CN113916612A - High-efficient automatically cleaning multiple spot flue gas wheel survey system - Google Patents
High-efficient automatically cleaning multiple spot flue gas wheel survey system Download PDFInfo
- Publication number
- CN113916612A CN113916612A CN202111171534.7A CN202111171534A CN113916612A CN 113916612 A CN113916612 A CN 113916612A CN 202111171534 A CN202111171534 A CN 202111171534A CN 113916612 A CN113916612 A CN 113916612A
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- Prior art keywords
- sampling
- flushing
- branch pipe
- electromagnetic valve
- flue gas
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 239000003546 flue gas Substances 0.000 title claims abstract description 34
- 238000004140 cleaning Methods 0.000 title claims abstract description 14
- 238000005070 sampling Methods 0.000 claims abstract description 114
- 238000011010 flushing procedure Methods 0.000 claims abstract description 40
- 238000012360 testing method Methods 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 230000000712 assembly Effects 0.000 claims abstract description 11
- 238000000429 assembly Methods 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 239000000779 smoke Substances 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000000428 dust Substances 0.000 description 4
- 238000005406 washing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000011086 high cleaning Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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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
- G01N1/2247—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
- 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
- G01N33/0016—Sample conditioning by regulating a physical variable, e.g. pressure or temperature
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses an efficient self-cleaning multipoint flue gas wheel-measuring system which comprises a high-pressure water tank, a switching control box, a flue gas analyzer and a plurality of groups of flushing sampling assemblies, wherein the high-pressure water tank is connected with the switching control box; each group of flushing sampling assemblies comprises a sampling connecting pipe, a flushing connecting pipe, a sampling electromagnetic valve, a flushing electromagnetic valve and a sampling branch pipe; the sampling branch pipe is inserted into the denitration flue, and the rear end of the sampling branch pipe is of a Y-shaped structure; one branch part of the sampling branch pipe is connected with the high-pressure water tank through a flushing connecting pipe, and the other branch part of the sampling branch pipe is connected with the switching control box through a sampling connecting pipe; a branch part of the sampling branch pipe, which is connected with the high-pressure water tank, is provided with a flushing electromagnetic valve and a pressure sensor, and the other branch part is provided with a sampling electromagnetic valve; the pressure sensor, the sampling electromagnetic valve and the flushing electromagnetic valve are all electrically connected with a control system of the switching control box; the switching control box is connected with the flue gas analyzer. The system can realize automatic round-robin detection, can perform blockage detection and automatic flushing on the sampling branch pipe, reduces labor intensity and improves testing efficiency.
Description
Technical Field
The invention relates to the technical field of flue gas collection and testing of coal-fired boilers, in particular to a high-efficiency self-cleaning multipoint flue gas alternate testing system.
Background
In the power industry, coal-fired power generation generates and discharges a large amount of NOx gas, so that it is necessary to test the uniformity of NOx concentration distribution in a flue. During testing, the sampling tubes are manually inserted into the performance test holes, and a plurality of holes are formed; during testing, equipment such as a flue gas analyzer is usually required to be carried, the flue gas analyzer is connected with the sampling tube and analyzes the flue gas, and therefore the content of components in the flue gas is obtained.
At present, the sampling tube is pulled out of the last measuring hole during each test, and then the sampling tube is inserted into the next measuring hole to perform round measurement one by one. The number of test holes is large during testing, so that the labor intensity is high, and the detection efficiency is low; in addition, the flue gas in the flue contains a large amount of dust, and when the flue gas is sampled for a long time, the dust can be attached to the flue gas sampling tube, so that the sampling performance is reduced and even the sampling performance is invalid. In practical application, the air purging mode has a certain cleaning effect on floating dust in the sampling pipe, but particulate matters accumulated for a long time are easy to adhere to the inner surface of the sampling pipe in a high-temperature environment of a flue and are difficult to purge, and the sampling pipe can still be blocked for a long time; in order not to influence the testing work, the staff must pull down the sampling tube and pass through the mode of power strike + air blowback, or pour into the water washing and just can clean up the sampling tube, this has increased intensity of labour undoubtedly to detection efficiency has been reduced.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide an efficient self-cleaning multipoint flue gas rotation testing system, which can realize automatic rotation testing corresponding to each testing hole, can automatically detect whether a sampling branch pipe is blocked or not, and can automatically flush the sampling branch pipe, thereby greatly reducing the labor intensity and improving the testing efficiency.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
a high-efficiency self-cleaning multipoint flue gas wheel-measuring system comprises a high-pressure water tank, a switching control box, a flue gas analyzer and a plurality of groups of flushing sampling assemblies; each group of flushing sampling assemblies comprises a sampling connecting pipe, a flushing connecting pipe, a sampling electromagnetic valve, a flushing electromagnetic valve and a sampling branch pipe; the sampling branch pipe is inserted into the denitration flue through the test detection hole; the rear end of the sampling branch pipe is of a Y-shaped structure with two branching parts, one branching part of the sampling branch pipe is connected with the high-pressure water tank through a flushing connecting pipe, and the other branching part of the sampling branch pipe is connected with the switching control box through a sampling connecting pipe; a branch part of the sampling branch pipe, which is connected with the high-pressure water tank, is provided with a flushing electromagnetic valve and is connected with a pressure sensor; a fork part of the sampling branch pipe connected with the switching control box is provided with a sampling electromagnetic valve; the pressure sensor, the sampling electromagnetic valve and the flushing electromagnetic valve are all electrically connected with a control system in the switching control box; the switching control box is connected with the smoke analyzer.
Furthermore, the sampling branch pipe is a round steel pipe, and the inner diameter of the front part of the sampling branch pipe is 8-12 mm.
Furthermore, an air pump connected with the sampling connecting pipe is arranged in the switching control box.
Further, when the pressure sensor detects that the pressure value in the sampling branch pipe reaches-5 KPa, the control system in the switching control box closes the sampling electromagnetic valve and opens the flushing electromagnetic valve.
Further, the flushing time of the high-pressure water tank is 10 s.
Further, the number of the flushing sampling assemblies is three.
The invention has the beneficial effects that:
when the system is used for sampling, analyzing and testing smoke, the switching control box controls the sampling electromagnetic valves to be opened one by one, smoke sequentially passes through the sampling branch pipe, the sampling electromagnetic valve and the sampling connecting pipe to enter the switching control box and then enters the smoke analyzer for smoke component content analysis; when a certain sampling branch pipe is blocked, strong negative pressure can be generated in the sampling branch pipe, the pressure sensor detects the strong negative pressure, a signal is transmitted to a control system in the switching control box, the control system stops sampling, a corresponding sampling electromagnetic valve is closed, and a flushing electromagnetic valve is opened; the high-pressure water in the high-pressure water tank washes the sampling branch pipe.
The system has high automation degree, does not need manual interference in the whole process, can realize automatic round measurement corresponding to each measuring hole, can automatically detect whether the sampling branch pipe is blocked or not, and automatically washes the sampling branch pipe, has high cleaning degree, greatly reduces the labor intensity, and improves the testing efficiency.
Drawings
Fig. 1 is a schematic structural diagram of a smoke dust collecting system with an anti-blocking device.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
FIG. 1 shows a preferred embodiment of an efficient self-cleaning multi-point flue gas rotational measurement system; the system comprises a high-pressure water tank 1, a switching control box 2, a flue gas analyzer 3 and a plurality of groups of flushing sampling assemblies; this embodiment has three sets of flush sampling assemblies corresponding to the number of test holes on the denitration flue; each group of flushing sampling assemblies comprises a sampling connecting pipe 4, a flushing connecting pipe 5, a sampling electromagnetic valve 6, a flushing electromagnetic valve 7 and a sampling branch pipe 8; the sampling branch pipe 8 is inserted into the denitration flue 11 through a test hole 10; the rear end of the sampling branch pipe 8 is of a Y-shaped structure with two bifurcate parts, one bifurcate part of the sampling branch pipe 8 is connected with the high-pressure water tank 1 through a flushing connecting pipe 5, and the other bifurcate part of the sampling branch pipe 8 is connected with the switching control box 2 through a sampling connecting pipe 4; a branch part of the sampling branch pipe 8 connected with the high-pressure water tank 1 is provided with a flushing electromagnetic valve 7 and is connected with a pressure sensor 9; a sampling electromagnetic valve 6 is arranged on a fork part of the sampling branch pipe 8 connected with the switching control box 2; the pressure sensor 9, the sampling electromagnetic valve 6 and the flushing electromagnetic valve 7 are all electrically connected with a control system in the switching control box 2; the switching control box 2 is connected with the smoke analyzer 3.
In this embodiment, the sampling branch pipe 8 is a circular steel pipe having an inner diameter of 8mm to 12mm at the front portion thereof.
An air pump is arranged in the switching control box 2 and is connected with a sampling connecting pipe 4, and the outlet of the air pump is connected with a flue gas analyzer 3 through a pipeline; during sampling, the air pump pumps the flue gas into the sampling connecting pipe 4, and finally the flue gas enters the flue gas analyzer 3.
When the smoke sampling analysis test is carried out, each sampling branch pipe 8 is inserted into the corresponding test hole 10, and all the flushing electromagnetic valves 7 are closed at the moment; the switching control box 2 controls the sampling electromagnetic valves 6 to be opened one by one; under the action of an air pump, flue gas in a denitration flue 11 sequentially passes through a sampling branch pipe 8, a sampling electromagnetic valve 6 and a sampling connecting pipe 4 to enter a switching control box 2 and then enters a flue gas analyzer 3 for flue gas component content analysis; when a certain sampling branch pipe 8 is blocked, under the pumping action of the air pump, strong negative pressure can be generated in the sampling branch pipe 8, and the pressure sensor 9 detects the strong negative pressure and transmits a signal to a control system in the switching control box 2; when the pressure value in the sampling branch pipe 8 reaches-5 KPa, the control system in the switching control box 2 stops sampling, the sampling electromagnetic valve 6 is closed, and the flushing electromagnetic valve 7 is opened; high-pressure water in the high-pressure water tank 1 enters the sampling branch pipe 8 through the flushing connecting pipe 5 to flush the sampling branch pipe 8; the flushing time of the high-pressure water tank 1 is 10 s; after the washing is finished, the washing electromagnetic valve 7 is closed, the sampling electromagnetic valve 6 is opened, and the flue gas sampling analysis is further started.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. The utility model provides a system is surveyed in turn to high-efficient automatically cleaning multiple spot flue gas which characterized in that: comprises a high-pressure water tank, a switching control box, a flue gas analyzer and a plurality of groups of flushing sampling assemblies; each group of flushing sampling assemblies comprises a sampling connecting pipe, a flushing connecting pipe, a sampling electromagnetic valve, a flushing electromagnetic valve and a sampling branch pipe; the sampling branch pipe is inserted into the denitration flue through the test detection hole; the rear end of the sampling branch pipe is of a Y-shaped structure with two branching parts, one branching part of the sampling branch pipe is connected with the high-pressure water tank through a flushing connecting pipe, and the other branching part of the sampling branch pipe is connected with the switching control box through a sampling connecting pipe; a branch part of the sampling branch pipe, which is connected with the high-pressure water tank, is provided with a flushing electromagnetic valve and is connected with a pressure sensor; a fork part of the sampling branch pipe connected with the switching control box is provided with a sampling electromagnetic valve; the pressure sensor, the sampling electromagnetic valve and the flushing electromagnetic valve are all electrically connected with a control system in the switching control box; the switching control box is connected with the smoke analyzer.
2. The efficient self-cleaning multipoint flue gas rotational measurement system of claim 1, wherein: the sampling branch pipe is a round steel pipe, and the inner diameter of the front part of the sampling branch pipe is 8-12 mm.
3. The efficient self-cleaning multipoint flue gas rotational measurement system of claim 1, wherein: and an air pump connected with the sampling connecting pipe is arranged in the switching control box.
4. The efficient self-cleaning multipoint flue gas rotational measurement system of claim 1, wherein: when the pressure sensor detects that the pressure value in the sampling branch pipe reaches-5 KPa, the control system in the switching control box closes the sampling electromagnetic valve and opens the flushing electromagnetic valve.
5. The efficient self-cleaning multipoint flue gas rotational measurement system of claim 1, wherein: the flushing time of the high-pressure water tank is 10 s.
6. The efficient self-cleaning multipoint flue gas rotational measurement system of claim 1, wherein: the number of the flushing sampling assemblies is three.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111171534.7A CN113916612A (en) | 2021-10-08 | 2021-10-08 | High-efficient automatically cleaning multiple spot flue gas wheel survey system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111171534.7A CN113916612A (en) | 2021-10-08 | 2021-10-08 | High-efficient automatically cleaning multiple spot flue gas wheel survey system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113916612A true CN113916612A (en) | 2022-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111171534.7A Pending CN113916612A (en) | 2021-10-08 | 2021-10-08 | High-efficient automatically cleaning multiple spot flue gas wheel survey system |
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| Country | Link |
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| CN (1) | CN113916612A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114608901A (en) * | 2022-05-10 | 2022-06-10 | 南通东昌环保设备科技有限公司 | Automatically cleaning dust sample thief |
-
2021
- 2021-10-08 CN CN202111171534.7A patent/CN113916612A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114608901A (en) * | 2022-05-10 | 2022-06-10 | 南通东昌环保设备科技有限公司 | Automatically cleaning dust sample thief |
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