Journal of Japan Society for Safety Engineering
Online ISSN : 2424-0656
Print ISSN : 0570-4480
ISSN-L : 0570-4480
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Volume 42, Issue 1
JOURNAL OF JAPAN SOCIETY FOR SAFETY ENGINEERING_2003_1
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ORIGINAL PAPER
  • Development of a New Apparatus Using Ultrasonic Vibration toMeasure the Electric Spark lgnition Energy for Dust Clouds
    Kwang Seok Choi, Mizuki Yamaguma, Manabu Takeuchi
    2003 Volume 42 Issue 1 Pages 60-67
    Published: February 15, 2003
    Released on J-STAGE: January 31, 2017
    DOIhttps://doi.org/10.18943/safety.42.1_60
    JOURNAL FREE ACCESS
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    This paper describes an apparatus used to measure the minimum electric spark ignition energy far combustible dust clouds. Instead of a transient suspencled dust claud, as in the conventional Hartmann tube apparatus, this one forms a curtain-1il{e, constant da~vnstream of dust in an explosion chamber by ccnTibining an ultrasonic vibrator, a sieve, and a

    specially designed dust happer While passing through the gap of two electrocles placed in the middle of an explosion chamber, sparks are given to tl]e dust stream to determine its minimum ignitian energy (MIE) The concentration of a dust cloud can be easily changed by adjusting the current of the vibrator. The apparatus is equipped with two pieces of coarse metal mesh, which function as flame arresters and are placed i ust below the sieve and over the base of the explosion chamber to protect the chamber and enable the recycling of untested dust By comparing the MIE values of several 8amples of dust with those obtained by the conventianal method, the new method was confrmed to give. reliable data.

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