CN106422732A - Thermal power plant W type boiler SNCR denitration system and control method thereof - Google Patents
Thermal power plant W type boiler SNCR denitration system and control method thereof Download PDFInfo
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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
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
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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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0623—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the set value given to the control element
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
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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
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Abstract
The invention discloses a thermal power plant W type boiler SNCR denitration system and a control method thereof. The system comprises long spray guns, a plurality of short spray guns, a laser detection system, a metering module and distribution modules, wherein the long spray guns are arranged in a W type boiler horizontal flue area, the short spray guns are arranged in a W type boiler furnace arch area in layers, and the metering module and the distribution module are sequentially connected. The method includes the steps that a CO concentration signal obtained through the laser detection system adjusts the concentration of a urea solution through the metering module; a temperature distribution signal obtained through the laser detection system adjusts the flow of the urea solution sprayed by each long spray gun through a long spray gun distribution module; the number of operation layers of the short spray guns and the total flow of the urea solution of each layer are controlled according to a unit load interval and an NSR value. The long spray guns provided with multiple nozzles extend into a flue, the sprayed urea solution can completely cover the section of the flue, it is guaranteed that the urea solution and flue gas are sufficiently and evenly mixed, denitration efficiency is improved, and a control mode is simple and easy to implement.
Description
Technical field
The present invention relates to thermal power plant's SNCR denitration technology, specially a kind of thermal power plant W type boiler SNCR denitration system and its
Control method.
Background technology
W flame boiler, in low volatile coal, has that low-load combustion-stabilizing ability is strong, combustion stability is good, band is negative
Lotus performance is strong, reliable the features such as, therefore W flame boiler has become in China and has used the low volatilization such as anthracite or meager coal inferior
Divide main force's type of furnace of coal, but it has the high problem of NOx discharge in actual motion.In the face of NOx emission concentration 50mg/
m3Ultra-clean emission request, simple transformation SCR denitration system is not only invested higher with operating cost, also affects the peace of unit simultaneously
Quan Xing.From technology and many-sided considerations such as economic angle, increase SNCR denitration device on the basis of making full use of former SCR device
It is the reasonable selection realizing W type boiler nitrogen oxides minimum discharge.
SNCR method (SNCR) gas denitrifying technology be station boiler, fluidized-bed combustion boiler, cement kiln and
The mainstream technology of flue gas of refuse burning denitration.In 880 DEG C of -1050 DEG C of temperature ranges, under no catalysts conditions, spray into ammonia
Or the amino reductive such as carbamide, the NOx in flue gas is optionally reduced into harmless nitrogen and water.SNCR technique is with burner hearth
For reactor, can be by realizing to the transformation of boiler, the construction period is short, cost of investment and operating cost and other denitrating flue gas skills
It is all that ratio is relatively low that art is compared, and is suitable for the transformation to medium small boiler.Modern SNCR technology can control NOx emission reduce by 20～
50%, increase with unit capacity, size of burner hearth and unit load excursion expand, and increased reaction temperature window and reduction
Agent mixed uniformly control difficulty, causes denitration efficiency to reduce.For 600MW unit, it is less than 10 μ L/ controlling ammonia slip concentration
Under the conditions of L, denitration efficiency only 30% about.Generally higher due to using anthracitic W type boiler NOx initial concentration, for protecting
Card NOx emission reaches 50mg/m3, the denitration efficiency of SNCR section must reach more than 45%, therefore research and develop efficient thermoelectricity
Factory W type boiler SNCR denitration system is extremely urgent.
The denitration efficiency of SNCR be subject to temperature, CO concentration, NOx initial value, NSR, burning condition, coal, the type of furnace, the escaping of ammonia etc. because
The impact of element, wherein temperature and CO concentration are two major influence factors.For improving SNCR technique denitration efficiency, correlational study carries
Go out the method using controlling ammonia nitrogen ratio under different load to adjust reduction agent flux, as disclosed in Chinese patent CN105169917A
A kind of SNCR-SCR combined denitration system and method based on the detection of ammonia nitrogen mol ratio and regulation and control, Chinese patent
A kind of SNCR SNCR response system, Chinese patent disclosed in CN201520543068.4
The ammonia spraying amount control method of SNCR flue gas denitrification system in a kind of manufacture of cement disclosed in CN201510188180.5, but this control
Method processed extremely complex it is difficult in engineering realize.In addition research is had to be distributed by measurement temperature to control spray gun by reducing agent
It is injected in the temperature province of suitable SNCR reaction, realize the dynamic tracking to each SNCR spray gun temperature window, such as China specially
A kind of point-to-point spraying system of efficient SNCR disclosed in sharp CN104307347A, and for example disclosed in Chinese patent CN104117279A
A kind of station boiler SNCR denitration control system and its control method, the difficult point of this control method is that spray gun quantity is more, right
Every spray gun carries out precise control and will dramatically increase system cost.CO concentration in flue gas be impact SNCR denitration efficiency important because
Element, result of study shows, when CO concentration is less than 1000ppm, SNCR denitration efficiency increases with CO concentration and increases；When CO concentration
During more than 1000ppm, SNCR denitration efficiency increases with CO concentration and reduces.Because CO concentration in flue gas is difficult to survey online
Amount, generally ignores the impact of CO concentration in current SNCR control system, and this also becomes the important of restriction SNCR denitration efficiency
Reason.
Content of the invention
For problems of the prior art, the present invention provide a kind of thermal power plant W type boiler SNCR denitration system and its
Control method, out of stock efficiency high, control simple, transformation is convenient.
The present invention is to be achieved through the following technical solutions：
A kind of thermal power plant W type boiler SNCR denitration system, including the long spray gun being arranged on W type boiler horizontal gas pass region,
Divide the multiple short spray gun of multilamellar setting in W type boiler furnace arch, furnace nose region, and laser detection system and the metering mould being sequentially connected
Block and distribute module；Distribute module includes the long spray gun distribute module of the outfan long spray gun of connection and outfan connects short spray gun
Short spray gun distribute module；Metering module input for controlling urea concentration connects crude urine element solution reservoir respectively and removes
Brine reservoir, outfan connects long spray gun distribute module and short spray gun distribute module respectively；Described laser detection system includes
Central control cabinet, diode laser, fibre multiplexer, optical fiber and the multigroup laser instrument being sequentially connected；Central control cabinet
For flue-gas temperature distribution signal and CO concentration signal are detected by laser instrument；Its outfan connects long spray respectively through engineer station
Rifle distribute module and metering module；Multiple long spray guns are in uniformly multi-tier arrangement on the cross section of horizontal flue, and long spray gun divides
Join the urea liquid flow that module controls each long lance ejection respectively according to the control signal of engineer station；Every layer short spray gun
Urea liquid entrance one electrically operated valve is set, short spray gun distribute module is according to the unit load of W type boiler and NSR value
Control every layer of electrically operated valve aperture.
Preferably, long spray gun is provided with six altogether, and is in uniformly three layers of arrangement on the cross section of horizontal flue, long spray
Four groups of laser instrument are uniformly arranged on the section of rifle place；Laser instrument and long spray gun interval setting；Every group of laser instrument includes a transmitting
End and a receiving terminal, transmitting terminal connects optical fiber, and receiving terminal connects central control cabinet.
Preferably, long spray gun cools down the outfan that end entrance connects desalination water storage tank, and colling end outlet connects demineralized water storage
The input of tank.
Preferably, also include compressed air reservoir, the outfan of compressed air reservoir is respectively used to cooling air and is connected to
The cooling end entrance of short spray gun, is connected between metering module and distribute module for atomizing air.
Preferably, described metering module includes blender, and the control valve being separately positioned on blender two entrances
And effusion meter；The outfan of crude urine element solution reservoir and desalination water storage tank is passed through fluid filling pump respectively and is connected with corresponding mixer entrance
Connect.
Preferably, every short spray gun arranges a manually-operated gate, and all manually-operated gate apertures are consistent.
A kind of thermal power plant W type boiler SNCR denitration control method, based on a kind of thermal power plant W type boiler of the present invention
In SNCR denitration system, including,
The step that urea concentration is adjusted by metering module according to the CO concentration signal that laser detection system obtains；
Each long spray gun spray is adjusted by long spray gun distribute module according to the temperature distribution signal that laser detection system obtains
The step of the urea liquid flow penetrated；
Step according to unit load interval put into operation with the NSR value short spray gun of the control number of plies and every layer of urea liquid total flow.
Preferably, the step adjusting urea concentration is specific as follows,
Laser detection system obtains the CO concentration signal in horizontal flue using TDLAS measuring method, and CO concentration signal exists
It is converted into a road valve opening signal in engineer station and sends in metering module, adjust the opening of control valve of desalination water loop
Degree, thus control the urea concentration of long lance ejection；
Raise with CO concentration, increase desalination discharge；Reduce with CO concentration, reduce desalination discharge.
Preferably, the step adjusting the urea liquid flow of each long lance ejection is specific as follows,
Laser detection system obtains the temperature distribution signal of flue gas in horizontal flue using TDLAS measuring method, and temperature is divided
Cloth signal is converted into multi-way valve opening amount signal in engineer station and sends in long spray gun distribute module, adjusts each long spray
The aperture of rifle control valve, thus control the urea liquid flow of every long lance ejection.
Preferably, control short spray gun put into operation the number of plies and every layer of urea liquid total flow step specific as follows,
Short spray gun point two-layer is arranged on W type boiler furnace arch, furnace nose region, is the short spray gun of ground floor and second from the bottom up successively
The short spray gun of layer；
When the unit of W type boiler is underload, the short spray gun of the ground floor that puts into operation, the short spray gun of the second layer cuts out, and according to NSR
Value adjusts the aperture of ground floor valve；
When the unit of W type boiler is middle load, the two-layer that simultaneously puts into operation spray gun, and two-layer valve is adjusted according to NSR value
Aperture；
When the unit of W type boiler is high load capacity, put into operation second layer spray gun, and the short spray gun of ground floor cuts out, and according to NSR value
Adjust the aperture of second layer valve.
Compared with prior art, the present invention has following beneficial technique effect：
The present invention stretches in the middle part of flue by arranging the long spray gun of multiple nozzles, and the urea liquid of long lance ejection can be complete
Cover flue cross section it is ensured that urea liquid fully, is uniformly mixed with flue gas, improve denitration efficiency；Long spray gun is entered using demineralized water
Row cooling, cooling water reusable edible, reduces operating cost.Arrange multigroup laser detector in long spray gun region simultaneously,
The distribution of measurement flue-gas temperature and CO concentration simultaneously, and according to every long spray gun urea liquid stream of temperature distribution signal real-time adjustment
Amount, according to CO concentration signal real-time adjustment desalination discharge, thus ensureing that the denitrification reducing agent spraying into is in optimum reaction condition,
Improve SNCR system denitration efficiency.Short spray gun urea liquid flow adopts every layer of centralized Control, according to unit load range restraint
The number of plies that puts into operation and every layer of urea liquid total flow, and it is evenly distributed to every spray gun, control mode is simple, easily realization.
Brief description
Fig. 1 is W type boiler SNCR denitration system of the present invention.
Fig. 2 is long gun controls loop in denitrating system of the present invention.
In figure：Long spray gun 1, short spray gun 2, urea liquid storage tank 3, desalination water storage tank 4, metering module 6, blender 61, point
Join module 7, long spray gun distribute module 71, central control cabinet 81, diode laser 82, fibre multiplexer 83, optical fiber 84,
Transmitting terminal 85, receiving terminal 86, engineer station 9, W type boiler 10.
Specific embodiment
With reference to specific embodiment, the present invention is described in further detail, described be explanation of the invention and
It is not to limit.
A kind of present invention thermal power plant W type boiler SNCR denitration system, as shown in figure 1, it includes being arranged on W type boiler 10 water
The long spray gun 1 in flat flue region, divides the multiple short spray gun 2 of multilamellar setting in W type boiler 10 furnace arch, furnace nose region, and laser detection
System and the metering module 6 being sequentially connected and distribute module 7；The long spray gun that distribute module 7 includes the outfan long spray gun 1 of connection divides
Join module 71 and outfan connects the short spray gun distribute module of short spray gun 2；Metering module 6 for controlling urea concentration is defeated
Enter end and connect crude urine element solution reservoir 3 and desalination water storage tank 4 respectively, outfan connects long spray gun distribute module 71 and short spray respectively
Rifle distribute module 72；Central control cabinet 81 that described laser detection system includes being sequentially connected, diode laser 82, optical fiber
Multiplexer 83, optical fiber 84 and multigroup laser instrument；Central control cabinet 81 is used for detecting flue-gas temperature distribution letter by laser instrument
Number and CO concentration signal；Its outfan connects long spray gun distribute module 71 and metering module 6 respectively through engineer station 9；Multiple length
Spray gun 1 is in uniformly multi-tier arrangement on the cross section of horizontal flue, and long spray gun distribute module 71 is according to the control of engineer station 9
Signal controls the urea liquid flow of each long spray gun 1 injection respectively；The urea liquid entrance setting of every layer short spray gun 2
One electrically operated valve, short spray gun distribute module 72 controls every layer of electrodynamic valve according to the unit load of W type boiler 10 and NSR value
Door.Wherein, also include compressed air reservoir 5, the outfan of compressed air reservoir 5 is respectively used to cooling air and is connected to short spray gun
2 cooling end entrance, is connected between metering module 6 and distribute module 7 for atomizing air.Central control cabinet 81 is used for detecting
With process laser signal；Fibre multiplexer 83 is used for the coupling of two wave band of laser signals；Diode laser 82 generates
Laser signal；Optical fiber 84 transmits laser signal；Preferably laser detector also includes the protection for purging and pneumatic decoking
Device.
In this preferred embodiment, as shown in Fig. 2 long spray gun 1 is provided with six altogether, and on the cross section of horizontal flue uniformly
In three layers arrange, long spray gun 1 place section is uniformly arranged four groups of laser instrument；Laser instrument and long spray gun 1 interval setting；Every group
Laser instrument includes a transmitting terminal 85 and a receiving terminal 86, and transmitting terminal 85 connects optical fiber 84, and receiving terminal 86 connects central control
Cabinet 81.
In this preferred embodiment, long spray gun 1 cools down the outfan that end entrance connects desalination water storage tank 4, and colling end outlet connects
The input of desalination water storage tank 4.Metering module 6 includes blender 61, and the control being separately positioned on blender 61 two entrances
Valve processed and effusion meter；The outfan of crude urine element solution reservoir 3 and desalination water storage tank 4 passes through fluid filling pump and corresponding blender respectively
61 entrances connect.
A kind of present invention thermal power plant W type boiler SNCR denitration control method, including the CO being obtained according to laser detection system
The step that concentration signal adjusts urea concentration by metering module 6；Believed according to the Temperature Distribution that laser detection system obtains
The step number adjusting the urea liquid flow of each long spray gun 1 injection by long spray gun distribute module 71；According to unit load area
Between and the NSR value short spray gun 2 of control put into operation the step of the number of plies and every layer of urea liquid total flow.Preferably, short 2 points of two-layers of spray gun set
Put in W type boiler 10 furnace arch, furnace nose region, be the short spray gun of ground floor and the short spray gun of the second layer from the bottom up successively.
Wherein, laser detection system obtains the CO concentration signal in horizontal flue using TDLAS measuring method, and CO concentration is believed
Number it is converted into a road valve opening signal in engineer station 9 and sends in metering module 6, adjust the control of desalination water loop
The aperture of valve, thus control the urea concentration of long spray gun 1 injection.
Wherein, laser detection system obtains the temperature distribution signal of flue gas in horizontal flue using TDLAS measuring method, temperature
Degree distribution signal is converted into multi-way valve opening amount signal in engineer station 9 and sends in long spray gun distribute module 71, adjusts
The aperture of each long spray gun 1 control valve, thus control the urea liquid flow of every long spray gun 1 injection.
In the present invention, concrete arrangement and control are as follows.
1) as shown in figure 1, six long spray guns divide three layers to be arranged in W type boiler horizontal gas pass region, the injection urine in flue gas
Plain solution.Long spray gun stretches into flue center and comprises multiple spouts, and the urea liquid of injection can cover whole flue cross section.Long spray
Rifle adopts desalination water cooling, cooling water circulation utilization.
2) as shown in figure 1, dividing two-layer to arrange branched short spray gun in W type boiler furnace arch, furnace nose region, stretch into spray at about 1 meter in stove
Penetrate urea liquid.Short spray gun is cooled down using compressed air, and cooling air is directly blown in burner hearth.
3) as shown in Fig. 2 arranging four groups of laser instrument in long spray gun place section, every group of laser instrument comprise a transmitting terminal and
One receiving terminal.The laser beam of the specific wavelength that transmitting terminal is sent passes through receiving end collection after boiler, in being then fed into
In the switch board of centre, the ratio not absorbing light and absorbed light line is measured by central control cabinet, so that it is determined that flue-gas temperature distribution
And CO concentration.Flue-gas temperature distribution signal is converted into six tunnel valve opening signals in engineer station and sends into long spray gun distribution
Module, adjusts the aperture of electrically operated valve in each long spray gun loop, thus controlling the urea liquid flow of every long lance ejection.
CO concentration signal is converted into a road valve opening signal in engineer station and sends into metering module, adjusts desalination water loop electricity
The aperture of movable valve, thus controlling the urea concentration of long lance ejection, specially raising with CO concentration, increasing demineralized water
Flow；Reduce with CO concentration, reduce desalination discharge.
4) short spray gun urea liquid flow adopts every layer of centralized Control, is put into operation the number of plies and every according to unit load range restraint
Layer urea liquid total flow, and it is evenly distributed to every short spray gun.The urea liquid entrance being specially every layer short spray gun sets
One electrically operated valve, valve opening is adjusted according to unit load.When unit is for underload, for example, reach fully loaded 50%,
The short spray gun of the ground floor that puts into operation, the short spray gun of the second layer cuts out, and adjusts the aperture of ground floor valve according to NSR value；In unit is
During load, for example, reach fully loaded 75%, the short spray gun of the two-layer that simultaneously puts into operation, and the aperture of two-layer valve is adjusted according to NSR value；
When unit is for high load capacity, for example, reach fully loaded 100%, the short spray gun of the second layer that puts into operation, the short spray gun of ground floor cuts out, and root
Adjust the aperture of second layer valve according to NSR value.Every short spray gun arranges a manually-operated gate, and all manually-operated gate apertures keep
Unanimously.
Wherein, laser detection system adopts TDLAS (Tunable Diode Laser Absorption
Spectroscopy, tunable diode laser can absorb spectrum) technology, collect two wavelength lasers in an optical fiber, then make
The light sending sequentially passes through the horizontal flue section of W type boiler.Receptor collection light after passed back central control cabinet, by
Ratio the light quantity that centre switch board is absorbed to benchmark light quantity and the measured matter molecule of the specific wavelength through boiler is entered
Row compares, so that it is determined that the concentration of each measurand, gas temperature is then according to two CO2The ratio of characteristic absorpting spectruming line is surveying
Amount.Emitter and receptor, can be joined from dynamic(al) correction to guarantee also to obtain optimal light quantity transmission in boiler disturbance simultaneously
There are instrument air-blowing sweeping device and pneumatic coke removing appts, to ensure the unimpeded of exploration hole.In the present invention, in the two ends of horizontal flue dress
There are transmitting terminal 85 and receiving terminal 86, when laser sends from side, after the receiving terminal 86 of corresponding end receives, shape in horizontal flue
Become a measuring route, these paths can measure CO concentration and fire box temperature in burner hearth simultaneously.
The principle of TDLAS measurement is that gas molecule has an Absorption to the light of characteristic frequency (wavelength), absorbance with
Temperature, pressure, path are related with gas concentration.For a known path and gas pressure, by collecting simultaneously
Analysis absorbance in a characteristic absorption frequency range for the laser is it may be determined that the temperature of flue gas and concentration of component.
Claims (10)
1. a kind of thermal power plant W type boiler SNCR denitration system is it is characterised in that include being arranged on W type boiler (10) horizontal flue
The long spray gun (1) in region, divides the multiple short spray gun (2) of multilamellar setting in W type boiler (10) furnace arch, furnace nose region, and laser detection
System and the metering module (6) being sequentially connected and distribute module (7)；
Distribute module (7) includes long spray gun distribute module (71) and the outfan short spray gun of connection that outfan connects long spray gun (1)
(2) short spray gun distribute module；
Metering module (6) input for controlling urea concentration connects crude urine element solution reservoir (3) and demineralized water respectively
Storage tank (4), outfan connects long spray gun distribute module (71) and short spray gun distribute module respectively；
Central control cabinet (81) that described laser detection system includes being sequentially connected, diode laser (82), fiber optic
Multiplexer (83), optical fiber (84) and multigroup laser instrument；Central control cabinet (81) is used for detecting flue-gas temperature distribution by laser instrument
Signal and CO concentration signal；Its outfan connects long spray gun distribute module (71) and metering module respectively through engineer station (9)
(6)；
Multiple long spray guns (1) are in uniformly multi-tier arrangement on the cross section of horizontal flue, long spray gun distribute module (71) basis
The control signal of engineer station (9) controls the urea liquid flow that each long spray gun (1) is sprayed respectively；Every layer short spray gun (2)
Urea liquid entrance one electrically operated valve is set, short spray gun distribute module (72) is born according to the unit of W type boiler (10)
Lotus and the electrically operated valve aperture of every layer of NSR value control.
2. a kind of thermal power plant W type boiler SNCR denitration system according to claim 1 is it is characterised in that long spray gun (1) is common
It is provided with six, and is in uniformly three layers of arrangement on the cross section of horizontal flue, long spray gun (1) place section is uniformly arranged
Four groups of laser instrument；Laser instrument and long spray gun (1) interval setting；Every group of laser instrument includes a transmitting terminal (85) and a receiving terminal
(86), transmitting terminal (85) connects optical fiber (84), and receiving terminal (86) connects central control cabinet (81).
3. a kind of thermal power plant W type boiler SNCR denitration system according to claim 1 is it is characterised in that long spray gun (1) is cold
But end entrance connects the outfan of desalination water storage tank (4), and colling end outlet connects the input of desalination water storage tank (4).
4. a kind of thermal power plant W type boiler SNCR denitration system according to claim 1 is it is characterised in that also include compressing
Air reservoir (5), the outfan of compressed air reservoir (5) is respectively used to cooling air and is connected to the colling end of short spray gun (2) enter
Mouthful, it is connected between metering module (6) and distribute module (7) for atomizing air.
5. a kind of thermal power plant W type boiler SNCR denitration system according to claim 1 is it is characterised in that described metering
Module (6) includes blender (61), and control valve and the effusion meter being separately positioned on blender (61) two entrances；Crude urine element
The outfan of solution reservoir (3) and desalination water storage tank (4) is passed through fluid filling pump respectively and is connected with corresponding blender (61) entrance.
6. a kind of thermal power plant W type boiler SNCR denitration system according to claim 1 is it is characterised in that every short spray gun
(2) manually-operated gate is set, and all manually-operated gate apertures are consistent.
7. a kind of thermal power plant W type boiler SNCR denitration control method is it is characterised in that based on a kind of fire described in claim 1
In power plant W type boiler SNCR denitration system, including,
The step that urea concentration is adjusted by metering module (6) according to the CO concentration signal that laser detection system obtains；
Each long spray gun (1) is adjusted by long spray gun distribute module (71) according to the temperature distribution signal that laser detection system obtains
The step of the urea liquid flow of injection；
Step according to unit load interval put into operation with the NSR value short spray gun of control (2) number of plies and every layer of urea liquid total flow.
8. a kind of thermal power plant W type boiler SNCR denitration control method according to claim 7 is it is characterised in that adjust urine
The step of plain solution concentration is specific as follows,
Laser detection system obtains the CO concentration signal in horizontal flue using TDLAS measuring method, and CO concentration signal is in engineering
It is converted into a road valve opening signal in teacher station (9) and sends in metering module (6), adjust the control valve of desalination water loop
Aperture, thus control the urea concentration that long spray gun (1) sprays；
Raise with CO concentration, increase desalination discharge；Reduce with CO concentration, reduce desalination discharge.
9. a kind of thermal power plant W type boiler SNCR denitration control method according to claim 7 is it is characterised in that adjust every
The step of the urea liquid flow that individual long spray gun (1) is sprayed is specific as follows,
Laser detection system obtains the temperature distribution signal of flue gas in horizontal flue using TDLAS measuring method, and Temperature Distribution is believed
Number it is converted into multi-way valve opening amount signal in engineer station (9) and sends in long spray gun distribute module (71), adjust each
The aperture of long spray gun (1) control valve, thus control the urea liquid flow that every long spray gun (1) is sprayed.
10. a kind of thermal power plant W type boiler SNCR denitration control method according to claim 7 is it is characterised in that control short
Spray gun (2) put into operation the number of plies and every layer of urea liquid total flow step specific as follows,
Short spray gun (2) point two-layer is arranged on W type boiler (10) furnace arch, furnace nose region, is the short spray gun of ground floor and from the bottom up successively
Two layers of short spray gun；
When the unit of W type boiler (10) is underload, the short spray gun of the ground floor that puts into operation, the short spray gun of the second layer cuts out, and according to NSR
Value adjusts the aperture of ground floor valve；
When the unit of W type boiler (10) is middle load, the two-layer that simultaneously puts into operation spray gun, and two-layer valve is adjusted according to NSR value
Aperture；
When the unit of W type boiler (10) is high load capacity, put into operation second layer spray gun, and the short spray gun of ground floor cuts out, and according to NSR value
Adjust the aperture of second layer valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610822505.5A CN106422732A (en) | 2016-09-13 | 2016-09-13 | Thermal power plant W type boiler SNCR denitration system and control method thereof |
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| CN201610822505.5A CN106422732A (en) | 2016-09-13 | 2016-09-13 | Thermal power plant W type boiler SNCR denitration system and control method thereof |
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| CN106422732A true CN106422732A (en) | 2017-02-22 |
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