Study on safe air transporting velocity of nanograde aluminum,iron, and titanium |
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| Authors: | Hong-Chun Wu Yung-Chih Kuo Yuan-heng Wang Chia-Wei Wu Hsiao-Chi Hsiao |
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| Institution: | 1. Institute of Occupational Safety and Health, Council of Labor Affairs, Executive Yuan, No. 99, Lane 407, Hengke Road, Sijhih City, Taipei 22143, Taiwan, ROC;2. Department of Chemical Engineering, National Chung Cheng University, No. 168, University Road, Minhsiung Township, Chiayi County 62102, Taiwan, ROC;3. Department of Occupational Safety and Health, Jen-Tec Junior College of Medicine, Nursing, and Management, No. 79-9, Xi-Zhou Li, Hou-Loung Town, Miaoli County 35664, Taiwan, ROC;1. Voronezh State University, Universitetskaya pl., 1, 394006 Voronezh, Russia;2. Ioffe Physical and Technical Institute, Polytekhnicheskaya, 26, 194021 St-Petersburg, Russia;1. Japan National Institute of Occupational Safety and Health, 1-4-6 Umezono, Kiyose, Tokyo 204-0024, Japan;2. Konkuk University, 120 Neungdong-ro, Gwangin-gu, Seoul 143-701, Republic of Korea;3. Technology Institution of Industrial Safety, 2-16-26 Hirosedai, Sayama-shi, Saitama 350-1328, Japan |
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| Abstract: | The process of delivering nanograde metal powders by a high-speed carrier gas is often subject to high explosion risks. This study adopted initial flow rates of 13.1, 8.5, 6.5, and 3.5 m/s for air transporting 30-nm titanium powder, 35-nm iron powder, and 35-nm aluminum powder to gauge the impact on a pipe bend in a 20-l-apparatus. The test results revealed that the 30-nm titanium powder caused an explosion at all initial flow rates; the 35-nm iron powder also caused an explosion, but dust explosion and sintering were eliminated when the flow rate was adjusted to less than 3.5 m/s; and the 35-nm aluminum powder exhibited no explosion or sintering at all flow rates. When pure nitrogen was used for transporting nanograde metal powders, no explosions occurred for all the three types of metal powders. The minimum ignition energy for these three types of nanograde metal powders was less than 1 mJ. |
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