CN113899665A - Particulate matter real-time measuring method based on beta-ray absorption/light scattering principle - Google Patents
Particulate matter real-time measuring method based on beta-ray absorption/light scattering principle Download PDFInfo
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- CN113899665A CN113899665A CN202111091872.XA CN202111091872A CN113899665A CN 113899665 A CN113899665 A CN 113899665A CN 202111091872 A CN202111091872 A CN 202111091872A CN 113899665 A CN113899665 A CN 113899665A
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- 230000005250 beta ray Effects 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000000149 argon plasma sintering Methods 0.000 title claims abstract description 15
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 13
- 239000013618 particulate matter Substances 0.000 title claims abstract description 13
- 238000001514 detection method Methods 0.000 claims abstract description 113
- 230000003287 optical effect Effects 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000004458 analytical method Methods 0.000 claims description 20
- 238000000691 measurement method Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000005070 sampling Methods 0.000 abstract description 5
- 238000012937 correction Methods 0.000 abstract description 3
- 238000007791 dehumidification Methods 0.000 abstract 1
- 238000000605 extraction Methods 0.000 abstract 1
- 238000013461 design Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 239000008277 atmospheric particulate matter Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 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
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
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Abstract
The invention discloses a real-time particulate matter measuring method based on a beta-ray absorption/light scattering principle, which comprises the steps that a gas sample enters a main channel, namely a common channel, is subjected to heating and dehumidification treatment, is analyzed by an optical detection assembly and then enters a gas path control assembly, the gas path control assembly comprises n gas path channels, and switching is carried out between a direct gas path channel and a detection gas path channel according to preset conditions; the invention ensures that different detection components measure the same sample, so the correction value is more accurate, the whole structure is more compact, the air pump works continuously and uninterruptedly, the data measured by the optical scattering module is ensured to be continuous and effective, when the beta-ray detection module moves the paper tape to change the enrichment point, the air path is switched automatically, the air flow bypasses the beta-ray detection module after passing through the optical scattering module and is directly discharged through the air pump, the beta-ray detection module is ensured not to be influenced by air extraction when moving the paper tape, and the next sampling period can be normally entered on the premise of not turning off the pump.
Description
Technical Field
The invention relates to the field of atmospheric particulate matter detection, in particular to a particulate matter real-time measurement method based on a beta-ray absorption/light scattering principle.
Background
The gas circuit system of the present real-time particulate matter measuring device based on the beta-ray absorption-light scattering principle mainly comprises two types: a gas distributing path system and a gas sharing path system.
In the gas distribution channel system, the beta-ray method and the light scattering method are not used for measuring particles in the same gas channel, and measurement errors can be caused by taking the beta-ray method as a standard.
In the common gas path system, although the serial design of the beta-ray detection module and the optical scattering module can ensure the consistency of target gas samples measured by the beta-ray detection module and the optical scattering module, the air suction pump stops working at the moment because the beta-ray detection module needs to move the paper tape to replace the enrichment point after the completion of a sampling period, and the design of the common gas path can cause the concentration of the measured data of the optical scattering module in the period of stopping air suction to be close to 0, so that a mode and a method which can share the common path and ensure the continuity and the effectiveness of the measured data of the optical scattering module need to be found.
Disclosure of Invention
In view of the above, the present invention provides a method for measuring particles in real time based on the β -ray absorption/light scattering principle, which includes entering a main channel for a gas sample containing a substance to be measured, performing heating and dehumidifying processing by a heating and dehumidifying module, analyzing by an optical detection module, and transmitting analysis data to an analysis control module, where the gas sample enters a gas path control module, the gas path control module includes n gas path channels, and performs gas path switching according to preset conditions, where the gas path channel includes at least two gas path channels, one of which is a straight gas path channel that directly discharges the gas sample flowing in, and the other is a first detection module channel that discharges the gas sample after entering the first detection module channel and entering the first detection module for analysis by the gas path control module, the gas circuit control assembly switches the gas circuit according to the preset conditions, and meanwhile, the main channel keeps the gas sample continuously, uninterruptedly and stably entering the main channel during the working period, namely, the optical detection assembly continuously and uninterruptedly detects the gas sample; when the through gas path channel is opened within the preset time, other gas path channels are closed, the gas sample is directly discharged through the through gas path channel, when the first detection assembly channel is opened within the preset time, other gas path channels are closed, the gas sample enters the first detection assembly along the main channel from the optical detection assembly, is analyzed and then is discharged, and the analyzed data are transmitted to the analysis control assembly.
In this technical solution, as described in the background of the invention in relation to the prior art, in the common gas path system, although the serial design of the β -ray detection module and the optical scattering module can ensure the consistency of the target gas samples measured by the β -ray detection module and the optical scattering module, since the β -ray detection module needs to move the paper tape to replace the enrichment point after the end of a sampling period, the air pump will stop working at this time, and the design of the common gas path will cause the measured data concentration of the optical scattering module to approach 0 during the period of stopping air pumping; the invention discloses a real-time particulate matter measuring method based on a beta-ray absorption/light scattering principle, which utilizes the gas path switching of a common path and a multi-way valve to ensure that an optical scattering module and a beta-ray detection module measure the same particulate matter sample, so the correction value is more accurate, the whole structure is more compact after the common gas path is adopted, simultaneously, an air pump continuously and uninterruptedly works to ensure that the data measured by the optical scattering module is continuous and effective, when the beta-ray detection module moves a paper tape to replace an enrichment point, the gas path is automatically switched, and air flow bypasses the beta-ray detection module after passing through the optical scattering module and is directly discharged through the air pump, thereby ensuring that the beta-ray detection module is not influenced by air suction when the paper tape is moved, and the beta-ray detection module can normally enter the next sampling period on the premise of not turning off the pump.
In addition, the real-time particulate matter measuring method based on the beta-ray absorption/light scattering principle disclosed by the invention has the following additional technical characteristics:
further, n is 2, the gas path control assembly comprises the through gas path channel, the first detection assembly channel is a beta ray detection assembly channel, and the first detection assembly is a beta ray detection assembly; the gas sample enters the gas path switching assembly from the optical detection assembly, the through gas path channel is closed and the beta ray detection assembly channel is opened under the preset condition, the gas sample enters the beta ray detection assembly for analysis, the analyzed data are transmitted to the analysis control assembly, the gas sample is discharged, the beta ray detection assembly channel is closed and the through gas path channel is opened under the preset condition, and the gas sample is directly discharged.
Furthermore, the gas sample enters the beta ray detection assembly, and when the collection paper tape is moved in the beta ray detection assembly to replace the enrichment point, the channel of the beta ray detection assembly is automatically switched to the through gas channel, so that the gas sample bypasses the beta ray detection module to be directly discharged.
Further, in the measuring method, an air pump is used for providing a power source, the air pump continuously and uninterruptedly pumps air in a working state, the gas sample continuously and uninterruptedly enters the optical detection assembly through the main channel for analysis, and the gas sample is ensured to be continuously and uninterruptedly discharged through the air pump in a gas circuit switching process under the control of the gas circuit switching assembly.
Further, the air path switching assembly comprises a multi-way valve, an inlet sleeve and n outlet sleeves, the inlet sleeve is connected with the main channel, the n outlet sleeves are connected with the n air path channels, the outlet sleeve at least comprises two air path channels, one of the two air path channels is the through air path channel, the other one of the two air path channels is the first detection assembly channel, the through air path channel is connected with the air pump, the first detection assembly channel is internally provided with the first detection assembly, and the air pump is connected behind the first detection assembly.
Furthermore, the multi-way valve is a three-way valve, the three-way valve comprises one inlet sleeve and 2 outlet sleeves, the inlet sleeve is connected with the main channel, one outlet sleeve is sequentially connected with the straight-through gas channel and the air pump, the other outlet sleeve is connected with the first detection assembly channel, the first detection assembly is a beta-ray detection assembly, and the air pump is connected behind the beta-ray detection assembly.
Furthermore, the connection between the outlet sleeve and the inlet sleeve and the multi-way valve is a quick plug connection.
Furthermore, the multi-way valve is a multi-way electromagnetic valve and is controlled by a multi-way valve control component directly connected with the multi-way valve.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a real-time measurement method according to an embodiment of the present invention;
FIG. 2 is a schematic view of a multi-way valve according to an embodiment of the present invention;
fig. 3 is a side view of fig. 2.
The detection device comprises a detection gas channel A, a direct gas channel B, an inlet sleeve 1, a multi-way valve 2, an outlet sleeve 3 and a multi-way valve control part 4.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar identifying elements or identifying elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
The invention has the following conception that the invention provides a particulate matter real-time measuring method based on the beta-ray absorption/light scattering principle, the common path and the air path switching of a multi-way valve are utilized, so that the optical scattering module and the beta-ray detection module measure the same particulate matter sample, the correction value is more accurate, the whole structure is more compact after the common air path is adopted, meanwhile, an air suction pump continuously and uninterruptedly works, the data measured by the optical scattering module are ensured to be continuous and effective, when the beta-ray detection module moves a paper tape to replace an enrichment point, the air path is automatically switched, air flow bypasses the beta-ray detection module after passing through the optical scattering module and is directly discharged through the air suction pump, the beta-ray detection module is ensured not to be influenced by air suction when the paper tape is moved, and the beta-ray detection module can normally enter the next sampling period on the premise of not turning off the pump.
The method for real-time measurement of particulate matter based on the β -ray absorption/light scattering principle according to the present invention will be described with reference to the accompanying drawings, in which fig. 1 is a schematic view of an embodiment of the real-time measurement method according to the present invention; FIG. 2 is a schematic view of a multi-way valve according to an embodiment of the present invention; fig. 3 is a side view of fig. 2.
According to the embodiment of the invention, as shown in fig. 1, the method comprises the steps that a gas sample containing a substance to be detected enters a main channel, the gas sample is subjected to heating and dehumidifying treatment by a heating and dehumidifying component, is analyzed by an optical detection component, and simultaneously transmits analysis data to an analysis control component, the gas sample enters a gas path control component, the gas path control component comprises n gas path channels, and gas path switching is carried out according to preset conditions, wherein the gas path channels at least comprise two gas path channels, one of the gas path channels is a straight gas path channel which directly discharges the gas sample flowing in, the other gas path channel is a first detection component channel, the gas sample enters the first detection component channel through the gas path control component and is discharged after entering the first detection component channel for analysis, and the gas path control component carries out gas path switching according to the preset conditions, meanwhile, the main channel keeps the gas sample continuously and stably entering the main channel during the working period, namely, the optical detection assembly is ensured to continuously and uninterruptedly detect the gas sample; when the through gas path channel is opened within the preset time, other gas path channels are closed, the gas sample is directly discharged through the through gas path channel, when the first detection assembly channel is opened within the preset time, other gas path channels are closed, the gas sample enters the first detection assembly along the main channel from the optical detection assembly, is analyzed and then is discharged, and the analyzed data are transmitted to the analysis control assembly.
According to some embodiments of the present invention, n is 2, the gas path control component includes the through gas path channel, the first detection component channel is a β -ray detection component channel, and the first detection component is a β -ray detection component; the gas sample enters the gas path switching assembly from the optical detection assembly, the through gas path channel is closed and the beta ray detection assembly channel is opened under the preset condition, the gas sample enters the beta ray detection assembly for analysis, the analyzed data are transmitted to the analysis control assembly, the gas sample is discharged, the beta ray detection assembly channel is closed and the through gas path channel is opened under the preset condition, and the gas sample is directly discharged.
Further, the gas sample enters the beta ray detection assembly, and when the collection paper tape is moved in the beta ray detection assembly to replace an enrichment point, the channel of the beta ray detection assembly is automatically switched to the through gas channel, so that the gas sample bypasses the beta ray detection module to be directly discharged.
According to some embodiments of the present invention, in the measuring method, an air pump is used to provide a power source, the air pump continuously and uninterruptedly pumps air in a working state, the gas sample continuously and uninterruptedly enters the optical detection assembly through the main channel to be analyzed, and the gas sample is ensured to be continuously and uninterruptedly discharged through the air pump in an air path switching process under the control of the air path switching assembly.
According to some embodiments of the present invention, the air path switching assembly includes a multi-way valve, an inlet sleeve and n outlet sleeves, the inlet sleeve is connected to the main channel, the n outlet sleeves are connected to the n air path channels, the outlet sleeve includes at least two air path channels, one of the two air path channels is the through air path channel, the other one of the two air path channels is the first detection assembly channel, the through air path channel is connected to the air pump, the first detection assembly channel is provided with the first detection assembly, and the air pump is connected to the rear of the first detection assembly.
Furthermore, the multi-way valve is a three-way valve, the three-way valve comprises one inlet sleeve and 2 outlet sleeves, the inlet sleeve is connected with the main channel, one outlet sleeve is sequentially connected with the straight-through gas channel and the air pump, the other outlet sleeve is connected with the first detection assembly channel, the first detection assembly is a beta-ray detection assembly, and the air pump is connected behind the beta-ray detection assembly.
According to some embodiments of the invention, the coupling of the outlet sleeve and the inlet sleeve to the multi-way valve is a quick connector coupling.
According to some embodiments of the invention, the multi-way valve is a multi-way solenoid valve.
While specific embodiments of the invention have been described in detail with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention. In particular, reasonable variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the foregoing disclosure, the drawings and the appended claims without departing from the spirit of the invention; except variations and modifications in the component parts and/or arrangements, the scope of which is defined by the appended claims and equivalents thereof.
Claims (8)
1. A real-time particulate matter measuring method based on a beta-ray absorption/light scattering principle is characterized by comprising the following steps: a gas sample containing a substance to be detected enters a main channel, is subjected to heating and dehumidifying treatment through a heating and dehumidifying assembly, is analyzed through an optical detection assembly, and simultaneously transmits analysis data to an analysis control assembly, the gas sample enters a gas circuit control assembly, the gas circuit control assembly comprises n gas circuit channels, and gas circuit switching is carried out according to preset conditions, wherein the gas circuit channels at least comprise two gas circuit channels, one of the two gas circuit channels is a through gas circuit channel which directly discharges the inflowing gas sample, the other gas circuit channel is a first detection assembly channel, the gas sample enters the first detection assembly channel through the gas circuit control assembly and is discharged after entering the first detection assembly for analysis, the gas circuit control assembly carries out gas circuit switching according to the preset conditions, and meanwhile, the main channel keeps the gas sample continuously and stably entering the main channel during the working period, namely, the optical detection assembly is ensured to continuously and uninterruptedly detect the gas sample; when the straight-through air channel is opened within the preset time, other air channels are closed, the gas sample is directly discharged through the straight-through air channel, when the first detection assembly channel is opened within the preset time, other air channels are closed, the gas sample enters the first detection assembly along the main channel from the optical detection assembly, is analyzed and then is discharged, analyzed data are transmitted to the analysis control assembly, the rear end of the first detection assembly is directly connected with the air pump, the straight-through air channel and the other air channels are directly connected with the air pump, and the air pump continuously works for 24 hours in the working period.
2. The method for measuring the particulate matter based on the beta-ray absorption/light scattering principle in real time according to claim 1, wherein n is 2, the gas path control assembly comprises the through gas path channel, the first detection assembly channel is a beta-ray detection assembly channel, and the first detection assembly is a beta-ray detection assembly; the gas sample enters the gas path switching assembly from the optical detection assembly, the through gas path channel is closed and the beta ray detection assembly channel is opened under the preset condition, the gas sample enters the beta ray detection assembly for analysis, the analyzed data are transmitted to the analysis control assembly, the gas sample is discharged, the beta ray detection assembly channel is closed and the through gas path channel is opened under the preset condition, and the gas sample is directly discharged.
3. The method for measuring the particulate matters based on the beta-ray absorption/light scattering principle in real time as claimed in claim 2, wherein the gas sample enters the beta-ray detection assembly, and when the collection paper tape is moved to change the enrichment point in the beta-ray detection assembly, the channel of the beta-ray detection assembly is automatically switched to the straight-through gas channel, so that the gas sample bypasses the beta-ray detection module to be directly discharged.
4. The method according to claim 1, wherein a suction pump is used to provide a power source, the suction pump continuously and uninterruptedly performs suction in a working state, the gas sample continuously and uninterruptedly enters the optical detection module through the main channel for analysis, and the gas sample is continuously and uninterruptedly discharged through the suction pump during gas path switching under control of the gas path switching module.
5. The method for measuring the particles based on the beta-ray absorption/light scattering principle according to claim 1, wherein the gas path switching assembly comprises a multi-way valve, an inlet sleeve and n outlet sleeves, the inlet sleeve is connected with the main channel, the n outlet sleeves are connected with the n gas path channels, the outlet sleeve at least comprises two gas path channels, one of the two gas path channels is the through gas path channel, the other gas path channel is the first detection assembly channel, the through gas path channel is connected with an air pump, the first detection assembly channel is provided with the first detection assembly, and the air pump is connected behind the first detection assembly channel.
6. The method according to claim 5, wherein the multi-way valve is a three-way valve, the three-way valve comprises one inlet sleeve and 2 outlet sleeves, the inlet sleeve is connected with the main channel, one outlet sleeve is sequentially connected with the through gas channel and the air pump, the other outlet sleeve is connected with the first detection assembly channel, the first detection assembly is a beta-ray detection assembly, and the air pump is connected behind the beta-ray detection assembly.
7. The real-time measurement method according to any one of claims 5 or 6, wherein the coupling of the outlet sleeve and the inlet sleeve to the multi-way valve is a quick connector coupling.
8. The real-time measurement method of claim 1, wherein the multi-way valve is a multi-way solenoid valve.
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| CN202111091872.XA CN113899665A (en) | 2021-09-17 | 2021-09-17 | Particulate matter real-time measuring method based on beta-ray absorption/light scattering principle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115372220A (en) * | 2022-10-26 | 2022-11-22 | 杭州泽天春来科技有限公司 | Particulate matter concentration detection device |
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| CN209640208U (en) * | 2019-02-15 | 2019-11-15 | 浙江华科检测技术有限公司 | A kind of sampling Graphite Furnace Atomic Absorption spectrophotometer |
| CN111141646A (en) * | 2019-11-15 | 2020-05-12 | 江苏天瑞仪器股份有限公司 | Real-time particulate matter measuring device based on β ray method and light scattering principle |
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- 2021-09-17 CN CN202111091872.XA patent/CN113899665A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104122180A (en) * | 2014-07-21 | 2014-10-29 | 青岛众瑞智能仪器有限公司 | Method for measuring mass concentration of particulate matter |
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| CN108645767A (en) * | 2018-05-02 | 2018-10-12 | 华中科技大学 | A method of coupling light scattering and beta-ray measurement coal-fired flue-gas particulate matter quality concentration |
| CN209640208U (en) * | 2019-02-15 | 2019-11-15 | 浙江华科检测技术有限公司 | A kind of sampling Graphite Furnace Atomic Absorption spectrophotometer |
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