CN110132663B - Flue gas sampling auxiliary device suitable for high Wen Zhengya flue - Google Patents
Flue gas sampling auxiliary device suitable for high Wen Zhengya flue Download PDFInfo
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- CN110132663B CN110132663B CN201910356235.7A CN201910356235A CN110132663B CN 110132663 B CN110132663 B CN 110132663B CN 201910356235 A CN201910356235 A CN 201910356235A CN 110132663 B CN110132663 B CN 110132663B
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- 238000005070 sampling Methods 0.000 title claims abstract description 109
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 239000003546 flue gas Substances 0.000 title claims abstract description 53
- 239000000779 smoke Substances 0.000 claims abstract description 44
- 238000002347 injection Methods 0.000 claims description 26
- 239000007924 injection Substances 0.000 claims description 26
- 238000010926 purge Methods 0.000 claims description 19
- 239000007789 gas Substances 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 206010022000 influenza Diseases 0.000 claims description 2
- 208000027418 Wounds and injury Diseases 0.000 abstract description 3
- 230000006378 damage Effects 0.000 abstract description 3
- 208000014674 injury Diseases 0.000 abstract description 3
- 239000002341 toxic gas Substances 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 231100000075 skin burn Toxicity 0.000 description 1
- 239000000243 solution Substances 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
- G01N1/24—Suction devices
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a smoke sampling auxiliary device suitable for a high Wen Zhengya flue. The existing flue gas sampling hole cannot be suitable for a flue gas sampling place with a height of Wen Zhengya. The sampling tube, the first connecting piece and the front external tube are connected to a coaxial tube section perpendicular to the wall surface of the flue, and are used as flue gas sampling holes; the air flowing into one end of the sampling tube forms a seal for the smoke flowing into the other end of the sampling tube, and the air in the environment enters from the smoke sampling hole from which the plug is detached, and turns to enter the mixing tube after passing through the second ball valve; simultaneously, the flue gas enters the front outer connecting pipe from the flue, and turns to enter the mixing pipe after passing through the first connecting piece and the sampling pipe; the air and the flue gas are sucked into the ejector through the mixing pipe, then pass through the second connecting piece and the rear external connecting pipe together with the compressed air, and finally are sprayed into the flue. The invention can prevent the high-temperature flue gas from leaking to cause high-temperature burn or toxic gas injury; conditions for on-line flue gas sampling can be provided without restarting and stopping.
Description
Technical Field
The invention belongs to the technical field of gas sampling, and particularly relates to an auxiliary device for sampling high Wen Zhengya smoke.
Background
The flue gas generated by the combustion of the fuel flows in the flue and the chimney, and the pressure of the flue gas in all or part of the pipe sections can be positive pressure. When the flue gas sampling is carried out on a positive pressure flue or a chimney, the flue gas is easy to leak, especially the high-temperature flue gas leaks, the potential safety hazard is higher, and safety production accidents such as personnel poisoning, skin burn, surrounding combustible material ignition and the like are easy to cause. The flue gas sampling hole generally comprises an external pipe section and a plug (such as a threaded blank cap, a flange plate, a plug and the like), the plug is opened during flue gas sampling, and the plug is reinstalled during flue gas sampling. However, in a high Wen Zhengya flue or chimney place, the plugging of the flue gas sampling hole is opened to enable high-temperature flue gas to leak, so that personnel and environmental safety are affected, and the flue gas sampling cannot be normally performed.
The existing solution is that before smoke sampling, the machine is stopped, the plugging is opened, the smoke sampling device is installed, the protective mask and the anti-scalding glove are worn during smoke sampling, the gap between the sampling hole and the sampling device is sealed by gauze, the machine is stopped and reinstalled when the smoke sampling is completed, and the machine is restarted after the test is finished. It can be seen that the existing flue gas sampling hole cannot be suitable for the flue gas sampling place with the height Wen Zhengya, if the flue gas sampling hole is in an online operation process, the danger is high, and if the flue gas sampling hole is in an offline operation process, a start-stop unit is required.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a smoke sampling auxiliary device suitable for a high Wen Zhengya flue so as to prevent high-temperature burning or toxic gas injury caused by leakage of high-temperature smoke; to provide conditions for online flue gas sampling without restarting and shutdown.
Therefore, the invention adopts the following technical scheme: the utility model provides a flue gas sampling auxiliary device suitable for high Wen Zhengya flue, includes preceding takeover, back takeover, ejector, sampling tube, mixing tube, working air supply, injection pipe, purge tube, emergent air supply, air seal pipe, first connecting piece and second connecting piece;
the front external connecting pipe and the rear external connecting pipe are used for being installed on the wall surface of the flue;
the sampling tube, the first connecting piece and the front external tube are connected to a coaxial tube section perpendicular to the wall surface of the flue and are used as flue gas sampling holes;
the inlet end of the ejector is connected with the injection pipe, the outlet end of the ejector is connected with the rear external pipe through a second connecting piece, and the throat part of the ejector is connected with the purging pipe;
the injection pipe is used for conveying compressed air from a working air source to the inlet end of the ejector;
the purging pipe is used for conveying compressed air from a working air source to the throat part of the ejector;
one end of the sampling tube is provided with a detachable plug, and the other end of the sampling tube is connected with the front external connection tube through a first connecting piece; the sampling tube is provided with a second ball valve, and is provided with a mixing tube connecting hole and an air seal tube connecting hole; the mixing pipe connecting hole is positioned in the middle of the sampling pipe, the air seal pipe connecting hole is positioned between the mixing pipe connecting hole and the detachable plug, and the second ball valve is positioned between the air seal pipe connecting hole and the detachable plug;
one end of the mixing tube is connected to the middle part of the sampling tube, the other end of the mixing tube is connected to the throat part of the ejector, and the middle section of the mixing tube is a flexible connecting piece, so that the mixing tube has certain elasticity in the length direction, the mounting position is convenient to adjust, and the mounting flexibility is improved;
the air seal pipe is used for conveying compressed air from an emergency air source or a working air source to the sampling pipe;
the air flowing into one end of the sampling tube forms a seal for the smoke flowing into the other end of the sampling tube, and the air in the environment enters from the smoke sampling hole from which the plug is detached, and turns to enter the mixing tube after passing through the second ball valve; simultaneously, the flue gas enters the front outer connecting pipe from the flue, and turns to enter the mixing pipe after passing through the first connecting piece and the sampling pipe; the air and the flue gas are sucked into the ejector through the mixing pipe, then pass through the second connecting piece and the rear external connecting pipe together with the compressed air, and finally are sprayed into the flue.
The invention generates a low pressure area at the throat of the injector, the low pressure area forms a pressure difference with positive pressure in the flue and external environment pressure, and the pressure difference is utilized to drive flue gas and air to flow in from two ends of the sampling tube in opposite directions respectively, and the air at one end of the sampling tube forms a seal for the flue gas at the other end of the sampling tube, so that the flue gas is prevented from leaking during the flue gas sampling.
Preferably, the front external connecting pipe is positioned at the upstream of the flue gas in the flue, and the first ball valve is arranged on the front external connecting pipe.
Preferably, the rear external connecting pipe is positioned at the downstream of the flue gas in the flue, and the rear external connecting pipe is provided with a first stop valve.
Preferably, the number of the smoke sampling holes is one or more.
Preferably, the air seal pipe is provided with a normally open stop valve and a quick-open electromagnetic valve.
Preferably, the quick-opening electromagnetic valve is quickly opened when a preset logic is met, compressed air is sprayed into the sampling tube, so that the sealing of the smoke is formed, and the sealing performance of the air to the smoke when the smoke pressure in the flue abnormally fluctuates is ensured.
Preferably, the injection pipe is provided with an injection regulating valve.
Preferably, the injection valve is manually adjusted or automatically adjusted according to preset control logic to ensure the sealing performance of air to flue gas when the pressure in the flue normally fluctuates.
Preferably, the purge pipe is provided with a purge valve.
Preferably, the first connecting piece and the second connecting piece are independent parts, and the front external connecting pipe and the sampling pipe with different pipe diameters or the rear external connecting pipe and the ejector with different pipe diameters can be connected by selecting proper connecting pieces, so that the universality of the smoke sampling auxiliary device is stronger; the first connecting piece is connected with the front external connecting pipe and the sampling pipe in a threaded manner, so that the tightness is good; the second connecting piece is connected with the rear external connection pipe and the ejector in a threaded manner, so that the tightness is good.
Preferably, the flue refers to a channel through which flue gas flows, and comprises a commonly referred flue and a chimney.
Preferably, when the flue gas contains dust and the flue gas in the flue flows upwards, the ash collecting tank can be arranged below the mixing pipe on the sampling pipe, so that accumulated ash and ash removal are conveniently collected.
More preferably, the preset control logic of the injection valve has multiple possibilities, and can be designed according to the actual application scene.
More preferably, the preset logic of the quick-opening electromagnetic valve has various possibilities, and can be designed according to practical application scenes.
The invention is suitable for flues and chimneys, and has the following beneficial effects especially for places with height Wen Zhengya:
1) Can prevent the high-temperature flue gas from leaking to cause high-temperature burn or toxic gas injury;
2) The condition of on-line smoke sampling can be provided, and restarting and stopping are not needed;
3) A plurality of sampling holes can be simultaneously arranged, so that different test requirements are met;
4) Flexible installation and strong interface universality.
Drawings
FIG. 1 is a schematic diagram of a smoke sampling auxiliary device according to the present invention;
FIG. 2 is a front view of a sampling tube according to the present invention;
FIG. 3 is a top view of a sampling tube of the present invention;
FIGS. 4-5 are schematic cross-sectional views of the air seal tube connection holes of FIGS. 2 and 3 (FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4);
FIG. 6 is a schematic cross-sectional view of an ejector according to the present invention;
FIG. 7 is a graph illustrating control of an injection valve of the present invention;
fig. 8 is a control graph of the quick-opening solenoid valve of the present invention.
In the figure, the front external connection pipe, the first connection piece, the 3-sampling pipe, the 4-mixing pipe, the 5-ejector, the 6-rear external connection pipe, the 7-injection pipe, the 8-air seal pipe, the 9-working air source, the 10-emergency air source, the first ball valve, the first stop valve, the 13-injection valve, the 14-purge valve, the 15-quick-opening electromagnetic valve, the normally open stop valve, the first external screw thread, the first 17-connection hole, the mixing pipe connection hole, the 19-air seal pipe connection hole, the second connection piece, the second 21-ball valve, the detachable plug, the 23-purge pipe, the 24-air seal hole, the 25-empty slot, the second external screw thread, the 27-purge pipe connection hole, the third external screw thread, the connection hole on the mixing pipe, the 30-throat and the second 31-stop valve are arranged at the front.
Detailed Description
The specific examples described in the following embodiments of the present invention are merely illustrative of the specific embodiments of the present invention and do not constitute a limitation on the scope of the invention.
The invention is further described below with reference to the drawings and detailed description.
Fig. 1 is a schematic structural diagram of a smoke sampling auxiliary device when the smoke sampling auxiliary device is applied, wherein the smoke sampling auxiliary device comprises a front external connection pipe 1, a rear external connection pipe 6, an ejector 5, a sampling pipe 3, a mixing pipe 4, a working air source 9, an ejector pipe 7, a purging pipe 23, an emergency air source 10, an air seal pipe 8, a first connecting piece 2 and a second connecting piece 20. The front external connection pipe 1 and the rear external connection pipe 6 are both arranged on the wall surface of the flue; the front extension pipe 1 is positioned at the upstream of the flue gas, and a first ball valve 11 is arranged on the front extension pipe 1. The rear outer connecting pipe 6 is positioned at the downstream of the flue gas, and a first stop valve 12 is arranged on the rear outer connecting pipe 6. The inlet end of the ejector 5 is connected with the injection pipe 7, the outlet end of the ejector 5 is connected with the rear external pipe 6 through the first connecting piece 2, and the throat part of the ejector is connected with the purging pipe 6. The injection pipe 7 is used for conveying compressed air from the working air source 9 to the inlet end of the ejector 5, and the injection pipe 7 is provided with an injection regulating valve 13 and a second stop valve 31. The purge pipe 6 is used for conveying compressed air from a working air source 9 to the throat part of the ejector 5, and the purge pipe 6 is provided with a purge valve 14. The sampling tube 3 is provided with a detachable plug 22 at one end and is connected with the front external connection tube 11 at the other end through a first connecting piece 2.
The sampling tube 3, the first connecting piece 2 and the front external connecting tube 1 form a coaxial tube section perpendicular to the wall surface of the flue and are used as flue gas sampling holes. And one end of the mixing tube 4 is connected to the middle part of the sampling tube 3, the other end of the mixing tube is connected to the throat 5 of the ejector, and the middle section of the mixing tube is a flexible connecting piece. The air seal pipe 8 is used for conveying compressed air from the emergency air source 10 or the working air source 9 to the sampling pipe 3, and a normally open stop valve 16 and a quick-open electromagnetic valve 15 are arranged on the air seal pipe 8.
FIG. 2 is a front view of the sampling tube, and FIG. 3 is a top view of the sampling tube. The sampling tube 3 adopts first external screw thread 17 with the one end that first connecting piece 2 is connected, can dismantle shutoff 22 adopts the flange, sets up mixing tube connecting hole 18 and air seal pipe connecting hole 19 on the sampling tube, installs second ball valve 21 on the sampling tube, mixing tube connecting hole 18 be located sampling tube 3 middle part, air seal pipe connecting hole 19 is located between mixing tube connecting hole 18 and the removable shutoff 22, second ball valve 21 is between air seal pipe connecting hole 19 and the removable shutoff 22.
Fig. 4-5 are partial sectional views of the gas seal tube connecting hole in fig. 2 and 3, wherein a gas seal tube connecting hole 19 is formed on the outer surface of the sampling tube 3, 8 gas seal small holes 24 uniformly distributed along the circumference are formed on the inner surface of the sampling tube 3, and the gas seal tube connecting hole 19 is communicated with all the gas seal small holes 24 through a universal empty groove 25; compressed air enters from the air seal pipe connecting hole 19, is distributed to 8 air seal small holes 24 through the empty groove 25, and forms sealing on smoke from the inner cavity of the air seal small Kong Penru sampling pipe.
Fig. 6 is a sectional view of the ejector 5, wherein the end of the ejector 5 connected with the second connecting piece 20 adopts a second external thread 26, the end connected with the injection pipe 7 adopts a third external thread 28, and a purging pipe connecting hole 27 and a mixing pipe upper connecting hole 29 are formed at a throat 30.
Fig. 7 is a control diagram of the injection valve 13, which can be determined experimentally, showing the opening of the injection valve 13 at different flue gas pressures. The pressure taking position of the flue gas pressure is positioned in the flue and at the upstream of the front outer connecting pipe 1, and an existing pressure measuring point on the flue can be adopted; and under different smoke pressures, the opening of the injection regulating valve 13 is regulated until no smoke leaks from the sampling tube 3, and the opening corresponding to the smoke pressure is recorded.
Fig. 8 is a control graph of the quick-opening solenoid valve 15, which can be determined through experiments, showing that the quick-opening solenoid valve is quickly opened when the opening of the injection valve 13 is excessively large, and sealing compressed air is injected into the sampling tube 3; the sudden fluctuation of the smoke pressure is prevented, and the risk of smoke leakage occurs due to insufficient adjustment allowance of the injection adjusting valve 13. In the present embodiment, the quick-opening solenoid valve 15 is set to: when the opening degree of the injection valve 13 reaches 80%, the quick-opening solenoid valve 15 is fully opened instantaneously.
The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this invention, and are intended to be within the scope of this invention.
Claims (10)
1. The flue gas sampling auxiliary device suitable for the high Wen Zhengya flue comprises a front external connection pipe (1), a rear external connection pipe (6), an ejector (5), a sampling pipe (3), a mixing pipe (4), a working gas source (9), a jet pipe (7), a purging pipe (23), an emergency gas source (10), a gas seal pipe (8), a first connecting piece (2) and a second connecting piece (20), and is characterized in that,
the front external connection pipe (1) and the rear external connection pipe (6) are arranged on the wall surface of the flue;
the sampling tube (3), the first connecting piece (2) and the front external connecting tube (1) form a coaxial tube section perpendicular to the wall surface of the flue and are used as flue gas sampling holes;
the inlet end of the ejector (5) is connected with the injection pipe (7), the outlet end of the ejector is connected with the rear external pipe (6) through the second connecting piece (20), and the throat part of the ejector is connected with the purging pipe (23);
the injection pipe (7) is used for conveying compressed air from the working air source (9) to the inlet end of the ejector (5);
the purging pipe (23) is used for conveying compressed air from the working air source (9) to the throat part of the ejector (5);
one end of the sampling tube (3) is provided with a detachable plug (22), and the other end of the sampling tube is connected with the front external connection tube (1) through a first connecting piece (2); a second ball valve (21) is arranged on the sampling tube (3), and a mixing tube connecting hole (18) and an air tube connecting hole (19) are formed in the sampling tube (3); the mixing pipe connecting hole (18) is positioned in the middle of the sampling pipe, the air seal pipe connecting hole (19) is positioned between the mixing pipe connecting hole (18) and the detachable plug (22), and the second ball valve (21) is positioned between the air seal pipe connecting hole (19) and the detachable plug (22);
one end of the mixing tube (4) is connected to the middle part of the sampling tube (3), the other end of the mixing tube is connected to the throat part of the ejector (5), and the middle section of the mixing tube is a flexible connecting piece;
the air seal pipe (8) is used for conveying compressed air from an emergency air source (10) or a working air source (9) to the sampling pipe (3);
the air flowing into one end of the sampling tube (3) forms a seal for the smoke flowing into the other end of the sampling tube, and the air in the environment enters from the smoke sampling hole from which the plug is detached, and enters the mixing tube (4) after passing through the second ball valve (21) in a turning way; simultaneously, the flue gas enters the front external pipe (1) from the flue, and turns to enter the mixing pipe (4) after passing through the first connecting piece (2) and the sampling pipe (3); the air and the flue gas are sucked into the ejector (5) through the mixing pipe (4), then pass through the second connecting piece (20) and the rear external connecting pipe (6) together with the compressed air, and finally are sprayed into the flue.
2. A smoke sampling auxiliary device suitable for a high Wen Zhengya flue according to claim 1, wherein the front external connection pipe (1) is positioned at the upstream of smoke in the flue, and the front external connection pipe (1) is provided with a first ball valve (11).
3. A smoke sampling auxiliary device suitable for a high Wen Zhengya flue according to claim 1, wherein the rear external connection pipe (6) is positioned at the smoke downstream in the flue, and the rear external connection pipe (6) is provided with a first stop valve (12).
4. A smoke sampling assistance device according to any one of claims 1 to 3 adapted for use in a high Wen Zhengya flue, wherein said smoke sampling aperture is one or more.
5. A smoke sampling auxiliary device suitable for a high Wen Zhengya flue according to any one of claims 1-3, wherein the gas seal tube (8) is provided with a normally open stop valve (16) and a quick-open electromagnetic valve (15).
6. The auxiliary device for sampling smoke suitable for a high Wen Zhengya flue according to claim 5, wherein the quick-opening electromagnetic valve is quickly opened when a preset logic is met, compressed air is sprayed into the sampling tube to form a seal for the smoke, and the sealing performance of the air to the smoke is ensured when the smoke pressure in the flue abnormally fluctuates.
7. A smoke sampling aid for high Wen Zhengya flues according to any one of claims 1-3, wherein the injection pipe (7) is provided with an injection valve (13).
8. The auxiliary device for sampling flue gas suitable for high Wen Zhengya flue gas according to claim 7, wherein the injection valve is manually adjusted or automatically adjusted according to a preset control logic to ensure the sealing performance of air to flue gas when the pressure in the flue gas normally fluctuates.
9. A smoke sampling aid for a high Wen Zhengya flue according to any one of claims 1-3, wherein the purge tube (23) is provided with a purge valve (14).
10. A smoke sampling auxiliary device suitable for a high Wen Zhengya flue according to any one of claims 1-3, wherein the first connecting piece (2) and the second connecting piece (20) are independent components, and the first connecting piece (2) is connected with the front external connection tube (1) and the sampling tube (3) in a threaded manner; the second connecting piece (20) is connected with the rear external connection pipe (6) and the ejector (5) in a threaded manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910356235.7A CN110132663B (en) | 2019-04-29 | 2019-04-29 | Flue gas sampling auxiliary device suitable for high Wen Zhengya flue |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910356235.7A CN110132663B (en) | 2019-04-29 | 2019-04-29 | Flue gas sampling auxiliary device suitable for high Wen Zhengya flue |
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| CN110132663B true CN110132663B (en) | 2024-02-09 |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112014172A (en) * | 2020-08-11 | 2020-12-01 | 国家电投集团电站运营技术（北京）有限公司 | Flue gas sampling equipment and boiler system with same |
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