CN112146942A - Device and method for simultaneous sampling and time-sharing rotation measurement of NOx in SCR (selective catalytic reduction) denitration system - Google Patents
Device and method for simultaneous sampling and time-sharing rotation measurement of NOx in SCR (selective catalytic reduction) denitration system Download PDFInfo
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- 238000005070 sampling Methods 0.000 title claims abstract description 178
- 238000005259 measurement Methods 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title abstract description 10
- 238000010531 catalytic reduction reaction Methods 0.000 title description 3
- 239000007789 gas Substances 0.000 claims abstract description 127
- 239000003546 flue gas Substances 0.000 claims abstract description 57
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 56
- 238000004458 analytical method Methods 0.000 claims abstract description 15
- 238000009826 distribution Methods 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims description 4
- 230000000737 periodic effect Effects 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000011017 operating method Methods 0.000 claims 1
- 239000000779 smoke Substances 0.000 abstract description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 4
- 229910021529 ammonia Inorganic materials 0.000 abstract description 2
- 238000002347 injection Methods 0.000 abstract description 2
- 239000007924 injection Substances 0.000 abstract description 2
- 238000005192 partition Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009828 non-uniform distribution Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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- G—PHYSICS
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- 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
- G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
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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
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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
- G01N1/24—Suction devices
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- 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
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- 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—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0037—NOx
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Abstract
The invention discloses a device and a method for simultaneously sampling and time-sharing rotation measurement of NOx of a denitration system, which comprises a simultaneous sampling system, a sample gas storage system, a time-sharing rotation measurement system and a flue gas analyzer, wherein the simultaneous sampling system, the sample gas storage system, the time-sharing rotation measurement system and the flue gas analyzer are sequentially connected, a sampling pipe is used for simultaneously collecting flue gas samples at multiple measuring points at the cross section of a flue of the simultaneous sampling system, then the flue gas samples enter the sample gas storage system for storage, and finally the flue gas samples enter the flue gas analyzer for measurement and analysis through the time-sharing rotation measurement system, so that the simultaneous sampling and time-sharing rotation measurement of NOx of the denitration system at the. The method can monitor the distribution condition of the NOx concentration field of the same section in real time on line, realizes that the sampled smoke is the smoke at the same moment, and ensures that the measurement result effectively reflects the real distribution condition of the NOx concentration, thereby providing accurate data support for the accurate ammonia injection control of each partition.
Description
Technical Field
The invention relates to a device and a method for simultaneous sampling and time-sharing round measurement of NOx in an SCR denitration system.
Background
SCR denitration with denitration ultra-low emission implementationThe distribution uniformity of NOx at the inlet and the outlet of the system directly influences the performance of the SCR denitration system, and how to accurately master NO and NO in inlet and outlet flue gas2、N2O and O2And various indexes and real reflection of the distribution condition of NOx on the section of the flue become a great restriction factor for the ultralow emission and stable operation of the denitration system.
Currently NO, NO2、N2O and O2The detection and analysis of indexes mostly adopt a mode of extracting and sampling in a flue and then analyzing, while the existing flue sampling generally adopts a single-point sampling mode, and because the cross section of the flue is large, and the distribution of a flow field and a concentration field in the flue is uneven, the distribution condition of gas components on the whole cross section of the flue can not be effectively reflected by the single-point sampling mode, and the high-efficiency stable economical operation of ultralow emission is not facilitated.
The invention provides a device and a method for simultaneously sampling and time-sharing rotation measurement of NOx in a denitration system, which adopt a flue gas analyzer to time-share rotation measure NO and NO in different areas collected at the same time2、N2O and O2Therefore, the real NOx concentration field of the cross section of the flue at the same moment is obtained, the round measurement of the flue gas of each subarea is realized, and a group of data of the NOx concentration field at the same time can be obtained after each round of measurement. The technology can monitor the distribution condition of the NOx concentration field with the same section in real time on line, realizes that the sampled smoke is the smoke at the same moment, and ensures that the measurement result effectively reflects the real distribution condition of the NOx concentration, thereby providing accurate data support for the accurate ammonia injection control of each partition.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a device and a method for simultaneously sampling and time-sharing periodic measurement of NOx in an SCR denitration system, which can realize the simultaneous sampling and time-sharing periodic measurement on-line analysis of NOx concentration at the inlet and outlet sections of the SCR denitration system while truly reflecting the distribution state of the NOx concentration.
The technical scheme adopted by the invention for solving the problems is as follows: a device for simultaneously sampling and time-sharing rotation measurement of NOx of an SCR (selective catalytic reduction) denitration system is characterized by comprising a simultaneous sampling system, a sample gas storage system, a time-sharing rotation measurement system and a flue gas analyzer, wherein the simultaneous sampling system, the sample gas storage system, the time-sharing rotation measurement system and the flue gas analyzer are sequentially connected, a sampling pipe is used for simultaneously collecting flue gas samples at multiple measuring points at the cross section of a flue of the simultaneous sampling system, then the flue gas samples enter the sample gas storage system for storage, and finally the flue gas samples enter the flue gas analyzer for measurement and analysis through the time-sharing rotation measurement system, so that the simultaneous sampling and time-sharing rotation measurement of NOx at the same cross;
the simultaneous sampling system comprises a sampling pipe, a smoke filter and a sampling one-way electromagnetic valve, the sampling pipe, the smoke filter and the sampling one-way electromagnetic valve are sequentially connected, the sampling one-way electromagnetic valve is connected with the sample gas storage system, and sampled smoke enters the sampling pipe, then is subjected to dust and water gas filtration through the smoke filter, and then enters the sample gas storage system through the sampling one-way electromagnetic valve;
the sample gas storage system comprises a sample gas storage tank, a sampling air pump, a sample gas emptying device and a sampling three-way electromagnetic valve, wherein the sample gas storage tank, the sampling air pump and the sampling three-way electromagnetic valve are sequentially connected, the sample gas storage tank is connected with a sampling one-way electromagnetic valve, the sample gas emptying device and the time-sharing wheel measurement system are both connected with the sampling three-way electromagnetic valve, the sampling sample gas is extracted by the sampling air pump and enters the sample gas storage tank, and the sample gas in the sample gas storage tank can enter the time-sharing wheel measurement system or the sample gas emptying device through the sampling three-way electromagnetic valve;
the time-sharing wheel measuring system comprises a sample gas emptying pump, a measuring three-way electromagnetic valve and a sample gas emptying device, wherein the sampling three-way electromagnetic valve, the sample gas emptying pump and the flue gas analyzer are all connected with the measuring three-way electromagnetic valve, the sample gas emptying device is connected with the sample gas emptying pump, and sample gas can enter the flue gas analyzer through the measuring three-way electromagnetic valve or enter the sample gas emptying device through the sample gas emptying pump.
Furthermore, the flue gas analyzer can realize NO and NO in flue gas components2、N2O and O2Real-time synchronous online sampling analysis.
Furthermore, the number N of the measuring points of the simultaneous sampling system is determined by the width L of the cross section of the flue, and the specific number N of the measuring points is an integer value from L/3 to L/2.
Furthermore, the sampling pipe can be a flute-shaped sampling pipe or a row of sampling pipes; the flute-shaped sampling pipe comprises a flute-shaped sampling main pipe, and a plurality of sampling flute-shaped holes are formed in the flute-shaped sampling main pipe; the row of sampling pipes comprise sampling branch pipes, sampling headers and a row of sampling main pipes, and the plurality of sampling branch pipes are connected with the row of sampling main pipes through the sampling headers; the number of the sampling flute-shaped holes and the sampling branch pipes is determined according to the depth D of the flue of the sampling measuring point, and the specific number is an integer value from D/3 to D/2.
Further, the volume of the sample gas storage tank is determined by the analysis time delta t of a single gas circuit sample of the flue gas analyzer and the flow v of the sampling air pump, and the volume of the sample gas storage tank is 2 x delta t-v to 3 x delta t-v.
The working method of the device for simultaneously sampling and time-sharing rotation measurement of NOx in the SCR denitration system is characterized by comprising the following steps of: sampling the sample gas at the N measuring points simultaneously by a simultaneous sampling system, allowing the sample gas to enter a sample gas storage tank of a sample gas storage system, sequentially performing round measurement on the sample gas in the sample gas storage tanks at the N measuring points by a flue gas analyzer through a sampling three-way electromagnetic valve, and after the detection of each measuring point is finished, emptying the sample gas in the pipeline by switching a measuring three-way electromagnetic valve; after the sample gas time-sharing wheel measurement of the N measuring points is finished, the sample gas in the sample gas storage tank is emptied through switching the sampling three-way electromagnetic valve; because the analysis time of a single gas path sample of the flue gas analyzer is delta t, and the time-sharing round measurement can be completed within the time of N ∙ delta t after the N measuring points on the same section are sampled simultaneously, the measuring result on the same section is ensured to be the sample gas at the same time, the flue gas distribution condition on the same section can be accurately mastered, and the influence of load and time change on the measuring result is avoided.
Compared with the prior art, the invention has the following advantages and effects:
1) meanwhile, the distribution condition of NOx at the section of the flue at the same time can be truly reflected by sampling;
2) the time-sharing round measurement can effectively reduce the cost of the smoke gas analysis instrument during multi-point measurement;
3) the distribution of NOx in the denitration system can be reflected in real time by sampling and time-sharing test at the same time, so that the measurement accuracy is effectively improved;
4) the process route of the invention ensures the uniform distribution of NOx at the inlet and outlet sections of the denitration system and reduces the influence caused by the nonuniform distribution.
Drawings
FIG. 1 is a schematic view of the overall structure of the apparatus of the present invention.
FIG. 2 is a schematic diagram of the arrangement of the measuring points of the simultaneous sampling system of the present invention.
FIG. 3 is a schematic view of the structure of the sampling tube of the present invention.
In the figure: meanwhile, the sampling system comprises a sampling system 1, a sample gas storage system 2, a time-sharing wheel measurement system 3, a smoke analyzer 4, a sampling pipe 5, a smoke filter 6, a sampling one-way electromagnetic valve 7, a sample gas storage tank 8, a sampling air pump 9, a sample gas emptying device 10, a sampling three-way electromagnetic valve 11, a sample gas emptying pump 12, a measurement three-way electromagnetic valve 13, a flute-shaped sampling main pipe 14, a sampling flute-shaped hole 15, a sampling branch pipe 16, a sampling header 17 and a row sampling main pipe 18.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
As shown in fig. 1, a device for simultaneous sampling and time-sharing round measurement of NOx in an SCR denitration system includes a simultaneous sampling system 1, a sample gas storage system 2, a time-sharing round measurement system 3, and a flue gas analyzer 4, where the simultaneous sampling system 1, the sample gas storage system 2, the time-sharing round measurement system 3, and the flue gas analyzer 4 are sequentially connected, and at the same time, the sampling system 1 collects flue gas samples at multiple measuring points at the cross section of a flue at the same time by a sampling pipe 5, and then enters the sample gas storage system 2 for storage, and finally enters the flue gas analyzer 4 for measurement and analysis by the time-sharing round measurement system 3, thereby realizing simultaneous sampling and time-sharing round measurement of NOx in the same cross section of;
meanwhile, the sampling system 1 comprises a sampling pipe 5, a flue gas filter 6 and a sampling one-way electromagnetic valve 7, the sampling pipe 5, the flue gas filter 6 and the sampling one-way electromagnetic valve 7 are sequentially connected, the sampling one-way electromagnetic valve 7 is connected with the sample gas storage system 2, the sampled flue gas firstly passes through the flue gas filter 6 to be filtered by dust and water vapor after entering the sampling pipe 5, and then enters the sample gas storage system 2 through the sampling one-way electromagnetic valve 7;
the sample gas storage system 2 comprises a sample gas storage tank 8, a sampling air pump 9, a sample gas emptying device 10 and a sampling three-way electromagnetic valve 11, the sample gas storage tank 8, the sampling air pump 9 and the sampling three-way electromagnetic valve 11 are sequentially connected, the sample gas storage tank 8 is connected with a sampling one-way electromagnetic valve 7, the sample gas emptying device 10 and the time-sharing wheel measurement system 3 are both connected with the sampling three-way electromagnetic valve 11, the sampling sample gas is extracted by the sampling air pump 9 and enters the sample gas storage tank 8, and the sample gas in the sample gas storage tank 8 can enter the time-sharing wheel measurement system 3 or the sample gas emptying device 10 through the sampling three-way electromagnetic valve;
the time-sharing wheel measurement system 3 comprises a sample gas evacuation pump 12, a measurement three-way electromagnetic valve 13 and a sample gas evacuation device 10, wherein the sampling three-way electromagnetic valve 11, the sample gas evacuation pump 12 and the flue gas analyzer 4 are all connected with the measurement three-way electromagnetic valve 13, the sample gas evacuation device 10 is connected with the sample gas evacuation pump 12, and sample gas can enter the flue gas analyzer 4 through the measurement three-way electromagnetic valve 13 or enter the sample gas evacuation device 10 through the sample gas evacuation pump 12.
Specifically, the flue gas analyzer 4 can realize NO and NO in flue gas components2、N2O and O2Real-time synchronous online sampling analysis.
As shown in FIG. 2, the number N of the measuring points of the simultaneous sampling system 1 is determined by the width L of the cross section of the flue, and the specific number N of the measuring points is an integer value from L/3 to L/2.
As shown in fig. 3, the sampling tube 5 may be a flute-shaped sampling tube or a row of sampling tubes; the flute-shaped sampling pipe comprises a flute-shaped sampling main pipe 14, and a plurality of sampling flute-shaped holes 15 are formed in the flute-shaped sampling main pipe 14; the row of sampling pipes comprises sampling branch pipes 16, a sampling header 17 and a row of sampling main pipes 18, and the plurality of sampling branch pipes 16 are connected with the row of sampling main pipes 18 through the sampling header 17; the number of the sampling flute-shaped holes 15 and the sampling branch pipes 16 is determined according to the depth D of the flue at the sampling measuring point, and the specific number is an integral value from D/3 to D/2.
Specifically, the volume of the sample gas storage tank 8 is determined by the single gas path sample analysis time Δ t of the flue gas analyzer 4 and the flow v of the sampling air pump 9, and the volume of the sample gas storage tank 8 is 2 × Δ t · v to 3 × Δ t · v.
The working method comprises the following steps: the sample gas at the N measuring points is sampled simultaneously by the simultaneous sampling system 1, the sample gas enters a sample gas storage tank 8 of the sample gas storage system 2, then the sample gas in the sample gas storage tank 8 at the N measuring points is sequentially subjected to round measurement by the flue gas analyzer 4 through a sampling three-way electromagnetic valve 11, and after the detection of each measuring point is finished, the sample gas in the pipeline is emptied through a switching measurement three-way electromagnetic valve 13; after the sample gas time-sharing wheel measurement of the N measuring points is finished, the sample gas in the sample gas storage tank 8 is emptied through the switching sampling three-way electromagnetic valve 11; because the analysis time of a single gas path sample of the flue gas analyzer 4 is delta t, after N measuring points on the same section are sampled simultaneously, time-sharing round measurement can be completed within the time of N ∙ delta t, so that the measuring result of the same section is ensured to be the sample gas at the same time, the flue gas distribution condition at the same section can be accurately mastered, and the influence of load and time change on the measuring result is avoided.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (6)
1. A device for simultaneously sampling NOx of an SCR denitration system and carrying out time-sharing rotation is characterized by comprising a simultaneous sampling system (1), a sample gas storage system (2), a time-sharing rotation measurement system (3) and a flue gas analyzer (4), wherein the simultaneous sampling system (1), the sample gas storage system (2), the time-sharing rotation measurement system (3) and the flue gas analyzer (4) are sequentially connected, a sampling pipe (5) is used for simultaneously collecting flue gas samples at multiple measuring points at the cross section of a flue of the simultaneous sampling system (1), then the flue gas samples enter the sample gas storage system (2) for storage, and finally the flue gas samples enter the flue gas analyzer (4) through the time-sharing rotation measurement system (3) for measurement and analysis, so that the NOx of the denitration system is simultaneously sampled at the same cross section and carried out time-sharing rotation;
the simultaneous sampling system (1) comprises a sampling pipe (5), a flue gas filter (6) and a sampling one-way electromagnetic valve (7), wherein the sampling pipe (5), the flue gas filter (6) and the sampling one-way electromagnetic valve (7) are sequentially connected, the sampling one-way electromagnetic valve (7) is connected with the sample gas storage system (2), and sampled flue gas enters the sampling pipe (5), is firstly filtered by dust and water gas through the flue gas filter (6), and then enters the sample gas storage system (2) through the sampling one-way electromagnetic valve (7);
the sample gas storage system (2) comprises a sample gas storage tank (8), a sampling air pump (9), a sample gas emptying device (10) and a sampling three-way electromagnetic valve (11), wherein the sample gas storage tank (8), the sampling air pump (9) and the sampling three-way electromagnetic valve (11) are sequentially connected, the sample gas storage tank (8) is connected with a sampling one-way electromagnetic valve (7), the sample gas emptying device (10) and the time-sharing wheel measurement system (3) are both connected with the sampling three-way electromagnetic valve (11), the sampling sample gas is extracted by the sampling air pump (9) to enter the sample gas storage tank (8), and the sample gas in the sample gas storage tank (8) can enter the time-sharing wheel measurement system (3) or the sample gas emptying device (10) through the sampling three-way electromagnetic valve (11);
the time-sharing wheel measurement system (3) comprises a sample gas evacuation pump (12), a measurement three-way electromagnetic valve (13) and a sample gas evacuation device (10), wherein the sampling three-way electromagnetic valve (11), the sample gas evacuation pump (12) and a flue gas analyzer (4) are all connected with the measurement three-way electromagnetic valve (13), the sample gas evacuation device (10) is connected with the sample gas evacuation pump (12), and sample gas can enter the flue gas analyzer (4) or enter the sample gas evacuation device (10) through the sample gas evacuation pump (12) through the measurement three-way electromagnetic valve (13).
2. The device for simultaneous sampling and time-sharing periodic measurement of NOx in the SCR denitration system according to claim 1, wherein the flue gas analyzer (4) can realize NO and NO in flue gas components2、N2O and O2Real-time synchronous online sampling analysis.
3. The device for the simultaneous sampling and time-sharing round measurement of NOx in the SCR denitration system according to claim 1, wherein the number N of the measuring points of the simultaneous sampling system (1) is determined by the width L of the section of the flue, and the specific number N of the measuring points is an integral value from L/3 to L/2.
4. The device for simultaneously sampling and time-sharing periodic measurement of NOx in the SCR denitration system according to claim 1, wherein the sampling pipes (5) can be flute-shaped sampling pipes or parallel-arranged sampling pipes; the flute-shaped sampling pipe comprises a flute-shaped sampling main pipe (14), and a plurality of sampling flute-shaped holes (15) are formed in the flute-shaped sampling main pipe (14); the row of sampling pipes comprises sampling branch pipes (16), a sampling header (17) and a row of sampling main pipe (18), and the plurality of sampling branch pipes (16) are connected with the row of sampling main pipe (18) through the sampling header (17); the number of the sampling flute-shaped holes (15) and the sampling branch pipes (16) is determined according to the depth D of the flue at the sampling measuring point, and the specific number is an integer value from D/3 to D/2.
5. The device for simultaneous sampling and time-sharing measurement of NOx in an SCR denitration system according to claim 1, wherein the volume of the sample gas storage tank (8) is determined by the single gas path sample analysis time Δ t of the flue gas analyzer (4) and the flow v of the sampling suction pump (9), and the volume of the sample gas storage tank (8) is 2 × Δ t · v to 3 × Δ t · v.
6. An operating method of the device for simultaneously sampling and time-sharing rotation measurement of NOx in the SCR denitration system as claimed in any one of claims 1 to 5, characterized by comprising the following steps: sample gas at the N measuring points is sampled simultaneously by the simultaneous sampling system (1), the sample gas enters a sample gas storage tank (8) of the sample gas storage system (2), then the sample gas in the sample gas storage tank (8) at the N measuring points is sequentially subjected to round measurement by the flue gas analyzer (4) through a sampling three-way electromagnetic valve (11), and after the detection of each measuring point is finished, the sample gas in the pipeline is emptied by switching a measuring three-way electromagnetic valve (13); after the sample gas time-sharing wheel measurement of the N measuring points is finished, the sample gas in the sample gas storage tank (8) is emptied through the switching sampling three-way electromagnetic valve (11); because the analysis time of a single gas path sample of the flue gas analyzer (4) is delta t, after N measuring points on the same section are sampled simultaneously, time-sharing round measurement can be completed within the time of N ∙ delta t, so that the measuring result of the same section is ensured to be the sample gas at the same time, the flue gas distribution condition at the same section can be accurately mastered, and the influence of load and time change on the measuring result is avoided.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113960255A (en) * | 2021-10-21 | 2022-01-21 | 江苏嘉臣环境科技有限公司 | Multi-point ambient air monitoring method and system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204479546U (en) * | 2014-12-26 | 2015-07-15 | 浙江浙能技术研究院有限公司 | Based on grid arrange method without sampling pump flue gas concentration measuring system |
| CN205720154U (en) * | 2016-04-28 | 2016-11-23 | 华能平凉发电有限责任公司 | A kind of flue gas inspection equipment and denitrating system |
| CN107607370A (en) * | 2017-09-22 | 2018-01-19 | 华电电力科学研究院 | Flue cross section matrix form real-time synchronization on-line sampling analytical equipment and its method for sampling |
| CN206990539U (en) * | 2017-06-27 | 2018-02-09 | 郑州天之润能源科技有限公司 | A kind of intelligent managing and control system based on thermal power plant's denitration floor data monitoring |
| CN108254581A (en) * | 2018-01-15 | 2018-07-06 | 西安热工研究院有限公司 | A kind of gaseous pollutant multiple spot automatic sampling tests system |
-
2020
- 2020-08-11 CN CN202010799814.1A patent/CN112146942A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204479546U (en) * | 2014-12-26 | 2015-07-15 | 浙江浙能技术研究院有限公司 | Based on grid arrange method without sampling pump flue gas concentration measuring system |
| CN205720154U (en) * | 2016-04-28 | 2016-11-23 | 华能平凉发电有限责任公司 | A kind of flue gas inspection equipment and denitrating system |
| CN206990539U (en) * | 2017-06-27 | 2018-02-09 | 郑州天之润能源科技有限公司 | A kind of intelligent managing and control system based on thermal power plant's denitration floor data monitoring |
| CN107607370A (en) * | 2017-09-22 | 2018-01-19 | 华电电力科学研究院 | Flue cross section matrix form real-time synchronization on-line sampling analytical equipment and its method for sampling |
| CN108254581A (en) * | 2018-01-15 | 2018-07-06 | 西安热工研究院有限公司 | A kind of gaseous pollutant multiple spot automatic sampling tests system |
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