CN109540612B - Multichannel constant-speed flue gas sampling device - Google Patents
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- CN109540612B CN109540612B CN201910077750.1A CN201910077750A CN109540612B CN 109540612 B CN109540612 B CN 109540612B CN 201910077750 A CN201910077750 A CN 201910077750A CN 109540612 B CN109540612 B CN 109540612B
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- 238000005070 sampling Methods 0.000 title claims abstract description 247
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 239000003546 flue gas Substances 0.000 title claims abstract description 61
- 230000007246 mechanism Effects 0.000 claims abstract description 20
- 238000004321 preservation Methods 0.000 claims abstract description 14
- 238000005259 measurement Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 claims description 2
- 239000000779 smoke Substances 0.000 description 16
- 238000001514 detection method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
-
- 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
- G01N2001/225—Sampling from a flowing stream of gas isokinetic, same flow rate for sample and bulk gas
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- Health & Medical Sciences (AREA)
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- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
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- General Health & Medical Sciences (AREA)
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- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The utility model relates to a multichannel constant-speed flue gas sampling device which comprises a sampling tube bundle, an auxiliary fixing mechanism, a constant-speed adjusting mechanism and a flue gas analyzer, wherein the auxiliary fixing mechanism is arranged on the sampling tube bundle; the sampling tube bundle consists of a plurality of sampling tubes with equal diameters and different lengths, and the joint of each sampling tube and the sampling nozzle is arranged on the same horizontal plane; the tail end of each sampling tube is connected with a control valve; the heat preservation sleeve is wrapped outside the sampling tube bundle outside the flue, a bearing is sleeved outside the tail end of the heat preservation sleeve, the bearing is connected with the handle, and the bearing is matched with the auxiliary fixing mechanism, so that the sampling tube bundle can rotate in the flue gas pipeline; the pipe wall of the longest sampling pipe is provided with a slideway along the length direction of the sampling pipe, the pitot tube is fixed on the slideway and can slide back and forth on the slideway, the pipe body of the pitot tube is carved with scales, and the head of the pitot tube is aligned with the sampling nozzle of the longest sampling pipe during initial sampling. The device can be even gather the flue gas in the flue, improves measurement accuracy.
Description
Technical Field
The utility model relates to the field of flue gas detection of coal-fired boilers, in particular to a multichannel constant-speed flue gas sampling device.
Background
The flue gas monitoring refers to monitoring the concentration and total emission amount of gaseous pollutants and particulate matters emitted by an atmospheric pollution source. At present, the electric power supply in China is mainly thermal power generation. The flue gas discharged by the coal contains smoke dust, carbon dioxide, sulfur dioxide, nitrogen oxides and a small amount of carbon monoxide, and the smoke dust directly affects the environmental quality of the atmosphere. The sampling is now carried out in a mobile multipoint manner, which has the disadvantage that the sampling gun needs to be long enough so that when moved close to the outside, a part of the sampling tube is exposed to the atmosphere and condensation of water vapour occurs. And the sampling nozzle can not be guaranteed to be always positioned on the same plane in the moving process (the sampling staff is required to keep the stability of the sampling gun at any time in the moving process, so that the sampling nozzle is positioned on the same plane in the moving process), and the sampling is not representative. Therefore, how to ensure the representativeness of smoke collection becomes a great problem for smoke detection.
The utility model of patent number 201820318725.9 provides a fixed multi-channel flue gas sampling gun, which consists of a sampling tube bundle, a fixed sleeve, a pipeline switching assembly and a flue gas analyzer, wherein a plurality of sampling tubes can integrally slide along the auxiliary fixed sleeve, the outward pulling structure can lead the sampling tubes to incline in the use process, and more parts of the sampling tubes are exposed in the air and are easy to corrode; and the fixed sleeve can not rotate, and the sampling tube is directly inserted during use and can be mixed with partial non-detection gas, so that the collected sample is inaccurate, the sampling gun can not sample at the same speed, and the sampled sample is not representative.
In addition, the constant-speed sampling method is adopted when the flue gas is sampled, namely the speed of the flue gas entering the sampling nozzle is equal to the flue gas flow rate at the sampling point, so that the measurement result is more accurate. When the sampling smoke flow rate is different from the sampling point flow rate, errors can be caused to the sampling and measuring results. When the sampling speed is higher than the flue gas flow rate of the sampling point, the direction is easy to change due to small inertia of gas molecules, and the direction of the particulate matters is not easy to change due to large inertia of the gas molecules, so that partial airflow beyond the edge of the sampling nozzle is pumped into the sampling nozzle, and the particulate matters in the airflow advance in the original direction and do not enter the sampling nozzle, so that the measurement result is lower; when the sampling speed is smaller than the sampling point smoke flow rate, the situation is opposite, so that the measurement result is higher.
Disclosure of Invention
Aiming at the defects of the technology, the utility model solves the technical problem of providing the multichannel constant-speed flue gas sampling device. The device has overcome current sampling device and has easily corroded, easily slope when flue gas collection sampling pipe, can not sample with a constant speed and cause the inhomogeneous problem of sampling, the flue gas in the collection flue that can be even can improve the measurement accuracy of pollutant in the flue gas.
The technical scheme adopted for solving the technical problems is as follows: the multi-channel constant-speed flue gas sampling device comprises a sampling tube bundle, an auxiliary fixing mechanism, a constant-speed adjusting mechanism and a flue gas analyzer; it is characterized in that the method comprises the steps of,
the sampling tube bundle consists of a plurality of sampling tubes with equal diameters and different lengths, and the joint of each sampling tube and the sampling nozzle is arranged on the same horizontal plane; the tail end of each sampling tube is connected with a control valve; the heat preservation sleeve is wrapped outside the sampling tube bundle outside the flue, a bearing is sleeved outside the tail end of the heat preservation sleeve, the bearing is connected with the handle, and the bearing is matched with the auxiliary fixing mechanism, so that the sampling tube bundle can rotate in the flue gas pipeline;
the base of the auxiliary fixing mechanism is fixed with the ground, a circular tube-shaped tray is arranged at the upper part of the base, threaded holes are formed in the upper pipe wall and the lower pipe wall of the front part and the rear part of the tray, bolts in the threaded holes are connected with a bending gasket, and the gasket at the rear part acts with a bearing at the tail end of the heat-insulating sleeve;
the pipe wall of the longest sampling pipe is provided with a slideway along the length direction of the sampling pipe, the pitot tube is fixed on the slideway and can slide back and forth on the slideway, the pipe body of the pitot tube is carved with scales, and the head of the pitot tube is aligned with the sampling nozzle of the longest sampling pipe during initial sampling.
Compared with the prior art, the utility model has the beneficial effects that:
1) The sampling tube bundle is formed by combining a plurality of identical sampling tubes, the independent collection is not affected when the flue gas is collected, the lengths of the sampling tubes are different, and the flue gas at different transverse positions on the same section can be effectively collected, so that the uniform collection of the flue gas in the flue is ensured, and the detection accuracy is greatly improved;
2) The bearing is arranged at the tail end of the sampling tube bundle, so that the sampling tube bundle can well rotate, and the sampling tube bundle does not work when the sampling tube bundle stretches into a flue, the sampling inlet faces away from the flow direction of the flue gas, and the sampling tube bundle is rotated 180 degrees after the sampling inlet reaches the sampling position, so that the sampling port faces the flow direction of the flue gas to start sampling. The device can well enable the sampling gun to complete the rotation process, and compared with the existing practical application process, a worker needs to send the smoke inlet of the sampling tube in the sampling tube bundle and the smoke flowing direction in the hearth to the sampling position in the opposite direction, then rapidly rotates 180 degrees manually and then starts the sampling work, so that the operation of the worker can be facilitated, and the sampling error is reduced;
3) The utility model adopts equal pipe diameter in the sampling pipe, the effect is the same as the current movable multipoint sampling, but the sampling pipe does not need to move, thereby reducing the error caused by operation;
4) According to the utility model, the heat insulation layer (heat insulation sleeve) is arranged at the tail end of the sampling tube bundle, the sampling tube bundle is fixed in the measuring process, the possibility that the sampling tube bundle is exposed to air is avoided, the service life of the sampling tube bundle is prolonged, and the whole device is light in weight and convenient to carry;
5) According to the utility model, the position of the pitot tube can be changed through the fixed slideway on the sampling tube, the constant-speed sampling of different sampling tubes can be satisfied by adjusting the position of the pitot tube, the differential pressure of different positions can be measured, the differential pressure signal acquired by the gas differential pressure transmitter is converted into an electric signal, and the electric signal is input into the singlechip to control and adjust the rotating speed and flow of the speed regulating pump, so that the air inlet speed of the sampling tube is consistent with the flue gas speed, and the constant-speed sampling is satisfied.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present utility model;
FIG. 2 is a top view of a sampling tube bundle of the present utility model;
FIG. 3 is a cross-sectional view taken along section A-A of the present utility model;
1, a sampling tube 1; 2. a sampling tube 2; 3. a sampling tube 3; 4. a pitot tube; 5. a handle; 6. a fixing bolt; 7. a signal line; 8. a sampling hose; 9. a bearing; 10. a host; 11. a speed regulating pump; 12. a flue gas analyzer; 13. a fixing auxiliary device; 14. a slideway; 15. a rubber gasket; 16, a heat preservation sleeve; 17. a control valve; 18. a round tubular tray.
Detailed Description
The novel embodiments are described in detail below with reference to the drawings and examples, but are not to be construed as limiting the scope of the claims of the present application.
The multi-channel constant-speed flue gas sampling device (device is referred to as a device in short, and see fig. 1-3) comprises a sampling tube bundle, an auxiliary fixing mechanism, a constant-speed adjusting mechanism and a flue gas analyzer;
the sampling tube bundle consists of a plurality of sampling tubes with equal diameters and unequal lengths, and the arrangement mode is horizontally arranged in sequence from long to short according to the lengths of the sampling tubes; the joint of each sampling tube and the sampling nozzle is arranged on the same horizontal plane; the tail end of each sampling tube is connected with a control valve 17, the sampling tubes can be switched according to requirements, and the three sampling tubes have the same diameter but different lengths, so that a tube bundle is formed to sample different positions in the flue; the heat preservation sleeve 16 is wrapped outside the sampling tube bundle outside the flue, and a bearing is sleeved outside the tail end of the heat preservation sleeve and is used for being matched with the auxiliary fixing mechanism so that the sampling tube bundle can rotate in the flue gas pipeline;
the base of auxiliary fixing mechanism is fixed with ground, has pipe form tray 18 at its upper portion, and upper and lower both pipe walls at tray front and back part all are provided with the screw hole, and threaded hole's bolt is connected with a crooked gasket, can control the fixed elasticity of sampling rifle through the height of adjusting bolt position, can adapt to the sampling rifle of different radiuses, and the gasket at front portion plays auxiliary stay's effect, and the gasket at rear portion plays with the terminal bearing effect of heat preservation sleeve.
The constant-speed adjusting mechanism comprises a pitot tube, a gas pressure difference transmitter, a singlechip and a speed regulating pump;
a slideway 14 is arranged on the longest sampling tube wall along the length direction of the sampling tube, the pitot tube is fixed on the slideway and can slide back and forth on the slideway, and scales are carved on the pitot tube body, so that the alignment of the head part of the pitot tube and the sampling nozzle can be accurately ensured;
the gas pressure difference transmitter can collect the pressure difference of the pitot tube to be converted into an electric signal to be input into the singlechip;
the singlechip has the functions of acquisition, calculation, output and feedback control, and can adjust the rotating speed and the flow of the speed regulating pump in real time according to the change condition of the flow rate of the flue gas;
the speed regulating pump can regulate the rotating speed and flow of the speed regulating pump according to the output signal of the singlechip.
The number of the sampling tubes in the sampling tube bundle can be added according to the requirement of sampling points in practical application, and the lengths are different, so that the flue gas with the same section and different positions can be collected.
The sampling tube bundle is formed by combining a plurality of sampling tubes which are made of the same materials and have different tube diameters, the independent collection of the sampling tubes is not affected when the flue gas is collected, the sampling tubes have different lengths, and flue gas particles at different positions on the same height section can be effectively collected, so that the uniform collection of the flue gas in the flue is ensured, and the detection accuracy is greatly improved.
The working principle of the sampling device of the utility model is as follows: the sampling tube bundle is vertically inserted into the flue gas pipeline, the sampling tube bundle is vertically arranged with the flue gas flowing direction, and all sampling tubes in the sampling tube bundle are opposite to the flue gas flowing speed direction during initial insertion, and after the sampling tube bundle is installed, the sampling tube bundle is rotated through the handle 5 and the bearing, so that the sampling tube bundle is opposite to the flue gas flowing speed direction. The relative positions of the sampling tube bundles are determined in the earlier stage of a user, the pitot tube body is carved with measurement scales, the current position can be determined to be opposite to the sampling tube by pulling the pitot tube outwards and observing the pulling distance of the pitot tube, then the control valves of the corresponding sampling tubes are controlled to be opened or closed, the multipoint sampling of different position points on the same straight line at the same height in the flue is completed, and the position points of the multipoint sampling are approximately considered to be on the same straight line due to certain deviation of the influence of the pipe diameter of the sampling tubes.
The sampling tube bundle is fixed after being arranged in the flue gas pipeline, no external pulling is performed in the measuring process, the multipoint sampling is completed through the external pulling pitot tube,
when sampling is started, the pitot tube head is aligned with the sampling nozzle of the longest sampling tube, when the pitot tube is extracted, the pitot tube is aligned with the sampling nozzle through the scale of the pitot tube body, and when the middle sampling tube 2 is required to be sampled, the pitot tube is extracted for 0.5m and can be aligned with the sampling nozzle of the sampling tube 2; when the middle sampling tube 2 is switched, the handle rotating bearing can be used for enabling the middle sampling tube to face back to back blowing, the smoke in the sampling tube to be sampled is emptied, and then the sampling tube is just right opposite to sampling, so that the sampling precision is further improved.
The relative length of the sampling pipes corresponds to the position of the sampling point in the flue to be collected, the position of the sampling point in the flue can be subjected to experimental study by a user in the early stage, the sampling point of which position is determined to be more representative, and the representative position is sampled by the sampling pipe.
Example 1
The multi-channel constant-speed flue gas sampling device in the embodiment is shown in fig. 1, and comprises three sampling pipes which are respectively a longest sampling pipe 1, a middle sampling pipe 2 and a shortest sampling pipe 3 and are respectively 1.8m, 1.3m and 0.8m in length, the inlet interval of the three sampling pipes is 0.5m, a slideway matched with a pitot tube is arranged on the outer wall of the longest sampling pipe 1, the pitot tube is 1.8m in length, obvious scales are carved on the outer side of the pitot tube, and when the pitot tube is pulled out outwards for 0.5m, the front end of the pitot tube is transited from the inlet of the longest sampling pipe 1 to the inlet of the middle sampling pipe 2. The Pitot tube is connected with the gas pressure difference transmitter, the pressure difference of the smoke is measured, the gas pressure difference transmitter is fed with the pressure difference signal through a signal wire, the pressure difference signal is converted into an electric signal, the electric signal is input into the singlechip, and the singlechip adjusts the rotating speed and the flow of the speed regulating pump in real time according to the input signal of the smoke flow rate conversion.
The tail ends of the 3 sampling pipes are matched with a four-way valve, and the independent switching of the three sampling pipes can be completed by adjusting the switch of the four-way valve.
The slide 14 of the outer wall of the longest sampling tube is in a convex shape in cross section, and the outer wall of the pitot tube is welded with a T-shaped plate, so that the pitot tube can slide on the outer wall of the longest sampling tube 1, and the pressure difference of the inlet positions of different sampling tubes can be measured.
The tail part of the sampling tube bundle is provided with a 30cm heat preservation sleeve 16, the tail end of the heat preservation sleeve is matched with a bearing, the radius of the bearing is the outer diameter of the heat preservation sleeve, the sampling tube bundle is placed on a circular tubular tray of the auxiliary fixing mechanism 13 in the sampling preparation stage, the bearing 9 is fixed by a rubber gasket 15 at the tail end of the circular tubular tray, and the front end of the heat preservation sleeve is fixed by a bolt 6.
The base of the auxiliary fixing mechanism is a disc, the disc is connected with the ground through a bolt, the center of the disc is a supporting rod, and a circular tube-shaped tray is arranged at the top end of the supporting rod.
The working process of the sampling device of the embodiment is as follows: the method comprises the steps that a sampling tube inlet is opposite to the flow direction of smoke in a hearth (the opposite is that the smoke inlet of the sampling tube is opposite to the flow direction of the smoke in the hearth, namely, the front view of the bent part of the sampling tube is a parabola with an upward opening at the moment), the sampling tube extends into a flue, the sampling tube is fixed after rotating for 180 degrees, an initial pitot tube is positioned at the inlet of the longest sampling tube 1, a switch corresponding to the four-way valve and the longest sampling tube 1 is opened, a speed regulating pump is controlled through a singlechip, so that the current air inlet speed of the sampling tube is consistent with the smoke speed, and the longest sampling tube 1 can be sampled at the same speed (the same speed refers to the same flow speed of the smoke in the flue and the flow speed in the sampling tube; after the sampling time is over, the four-way valve is closed, the pitot tube is extracted outwards for 0.5m to correspond to the inlet position of the middle sampling tube 2, and the switch corresponding to the four-way valve and the middle sampling tube 2 is opened to finish the transition from the longest sampling tube 1 to the middle sampling tube 2.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (3)
1. A multichannel constant-speed flue gas sampling device comprises a sampling tube bundle, an auxiliary fixing mechanism, a constant-speed adjusting mechanism and a flue gas analyzer; it is characterized in that the method comprises the steps of,
the sampling tube bundle consists of a plurality of sampling tubes with equal diameters and different lengths, and the joint of each sampling tube and the sampling nozzle is arranged on the same horizontal plane; the tail end of each sampling tube is connected with a control valve; the heat preservation sleeve is wrapped outside the sampling tube bundle outside the flue, a bearing is sleeved outside the tail end of the heat preservation sleeve, the bearing is connected with the handle, and the bearing is matched with the auxiliary fixing mechanism, so that the sampling tube bundle can rotate in the flue gas pipeline;
the base of the auxiliary fixing mechanism is fixed with the ground, a circular tube-shaped tray is arranged at the upper part of the base, threaded holes are formed in the upper pipe wall and the lower pipe wall of the front part and the rear part of the tray, bolts in the threaded holes are connected with a bending gasket, and the gasket at the rear part acts with a bearing at the tail end of the heat-insulating sleeve;
a slideway is arranged on the pipe wall of the longest sampling pipe along the length direction of the sampling pipe, a pitot tube is fixed on the slideway and can slide back and forth on the slideway, scales are carved on the pipe body of the pitot tube, and the head of the pitot tube is aligned with a sampling nozzle of the longest sampling pipe during initial sampling;
the plurality of sampling tubes are horizontally arranged in sequence from long to short according to the length of the sampling tubes; the section of the slideway 14 on the outer wall of the longest sampling tube is in a convex shape, and the outer wall of the pitot tube is welded with a T-shaped plate, so that the pitot tube can slide on the outer wall of the longest sampling tube 1 so as to measure the pressure difference at the inlet positions of different sampling tubes;
the sampling tube bundle is formed by combining a plurality of identical sampling tubes, independent collection is not affected when the flue gas is collected, the sampling tubes are different in length, and the flue gas at different transverse positions on the same section can be effectively collected, so that the uniform collection of the flue gas in the flue is ensured;
the bearing is arranged at the tail end of the sampling tube bundle, so that the sampling tube bundle can well rotate, and the sampling tube bundle does not work when the sampling tube bundle stretches into the flue, the sampling inlet is opposite to the flow direction of the flue gas, and after the sampling position is reached, the sampling tube bundle is rotated for 180 degrees, so that the sampling port is opposite to the flow direction of the flue gas, and the purpose of preventing the sampling tube bundle from collecting the flue gas which does not meet the requirements when the sampling tube bundle enters the flue gas is achieved;
the sampling tube is of equal tube diameter and does not need to move any more, so that errors caused by operation are reduced, the sampling tube bundle is fixed in the measuring process, the possibility that the sampling tube bundle is exposed to air is avoided, and the service life of the sampling tube bundle is prolonged;
the pitot tube can change positions through the fixed slide way on the sampling tube, constant-speed sampling of different sampling tubes can be met by adjusting the positions of the pitot tube, differential pressure of different positions can be measured, differential pressure signals acquired by the gas differential pressure transmitter are converted into electric signals, and the electric signals are input into the singlechip to control and adjust the rotating speed and flow of the speed regulating pump, so that the air inlet speed of the sampling tube is consistent with the flue gas speed, and constant-speed sampling is met;
the working principle of the sampling device is as follows: the sampling tube bundles are vertically inserted into the flue gas pipeline, the sampling tube bundles are vertically arranged with the flue gas flowing direction, all sampling tubes in the sampling tube bundles are opposite to the flue gas flowing speed direction during initial insertion, and after the sampling tube bundles are installed, the sampling tube bundles are rotated through the handle and the bearing, so that the sampling tube bundles are opposite to the flue gas flowing speed direction; the relative positions of the sampling tube bundles are determined in the earlier stage of a user, the pitot tube body is carved with measurement scales, the current position can be determined to be opposite to the sampling tube by outwards pulling the pitot tube and observing the pulling distance of the pitot tube, then the control valves of the corresponding sampling tubes are controlled to be opened or closed, and the multipoint sampling of different position points on the same straight line with the same height in the flue is completed.
2. The multi-channel constant velocity flue gas sampling apparatus according to claim 1, wherein the difference in length between adjacent sampling tubes is 0.5m.
3. The multi-channel constant velocity flue gas sampling apparatus according to claim 1, wherein the constant velocity adjustment mechanism comprises a pitot tube, a differential gas pressure transducer, a single chip microcomputer, and a speed regulating pump.
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| CN110426249B (en) * | 2019-08-06 | 2022-05-20 | 无锡威孚力达催化净化器有限责任公司 | Multi-probe sampling device, and ammonia gas mixing uniformity testing system and method |
| CN113916610A (en) * | 2020-07-10 | 2022-01-11 | 河北工业大学 | Fixed source heavy metal sampling device and using method thereof |
| CN114739758B (en) * | 2022-06-10 | 2022-08-23 | 南京波瑞自动化科技有限公司 | Speed-adjustable sampling device of static pressure balance method |
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| GB927271A (en) * | 1958-09-16 | 1963-05-29 | Coal Industry Patents Ltd | Improvements in or relating to sampling apparatus |
| US4120661A (en) * | 1977-03-03 | 1978-10-17 | Nihon Denshi Kabishiki Kaisha | Sampling device |
| CN103513053A (en) * | 2012-06-29 | 2014-01-15 | 中国科学院大连化学物理研究所 | Device for synchronously adjusting direction of pitot tube sampling hole and sampling gun in rotating mode |
| CN204575401U (en) * | 2015-03-27 | 2015-08-19 | 国家电网公司 | A kind of Multi-channel flue gas sampling apparatus |
| CN106018002A (en) * | 2016-05-17 | 2016-10-12 | 南京友智科技有限公司 | Matrix type mixed constant-speed sampling device |
| CN207937428U (en) * | 2018-03-08 | 2018-10-02 | 山东中实易通集团有限公司 | Fixed Multi-channel flue gas sampling gun |
| CN209589591U (en) * | 2019-01-28 | 2019-11-05 | 河北工业大学 | A kind of multichannel constant speed flue gas sampler |
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| CN109540612A (en) | 2019-03-29 |
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