Effects of concentration, temperature, humidity, and nitrogen inert dilution on the gasoline vapor explosion

Qi, Sheng; Du, Yong; Zhang, Peili; Li, Guoqing; Zhou, Yi; Wang, Bo

doi:10.1016/j.jhazmat.2016.06.040

Cited by 64 publications

(17 citation statements)

References 49 publications

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“…It is not only affected by explosion pressure parameters, but also ignition characteristics and laminar combustion speed will affect this combustion behavior, but the volume ratio of the mixed fuel will be different. For example, Qi et al 49 and Zhang et al 36 divided the combustion behaviour for premixed methane-hydrogen into three modes. Wang et al 40 and Luo et al 48 also found similar laws in the combustion of a mixed gas of methane, ethylene, and ethane.…”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

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

Jia

Zhu

Niu³

et al. 2021

Sci Rep

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“…The 20 L spherical explosive device is filled with aluminum powder of different qualities to form a dust cloud in the explosive tank with concentrations of 200, 400, 600, 800, and 1000 g/m 3 , 1200 g/m 3 , the dust cloud concentration in the experimental device is the calculated concentration. [34][35][36] 3 | RESULTS AND DISCUSSION ance. 34,35 The heat balance relationship is:…”

Section: Concentration Setting Of Aluminum Dustmentioning

confidence: 99%

Research on deflagration characteristics and thermodynamic mechanism of micron aluminum powders

Yan

Meng

Wang

et al. 2021

Process Safety Progress

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Taking three kinds of micron aluminum powder as the research object, taking the deflagration characteristics and dynamic mechanism of aluminum dust as the main line of research, using high-speed camera system and temperature measurement system to study the dust cloud of three kinds of aluminum powder with different concentration in the transparent pipe dust flame The flame shape, propagation speed, and temperature change law of the propagation device, the flame propagation speed and temperature increase with the increase of dust cloud concentration, and decrease with the increase of particle size; through the experiment of 20 L spherical explosive device, the empirical regression equation of maximum explosion pressure Pmax and maximum pressure rise rate (dP/dt)max is obtained, the explosion pressure (Pmax) will first increase and then decrease with the dust concentration, (dP/dt)max increases with the increase of dust concentration, while Pmax and (dP/dt)max increase with the decrease of particle size; The explosion products of aluminum powder were analyzed by XPS and surface energy spectrum, and the main substances of the explosion products were Al2O3, Al(OH)3, and unburned Al, and the deflagration mechanism model of micron aluminum powder was obtained; at the same time, the simultaneous thermal analyzer (TG-DSC) was used to conduct microscopic thermal analysis kinetics experimental research on micron aluminum powder with different particle sizes. The combustion process of aluminum powder in the air was divided into three stages. Fit the curve by analyzing and calculate the reaction kinetic parameters of the aluminum dust combustion process. The smaller the particle size of the micron aluminum powder, the more aluminum particles involved in the oxidation reaction, the more intense the combustion reaction, the faster the flame propagation speed, the greater the height of the flame front, the greater the explosion pressure, the exothermic phenomenon is significant, and the activation energy required for the oxidation reaction to occur is smaller.

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“…The variation of environmental factors such as temperature and humidity affect the overpressure developed due to VCE. 43 However, this study is focused on considering environmental factors in Malaysia offshore platforms at South China Sea, where the mean maximum temperature changes between 30 C and 31.6 C and mean relative humidity changes between 83% and 87%. 44 This temperature and humidity variations are small and will not have significant effect on resulting overpressure.…”

Section: Energy Factormentioning

confidence: 99%

“…lists the input parameters and states considered for the current study. Total of 195 dispersions and 195 VCE simulations were performed which covers the range of leak rates, leak directions of methane gas and wind speeds and wind directions.The variation of environmental factors such as temperature and humidity affect the overpressure developed due to VCE 43. However, this study is focused on considering environmental factors in Malaysia offshore platforms at South China Sea, where the mean maximum temperature changes between 30 C and 31.6 C and mean relative humidity changes between 83% and 87% 44.…”

mentioning

confidence: 99%

Effect of wind directions on human injury and fatality risk modeling due to vapor cloud explosion in offshore platforms

Niazi

Nasif

Muhammad

2019

Process Safety Progress

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Vapor cloud explosion (VCE) accidents have the potential to cause loss of life in offshore platforms. In order to quantify risk, quantitative risk assessment has served as a robust methodology. However, previous research focuses on macroscale assessment of risk which does not take into consideration the local specific details such as piping and equipment congestions. The overpressure developed by VCE is greatly influenced by local specific details. In addition, VCE occurs due to the ignition of vapor cloud that is influenced by parameters such as wind speeds and directions. This study investigates the effect of different wind conditions on VCE and resulting human injury and fatality risk by employing a grid‐based approach in an offshore platform. Flame Acceleration Simulator software is utilized to model dispersion of vapor cloud and resulting VCE. The methodology is an integrated tool that enables a grid‐by‐grid mapping risk, thereby providing a complete and precise picture of risk in all the locations. It was found that risk values were increased to maximum of 91% when wind speed was increased from 0 to 7 m/s. Among four wind directions, West to East wind direction recorded maximum risk values and South to North wind direction recorded minimum risk values.

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Effects of concentration, temperature, humidity, and nitrogen inert dilution on the gasoline vapor explosion

Cited by 64 publications

References 49 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

Research on deflagration characteristics and thermodynamic mechanism of micron aluminum powders

Effect of wind directions on human injury and fatality risk modeling due to vapor cloud explosion in offshore platforms

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