Control of electrostatic charge for powder by using feedback control-type ionizer system |
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| Authors: | Tomofumi Mogami Teruo Suzuki Kwang Seok Choi Takashi Ikehata |
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| Institution: | 1. Ibaraki University, 4-12-1 Nakanarusawa, Hitachi, Ibaraki, Japan;2. Kasuga Denki, Inc., 2-16-18 Higashi-Kamata Ohta-ku, Tokyo, Japan;3. National Institute of Occupation Safety and Health, 1-4-6 Umezono Kiyose, Tokyo, Japan;1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China;2. National Institute of Occupational Safety and Health, Japan, Tokyo, Japan;1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China;2. Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou 450001, China |
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| Abstract: | As a method to prevent or mitigate cone discharges in a specific section such as a large silo, we have developed a new feedback control-type ionizer system. The feedback control-type system is composed mainly of an ionizer, an electrostatic field strength meter, and computer control equipment. In this study, we evaluated experimentally the practical version of the feedback control-type ionizer system through several tests in a pneumatic powder transport facility. The specific charges of the falling pellets in the silo were also measured for 10 s using a Faraday cage. Polypropylene (PP) pellets with a mean particle size of 3 mm were used in this experiment. The results of the experiment revealed that the feedback control-type ionizer system had the following characteristics: (1) it is possible to control the performance of the ionizer with a supply current; (2) the electrostatic field strength in the loading pipe from the charged powder is reduced and maintained at near zero by using the feedback control-type system; and (3) the performance of the feedback control-type system is superior to that of others, such as the conventional AC- or DC-type ionizers. |
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