Method and device for testing minimum ignition energy of combustible dust/combustible gas mixture

Abstract

The invention discloses a method and device for testing the minimum ignition energy of a combustible dust / combustible gas mixture. The device comprises a quartz glass tube, an ignition electrode, a diffuser, a copper sleeve, a base, a high-voltage discharging device, an ignition electrode joint seat, a gas storage tank, a first air inlet valve, a second air inlet valve, a third air inlet valve, afourth air inlet valve, a first compressed gas bottle, a second compressed combustible gas bottle, a control valve, a blind flange, an explosion venting valve and a vacuum pump, wherein the quartz glass tube is vertically fixed at the base through bottom threads; the ignition electrode is fixed at the lower part of the quartz glass tube through the ignition electrode joint seat and the copper sleeve; and the diffuser is used for raising dust covering the surface of the diffuser up through airflow so as to form dust cloud. By improving a gas distribution technique and a powder spraying technique, the uniform distribution of the combustible dust / combustible gas mixture in air is realized in the ignition moment, so that the minimum ignition energy of the combustible dust / combustible gas mixture can be accurately detected.

Description

technical field [0001] The invention relates to the technical field of combustible dust research, in particular to a method and device for testing the minimum ignition energy of a combustible dust / combustible gas mixture. Background technique [0002] At present, the minimum ignition energy of dust cloud is one of the most important explosion characteristic parameters of combustible dust. It describes the minimum ignition energy that can ignite combustible dust suspended in the air and maintain combustion. During this ignition and combustion process, combustion The substance is a mixture of combustible dust and air. However, in quite a lot of modern industrial production, due to the complex process and various raw materials, intermediates and products, a mixed substance composed of combustible dust, combustible gas and air is often formed in a specific environment and space. Including organic synthesis powder and combustible gases such as ethylene in the resin and plastic p...

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Problems solved by technology

[0003] Combustible dust / combustible gas mixture explosion accidents account for a considerable proportion of the total number of industrial dust explosion accidents. In such accidents, although the mixed concentration of combustible gas is often not high, because the gas is involved in the dust cloud initiation and explosion reaction process, The explosion mechanism and disaster effect of this kind of mixture are significantly different from the traditional single dust cloud explosion accident and are more complicated. It is of great significance to accurately prevent the occurrence of such accidents

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