area, but multiple resistance holes that disappear are provided on the air distribution plate, can prevent from producing at the back side of air distribution plate
Raw vortex and recirculating zone, and cigarette speed is relatively low under this operating mode, flow resistance is smaller, so the additional resistance that ammonia nitrogen mixing arrangement generates
Power very little.
The mixer unit group clockwise includes at least two mixers clockwise, and the mixer clockwise is by 4
Nozzle assembly forms, and the injection directions of 4 nozzle assemblies forms clockwise imaginary circle, and 4 nozzle assemblies enter
Mouth is connect by the pipe equipped with regulating valve with ammonia main pipe.
The mixer unit group counterclockwise includes at least two mixers counterclockwise, and the mixer counterclockwise is by 4
Nozzle assembly forms, and the injection directions of 4 nozzle assemblies forms anticlockwise imaginary circle, and 4 nozzle assemblies enter
Mouth is connect by the pipe equipped with regulating valve with ammonia main pipe.
The advantageous effect of above-mentioned apparatus is：
(1) 4 Laval nozzle jet streams of the utility model can form air-flow vortex core, greatly strengthen and flue gas
Mixing velocity.This is because：The jet axis of 4 Laval nozzles forms imaginary circle, by the promotion of upstream airflow
Effect can generate using the center of imaginary circle as the rotary motion of center of vorticity, increase the turbulivity of flue gas, accelerate flue gas with
The mixing velocity of ammonia；
(2) the utility model can realize that the ammonia nitrogen concentration along flue depth direction distributes very evenly.This is because：The
One, along flue depth direction, it is evenly arranged mixer unit, each mixer unit can form an independent rotary pneumatic
Stream, at the position of two adjacent swirling eddies contact, the flow direction of air-flow is on the contrary, the therefore strong shock of generation, increases
Add disturbance degree, is very beneficial for the mixing of ammonia and flue gas.Second, there are one individually adjust for each mixer unit
Valve can be adjusted if there is the big phenomenon of ammonia nitrogen molar concentration distribution deviation along flue depth direction by regulating valve
It is whole, specific method is by ammonia nitrogen molar concentration deviation be more than 1.05 region corresponding to regulating valve reduce, ammonia nitrogen mole is dense
Regulating valve corresponding to region of the degree deviation less than 1 is opened greatly, final to realize that ammonia nitrogen mole is dense on the depth direction of entire flue
It spends deviation and is less than 3%；
(3) the ammonia flow basis equalization of each Laval nozzle of the utility model can prevent ammonia concentration local
It is too high or too low.This is because：The connection and reasonable arrangement of the service of ammonia, ammonia are first into horizontal flow pipe from main pipe
Centre position, then 4 angle branch pipes are uniformly diverted to from horizontal flow pipe, so ammonia is in the stream towards each Laval nozzle
Dynamic resistance loss is equal, so ensure that the flow of each Laval nozzle is of substantially equal.
The nozzle assembly is made of elbow, the double-deck deflector, straight pipe, Laval nozzle and wing wearing bush, double-deck
Deflector is mounted on the inside of elbow, and it is logical that elbow by cross-section principle is divided into flow area equal three by the double-deck deflector
The entrance in road, elbow is connect with ammonia branch pipe, and the outlet of elbow and the entrance of straight pipe connect, the outlet of straight pipe and Laval
The entrance of nozzle connects, and wing abrasionproof is set in the lower section of straight pipe and Laval nozzle.
The advantageous effect of above-mentioned apparatus is：
(1) it is strong can to form part for the momentum with supersonic airstream when the ammonia of the utility model is projected from nozzle
Disturbance mixing.This is because：When ammonia flows through elbow, under the action of the double-deck deflector, it can prevent from occurring partially due to inertia
The heart flows, it is ensured that ammonia is uniformly distributed along cross-section of pipeline, and is further mixed in straight pipe, the flow velocity and pressure of ammonia
Distribution all reaches unanimity, and is then fed into Laval nozzle injection, under the action of Laval nozzle specific structure, forms supersonic speed
The pressure energy of ammonia is transformed to kinetic energy by air-flow to the greatest extent, has longer range in flue gas, local dip is very
Strongly, and to flue gas around there is strong Involving velocity；
(2) Laval nozzle of the utility model has a longer life expectancy, and replaces and be easy.This is because：First, drawing is cut down
You are equipped with wing wearing bush in the windward side of nozzle, can prevent the ash cutting Laval nozzle in flue gas, and wing-shaped structure
It can effectively prevent vortex and reflux occur, to achieve the purpose that reduce local resistance loss；Second, Laval nozzle and
Straight pipe can in time be replaced using being threadedly coupled using the large and small chance of repairing of unit.
Description of the drawings
Fig. 1 is scheme of installation of the utility model in denitration flue；
Fig. 2 is the scheme of installation of mixer clockwise；
Fig. 3 is the scheme of installation of mixer counterclockwise；
Fig. 4 is the structural schematic diagram of nozzle assembly.
Specific implementation mode
The principles of the present invention and feature are described below in conjunction with attached drawing, example is served only for explaining this practicality
It is novel, it is not intended to limit the scope of the utility model.
As shown in Figure 1, a kind of ammonia nitrogen mixing arrangement for apparatus of thermo-electric power boiler spray ammonia system in the present embodiment, including up time
Needle mixer unit group 2, mixer unit group 4 counterclockwise, air distribution plate 5, motor 6 and sealing device 7；As shown in Fig. 2, described suitable
Hour hands mixer unit group 2 includes two mixers clockwise, and the mixer clockwise is made of 4 nozzle assemblies 21,4
The injection direction of nozzle assembly 21 forms the entrance of 23,4 nozzle assemblies 21 of clockwise imaginary circle by being equipped with
The pipe of regulating valve 22 is connect with ammonia main pipe；As shown in figure 3, the mixer unit group 4 counterclockwise includes two counterclockwise
Mixer, the mixer counterclockwise are made of 4 nozzle assemblies 21, and the injection direction of 4 nozzle assemblies 21 forms the inverse time
The entrance of 23,4 nozzle assemblies 21 of imaginary circle in needle direction is connect by the pipe equipped with regulating valve 22 with ammonia main pipe；Such as
Shown in Fig. 4, the nozzle assembly 21 is by elbow 211, the double-deck deflector 212, straight pipe 213, Laval nozzle 214 and wing
Wearing bush 215 forms, and the double-deck deflector 212 is mounted on the inside of elbow 211, and the double-deck deflector 212 presses cross-section principle will be curved
First 211 points are equal three channels of flow area, and the entrance of elbow 211 connect with ammonia branch pipe, the outlet of elbow 211 and directly
The entrance of pipeline section 213 connects, and the outlet of straight pipe 213 is used with the entrance of Laval nozzle 214 and is threadedly coupled, wing abrasionproof
Set 215 is mounted on the lower section of straight pipe 213 and Laval nozzle 214 using screw connecting mode；The mixer list clockwise
Tuple and mixer unit group 4 counterclockwise are alternately arranged successively from left to right along 1 width direction of denitration flue, until being covered with entire
The depth direction of denitration flue 1, mixer unit group 2 clockwise are a row along the depth direction of denitration flue 1, are mixed counterclockwise
Device unit group 3 is a row along the depth direction of denitration flue 1, and the setting of air distribution plate 5 is in each mixer unit group 2 clockwise and inverse
Between hour hands mixer unit group 4, the resistance hole 8 that disappears is provided on air distribution plate 5, air distribution plate 5 is positioned and is supported by its main shaft 3,
And one end is made to be pierced by the outer wall of denitration flue 1, and connect with motor 6, the perforation sealing device of main shaft 3 and denitration flue 1
7 are sealed.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all in this practicality
Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model
Within the scope of shield.
Claims (4)
1. a kind of ammonia nitrogen mixing arrangement for apparatus of thermo-electric power boiler spray ammonia system, it is characterised in that：Including mixer unit clockwise
Group (2), mixer unit group counterclockwise (4), air distribution plate (5), motor (6) and sealing device (7), the mixer list clockwise
Tuple (2) and mixer unit group counterclockwise (4) are alternately arranged successively from left to right along denitration flue (1) width direction, until
It is covered with entire denitration flue (1), air distribution plate (5) is arranged in each mixer unit group (2) clockwise and mixer list counterclockwise
Between tuple (4), resistance hole (8) that disappears is provided on air distribution plate (5), air distribution plate (5) is positioned and is supported by its main shaft (3), and
So that one end is pierced by the outer wall of denitration flue (1), and connect with motor (6), the perforation of main shaft (3) and denitration flue (1) is with close
Seal apparatus (7) is sealed.
2. a kind of ammonia nitrogen mixing arrangement for apparatus of thermo-electric power boiler spray ammonia system according to claim 1, it is characterised in that：Institute
It includes at least two mixers clockwise to state mixer unit group (2) clockwise, and the mixer clockwise is by 4 nozzle assemblies
(21) it forms, the injection direction of 4 nozzle assemblies (21) forms clockwise imaginary circle (23), 4 nozzle assemblies
(21) entrance is connect by being equipped with the pipe of regulating valve (22) with ammonia main pipe.
3. a kind of ammonia nitrogen mixing arrangement for apparatus of thermo-electric power boiler spray ammonia system according to claim 2, it is characterised in that：Institute
It includes at least two mixers counterclockwise to state mixer unit group (4) counterclockwise, and the mixer counterclockwise is by 4 nozzle assemblies
(21) it forms, the injection direction of 4 nozzle assemblies (21) forms anticlockwise imaginary circle (23), 4 nozzle assemblies
(21) entrance is connect by being equipped with the pipe of regulating valve (22) with ammonia main pipe.
4. a kind of ammonia nitrogen mixing arrangement for apparatus of thermo-electric power boiler spray ammonia system according to claim 2 or 3, feature exist
In：The nozzle assembly (21) by elbow (211), the double-deck deflector (212), straight pipe (213), Laval nozzle (214) and
Wing wearing bush (215) composition, the double-deck deflector (212) are mounted on the inside of elbow (211), the double-deck deflector (212) by etc.
Elbow (211) is divided into three equal channels of flow area by section principle, and the entrance of elbow (211) is connect with ammonia branch pipe,
The outlet of elbow (211) is connect with the entrance of straight pipe (213), outlet and the Laval nozzle (214) of straight pipe (213)
Entrance connects, and wing wearing bush (215) is located at the lower section of straight pipe (213) and Laval nozzle (214).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721733414.0U CN207970694U (en) | 2017-12-13 | 2017-12-13 | A kind of ammonia nitrogen mixing arrangement for apparatus of thermo-electric power boiler spray ammonia system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721733414.0U CN207970694U (en) | 2017-12-13 | 2017-12-13 | A kind of ammonia nitrogen mixing arrangement for apparatus of thermo-electric power boiler spray ammonia system |
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| CN207970694U true CN207970694U (en) | 2018-10-16 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107875847A (en) * | 2017-12-13 | 2018-04-06 | 山西大学 | A kind of ammonia nitrogen mixing arrangement for apparatus of thermo-electric power boiler spray ammonia system |
| CN109339914A (en) * | 2018-12-06 | 2019-02-15 | 武汉理工大学 | A kind of SCR denitration system spiral plate type static mixer peculiar to vessel |
| CN109876658A (en) * | 2019-04-08 | 2019-06-14 | 国电环境保护研究院有限公司 | Subregion vortex volume inhales spray ammonia system and spray ammonia adjusting method |
-
2017
- 2017-12-13 CN CN201721733414.0U patent/CN207970694U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107875847A (en) * | 2017-12-13 | 2018-04-06 | 山西大学 | A kind of ammonia nitrogen mixing arrangement for apparatus of thermo-electric power boiler spray ammonia system |
| CN107875847B (en) * | 2017-12-13 | 2023-12-29 | 山西大学 | Ammonia nitrogen mixing device for thermal power boiler ammonia spraying system |
| CN109339914A (en) * | 2018-12-06 | 2019-02-15 | 武汉理工大学 | A kind of SCR denitration system spiral plate type static mixer peculiar to vessel |
| CN109876658A (en) * | 2019-04-08 | 2019-06-14 | 国电环境保护研究院有限公司 | Subregion vortex volume inhales spray ammonia system and spray ammonia adjusting method |
| CN109876658B (en) * | 2019-04-08 | 2023-07-07 | 国电环境保护研究院有限公司 | Partition vortex entrainment ammonia spraying system and ammonia spraying adjusting method |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211105 Address after: 030032 room 1806, 18 / F, building C, qingkong innovation base, No. 529, South Central Street, Taiyuan Xuefu Park, comprehensive reform demonstration zone, Taiyuan, Shanxi Province Patentee after: Shanxi Changyuan Mingcheng Technology Co.,Ltd. Address before: 030006 No. 92, Hollywood Road, Taiyuan, Shanxi Patentee before: SHANXI University |
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| TR01 | Transfer of patent right |
Effective date of registration: 20220316 Address after: 030000 103 Internet plus intelligence Industrial Park F block 156, South Inner Ring East Street, Yingze District, Taiyuan, Shanxi Patentee after: SHANXI CHANGDE DACHENG TECHNOLOGY Co.,Ltd. Address before: 030032 room 1806, 18 / F, building C, qingkong innovation base, No. 529, South Central Street, Taiyuan Xuefu Park, comprehensive reform demonstration zone, Taiyuan, Shanxi Province Patentee before: Shanxi Changyuan Mingcheng Technology Co.,Ltd. |