System and method for detecting filter material counting efficiency based on monodispersed aerosol

Abstract

The invention discloses a system and a method for detecting filter material counting efficiency based on monodispersed aerosol. The system comprises a monodispersed aerosol generator and a mixing box that are respectively set and communicated; the monodispersed aerosol generator is sequentially communicated with a first valve, an aerosol generating flowmeter, a first filter and a first high pressure air source; the mixing box is sequentially communicated with a second valve, a dilution flowmeter, a second filter and a second high pressure air source, and is also communicated with a third valve and a third filter in sequence; the side wall of the mixing box is fixedly connected with a hygrothermograph one end of which extends into the mixing box; the mixing box is respectively communicated with an inlet of a filter material clamp and a fourth valve; an outlet of the filter material clamp is respectively communicated with a fifth valve and a filtering flowmeter; the fourth valve and the fifth valve are respectively communicated with a particle counter; sub-micron liquid monodispersed aerosol passes through the filter material, number concentration of the aerosol is measured before and after passing through the filter material, so that the filtering efficiency of the filter material is obtained. The system of the invention has good stability, high precision and can satisfy the requirements of detecting the efficiency of the filter material.

Description

technical field [0001] The invention relates to a filter material counting efficiency detection system based on a quasi-monodisperse aerosol, and also relates to a method for detecting the filter material counting efficiency by using the detection system, and the counting and filtering efficiency of the high-efficiency filter material can reach 99.99999%. Background technique [0002] With the wide application of high-efficiency filter materials in various fields, the requirements for the filtration effect of high-efficiency filter materials are also getting higher and higher. Correspondingly, more stringent detection methods have been proposed for the detection standards of high-efficiency filter materials. Efficiency is developed to detect the counting efficiency of aerosols with different particle sizes at different flow rates. The detection methods of high-efficiency filter materials used in domestic standards are sodium flame method and oil mist method, both of which me...

AI Technical Summary

Problems solved by technology

[0005] The existing detection systems used in counting filter material detection methods include: 1) The detection system using laser particle counters has high maintenance costs and low measurable concentrations. At the same time, the aerosol needs to be diluted by a diluter before sampling detection , and the accuracy of the diluter is difficult to meet the requirements, resulting in test errors; 2) a detection system using a differential mobility particle size classifier and a condensation nuclei particle counter, which needs to classify and detect aerosols of different particle sizes, The detection cycle is long, which cannot meet the needs of industrial production, and the equipment needs to use Kr 85 Radioactive source, there are certain restrictions on domestic use

Images