• 한국안전학회지
• /
• 제20권4호
• /
• pp.34-39
• /
• 2005

To evaluate characteristics of explosion hazard of Methyl Ethyl Ketone Peroxide, MCPVT was used for this study. In result maximum explosion pressure and maximum explosion pressure rising velocity of MEK-PO were $12.1kgf/cm^2\;and\;106.81kgf/cm^2/s$. As a result or adding metal powder to estimate hazard of explosion, the maximum explosion pressure and maximum explosion pressure rising velocity according to adding Fe powder in MEK-PO increased. In opposite, those decreased resulting in adding Ca powder in MEK-PO.

• 한국가스학회지
• /
• 제8권4호
• /
• pp.50-54
• /
• 2004

Methyl Ethyl Ketone Peroxide의 분해폭발로 인한 폭발의 위험성을 평가하기 위하여 소형압력용기 시험기(MCPVT)를 사용하여 실험을 하였다. 그 결과 최대폭발 압력은 MEKPO와 MEKPO에 $98\%H_2SO_4$의 첨가량이 $1\%,\;3\%$ 및 $5\%$로 증가할 수록 증가하였으며, 최대폭발압력상승 속도도 증가하였다. 또한 분해개시 압력하에서의 온도는 $H_2SO_4$의 첨가량이 증가할수록 $168.16^{\circ}C,\;126.76^{\circ}C,\;91.21^{\circ}C$ 및 $81.25^{\circ}C$로 낮아졌다.

• 한국안전학회지
• /
• 제20권3호
• /
• pp.78-83
• /
• 2005

In this study, the evaluate characteristics of fire and explosion of MEK-PO are subjected to spontaneous ignition, flash point and explosion hazard. The minimum ignition temperature and instantaneous ignition temperature for MEK-PO were $188.5^{\circ}C\;and\;230^{\circ}C\;at\;225{\mu}L$. In addition The flash point for MEK-PO was obtained at $49^{\circ}C$. Furthermore, the maximum explosion pressure and the maximum explosion pressure rising velocity: using MCPVT (mini cup pressure vessel tester) were $10.82kgf/cm^2\;and\;33.72kgf/cm^2{\cdot}s$.

• 한국안전학회지
• /
• 제7권3호
• /
• pp.66-72
• /
• 1992

An experimental study was carried out to analyse the explosion characteristics of flammable gas-air mixtures. Used flammable gases were hydrogen, methane, acethylene, ethylene and pro-pane, explosion Pressure, explosoin pressure rising rate, and flame propagation velocity were measured experimentaly. The maximum explosion pressure and rising rate of flammmalbe gas air mixtures were appeared at the range of slightly higher concentration than the stoichiometric concentration. Initial pressure before explosion was controlled from 0.6 to 2.0kg/cm absolutly. Explosion pressure was increased with increment of the initial pressure, and the relationship between initial pressure and explosion pressure was Pe = KPi. The effect of vessel size on explosion characteristics was also analysed In this experiment. Explosion pressure was increased with in-creasing the vessel size, otherwise explosion pressure rising rate was decreased. When we locate a dummy material in vessel explosion pressure was decreased with increasing the dummy volume but exlosion pressure rising rate was increased.

• 한국가스학회지
• /
• 제9권1호
• /
• pp.38-43
• /
• 2005

도시가스의 폭발특성을 평가하기 위하여, 산소의 농도와 초기압력의 변화에 따라 실험을 행하였다 이러한 실험을 행한 결과 산소농도가 낮아짐에 따라 폭발범위는 점차적으로 좁혀졌으며, 산소농도 $12\%$에서 폭발한계산소농도를 구하였다. 도시가스의 초기압력이 증가함에 따라 폭발하한계가 약간 증가하였다. 또한 초기압력이 $0{\~}1.0 kgf/cm^2{\cdot}g$로 변함에 따라 최대폭발압력은 $6.3 kgf/cm^2{\cdot}g,\;12.7 kgf/cm^2{\cdot}g$을 구하였으며, 최대폭발압력상승속도는 $245.63 kgf/cm^2/s,\;427.88 kgf/cm^2/s$를 구하였다.

• 한국가스학회지
• /
• 제9권3호
• /
• pp.9-14
• /
• 2005

변성가스의 폭발특성을 평가하기 위하여, 산소농도 변화와 수소의 첨가에 따른 변성가스 조성을 변화시켜 폭발거동에 대한 실험을 행하였다. 이러한 실험을 행한 결과 산소농도 $21\%$에서 변성가스와 수소의 농도가 증가할수록 폭발하한계는 낮아졌으며, 산소농도 $6\%$에서 폭발한계산소농도를 구하였다. 변성가스의 최대폭발압력은 $4.61 kg_f/cm^2$의 최적값을 얻었고, 이때 최대폭발압력상승속도는 변성가스 농도 $40\%$에서 $130.75 kg_f/cm^2/s$를 구하였다. 또한 폭발에 필요한 최소점화에너지는 변성가스 농도 $50\%$에서 0.13 mJ를 구하였다.

• 한국해양공학회지
• /
• 제35권1호
• /
• pp.38-49
• /
• 2021

Slug flow is the most common multi-phase flow encountered in oil and gas industry. In this study, the hydrodynamic features of flow in pipes investigated numerically using computational fluid dynamic (CFD) simulations for the effect of slug flow on the vertical and bent pipeline. The compressible Reynold averaged Navier-Stokes (RANS) equation was used as the governing equation, with the volume of fluid (VOF) method to capture the outline of the bubble in a pipeline. The simulations were tested for the grid and time step convergence, and validated with the experimental and theoretical results for the main hydrodynamic characteristics of the Taylor bubble, i.e., bubble shape, terminal velocity of bubble, and the liquid film velocity. The slug flow was simulated with various air and water injection velocities in the pipeline. The simulations revealed the effect of slug flow as the pressure occurring in the wall of the pipeline. The peak pressure and pressure oscillations were observed, and those magnitudes and trends were compared with the change in air and water injection velocities. The mechanism of the peak pressures was studied in relation with the change in bubble length, and the maximum peak pressures were investigated for the different positions and velocities of the air and water in the pipeline. The pressure oscillations were investigated in comparison with the bubble length in the pipe and the oscillation was provided with the application of damping. The pressures were compared with the case of a bent pipe, and a 1.5 times higher pressures was observed due to the compression of the bubbles at the corner of the bent. These findings can be used as a basic data for further studies and designs on pipeline systems with multi-phase flow.