CN108543420A - A kind of adjust automatically strengthens mixing and anti-blocking ammonia-spraying grid device and its spray ammonia method simultaneously - Google Patents
A kind of adjust automatically strengthens mixing and anti-blocking ammonia-spraying grid device and its spray ammonia method simultaneously Download PDFInfo
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- CN108543420A CN108543420A CN201810464267.4A CN201810464267A CN108543420A CN 108543420 A CN108543420 A CN 108543420A CN 201810464267 A CN201810464267 A CN 201810464267A CN 108543420 A CN108543420 A CN 108543420A
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- nozzle
- flue gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Environmental & Geological Engineering (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention relates to a kind of adjust automaticallies to strengthen mixing and anti-blocking ammonia-spraying grid device and its spray ammonia method simultaneously, belongs to coal-burning boiler field of environment protection.Existing ammonia-spraying grid ammonia and flue gas mixed effect are poor, adjustment workload is larger, is easy obstruction.Flue gas flow rate tracks of device is connect with No.1 lever in the present invention, and No.1 lever is connect with spray ammonia branch pipe；No. two levers are connect with No.1 lever, and No. two levers are also connect with connecting rod；Connecting rod is located at the inside of nozzle, and it sequentially passes through nozzle degree adjustment valve and elastomeric element and is connect with support ring, nozzle degree adjustment valve is located on nozzle, elastomeric element is located in nozzle, adjacent with the nozzle degree adjustment valve and inner wall with nozzle in one end of elastomeric element is fixed, and the other end and the support ring of elastomeric element are fixed；Guide ring is arranged on the outer wall of nozzle, and No. two levers run through guide ring；Nozzle is connected to spray ammonia branch pipe.The present invention realizes the aperture that each nozzle is adjusted automatically according to flue gas flow rate using simple and mechanical principle.
Description
Technical field
The present invention relates to a kind of adjust automaticallies to strengthen mixing and anti-blocking ammonia-spraying grid device and its spray ammonia method simultaneously, belongs to
In coal-burning boiler field of environment protection.
Background technology
Coal generates a large amount of harmful substances in combustion, the NOx pollution problems that thermal power industry fire coal generates by
To the extensive concern of various circles of society.To realize that coal unit minimum discharge is transformed comprehensively, to the stable and high effective operation of denitrification apparatus
Propose stern challenge.The operating condition of ammonia-spraying grid be directly related to the NOx removal efficiency of denitrating system, the escaping of ammonia rate,
Catalyst life and air preheater blocking etc..
There are some shortcoming and defect for traditional ammonia-spraying grid：Traditional ammonia-spraying grid uses linear arrangement or subregion cloth
It sets, is identical in the emitted dose of the same line or the same restore-zone, such as application No. is in 201710070946.9
State's patent, but flue flow field is unevenly distributed, and each spray site flue gas flow is all different even real-time change, faces this feelings
Condition, no matter ammonia-spraying grid linear arrangement or subregion arrangement ammonia and flue gas mixed effect it is poor.Traditional ammonia-spraying grid adjustment
Workload is larger, ammonia-spraying grid be typically no longer change with the variation of load and flue flow field situation after adjusting, but
Flue flow field situation is complicated, variation all almost is occurring every second, therefore traditional ammonia-spraying grid becomes flue gas condition
The adaptability of change is poor, this causes running efficiency of system low.In addition, part nozzle opening is upward in ammonia-spraying grid, it is easy by cigarette
Collapse ash or underload fallout obstruction in road.
Invention content
It is an object of the invention to overcome above-mentioned deficiency existing in the prior art, and provide a kind of the automatic of reasonable design
Mixing and anti-blocking ammonia-spraying grid device and its spray ammonia method are adjusted while strengthening, by arranging that there is flue gas flow-disturbing at nozzle
Flue gas flow rate is fed back to nozzle degree adjustment valve to adjust its aperture by the flue gas flow rate tracks of device of effect using lever principle
Size realizes the purpose that each nozzle aperture is adjusted automatically according to flue gas flow rate to adjust the intensity of nozzle sprays gas.
Technical solution is used by the present invention solves the above problems：A kind of adjust automatically strengthens mixing and anti-blocking simultaneously
Ammonia-spraying grid device, which is characterized in that including flue gas flow rate tracks of device, No.1 lever, No. two levers, connecting component, nozzles
Degree adjustment valve, elastomeric element, connecting rod, support ring, nozzle, spray ammonia branch pipe, No.1 shaft, No. two shafts and guide ring；Institute
It states flue gas flow rate tracks of device to connect with one end of No.1 lever, the other end of the No.1 lever passes through No.1 shaft and spray ammonia
Branch pipe connects；One end of No. two levers is connect by No. two shafts with No.1 lever, and the other end of No. two levers is logical
Connecting component is crossed to connect with connecting rod；The connecting rod is located at the inside of nozzle, and the connecting rod sequentially passes through nozzle aperture tune
Section valve and elastomeric element are simultaneously connect with support ring, and the nozzle degree adjustment valve is located on nozzle, and the elastomeric element is located at spray
In mouth, adjacent with the nozzle degree adjustment valve and inner wall with nozzle in one end of the elastomeric element is fixed, the elastomeric element
The other end is fixed with support ring；The guide ring is arranged on the outer wall of nozzle, and No. two levers run through guide ring；The spray
Mouth is connected to spray ammonia branch pipe.Flue gas flow rate tracks of device is used to carry out flow-disturbing to flue gas, so that flue gas is generated vortex, while driving one
Number lever is moved, and under the drive of No.1 lever, No. two levers also move, to pull nozzle degree adjustment valve with
Gap is generated between nozzle, and gas in nozzle is made to project.
Furthermore, the nozzle is provided with several, several nozzles are arranged in order on spray ammonia branch pipe.In nozzle
The gas flow of ejection is suitable for the flue gas flow of different location.
Furthermore, the nozzle is arranged vertically with spray ammonia branch pipe.
Furthermore, the flue gas flow rate tracks of device is rigidly connected with No.1 lever.It can be more sensitively to flue gas
The flow velocity of flue gas is responded at flow velocity tracks of device, convenient for making nozzle degree adjustment valve have suitable aperture.
Furthermore, the nozzle degree adjustment valve is inverted cone-shaped structure, and the nozzle degree adjustment valve is located at nozzle
End, the nozzle degree adjustment valve and nozzle coordinate.When flue gas flow rate is 0m/s, nozzle degree adjustment valve completely closes.
Furthermore, the support ring is hollow platy structure, is circulated for gas.It is logical from centre convenient for gas
It crosses.
A kind of adjust automatically as described above strengthens the spray ammonia method of mixing and anti-blocking ammonia-spraying grid device simultaneously, special
Sign is that the spray ammonia method is as follows：Flue gas in flow process with flue gas flow rate tracks of device bump against, and flue gas flow rate with
Vortex is formed at track device；Flue gas flow rate tracks of device and No.1 lever rotate under the promotion of flue gas around No.1 shaft, to
No. two levers are driven to be rotated around No. two shafts, meanwhile, No. two levers are moved with guide ring；Under the action of No. two levers,
Connecting rod movement is pulled by connecting component, to drive nozzle degree adjustment valve to move, nozzle degree adjustment valve is made to open, spray
Ammonia air Mixture in ammonia branch pipe sprays and violent with flue gas under the turbulent flow of flue gas at the flue gas flow rate tracks of device
Mixing.The flow that nozzle sprays gas can be voluntarily adjusted according to the flow velocity of flue gas, adapt to the change that flue gas flow occurs in flue
Change, it is adaptable, improve the operational efficiency of system.
Furthermore, the flue gas flow rate tracks of device and No.1 lever are according to the different around No.1 shaft of flue gas flow rate
Rotate different angles.To control the aperture of nozzle degree adjustment valve, flue gas flow variation is adapted it to.
Furthermore, each flue gas flow rate tracks of device is adjusted accordingly according to the flue gas flow rate of its position
The opening size of nozzle degree adjustment valve, the flue gas flow rate ranging from 0-20m/s of response, to realize automatically according to flue gas stream
The purpose of each nozzle aperture of velocity modulation section.
Furthermore, when flue gas flow rate is zero, tight fit between nozzle degree adjustment valve and the inner wall of nozzle；With
The aperture of the increase nozzle degree adjustment valve of flue gas flow rate increases.
Compared with prior art, the present invention haing the following advantages and effect：
1, flue gas flow rate tracks of device can adjust the aperture of nozzle degree adjustment valve in time according to flue gas flow before nozzle, to
Avoid that flue gas flow is small caused by traditional ammonia-spraying grid equalization spray ammonia region ammonia density is excessively high and the NH that generates4HSO4Phenomenon
And the too low caused NOx of the big region ammonia density of flue gas flow is not surpassed by abundant remove in turn before the escaping of ammonia phenomenon and nozzle
Mark discharge phenomenon.
2, flue gas flow rate tracks of device, which has both, makes to flow through the effect that its flue gas generates vortex, strengthens cigarette under the action of vortex
The ammonia that gas is sprayed with nozzle mixes, and is fully reacted with NOx conducive to subsequent catalyst section ammonia.
3, nozzle degree adjustment valve is 0 m/s in flue gas flow rate or shutdown is closed, and can effectively avoid flue dust
It settles and nozzle blockage caused by the ash that collapses is equal, to avoid under the serious unevenness of the spray ammonia caused by nozzle blockage, denitration efficiency
Drop, the escaping of ammonia is exceeded, the asymmetric consumption of catalyst life, NH4HSO4A series of problems, such as deposition and equipment resistance increase.
4, flue gas flow rate tracks of device chooses wear-resistant material, and other equipment and part are common iron；Certainly using machinery
The dynamic failure rate that passes to is small, stable, is operated without special messenger, and Inspection and maintenance during need to only shutting down has complete production domesticization
Condition, equipment and operation expense are low.
Description of the drawings
Fig. 1 be in the present embodiment adjust automatically and meanwhile strengthen mixing and anti-blocking ammonia-spraying grid device front view structure signal
Figure.
Fig. 2 be in the present embodiment adjust automatically and meanwhile strengthen mixing and anti-blocking ammonia-spraying grid device sectional structure signal
Figure.
In figure：Flue gas flow rate tracks of device 1,2, No. two levers 3 of No.1 lever, connecting component 4, nozzle degree adjustment valve 5,
Elastomeric element 6, connecting rod 7, support ring 8, nozzle 9, spray ammonia branch pipe 10, No.1 shaft 11, No. two shafts 12, guide rings 13.
Specific implementation mode
The present invention is described in further detail below in conjunction with the accompanying drawings and by embodiment, and following embodiment is to this hair
Bright explanation and the invention is not limited in following embodiments.
Embodiment.
Referring to Fig. 1 to Fig. 2, a kind of adjust automatically strengthens mixing and anti-blocking ammonia-spraying grid device, including flue gas stream simultaneously
Fast tracks of device 1,2, No. two levers 3 of No.1 lever, connecting component 4, nozzle degree adjustment valve 5, elastomeric element 6, connecting rod 7,
Support ring 8, nozzle 9, spray ammonia branch pipe 10,11, No. two shafts 12 of No.1 shaft and guide ring 13.
Flue gas flow rate tracks of device 1 and one end of No.1 lever 2 are rigidly connected, the nonelastic deformation in 500 DEG C.No.1 thick stick
The other end of bar 2 is connect by No.1 shaft 11 with spray ammonia branch pipe 10, and No.1 lever 2 can be rotated around No.1 shaft 11；No. two thick sticks
One end of bar 3 is connect by No. two shafts 12 with No.1 lever 2, and the other end of No. two levers 3 passes through connecting component 4 and connecting rod
7 connections；Connecting rod 7 is located at the inside of nozzle 9, connecting rod 7 sequentially pass through nozzle degree adjustment valve 5 and elastomeric element 6 and with branch
Pushing out ring 8 connects, and nozzle degree adjustment valve 5 is located on nozzle 9, and elastomeric element 6 is located in nozzle 9, one end of elastomeric element 6 and spray
Mouth degree adjustment valve 5 is adjacent and is fixed with the inner wall of nozzle 9, and the other end and the support ring 8 of elastomeric element 6 are fixed；Support ring 8 is
Hollow platy structure circulates for gas, and ammonia air Mixture is through-flow in guarantee nozzle 9.The setting of guide ring 13 is being sprayed
On the outer wall of mouth 9, No. two levers 3 run through round guide ring 13, and can the sliding in guide ring 13.Nozzle 9 and spray ammonia branch pipe 10
Connection, nozzle 9 are provided with several, several nozzles 9 are arranged in order on spray ammonia branch pipe 10；Nozzle 9 hangs down with spray ammonia branch pipe 10
Straight arrangement.Nozzle degree adjustment valve 5 is inverted cone-shaped structure, and in the state that nozzle 9 is opened, flue gas is along nozzle aperture regulation 5
Hole with 9 tube wall of nozzle can reinforce the mixing of ammonia and flue gas in cone injection outward.Nozzle degree adjustment valve 5
In the end of nozzle 9, nozzle degree adjustment valve 5 coordinates with nozzle 9.
A kind of adjust automatically as described above strengthens the spray ammonia method of mixing and anti-blocking ammonia-spraying grid device simultaneously, sprays ammonia
Method is as follows：Ammonia-spraying grid device and relevant device setting are located at flue before denitrating catalyst in SCR denitration system inlet
Interior, flue gas passes through ammonia-spraying grid device and related deflector, enters Benitration reactor after flow straightening grid.Flue gas is in flow process
Bump against with flue gas flow rate tracks of device 1, under the flow-disturbing effect of flue gas flow rate tracks of device 1, at flue gas flow rate tracks of device 1
Form vortex；Flue gas flow rate tracks of device 1 and No.1 lever 2 rotate under the promotion of flue gas around No.1 shaft 11, to drive
No. two levers 3 are rotated around No. two shafts 12, meanwhile, No. two levers 3 are moved with guide ring 13；In the effect of No. two levers 3
Under, it pulls connecting rod 7 to move by connecting component 4, to drive nozzle degree adjustment valve 5 to move, makes nozzle degree adjustment valve 5
It opens, the ammonia air Mixture in spray ammonia branch pipe 10 sprays and at the flue gas flow rate tracks of device 1 under the turbulent flow of flue gas
It is vigorously mixed with flue gas.
Flue gas flow rate tracks of device 1 and No.1 lever 2 rotate according to the difference of flue gas flow rate around No.1 shaft 11 different
Angle, each flue gas flow rate tracks of device 1 adjust accordingly nozzle degree adjustment valve 5 according to the flue gas flow rate of its position
Opening size, the flue gas flow rate ranging from 0-20m/s of response adjust each nozzle 9 to realize automatically according to flue gas flow rate
The purpose of aperture；Nozzle degree adjustment valve 5 completely closes when flue gas flow rate is 0m/s, and with the increase of flue gas flow rate, nozzle is opened
The aperture for spending regulating valve 5 increases, to realize automatic tracking adjustment of the ammonia spraying amount to flue gas flow rate.
Although the present invention is disclosed as above with embodiment, it is not limited to protection scope of the present invention, any to be familiar with
The technical staff of this technology changes and retouches made by without departing from the spirit and scope of the invention, should all belong to this hair
Bright protection domain.
Claims (10)
1. a kind of adjust automatically strengthen simultaneously mixing and anti-blocking ammonia-spraying grid device, which is characterized in that including flue gas flow rate with
Track device, No.1 lever, No. two levers, connecting component, nozzle degree adjustment valve, elastomeric element, connecting rod, support ring, nozzle,
Spray ammonia branch pipe, No.1 shaft, No. two shafts and guide ring；The flue gas flow rate tracks of device is connect with one end of No.1 lever,
The other end of the No.1 lever is connect by No.1 shaft with spray ammonia branch pipe；One end of No. two levers passes through No. two shafts
It is connect with No.1 lever, the other end of No. two levers is connect by connecting component with connecting rod；The connecting rod is located at spray
The inside of mouth, the connecting rod sequentially pass through nozzle degree adjustment valve and elastomeric element and are connect with support ring, and the nozzle is opened
Degree regulating valve is located on nozzle, and the elastomeric element is located in nozzle, one end and the nozzle degree adjustment valve of the elastomeric element
Adjacent and with nozzle inner wall is fixed, and the other end and the support ring of the elastomeric element are fixed；The guide ring is arranged in nozzle
Outer wall on, No. two levers run through guide ring；The nozzle is connected to spray ammonia branch pipe.
2. adjust automatically according to claim 1 strengthens mixing and anti-blocking ammonia-spraying grid device simultaneously, which is characterized in that
The nozzle is provided with several, several nozzles are arranged in order on spray ammonia branch pipe.
3. adjust automatically according to claim 2 strengthens mixing and anti-blocking ammonia-spraying grid device simultaneously, which is characterized in that
The nozzle is arranged vertically with spray ammonia branch pipe.
4. adjust automatically according to claim 1 strengthens mixing and anti-blocking ammonia-spraying grid device simultaneously, which is characterized in that
The flue gas flow rate tracks of device is rigidly connected with No.1 lever.
5. adjust automatically according to claim 1 strengthens mixing and anti-blocking ammonia-spraying grid device simultaneously, which is characterized in that
The nozzle degree adjustment valve is inverted cone-shaped structure, and the nozzle degree adjustment valve is located at the end of nozzle, the nozzle aperture
Regulating valve coordinates with nozzle.
6. adjust automatically according to claim 1 strengthens mixing and anti-blocking ammonia-spraying grid device simultaneously, which is characterized in that
The support ring is hollow platy structure, is circulated for gas.
7. a kind of adjust automatically as described in any one of claim 1-6 claims strengthens mixing and anti-blocking spray ammonia simultaneously
The spray ammonia method of grid device, which is characterized in that the spray ammonia method is as follows：Flue gas tracks in flow process with flue gas flow rate
Device bumps against, and vortex is formed at flue gas flow rate tracks of device；Flue gas flow rate tracks of device and No.1 lever pushing away in flue gas
It is rotated around No.1 shaft under dynamic, to drive No. two levers to be rotated around No. two shafts, meanwhile, No. two levers are moved with guide ring
It is dynamic；Under the action of No. two levers, connecting rod movement is pulled by connecting component, to drive nozzle degree adjustment valve to move,
So that nozzle degree adjustment valve is opened, sprays the ammonia air Mixture ejection in ammonia branch pipe and the flue gas at flue gas flow rate tracks of device
Turbulent flow under be vigorously mixed with flue gas.
8. adjust automatically according to claim 7 strengthens the spray ammonia method of mixing and anti-blocking ammonia-spraying grid device simultaneously,
It is characterized in that, the flue gas flow rate tracks of device and No.1 lever rotate difference according to the different of flue gas flow rate around No.1 shaft
Angle.
9. adjust automatically according to claim 8 strengthens the spray ammonia method of mixing and anti-blocking ammonia-spraying grid device simultaneously,
It is characterized in that, each flue gas flow rate tracks of device adjusts accordingly nozzle aperture according to the flue gas flow rate of its position
The opening size of regulating valve, the flue gas flow rate ranging from 0-20m/s of response are adjusted often to realize automatically according to flue gas flow rate
The purpose of a nozzle aperture.
10. adjust automatically according to claim 9 strengthens the spray ammonia method of mixing and anti-blocking ammonia-spraying grid device simultaneously,
It is characterized in that, when flue gas flow rate is zero, tight fit between nozzle degree adjustment valve and the inner wall of nozzle；With flue gas flow rate
Increase nozzle degree adjustment valve aperture increase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810464267.4A CN108543420B (en) | 2018-05-15 | 2018-05-15 | Automatic-adjustment ammonia spraying grid device capable of simultaneously strengthening mixing and blocking prevention and ammonia spraying method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810464267.4A CN108543420B (en) | 2018-05-15 | 2018-05-15 | Automatic-adjustment ammonia spraying grid device capable of simultaneously strengthening mixing and blocking prevention and ammonia spraying method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108543420A true CN108543420A (en) | 2018-09-18 |
| CN108543420B CN108543420B (en) | 2023-09-19 |
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| CN201810464267.4A Active CN108543420B (en) | 2018-05-15 | 2018-05-15 | Automatic-adjustment ammonia spraying grid device capable of simultaneously strengthening mixing and blocking prevention and ammonia spraying method thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5660656A (en) * | 1979-10-25 | 1981-05-25 | Ricoh Co Ltd | Nozzle direction regulating mechanism for liquid injector |
| CN101829498A (en) * | 2010-04-06 | 2010-09-15 | 东南大学 | Ammonia-spraying grille and design method thereof |
| CN203520711U (en) * | 2013-10-30 | 2014-04-02 | 田旭 | Energy conversion demonstration instrument |
| CN205745568U (en) * | 2016-05-24 | 2016-11-30 | 河北惠沧节能科技有限公司 | A kind of high-precision flow self-adjusting valve |
| CN206897179U (en) * | 2017-05-05 | 2018-01-19 | 华电电力科学研究院 | A kind of anti-blocking efficient ammonia-gas spraying device of adverse current for SCR denitration system ammonia-spraying grid |
| CN207153628U (en) * | 2017-08-15 | 2018-03-30 | 国电科学技术研究院 | SCR denitration system vortex mixer accumulatingdust device |
| CN208583181U (en) * | 2018-05-15 | 2019-03-08 | 华电电力科学研究院有限公司 | A kind of adjust automatically strengthens mixing and anti-blocking ammonia-spraying grid device simultaneously |
-
2018
- 2018-05-15 CN CN201810464267.4A patent/CN108543420B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5660656A (en) * | 1979-10-25 | 1981-05-25 | Ricoh Co Ltd | Nozzle direction regulating mechanism for liquid injector |
| CN101829498A (en) * | 2010-04-06 | 2010-09-15 | 东南大学 | Ammonia-spraying grille and design method thereof |
| CN203520711U (en) * | 2013-10-30 | 2014-04-02 | 田旭 | Energy conversion demonstration instrument |
| CN205745568U (en) * | 2016-05-24 | 2016-11-30 | 河北惠沧节能科技有限公司 | A kind of high-precision flow self-adjusting valve |
| CN206897179U (en) * | 2017-05-05 | 2018-01-19 | 华电电力科学研究院 | A kind of anti-blocking efficient ammonia-gas spraying device of adverse current for SCR denitration system ammonia-spraying grid |
| CN207153628U (en) * | 2017-08-15 | 2018-03-30 | 国电科学技术研究院 | SCR denitration system vortex mixer accumulatingdust device |
| CN208583181U (en) * | 2018-05-15 | 2019-03-08 | 华电电力科学研究院有限公司 | A kind of adjust automatically strengthens mixing and anti-blocking ammonia-spraying grid device simultaneously |
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| CN108543420B (en) | 2023-09-19 |
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