Evaluation of the 20 L dust explosibility testing chamber and comparison to a modified 38 L vessel for underground coal

Eades, Robert; Perry, Kyle A.; Johnson, Catherine E.; Miller, J.W.

doi:10.1016/j.ijmst.2018.05.016

Cited by 10 publications

(9 citation statements)

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“…Particle size distribution plays a significant role in the flame propagation process. It is the dominant physical parameter that affects explosion severity and ease of ignition for combustible dust [8]. Benedetto et al [9] suggested that when coarser particles exist, devolatilization and particle heating could control the explosion process.…”

Section: Resultsmentioning

confidence: 99%

Preliminary study on the tea dust explosion: the effect of tea dust size

et al. 2019

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Food-based dust is considered as combustible dust as they composed of distinct particles, regardless of the size or chemical composition and when suspended in air or any other oxidizing medium over a range of concentrations will present a fire or deflagration hazard. The explosion effect from food-based dust can cause catastrophic consequences because the initial shock wave from the explosion lift up more dust and triggers a chain reaction through the plant. One of the parameters that can enhance the explosion is the particle size of the dust. In this study, the effect of four different particle sizes of tea dust on the dust explosion severity was tested in a confined 20 L explosion bomb. Tea dust tends to explode due to its molecular structure which contains a carbon-hydrogen bond that can release the significant amount of thermal energy. The experimental results showed that the values of Pmax and (dP/dt)max of tea dust were more severe for the particle size of 160 ?m for which are 1.97 bar and 4.97 bar/s before drying and 2.09 bar and 7.01 bar/s after drying process. The finer dust reacted more violently than coarser ones. As particle size decreases, the rate of explosion pressure change increases, as long as the size is capable of supporting combustion.

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Section: Resultsmentioning

confidence: 99%

Preliminary study on the tea dust explosion: the effect of tea dust size

et al. 2019

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“…e explosive chamber was constructed from 308 steel and has a wall thickness of 9.525 mm. e chamber was constructed and tested by Materials Engineering and Testing Corporation and approved to accept pressures up to 2,068 kPA [10]. A schematic of the 38 L chamber is shown in Figure 2.…”

Section: Explosive Chamber and Experimental Setupmentioning

confidence: 99%

“…is is a deviation from the standard 20 L test vessel having an L/D ratio of one. e explosive chamber was designed with these dimensions to simulate the physical dimensions that are common in underground coal mines [10]. Specifically, this allows the coal dust sample to be placed in front of the air nozzle so that the air pulse passes directly over the sample.…”

Section: Explosive Chamber and Experimental Setupmentioning

confidence: 99%

“…Experiments ranged from 200 g/m 3 to 1,400 g/m 3 . Additionally, a set of tests were conducted at a concentration of 100 g/m 3 to investigate the effects of very small coal dust concentrations [10]. A 4 th trial was conducted at a concentration of 1,200 g/m 3 due to wide variation in the recorded peak pressure.…”

Section: Explosive Chamber and Experimental Setupmentioning

confidence: 99%

“…In this research, a series of coal dust explosibility tests were conducted using a new 38 L chamber, which is modeled after the standard 20 L chamber [10]. e primary design modification for this chamber is the placement of the dust sample within the chamber relative to the pressurized air pulse.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of a 38 L Explosive Chamber for Testing Coal Dust Explosibility

Eades

Perry

2019

Journal of Combustion

Self Cite

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Coal dust explosions are the deadliest disasters facing the coal mining industry. Research has been conducted globally on this topic for decades. The first explosibility tests in the United States were performed by the Bureau of Mines using a 20 L chamber. This serves as the basis for all standardized tests used for combustible dusts. The purpose of this paper is to investigate the use of a new 38 L chamber for testing coal dust explosions. The 38 L chamber features design modifications to model the unique conditions present in an underground coal mine when compared to other industries where combustible dust hazards are present. A series of explosibility tests were conducted within the explosive chamber using a sample of Pittsburgh pulverized coal dust and a five kJ Sobbe igniter. Analysis to find the maximum pressure ratio and Kst combustible dust parameter was performed for each trial. Based upon this analysis, observations are made for each concentration regarding whether the explosibility test was under-fueled or over-fueled. Based upon this analysis, a recommendation for future explosibility testing concentrations is made.

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Suspension characteristics of the coal-quartz dust mixture in the working environment during the fully mechanized mining process

Geng,

An,

Wang

et al. 2023

Environ Sci Pollut Res

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Dust exposures during mining activity can result in lung diseases such as Coal workers' pneumoconiosis (CWP) and silicosis, which are closely related to quartz dust. In the present study, coal-quartz dust mixture were investigated considering the particle size and the specific constituents. Multiple numerical techniques, including Computational Fluid Dynamics and Discrete Element Method (CFD-DEM), hard sphere model and direct monte carlo simulation (DSMC) were presented, and the dust diffusion process was investigated. According to the validation of the numerical model, the suspension characteristics of the polydisperse mixed dust were analyzed in detail. The results show that PM10 responds quickly with good following performance with the air flow. The particle size increases gradually from top to bottom.When the air velocity is low, the percentage of coal dust in the breathing zone tends to be 50%. The results provide theoretical guidance for the comprehensive prevention of the mixed dust in underground coal mines.

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Evaluation of the 20 L dust explosibility testing chamber and comparison to a modified 38 L vessel for underground coal

Cited by 10 publications

References 2 publications

Preliminary study on the tea dust explosion: the effect of tea dust size

Preliminary study on the tea dust explosion: the effect of tea dust size

Evaluation of a 38 L Explosive Chamber for Testing Coal Dust Explosibility

Suspension characteristics of the coal-quartz dust mixture in the working environment during the fully mechanized mining process

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Evaluation of the 20 L dust explosibility testing chamber and comparison to a modified 38 L vessel for underground coal

Cited by 10 publications

References 2 publications

Preliminary study on the tea dust explosion: the effect of tea dust size

Preliminary study on the tea dust explosion: the effect of tea dust size

Evaluation of a 38 L Explosive Chamber for Testing Coal Dust Explosibility

Suspension characteristics of the coal-quartz dust mixture in the working environment during the fully mechanized mining process

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Product

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Evaluation of the 20 L dust explosibility testing chamber and comparison to a modified 38 L vessel for underground coal