System and method for producing high-time diluted PM2.5 aerosol

Abstract

The invention discloses a system and a method for producing high-time diluted PM2.5 aerosol. The system is characterized in that a vibration sieve feeding machine, an aerosol dust raiser, a first-stage diluter, an aerosol buffer tank, a second-stage diluter, a PM2.5 separator, a draft fan and an aerosol buffer tank are sequentially connected together; the aerosol buffer tank, a return material airflow control valve, a return material airflow meter, the aerosol buffer tank and the second-stage diluter are sequentially connected together; the aerosol dust raiser, the first-stage diluter and the bottommost vibration sieve stage of the vibration sieve feeding machine are sequentially connected together; compressed air provided by an air compressor is divided into two paths, one path is connected with the aerosol buffer tank and the second-stage diluter after sequentially passing through a compressed air supplement control valve and a flow meter of the second-stage diluter, and the other path is connected with the aerosol dust raiser and the first-stage diluter after sequentially passing through a jet flow pressure control valve and a pressure gauge of the first-stage diluter. Due to adoption of the system, high-time diluted PM2.5 aerosol with low concentration can be automatically, continuously and stably produced, and the size of an aerosol grain when being cut is precise.

Description

technical field [0001] The invention relates to an aerosol particle generating system, in particular to a highly diluted PM 2.5 Aerosol generating system and method thereof. Background technique [0002] The aerosol particle generation system can not only be used for the study of the physical and chemical properties of particles, the charging mechanism of particles, and the mechanism of condensation and removal of particles, but also plays an important role in the research of simulating the atmospheric environment and simulating the flue gas environment of power plants, especially in the flow field It has great application prospects in simulation and optical detection. At present, the aerosol particle generation system is mainly divided into two types of technology, one uses combustion to directly generate particles, and the other uses collected dust particles as a particle source for particle dusting. [0003] In the technology of using combustion to directly generate par...

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Problems solved by technology

Among them, the screw feeding system and the vibrating feeding system make the particles enter the pipeline to form aerosol through the screw rotation and vibration respectively, and the negative pressure suction injection system directly sucks the particles into the pipeline by forming a negative pressure state. Form aerosols, all three can form stable aerosols to a certain extent, the disadvantage is the lack of selectivity for particle size, and cannot form aerosols with specific particle size and specific concentration requirements (high dilution)

The fluidized bed feeding system is to blow a certain flow of gas at the bottom of the bed, and through the action of air force and the gravity of the particles themselves, the particles will keep rolling up and down, and finally the particles with smaller mass will escape to form aerosol. This technology In theory, it is selective to particles, but in actual operation, the input gas flow cannot be well controlled, and it is easy to cause the escape of large particles

The water vapor evaporation carrying technology is to soak the particles in the liquid phase, heat the liquid phase so that the liquid phase carries part of the particles during the evaporation process, and then dry the liquid phase in the later stage to obtain the dry particle state. This technology can obtain particle However, it is easy to destroy the original physical and chemical properties of the particles during the process of particle infiltration and the process of drying the liquid phase in the later stage

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