CN105628455B - A kind of full-scale smoke components measuring device of large flue - Google Patents
A kind of full-scale smoke components measuring device of large flue Download PDFInfo
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- CN105628455B CN105628455B CN201610080879.4A CN201610080879A CN105628455B CN 105628455 B CN105628455 B CN 105628455B CN 201610080879 A CN201610080879 A CN 201610080879A CN 105628455 B CN105628455 B CN 105628455B
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- 239000000779 smoke Substances 0.000 title claims abstract description 70
- 238000005070 sampling Methods 0.000 claims abstract description 98
- 239000003546 flue gas Substances 0.000 claims abstract description 22
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000003344 environmental pollutant Substances 0.000 claims description 4
- 231100000719 pollutant Toxicity 0.000 claims description 4
- 235000019504 cigarettes Nutrition 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 33
- 238000000034 method Methods 0.000 abstract description 10
- 239000003517 fume Substances 0.000 abstract description 3
- 239000000523 sample Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000001815 facial effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
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- 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
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Pathology (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Molecular Biology (AREA)
- Biomedical Technology (AREA)
- Combustion & Propulsion (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The present invention provides a kind of full-scale smoke components measuring device of large flue, to measure smoke components in a flue；It include: that an at least smoke components collect measuring unit；At least sampling line being extending at least partially into inside the flue；The sampling line includes collecting the main line that measuring unit is connected to the smoke components；It is evenly arranged in more branch pipelines being connected in a cross section of the flue with the main line；The multiple sampling holes being distributed in aforementioned cross-sectional are offered in the more branch pipelines.It can be realized the precise measurement of smoke components, the technique adjustment for flue gas emission control and fume treatment provides reliable basis.
Description
Technical field
The present invention relates to smoke components field of measuring technique, and in particular to a kind of full-scale smoke components measurement dress of large flue
It sets.
Background technique
Measurement for coal steam-electric plant smoke ingredient, mainly for the pollutant (SO in flue gas2、NOxDeng), oxygen amount, moisture with
And unreacted ammonia of denitration etc..The state that puts into operation of thermal power plant's environmental protection facility, need to be according to the on-line measurement result of above-mentioned smoke components
It is adjusted in real time, to reach optimal discharge control level.As the control of Air Pollutant Emission level is got in China
Come stringenter, the measurement of smoke components is just gradually taken seriously.
Currently, there are some disadvantages for existing smoke components on-line measurement means, comprising: point layout is only close to flue one
Side, and protrude into that the sampling part inside flue is too short, the smoke components of flue center and opposite side are unable to measure, does not have and represents
Property；Measuring point is very little, and the actual value of entire flue cross section is often replaced with the measurement result of one or two of measuring point, so that test data
It is fluctuated with the smoke components fluctuation at point position, causes the inaccuracy of test result and the violent wave of test result
It is dynamic.Therefore, as power plant units scale is increasing, flue cross section is gradually increased, disadvantages mentioned above is existing with regard to more obvious
Smoke components on-line measurement means have been unable to satisfy the requirement for accurately measuring flue gas in flue ingredient at this stage.
Summary of the invention
For deficiency existing for existing online smoke components measurement means, the object of the present invention is to provide a kind of large flue is complete
Size smoke components measuring device, can be realized the precise measurement of smoke components, for flue gas emission control and the work of fume treatment
Skill adjustment provides reliable basis.
In order to achieve the above objectives, this invention takes following technical schemes:
A kind of full-scale smoke components measuring device of large flue, to measure smoke components in a flue；Include:
An at least smoke components collect measuring unit；
At least sampling line being extending at least partially into inside the flue；
The sampling line includes collecting the main line that measuring unit is connected to the smoke components；It is evenly arranged in institute
State more branch pipelines being connected in a cross section of flue with the main line；It is offered in the more branch pipelines before being distributed in
State multiple sampling holes in cross section.
Further, the opening direction of the sampling hole is consistent with flue gas flow direction in the flue.
Further, the multiple sampling hole array is uniformly distributed or annular is distributed in the cross section.
Further, the area of section of the flue is more than or equal to 0.3m2。
Further, the smoke components collect content of the measuring unit to measure pollutant in flue.
Further, the branch pipeline is cross-section pipe, and the proportionate relationship between the opening area of each sampling hole is full
Foot: the flue gas flow rate in each sampling hole is identical.
Further, the branch pipeline is ladder pipe, and the quantity of the sampling hole including being arranged in any branch pipeline is corresponding
More piece pipeline section, the proportionate relationship respectively saved between the area of section of pipeline section meet: the flue gas stream in the cross section in each sampling hole
Speed is identical.
Further, the flue is rectangular duct, and the sampling hole array is distributed in the cross section, described transversal
Face is divided into the rectangular area of multiple homalographics corresponding with the sampling hole number and position, and the area of the rectangular area is
0.08-1.0m2。
Further, the flue is circular pipe, and the sampling hole annular is distributed in the cross section, described transversal
Face is divided into annular or fan-shaped region, the annular or the fan section of multiple homalographics corresponding with the sampling hole number and position
The area in domain is 0.1-1.57m2。
Further, the smoke components are collected measuring unit and are located at outside the flue.
By taking above-mentioned technical proposal, the invention has the following advantages:
(1) it is designed by using more branch pipelines, is provided with multiple sampling holes in every branch pipeline, can accomplish to flue
The all standing in section, area covering degree are increased substantially compared with the prior art.
(2) sampling hole of flue gas process, branch pipeline, main line summarize the smoke components for flowing into and arranging outside flue and collect survey
Unit is measured, the measurement result of smoke components is the average result for the flue gas that more sampling holes obtain, i.e., flat in entire flue cross section
As a result, and above-mentioned average result be it is average in real time, rather than mathematic(al) mean (mathematic(al) mean i.e. it is believed that repeatedly to a measuring point into
Multiple measurement results, are finally averaged by row measurement again；Or after using same measuring device measuring multiple measuring points respectively, then
Multiple measurement results are averaged.Due in flue flue gas flow rate be not it is uniform, smoke distribution is also real-time change, in this way
Be very likely to and will lead to measurement result inaccuracy), effectively prevent at spot sample hole smoke components fluctuation and caused by measurement
As a result it fluctuates, measurement result is more accurate, more representative.
(3) whole device is convenient to process and mount, adaptable.In engineer application, it can be adjusted flexibly according to the actual situation
The arrangement quantity of sampling hole, probe tube, the method that subregion arrangement can also be used are adaptable.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the full-scale smoke components measuring device of large flue in one embodiment of the invention.
Fig. 2 is the structural schematic diagram of the branch pipeline of the cross-section form of tubes in one embodiment of the invention.
Fig. 3 is the structural schematic diagram of the branch pipeline of the ladder tubular formula in another embodiment of the present invention.
Fig. 4 is the arrangement schematic diagram of the full-scale smoke components measuring device of large flue in one embodiment of the invention.
Fig. 5 is the structural schematic diagram of the full-scale smoke components measuring device of large flue in further embodiment of this invention.
Fig. 6 is the structural schematic diagram of the full-scale smoke components measuring device of large flue in further embodiment of this invention.
Specific embodiment
To enable features described above and advantage of the invention to be clearer and more comprehensible, special embodiment below, and institute's attached drawing is cooperated to make
Detailed description are as follows.
As shown in Fig. 1 and Fig. 4, in one embodiment, a kind of full-scale smoke components measuring device of large flue is provided, used
To measure smoke components in a flue 1；It include: that smoke components collect measuring unit 4；Partially protrude into the probe tube inside flue 1
Road 2；Sampling line 2 includes collecting the main line that measuring unit 4 is connected to smoke components；Be evenly arranged in flue 1 one is horizontal
More branch pipelines being connected in section with main line；Be distributed in aforementioned cross-sectional multiple are offered in more branch pipelines to take
Sample hole 3.Smoke components collect content of the measuring unit 4 to measure various pollutants in flue gas, are currently known instrument, such as
Fume component analysis instrument can choose its dimension in practical applications according to different flow.Its specific structure and function are this
It known by the technical staff of field, and is widely applied in the Practical Project for measuring, analyzing to smoke components at present, herein not
It repeats again.
Smoke components are collected measuring unit 4 and are arranged in outside flue 1, and sampling hole 3 is to carry out flow arrangement backwards to flue gas, i.e., it is open
Direction is consistent with flue gas flow direction in the flue 1.In sampling line 2, especially branch pipeline can be taken etc. according to actual needs and cut
Two kinds of forms of facial canal or ladder pipe.For example, as shown in Fig. 2, in some embodiments, branch pipeline 5 is cross-section pipe, and section is
Rectangle, circle or the similar round of rule.When opening up sampling hole 3, guarantee the proportionate relationship between the opening area of each sampling hole 3
Meet: the flue gas flow rate in each sampling hole 3 is identical.The exhaust gas volumn into each sampling hole 3 can be made to be consistent.
In another example as shown in figure 3, in another embodiment, branch pipeline 6 is to be arranged on ladder pipe, including any branch pipeline
Sampling hole 3 the corresponding more piece pipeline section of quantity, the proportionate relationship between each area of section for saving pipeline section meets: in the branch pipeline
Each sampling hole 3 in flue gas flow rate it is identical, be consistent the exhaust gas volumn into each sampling hole 3.
In previous embodiment, a set of sampling line 2 and the sampling hole 3 being arranged thereon can be by the complete subregions of flue 1.Actually answer
In, the number of sampling line 2 is according to the rationally setting of flue cross section product, and sampling hole 3 is also according to the rationally setting of flue cross section product.
For example, it is added that when 1 length and width of flue are bigger, then sampling line is carried out subregion arrangement in embodiment.Specifically follow
Following rule: when length-width ratio is less than 1.5, then only arrange that a set of smoke components collect measuring unit and sampling line；Such as Fig. 5 institute
Show, when length-width ratio is 1.5 to 2.5, then the cross section of flue is divided into two subregions, it is single to arrange that two sets of smoke components collect measurement
Member 4 and sampling line 2, as long as guaranteeing that sampling hole 3 is evenly arranged in a cross section of flue 1；If length-width ratio is greater than
2.5, then correspondingly arrange that three sets of smoke components collect measuring unit and sampling line.According to flue length-width ratio, choose whether pair
Sampling line carries out subregion arrangement, keeps measurement result more representative, and be able to reflect the same cross section different subregions of flue
Smoke components difference.
Device when in use, the sampled hole 3 of flue gas, sampling line 2, summarize flow into smoke components collect measuring unit 4 into
Row analysis measurement.The measurement result of smoke components is the real-time average result of more sampling holes, i.e., being averaged in entire flue cross section
As a result, effectively prevent at spot sample hole smoke components fluctuation and caused by measurement result fluctuate, measurement result is more accurate,
It is more representative.
Following table is the measurement using existing sampling method and the sampling method of the present apparatus to SCR reactor inlet nitrogen oxides
As a result, as can be seen from the table, since existing sampling method only measures the smoke components of special position point, can not disappear
Except the fluctuation of smoke components, the unstable of measurement result is caused；Using in embodiment shown in FIG. 1 device carry out flue gas at
Divide measurement, since measurement result is the real-time average result of more sampling holes, i.e., the average result in entire flue cross section is evaded
Single sample point smoke components fluctuate the influence to measurement result, and measurement result is more stable, more acurrate.
| Time of measuring | NOx concentration mg/Nm3 |
| 10:05 | 398 |
| 10:10 | 356 |
| 10:15 | 420 |
| 10:20 | 370 |
The existing sampling method measurement result of table 1 (measurement position: SCR reactor inlet)
| Time of measuring | NOx concentration mg/Nm3 |
| 11:05 | 385 |
| 11:10 | 392 |
| 11:15 | 390 |
| 11:20 | 386 |
Device measurement result (measurement position: SCR reactor inlet) in 2 embodiments shown in FIG. 1 of table
As shown in fig. 6, in another embodiment, when measuring device is arranged in circular flue, then sampling hole 3 is equal using annular
The arrangement of cloth, sampling line 2 go deep into the branch pipeline in flue be it is arc-shaped, can effectively cover flue cross section, improve and survey
Measure accuracy.
In Practical Project, samples bore dia and quantity, sampling line diameter and quantity, sampling line arrangement can bases
Numerical simulation result, Logistics automatic system result and on-site actual situations are chosen.
Specific arrangement specification of the sampling hole in flue is as follows:
1) rectangular or square flue
Flue cross section is divided into an appropriate number of homalographic region, using the center in each region as measuring point.It is arranged at measuring point
Sampling hole.The quantity in homalographic region is chosen by table 3, and general measuring point is no more than 20.
| Flue cross section area m2 | Homalographic region long side length m | Measuring point sum |
| 0.5~1.0 | <0.50 | 4~6 |
| 1.0~4.0 | <0.67 | 6~9 |
| 4.0~9.0 | <0.75 | 9~16 |
| >9.0 | ≤1.0 | ≤20 |
The homalographic region specification and measuring point number of 3 square of table (side) shape flue
2) circular flue
Flue cross section is divided into an appropriate number of homalographic annular concentric or fan-shaped region, each measuring point is selected in each homalographic
On the intersection point of heart line and two straight lines of perpendicular intersection, wherein a diameter line should change maximum plane in expected concentration
It is interior.The projected position in sampling hole or corresponding sample hole is arranged at measuring point.The homalographic number of rings of the circular flue of different-diameter is surveyed
Amount diameter number and measuring point number are shown in Table 4, and general measuring point is no more than 20.
| Flue diameter m | Homalographic number of regions | Measure diameter number | Measuring point number |
| 0.3~0.6 | 1~2 | 1~2 | 2~8 |
| 0.6~1.0 | 2~3 | 1~2 | 4~12 |
| 1.0~2.0 | 3~4 | 1~2 | 6~16 |
| 2.0~4.0 | 4~5 | 1~2 | 8~20 |
| >4.0 | 5 | 1~2 | 10~20 |
4 circular flue of table divides ring and measuring point number
As previously mentioned, can according to sampling exhaust gas volumn selection cross-section branch pipeline or ladder pipe branch pipeline, branch pipeline section with
The relationship of sampling hole opening area is specifically described with following embodiment:
1, branch pipeline cross-section, sampling hole opening are different
Certain rectangular flue, length and width are 2m, and being disposed with smoke components measuring device, (its specific structure is referring to aforementioned each implementation
Example), branch pipeline is set, which is 4, is evenly arranged, and branch pipeline is prismatic round tube, diameter 0.1m.
Every branch pipeline is provided with 4 sampling holes, and sampling hole is evenly arranged that (substantial sampling hole, which is generally evenly distributed in, to be taken along branch pipeline pipe
Cross section where sample pipeline), sampling hole opening area.The farthest sampling hole of measuring unit is collected from apart from smoke components, until most
Close sampling hole, sampling bore dia are followed successively by 0.062m, 0.055m, 0.05m, 0.044m.It is arranged, can protect according to this parameter
The flue gas flow that card enters each sampling hole is consistent.
2, branch pipeline variable cross-section, sampling hole opening are identical
Certain rectangular flue, length and width are 2m, and being disposed with smoke components measuring device, (its specific structure is referring to aforementioned each implementation
Example), it is provided with branch pipeline, the quantity of branch pipeline is 4, is evenly arranged, every branch pipeline is provided with 4 sampling holes, sampling hole
It is evenly arranged (cross section where substantial sampling hole is generally evenly distributed in sampling line) along branch pipeline, each bore dia that samples is
0.05m.Branch pipeline is then uniformly divided into 4 sections by length direction, and every section of diameter difference collects measuring unit most from apart from smoke components
Remote pipeline section, until nearest pipeline section, diameter are followed successively by 0.115m, 0.11m, 0.105m, 0.1m.It is arranged according to this parameter,
It can guarantee that the flue gas flow for entering each sampling hole is consistent.
3, probe tube variable cross-section, sampling hole opening are different
Certain rectangular flue, length and width are 2m, and being disposed with smoke components measuring device, (its specific structure is referring to aforementioned each implementation
Example), it is provided with branch pipeline, the quantity of branch pipeline is 4, is evenly arranged, every branch pipeline is provided with 4 sampling holes, branch pipeline
4 pipeline sections, every section of diameter difference are uniformly divided by length direction.Every branch pipeline is provided with 4 sampling holes, and sampling hole edge is in charge of
Road is evenly arranged.Collect the farthest pipeline section of measuring unit from apart from smoke components, until nearest pipeline section, diameter be followed successively by 0.11m,
0.106m,0.103m,0.1m.The farthest sampling hole of measuring unit is collected from apart from smoke components, until nearest sampling hole, sampling
Bore dia is followed successively by 0.055m, 0.052m, 0.05m, 0.047m.It is arranged according to this parameter, it is ensured that enter each sampling
The flue gas flow in hole is consistent.
It should be noted that it is described above, it is preferable case study on implementation of the invention, is not intended to limit the invention in any way, it is all
It is any simple modification to the above embodiments, change and equivalent structural changes according to the technical essence of the invention, still
Belong in the protection scope of technical solution of the present invention.
Claims (5)
1. a kind of full-scale smoke components measuring device of large flue, to measure smoke components in a flue；It is characterized in that, packet
It includes:
An at least smoke components collect measuring unit；
At least sampling line being extending at least partially into inside the flue；When the flue length-width ratio is less than 1.5, smoke components
It collects measuring unit and sampling line quantity is 1；When the flue length-width ratio is 1.5 to 2.5, smoke components collect measuring unit
And sampling line quantity is 2；If length-width ratio is greater than 2.5, smoke components collect measuring unit and sampling line quantity is 3；
The sampling line includes collecting the main line that measuring unit is connected to the smoke components；It is evenly arranged in the cigarette
More branch pipelines being connected in one cross section in road with the main line；It is offered in the more branch pipelines and is distributed in aforementioned cross
Multiple sampling holes in section；
When the flue is rectangular duct, the sampling hole array is distributed in the cross section, and the cross section is divided into and institute
The rectangular area of sampling hole number and the corresponding multiple homalographics in position is stated, the area of the rectangular area is 0.08-1.0m2；
When the area of section of the flue is 0.5-1m2When, the quantity in the homalographic region is 4-6, the length of the rectangular area
Edge lengths are less than 0.5m；When the area of section of the flue is 1-4m2When, the quantity in the homalographic region is 6-9, described
The long side length of rectangular area is less than 0.67m；When the area of section of the flue is 4-9m2When, the number in the homalographic region
Amount is 9-16, and the long side length of the rectangular area is less than 0.75m；When the area of section of the flue is greater than 9m2When, it is described
The quantity in homalographic region is no more than 20, and the long side length of the rectangular area is no more than 1.0m；
When the flue is circular pipe, the sampling hole annular is distributed in the cross section, and the cross section is divided into and institute
Annular or the fan-shaped region of sampling hole number and the corresponding multiple homalographics in position are stated, annular or fan-shaped region the area is
0.1-1.57m2；When the diameter of the flue is 0.3-0.6m, the quantity of annular or fan-shaped region is 1-2, samples hole count
Amount is 2-8；When the diameter of the flue is 0.6-1m, the quantity of annular or fan-shaped region is 2-3, and sampling hole number is
4-12；When the diameter of the flue is 1-2m, the quantity of annular or fan-shaped region is 3-4, and sampling hole number is 6-16
It is a；When the diameter of the flue is 2-4m, the quantity of annular or fan-shaped region is 4-5, and sampling hole number is 8-20；When
When the diameter of the flue is greater than 4m, the quantity of annular or fan-shaped region is 5, and sampling hole number is 10-20；
The opening direction of the sampling hole is consistent with flue gas flow direction in the flue；The branch pipeline is ladder pipe, including any
The corresponding more piece pipeline section of the quantity for the sampling hole being arranged in branch pipeline, the proportionate relationship respectively saved between the area of section of pipeline section are full
Foot: the flue gas flow rate in the cross section in each sampling hole is identical.
2. the full-scale smoke components measuring device of large flue as described in claim 1, which is characterized in that the multiple sampling hole
Array is uniformly distributed or annular is distributed in the cross section.
3. the full-scale smoke components measuring device of large flue as described in claim 1, which is characterized in that the section of the flue
Area is more than or equal to 0.3m2。
4. the full-scale smoke components measuring device of large flue as described in claim 1, which is characterized in that the smoke components are received
Collect content of the measuring unit to measure pollutant in flue.
5. the full-scale smoke components measuring device of large flue as described in claim 1, which is characterized in that the smoke components are received
Collection measuring unit is located at outside the flue.
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| CN201610080879.4A CN105628455B (en) | 2016-02-04 | 2016-02-04 | A kind of full-scale smoke components measuring device of large flue |
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| CN201610080879.4A CN105628455B (en) | 2016-02-04 | 2016-02-04 | A kind of full-scale smoke components measuring device of large flue |
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| CN109696332A (en) * | 2018-03-16 | 2019-04-30 | 中电华创电力技术研究有限公司 | A kind of unit-combination type flue gas flow equalizing system |
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