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

Abstract

A device and method for testing the ignition sensitivity of dust layers under the action of electric sparks. The device includes a base, a column, a powder carrier, a telescopic cantilever beam and an electric spark generator. One end of the telescopic cantilever beam is fixed with a needle tip electrode, and the other end is equipped with a needle tip electrode. Connected to the column, the powder carrying platform is equipped with a powder dragging tray and a dust layer preparation cover. The positive electrode of the electric spark generator is connected to the needle tip electrode, and the negative electrode is connected to the powder dragging tray. The method is: place the test device horizontally and complete the wiring, control the telescopic cantilever beam to retract, prepare the dust layer according to the set thickness, control the telescopic cantilever beam to extend, so that the tip of the needle tip electrode is directly above the dust layer and adjust the distance between the two, and start The electric spark generator outputs the highest energy to determine whether the dust to be measured has fire sensitivity. If it has fire sensitivity, prepare the dust layer again and then conduct the sensitivity test of fire sensitivity. By adjusting the output energy of the electric spark generator and the dust Layer thickness, measure the minimum ignition energy of the dust layer under different thicknesses.

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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