CN109991046A - The NH of SCR reactor3Concentration on-line period measuring device and method - Google Patents
The NH of SCR reactor3Concentration on-line period measuring device and method Download PDFInfo
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- CN109991046A CN109991046A CN201910338771.4A CN201910338771A CN109991046A CN 109991046 A CN109991046 A CN 109991046A CN 201910338771 A CN201910338771 A CN 201910338771A CN 109991046 A CN109991046 A CN 109991046A
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- 238000000034 method Methods 0.000 title description 6
- 238000005070 sampling Methods 0.000 claims abstract description 80
- 238000006555 catalytic reaction Methods 0.000 claims abstract description 34
- 230000008878 coupling Effects 0.000 claims abstract description 32
- 238000010168 coupling process Methods 0.000 claims abstract description 32
- 238000005859 coupling reaction Methods 0.000 claims abstract description 32
- 239000003054 catalyst Substances 0.000 claims abstract description 17
- 238000000691 measurement method Methods 0.000 claims abstract description 17
- 230000009467 reduction Effects 0.000 claims abstract description 9
- 238000013459 approach Methods 0.000 claims abstract description 5
- 239000000523 sample Substances 0.000 claims description 88
- 239000007789 gas Substances 0.000 claims description 67
- 239000003546 flue gas Substances 0.000 claims description 29
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 23
- 238000006243 chemical reaction Methods 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000000284 extract Substances 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000000605 extraction Methods 0.000 abstract description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 24
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 23
- 229910021529 ammonia Inorganic materials 0.000 description 9
- 238000006722 reduction reaction Methods 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000012716 precipitator Substances 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
-
- 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
- G01N1/24—Suction devices
-
- 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
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
-
- 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
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0011—Sample conditioning
-
- 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
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—Specially adapted to detect a particular component
- G01N33/0037—Specially adapted to detect a particular component for NOx
-
- 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
- G01N2001/2261—Sampling from a flowing stream of gas in a stack or chimney preventing condensation (heating lines)
Abstract
The invention discloses a kind of NH of SCR reactor3Concentration on-line period measuring device, including coupling catalytic reactions device, SCR inlet stack sampling component and SCR exhaust pass sampling assemble；SCR inlet stack sampling component is connected to coupling catalytic reactions component；SCR exhaust pass sampling assemble is connected to coupling catalytic reactions component；Wherein, sample gas of the coupling catalytic reactions component for the hybrid SC R gas approach sampling assemble sample gas extracted and the extraction of SCR exhaust pass sampling assemble, and aggregate sample gas is made to each lead into NO through two pathsxAnalyzer；Selective reduction catalyst is configured in first paths, the second paths are straight channel.The NH of the equipment energy precise measurement SCR reactor outlet3Concentration fully understands SCR inside reactor situation convenient for user.Invention additionally discloses a kind of NH of SCR reactor3Concentration on-line period measurement method, is capable of measuring the NH of SCR reactor outlet3Concentration.
Description
Technical field
The present invention relates to flue gas inspection technical fields, online more specifically to a kind of NH3 concentration of SCR reactor
Sampling and measuring equipment further relates to a kind of NH3 concentration on-line period measurement method of SCR reactor.
Background technique
With the development of society, environmental protection is increasingly paid close attention to by people, coal-burning power plant is to flue gas NOxConcentration of emission requirement
It is higher and higher.Currently, coal-burning power plant's denitrification apparatus mainly uses SCR (Selective Catalytic Reduction, selection
Property catalytic reduction method) reactor, in the improved actual moving process of minimum discharge, due to SCR structure of reactor design ask
The variation of the factors such as topic, load fluctuation, equipment operating condition, flue flow field and NOxDistribution of concentration is irregular, causes part area
Domain ammonia/nitrogen molar ratio is excessive, and ammonia cannot all participate in reacting, and SCR reactor outlet the escaping of ammonia exceeds limit value, while shortage has again
The continuous on-line monitoring of effect, can not fully understand SCR inside reactor situation, and cannot provide for spray ammonia Precise control can
By foundation, so that SCR reactor operation and management level is low, air preheater blocking is serious, increases air-introduced machine energy consumption and ammonia consumption, makes
It is serious at electric precipitator pole plate collection ash, reduce efficiency of dust collection, the serious safe and reliable economical operation of operating unit.
To sum up, how to the NH of SCR reactor outlet3Concentration on-line period detection, so that user fully understands SCR reaction
Device inner case is those skilled in the art's urgent problem to be solved.
Summary of the invention
In view of this, the present invention provides a kind of NH of SCR reactor3Concentration on-line period measuring device, can measure SCR
The NH of reactor outlet3Concentration fully understands SCR inside reactor situation convenient for user.The present invention also provides a kind of SCR reactions
The NH of device3Concentration on-line period measurement method, is capable of measuring the NH of SCR reactor outlet3Concentration.
To achieve the above object, the invention provides the following technical scheme:
A kind of NH of SCR reactor3Concentration on-line period measuring device, comprising:
Coupling catalytic reactions component；
SCR inlet stack sampling component is connected to the coupling catalytic reactions component；
SCR exhaust pass sampling assemble is connected to the coupling catalytic reactions component；
Wherein, the coupling catalytic reactions component is for mixing the SCR inlet stack sampling component and the outlet the SCR
The sample gas that stack sampling component extracts, and aggregate sample gas is made to each lead into NO through two pathsxAnalyzer；Match in first paths
It is equipped with selective reduction catalyst, the second paths are straight channel.
Preferably, the NH of above-mentioned SCR reactor3In concentration on-line period measuring device, first paths and described
Second paths pass through switching three-way valve and the NO respectivelyxAnalyzer connection.
Preferably, the NH of above-mentioned SCR reactor3In concentration on-line period measuring device, the coupling catalytic reactions component
Include:
Shell, the two paths are separately mounted in the shell；The SCR inlet stack sampling component and described
SCR exhaust pass sampling assemble is connected to the shell respectively；
Catalyst heater, the catalyst heater are installed on first paths or the shell.
Preferably, the NH of above-mentioned SCR reactor3In concentration on-line period measuring device, the SCR inlet stack sampling group
Part includes:
The sampling probe in SCR inlet flue is protruded into, the arrival end of the sampling probe is equipped with filter；
The water removal drier being connected to by heat traced pipeline with the sampling probe；
The sampling pump being connected to the water removal drier；
The flowmeter being connected to the sampling pump, the outlet end of the flowmeter and the coupling catalytic reactions component connect
It is logical.
Preferably, the NH of above-mentioned SCR reactor3In concentration on-line period measuring device, the SCR exhaust pass sampling group
Part includes:
The sampling probe in SCR exhaust pass is protruded into, the arrival end of the sampling probe is equipped with filter；
The water removal drier being connected to by heat traced pipeline with the sampling probe；
The sampling pump being connected to the water removal drier, the outlet end of the sampling pump and the coupling catalytic reactions component
Connection.
A kind of NH of SCR reactor3Concentration on-line period measurement method, comprising:
It is separately sampled to SCR inlet flue and SCR exhaust pass, it is divided into two-way after mixing two kinds of sample gas and each leads into
NOxAnalyzer is detected, and calculates NH in flue gas according to two-way sample gas testing result3Concentration；
Wherein, first via aggregate sample gas is sufficiently reacted in the effect of selective reduction catalyst and under oxygen existence condition
After be passed through the NOxAnalyzer；Second road aggregate sample gas is passed directly into the NOxAnalyzer.
Preferably, the NH of above-mentioned SCR reactor3In concentration on-line period measurement method, the reaction of first via aggregate sample gas
Temperature is 300 DEG C -400 DEG C.
Preferably, the NH of above-mentioned SCR reactor3In concentration on-line period measurement method, by the SCR inlet flue and institute
State SCR exhaust pass extraction sample gas need be filtered respectively, dry after mixed.
Preferably, the NH of above-mentioned SCR reactor3It is described " to be detected according to two-way sample gas in concentration on-line period measurement method
As a result NH in flue gas is calculated3Concentration " specifically:
Compare NO in two-way aggregate sample gasxConcentration value, obtain after catalysis reaction only reduces in first via aggregate sample gas
NOxConcentration value, according to NH3And NOxReaction molar ratio be 1:1 calculate the NH in aggregate sample gas3Concentration value.
Preferably, the NH of above-mentioned SCR reactor3In concentration on-line period measurement method, to the sample of SCR inlet flue extraction
Gas controls flow by flowmeter.
The present invention provides a kind of NH of SCR reactor3Concentration on-line period measuring device, including coupling catalytic reactions dress
It sets, SCR inlet stack sampling component and SCR exhaust pass sampling assemble；SCR inlet stack sampling component and coupling catalytic reactions
Component connection；SCR exhaust pass sampling assemble is connected to coupling catalytic reactions component；Wherein, coupling catalytic reactions component is used for
The sample gas that the sample gas and SCR exhaust pass sampling assemble that hybrid SC R gas approach sampling assemble extracts extract, and make aggregate sample gas
NO is each led into through two pathsxAnalyzer；Selective reduction catalyst is configured in first paths, the second paths are straight
Channel.
In application, enter to SCR, after exhaust pass is separately sampled, into coupling catalytic reactions component in mix, sample after mixing
Gas respectively enters NO by two pathsxAnalyzer, NH in the aggregate sample gas of the first paths3With NOxWith the molar ratio of 1:1
It reacts, aggregate sample gas is directly entered NO in the second pathsxAnalyzer, by comparing NO in two-way sample gasxConcentration can obtain
Obtain NH in flue gas3Concentration provides reliably so that user be made to fully understand SCR inside reactor situation for spray ammonia Precise control
Foundation improves SCR reactor operation and management level, prevents air preheater from blocking, and reduces air-introduced machine energy consumption and ammonia consumption, avoids electricity
Pole plate of dust remover collection ash is serious, improves efficiency of dust collection, it is ensured that the safe and reliable economical operation of Power Plant.
The present invention also provides a kind of NH of SCR reactor3Concentration on-line period measuring device, can measure SCR reactor
The NH of outlet3Concentration.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the NH of SCR reactor provided in an embodiment of the present invention3The structural representation of concentration on-line period measuring device
Figure；
Fig. 2 is the detailed construction schematic diagram of equipment shown in Fig. 1；
Wherein, in Fig. 1-Fig. 2:
SCR inlet stack sampling component 101；SCR exhaust pass sampling assemble 102；Coupling catalytic reactions component 103；It crosses
Filter 1011,1021；Sampling probe 1012,1022；Heat traced pipeline 1013,1023；Remove water drier 1014,1024；Sampling pump
1015,1025；Flowmeter 1016；Selective reduction catalyst 1031；Catalyst heater 1032；First paths 1033；The
Two paths 1034；Switching three-way valve 1035.
Specific embodiment
The embodiment of the invention discloses a kind of NH of SCR reactor3Concentration on-line period measuring device, can precise measurement
The NH of SCR reactor outlet3Concentration fully understands SCR inside reactor situation convenient for user.The present invention also provides a kind of SCR
The NH of reactor3Concentration on-line period measurement method, is capable of measuring the NH of SCR reactor outlet3Concentration.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1-Fig. 2 is please referred to, the embodiment of the present invention provides a kind of NH of SCR reactor3Concentration on-line period measuring device,
Including coupling catalytic reactions device 103, SCR inlet stack sampling component 101 and SCR exhaust pass sampling assemble 102；SCR enters
Mouth stack sampling component 101 is connected to coupling catalytic reactions component 103；SCR exhaust pass sampling assemble 102 is anti-with coupling and catalyzing
Component 103 is answered to be connected to；Wherein, coupling catalytic reactions component 103 is used for the sample that hybrid SC R gas approach sampling assemble 101 extracts
The sample gas that gas and SCR exhaust pass sampling assemble 102 extract, and aggregate sample gas is made to each lead into NO through two pathsxAnalyzer；
Selective reduction catalyst 1031 is configured in first paths 1033, the second paths 1034 are straight channel.
In application, enter to SCR, after exhaust pass is separately sampled, into coupling catalytic reactions component 103 in mix, mix
Sample gas respectively enters NO by two paths afterwardsxAnalyzer, NH in the aggregate sample gas of the first paths 10333With NOxWith 1:1's
Molar ratio reacts, and aggregate sample gas is directly entered NO in the second paths 1034xAnalyzer, by comparing in two-way sample gas
NOxConcentration can be obtained NH in flue gas3Concentration, to make user fully understand SCR inside reactor situation, for spray ammonia fining
Control provides reliable basis, improves SCR reactor operation and management level, prevents air preheater from blocking, and reduces air-introduced machine energy consumption and ammonia
Consumption avoids electric precipitator pole plate collection ash serious, improves efficiency of dust collection, it is ensured that the safe and reliable economical operation of Power Plant.
Above scheme is based on NH3And NOxMolar reactive ratio be 1:1, by monitoring flue gas after two paths
NOxConcentration value obtains the NO of only reduces in flue gas after catalysis is reactedxConcentration value, to calculate NH in flue gas3Concentration.For
Guarantee the reliability of the measuring principle, the NH in first via flue gas3With NOxIt has to sufficiently react, otherwise because SCR exports NOxIt is dense
It spends low, makes part NH in flue gas3Reaction is had neither part nor lot in, then uses the calculated NH of above-mentioned principle3Concentration will serious distortion, therefore
It must make NOxThere is the excess of appropriateness in concentration, and introduce SCR inlet flue gas in above-mentioned technical proposal and be allowed to export cigarette with SCR
Gas mixing, improves NO in aggregate sample gasxConcentration guarantees the NH of flue gas in the first paths 10333Sufficiently reacted.Obviously, this sets
It is standby to improve NH3The reliability and precision of measurement of concetration.
The NH of SCR reactor as above3In concentration on-line period measuring device, the first paths 1033 and the second paths
1034 pass through switching three-way valve 1035 and NO respectivelyxAnalyzer connection.Using when can control switching three-way valve 1035 use shape
State makes two paths successively and NOxAnalyzer connection, NOxAnalyzer successively detects NO in the flue gas of two pathsxConcentration.When
So, the first paths 1033 and the second paths 1034 may also be configured to NO different from two respectivelyxAnalyzer connection, makes two
Platform NOxAnalyzer detects NO in the flue gas of two paths respectivelyxConcentration, the present embodiment does not limit.
In technical solution as above, in addition to above-mentioned two paths and switching three-way valve 1035, coupling catalytic reactions component 103 is also
Including shell and catalyst heater 1032；Two paths are separately mounted in shell；101 He of SCR inlet stack sampling component
SCR exhaust pass sampling assemble 102 is connected to shell respectively；Catalyst heater 1032 is installed on the first paths 1033 or outer
Shell, for the temperature in first passage to be heated to 300 DEG C -400 DEG C, so as to the NH of flue gas in first passage3With NOxOccur also
Former elimination reaction.
Specifically, the NH of above-mentioned SCR reactor3In concentration on-line period measuring device, SCR inlet stack sampling component
101 include sampling probe 1012, water removal drier 1014, sampling pump 1015 and flowmeter 1016；Sampling probe 1012 is mounted on
On SCR inlet flue and protrude into SCR inlet flue；The arrival end of sampling probe 1012 is equipped with filter 1011, filter
1011 are located in SCR inlet flue；Water removal drier 1014 is connected to by heat traced pipeline 1013 with sampling probe 1012；Sampling pump
1015 are connected to water removal drier 1014；The arrival end of flowmeter 1016 is connected to sampling pump 1015, outlet end and coupling and catalyzing
Reaction component 103 is connected to.
The sample gas that SCR inlet stack sampling component 101 obtains is higher concentration NOxSample gas, flowmeter 1016 can control
The uninterrupted of required sample gas, higher concentration NO needed for meetingxSample tolerance.
SCR exhaust pass sampling assemble 102 includes sampling probe 1022, water removal drier 1024 and sampling pump 1025；It takes
Sample probe 1022 is mounted on SCR exhaust pass and protrudes into SCR exhaust pass；The arrival end of sampling probe 1022 was equipped with
Filter 1021, filter 1021 are located in SCR exhaust pass；It removes water drier 1024 and passes through heat traced pipeline 1023 and sampling probe
1022 connections；Sampling pump 1025 is connected to water removal drier 1024, the outlet end of sampling pump 1025 and coupling catalytic reactions component
103 connections.The low concentration of NO of the extraction certain flow of SCR exhaust pass sampling assemble 102xAnd NH3Sample gas.
In first paths, under the effect and oxygen existence condition of catalyst, NH3Preferential and NOxIt is anti-that reduction removing occurs
It answers, generates nitrogen and water, and the oxygen in flue gas of getting along well carries out oxidation reaction, key reaction formula are as follows:
4NO+4NH3+O2=4N2+6H2O (1)
2NO2+4NH3+O2=3N2+6H2O (2)
Since in flue gas 95% or more nitrogen oxides exists in the form of NO, NH3And NOxReaction molar ratio can
Consider by 1:1.
Specific example is provided below to the NH of above-mentioned SCR reactor3Concentration on-line period measuring device is illustrated:
After power plant carries out minimum discharge transformation, NOxConcentration of emission is controlled in 50mg/Nm3Hereinafter, usually being controlled when operation
In 40mg/Nm3It controls, then SCR reactor outlet sample gas NOxMolal quantity be 0.87 or so.SCR reactor requires outlet NH3It is dense
Degree control is in 2.28mg/Nm3Hereinafter, but due to SCR reactor inlet flue gas flow field and NOxConcentration field is irregular, leads to NOxWith NH3
Incomplete mixing causes reaction not exclusively, NH3Escape is usually all higher than 2.28mg/Nm3, some up to 15.96mg/Nm3, molal quantity
About 0.94.According to NH3And NOxReaction molar ratio be 1:1, then have about 0.07 mole of NH3Have neither part nor lot in reaction.Simultaneously somely
Area or coal-burning power plant further increase requirement, NOxConcentration of emission is controlled in 10mg/Nm3Hereinafter, this is to NH3The measurement of concentration mentions
Requirements at the higher level out.Such as NOxConcentration of emission is controlled in 10mg/Nm3Hereinafter, then SCR exports sample gas NOxMolal quantity be about 0.22.It presses
According to NH3And NOxReaction molar ratio be 1:1, then have 0.72 mole of NH3Have neither part nor lot in reaction.And if do not introduce SCR inlet flue gas with
The mixing of SCR exiting flue gas, improves sample gas NOxConcentration guarantees the NH in flue gas3It is sufficiently reacted, then can obtain NH3Concentration is
0.22 mole, i.e. 3.74mg/Nm3Conclusion.Therefore, the sampling and measuring device based on the measuring principle will guarantee that measurement is reliable,
Measurement accuracy is improved, sample gas NO must be just improvedxConcentration, by introducing SCR inlet higher concentration NOxSample gas adjusts flowmeter 1016
It conveys a certain amount of sample gas to mix with the outlet SCR sample gas, guarantees NH in aggregate sample gas3Sufficiently reaction.
The embodiment of the present invention also provides a kind of NH of SCR reactor3Concentration on-line period measurement method, comprising: SCR is entered
Mouth flue and SCR exhaust pass are separately sampled, are divided into two-way after mixing two kinds of sample gas and each lead into NOxAnalyzer is examined
It surveys, and NH in flue gas is calculated according to two-way aggregate sample gas testing result3Concentration；Wherein, first via aggregate sample gas is in selectivity
NO is passed through after sufficiently reacting under the effect of reducing catalyst 1031 and oxygen existence conditionxAnalyzer；Second road aggregate sample gas is straight
It connects into NOxAnalyzer.
In above-mentioned technical proposal, the reaction temperature of first via aggregate sample gas is 300 DEG C -400 DEG C.By SCR inlet flue and
The sample gas that SCR exhaust pass extracts needs just to be mixed after being filtered, being dried respectively.To SCR inlet flue extract sample gas by
Flowmeter 1016 controls flow.
It is above-mentioned " NH in flue gas to be calculated according to two-way aggregate sample gas testing result3Concentration " specifically: compare two-way mixing
NO in sample gasxConcentration value, obtain the NO of only reduces in first via aggregate sample gas after catalysis reactionxConcentration value, according to NH3With
NOxReaction molar ratio be 1:1 calculate the NH in aggregate sample gas3Concentration value.SCR inlet flue gas sample flow L1,
SCR exhaust pass smoke sampling flow L2, CNH3For SCR exhaust pass flue gas NH3Concentration, C "NH3For SCR exhaust pass flue gas NH3
Concentration analyzer measured value, correction formula are as follows:
The NH of SCR reactor provided in an embodiment of the present invention3Concentration on-line period measurement method can measure SCR reaction
The NH of device outlet3Concentration.Certainly, the NH3Concentration on-line period measurement method also has related NH provided by the above embodiment3It is dense
The other effects for spending on-line period measuring device, are not repeating herein.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For method disclosed in embodiment
For, since it is corresponding with device disclosed in embodiment, so being described relatively simple, related place is said referring to device part
It is bright.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of NH of SCR reactor3Concentration on-line period measuring device characterized by comprising
Coupling catalytic reactions component；
SCR inlet stack sampling component is connected to the coupling catalytic reactions component；
SCR exhaust pass sampling assemble is connected to the coupling catalytic reactions component；
Wherein, the coupling catalytic reactions component is for mixing the SCR inlet stack sampling component and the SCR exhaust pass
The sample gas that sampling assemble extracts, and aggregate sample gas is made to each lead into NO through two pathsxAnalyzer；It is configured in first paths
Selective reduction catalyst, the second paths are straight channel.
2. the NH of SCR reactor according to claim 13Concentration on-line period measuring device, which is characterized in that described
Channel and second paths pass through switching three-way valve and the NO respectively all the wayxAnalyzer connection.
3. the NH of SCR reactor according to claim 13Concentration on-line period measuring device, which is characterized in that the coupling
Closing catalysis reaction component includes:
Shell, the two paths are separately mounted in the shell；The SCR inlet stack sampling component and the SCR go out
Mouth stack sampling component is connected to the shell respectively；
Catalyst heater, the catalyst heater are installed on first paths or the shell.
4. the NH of SCR reactor according to claim 13Concentration on-line period measuring device, which is characterized in that the SCR
Gas approach sampling assemble includes:
The sampling probe in SCR inlet flue is protruded into, the arrival end of the sampling probe is equipped with filter；
The water removal drier being connected to by heat traced pipeline with the sampling probe；
The sampling pump being connected to the water removal drier；
The flowmeter being connected to the sampling pump, the outlet end of the flowmeter are connected to the coupling catalytic reactions component.
5. the NH of SCR reactor according to claim 13Concentration on-line period measuring device, which is characterized in that the SCR
Exhaust pass sampling assemble includes:
The sampling probe in SCR exhaust pass is protruded into, the arrival end of the sampling probe is equipped with filter；
The water removal drier being connected to by heat traced pipeline with the sampling probe；
The sampling pump being connected to the water removal drier, the outlet end of the sampling pump and the coupling catalytic reactions component connect
It is logical.
6. a kind of NH of SCR reactor3Concentration on-line period measurement method characterized by comprising
It is separately sampled to SCR inlet flue and SCR exhaust pass, it is divided into two-way after mixing two kinds of sample gas and each leads into NOxAnalysis
Instrument is detected, and calculates NH in flue gas according to two-way sample gas testing result3Concentration；
Wherein, first via aggregate sample gas the effect of selective reduction catalyst and under oxygen existence condition sufficiently react after lead to
Enter the NOxAnalyzer；Second road aggregate sample gas is passed directly into the NOxAnalyzer.
7. the NH of SCR reactor according to claim 63Concentration on-line period measurement method, which is characterized in that the first via
The reaction temperature of aggregate sample gas is 300 DEG C -400 DEG C.
8. the NH of SCR reactor according to claim 63Concentration on-line period measurement method, which is characterized in that by described
The sample gas that SCR inlet flue and the SCR exhaust pass extract needs to be filtered respectively, dry after mixed.
9. the NH of SCR reactor according to claim 63Concentration on-line period the measurement method, which is characterized in that " root
NH in flue gas is calculated according to two-way sample gas testing result3Concentration " specifically:
Compare NO in two-way aggregate sample gasxConcentration value, obtain the NO of only reduces in first via aggregate sample gas after catalysis reactionx's
Concentration value, according to NH3And NOxReaction molar ratio be 1:1 calculate the NH in aggregate sample gas3Concentration value.
10. the NH of SCR reactor according to claim 63Concentration on-line period measurement method, which is characterized in that SCR
The sample gas that gas approach extracts controls flow by flowmeter.
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