CN108918321A - A kind of quality characterization method for dividing particles for cigarette smoke - Google Patents
A kind of quality characterization method for dividing particles for cigarette smoke Download PDFInfo
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- CN108918321A CN108918321A CN201810775566.XA CN201810775566A CN108918321A CN 108918321 A CN108918321 A CN 108918321A CN 201810775566 A CN201810775566 A CN 201810775566A CN 108918321 A CN108918321 A CN 108918321A
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- quartz crystal
- flue gas
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- 239000002245 particle Substances 0.000 title claims abstract description 117
- 239000000779 smoke Substances 0.000 title claims abstract description 48
- 235000019504 cigarettes Nutrition 0.000 title claims abstract description 27
- 238000012512 characterization method Methods 0.000 title claims abstract description 17
- 239000013078 crystal Substances 0.000 claims abstract description 53
- 239000010453 quartz Substances 0.000 claims abstract description 51
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 51
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000003546 flue gas Substances 0.000 claims abstract description 28
- 238000009826 distribution Methods 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000000443 aerosol Substances 0.000 claims description 24
- 239000010687 lubricating oil Substances 0.000 claims description 11
- 238000003380 quartz crystal microbalance Methods 0.000 claims description 10
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 6
- 239000010931 gold Substances 0.000 claims description 6
- 229910052737 gold Inorganic materials 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 claims description 2
- 238000000151 deposition Methods 0.000 claims description 2
- 238000003754 machining Methods 0.000 claims description 2
- 230000001131 transforming effect Effects 0.000 claims description 2
- 230000007246 mechanism Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000011160 research Methods 0.000 abstract description 2
- 238000007796 conventional method Methods 0.000 abstract 1
- 230000008021 deposition Effects 0.000 abstract 1
- 238000012545 processing Methods 0.000 abstract 1
- 230000035939 shock Effects 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 241000208125 Nicotiana Species 0.000 description 1
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000012372 quality testing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
-
- 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
- G01N15/02—Investigating particle size or size distribution
- G01N15/0272—Investigating particle size or size distribution with screening; with classification by filtering
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
A kind of quality characterization method for dividing particles for cigarette smoke, it is characterised in that：This method is first transformed the grain size grading impinger of electric low-pressure impact-type sampler, every level-one of grain size grading impinger is hit into disk center upper surface processing excision certain thickness, then piezoelectric type quartz-crystal body disc is placed in the shock disk upper surface, and is fixed by metal pressure ring；When cigarette smoke sample introduction measures, grain size grading impinger carries out classification collection to different-grain diameter flue gas, after collection, using the different-grain diameter flue gas particle quality of the piezoelectric effect test quartz crystal panel surface deposition of piezoelectric type quartz-crystal body disc, the quality characterization that flue gas divides particles is completed.Quality characterization method of the invention compared with the conventional method, improves the quality test precision of micro different-grain diameter flue gas particle, is conducive to Mass Distribution of the accurate characterization flue gas particle under different-grain diameter, can be used for the research of cigarette burning mechanism.
Description
Technical Field
The invention belongs to the technical field of cigarette smoke analysis and detection, and particularly relates to a quality characterization method for cigarette smoke particle size grading particles.
Background
In the combustion process of cigarettes, the tobacco components generate thousands of smoke components through complex processes such as combustion, pyrolysis, distillation and the like. Because of the larger temperature gradient in the flue gas combustion cone, flue gas components can be condensed into aerosol along with the reduction of the temperature. The mass distribution of the smoke aerosol under different particle sizes is researched, and the method has an important effect on researching the combustion process of the cigarette and disclosing the combustion mechanism. The particle size of the smoke aerosol is small, the average aerodynamic particle size of fresh smoke is usually within the range of 50-500 nm, and the particle number concentration is 1 multiplied by 109A cm3—1×1010Per cm3. The test result of the flue gas aerosol is closely related to the flue gas aging time, the dilution time and the multiple, and the instrument method.
The electric low-voltage impact sampler is an instrument for online measurement of aerosol, and has been reported to be used for online measurement of single-port smoke aerosol. The instrument mainly comprises: corona charger, cascade impact collision device, detector. The corona charger can make aerosol particles carry a certain amount of charges, the charged particles are introduced into the sampler and can be divided into 12 particle size ranges according to the aerodynamic diameter of the particles, the detector records the electric signals of each stage of impact disc, the particle number concentration of each stage of impact disc (corresponding to the particle size range) can be obtained, and the mass distribution condition of the smoke particles in different particle size ranges can be obtained according to the calculation of the aerodynamic diameter. However, this method has the following problems when used for the quality characterization of cigarette smoke particle size particles: (1) the electric low-voltage impact sampler cannot directly measure the quality of the aerosol, but is obtained by calculation according to theoretical values of electric signals of a detector, the effective density of the aerosol, the electric efficiency of an aerosol tape and the like, and the deviation of the actual values of the effective density and the electric efficiency in the process can influence the accurate representation of the mass distribution of the aerosol; (2) in the measuring process of the electric low-voltage impact type sampler, the aerosol generates particle rebounding and blowing phenomena when deposited on the surface of the impactor and is accompanied with the transfer of particle charges, so that the measured electric signal cannot reflect the particle number concentration of the aerosol, and the accurate representation of the aerosol mass distribution is also influenced; (3) the surface of the impactor of the electric low-voltage impact sampler is subjected to frosting treatment, the impactor is directly used for collecting the flue gas aerosol with different particle sizes, the collected flue gas is weighed, and the mass distribution of the aerosol in a part of particle size range can be obtained. However, the mass of the single-mouth smoke aerosol of the cigarette is small, the smoke particle size distribution is normal distribution, the number of aerosol particles in a small particle size area and a large particle size area is relatively small, the mass of the collected particles is small, and the particles cannot be accurately measured.
Disclosure of Invention
The invention aims at the requirement of quality characterization of the cigarette single-mouth smoke particle size distribution particles, and provides a quality characterization method for the cigarette smoke particle size distribution particles.
The purpose of the invention is realized by the following technical scheme:
a quality characterization method for cigarette smoke particle size particles comprises the steps of firstly, transforming a particle size grading collider of an electric low-voltage impact type sampler, machining and cutting off the upper surface of the center of each grade of an impact disc of the particle size grading collider by 0.1-0.2 mm, then placing a piezoelectric quartz crystal disc with the thickness of 0.1-0.2 mm on the upper surface of each grade of the impact disc, and fixing the piezoelectric quartz crystal disc through a metal compression ring; when the cigarette smoke is subjected to sample introduction measurement, the smoke with different particle sizes is collected in a grading manner by a particle size grading collider, and after the collection is finished, the quality of smoke particles with different particle sizes deposited on the surface of each level of piezoelectric quartz crystal plate is measured by a quartz crystal microbalance testing system, so that the quality characterization of the smoke particles with different particle sizes is completed; the method comprises the following specific steps:
1) coating a layer of lubricating oil on the surface of a piezoelectric quartz crystal disk with the thickness of 0.1-0.2 mm, and measuring the resonance frequency of the quartz crystal disk by a quartz crystal microbalance test system;
2) placing a piezoelectric quartz crystal disk on the upper surface of the center of each-stage impact disk of the particle size grading collider, and fixing the piezoelectric quartz crystal disk through a metal compression ring;
3) installing a particle size grading collider fixed with a quartz crystal disc on an electric low-voltage impact type sampler;
4) introducing cigarette smoke into an electric low-voltage impact type sampler, separating the smoke based on aerodynamic diameter, and depositing smoke particles with different particle sizes on quartz crystal discs of particle size grading colliders;
5) and placing the quartz crystal discs at all levels after the flue gas is collected in a quartz crystal microbalance testing system, respectively measuring the resonance frequency of each quartz crystal disc, and calculating the mass of deposited flue gas particles.
In the invention, a layer of lubricating oil is coated on the surface of the quartz crystal plate for adsorbing smoke particles, and the kinematic viscosity (40 ℃) of the lubricating oil is 5-15 mm2The thickness is 10 to 100 μm.
The diameter of the quartz crystal plate is 20-30 mm, the central electrode is a circular gold film, the diameter of the central electrode is 10-25 mm, and the thickness of the central electrode is 10-100 nm.
In step 5), iniIn the range of grade particle size, the quartz crystal microbalance test system calculates the mass of the flue gas particles collected on the surface of the quartz crystal plate according to the Sauerberry equation as follows:
wherein,Δm i (g) for collecting the mass of the flue gas particles;Δf(Hz) is the resonance frequency change before and after the quartz crystal plate deposits the smoke particles;A（cm2) Is the area of the gold electrode of the quartz crystal plate,f(Hz) is the resonance frequency of the quartz crystal plate.
The mass of the flue gas collected by each stage of quartz crystal trays of the particle size grading collider is calculated respectively, so that the mass distribution of the flue gas aerosol under different particle sizes, namely the mass distribution of the flue gas particles with different particle sizes can be obtained.
The method has the advantages that:
aiming at the requirement of quality characterization of cigarette smoke particle size distribution particles, a quality characterization method for the cigarette smoke particle size distribution particles is provided. The method can measure the smoke aerosol collected by different particle sizes respectively to obtain the mass distribution of the smoke particles with different particle sizes. Compared with the existing method, the quality characterization method provided by the invention improves the quality testing precision of trace smoke particles with different particle sizes, is beneficial to accurately characterizing the mass distribution of the smoke particles under different particle sizes, and can be used for the research of cigarette combustion mechanism.
Drawings
FIG. 1 is a particle size classifying collider provided with a quartz crystal plate according to the present invention;
in the figure: 1. quartz crystal disk, 2 metal pressure ring, 3 particle size grading collider, 4 impact disk.
Detailed Description
The invention will be illustrated below with reference to examples:
the diameter of the central circular area of each stage of the impact disc 4 of the particle size grading collider 3 adopted by the invention is 25.8mm, and the thickness is 5 mm; the central upper surface of the impact disc 4 is machined off by a thickness of 0.2 mm.
The piezoelectric quartz crystal disk 1 for flue gas aerosol collection is customized, the diameter of the quartz crystal disk 1 is 25.8mm, the thickness is 0.2mm, and the electrocardioelectrode is a circular gold film, the diameter is 20mm, and the thickness is 20 nm.
Coating lubricating oil on the surface of the quartz crystal disc 1, wherein the coating thickness is about 25-50 mu m, and the kinematic viscosity (40 ℃) of the selected lubricating oil is 10 mm2/s。
The quartz crystal plate 1 coated with the lubricating oil was placed in a quartz crystal microbalance test system, and the resonance frequency thereof was measured.
The quartz crystal plate 1 coated with the lubricating oil is placed on the central upper surface of the impact plate 4 of the impactor 3 and is fixed by the metal press ring 2. Then, the particle size classifying collider 3 was installed to the electric low-voltage impact type sampler.
The single cigarette is sucked, cigarette smoke is sucked to a sample inlet under the action of negative pressure (100 mPa) of an electric low-pressure impact sampler, aerosol particles collide to a grading collider 3 with different particle sizes under the action of inertia based on aerodynamic diameter, and are trapped by a quartz crystal disc 1 coated with lubricating oil.
After the single cigarette is sucked, putting the quartz crystal discs 1 with different particle size grades in a quartz crystal microbalance testing system, and measuring the resonance frequency of the quartz crystal discs 1. In the first placeiIn the range of grade particle size, the mass of the flue gas particles collected on the surface of the quartz crystal disc 1 is as follows:
wherein, Deltam i (g) For collecting the mass of the flue gas particles; deltaf(Hz) is the frequency variation of the quartz crystal plate;A（cm2) Is the area of the gold electrode of the quartz crystal plate,f(Hz) is the test frequency of the quartz crystal plate.
The mass of the smoke aerosol in different particle size ranges is respectively calculated, and the mass distribution of the single cigarette smoke particle size particles can be obtained.
The quality of the particle size of the single-mouth smoke measured by the method is shown in the following table 1.
TABLE 1 quality results of particle size distribution of single cigarette smoke
| Number of particle size segment | Median particle diameter nm | Mass of μ g |
| 1 | 26.8 | 36 |
| 2 | 38.7 | 45 |
| 3 | 70 | 51 |
| 4 | 144 | 66 |
| 5 | 261 | 114 |
| 6 | 431 | 198 |
| 7 | 722 | 72 |
| 8 | 1166 | 51 |
| 9 | 1851 | 49 |
| 10 | 2927 | 46 |
| 11 | 5959 | 44 |
| 12 | 9388 | 36 |
Claims (4)
1. A quality characterization method for cigarette smoke particle size particles is characterized by comprising the following steps: the method comprises the steps of firstly, transforming a particle size grading collider of an electric low-voltage impact type sampler, machining and cutting off the upper surface of the center of each grade of an impact disc of the particle size grading collider by 0.1-0.2 mm, then placing a piezoelectric quartz crystal disc with the thickness of 0.1-0.2 mm on the upper surface of each grade of the impact disc, and fixing the piezoelectric quartz crystal disc through a metal compression ring; when the cigarette smoke is subjected to sample introduction measurement, the smoke with different particle sizes is collected in a grading manner by a particle size grading collider, and after the collection is finished, the quality of smoke particles with different particle sizes deposited on the surface of each level of piezoelectric quartz crystal plate is measured by a quartz crystal microbalance testing system, so that the quality characterization of the smoke particles with different particle sizes is completed; the method comprises the following specific steps:
1) coating a layer of lubricating oil on the surface of a piezoelectric quartz crystal disk with the thickness of 0.1-0.2 mm, and measuring the resonance frequency of the quartz crystal disk by a quartz crystal microbalance test system;
2) placing a piezoelectric quartz crystal disk on the upper surface of the center of each-stage impact disk of the particle size grading collider, and fixing the piezoelectric quartz crystal disk through a metal compression ring;
3) installing a particle size grading collider fixed with a quartz crystal disc on an electric low-voltage impact type sampler;
4) introducing cigarette smoke into an electric low-voltage impact type sampler, separating the smoke based on aerodynamic diameter, and depositing smoke particles with different particle sizes on quartz crystal discs of particle size grading colliders;
5) and placing the quartz crystal discs at all levels after the flue gas is collected in a quartz crystal microbalance testing system, respectively measuring the resonance frequency of each quartz crystal disc, and calculating the mass of deposited flue gas particles.
2. The method of claim 1, wherein: the surface of the quartz crystal plate is coated with a layer of lubricating oil for adsorbing smoke particles, and the kinematic viscosity (40 ℃) of the lubricating oil is 5-15 mm2The thickness is 10 to 100 μm.
3. The method of claim 1, wherein: the diameter of the quartz crystal plate is 20-30 mm, the central electrode is a circular gold film, the diameter of the central electrode is 10-25 mm, and the thickness of the central electrode is 10-100 nm.
4. The method of claim 1, wherein: in step 5), iniIn the range of grade particle size, the quartz crystal microbalance test system calculates the mass of the flue gas particles collected on the surface of the quartz crystal plate according to the Sauerberry equation as follows:
wherein,Δm i (g) for collecting the mass of the flue gas particles;Δf(Hz) is the resonance frequency change before and after the quartz crystal plate deposits the smoke particles;A（cm2) Is the area of the gold electrode of the quartz crystal plate,f(Hz) is the resonance frequency of the quartz crystal plate;
the mass of the flue gas collected by each stage of quartz crystal trays of the particle size grading collider is calculated respectively, so that the mass distribution of the flue gas aerosol under different particle sizes, namely the mass distribution of the flue gas particles with different particle sizes can be obtained.
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| CN201810775566.XA CN108918321A (en) | 2018-07-16 | 2018-07-16 | A kind of quality characterization method for dividing particles for cigarette smoke |
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| CN201810775566.XA CN108918321A (en) | 2018-07-16 | 2018-07-16 | A kind of quality characterization method for dividing particles for cigarette smoke |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3715911A (en) * | 1970-05-11 | 1973-02-13 | Susquehanna Corp | Apparatus for sensing air-borne particulate matter |
| WO2007062818A1 (en) * | 2005-11-29 | 2007-06-07 | Georg-August-Universität Göttingen | Impactor, in particular for measuring fine dust |
| CN103257095A (en) * | 2013-05-14 | 2013-08-21 | 中国环境科学研究院 | Grading test method and device of fine particulate matters in emission source |
| CN203275248U (en) * | 2013-06-14 | 2013-11-06 | 武汉市林海仪器设备工程有限公司 | Impact type dust particle grading instrument for flue |
| DE202013011702U1 (en) * | 2013-01-24 | 2014-03-14 | Testo Ag | impactor |
| CN103674793A (en) * | 2012-09-21 | 2014-03-26 | Msp公司 | Apparatus and method for particle sampling and measurement in the ambient air |
-
2018
- 2018-07-16 CN CN201810775566.XA patent/CN108918321A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3715911A (en) * | 1970-05-11 | 1973-02-13 | Susquehanna Corp | Apparatus for sensing air-borne particulate matter |
| WO2007062818A1 (en) * | 2005-11-29 | 2007-06-07 | Georg-August-Universität Göttingen | Impactor, in particular for measuring fine dust |
| CN103674793A (en) * | 2012-09-21 | 2014-03-26 | Msp公司 | Apparatus and method for particle sampling and measurement in the ambient air |
| DE202013011702U1 (en) * | 2013-01-24 | 2014-03-14 | Testo Ag | impactor |
| CN103257095A (en) * | 2013-05-14 | 2013-08-21 | 中国环境科学研究院 | Grading test method and device of fine particulate matters in emission source |
| CN203275248U (en) * | 2013-06-14 | 2013-11-06 | 武汉市林海仪器设备工程有限公司 | Impact type dust particle grading instrument for flue |
Non-Patent Citations (1)
| Title |
|---|
| 孙萍 等: "《质量敏感型有毒有害气体传感器及阵列研究》", 28 February 2015, 电子科技大学出版社 * |
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Application publication date: 20181130 |