Device and method for testing dust layer ignition susceptibility under action of electric spark

Abstract

The invention provides a dust-layer ignition sensitivity testing device and method under the action of electric sparks. The device comprises a base, a stand column, a dust carrying platform, a retractable cantilever beam and an electric spark generator, wherein a needle tip electrode is fixedly arranged at one end of the retractable cantilever beam, and the other end of the retractable cantilever beam sleeves the stand column; the dust carrying platform is provided with a dust drawing disc and a dust-layer preparation cover; an anode of the electric spark generator is connected with the needle tip electrode, and a cathode of the electric spark generator is conducted to the dust drawing disc. The method comprises the following steps: horizontally arranging the testing device and finishing wiring; controlling the retractable cantilever beam to be retracted back and preparing a dust layer according to a set thickness; controlling the retractable cantilever beam to be stretched so that the tip of the needle tip electrode is located just above the dust layer, and adjusting the distance between the needle tip electrode and the dust layer; starting the electric spark generator and outputting highest energy; identifying whether dust to be detected has ignition sensitivity or not; if so, preparing the dust layer again and carrying out a sensitivity test of the ignition sensitivity; measuring smallest ignition energy of the dust layer under different thicknesses through adjusting output energy of the electric spark generator and the thickness of the dust layer.

Description

technical field [0001] The invention belongs to the technical field of industrial dust explosion protection, in particular to a device and method for testing the ignition sensitivity of a dust layer under the action of electric sparks. Background technique [0002] In the combustible powder process industry, electric sparks generated by static electricity are relatively common ignition sources for dust explosions. In order to evaluate the explosion risk of combustible dust clouds under the action of electric sparks, a set of minimum ignition energy test standards for dust clouds have been promulgated at home and abroad. For example, CEI IEC 61241-2-3-1994, BS EN 13821-2002, ASTM E2019-03-2007, etc. Based on the above standards, many dust cloud minimum ignition energy test devices have emerged, such as MIKE 3 in Switzerland. [0003] However, in actual industrial production, not only cloudy dust, layered dust is also a common form of combustible dust, and according to existin...

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Problems solved by technology

[0004] However, for how to test and evaluate the explosion risk of layered dust under the action of electric sparks, there are no relevant test standards promulgated at this stage, and there is no standard-based test device, which is sensitive to the ignition of existing dust layers. Test standards for dust ignition susceptibility testing under the action of high-temperature hot surfaces

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