CN118010240A - Dilution sampling system and sampling probe vacuum degree measuring device and method thereof - Google Patents
Dilution sampling system and sampling probe vacuum degree measuring device and method thereof Download PDFInfo
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- CN118010240A CN118010240A CN202410242563.5A CN202410242563A CN118010240A CN 118010240 A CN118010240 A CN 118010240A CN 202410242563 A CN202410242563 A CN 202410242563A CN 118010240 A CN118010240 A CN 118010240A
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- 238000005070 sampling Methods 0.000 title claims abstract description 103
- 238000010790 dilution Methods 0.000 title claims abstract description 55
- 239000012895 dilution Substances 0.000 title claims abstract description 55
- 239000000523 sample Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005259 measurement Methods 0.000 claims abstract description 27
- 238000003113 dilution method Methods 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims description 13
- 239000004519 grease Substances 0.000 claims description 6
- 229920001296 polysiloxane Polymers 0.000 claims description 6
- 238000013461 design Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000011835 investigation Methods 0.000 abstract description 3
- 230000004044 response Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 69
- 238000012544 monitoring process Methods 0.000 description 15
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 239000000779 smoke Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
The invention discloses a dilution sampling system and a sampling probe vacuum degree measuring device and method thereof, wherein the sampling probe vacuum degree measuring device of the dilution sampling system comprises a gas passage, the gas passage is communicated with an original gas passage of a sampling probe, and the inner diameter of the gas passage is the same as that of the original gas passage of the dilution sampling probe; the side wall opening of the gas passage is connected with an external pipeline, the inner diameter of the external pipeline is smaller than that of the gas passage, the external pipeline is connected with a pressure sensor, and the pressure sensor is connected with a signal input end of a control system for measuring the concentration by a dilution method; the device avoids the problems in the prior art by means of modularized design, on one hand, the original structure is not required to be damaged, only the modules are required to be used as spliced bridges of the original structure, and the gas paths are overlapped, so that the original equipment structure is not changed even if the modules are removed; meanwhile, the modularized design is beneficial to overhaul and investigation, and the overhaul process is independent and is not coupled with the original system; on-line real-time continuous measurement of the vacuum degree of the probe is carried out on the premise of ensuring accurate measurement of the data of the CO 2, the sampling performance of the CO 2 sampling probe can be effectively judged, and when the sampling performance of the CO 2 sampling probe with unqualified vacuum degree data is reduced, quick maintenance response is achieved.
Description
Technical Field
The invention belongs to the technical field of dynamic pressure monitoring, and particularly relates to a vacuum degree measuring device of a sampling probe of a dilution sampling system.
Background
Based on the related technical requirements of the current carbon emission, enterprises in the important emission industry are urgently required to carry out scientific and reasonable on-line monitoring on the emission data of CO 2. The emission amount of carbon dioxide is calculated and obtained by the flow of the flue gas and the concentration of the carbon dioxide in the flue gas, so that in order to obtain the real and reliable emission amount of carbon dioxide, an accurate, stable and reliable method is required to be adopted for testing the concentration of the components.
The dilution sampling method is one of the internationally universal monitoring methods for gaseous pollutants, on the basis of direct extraction, the smoke is diluted to dry smoke which can be directly measured by clean zero air, and then the diluted gas to be measured is introduced into a gas analysis instrument for concentration measurement. The zero air (also called zero gas) is the gas without the gas component to be measured, which is obtained after the compressed air is subjected to a pretreatment device and the gas to be measured in the air is removed. Because the pretreatment of zero gas is before, the influence of moisture in the air on measurement is eliminated, heating and heat preservation are not needed, the maintenance amount is greatly reduced, the monitoring precision is high, and the real-time performance is good. The dilution ratio (the ratio of zero air to flue gas to be measured) of the measurement mode is an important parameter participating in measurement calculation, in the monitoring process, the change of the dilution ratio can be represented by the change of the vacuum degree of the dilution section, and when the vacuum degree is stable, the dilution ratio is stable, and the measurement result is stable. In the present stage, most dilution sampling methods do not have a device for monitoring the vacuum degree when measuring the concentration of the smoke components, and can be considered to have no device for monitoring the dilution ratio in real time. Once the sampling device is blocked due to pollution, dust and the like, or the pressure of compressed air is changed due to the failure of a front-end device and the like, the dilution ratio is possibly changed due to the abnormal reasons, so that the monitoring result of the final concentration is deviated. Therefore, it is important to perform the dilution stage vacuum degree detection in a reasonable manner.
In the prior art, in order to realize vacuum measurement, a pressure taking pipe for vacuum measurement is usually perforated on an original dilution section measuring component and led out, the original device is required to be destroyed, and an original dilution gas circuit is difficult to recover after being destroyed by a stainless steel structure and the like; when the vacuum degree measuring device or the pressure gauge and the gas circuit have problems and need to be overhauled, the gas circuit for measuring the vacuum degree is directly led out from the original gas circuit, the root of the problem is which part of the dilution section is difficult to be examined, and the overhauling process is highly coupled with the original system.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a sampling probe vacuum degree measuring device of a dilution sampling system, so as to ensure the rationality of on-line monitoring data of CO 2. The device is mainly structurally characterized in that a module is redesigned and processed in the middle of the venturi tube and the sonic sampling tube, and on-line real-time continuous measurement of the vacuum degree of the probe is performed on the premise of ensuring accurate measurement of CO 2 data. The real-time monitoring of the vacuum degree data can effectively judge the sampling performance of the CO 2 sampling probe, and when the sampling performance of the CO 2 sampling probe with unqualified vacuum degree data is reduced, the quick maintenance response is realized, so that the rationality of the CO 2 on-line monitoring data is ensured. Through field test, the device has excellent stability and expansibility, and can meet the use requirements of vast enterprises.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the vacuum degree measuring device of the sampling probe of the dilution sampling system comprises a gas passage, wherein the gas passage is communicated with the original gas passage of the sampling probe, and the inner diameter of the gas passage is the same as that of the original gas passage of the dilution sampling probe; the gas passageway lateral wall trompil is connected external pipeline, and external pipeline's internal diameter is less than the internal diameter of gas passageway, external pipeline connection pressure sensor, pressure sensor connect dilution method concentration measurement's control system's signal input part, and gas passageway and the original gas passageway of sampling probe can dismantle the connection.
Furthermore, the gas passage is embedded into the fixed module by adopting a pipeline, or the gas pipeline is arranged in the fixed module.
Further, the connection part of the gas passage and the original gas passage of the dilution sampling probe is sealed by a sealing gasket or sealing silicone grease.
Based on the sampling probe vacuum degree measuring device, the invention also provides a dilution sampling system, which comprises a vacuum degree measuring module, wherein the vacuum degree measuring module adopts the sampling probe vacuum degree measuring device, the gas passage inlet end of the vacuum degree measuring module is connected with the gas passage of the constant-current sampling module, and the gas passage outlet end of the vacuum degree measuring module is communicated with the venturi tube module.
Further, the vacuum degree measuring module, the constant current sampling module and the Venturi tube module all adopt a three-dimensional module structure.
Further, the gas path of the constant-current sampling module, the gas path in the vacuum degree measuring module and the venturi tube in the venturi tube module are of a three-dimensional module structure embedded with pipelines or formed in the three-dimensional module structure.
Further, the three-dimensional module structure of the vacuum degree measuring module, the constant current sampling module and the venturi tube module adopts a split type or an integrated type, and when the split type structure is adopted, a sealing gasket or sealing silicone grease is arranged on the connecting surface of each three-dimensional module structure.
Further, when the three-dimensional module structure of the vacuum degree measuring module, the constant current sampling module and the venturi tube module adopts a split structure, the vacuum degree measuring module is welded or bonded with the constant current sampling module and the venturi tube module.
The invention also provides a vacuum degree measuring method of the sampling probe of the dilution sampling system, wherein the vacuum degree measuring module adopts the vacuum degree measuring device of the sampling probe of the dilution sampling system, and a control system for measuring the concentration by a dilution method obtains a measuring signal from a vacuum degree sensor.
Further, when the vacuum degree value corresponding to the measurement signal exceeds the set value range, the control system for measuring the concentration by the dilution method gives an alarm in real time.
Compared with the prior art, the invention has at least the following beneficial effects: the device avoids the problems in the prior art by means of modularized design, on one hand, the original structure is not required to be damaged, only the modules are required to be used as spliced bridges of the original structure, and the gas paths are overlapped, so that the original equipment structure is not changed even if the modules are removed; meanwhile, the modularized design is beneficial to overhaul and investigation, and the overhaul process is independent and is not coupled with the original system, and in addition, the modularized design can be suitable for various dilution method equipment;
The shape can be changed along with the original shape of the dilution section device, is not limited by the style of a single product, has smaller volume and is convenient to process; integrating a pressure sensor adopted by vacuum measurement into a measuring probe box of a dilution method, and not increasing the volume of original equipment; the vacuum degree of the CO 2 sampling probe can be monitored in real time based on the device; timely grasping the sampling performance condition and the variation condition of the dilution ratio of the sampling system, and presenting visual performance data analysis and performance data auxiliary variation trend; reliable data support is provided for preventive maintenance, so that the failure rate of CO 2 monitoring is reduced; the rationality of the CO 2 on-line monitoring data is ensured through the analysis of the vacuum degree measurement data; the device is convenient for practical production equipment application in a modularized form, and can be combined with the existing multiple dilution method equipment for use;
Based on the trial of the current relevant industry standard, the method is helpful for practically solving the blank in the field of monitoring the vacuum degree of the dilution section of the sampling probe of the industry dilution method, and is convenient for measuring the vacuum degree of the dilution sampling probe.
Drawings
Fig. 1 is a schematic diagram of a device and an installation structure for conveniently measuring vacuum degree of a dilution sampling probe according to an embodiment of the present invention.
In the drawing, a 1-dilution gas inlet pipeline, a 2-venturi tube module, a 3-mixed gas outlet pipeline, a 4-constant current sampling module, a 5-vacuum degree measuring module, a 6-gas passage and a 7-external pipeline are arranged.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "middle", "lower", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The gas circuit of the dilution method measuring device comprises two gas inlets and one gas outlet, the two gas inlets are respectively sampling air suction of the sample gas to be measured and the pretreated diluted zero gas, the one gas outlet is the total sample gas after the sample gas to be measured and the zero gas are mixed, the total sample gas enters the analysis test instrument to carry out concentration analysis test, the complete measuring device probe adopts a sonic orifice, an air extractor behind the sonic orifice of a venturi tube blows against the throat of the venturi tube, so that enough vacuum can be generated to suck the smoke, the vacuum threshold condition of normal work of the sonic orifice is met, and the main components of the probe work according to the principle of pneumatics.
Based on the above, the invention provides a vacuum degree measuring device of a sampling probe of a dilution sampling system, which comprises a gas passage 6, wherein the gas passage 6 is communicated with the original gas passage of the sampling probe, and the inner diameter of the gas passage 6 is the same as that of the original gas passage of the dilution sampling probe; the gas passage 6 is detachably connected with the original gas passage of the sampling probe; the side wall opening of the gas passage is connected with an external pipeline 7, the inner diameter of the external pipeline 7 is smaller than that of the gas passage 6, the external pipeline 7 is connected with a pressure sensor, and the pressure sensor is connected with a signal input end of a dilution method concentration measurement control system.
Preferably, the external pipeline 7 is also provided with a valve.
In the use scene, the sound speed small hole and the venturi tube module can normally work as long as the gas to be detected can be continuously provided; but there are two special cases: firstly, when a small sound speed hole of the venturi tube is blocked by dust and the like, the resistance coefficient of the venturi tube serving as a resistance component is not constant any more, so that the vacuum degree threshold is not met; secondly, the aerodynamic components in front of and behind the air extractor or device fail, resulting in an incorrect operation of the above-mentioned apparatus. The measurement faults generated by the two special conditions cannot be reflected in time in the original system, so that the vacuum degree measurement module is added between the two modules, and the real-time monitoring and the timely alarm of various abnormal conditions can be realized.
The embodiment of the invention shown in fig. 1 can be divided into an upper part, a middle part and a lower part, the vacuum degree measuring device is arranged in a middle module, the upper module is a venturi tube, the lower module is a sound speed sampling tube, and the sound speed sampling tube can control the sampling ratio. The invention designs and processes a module in the middle of the Venturi tube and the sonic sampling tube, a gas passage is arranged in the module, the upper part and the lower part of the module can be spliced and connected with the original device, the inner diameter of the gas passage is the same as the inner diameter of the original gas passage, and the original gas passage form is kept unchanged; and a three-way gas passage is formed in the side wall of the gas passage, the diameter of the three-way gas passage is smaller than that of the gas passage, and the three-way gas passage is connected with a hose to a pressure sensor for vacuum measurement. Based on the method for measuring the vacuum degree of the sampling probe of the dilution sampling system, which is disclosed by the invention, the vacuum degree measuring device of the sampling probe of the dilution sampling system is adopted, and a control system for measuring the concentration of the dilution method acquires a measuring signal from a vacuum degree sensor; and when the vacuum degree value corresponding to the measurement signal exceeds the set value range, the control system for measuring the concentration by the dilution method gives an alarm in real time.
The invention also provides a dilution sampling system, which comprises a vacuum degree measuring module 5, wherein the vacuum degree measuring module 5 adopts the vacuum degree measuring device of the sampling probe of the dilution sampling system, the gas passage inlet end of the vacuum degree measuring module 5 is connected with the gas passage of the constant-current sampling module 4, and the gas passage outlet end of the vacuum degree measuring module 5 is communicated with the venturi tube module 2.
The pressure sensor for measuring the vacuum degree has smaller volume, and can also be integrated in a dilution method probe box, so that the vacuum degree measurement and the original dilution method measurement scheme are organically fused, and complete dilution measurement is carried out.
The three-dimensional module structures of the vacuum degree measuring module 5, the constant current sampling module 4 and the venturi tube module are split or integrated, and when the split structure is adopted, a sealing gasket or sealing silicone grease is arranged on the connecting surface of each three-dimensional module structure.
As an embodiment of the invention, when the three-dimensional module structure of the vacuum degree measuring module 5, the constant current sampling module 4 and the venturi tube module is split, the whole module can be welded or adhered in the original measuring module, and meanwhile, a sealing gasket and sealing silicone grease are added at the connecting surface to ensure that the connecting surface of the gas passage component is not leaked.
As a preferred embodiment, the module performs shape design and air path adjustment according to different forms of dilution sampling sections, and ensures that the module is uniform in form and structure with the original device.
Optionally, when the three-dimensional module structure of the vacuum degree measuring module 5, the constant current sampling module 4 and the venturi tube module adopts an integrated structure, the three-dimensional module structure can be integrally formed in a 3D printing or machining mode, a connecting surface does not exist between each two parts, and packaging, personalized design and machining are facilitated.
The vacuum degree measurement sampling port led out by the module is used as the caliber of a cleaning venturi tube and a sound speed small tube when the system is blocked and overhauled, compressed air can be led in to purge the venturi tube and the sound speed small tube, and the dust cleaning and cleaning work of the whole dilution section can be completed.
Whether a pipe is embedded into the three-dimensional module structure or a gas passage is formed in the three-dimensional module structure, the important point is that the pipe diameter of the joint is ensured to be processed according to the embodiment, and the sealing structure of the joint surface meets the requirements.
The device can avoid the problems in the prior art by means of modularized design, on one hand, the original structure is not required to be damaged, only the modules are used as splicing or mounting bridges of the original structure, and the gas paths are overlapped, so that the original equipment structure is not changed even if the modules are removed; meanwhile, the modularized design is beneficial to overhaul and investigation, and the overhaul process is independent and is not coupled with the original system; in addition, the modularized design can be suitable for dilution method equipment of various brands, and is not only used for the use scene of the invention; the device disclosed by the invention is not only suitable for equipment of new projects, but also suitable for technical transformation of the existing equipment. The original dilution gas circuit can be drilled at a proper place, so that the similar purpose can be realized, and the device can be used for various scenes with similar working conditions.
The above is only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. The vacuum degree measuring device of the sampling probe of the dilution sampling system is characterized by comprising a gas passage (6), wherein the gas passage (6) is communicated with the original gas passage of the sampling probe, and the inner diameter of the gas passage (6) is the same as that of the original gas passage of the dilution sampling probe; the gas passageway lateral wall trompil is connected external pipeline (7), and the internal diameter of external pipeline (7) is less than the internal diameter of gas passageway (6), and pressure sensor is connected to external pipeline (7), and pressure sensor connects dilution method concentration measurement's control system's signal input part, and gas passageway (6) can dismantle with the original gas passageway of sampling probe and be connected.
2. The dilution sampling system sampling probe vacuum measuring device according to claim 1, wherein the gas passage (6) is embedded in a fixed module by a pipe or the gas pipeline is opened in the fixed module.
3. The vacuum measuring device of the sampling probe of the dilution sampling system according to claim 1, wherein the connection part of the gas passage (6) and the original gas passage of the dilution sampling probe is sealed by a sealing gasket or sealing silicone grease.
4. A dilution sampling system, which is characterized by comprising a vacuum degree measuring module (5), wherein the vacuum degree measuring module (5) adopts the dilution sampling system sampling probe vacuum degree measuring device according to any one of claims 1-3, the inlet end of a gas passage of the vacuum degree measuring module (5) is connected with a gas passage of a constant-current sampling module (4), and the outlet end of the gas passage of the vacuum degree measuring module (5) is communicated with a venturi tube module (2).
5. The dilution sampling system according to claim 4, wherein the vacuum measuring module (5), the constant flow sampling module (4) and the venturi module (2) are all of a three-dimensional module structure.
6. The dilution sampling system according to claim 4, wherein the gas path of the constant flow sampling module (4), the gas path in the vacuum measuring module (5) and the venturi in the venturi module (2) are pipe-embedded or formed in a three-dimensional module structure.
7. The dilution sampling system according to claim 4, wherein the three-dimensional module structure of the vacuum degree measuring module (5), the constant flow sampling module (4) and the venturi tube module is split or integrated, and when the split structure is adopted, a sealing gasket or sealing silicone grease is arranged on the connecting surface of each three-dimensional module structure.
8. The dilution sampling system according to claim 5, wherein the vacuum measurement module (5) is welded or glued to the constant flow sampling module (4) and the venturi module.
9. A method for measuring the vacuum degree of a sampling probe of a dilution sampling system, which is characterized in that a vacuum degree measuring module (5) adopts the vacuum degree measuring device of the sampling probe of the dilution sampling system according to any one of claims 1-4, and a control system for measuring the concentration of the dilution method obtains a measuring signal from a vacuum degree sensor.
10. The method for measuring the vacuum degree of the sampling probe of the dilution sampling system according to claim 9, wherein the control system for measuring the concentration of the dilution method gives an alarm in real time when the vacuum degree value corresponding to the measurement signal exceeds a set value range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410242563.5A CN118010240A (en) | 2024-03-04 | 2024-03-04 | Dilution sampling system and sampling probe vacuum degree measuring device and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410242563.5A CN118010240A (en) | 2024-03-04 | 2024-03-04 | Dilution sampling system and sampling probe vacuum degree measuring device and method thereof |
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| Publication Number | Publication Date |
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| CN118010240A true CN118010240A (en) | 2024-05-10 |
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| CN202410242563.5A Pending CN118010240A (en) | 2024-03-04 | 2024-03-04 | Dilution sampling system and sampling probe vacuum degree measuring device and method thereof |
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| Country | Link |
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| CN (1) | CN118010240A (en) |
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- 2024-03-04 CN CN202410242563.5A patent/CN118010240A/en active Pending
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