CN105983302A - Component detection and ammonia spraying control system of SCR denitrification process - Google Patents
Component detection and ammonia spraying control system of SCR denitrification process Download PDFInfo
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- CN105983302A CN105983302A CN201610377022.9A CN201610377022A CN105983302A CN 105983302 A CN105983302 A CN 105983302A CN 201610377022 A CN201610377022 A CN 201610377022A CN 105983302 A CN105983302 A CN 105983302A
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- flue
- ammonia
- sampling tube
- flue gas
- spray ammonia
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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
-
- 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
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/26—Devices for withdrawing samples in the gaseous state with provision for intake from several spaces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
-
- 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 invention discloses a component detection and ammonia spraying control system of an SCR denitrification process. The component detection and ammonia spraying control system comprises an ammonia spraying main pipe, a plurality of ammonia spraying branch pipes, a flow field distribution controller and a smoke detection device, wherein the smoke detection device comprises a plurality of sampling heads which are arranged at an inlet flue and/or outlet flue of an SCR reactor, the plurality of sampling heads are distributed at different positions on the cross section of the inlet flue and/or outlet flue so as to detect the gas component data at different positions of the inlet flue and/or outlet flue, and the smoke detection device transmits the collected gas component data to the flow field distribution controller; and the plurality of ammonia spraying branch pipes are communicated with the ammonia spraying main pipe, and the openness of a valve of the ammonia spraying main pipe and the openness of a valve of each ammonia spraying branch pipe are controlled by the flow field distribution controller according to the gas component data. The total ammonia gas injection amount of the SCR reactor and the total ammonia gas injection amount of each ammonia spraying branch pipe are precisely controlled, so that the amount of the ammonia gas sprayed from the flues are reasonably re-distributed according to the concentration value of the harmful gas component measured by the smoke detection device in different areas of the flue.
Description
Technical field
The application belongs to gas denitrifying technology field, specifically, relates to the one-tenth of a kind of SCR denitration technique
Go-on-go is surveyed and spray ammonia control system.
Background technology
The development produced along with modern industry and growth in the living standard, atmospheric pollution has become people extremely to close
The problem of note.Atmospheric pollution also exists a big problem, nitrogen oxides NOXPollution problem.NOX
Photochemical reaction can be caused under the effect of sunlight, form photochemical fog, thus cause serious air
Pollute.NOXAtmosphere polluting problem by pay attention to day by day, it has been found that: the injury of health, height
Content nitric acid rain, photochemical fog, ozone reduction and some other problem are all and low concentration of NOXRelevant
System, and its hazardness imagination more original than people is much greater.
Denitrating flue gas, refers to the NO generatedXIt is reduced to N2, thus remove the NO in flue gasX,
Wet denitration and Dry denitration can be divided into according to Processing tecchnics.Specifically include that acid absorption process, Alkali absorption method,
Selective catalytic reduction, SNCR method, absorption method, gas ions activation method etc..Wherein,
Selective catalytic reduction (Selective Catalytic Reduction, SCR) is to use vertical catalysis
Agent reaction tower and anhydrous ammonia, remove nitrogen oxides from the flue gas of coal fired combustion and coal-burning power plant.Tool
Body is for using ammonia (NH3) as reactant, the flue gas discharged with boiler passes through catalyst layer after mixing,
At catalyst layer, NO will be removed under the effect of catalystX, reduction decomposition becomes harmless nitrogen (N2)
With water (H2O)。
At present in SCR technique, the control only one of which total valve aperture for ammonia spraying amount controls to spray ammonia
Flow, the branch's spray ammonia pipeline after total valve only has hand-operated valve to adjust aperture, it is impossible to realizes flue and divides
The online finely regulating in region.The subject matter of control strategy is at present, relies on single measuring point as regulation mesh
Mark, and the degree of accuracy of single measuring point and representativeness are poor, also do not consider the emission distribution in whole flue cross section；
And in order to reach unit emission limit requirement, ammonia spraying amount controls to take the mode of " peaceful many do not lack " (be
Make the NO of dischargeXConcentration is up to standard, sprays into ammonia as much as possible and makes more NOXIt is reduced decomposition,
Make NOXEmission compliance), easily cause local spray ammonia excess.Although SCR exports NOXDischarge
Concentration is up to standard, but too much ammonia spraying amount is converted into the escaping of ammonia and enters air preheater, and air is pre-with entering
The acid medium of hot device, steam reaction, generate NH4HSO4Air preheat is blocked Deng harmful substance
Device, causes the serious consequence such as equipment damage and unit outage.
Summary of the invention
In view of this, the composition detection that this application provides a kind of SCR denitration technique controls system with spray ammonia
System, escapes in order to solve, straying quatity low precision, ammonia the most coarse to the control of ammonia spraying amount in prior art
The technical problems such as ease rate height and air preheater Severe blockage.
In order to solve above-mentioned technical problem, this application discloses the composition detection of a kind of SCR denitration technique with
Spray ammonia control system, including spray ammonia house steward, multichannel spray ammonia arm, Flow Field Distribution controller and flue gas inspection
Device；Wherein, described flue gas inspection device includes multiple sampling head, is arranged at entering of SCR reactor
Mouth flue and/or exhaust pass, the plurality of sampling head is distributed in described gas approach and/or exhaust pass
The diverse location in cross section, to detect the gas componant number of described gas approach and/or exhaust pass diverse location
According to, the described gas-composition data transmission extremely described Flow Field Distribution control that described flue gas inspection device will collect
Device processed；Described multichannel spray ammonia arm connects with described spray ammonia house steward, and described Flow Field Distribution controller is according to institute
State gas-composition data to control valve opening and the valve of each described spray ammonia arm of described spray ammonia house steward
Door aperture.
Described Flow Field Distribution controller can be dense according to the ammonia of each subregion of gas approach of SCR reactor
Degrees of data controls the valve opening of each described spray ammonia arm.
Described Flow Field Distribution controller can rub according to the ammonia nitrogen of each subregion of gas approach of SCR reactor
You control the valve opening of each described spray ammonia arm than distributed data.
Described Flow Field Distribution controller can aoxidize according to the nitrogen of each subregion of exhaust pass of SCR reactor
Substrate concentration data control the valve opening of each described spray ammonia arm.
Described flue gas inspection device also includes: flue gas analyzer and at least with spray ammonia suitable the adopting of arm quantity
Sample pipe；Described sampling head one end perforate is also arranged in flue, and the other end connects with described sampling tube, institute
State sampling tube to connect with the valve of described flue gas analyzer, make the flue gas collected enter through described sampling tube
Described flue gas analyzer.
Every described sampling tube connects with the described sampling head of predetermined number.
Each described sampling head connects with sampling tube independent with respectively.
Described sampling tube is parallel to flue cross-wise direction and arranges；Described sampling tube is fixedly mounted on by support
In flue, or, it being arranged on the support of stepping equipment, described stepping equipment drives described sampling tube row
Proceed to the different depth of described flue.
Described sampling tube is perpendicular to flue cross-wise direction and arranges；Described sampling tube is fixedly mounted on by support
In flue, or, it being arranged on the support of stepping equipment, described stepping equipment drives described sampling tube row
Proceed to the different depth of described flue.
Described sampling tube is communicated to measure air chamber through electromagnetic valve, and described measurement air chamber is externally provided with purge pump and takes out
Air pump, it is achieved for purging and the flue gas sampling of each sampling tube；The flue gas analyzer flue gas to extraction
Sample detects, and transmits detection data to Distributed Control System.
Compared with prior art, the application can obtain and include techniques below effect: accurately control SCR
The ammonia of reactor sprays into total amount and the ammonia straying quatity of each spray ammonia arm, makes the ammonia in flue divide
Cloth more equalizes, and has both ensured that have enough ammonias to participate in denitration reaction avoids the escaping of ammonia phenomenon simultaneously.
Certainly, the arbitrary product implementing the application must be not necessarily required to reach all the above skill simultaneously
Art effect.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing further understanding of the present application, constitutes of the application
Point, the schematic description and description of the application is used for explaining the application, is not intended that the application's
Improper restriction.In the accompanying drawings:
Fig. 1 is that the composition detection of a kind of SCR denitration technique that the embodiment of the present application provides controls system with spray ammonia
System block diagram；
Fig. 2 is that the composition detection of a kind of SCR denitration technique that the embodiment of the present application provides controls system with spray ammonia
System block diagram；
Fig. 3 is that the composition detection of a kind of SCR denitration technique that the embodiment of the present application provides controls system with spray ammonia
System block diagram；
Fig. 4 is the block diagram of the flue gas inspection device of the embodiment of the present application；
Fig. 5 is that the embodiment of the present application utilizes rake soot-blower retrofit for the structural representation of flue gas inspection device
Figure；
Fig. 6 is the subsidiary loop schematic diagram of the flue gas inspection device of the embodiment of the present application.
Detailed description of the invention
Presently filed embodiment is described in detail, thereby to the application below in conjunction with drawings and Examples
How application technology means solve technical problem and reach the process that realizes of technology effect and can fully understand
And implement according to this.
The composition detection of the SCR denitration technique that the embodiment of the present application provides and spray ammonia control system, at SCR
The gas approach of reactor and/or exhaust pass arrange flue gas inspection device, and this flue gas inspection device is provided with many
Individual sampling head, can gather gas-composition data from different positions, and Flow Field Distribution controller is according to gas
Body compositional data controls spray ammonia house steward and the valve opening of spray ammonia arm, thus accurately controls SCR reactor
Ammonia spray into total amount and the ammonia straying quatity of each spray ammonia arm, make ammonia in flue be distributed more
Equalize, rationally.
Fig. 1 is that the composition detection of a kind of SCR denitration technique that the embodiment of the present application provides controls system with spray ammonia
System, including flue gas inspection device 20 and Flow Field Distribution controller 21, spray ammonia house steward 22 and spray ammonia arm
23.The composition detection of this SCR denitration technique and spray ammonia control system include a road spray ammonia house steward 22, spray
Ammonia arm 23 is multichannel (not shown), and such as, spray ammonia arm 23 is 16 tunnels.Multichannel spray ammonia
Arm connects with spray ammonia house steward 22, total ammonia spraying amount of multichannel spray ammonia arm and the ammonia spraying amount of spray ammonia house steward 22
Identical.Spray ammonia house steward 22 is for controlling to enter the spray ammonia total amount of SCR reactor, and spray ammonia arm 23 is used for
The ammonia straying quatity of zones of different in control flue.
Flue gas inspection device 20 is arranged at the gas approach of SCR reactor, including multiple sampling heads,
These sampling heads are distributed in the diverse location of gas approach, gather from multiple diverse locations of gas approach
Flue gas in gas approach also detects.First detection device 20 communicates with Flow Field Distribution controller 21
Connect, the gas-composition data detected is sent to Flow Field Distribution controller 21.Flow Field Distribution controller
21 spray the valve opening of ammonia arm 23 according to gas-composition data regulation, reach to regulate each subregion in flue
The purpose of ammonia straying quatity.
Gas-composition data includes the data such as ammonia concentration, nitrous oxides concentration, oxygen amount, becomes according to gas
Divided data judges whether the ammonia nitrogen mol ratio distribution in whole flue cross section equalizes.With ammonia nitrogen mole in flue
It is principle than distributing equilibrium, has both ensured have enough ammonias to react with nitrogen oxides, also controlled ammonia
Amount not too much, does not prevents too much the escaping of ammonia because after ammonia enters air preheater, can with enter
Enter the acid medium of air preheater, steam reaction, generate NH4HSO4Block Deng harmful substance
Air preheater.
Flow Field Distribution controller 21 can be by the most integrated, it is also possible to is integrated in Distributed Control System
In (Distributed Control System, DCS).
Flow Field Distribution controller 21 can aoxidize according to the nitrogen of each subregion of gas approach of SCR reactor
Substrate concentration data control the valve opening of each spray ammonia arm；Can also be according to the entrance of SCR reactor
The ammonia nitrogen mol ratio distributed data of each subregion of flue controls the valve opening of each spray ammonia arm；Also may be used
Each spray is controlled with the nitrous oxides concentration data of each subregion of exhaust pass according to SCR reactor
The valve opening of ammonia arm.The Controlling principle followed is all the ammonia nitrogen mole making gas approach cross section each position
Than distributing equilibrium and have enough ammonia to participate in denitration reaction to make that nitrous oxides concentration is up to standard to be avoided simultaneously
The escaping of ammonia phenomenon occurs.
In one embodiment, multiple sampling heads of flue gas inspection device 20 are distributed in inside gas approach
The overlay area of each spray ammonia arm, becomes detecting the gas in the overlay area of each spray ammonia arm respectively
Divided data.The i.e. sampling head of flue gas inspection device 20 is correspondingly arranged with each spray ammonia arm, each sampling
Head is responsible for gathering the gas-composition data of the spray ammonia arm institute overlay area of its correspondence.According to spray ammonia arm institute
Cover the effective range in each region, SCR inlet flue is divided into some subregions, and obtains these points
The online data of the constituent concentrations such as nitrogen oxides in district, ammonia, oxygen.Flow Field Distribution controller 21
The gas-composition data gathered according to each sampling head controls the valve opening of the spray ammonia arm of its correspondence,
Realize the online subregion of ammonia spraying amount accurately to control.
In one embodiment, as in figure 2 it is shown, be also provided with a cigarette at the exhaust pass of SCR reactor
Gas detection device 20.Multiple sampling heads of this flue gas inspection device 20 are distributed in exhaust pass cross section not
Co-located, to detect the gas-composition data of exhaust pass diverse location.This flue gas inspection device 20 will
The gas-composition data of the exhaust pass collected transmits to Flow Field Distribution controller 21, by Flow Field Distribution control
Device 21 processed controls the ammonia straying quatity of gas approach internal spray ammonia house steward and/or each ammonia spraying ammonia arm
Straying quatity.
The distribution of each gas componant of exhaust pass is gathered by the flue gas inspection device 20 being arranged on exhaust pass
Data, Flow Field Distribution controller 21 determines whether the nitrous oxides concentration of discharge gas reaches environmental protection standard.
When the concentration of nitrogen oxides is not up to environmental protection standard, increase the valve opening of spray ammonia house steward 22, increase
Ammonia spray into total amount, made more ammonia participate in denitration reaction, reduce discharge gas nitrogen oxygen
The purpose of compound concentration.When the concentration of nitrogen oxides has reached environmental protection standard, and ammonia concentration is more than presetting
During standard, the valve opening of spray ammonia house steward 22 can be reduced, reduce ammonia and spray into the effect of total amount.
In the another kind of deformation of the present embodiment, multiple sampling heads of this flue gas inspection device 20 are distributed in
Exit region that each spray ammonia arm is corresponding in exhaust pass, to detect each spray ammonia arm institute respectively
The corresponding gas-composition data in exit region.The most corresponding spray ammonia arm of the most each sampling head,
Exhaust pass is also divided into multiple subregion simultaneously, and each spray ammonia arm is except corresponding one of gas approach
Outside subregion, at an exhaust pass also corresponding subregion.Each sampling head of this flue gas inspection device 20
Detect its gas-composition data at subregion corresponding to exhaust pass, to determine that the nitrogen in each subregion aoxidizes
Whether substrate concentration reaches environmental protection standard, and whether ammonia concentration exceedes preset standard, testing result is returned
It is back to Flow Field Distribution controller 21.The detection knot that Flow Field Distribution controller 21 returns according to each sampling head
Really, control the valve opening of the spray ammonia arm corresponding with sampling head, reach to control exhaust pass correspondence subregion
In the purpose of ammonia concentration, it is achieved that in the ammonia straying quatity of each spray ammonia arm and corresponding subregion thereof
The accurate control of ammonia concentration.To the control of the valve opening of each spray ammonia arm be arranged on into
The flue gas inspection device 20 of mouthful flue and be arranged on the detection knot of flue gas inspection device 20 of exhaust pass
Fruit is common foundation, and the gas discharged to take into account exhaust pass meets preset standard gas approach simultaneously and cuts
The ammonia nitrogen mol ratio distributing equilibrium in face.
In another embodiment, the composition detection of SCR denitration technique as shown in Figure 3 controls with spray ammonia
System, including flue gas inspection device 20 and Flow Field Distribution controller 21, wherein, flue gas inspection device 20
Including multiple sampling heads the exhaust pass that is arranged at SCR reactor, multiple sampling heads are distributed in outlet cigarette
The diverse location in cross section, road, to detect the gas-composition data of exhaust pass diverse location, flue gas inspection fills
Put 20 to transmit to Flow Field Distribution controller 21, the gas-composition data of the exhaust pass collected by flowing
Field distribution controller 21 controls the spray ammonia arm within the gas approach of SCR reactor or spray ammonia house steward
Ammonia straying quatity.
The present embodiment only arranges flue gas inspection device 20 at exhaust pass, according to flue gas inspection device 20
Testing result arrange control spray ammonia house steward 22 valve opening, the nitrogen oxides making discharge gas is dense
Degree meets environmental protection standard and avoids the occurrence of too much the escaping of ammonia simultaneously.
If each sampling head of flue gas inspection device 20 is carried out corresponding with spray ammonia arm respectively, and
Exhaust pass is carried out subregion, each sampling tube is arranged in the subregion of correspondence, each point can be detected
Gas-composition data in district.According to the testing result of each sampling head, the valve to each spray ammonia arm
Aperture is respectively controlled, to reach the mesh accurately controlled the valve opening of each spray ammonia arm
's.The nitrogen oxides in whole exhaust pass additionally can be determined according to the testing result of each sampling head
Concentration and ammonia concentration, and control to spray the valve opening of ammonia house steward 22 according to this result, reach to control
Ammonia sprays into the purpose of total amount.
Flue gas inspection device in the various embodiments described above as shown in Figure 4, including multiple sampling heads 10, is sampled
One end 101 opening of head, the other end 102 connects with sampling tube 11, sampling tube 11 and flue gas analyzer
The valve connection of 12.One end 101 of sampling head opening is arranged in flue, and flue gas enters sampling from opening
10 and arrive flue gas analyzer 12 through sampling tube 11, by the flue gas analyzer 12 composition to flue gas
Concentration is analyzed.The sampling head 10 distribution on sampling tube 11 can be uniformly or non-uniformly to be distributed,
Sampling tube 11 can be drawn from furnace wall, is communicated to flue gas analyzer 12.
In SCR denitration technique, this flue gas inspection device may be used for detecting sampling head 10 position
Ammonia, nitrogen oxides, oxygen amount, the constituent concentration such as carbon monoxide (CO), collecting and distributing control system to assist
The ammonia that system (Distributed Control System, DCS) controls in SCR reactor sprays into total amount
And the ammonia straying quatity of each spray ammonia arm.
In one embodiment, every described sampling tube connects with the sampling head of predetermined number, this present count
Amount is more than one.Such as, every sampling tube and ten sampling head connections, i.e. it is provided with ten on this sampling tube
Sampling head to gather flue gas sample from diverse location, if this flue gas inspection device has three samplings respectively
Pipe, this flue gas inspection device can carry out collecting sample from the 30 of flue cross section diverse location.Sampling tube
Quantity can be at least suitable with the spray ammonia arm quantity of SCR reactor inlet flue, in order to gathers difference spray
The region that ammonia arm is covered.Therefore, can according to the size in flue cross section arrange sampling tube quantity and
The quantity of the sampling head of every sampling tube connection.All sampling heads can be evenly distributed in sampling tube
On, the collection to flue inside smoke data more equalizes.
This mode of communicating can be referred to as multichannel mixed type, and the flue gas sample that the most multiple sampling heads gather mixes
It is combined, enters flue gas analyzer through same sampling tube, be more suitable for test point less, need to obtain
The detection scene of data of averaging, increases the representativeness gathering data.
Additionally, another mode of communicating is referred to as independent sample type, the flue gas that the most each sampling head gathers passes through
Independent sampling tube enters flue gas analyzer, is more suitable for test point many, needs to obtain each subregion detailed
The detection scene of total number evidence.Such as, the region covered for each spray ammonia arm is respectively provided with independent
Test point, such that it is able to the ammonia concentration in separately detect each spray ammonia arm institute overlay area or nitrogen oxygen
Compound concentration.
The sampling tube of flue gas inspection device can be parallel to flue cross section and arrange, or is perpendicular to flue cross section
Arrange.When sampling tube be parallel to flue cross section arrange time, be suitable for use fixedly mounted mode, sampling head
It is fixedly mounted in flue by support with sampling tube, it is adaptable to need fixed position is detected for a long time
Scene, it is possible to it is used On-line Control pattern.
When sampling tube be perpendicular to flue cross section arrange time, be suitable for using portable (portable) mounting means,
Sampling tube and sampling head are arranged on the support of stepping equipment, can prosecutor with special time, the degree of depth etc.
Formula moves measurement in flue, it is adaptable to the occasion such as interim measurement, optimization Test.Owing to inserting cigarette
The degree of depth in road is controlled, by increasing the pendulous frequency of different depth, can obtain whole more than sampling head number
The measurement result of several times, so can use when needs more accurate subregion concentration information.In view of provisional,
Portable measurement demand, it is interim that sampling tube uses sampling tube when being longitudinally arranged to facilitate unit operation to pass through
Tested flue is inserted in detection hole.
For SCR reactor, use the detection device of portable (portable) at its gas approach,
Such that it is able to the overlay area of each spray ammonia arm is detected respectively, and whole flue gas can be obtained
Cross section is at many groups measured value of the different flue degree of depth, and the control to each spray ammonia arm ammonia spraying amount is more smart
Really, the ammonia nitrogen mol ratio distribution making whole flue cross section more equalizes.And can use solid at its exhaust pass
The detection device of fixed pattern, is beneficial to whether the nitrous oxides concentration after ad-hoc location determines SCR reaction accords with
Close environmental protection standard, and according to the spray ammonia total amount of testing result regulation spray ammonia house steward.
In one embodiment, the stepping equipment in portable (portable) mounting means and fixing adopt
The support of sample pipe and sampling head can be realized by transformation rake soot blower.Rake soot blower is mainly used in clearly
Clean fin type heating surface, air preheater fume side heating surface and SCR reactor.Soot blowing element is
A piece soot blowing rake, is made up of central canal and the some arms equipped with multiple special nozzle.Penetrate from nozzle
The air-flow gone out can be clean by the space purging covered.The central canal rear end of soot blowing rake is connected with outer tube.Outer tube
Motion is driven by the gear walking case of movement on crossbeam.Soot blower valve passes through fixing inner tube to soot blowing
Pipe provides blowing medium.Rake soot blower is as it is shown in figure 5, most power plant is owing to considering catalyst peace
Row for the national games, the rake soot blower of configuration does not come into operation, the grid type rake pipe of this equipment, can pass through
After appropriate reconstruction, the support as the grid type sampling tube of flue gas inspection device uses, it is also possible to design is solely
Staking supports sampling tube；And its gear walking case drives central canal and rake pipe different depth row in flue
The characteristic entered, it is possible to achieve the measurement of concetration to the nitrogen oxides of SCR inlet flue cross section diverse location.
Rake soot blower includes nozzle, rake pipe, central canal and gear walking case；By nozzle as sampling head and
Arranging sampling tube in rake pipe, rake pipe connects with central canal, and central canal is advanced under the drive of gear walking case
Different depth to flue.
By the transformation to rake pipe, a horizontal rake pipe can design several sampling tubes, simultaneously (with
Patrol survey mode) complete flue gas sampling and the measurement of multiple sampled points under an insertion depth.Under the same degree of depth
Several values be measured after, by gear walking case drive whole detection probe advance to another degree of depth,
After putting in place, resampling measures the smoke components concentration of all sampled points.So, whole flue can be obtained
More than the subregion composition concentration measurement of sampling tube integral multiple on cross section.
The function details such as the travel depth of whole flue gas inspection device, detection time, can be by control system
Programming completes, and makes whole flue gas inspection device more rationally Effec-tive Function.
Sampling tube is connected by valve with flue gas analyzer, and every sampling tube is respectively mounted electromagnetic valve, Ke Yishi
The switching of existing independent sample return controls.The electromagnetic valve of all sampling tubes can be packaged in an electromagnetism
Within clack box, as shown in Figure 6, all sampling tubes are communicated to measure air chamber through solenoid valve box.Measure air chamber
Outer design air pump, purge pump, it is achieved the purging of each sampling tube, the purging measuring air chamber and sampling tube
The fume extraction on road is drawn.
Such as, the control flow of this flue gas inspection device is as follows:
(1) after system start-up, initially purge: all sampling tube electromagnetic valves are opened, and blow down valve is beaten
Opening, purge pump runs 1 minute, purges；
(2) sampling: close all sampling tube electromagnetic valves；Close purge pump；Open X road sampling tube
Electromagnetic valve, start air pump, complete the smoke sampling of X road sampling tube；
(3) measure: open the measurement valve of flue gas analyzer, measure gauge outfit and connect with X road sampler,
The measurement of sampling is completed after stable reading；Measure signal and send into DCS；
(4) blowback: stop air pump, closes extraction valve；Drive blow down valve, start purge pump, purge 30
Second；
(5) cycle sampling, measurement: return step (2)；
(6) out of service: to open all sampling tube electromagnetic valves, stop air pump and close extraction valve, unlatching is blown
Sweep valve, start purge pump (stand-by heat, purging prevents blocking always).
More than control process to complete to control with DCS, it is also possible to PLC or on-the-spot embedded device
It is controlled, depending on different application occasion, mounting means.After detection data complete DCS passback,
Function can be shown in real time, such as SCR what operator station realized denitrating system online Flow Field Distribution data
Gas approach ammonia concentration Subarea detecting data, SCR inlet flue nitrous oxides concentration Subarea detecting number
According to, SCR exhaust pass nitrous oxides concentration Subarea detecting data, SCR exhaust pass ammonia concentration divide
District's detection data and the display of other gas componants (such as oxygen, carbon monoxide etc.) detection data.
As employed some vocabulary in the middle of description and claim to censure specific components.This area skill
Art personnel are it is to be appreciated that hardware manufacturer may call same assembly with different nouns.This explanation
In the way of book and claim not difference by title is used as distinguishing assembly, but with assembly in function
On difference be used as distinguish criterion." bag as mentioned by the middle of description in the whole text and claim
Contain " it is an open language, therefore " comprise but be not limited to " should be construed to." substantially " refer to receivable
In range of error, those skilled in the art can solve described technical problem, base in the range of certain error
Originally described technique effect is reached.Additionally, " coupling " word comprises any directly and indirectly electrical coupling at this
Catcher section.Therefore, if a first device is coupled to one second device described in literary composition, then described first is represented
Device can directly be electrically coupled to described second device, or by other devices or to couple means the most electric
Property is coupled to described second device.Description subsequent descriptions is to implement the better embodiment of the application, so
For the purpose of described description is the rule so that the application to be described, it is not limited to scope of the present application.
The protection domain of the application is when being as the criterion depending on the defined person of claims.
Also, it should be noted term " includes ", " comprising " or its any other variant are intended to non-
Comprising of exclusiveness, so that include that the commodity of a series of key element or system not only include that those are wanted
Element, but also include other key elements being not expressly set out, or also include for this commodity or be
Unite intrinsic key element.In the case of there is no more restriction, statement " including ... " limit
Key element, it is not excluded that there is also other identical element in the commodity including described key element or system.
Described above illustrate and describes some preferred embodiments of the application, but as previously mentioned, it should reason
Solve the application and be not limited to form disclosed herein, be not to be taken as the eliminating to other embodiments,
And can be used for various other combination, amendment and environment, and can in invention contemplated scope described herein,
It is modified by above-mentioned teaching or the technology of association area or knowledge.And those skilled in the art are carried out changes
Move and change is without departing from spirit and scope, the most all should be in the protection of the application claims
In the range of.
Claims (10)
1. the composition detection of a SCR denitration technique and spray ammonia control system, it is characterised in that include
Spray ammonia house steward, multichannel spray ammonia arm, Flow Field Distribution controller and flue gas inspection device；
Wherein, described flue gas inspection device includes multiple sampling head, is arranged at the entrance of SCR reactor
Flue and/or exhaust pass, the plurality of sampling head is distributed in described gas approach and/or exhaust pass cuts
The diverse location in face, to detect the gas componant number of described gas approach and/or exhaust pass diverse location
According to, the described gas-composition data transmission extremely described Flow Field Distribution control that described flue gas inspection device will collect
Device processed；
Described multichannel spray ammonia arm connects with described spray ammonia house steward, and described Flow Field Distribution controller is according to described
Gas-composition data controls valve opening and the valve of each described spray ammonia arm of described spray ammonia house steward
Aperture.
System the most according to claim 1, it is characterised in that described Flow Field Distribution controller can
The nitrous oxides concentration data of each subregion of gas approach according to SCR reactor control each described
The valve opening of spray ammonia arm.
System the most according to claim 1, it is characterised in that described Flow Field Distribution controller can
The ammonia nitrogen mol ratio distributed data of each subregion of gas approach according to SCR reactor controls each institute
State the valve opening of spray ammonia arm.
System the most according to claim 1, it is characterised in that described Flow Field Distribution controller can
The nitrous oxides concentration data of each subregion of exhaust pass according to SCR reactor control each described
The valve opening of spray ammonia arm.
System the most according to claim 1, it is characterised in that described flue gas inspection device also wraps
Include: flue gas analyzer and at least suitable with spray ammonia arm quantity sampling tube；Described sampling head one end perforate
And be arranged in flue, the other end connects with described sampling tube, described sampling tube and described flue gas analyzer
Valve connection, make the flue gas that collects enter described flue gas analyzer through described sampling tube.
System the most according to claim 5, it is characterised in that every described sampling tube is with default
The described sampling head connection of quantity.
System the most according to claim 5, it is characterised in that each described sampling head respectively with
A piece independent sampling tube connection.
System the most according to claim 5, it is characterised in that described sampling tube is parallel to flue
Cross-wise direction is arranged；Described sampling head and sampling tube are fixedly mounted in flue by support, or, peace
Being contained on the support of stepping equipment, described stepping equipment drives described sampling tube to march to described flue not
The same degree of depth.
System the most according to claim 5, it is characterised in that described sampling tube is perpendicular to flue
Cross-wise direction is arranged；Described sampling head and sampling tube are fixedly mounted in flue by support, or, peace
Being contained on the support of stepping equipment, described stepping equipment drives described sampling tube to march to described flue not
The same degree of depth.
System the most according to claim 5, it is characterised in that described sampling tube is through electromagnetic valve even
Passing to measure air chamber, described measurement air chamber is externally provided with purge pump and air pump, it is achieved for each sampling tube
Purging and flue gas sampling；The flue gas sample of extraction is detected by flue gas analyzer, and will detect number
According to transmission to Distributed Control System.
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