A dust explosion environmental threshold test device and evaluation method under mechanical stimulation ignition mode

Abstract

The invention discloses a dust explosion environmental threshold test device and evaluation method under a mechanical stimulation ignition mode, belonging to the dust explosion subject research field. The test device includes a rectangular parallelepiped explosion container, an environment humidity control device, a protection device, a powder spraying device, a gas distribution device, a data acquisition control device and an ignition device. By applying different ignition methods, the control of the ignition device and ignition energy can be realized; the relative humidity of the environment in the container can be adjusted within the range of 0-95% through the environmental humidity control device; the ambient oxygen concentration can be adjusted between 0-95% through the gas distribution device Control within the range of 21%. This evaluation method can implement different ignition methods for a certain concentration of dust, and quantitatively evaluate the environmental threshold of dust explosion, and obtain the concentration threshold of dust explosion under different ignition methods, different ignition energies, different relative humidity and different ambient oxygen concentrations, and realize The multi-dimensional evaluation of dust explosion environment threshold conditions is carried out.

Description

technical field [0001] The invention relates to a dust explosion environmental threshold test device and evaluation method in a mechanical stimulation ignition mode, belonging to the field of dust explosion subject research. Background technique [0002] The ignition sources of dust explosions mainly include mechanical stimuli, such as high-temperature sparks, high-temperature hot surfaces, and static sparks generated by external force impacts and rotational friction. When the flammable powder is prepared in an inert atmosphere, when the environmental threshold (relative humidity or ambient oxygen concentration) of the powder reaches a certain level, a dust explosion will easily occur when encountering an ignition source, and the flame will spread instantly throughout the dust space , forming high temperature and deflagration overpressure at the same time, causing incalculable casualties and economic losses, and becoming a key bottleneck restricting the development of many i...

AI Technical Summary

Problems solved by technology

However, the above ignition methods will hinder the formation of dust clouds, and cannot reflect the combustion and explosion characteristics of dust clouds under the mechanical stimulation ignition method.

At the same time, the existing device cannot meet the requirements of quantitatively changing the parameters such as ignition mode, ignition energy, dust concentration, ambient oxygen concentration and relative humidity, and thus cannot measure the environmental threshold value of dust explosion under different ignition modes. Domestic patent CN201410543075. 4. CN201410477928.9, CN201910583431.8, etc. did not meet this requirement

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