Propagation Process of Noncaking Coal Dust Explosion Impact Airflow and Generation Characteristics of CO and CO ₂ in Vertical Space

High Resolution Image Download MS PowerPoint Slide The explosion hazards of noncaking coal dust have received widespread attention. To obtain the characteristics of noncaking coal dust explosions in vertical space, research has been conducted on the impact airflow and toxic and harmful gas products. It is found that the impact airflow velocity first increases and then decreases. t = 45 ms is a sufficient reaction time inside the vertical space, and the impact airflow velocity has reaches its maximum. The expansion of the high-temperature region and the high-speed airflow promote the propagation of CO, expanding the toxic range of CO. A certain concentration of CO 2 is generated in the ignition region, with a mass concentration of over 0.08%. This indicates that in the initial stage of a coal dust explosion, the amount of CO 2 generated has reached a certain concentration, posing a potential threat to the environment and personnel safety. The region of y = 0.13∼0.3 m is affected by the rising impact airflow and wall effects, and the CO 2 generated in the central region of the pipe is much lower than that generated in the wall region. This phenomenon reveals the uneven distribution of gas products during the explosion process, which is of great significance for understanding the dynamics of explosions and the propagation mechanism of gas products.