Method for detecting cigarette smoke aerosol particle size distribution

Abstract

The invention discloses a method for detecting cigarette smoke aerosol particle size distribution, comprising a smoking machine (1), a diluter (2), an aerosol particle size spectrometer (3) and a temperature regulator (4); wherein, the smoking machine (1) is communicated with the diluter (2) through an electromagnetic valve (9) by a metallic conduit (8), the other end of the diluter (2) is communicated with the aerosol particle size spectrometer (3) by the metallic conduit (8), and the diluter (2) is provided with a waste gas outlet G; a heater (5) is communicated between the smoking machine (1) and the diluter (2) as well as between the diluter (2) and the aerosol particle size spectrometer (3) by the metallic conduit (8), and the heater (5) is controlled by the temperature regulator (4) and is sequentially communicated with an electronic flowmeter (6) and a filter (7). The method ensures the collected smoke gas aerosol sample to be in accordance with burning suction requirement of cigarette samples and leads the concentration of sample gas entering the aerosol particle size spectrometer to be within the valid detection range; when in real-time cigarette smoke detection, a technology of heating part of connecting pipelines is adopted, so that the loss of cigarette smoke aerosol particles can be reduced in the transmission process.

Description

technical field [0001] The invention belongs to the technical field of analysis and detection, and in particular relates to an analysis and detection method for detecting the particle size distribution of cigarette smoke aerosol. Background technique [0002] In the prior art, when the aerosol particle size spectrometer is used to measure the distribution of the aerosol particle size in the cigarette sample smoke, it is mainly connected through the smoking machine, the diluter and the particle size spectrometer, because the gas in the cigarette smoke The concentration of the sol is far greater than the concentration in the air. The concentration of the diluted gas in the diluter cannot meet the requirements of the particle size spectrometer for detection, which may easily cause serious overload of the aerosol particle size spectrometer during suction. There is no difference in the value, the test results are all the maximum value or exceed the detection limit of the instrume...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, when the aerosol particle size spectrometer is used to measure the distribution of the aerosol particle size in the cigarette sample smoke, it is mainly connected through the smoking machine, the diluter and the particle size spectrometer, because the gas in the cigarette smoke The concentration of the sol is far greater than the concentration in the air. The concentration of the diluted gas in the diluter cannot meet the requirements of the particle size spectrometer for detection, which may easily cause serious overload of the aerosol particle size spectrometer during suction. There is no difference in the value, the test results are all the maximum value or exceed the detection limit of the instrument, etc., so that the normal detection and analysis cannot be performed

Moreover, during the process of cigarette smoke flowing through the gas pipeline, the smoke is likely to condense on the pipe wall and attach to the wall of the gas transmission pipe, resulting in the loss of the smoke in the process of dilution and transportation, affecting the quality of the smoke. The accuracy of sol particle size analysis and detection leads to large errors in the analysis and detection results

In addition, if the gas concentration of the input flue gas sample is too high, the tar in the flue gas will easily stick to the aerosol detection instrument, which will easily cause the instrument to be blocked, the internal pressure is too high, the flow rate is unstable, and cleaning is difficult, etc.

Therefore, in the existing cigarette smoke aerosol analysis and detection technology, there is a lack of a stable, adjustable gas concentration, temperature and flow rate, and an analysis and detection method that can detect fresh smoke in real time, so that the existing aerosol The detection technology cannot detect the aerosol particle size distribution in cigarette smoke in real time, accurately and easily

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