• 한국가스학회지
• /
• 제10권2호
• /
• pp.7-13
• /
• 2006

화학공정에서 안전하고 최적화된 조작과 내재되어 있는 화재 및 폭발 위험성 평가를 위해서는 연소특성치를 알아야 한다 폭발한계, 연소열, 화염온도, 폭발한계의 온도의존성은 가연성물질의 화재 및 폭발위험성을 결정하는데 중요한 연소특성치이다. 본 연구의 목적은 알킬케톤에 대한 연소특성치들의 상관관계와 폭발하한계의 온도의존성 고찰에 있다. 문헌자료를 이용하여 알킬케톤의 폭발특성치간의 상관관계를 묘사하는 경험식을 제시하였다. 또한 폭발하한계의 온도의존성을 예측위해 통계적 및 수학적 방법을 사용하여 새로운 식을 제시하였다. 제시된 예측식에 의한 예측값은 문헌값과 적은 오차범위에서 일치하였다. 제시된 방법론을 사용하여 다른 가연성 물질의 폭발한계 예측이 가능해졌다.

• 한국가스학회지
• /
• 제26권5호
• /
• pp.58-65
• /
• 2022

Gas explosion accidents could cause a catastrophe. we need specialized and systematic accident investigation techniques to shed light on the cause and prevent similar accidents. In this study, we had performed LPG explosion simulation using AUTODYN which is the commercial explosion program and predicted the damage characteristics of the structures by LNG explosive power. In the first step, we could get LPG's physical and chemical explosion properties by calculation using TNT equivalency method. And then, by applying TNT equivalency value about the explosion limit concentration of LPG on the 2D-AUTODYN simulation, we could get the explosion pressure wave profiles (explosion pressure, explosion velocity, etc.). In the last step, we performed LPG explosion simulation by applying to the explosion pressure wave profiles as the input data on the 3D-AUTODYN simulation. As a result, we had performed analyzing of the explosion characteristics of LPG in accordance with concentration through the 3D-AUTODYN simulation in terms of the explosion pressure behavior and structure destruction and damage behavior. The analyses showed that the generated stresses of the structures were lower than the compressive strengths in cases 1(two lane) and 2(four lane), while the generated stress in case 3(six lane) was 8.68e3 kPa, which exceeded the compressive strength of 5.89e3 kPa.

• 한국안전학회지
• /
• 제19권4호
• /
• pp.150-154
• /
• 2004

실린더형의 내용적 6리터의 용기를 이용하여 수소와 액화석유 가스(LPG)의 폭발 특성을 측정하였고 270리터의 직육면체 용기를 이용하여 폭발 후 화재로의 전이 현상을 실험하였다. 폭발 특성은 strain type 압력센서를 사용하여 측정하였으며 폭발 후 화재로의 전이 현상은 고속카메라로 촬영하여 분석하였다. 실험 결과 완전 연소 농도 비보다 약간 높은 농도에서 최대 폭발압력을 나타내었다. 폭발압력 상승 속도와 화염 전파속도는 연소속도와 비례함을 알 수 있었으며 이러한 폭발 특성들은 폭발 후 화재로의 전이에 영향을 미침을 알 수 있었다. 또한 폭발 화염온도, 화염의 용기 내 체류시간 등도 폭발 후 화재로의 전이에 중요한 변수가 됨을 알 수 있었다.

• 한국안전학회지
• /
• 제31권4호
• /
• pp.55-63
• /
• 2016

A dust explosion is a phenomenon of strong blast wave propagation involving destruction which results from dust pyrolysis and rapid oxidation in a confined space. There has been some research done to find individual explosion characteristics and common physical laws for various dust types. However, there has been insufficient number of studies related to the heat of combustion of materials and the oxygen consumption energy about materials in respect of dust explosion characteristics. The present study focuses on the relationship between dust explosion characteristics of wood dust samples and oxygen consumption energy. Since it is difficult to estimate the weight of suspended dust participating in explosions in dust explosion and mixtures are in fuel-rich conditions concentrations with equivalent ratios exceeding 1, methods for estimating explosion overpressure by applying oxygen consumption energy based on unit volume air at standard atmospheric pressure and temperature are proposed. In this study an oxygen consumption energy model for dust explosion is developed, and by applying this model to TNT equivalent model, initial explosion efficiency was calculated by comparing the results of standardized dust explosion experiments.

• 한국통신학회논문지
• /
• 제33권10C호
• /
• pp.844-850
• /
• 2008

본 논문에서는 지하 암반을 타고 전달된 인공발파음 특성을 규명하기 위해 제안한 알고리즘에 대해 기술한다. 지하 암반 매질을 통과한 인공발파음은 다중전달경로 현상과 지질의 불균일 등으로 인해서 거리증가에 따라 고주파 대역에서 감쇠가 발생한다. 본 논문에서는 제안한 알고리즘 성능검증을 위해 지하터널에서 발파 실험을 하였고 수집한 데이터를 가지고 지하암반을 통과한 채널에서 특징 파라미터를 추출하여 수치적으로 정량화함으로써 인공발파음 특성을 규명하였다.

• 한국분무공학회지
• /
• 제9권3호
• /
• pp.29-34
• /
• 2004

To investigate characteristics and micro-explosion of single-droplets of emulsified fuel, water is mixed with diesel oil by using ultrasonic energy fuel feeding system. The fuel characteristics is analysed through H-NMR spectrum and micro-explosion phenomena of the emulsified fuel is also investigated. The life times of droplets of conventional diesel fuel, ultrasonic energy added diesel fuel and emulsified fuel we obtained additionally. According to this study, the micro-explosion phenomena of single-droplets happen in atmospheric pressure condition, a curve form of emulsified fuel's life tim is different from diesel fuel's one and the change of chemical structures is a cause of ultrasonic-energy-added diesel fuel effect.

• 한국안전학회지
• /
• 제15권4호
• /
• pp.95-100
• /
• 2000

This study was performed in Hartmann type dust explosion apparatus in order to research the dust explosion characteristics of hydroxypropyl methyl cellulose(HPMC): minimum explosive limit, minimum ignition energy, limiting oxygen concentration, maximum explosion pressure, rate of pressure rise, etc. The samples of HPMC dust were distributed into 120-140 mesh, 170-230 mesh and 325 under, and the gap distance of the discharge electrode was setted up at 5mm. The experimental results were obtained as follows: (1) The minimum explosive limit for HPMC dust was founded at 180g/㎥. the minimum ignition energy at 9.8mJ and the limiting oxygen concentration at 12%. (2) The maximum explosion pressure of HPMC dust was $8.1kg/cm^2\;{\cdot}\;$abs at the concentration of $500g/m^3$ and the maximum rate of pressure rise was 203.98 bar/sec at the concentration of $480g/m^3$ for 325 under.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2001년도 춘계학술대회논문집E
• /
• pp.51-56
• /
• 2001

Vapor explosion is one of the most important problems encountered in severe accident management of nuclear power plants. In spite of many efforts, a lot of questions still remain for the fundamental understanding of vapor explosion phenomena. Therefore, KAERI launched a real material experiment called TROI using 20 kg of UO2 and ZrO2 to investigate the vapor explosion phenomena. In addition, a small-scale experiment with molten-tin/water system was performed to quantify the characteristics of vapor explosion and to understand the phenomenology of vapor explosion. A number of instruments were used to measure the physical change occurring during the vapor explosion. In this experiment, the vapor explosion generated by molten fuel water interaction is visualized using high speed camera and the pressure behavior accompanying the explosion is investigated.

• 한국안전학회지
• /
• 제20권3호
• /
• pp.71-77
• /
• 2005

This study aims to find the safe vent area to prevent a destruction of building by gas explosion in a building. Explosion vessel which used in this experiment is 1/5 scale down model of simple livingroom and its dimension is 100cm in length 60cm in width and 45cm in height. Liquified petroleum gas(LPG) was injected to the vessel to the concentration of 4.5vol%, and injection rate were varied in 1L/min or 4L/min. Gas mixture was ignited by the 10kV electric spark. For analysis the characteristics of vented explosion pressure according to the vent size and vent shape, its size and shape were varied. From the experiment, it was found that explosion pressure in the vented explosion :in affected by the gas injection rate, vent area and vent shape. And the vent area to volume ratio(S/V) to prevent the building destruction by explosion pressure, it is recommended that the design of vent area happened by the explosion should be above 1/500cm in S/V. And if the vent area has complicate structure in same area, vented explosion pressure will be higher than a single vent, and possibility of building destruction will increase. Therefore to effectively vent the explosion pressure for protect a building and residents from the gas explosion hazards, the same vent area should have a singular and constant shape in the cross-sectional area of the vessel.

• 대한안전경영과학회지
• /
• 제19권2호
• /
• pp.31-39
• /
• 2017

Classify of explosion hazardous areas must be made at the site where flammable materials are used. This reason is that it is necessary to manage ignition sources in of explosion hazardous areas in order to reduce the risk of explosion. If such an explosion hazard area is widened, it becomes difficult to increase the number of ignition sources to be managed. The method using the virtual volume currently used is much wider than the result using CFD(Computational Fluid Dynamics). Therefore, we tried to improve the current method to compare with the new method using leakage characteristics. The result is a realistic explosion hazard if the light gas is calibrated to the mass and the heavy gas is calibrated to the lower explosion limit. However, it is considered that the safety factors should be taken into account in the calculated correction formula because such a problem should be considered as a buffer for safety.