Experimental and numerical study on pressure dynamic and venting characteristic of methane-air explosion in the tube with effect of methane concentration and vent burst pressure

Cao, Yang; Li, Bin; Xie, Lei; Pan, Xuhai

doi:10.1016/j.fuel.2022.123311

Cited by 28 publications

(4 citation statements)

References 45 publications

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“…While natural resources (including fossil fuels) are constantly shrinking, as well as many efforts being taken to protect the environment, there is an increasing interest in alternative fuels like light hydrocarbons. In order to better understand and estimate the explosion hazards in power technologies, more research (both experimentally and numerically) has to be conducted on the fundamental safety characteristics of such fuels at various and elevated initial conditions, like ignition or fire and explosion characteristics, such as: maximum explosion pressure [1,2], maximum rate of explosion pressure Energies 2024, 17, 2855 2 of 18 rise [3], and heat release rate [4], as well as one of the most important parameters of flame propagation, mainly laminar burning velocity (LBV) [5,6]. LBV is the significant safety property describing the combustible (fuel and oxidizer) mixture in process industries.…”

Section: Introductionmentioning

confidence: 99%

Deflagration Dynamics of Methane–Air Mixtures in Closed Vessels at Elevated Temperatures

Porowski,

Kowalik,

Nagy

et al. 2024

Energies

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In this paper, we explore the deflagration combustion of methane–air mixtures through both experimental and numerical analyses. The key parameters defining deflagration combustion dynamics include maximum explosion pressure (Pmax), maximum rate of explosion pressure rise (dP/dt)max, deflagration index (KG), and laminar burning velocity (SU). Understanding these parameters enhances the process of safety design across the energy sector, where light-emissive fuels play a crucial role in energy transformation. However, most knowledge on these parameters comes from experiments under standard conditions (P = 1 bar, T = 293.15 K), with limited data on light hydrocarbon fuels at elevated temperatures. Our study provides new insights into methane–air mixture deflagration dynamics at temperatures ranging from 293 to 348 K, addressing a gap in the current process industry knowledge, especially in gas and chemical engineering. We also conduct a comparative analysis of predictive models for the laminar burning velocity of methane mixtures in air, including the Manton, Lewis, and von Elbe, Bradley and Mitcheson, and Dahoe models, alongside various chemical kinetic mechanisms based on experimental findings. Notably, despite their simplicity, the Bradley and Dahoe models exhibit a satisfactory predictive accuracy when compared with numerical simulations from three chemical kinetic models using Cantera v. 3.0.0 code. The findings of this study enrich the fundamental combustion data for methane mixtures at elevated temperatures, vital for advancing research on natural gas as an efficient “bridge fuel” in energy transition.

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Section: Introductionmentioning

confidence: 99%

Deflagration Dynamics of Methane–Air Mixtures in Closed Vessels at Elevated Temperatures

Porowski,

Kowalik,

Nagy

et al. 2024

Energies

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“…The results proved that with the increase of the proportion of H2, the same volume of the gas cloud will produce a higher peak overpressure. Cao et al 23 used numerical simulation to study the effect of methane concentration on the internal pressure of the pipeline. When the concentration was 7 vol%, the pressure time-course curve showed almost no significant oscillations.…”

Section: Introductionmentioning

confidence: 99%

Research on shock wave driving technology of methane explosion

Huang,

Liu,

Xin

et al. 2024

Sci Rep

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In order to improve the driving ability of the explosion wave simulation equipment, reduce the erosion effect of condensed explosives on the explosion wave simulation equipment, improve the safety of the test process, and make better use of the meteorological detonation driving method, it is necessary to optimize the source of the shock wave load in the driving section. Based on the finite volume method of FLACS, a methane detonation driving model corresponding to the test is established to explore the feasibility of using methane as an explosion source to test the structure against explosion shock wave. A methane detonation drive test was carried out to verify the accuracy of the numerical model. Finally, an engineering model for attenuation of shock wave overpressure peak value in pipeline is established by dimensional analysis, and the model coefficient is determined by numerical simulation and test data. The results show that the blast pressure is the highest when the methane volume ratio reaches 9.5 vol% in the methane-air mixture. Simply increasing oxygen content has little effect on the peak overpressure and positive pressure duration of shock wave. In the pure oxygen environment, the detonation effect can be achieved when the volume ratio of methane to oxygen is 1:2, and the incident pressure of the shock wave is proportional to the volume of the gas cloud. When the gas cloud volume is constant, a reasonable selection of methane-oxygen mixture ratio can achieve a better detonation effect, which can effectively increase the peak overpressure of the shock wave in the test section. The research results can provide technical reference for the development of new explosion wave simulation equipment.

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“…Methane, which is a key component of natural gas, has the advantages of high heat value, easy transportation, and low pollution emissions. It is widely used in industrial production and life, for example, cooking, automobile driving, and so on. − Methane is both flammable and explosive and will cause fire and explosion hazards upon encountering high temperatures or electrical sparks, resulting in huge economic and property losses .…”

Section: Introductionmentioning

confidence: 99%

“…Methane, which is a key component of natural gas, 1 has the advantages of high heat value, easy transportation, and low pollution emissions. It is widely used in industrial production and life, for example, cooking, automobile driving, and so on.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of External Flame Evolution and Temperature Characteristics after a Methane Explosion in a Rectangular Chamber

Xing

et al. 2023

ACS Omega

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A series of methane-vented explosions were experimentally investigated in a 4.5 m3 rectangular chamber at P 0 = 100 kPa and T 0 = 298 K, and the effects of ignition positions and vent areas on the external flame and temperature characteristics were studied. The results indicate that the vent area and ignition position significantly affect external flame and temperature changes. The external flame is portioned into three stages: an external explosion, a violent flame jet with a blue flame, and a yellow flame venting. The temperature peak first rises and then reduces with increasing distance. Rear ignition produces the largest flame lengths and highest temperature, while front ignition leads to the shortest flame and smallest temperature peak. The maximum flame diameter occurs at central ignition. As vent areas increase, the coupling effect of the pressure wave and the internal flame front weakens and the diameter and peak of the high-temperature peak increase. These results can offer scientific guidance for designing disaster prevention measures and evaluating explosion accidents in buildings.

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Experimental and numerical study on pressure dynamic and venting characteristic of methane-air explosion in the tube with effect of methane concentration and vent burst pressure

Cited by 28 publications

References 45 publications

Deflagration Dynamics of Methane–Air Mixtures in Closed Vessels at Elevated Temperatures

Deflagration Dynamics of Methane–Air Mixtures in Closed Vessels at Elevated Temperatures

Research on shock wave driving technology of methane explosion

Experimental Study of External Flame Evolution and Temperature Characteristics after a Methane Explosion in a Rectangular Chamber

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