Minimum ignition temperature of carbonaceous dust clouds in air with CH4/H2/CO below the gas lower explosion limit

Tan, Xin; Schmidt, Martin; Zhao, Peng; Wei, Aizhu; Huang, Weixing; Qian, Xinming; Wu, Dejian

doi:10.1016/j.fuel.2019.116811

Cited by 28 publications

(4 citation statements)

References 35 publications

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“…The combustion heat for acetylene (1368 kJ/mol) is greater than that for methane (896 kJ/mol). The P max of pure acetylene reaches its maximum value at Φ = 1.8 33 , and P max reaches its maximum value at approximately Φ = 1.02, which is consistent with this paper's experimental results 47 . In addition, as shown in Fig.…”

Section: Resultssupporting

confidence: 92%

Influence of acetylene on methane–air explosion characteristics in a confined chamber

Jia

Zhu

Niu³

et al. 2021

Sci Rep

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To study the impact of acetylene on methane explosions, the safe operation of coal mines should be ensured. In this paper, a 20 L spherical tank was used to study the explosive characteristics of acetylene–methane–air mixture. In addition, the GRI-Mech3.0 mechanism was used to study the chemical kinetic mechanism for the mixed gas, and the effect of adding acetylene on the sensitivity of methane and the yield of free radicals was analysed. The results show that acetylene can expand the scope for methane explosion, lower the lower explosion limit, and increase the risk of explosion. Acetylene increases the maximum explosion pressure, laminar combustion rate and maximum pressure rise rate for the methane–air mixture while shortening the combustion time. Three combustion modes for the acetylene–methane–air mixture were determined: methane-dominated, transitional and acetylene-dominated combustion modes. Chemical kinetic analysis for the mixed gas shows that as the volume fraction of acetylene increases, the generation rate for key free radicals (H*, O* and OH*) gradually increases, thereby increasing the intensity of the explosive reaction. The results from this research will help formulate measures to prevent coal mine explosion accidents.

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Section: Resultssupporting

confidence: 92%

Influence of acetylene on methane–air explosion characteristics in a confined chamber

Jia

Zhu

Niu³

et al. 2021

Sci Rep

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“…Several works exploited such apparatus for its simplicity and its versatility, for instance, to study complex explosible mixtures, such as coal-rock dust binary mixtures [2] and carbonaceous dust clouds in presence of CH 4 , H 2 and CO [3]. The influence of the G-G furnace on the cloud particle size distribution was carried out by Bu et al [4], by identifying and quantifying the modification of characteristic diameters.…”

Section: Introductionmentioning

confidence: 99%

Study of flash pyrolysis and combustion of biomass powders using the Godbert-Greenwald furnace: An essential step to better understand organic dust explosions

Pietraccini

Badu

Tait

et al. 2023

Process Safety and Environmental Protection

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“…Mechanical operations involving combustible solids such as grinding, drying, dust collection, and so on, are always exposed to explosion risk. Various parameters studied for the design of explosion preventive and protective measures are minimum ignition temperature of dust‐air cloud; explosibility limits of dust (LEL and UEL—the lower and upper exposable limits concentration); minimum oxygen concentration to undergo explosion in dust‐air cloud; minimum ignition energy of the dust‐air cloud 4‐7 . The quantitative evaluation and interrelationship of these factors is a major requirement for the design of any preventive or protective measure against an explosion incident.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, in this work, determination of the limiting oxygen concentration (LOC) for pyrotechnic mixture was carried out. In the existing literatures, researchers 7,24 focused on blending an inert gas probably N 2 , Argon, etc, in the atmosphere, which reduces the supply of oxygen for combustion, and thereby the environment is made partially inert. Due to the reduction or unavailability of oxygen in the atmosphere, the possibility of ignition of the dust cloud is greatly reduced.…”

Section: Introductionmentioning

confidence: 99%

Experimentation on minimum ignition temperature for boron blended fireworks flash powder dust cloud at normal and inert environmental conditions

Arumugachamy¹,

Pandian²,

Jeyasubramanian³

2021

Fire and Materials

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Summary In fireworks industries, mixing and filling of chemicals are being done manually and hence, dust formation is inevitable. Due to inherent nature of ingredients like aluminium metal powder, which has more combustible and the possibilities of dust explosion are merely high. Nowadays, the use of boron as a replacement of aluminium in firecracker mixtures is being researched upon. Hence, this paper aims at measuring the minimum ignition temperature (MIT) of existing and boron blended firework composition by using Godbert Greenwald furnace. Nowadays, many firework industries are employing automation. In such places, by limiting the level of oxygen supply with Nitrogen gas, the accidents can be avoided. Hence, the limiting oxygen concentration (LOC) is also measured. It has been concluded that the probability of ignition is higher when the replacement level of aluminium with boron is less than 70% at a concentration of 1456 g/m3 with less than 75% inert gas level. The safe margin has been found which will be useful for risk assessment study.

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Minimum ignition temperature of carbonaceous dust clouds in air with CH4/H2/CO below the gas lower explosion limit

Cited by 28 publications

References 35 publications

Influence of acetylene on methane–air explosion characteristics in a confined chamber

Influence of acetylene on methane–air explosion characteristics in a confined chamber

Study of flash pyrolysis and combustion of biomass powders using the Godbert-Greenwald furnace: An essential step to better understand organic dust explosions

Experimentation on minimum ignition temperature for boron blended fireworks flash powder dust cloud at normal and inert environmental conditions

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