Experimental Research on the Suppression Effect of Different Types of Inert Dust on Micron-Sized Lignite Dust Explosion Pressure in a Confined Space

Abstract

Coal is an important strategic resource in the world; coal production safety has always been widely concerned. In coal mine production, inert dust can effectively reduce coal dust explosion accidents in mine tunnels. To reveal the suppression effect of inert dust on lignite dust explosion, CaCO 3 , SiO 2 , and NH 4 H 2 PO 4 are selected for suppression experiments. It is found that the lignite dust explosion pressure decreases continuously as the mass percentages of inert dust mixed into lignite dust increase. By calculating the molar mass, the suppression effects of CaCO 3 and SiO 2 on lignite dust explosion are compared. The lignite dust no longer explodes when the mass percentage of NH 4 H 2 PO 4 dust mixed into lignite dust is 70%, indicating that NH 4 H 2 PO 4 is more effective than that of CaCO 3 and SiO 2 . The smaller the particle size of NH 4 H 2 PO 4 , the better the suppression effect on explosion. The lignite dust does not explode when the mass percentage of NH 4 H 2 PO 4 is 60% and the particle size of NH 4 H 2 PO 4 is 25–38 μm, which proves that decreasing the particle size of NH 4 H 2 PO 4 is important to suppress explosion. The research results are of great significance for grasping the explosion suppression effect of inert dust on lignite dust.

Gas–Solid Flow Characteristics of Airflow and Dust Particles in Blasting Excavation of Underground Metal Mine Tunnels

“…The progress of underground mining mechanization and the demand for large-scale high-intensity mining cause a sharp increase in total dust production during underground mine tunneling. − Diffusion of high-concentration dust particles not only pollutes the underground working environment and reduces the production efficiency but also seriously endangers the respiratory system of workers and, in specific cases, even triggers dust explosions. − In the past 10 years, the global incidence rate of pneumoconiosis has increased by 61.5% . Miners account for over 90% of occupational pneumoconiosis patients in China .…”

Research on inhibitory effect of mixed suppressants CaCO3, KCl, and K2CO3 on coal dust explosion pressure

“…In the preliminary research of the authors, theoretical and experimental studies have been conducted on the characteristics of explosion ignition, flame propagation process, and the influence of related factors 39 – 43 . The author also obtained some inhibitory effects of explosion suppressants on the intensity of coal dust explosions, but these results are limited to the use of single component explosion suppressants 44 – 46 . Furthermore, the authors believe that further research is needed in the field of coal dust explosion and its suppression.…”

Development of a Coal Dust Concentration Sensor Based on the Electrostatic Induction Method

“… 1 , 2 A large amount of coal dust is can easily cause major disasters and accidents such as coal dust explosions. 3 , 4 In 2021, due to a large coal dust explosion accident, seven people died in one Coal Mine in Shandong Province, China. Workers who are frequently exposed to coal dust are also prone to incurable pneumoconiosis, which may lead to loss of labor force or life.…”

“…Coal is one of the main energy sources for the development of the human economy. In the production process of coal mines, a large amount of coal dust is inevitably generated due to coal cutting and transfer. , A large amount of coal dust is can easily cause major disasters and accidents such as coal dust explosions. , In 2021, due to a large coal dust explosion accident, seven people died in one Coal Mine in Shandong Province, China. Workers who are frequently exposed to coal dust are also prone to incurable pneumoconiosis, which may lead to loss of labor force or life. , Therefore, the harm of coal dust in coal mines cannot be ignored, and it is necessary to accurately detect the concentration of coal dust in coal mine operation sites.…”