Development of performance test system for virtual impactor of respirable dust

IF 2.3 3区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Granular Matter Pub Date : 2024-01-23 DOI:10.1007/s10035-023-01392-1

Lifeng Hui

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Abstract

This work introduces a polydisperse aerosol testing system for respirable dust virtual impactor evaluation for the first time, and characterizes its performance. The aerosol in the dust chamber diluted and mixed completely, its diameter distribution follows a lognormal distribution. Although the aerosol concentration increased from top to bottom in the chamber, the particle distribution in the same measurement plane was relatively uniform. The sample flow rate of the test system is stable, and the change of temperature on the flow rate is negligible. The most common virtual impactor with the operating point flow rate of 4 L/min was selected as the subject, and its separation performance, flow variation and load characteristics were evaluated by this test system. The results show that the cutoff diameter deviation is − 2.8% and the maximum deviation from the BMRC curve is − 4.85%. The deviation in the cut-off diameter was more likely to be caused by the minor flow rate than that of a major flow rate. With an increase in the loading time and dust concentration, the virtual impactor was overloaded, which required maintenance according to its actual usage.

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开发可吸入粉尘虚拟冲击器性能测试系统

这项工作首次引入了用于可吸入粉尘虚拟冲击器评估的多分散气溶胶测试系统，并对其性能进行了描述。气溶胶在粉尘室中完全稀释和混合，其直径分布遵循对数正态分布。虽然气溶胶浓度在除尘室内从上到下逐渐增加，但在同一测量平面内的颗粒分布相对均匀。测试系统的样品流速稳定，温度变化对流速的影响可以忽略不计。选择工作点流速为 4 L/min 的最常见虚拟冲击器作为试验对象，通过该试验系统对其分离性能、流量变化和负载特性进行了评估。结果表明，截流直径偏差为 -2.8%，与 BMRC 曲线的最大偏差为 -4.85%。与大流量相比，小流量更容易造成截留直径偏差。随着装载时间和粉尘浓度的增加，虚拟反击式破碎机出现了超载现象，需要根据实际使用情况进行维护。

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来源期刊

Granular Matter Materials Science-General Materials Science

CiteScore

4.60

自引率

8.30%

发文量

审稿时长

6 months

期刊介绍： Although many phenomena observed in granular materials are still not yet fully understood, important contributions have been made to further our understanding using modern tools from statistical mechanics, micro-mechanics, and computational science. These modern tools apply to disordered systems, phase transitions, instabilities or intermittent behavior and the performance of discrete particle simulations. >> Until now, however, many of these results were only to be found scattered throughout the literature. Physicists are often unaware of the theories and results published by engineers or other fields - and vice versa. The journal Granular Matter thus serves as an interdisciplinary platform of communication among researchers of various disciplines who are involved in the basic research on granular media. It helps to establish a common language and gather articles under one single roof that up to now have been spread over many journals in a variety of fields. Notwithstanding, highly applied or technical work is beyond the scope of this journal.