CN215894315U - NOx rapid measurement instrument based on dilution sampling and mounting structure thereof - Google Patents
NOx rapid measurement instrument based on dilution sampling and mounting structure thereof Download PDFInfo
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- CN215894315U CN215894315U CN202121616691.XU CN202121616691U CN215894315U CN 215894315 U CN215894315 U CN 215894315U CN 202121616691 U CN202121616691 U CN 202121616691U CN 215894315 U CN215894315 U CN 215894315U
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- flue gas
- pipe section
- compressed air
- sampling
- nox
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- 238000005070 sampling Methods 0.000 title claims abstract description 59
- 238000010790 dilution Methods 0.000 title claims abstract description 21
- 239000012895 dilution Substances 0.000 title claims abstract description 21
- 238000005259 measurement Methods 0.000 title claims abstract description 21
- 239000003546 flue gas Substances 0.000 claims abstract description 105
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 98
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000001301 oxygen Substances 0.000 claims abstract description 43
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 43
- 239000007789 gas Substances 0.000 claims abstract description 40
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Abstract
The utility model discloses a NOx rapid measuring instrument based on dilution sampling and a mounting structure thereof, wherein the NOx rapid measuring instrument based on dilution sampling at least comprises an original flue gas sampling pipe section, a first oxygen measuring element, a second oxygen measuring element, a compressed air ejector, a compressed air pipe section, a dilution flue gas pipe section and a NOx rapid sensing element; the first oxygen measuring element is arranged on the original flue gas sampling pipe section; the second oxygen measuring element and the NOx rapid sensing element are both arranged on the diluted flue gas pipe section; the compressed air ejector is provided with a compressed air inlet, a sampling gas inlet and a mixed gas outlet; the compressed air inlet is communicated with the compressed air pipe section; the sampling gas inlet is communicated with the original flue gas sampling pipe section; the mixed gas outlet is communicated with the diluted flue gas pipe section. The instrument is mainly used for measuring the concentration of NOx in denitration flue gas and has the advantages of accurate measurement, rapid response, high reliability, long service life and the like.
Description
Technical Field
The utility model relates to a NOx rapid measuring instrument based on dilution sampling and a mounting structure thereof, belonging to the technical field of flue gas component measurement.
Background
The common NOx rapid sensing element on the market is made of special semiconductor ceramic materials or designed based on the ultraviolet difference principle, and is easy to be subjected to other atmospheres (such as H) while measuring the concentration of NOx in flue gas2O、SO2CO, etc.) that have a small effect on the NOx normal measurement signal at low concentrations, but increase in geometric order with increasing concentrations of interfering gases and shorten the useful life of the NOx fast sensing element.
SUMMERY OF THE UTILITY MODEL
The utility model provides a NOx rapid measuring instrument based on dilution sampling and an installation structure thereof, which have the advantages of accurate measurement, rapid response, high reliability, long service life and the like and are mainly used for measuring the concentration of NOx in denitration flue gas.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows:
a NOx rapid measuring instrument based on dilution sampling at least comprises an original flue gas sampling pipe section, a first oxygen measuring element, a second oxygen measuring element, a compressed air ejector, a compressed air pipe section, a dilution flue gas pipe section and a NOx rapid sensing element;
the first oxygen measuring element is arranged on the original flue gas sampling pipe section; the second oxygen measuring element and the NOx rapid sensing element are both arranged on the diluted flue gas pipe section;
the compressed air ejector is provided with a compressed air inlet, a sampling gas inlet and a mixed gas outlet; the compressed air inlet is communicated with the compressed air pipe section; the sampling gas inlet is communicated with the original flue gas sampling pipe section; the mixed gas outlet is communicated with the diluted flue gas pipe section.
In the above scheme, the raw flue gas sampling pipe section, the sampling gas inlet, the mixed gas outlet and the diluted flue gas pipe section are connected in sequence, that is, the jet flow is mixed and then measured.
As another implementation scheme, the NOx rapid measuring instrument based on dilution sampling further comprises a compressed air branch pipe; one end of the diluted flue gas pipe section is communicated with the original flue gas sampling pipe section, and the other end of the diluted flue gas pipe section is communicated with the sampling gas inlet; one end of the compressed air branch pipe is communicated with the compressed air pipe section, the other end of the compressed air branch pipe is communicated with the top of the diluted flue gas pipe section, and the second oxygen measuring element and the NOx quick sensing element are both positioned at the downstream of the communicated position of the compressed air branch pipe and the diluted flue gas pipe section.
In the scheme, the original flue gas sampling pipe section, the diluted flue gas pipe section, the sampling gas inlet and the mixed gas outlet are connected in sequence, namely measurement is carried out before jet mixing.
In the above scheme, part of the compressed air is led to the original flue gas in the diluted flue gas sampling pipe section from the top of the diluted flue gas pipe section through the compressed air branch pipe, and part of the compressed air enters the compressed air ejector through the compressed air inlet to be used for jetting to generate negative pressure.
The instrument is used for measuring the concentration of NOx in the flue gas of the boiler.
The present application is connected, meaning connected and communicated.
The instrument is used for measuring the concentration of NOx in the flue gas of the boiler.
The applicant finds that after the original flue gas is diluted by the compressed air, the concentration of the gas disturbing the measurement of the NOx concentration is reduced, the NOx concentration is measured at the flue gas dilution section, although the measurement value is reduced, the measurement stability is greatly enhanced, the NOx concentration in the original flue gas can be calculated according to the oxygen amount before and after the dilution of the compressed air, and the specific mathematical relationship is as follows: the concentration of NOx in the original flue gas is equal to the concentration of NOx in the diluted flue gas x (20.9% -dilution of O in the flue gas)2Concentration)/(20.9% -O in original flue gas2Concentration) —. The concentration of NOx in the diluted flue gas is obtained by a NOx quick sensing element, and O in the original flue gas2The concentration is obtained by a first oxygen measuring element to dilute O in the flue gas2The concentration is taken by the second oxygen measuring element.
The NOx quick sensing element and the second oxygen measuring element can be designed integrally or separately.
To facilitate the reading, both the first oxygen measuring element and the second oxygen measuring element are oxygen concentration measuring instruments.
Above-mentioned NOx rapid survey instrument's mounting structure based on dilute sample, compressed air ejector installs in the flue gas pipeline outside, and air compressor is connected to the compressed air pipeline section, and former flue gas sample pipeline section stretches into the flue gas pipeline inboard.
In order to avoid the pollution of the surrounding environment and improve the safety, when the mixed gas outlet is communicated with the diluted flue gas pipe section, the diluted flue gas pipe section is communicated to the inner side of the flue gas pipeline; when the sampling gas inlet is communicated with the diluted flue gas pipe section, the mixed gas outlet is communicated to the inner side of the flue gas pipe through a pipeline.
The prior art is referred to in the art for techniques not mentioned in the present invention.
The NOx rapid measuring instrument based on dilution sampling is mainly used for measuring NOx concentration of denitration flue gas, the concentration of gas disturbing the NOx concentration measurement is reduced after the raw flue gas is diluted by compressed air, the measurement stability is greatly enhanced, and the NOx rapid measuring instrument has the advantages of accuracy in measurement, rapidness in response, high reliability, long service life and the like.
Drawings
FIG. 1 is a schematic structural diagram of a NOx rapid measuring instrument based on dilution sampling in example 1 of the present invention;
FIG. 2 is a schematic structural diagram of a NOx rapid measuring instrument based on dilution sampling in example 2 of the present invention;
in the figure, 1 is a compressed air pipe section, 2 is a raw flue gas sampling pipe section, 3 is a diluted flue gas pipe section, 4 is a compressed air ejector, 5 is a compressed air inlet, 6 is a sampling gas inlet, 7 is a mixed gas outlet, and 8 is a compressed air branch pipe; 11 is a first oxygen measuring element, 12 is a second oxygen measuring element, and 13 is a NOx fast sensing element.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
Example 1
As shown in fig. 1, a NOx rapid measuring instrument based on dilution sampling at least comprises a raw flue gas sampling pipe section, a first oxygen measuring element, a second oxygen measuring element, a compressed air ejector, a compressed air pipe section, a diluted flue gas pipe section and a NOx rapid sensing element;
the first oxygen measuring element is arranged on the original flue gas sampling pipe section; the second oxygen measuring element and the NOx rapid sensing element are both arranged on the diluted flue gas pipe section;
the compressed air ejector is provided with a compressed air inlet, a sampling gas inlet and a mixed gas outlet; the compressed air inlet is communicated with the compressed air pipe section; the sampling gas inlet is communicated with the original flue gas sampling pipe section; the mixed gas outlet is communicated with the diluted flue gas pipe section.
Example 2
As shown in fig. 2, a NOx rapid measuring instrument based on dilution sampling at least comprises a raw flue gas sampling pipe section, a first oxygen measuring element, a second oxygen measuring element, a compressed air ejector, a compressed air pipe section, a diluted flue gas pipe section, a NOx rapid sensing element and a compressed air branch pipe;
the first oxygen measuring element is arranged on the original flue gas sampling pipe section; the second oxygen measuring element and the NOx rapid sensing element are both arranged on the diluted flue gas pipe section;
the compressed air ejector is provided with a compressed air inlet, a sampling gas inlet and a mixed gas outlet;
the compressed air inlet is communicated with the compressed air pipe section; one end of the diluted flue gas pipe section is communicated with the original flue gas sampling pipe section, and the other end of the diluted flue gas pipe section is communicated with the sampling gas inlet; one end of the compressed air branch pipe is communicated with the compressed air pipe section, the other end of the compressed air branch pipe is communicated with the top of the diluted flue gas pipe section, and the second oxygen measuring element and the NOx quick sensing element are both positioned at the downstream of the communicated position of the compressed air branch pipe and the diluted flue gas pipe section.
Example 3
Essentially the same as in example 1 or 2, except that: the NOx fast sensing element and the second oxygen measuring element are of an integrated structure.
Example 4
Essentially the same as in example 1 or 2, except that: the first oxygen measuring element and the second oxygen measuring element are both oxygen concentration measuring instruments. The NOx fast sensing element is a NOx concentration measuring instrument.
Example 5
In the installation structure of the NOx rapid measurement instrument based on dilution sampling in embodiments 1 to 4, the compressed air ejector is installed outside the flue gas pipeline, the compressed air pipe section is connected to the air compressor, and the original flue gas sampling pipe section extends into the inside of the flue gas pipeline.
Example 6
On the basis of the embodiment 5, the following improvements are further made: when the mixed gas outlet is communicated with the diluted flue gas pipe section, the diluted flue gas pipe section is communicated to the inner side of the flue gas pipeline; when the sampling gas inlet is communicated with the diluted flue gas pipe section, the mixed gas outlet is communicated to the inner side of the flue gas pipe through a pipeline.
During the measurement, former flue gas dilutes the back through compressed air, also descends to the gas concentration that NOx concentration measurement disturbed, dilutes the flue gas section and surveys and get NOx concentration, though measured value diminishes, its measurement stability strengthens greatly, and the NOx concentration in the former flue gas can be calculated according to the size of compressed air oxygen volume before and after diluting, and specific mathematical relationship is: the concentration of NOx in the original flue gas is equal to the concentration of NOx in the diluted flue gas x (20.9% -dilution of O in the flue gas)2Concentration)/(20.9% -O in original flue gas2Concentration) —. The concentration of NOx in the diluted flue gas is obtained by a NOx quick sensing element, and O in the original flue gas2The concentration is obtained by a first oxygen measuring element to dilute O in the flue gas2The concentration is taken by the second oxygen measuring element. The instruments in the above embodiments are mainly used for measuring NOx concentration in denitration flue gas, and have the advantages of accurate measurement, rapid response, high reliability, long service life and the like.
Claims (6)
1. The utility model provides a NOx rapid survey meter based on dilute sample which characterized in that: the device at least comprises an original flue gas sampling pipe section, a first oxygen measuring element, a second oxygen measuring element, a compressed air ejector, a compressed air pipe section, a diluted flue gas pipe section and a NOx quick sensing element;
the first oxygen measuring element is arranged on the original flue gas sampling pipe section; the second oxygen measuring element and the NOx rapid sensing element are both arranged on the diluted flue gas pipe section;
the compressed air ejector is provided with a compressed air inlet, a sampling gas inlet and a mixed gas outlet; the compressed air inlet is communicated with the compressed air pipe section; the sampling gas inlet is communicated with the original flue gas sampling pipe section; the mixed gas outlet is communicated with the diluted flue gas pipe section.
2. The dilution-sampling-based NOx rapid measurement instrument of claim 1, wherein: the device also comprises a compressed air branch pipe; one end of the diluted flue gas pipe section is communicated with the original flue gas sampling pipe section, and the other end of the diluted flue gas pipe section is communicated with the sampling gas inlet; one end of the compressed air branch pipe is communicated with the compressed air pipe section, the other end of the compressed air branch pipe is communicated with the top of the diluted flue gas pipe section, and the second oxygen measuring element and the NOx quick sensing element are both positioned at the downstream of the communicated position of the compressed air branch pipe and the diluted flue gas pipe section.
3. The dilution-sampling-based NOx rapid measurement instrument according to claim 1 or 2, wherein: the NOx fast sensing element and the second oxygen measuring element are of an integrated structure.
4. The dilution-sampling-based NOx rapid measurement instrument according to claim 1 or 2, wherein: the first oxygen measuring element and the second oxygen measuring element are both oxygen concentration measuring instruments.
5. The mounting structure of a dilution sampling-based NOx rapid measuring instrument according to any one of claims 1 to 4, wherein: the compressed air ejector is installed on the outer side of the flue gas pipeline, the compressed air pipe section is connected with the air compressor, and the original flue gas sampling pipe section extends into the inner side of the flue gas pipeline.
6. The mounting structure according to claim 5, wherein: when the mixed gas outlet is communicated with the diluted flue gas pipe section, the diluted flue gas pipe section is communicated to the inner side of the flue gas pipeline; when the sampling gas inlet is communicated with the diluted flue gas pipe section, the mixed gas outlet is communicated to the inner side of the flue gas pipe through a pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121616691.XU CN215894315U (en) | 2021-07-16 | 2021-07-16 | NOx rapid measurement instrument based on dilution sampling and mounting structure thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121616691.XU CN215894315U (en) | 2021-07-16 | 2021-07-16 | NOx rapid measurement instrument based on dilution sampling and mounting structure thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215894315U true CN215894315U (en) | 2022-02-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121616691.XU Active CN215894315U (en) | 2021-07-16 | 2021-07-16 | NOx rapid measurement instrument based on dilution sampling and mounting structure thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215894315U (en) |
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2021
- 2021-07-16 CN CN202121616691.XU patent/CN215894315U/en active Active
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