Particle size grading acquisition method of cigarette mainstream smoke aerosol

Abstract

The invention discloses a particle size grading acquisition method of cigarette mainstream smoke aerosol, comprising the following steps of: (1) allowing cigarette to generate mainstream smoke aerosol on a smoke generating device; (2) allowing particle-free clean air to passively enter into a gas flow balancer in a continuous and main-road mode, and simultaneously allowing the mainstream smoke aerosol to actively enter the gas flow balancer in an interval and by-pass mode; (3) allowing the clean air or a gas mixture of the clean air and the mainstream smoke aerosol to passively enter into an aerosol multistage sampler at constant airflow velocity; (4) arranging an airflow velocity control system, which is used to set corresponding airflow velocity according to the working index of the sampler, inside the aerosol multistage sampler; (5) allowing the mainstream smoke aerosol to gather in the aerosol multistage sampler according to the particle size interval grading. According to the invention, two technical obstacles by the combination of an automatic smoking machine and the aerosol multistage sampler are overcome: one is gas flow difference; and the other is the difference between continuous flow and intermittent flow. The method provided by the invention can be used to realize grading acquisition of mainstream smoke by the aerosol multistage sampler.

Description

Technical field [0001] The invention belongs to the field of aerosol collection and analysis, and specifically relates to a method for separately collecting aerosol particles of different particle sizes in mainstream smoke according to a set particle size interval, that is, aerosol particles of cigarette mainstream smoke. Diameter grading collection method. Background technique [0002] The existing automatic smoking machine can only collect the total particulate matter of the mainstream cigarette smoke. The core of the existing aerosol grading sampling technology is particle inertial impact, and the main equipment is the Anderson eight-stage sampler and MODIS. The basic principle is: the sampler is composed of a pre-separator and multiple sampling plates stacked. When the particle-containing gas is ejected from the nozzle at a certain speed, the larger the particle size, the greater the inertia. Large particles with greater inertia collide with the trap plate and are deposited...

AI Technical Summary

Problems solved by technology

The simulated smoking of cigarettes has the characteristics of small flow rate and intermittent operation, so the aerosol fractional sampling technology cannot be directly applied to the fractional collection of cigarette mainstream smoke aerosols

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