On-line Monitoring of Electrostatic Charge in Powder Pneumatic Transportation Process [Translated]†

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This paper describes a novel system for continuous monitoring of powder electrostatic charge in pneumatic transportation process. An electrostatic detecting system based on the electrostatic field strength measurement, together with a purge air system for preventing powder adhesion, has been newly developed. Performance of the system has been confirmed in a powder pneumatic transportation process under various kinds of powder materials and operating conditions. Specific charge of powder and the induced current at the transportation pipe were simultaneously measured. The relationship between the electrostatic field strength and the space charge density and the measured induced current were investigated. It is found that the electrostatic field strength has linear relationship between the space charge density and the induced current. This proves that our newly developed system is a very effective and simple device for continuously measure the electrical charge of powder. A model for the powder charge in the pneumatic transportation process has also been proposed here to understand the powder charge mechanism.† This report was originally printed in J. Soc. Powder Technology, Japan. 34(10), 778-784 (1997), 35(12), 846-855 (1998)in Japanese, before being translated into English by KONA Editorial Committee with the permission of the editorial committee of the Soc. Powder Technology, Japan.
公益財団法人ホソカワ粉体工学振興財団の論文