A review on understanding explosions from methane–air mixture

Kundu, Sazal; Zanganeh, Jafar; Moghtaderi, Behdad

doi:10.1016/j.jlp.2016.02.004

Cited by 170 publications

(71 citation statements)

References 55 publications

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“…Other researchers investigated the lower explosion concentration, lower oxygen concentration and hybrid, and the ignition influence on the coal dust explosion. These investigations used a confined explosion chamber such 20 and 1000 L explosion chambers . Other scholars investigated the minimum initiation energy of the coal dust, and the MAIT of a coal dust layer .…”

Section: Introductionmentioning

confidence: 99%

“…The conclusion was that the explosion sensitivity was reduced as the moisture content of the coal dust increased. Other studies investigated the influence of moisture on the heating rate and tendency for coal dust to spontaneously combust …”

Section: Introductionmentioning

confidence: 99%

“…These investigations used a confined explosion chamber such 20 and 1000 L explosion chambers. 4,[21][22][23][24][25][26][27][28][29][30][31] Other scholars investigated the minimum initiation energy of the coal dust, [32][33][34][35] and the MAIT of a coal dust layer. [36][37][38][39][40][41] The MAIT for a coal dust cloud, from a hot surface source, has been investigated in the past decades by many researchers.…”

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confidence: 99%

“…Other studies investigated the influence of moisture on the heating rate and tendency for coal dust to spontaneously combust. [21][22][23][24] In spite of the fact that there have been a number apparatus used to measure the MAIT of a dust cloud, the GG furnace (ASTM E1491) is recommended by the IEC standard for determination of the MAIT of dust clouds. 25,26 Despite the importance of the subject, there is little…”

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confidence: 99%

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The effects of coal dust concentrations and particle sizes on the minimum auto‐ignition temperature of a coal dust cloud

2017

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Summary Flash fires and explosions in areas containing an enriched combustible dust atmosphere are a major safety concern in industrial processing. An experimental study was conducted to analyse the effects of atmospheric coal dust particle sizes and concentrations on the minimum auto‐ignition temperature (MAIT) of a dust cloud. Two different coal samples from Australian coal mines were used. The coal dust particles were prepared and sized in 3 ranges, of below 74 μm, 74 to 125 μm and 125 to 212 μm, by using a series of sieves and a sieve shaker. A humidifier was used to increase the moisture content of the particles to the required level. All the experiments were conducted in accordance with the ASTM E1491‐06 method in a calibrated Goldbert‐Greenwald furnace. The results from this study indicate that coal dust properties, such as the chemical nature (H/C), concentration, particle size (D50), and moisture content, impact on the MAIT. For coal dust concentrations less than 1000 g.m−3, the MAIT decreases with increasing coal dust concentrations. On the other hand, for low concentrations of 100 to 15 g.m−3, the MAIT becomes more reliable for particle size D50 rather than for volatile matters.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effects of coal dust concentrations and particle sizes on the minimum auto‐ignition temperature of a coal dust cloud

2017

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“…Methane-air systems are lifethreatening mixtures, particularly in underground coal mines. Methane from coal mines initiated explosions, and the explosions are later escalated by coal dusts [8]. Experimental studies [9] show that particles increase the turbulent burning velocity because of the increase in the turbulence level by particle-turbulence interaction.…”

Section: Introductionmentioning

confidence: 99%

Multipoint radiation induced ignition of dust explosions: turbulent clustering of particles and increased transparency

Liberman

Kleeorin

Haugen

2018

Combustion Theory and Modelling

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It is known that unconfined dust explosions consist of a relatively weak primary (turbulent) deflagrations followed by a devastating secondary explosion. The secondary explosion may propagate with a speed of up to 1000 m/s producing overpressures of over 8-10 atm. Since detonation is the only established theory that allows a rapid burning producing a high pressure that can be sustained in open areas, the generally accepted view was that the mechanism explaining the high rate of combustion in dust explosions is deflagration to detonation transition. In the present work we propose a theoretical substantiation of the alternative propagation mechanism explaining origin of the secondary explosion producing the high speeds of combustion and high overpressures in unconfined dust explosions. We show that clustering of dust particles in a turbulent flow gives rise to a significant increase of the thermal radiation absorption length ahead of the advancing flame front. This effect ensures that clusters of dust particles are exposed to and heated by the radiation from hot combustion products of large gaseous explosions sufficiently long time to become multi-point ignition kernels in a large volume ahead of the advancing flame front. The ignition times of fuel-air mixture by the radiatively heated clusters of particles is considerably reduced compared to the ignition time by the isolated particle. The radiation-induced multi-point ignitions of a large volume of fuel-air ahead of the primary flame efficiently increase the total flame area, giving rise to the secondary explosion, which results in high rates of combustion and overpressures required to account for the observed level of overpressures and damages in unconfined dust explosions, such as e.g. the 2005 Buncefield explosion and several vapor cloud explosions of severity similar to that of the Buncefield incident.

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CMOS AlN and ScAlN Pyroelectric Detectors with Optical Enhancement for Detection of CO₂ and CH₄ Gases

Liang

et al. 2023

Adv Elect Materials

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Gassensors are useful for monitoring of greenhouse gases. As the move toward complementary metal-oxide-semiconductor (CMOS) compatible pyroelectric room temperature detectors is gaining traction due to its scalability to 8-in./12-in. wafer area and integrable with CMOS electronics, CMOS compatible aluminum nitride (AlN)-and scandium aluminum nitride (ScAlN)-based pyroelectric detectors are developed for sensing of CO 2 and CH 4 gases, which are two of the greenhouse gases that contribute significantly to global warming. Leveraging gas absorption at respective mid-infrared (IR) wavelengths, CO 2 and CH 4 gases are detected at various concentrations with fast response time ≈1 s. A compound parabolic collector (CPC) is designed and integrated into the gas sensor to enhance the optical flux received by the detector, which demonstrates ≈10× signal improvement in its presence. Further factors such as the effect of sensing area reduction and response to random gas concentrations are also tested on AlN-and ScAlN-based pyroelectric detectors respectively to observe the gas sensing behaviors of both detectors. The results obtained provide further understanding of the behavior of CMOS AlN-and ScAlN-based pyroelectric detectors as IR gas sensors, which can potentially inspire new design and design selection for various gas sensing applications.

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A review on understanding explosions from methane–air mixture

Cited by 170 publications

References 55 publications

The effects of coal dust concentrations and particle sizes on the minimum auto‐ignition temperature of a coal dust cloud

The effects of coal dust concentrations and particle sizes on the minimum auto‐ignition temperature of a coal dust cloud

Multipoint radiation induced ignition of dust explosions: turbulent clustering of particles and increased transparency

CMOS AlN and ScAlN Pyroelectric Detectors with Optical Enhancement for Detection of CO₂ and CH₄ Gases

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A review on understanding explosions from methane–air mixture

Cited by 170 publications

References 55 publications

The effects of coal dust concentrations and particle sizes on the minimum auto‐ignition temperature of a coal dust cloud

The effects of coal dust concentrations and particle sizes on the minimum auto‐ignition temperature of a coal dust cloud

Multipoint radiation induced ignition of dust explosions: turbulent clustering of particles and increased transparency

CMOS AlN and ScAlN Pyroelectric Detectors with Optical Enhancement for Detection of CO2 and CH4 Gases

Contact Info

Product

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CMOS AlN and ScAlN Pyroelectric Detectors with Optical Enhancement for Detection of CO₂ and CH₄ Gases