01/06/2020
Ignited hard coal

Ignited hard coal

Source: BAM division Explosion Protection Gases and Dusts

Industrial explosions and fires caused by the ignition of combustible dusts continue to represent a hazard potential that should not be neglected in all industrial areas where such materials are produced or used. The determination of suitable protective measures to prevent fires and explosions is generally based on so-called safety parameters of the materials used, which are determined by means of internationally standardized test methods.

Often, however, it is not easily possible to transfer the parameters determined in these tests, such as ignition temperatures, to practical conditions. Boundary conditions which are different from those in the test procedures can both reduce and increase the risks occurring in industrial practice. An adaptation of the protective measures to be taken is then necessary from both a safety and an economic point of view. Numerical calculation models represent an effective tool for assessing the fire and explosion hazards as a function of various boundary conditions.

Within the scope of a guest scientific exchange with the Sichuan University Chengdu, China, as well as with other partners, the experimental investigation of the ignition behaviour of dust layers, especially in oxygen-enriched atmospheres, was carried out. Based on the investigations, numerical models and kinetic input parameters were adapted. This enabled a significantly improved assessment of ignition hazards that occur and thus a correspondingly improved definition of measures for fire and explosion prevention.

Theoretical and numerical study on ignition behaviour of coal dust layers on a hot surface with corrected kinetic parameters
Martin Schmidt, D. Wu, Z. Song, Q. Zhang, X. Qian
published in the Journal of Hazardous Materials, Vol. 368, pages 156 - 162, 2019
BAM division Explosion Protection Gases and Dusts