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Method for detecting cigarette gas colloidal sol grain fineness distribution

A particle size distribution and cigarette smoke technology, which is applied in the detection of aerosol particle distribution of different particle sizes in cigarette smoke, and the detection field of cigarette smoke aerosol particle size distribution, can solve the problem of inconsistent sample conditions, detection results exceeding, satisfying It can achieve the effect of controlling the quality of cigarettes and the effect is remarkable

Active Publication Date: 2009-02-25
CHINA TOBACCO GUANGDONG IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the existing aerosol detector is used to measure cigarette smoke, because the concentration of aerosol in the smoke is much higher than that in the air, the detector is seriously overloaded
The detection result exceeds the detection limit of the instrument (4.0×10 5 fA), there is no difference between the detected values, and all of them have reached the maximum value, etc., and the detection and analysis cannot be carried out.
Even if the sample dilution device provided by the aerosol detector manufacturer is used, the sample with high tar content still cannot meet the requirements and cannot be tested and analyzed; for the aerosol detection of low-tar cigarette samples, the pipeline is often blocked, and the pipeline The pressure drop is getting bigger and bigger, and the gas flow rate changes drastically during the cigarette smoking process, resulting in inconsistencies in the captured samples before and after.

Method used

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  • Method for detecting cigarette gas colloidal sol grain fineness distribution
  • Method for detecting cigarette gas colloidal sol grain fineness distribution
  • Method for detecting cigarette gas colloidal sol grain fineness distribution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Select cigarette samples to produce smoke through the smoking machine, and use the existing aerosol detector to directly measure the aerosol content of the cigarette smoke flowing out of the smoking machine. The suction source device of the detector itself usually has a stable flow rate of 10L / min ~40L / min, the gas sample is sucked outward, but because the aerosol concentration in the flue gas is much higher than that in the air, the detector is seriously overloaded. The detection result exceeds the detection limit of the instrument (4.0×10 5 fA), there was no difference between the detected values, and all reached the maximum value, etc., the results are as attached figure 1 As shown, the detection analysis cannot be performed.

[0037] If the axial diluter provided by the manufacturer of the aerosol detector is used to dilute the cigarette smoke and then carry out aerosol detection, the pipeline is still often blocked, the pressure drop of the pipeline is getting lar...

Embodiment 2

[0039] (1) The cigarette sample passes through the smoke generating device to generate a smoke sample stream 1;

[0040] As shown in Figure 3, the smoke generating device includes a smoking machine and a solenoid valve. The smoking machine can be used to suck cigarettes to generate cigarette smoke. The setting is usually 2 seconds on and 58 seconds off, and it is repeated until the cigarette is smoked.

[0041] (2) Adjust the gas flow rate of sample flow 1 to 1mL / min-1.8mL / min, and perform the first stage dilution;

[0042] The gas flow rate of the sample stream 1 is adjusted to a range of 1 mL / min to 1.8 mL / min by means of auxiliary gas dilution. The clean compressed air enters the axial diluter after the flow rate is adjusted by the pressure regulating valve. The cigarette sample passes through the smoke generating device to generate the smoke sample flow 1 and enters the axial diluter. The two are mixed, and the flow rate of the clean compressed air is adjusted by the pres...

Embodiment 3

[0049] Step (1) is with embodiment 2.

[0050] (2) Adjust the gas flow rate of sample flow 1 to 1mL / min-1.8mL / min, and perform the first stage dilution;

[0051] The external suction source is connected with the gas mixing diluter. The external suction source adopts a device with a stable flow rate control function, and the working efficiency is required to reach 20mL / min~40mL / min, which ensures that the concentration of the gas sample stream 2 after the first stage dilution is 10 to 40 times higher than that of the sample stream 1. . The dilution ratio is determined by the efficiency of the suction source and the requirements of cigarette testing. For example, if the efficiency of the suction source is 20mL / min, and the gas flow rate sample flow 1 required for cigarette testing is 1mL / min, the dilution ratio is slightly greater than 20:1. In the range of 20:1 ~ 28:1.

[0052] The sample flow 1 enters the gas mixing diluter, and the clean compressed air is used as the auxil...

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Abstract

The invention discloses a detection method for cigarette smoke gas aerosol grain fineness distribution, which comprises the following steps: a smoke gas sample is created out of a cigarette sample by a smoke gas generator; a method of auxiliary gas dilution is adopted to adapt the air velocity of the smoke gas sample to meet the specified cigarette suction requirements and dilute the smoke gas sample before the concentration of the sample falls in the valid detection range for an aerosol detecting instrument; the air velocity of the smoke gas sample flowing into the aerosol detecting instrument is adapted to meet the designated requirements of an aerosol analyzer; and the grain fineness distribution of the aerosol is detected. The invention ensures that the cigarette lighting and suction conform to the requirements during the collection of the smoke gas aerosol sample by improving the design of gas circuit connection between a smoke absorption machine and an aerosol detecting instrument and adopting approaches such as using an additional auxiliary gas and an external suction source exhausting device to adapt the air velocity to standard, etc., so that the prior aerosol detecting instrument can be utilized for the cigarette smoke gas aerosol detection.

Description

technical field [0001] The invention belongs to the technical field of aerosol detection, and in particular relates to a method for detecting the distribution of aerosol particles with different particle sizes in cigarette smoke, that is, a method for detecting the particle size distribution of aerosol in cigarette smoke. Background technique [0002] In the prior art, the process of measuring the particle size distribution of the aerosol in the air by the aerosol detector is as follows: through the suction source device of the detector itself, the gas sample is sucked outward at a steady flow rate of 10L / min-40L / min; When the sample concentration is high, an axial diluter can also be connected to dilute the sample. [0003] When the existing aerosol detector is used to measure cigarette smoke, the detector is seriously overloaded because the concentration of aerosol in the smoke is much higher than that in the air. The detection result exceeds the detection limit of the in...

Claims

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Application Information

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IPC IPC(8): G01N15/02
Inventor 孔浩辉
Owner CHINA TOBACCO GUANGDONG IND
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