scholarly journals Numerical simulation of hypothetical gas explosions in a process unit: Effect of vapor barriers on explosion pressure

1989 ◽  
Author(s):  
D Bjerketvedt ◽  
E Nornes
Keyword(s):  
Numerical Simulation ◽  
Process Unit ◽  
Explosion Pressure ◽  
Gas Explosions

Numerical simulation of gas explosions in linked vessels

1999 ◽  
Vol 12 (3) ◽  
pp. 189-194 ◽  
Author(s):  
Michele Maremonti ◽  
Gennaro Russo ◽  
Ernesto Salzano ◽  
Vincenzo Tufano
Keyword(s):  
Numerical Simulation ◽  
Gas Explosions

Numerical Simulation on the Influence of Flammable Gas Concentration on Explosion Peak Pressure

2014 ◽  
Vol 1010-1012 ◽  
pp. 1531-1534
Author(s):  
Xiao Feng Ma
Keyword(s):  
Numerical Simulation ◽  
Peak Pressure ◽  
Gas Concentration ◽  
Explosion Pressure ◽  
Flammable Gas ◽  
Explosion Overpressure ◽  
Fluent Software

This paper simulates the alternation of the maximum explosion overpressure on the different condition of the concentration based on the fluent software. The results show the maximum explosion overpressure increases in the earlier stage and then decreases in the later stage because of the different flammable gas concentration: the maximum explosion overpressure enhanced in 6% gas concentration and drops in 12% gas concentration; it augments in 6% gas concentration and drops in 12% gas concentration with the joining of the hydrogen; the explosion pressure peaked just at the 9% concentration of the flammable gas.

scholarly journals Experimental Study of Gas Explosions in Hydrogen Sulfide-Natural Gas-Air Mixtures

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
André Vagner Gaathaug ◽  
Dag Bjerketvedt ◽  
Knut Vaagsaether ◽  
Sandra Hennie Nilsen
Keyword(s):  
Experimental Study ◽  
Hydrogen Sulfide ◽  
Natural Gas ◽  
Turbulent Combustion ◽  
Reference Data ◽  
Pressure Transducers ◽  
Explosion Pressure ◽  
Gas Explosions ◽  
The Rich ◽  
Combustion Of Hydrogen

An experimental study of turbulent combustion of hydrogen sulfide (H2S) and natural gas was performed to provide reference data for verification of CFD codes and direct comparison. Hydrogen sulfide is present in most crude oil sources, and the explosion behaviour of pure H2S and mixtures with natural gas is important to address. The explosion behaviour was studied in a four-meter-long square pipe. The first two meters of the pipe had obstacles while the rest was smooth. Pressure transducers were used to measure the combustion in the pipe. The pure H2S gave slightly lower explosion pressure than pure natural gas for lean-to-stoichiometric mixtures. The rich H2S gave higher pressure than natural gas. Mixtures of H2S and natural gas were also studied and pressure spikes were observed when 5% and 10% H2S were added to natural gas and also when 5% and 10% natural gas were added to H2S. The addition of 5% H2S to natural gas resulted in higher pressure than pure H2S and pure natural gas. The 5% mixture gave much faster combustion than pure natural gas under fuel rich conditions.

Study on Numerical Simulation of Gas Explosion inside Compression Compartment of Gas Filling Station

2014 ◽  
Vol 962-965 ◽  
pp. 531-538 ◽  
Author(s):  
Yu Wang ◽  
Yun Yi Wu
Keyword(s):  
Numerical Simulation ◽  
Influence Factors ◽  
Unit Weight ◽  
Point Location ◽  
Gas Explosion ◽  
Ignition Point ◽  
Explosion Pressure ◽  
Propagation Behavior ◽  
Filling Station ◽  
Open Pressure

For the compression compartment safety design in gas filling station, hazards of gas explosion inside compression compartment should be assessed, and explosion energy as well as influence factors should be determined. In this paper, numerical simulation was adopted to build 3D model of compression compartment and simulate gas explosion pressure and flame propagation behavior under different ignition point location, open-pressure and weight of relief panels. The results show that the ignition point location relative to the location of the vent opening and relief panel’s characteristics is very important for gas explosion inside compression compartment. The nearer the ignition point location is away from the venting opening location, the smaller the caused explosion pressure will be. For the relief panel, explosion pressure is proportional with the open-pressure and the weight of relief panel. Besides the rational distribution of ignition source and the adoption of relief panel with less unit weight and relief pressure, the crushing material damage and secondary hazard of flame should also be noticed in order to mitigate the hazard of gas explosion.

Flaws Simulation of Cave Depot in the Process of Explosion

2013 ◽  
Vol 385-386 ◽  
pp. 441-444
Author(s):  
Yi Hong Ou ◽  
Hai Bing Qian ◽  
Dong Wang ◽  
Ying Wu ◽  
Jian Jun Liang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Yield Surface ◽  
Dispersion Model ◽  
Research Result ◽  
Three Dimensional ◽  
Linear Increase ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Explosion Pressure ◽  
Online Monitor

This paper adopts the program Ansys and its secondary exploit platform tools to construct three-dimensional model to simulate the destroy process of cave depot. The method that damage surface and yield surface are dealt separately, and dispersion model is forward to simulate flaws. And the results of numerical simulation have been debated to find the laws of flaws growth and distribution with increasing of explosion pressure. It can be found that with the the linear increase of explosion pressure, flaws and distribution regions of flaws grow and expand. Tension flaws are precede to shear flaws. Flaws regions appear in the order , namely, the center of the arch--arch foot-- flaws in the center arch propagation - flaws in other else regions propagation. The research result has important value for online monitor, maintain and reinforce of cave depot. And the technology that has been forwarded in this paper also supplies for the numerical simulation researcher.

Numerical simulation of the influence of water vapor on gas explosions in a high-pressure environment

2020 ◽  
Author(s):  
Li Zou ◽  
Xin Yi ◽  
Haitao Li ◽  
Xixi Liu ◽  
Jun Deng
Keyword(s):  
High Pressure ◽  
Water Vapor ◽  
Vital Role ◽  
Water Vapor Content ◽  
Explosion Pressure ◽  
Maximum Explosion Pressure ◽  
Gas Explosions ◽  
Influence Of Water ◽  
Dry Conditions ◽  
High Pressure Environment

Abstract Gas explosion seriously threaten the employees security and restrict the safe production of coal mines. Therefore, it is particularly essential to investigate the prevention and control of gas explosions. In this study, a two-dimensional numerical model of a spherical explosion tank was developed to explore the effects of water vapor on gas explosions in a high-pressure environment. Explosion parameters of 10% gas, 1 MPa pressure, and water vapor contents varying from 0% to 8% were simulated using FLUENT software. The results show that the maximum explosion pressure and temperature of the premixed gas gradually decrease with increasing water vapor content, i.e., when the water vapor content is increased from 0% to 8%, the maximum explosion pressure and temperature of the gas mixture decreases from 2.52 MPa and 2092 K under dry conditions to 1.62 MPa and 1714 K with 8% water vapor. The attenuation amplitude is also reduced upon the addition of steam. Water vapor in premixed gas therefore plays a vital role in suppressing gas explosions.

Numerical simulation of size effects of gas explosions in spherical vessels

SIMULATION ◽  
2017 ◽  
Vol 93 (8) ◽  
pp. 695-705 ◽  
Author(s):  
Chen Yan ◽  
Zhirong Wang ◽  
Kai Liu ◽  
Qingqing Zuo ◽  
Yaya Zhen ◽  
...  
Keyword(s):  
Size Effect ◽  
Size Effects ◽  
Heat Dissipation ◽  
Adiabatic Condition ◽  
Spherical Vessel ◽  
Explosion Pressure ◽  
Maximum Explosion Pressure ◽  
Wall Boundary ◽  
Gas Explosions ◽  
The Law

To study the law of sizes on gas explosions, numerical simulations of methane–air mixture explosions in spherical vessels were performed. The law of sizes on gas explosions is studied using FLUENT simulations with the [Formula: see text] two-equation turbulent model, the eddy-dissipation-concept model, thermal dissipation at a wall boundary, the P1 model, and the SIMPLE algorithm. The experimental results suggest that under an adiabatic condition without energy loss, the maximum explosion pressures in different spherical vessels are all 0.82 MPa, and the effect on the explosion intensity in spherical vessels is small. Under the condition of heat dissipation at the wall boundary, the maximum explosion pressure increases with volume of the spherical vessel. However, the explosion intensity in this condition is lower than that in adiabatic condition. Also, the size effect is not obvious. The size effect on the explosion intensity is significant under the combined effects of heat dissipation at the wall boundary and thermal radiation, where the maximum explosion pressure increases with volume of spherical vessels. On the contrary, the maximum pressure rising rate decreases with the volume of the spherical vessels; this rule coincides with the “cube” law. The studies on the size effects of methane–air mixture explosions in a spherical vessel provide an important reference for establishing a model system that can be used to test and design industrial vessels.

Numerical Simulation of Offshore Gas Explosions

1991 ◽  
Author(s):  
A.C. van den Berg ◽  
C.J.M. van Wingerden
Keyword(s):  
Numerical Simulation ◽  
Gas Explosions
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