A continuous jet dispersion method for micron and nanometer dry powder particles

Abstract

The invention relates to a continuous spray dispersion method of micro / nano dry powder particles. In the continuous spray dispersion method, a vacuum generator is in charge of spray dispersion of the particles; a precision doser is used for precisely controlling the feeding rate; a pressure balancing unit is used for ensuring that the doser can precisely and quantitatively feed a material in an environment with relatively stable pressure; a rotating central shaft of a valve core in the pressure balancing unit is connected with a speed reducing motor through a shaft coupler, the speed reducing motor drives the valve core of the pressure balancing unit, and through regulation of the rotation speed of the motor, different feeding rates and transfer of particles of different materials can be met; after the dry powder particles conveyed by the pressure balancing unit is mixed with purity supplementing gas in a material receiver, the dry powder particles are sucked into the vacuum generator for the spray dispersion under the action of negative pressure at a vacuum end. The continuous spray dispersion method has relatively high applicability; the total concentration of the dispersed particles can be regulated only by regulating the rotation speed of the motor of the doser, and further the rotation speed of a distributor is changed, so that spray dispersion control is very convenient and quick.

Description

Technical field [0001] The invention belongs to the technical fields of aerosol technology, particle technology and multiphase flow experiments, and relates to a continuous spray dispersion method of dry powder particles. Background technique [0002] The two-phase flow of micron and nano-particles is a common phenomenon in nature, and has been widely used in many fields such as atmospheric environmental science, modern nanomaterial preparation, engineering thermophysics, chemical synthesis, inhalation toxicology and medical pharmacy. It is the current research in fluid mechanics Hot spot. As the discrete phase of gas-solid two-phase flow, particles are often required to be in a dispersed state when applied in these fields, such as simulating atmospheric pollutants-haze, multiphase jet synthesis of new nano materials, (high temperature) spraying nano coatings, thermal power generation systems Combustion of pulverized coal in a medium fluidized bed, long-term toxicology experimen...

AI Technical Summary

Problems solved by technology

[0004] At present, there are many representative dust generators on the market that actually belong to the "dry" particle dispersion technology, but these particle dispersion equipment have two shortcomings: (1) Most dust generators are for micron-sized particles Developed by dispersion, it is not suitable for nanoparticle dispersion. Due to the influence of particle size, nanoparticle dispersion is more difficult; (2) mainstream dust generators are relatively expensive, and at the same time, a considerable part of the dispersed particle distribution is multimodal distribution, rather than a quasi-lognormal distribution that is unimodal and has a small deviation from the geometric mean

[0005] Recent related research has proved that it is feasible to disperse micron and nano-particles using cheap vacuum generators, but this new method can only last for a few seconds each time, and cannot achieve continuous jet dispersion of particles and precise control of particle concentration

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