CN110307557A - The operation method of SCR gas bypass system and SCR gas bypass system - Google Patents
The operation method of SCR gas bypass system and SCR gas bypass system Download PDFInfo
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- CN110307557A CN110307557A CN201910588698.6A CN201910588698A CN110307557A CN 110307557 A CN110307557 A CN 110307557A CN 201910588698 A CN201910588698 A CN 201910588698A CN 110307557 A CN110307557 A CN 110307557A
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- flue gas
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- scr
- gas bypass
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- 238000000034 method Methods 0.000 title claims abstract description 26
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 83
- 239000003546 flue gas Substances 0.000 claims abstract description 83
- 239000007789 gas Substances 0.000 claims abstract description 58
- 239000003054 catalyst Substances 0.000 claims abstract description 34
- 230000008676 import Effects 0.000 claims abstract description 3
- 238000005259 measurement Methods 0.000 claims description 8
- 235000019504 cigarettes Nutrition 0.000 claims 1
- 239000007921 spray Substances 0.000 claims 1
- 238000001514 detection method Methods 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J11/00—Devices for conducting smoke or fumes, e.g. flues
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J13/00—Fittings for chimneys or flues
-
- 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
Abstract
The present invention provides the operation method of a kind of SCR gas bypass system and SCR gas bypass system.Wherein, SCR gas bypass system includes: the gas bypass for connecting economizer import and economizer exit；Flue gas nozzle in SCR device inlet flue duct；Arranged for interval is in multiple temperature-detecting devices on the first floor catalyst inlet section of SCR system；Control unit, gas bypass, flue gas nozzle and temperature-detecting device are connect with control unit, the working condition of temperature signal control gas bypass and flue gas nozzle that control unit is acquired according to temperature-detecting device.The present invention, which solves the problems, such as that SCR gas bypass system is unable to accurately control the uniformity of flue-gas temperature and minimum temperature on first floor catalyst inlet section in the prior art, to be allowed greater than catalyst using minimum temperature.
Description
Technical field
The present invention relates to technical field of environment protection equipment, in particular to a kind of SCR gas bypass system and SCR flue gas
The operation method of bypath system.
Background technique
In recent years, China is increasingly stringenter the pollutant emission aspect control of coal fired power plant, to reach " ultralow row
Put " in nitrogen oxides emission request, thermal power plant is provided with SCR system at present, and flue gas is injected into flue gas when by catalyst
Reducing agent NH3The N for generating environmental sound can be reacted under the effect of the catalyst with NOx2And H2O。
However, catalyst activity reaction temperature is generally at 320~420 DEG C, unit saves coal when 50% load operates above
Device exit gas temperature can satisfy service requirement substantially.But under the overall background of flexibility power generation and depth peak regulation, thermoelectricity
Unit is significantly increased lower than runing time under 50% load, this leads to first floor catalyst inlet section temperature minimum value and opposite
Standard deviation value is unable to satisfy condition, and the escaping of ammonia is caused to increase, denitration efficiency decline, a series of unit operations such as air preheater blocking
Problem.
For flue-gas temperature detection system, three temperature points are substantially set in economizer exit flue at present, this
Method still meets temperature measurement accuracy in the case where gas bypass system does not put into operation, but in underload gas bypass system
When putting into operation, the high-temperature flue gas of gas bypass and the low-temperature flue gas mixing of economizer exit are poor, and temperature difference is larger, depends merely on three
Temperature point is unable to satisfy measurement accuracy.
For existing SCR gas bypass system and method, because two kinds of flue gas temperature difference are larger, and density variation is larger,
In mixed process, the lower high-temperature flue gas of density is poor with main flume mixed effect readily along flue upper flow, depends merely on
Flow-disturbing or flow mixing device are difficult to make the high-temperature flue gas in bypass flue to be uniformly mixed with the low-temperature flue gas of mainstream.
It can be seen from the above, SCR gas bypass system existing in the prior art can not accurately control first floor catalyst inlet
The uniformity and bulk temperature of section temperature allow higher than catalyst using minimum temperature.
Summary of the invention
The main purpose of the present invention is to provide the operation sides of a kind of SCR gas bypass system and SCR gas bypass system
Method, to solve the uniformity that SCR gas bypass system in the prior art is unable to control first floor catalyst inlet section flue-gas temperature
And bulk temperature allows higher than catalyst using minimum temperature.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of SCR gas bypass system, comprising:
Connect the gas bypass of economizer import and economizer exit；It is connected to the flue gas of each branch road of economizer exit end gas bypass
Nozzle is located in SCR device inlet flue duct；Arranged for interval is in multiple temperature on the first floor catalyst inlet section of SCR system
Detection device；Control unit, gas bypass, flue gas nozzle and temperature-detecting device are connect with the control unit, control unit according to
The working condition of temperature signal the control gas bypass and flue gas nozzle of temperature-detecting device acquisition.
Further, total flow valve and each bypass flow valve are provided with flowmeter, measure actual flow value in real time.
Further, flue gas nozzle includes telescopic end, top rotation section, rotating middle part section and end rotation section, telescopic segment
Concentrically line is flexibly connected with top rotation section, and top rotates section and rotating middle part section is flexibly connected, and connects section and top
The center line of rotation section and rotating middle part section is in 60 ° of angles, and rotating middle part section and end rotation section are flexibly connected, and are connected and cut
The center line of face and rotating middle part section and end rotation section is in 60 ° of angles.Nozzle operation posture can be arbitrarily adjusted in flue.
According to another aspect of the present invention, a kind of operation method of SCR gas bypass system is provided, by SCR flue gas
Road system is above-mentioned SCR gas bypass system, and operation method includes: multiple temperature-detecting devices of SCR gas bypass system
The temperature in first floor catalyst inlet section is acquired evenly and at intervals；The processing unit of the control unit of SCR gas bypass system according to
The temperature of temperature-detecting device acquisition and the flue gas flow of SCR system are received, determines the aperture of total flow valve, each bypass flow
The operation posture of the aperture of valve and each flue gas nozzle.
Further, the flow that processing unit is measured according to mass flow meters further adjusts the aperture of total flow valve.
Further, in determining the step of flue gas nozzle runs posture, processing unit is measured according to temperature-detecting device
Temperature determine first floor catalyst inlet section temperature isogram.
Further, in determining the step of flue gas nozzle runs posture, according to obtained first floor catalyst inlet section
Temperature isogram calculates the minimum value and relative standard deviation value of the temperature in the section, and with preset temperature minimum value and phase
Standard deviation value is compared, with the operation posture of the determination flue gas nozzle.
Further, during being compared actual temperature with preset temperature, if the minimum value of actual temperature is small
When the minimum value of preset temperature, start the operation posture for adjusting each flue gas nozzle；If and/or the relative standard of actual temperature is inclined
When difference is more than or equal to the relative standard deviation value of preset temperature, start the operation posture for adjusting each flue gas nozzle.
Further, operation method further includes determining opening for each bypass flow valve according to obtained Temperature Distribution isogram
Degree.
Further, the flow that processing unit is measured according to bypass flow further adjusts the aperture of bypass flow valve.
Further, when the aperture of total flow valve, the operation posture of the aperture of each bypass flow valve and each flue gas nozzle
After adjustment, processing unit determines current Temperature Distribution isogram according to the temperature that Current Temperatures detection device acquires,
The storage element of SCR system stores Current Temperatures distribution isogram.
Further, operation method further include: processing unit is opened Current Temperatures distribution isogram and total flow valve
The Temperature Distribution isogram obtained before the operation pose adjustment of degree, the aperture of each bypass flow valve and each flue gas nozzle carries out
Compare, to determine the aperture of total flow valve, the operation posture of the aperture of each bypass flow valve and each flue gas nozzle.
Apply the technical scheme of the present invention, the SCR gas bypass system in the application include: gas bypass, flue gas nozzle,
Multiple temperature-detecting devices and control unit.Flue gas nozzle is located in SCR flue；Multiple temperature-detecting devices are arranged at intervals on head
On layer catalyst inlet section；Gas bypass, flue gas nozzle and temperature-detecting device are connect with control unit, and control unit is according to temperature
Spend the working condition of temperature signal the control gas bypass and flue gas nozzle of detection device acquisition.
Using above structure SCR gas bypass system when, can first pass through be arranged on first floor catalyst inlet section
Multiple temperature-detecting devices the flue-gas temperature on first floor catalyst inlet section be specifically distributed measure, and will measure
Temperature signal be sent to control unit；Control unit can be handled the temperature signal of measurement, and according to the resulting number of processing
It is controlled according to total flow valve, each bypass flow valve and the flue gas nozzle to gas bypass.So as in gas bypass system
During adjustment, by the control of control unit, the variation of total flow valve opening is realized, the aperture of each bypass flow valve is not
Together, the operation posture of each flue gas nozzle is different.So as to according to the flue-gas temperature signal on first floor catalyst inlet section come
Judge whether the requirement for meeting catalyst normal use, so adjusted according to the otherness of Temperature Distribution each bypass flow valve and
The working condition of flue gas nozzle.It simultaneously can also be according to temperature-detecting device to the flue-gas temperature on first floor catalyst inlet section
Carry out real-time monitoring.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of SCR gas bypass system of the present invention；
Fig. 2 is flue gas nozzle arrangements schematic diagram in the present invention；
Fig. 3 is arrangement schematic diagram of the temperature-detecting device on first floor catalyst in the present invention.
Wherein, the above drawings include the following reference numerals:
10, first floor catalyst；20, temperature-detecting device；30, control unit；31, signal processor；32, processing unit；33,
Operation data library；40, mass flow meters；50, total flow valve；60, gas bypass；70, bypass flow valve；80, bypass flow meter；
90, flue gas nozzle；91, telescopic end；92, top rotates section；93, rotating middle part section；94, end rotates section.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
It should be pointed out that unless otherwise specified, all technical and scientific terms used in this application have and the application
The normally understood identical meanings of person of an ordinary skill in the technical field.
In the present invention, in the absence of explanation to the contrary, the noun of locality used is usually directed to attached drawing as " upper and lower "
Shown in for direction, or for component itself is on vertical, vertical or gravity direction；Similarly, for just
In understanding and describing, " inside and outside " refers to the inside and outside of the profile relative to each component itself, but the above-mentioned noun of locality is not used to limit
The system present invention.
As shown in Figures 1 to 3, the SCR gas bypass system according to embodiments of the present invention, comprising:
Temperature-detecting device 20, the temperature of flue gas on 10 entrance section of real-time measurement first floor catalyst；
Signal processor 31 for receiving the temperature signal of the measurement of temperature-detecting device 20, and the temperature signal is sent out
It gives connected processing unit 32 and carries out information sharing；
Processing unit 32, for receiving above-mentioned real time temperature signal；
Total flow valve 50 for receiving the adjustment signal of processing unit 32, and is adjusted in synchronism the aperture of total flow valve 50；
Mass flow meters 40 bypass flue gas total flow for real-time monitoring, and synchronous feedback is to processing unit；
Bypass flow valve 70 for receiving the adjustment signal of processing unit 32, and is adjusted in synchronism each bypass flow valve 70
Aperture；
Bypass flow meter 80 bypasses flue gas flow for each branch of real-time monitoring, and synchronous feedback is to processing unit；
Flue gas nozzle 90 for receiving the adjustment signal of processing unit 32, and is adjusted in synchronism each flue gas nozzle 90 in SCR
Operation posture in flue；
Operation data library 33, for storing device per treatment according to SCR system under measurement temperature signal and different boiler loads
The adjusting behavior of total flow valve 50, bypass flow valve 70 and flue gas nozzle 90 that system flue gas flow is made.
Optionally, temperature-detecting device 20 can be thermocouple.Control unit 30 includes signal processor 31, processing unit
32, operation data library 33.Wherein, processing unit 32 can be central processing unit.
In this embodiment, multiple temperature-detecting devices 20 measure 10 entrance section temperature of first floor catalyst, signal processing
Device 31 is by temperature signal Real-Time Sharing to processing unit 32, and processing unit 32 is according to temperature signal real-time rendering first floor catalyst 10
The temperature isogram of flue gas on entrance section, and calculate the minimum value t of temperature on sectionminWith relative standard deviation value Cv, meter
It is shown to calculate formula such as (1)~(2):
Wherein, tiThe temperature value measured for several measuring points；For section measuring point data average value；N is section measuring point quantity.
Specifically, what temperature-detecting device 20 was arranged is more intensive, and 10 entrance section temperature isogram of first floor catalyst is got over
Precisely.
Work as tminAnd CvMiddle any value reaches setting value, starts adjustment behavior.
Adjustment behavior mainly includes following three parts:
(1) other according to the aperture of SCR system flue gas total flow and economizer inlet and outlet flue-gas temperature adjustment total flow valve 50
Shown in road flue gas total flow such as formula (3)~(4):
G1=G2+G3 (3)
Wherein, G1For SCR system flue gas total flow；G2To bypass flue gas total flow；G3For mainstream flue gas flow；t1To save
Coal device input gas temperature；t2For economizer input gas temperature；T' is default 10 entrance section flue-gas temperature of first floor catalyst.
Specifically, 40 real-time measurement gas bypass of mass flow meters, 60 total flow, and feed back to processing unit 32, processing unit
32 flows measured according to mass flow meters 40 further adjust the aperture of total flow valve 50.
(2) the 10 entrance section temperature isogram of first floor catalyst drawn according to processing unit, adjusts each bypass flow
The aperture of valve 70, shown in each branch flue gas flow such as formula (5):
Gi=Ait(x,y) (5)
Wherein, GiFor each branch flue gas flow；AiFor the functional relation between each branch flue gas flow and temperature isogram.
Specifically, the flue gas flow of each branch of each 80 real-time measurement of bypass flow meter, and processing unit 32 is fed back to, it handles
Unit 32 further adjusts the aperture of each flow valve 70 according to the flue gas flow of each branch.
(3) the 10 entrance section temperature isogram of first floor catalyst drawn according to processing unit, adjusts each branch flue gas
The operation posture of nozzle 90, shown in the operation posture such as formula (6) of each branch flue gas nozzle 90:
Pi=Bit(x,y) (6)
Wherein, PiFor the Adjusted Option of each branch flue gas nozzle 90；BiFor the Adjusted Option and temperature of each branch flue gas nozzle 90
Spend the functional relation between isogram.
Specifically, flue gas nozzle 90 is after the Adjusted Option for receiving the sending of processing unit 32, by extending or contracting up and down
Short 91 length of telescopic end, rotation top rotation section 92, rotating middle part section 93, end rotate section 94 to adjust flue gas nozzle in SCR
Posture in flue.
Specifically, the functional relation A that can will be all established during adjustment after adjusting each timeiAnd BiIt is stored in operation data
It, can be according to being stored in operation data library 33 functional relation and adjust every time when 32 each generating function relationship of processing unit in library 33
Temperature Distribution isogram after whole is constantly corrected.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (14)
1. a kind of SCR gas bypass system characterized by comprising
Gas bypass (60), gas bypass (60) the connection economizer import and economizer exit；
Flue gas nozzle (90), the flue gas nozzle (90) are connected to each branch road of economizer exit end gas bypass (60), position
In in SCR device inlet flue duct；
Multiple temperature-detecting devices (20), multiple temperature-detecting device (20) arranged for interval are in the first floor of the SCR system
On catalyst (10) entrance section；
Control unit (30), the gas bypass (60), the flue gas nozzle (90) and the temperature-detecting device (20) are and institute
Control unit (30) connection is stated, the control unit (30) is according to the temperature signal control that the temperature-detecting device (20) acquires
The working condition of gas bypass (60) and the flue gas nozzle (90).
2. gas bypass system according to claim 1, which is characterized in that gas bypass (60) the economizer input end
Equipped with total flow valve (50) and mass flow meters (40), gas bypass (60) the economizer exit end is divided into multiple branches, multiple
The branch is respectively equipped with bypass flow valve (70) and bypass flow meter (80).
3. gas bypass system according to claim 1, which is characterized in that the flue gas nozzle (90) includes telescopic segment
(91), top rotation section (92), rotating middle part section (93) and end rotation section (94), the telescopic segment (91) and top rotation
Turning section (92), concentrically line is flexibly connected, and top rotation section (92) and the rotating middle part section (93) are flexibly connected, and even
The center line for connecing section and top rotation section (92) and the rotating middle part section (93) is in 60 ° of angles, the middle part rotation
Turn section (93) and end rotation section (94) is flexibly connected, and connects section and the rotating middle part section (93) and the end
The center line for rotating section (94) is in 60 ° of angles.
4. gas bypass system according to claim 3, which is characterized in that the telescopic segment (91) can be along center line side
To upper and lower collapsing length, top rotation section (92) can be rotated freely along the junction with the telescopic segment (91), it is described in
Portion's rotation section (93) can be rotated freely along the junction with top rotation section (92), end rotation section (94) can along with
The junction of the rotating middle part section (93) rotates freely.
5. a kind of operation method of SCR gas bypass system, which is characterized in that the SCR gas bypass system is claim 1
To SCR gas bypass system described in any one of 4, the operation method includes:
The difference of multiple temperature-detecting devices (20) acquisition first floor catalyst (10) entrance section of the SCR gas bypass system
The temperature of position；
The processing unit (32) of the control unit (30) of the SCR gas bypass system receives multiple temperature-detecting devices (20)
The temperature measured determines total flow valve (50) aperture, the operation of each bypass flow valve (70) aperture and each flue gas nozzle (90)
Posture；
Position of each flue gas nozzle (90) of the SCR gas bypass system according to the operation pose adjustment in flue.
6. operation method according to claim 5, which is characterized in that the processing unit (32) is according to the total cigarette of SCR system
Throughput and the temperature of the temperature-detecting device (20) measurement determine total flow valve (50) aperture.
7. operation method according to claim 6, which is characterized in that the processing unit (32) is according to mass flow meters (40)
The flow measured further adjusts the aperture of total flow valve (50).
8. operation method according to claim 5, which is characterized in that in determining flue gas nozzle (90) the operation posture
In step, the processing unit (32) determines that first floor catalyst (10) enters according to the temperature that the temperature-detecting device (20) measures
Mouth section temperature isogram.
9. operation method according to claim 8, which is characterized in that in determining flue gas nozzle (90) the operation posture
In step, according to obtained first floor catalyst (10) entrance section temperature isogram calculate the temperature in the section minimum value and
Relative standard deviation value, and be compared with preset temperature minimum value and relative standard deviation value, with the determination flue gas spray
The operation posture of mouth (90).
10. operation method according to claim 9, which is characterized in that by the actual temperature and the preset temperature
During being compared,
If the minimum value of the actual temperature is less than the minimum value of the preset temperature, start to adjust each flue gas nozzle
(90) operation posture；And/or
If the relative standard deviation value of the actual temperature is more than or equal to the relative standard deviation value of the preset temperature, start
Adjust the operation posture of each flue gas nozzle (90).
11. the operation method according to any one of claim 6 to 10, which is characterized in that the operation method further includes
The aperture of each bypass flow valve (70) is determined according to obtained Temperature Distribution isogram.
12. operation method according to claim 11, which is characterized in that the processing unit (32) is according to each bypass flow
The flow that meter (80) measures further adjusts the aperture of each bypass flow valve (70).
13. operation method according to claim 12, which is characterized in that when total flow valve (50) aperture, each branch
After the operation pose adjustment of flow valve (70) aperture and each flue gas nozzle (90), the processing unit (32) is according to current
The temperature of temperature-detecting device (20) acquisition determines current Temperature Distribution isogram, the operation data library (33)
Storage element stores Current Temperatures distribution isogram.
14. operation method according to claim 13, which is characterized in that the operation method further include:
The Current Temperatures are distributed isogram and total flow valve (50) aperture, each branch stream by the processing unit (32)
The Temperature Distribution isogram obtained before the operation pose adjustment of amount valve (70) aperture and each flue gas nozzle (90) carries out
Compare, with determination total flow valve (50) aperture, the operation of each bypass flow valve (70) aperture and each flue gas nozzle (90)
Posture.
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| CN201910588698.6A CN110307557A (en) | 2019-07-02 | 2019-07-02 | The operation method of SCR gas bypass system and SCR gas bypass system |
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| CN201910588698.6A CN110307557A (en) | 2019-07-02 | 2019-07-02 | The operation method of SCR gas bypass system and SCR gas bypass system |
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Cited By (1)
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| CN110935312A (en) * | 2019-12-16 | 2020-03-31 | 广州珠江电力有限公司 | Dynamic monitoring device and dynamic monitoring method for SCR flue gas denitration system |
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