이성분계 파라미터 최적화 기법을 활용한n-Propanol+Formic acid 계의 인화점 추산

하동명,이성진 한국화재소방학회 2008 한국화재소방학회논문지 Vol.22 No.4

An accurate knowledge of the flash point is important in developing appropriate preventive and control measures in industrial fire protection. The lower flash points for the n-propanol+formic acid system were measured by Pensky-Martens closed cup apparatus. This binary mixture exhibited MFPB (minimum flash point behavior), which leads to the minimum on the flash point vs composition curve. The Raoult's law and optimization method using Wilson equation were used to predict the lower flash points and were compared with experimental data. The calculated values based on the optimization method were found to be better than those based on the Raoult's law. 인화점의 정보를 확보하는 것은 화재 및 폭발의 예방을 위해 대단히 중요하다. 본 연구에서는 n-propanol+formic acid 계의 하부 인화점을 Penskey-Martens 밀폐식 장치를 이용하여 측정하였다. 이성분 계 혼합물은 최소 인화점 현상(MFPB)을 보였다. 실험값은 Raoult의 법칙과 최적화 기법에 의해 추산된 값과 비교하였다. 그 결과, 최접화 기법에 의한 추산값이 Raoult의 법칙에 의한 추산값 보다 실험값에 더 욱 근접하였다.

가연성물질의 자연발화온도 측정 및 예측 : 메탄올과 에탄올 Methanol and Ethanol

하동명 한국안전학회 2004 한국안전학회지 Vol.19 No.2

Flammable substances are frequently used chemical industry processes. An accurate knowledge of the AITs(Autoignition Temperatures) is important in developing appropriate prevention and control measures in industrial fire protection. The AITs describe the minimum temperature to which a substance must be heated, without the application of a flame or spark, which will cause that substance to ignite. The AITs are dependent upon many factors, namely initial temperature, pressure, volume, fuel/air stoichiometry, catalyst material, concentration of vapor, ignition delay. This study measured relationship between the AITs and the ignition delay times by using ASTM E659-78 apparatus for methanol and ethanol. The A.A.P.E.(Average Absolute Percent Error) and the A.A.D.(Average Absolute Deviation) of the experimental and the calculated delay times by the AITs for methanol were 14.59 and 1.76 respectively. Also the A.A.P.E. and the A.A.D. of the experimental and the calculated delay times by the ATIs for ethanol were 8.33 and 0.88.

Tag식 개방계 장치를 이용한 알콜류의 인화점 및 연소점 측정

하동명,이성진,송영호 한국안전학회 2004 한국안전학회지 Vol.19 No.4

The flash point is one of the most important combustible properties used to determine the potential for the fire and explosion hazards of industrial material and the fire point is the temperature of the flammable liquid at which there will be flaming combustion, sustained 5 seconds in response to the pilot flame. In this study, the flash point and fire point were measured to present raw data of the flammable risk assessment for alcohols, using Tag open-cup apparatus(ASTM D 1310-86). The measured values were compared with the calculated values based on 0.78 times stoichiometric concentration. The values calculated by the proposed equations were in good agreement with the measured values.

액체용액에서 활동도계수 모델의 열역학 및 통계역학적 고찰

하동명 慶熙大學校 材料科學技術硏究所 1991 材料科學技術硏究論集 Vol.4 No.-

Attempts are made to investigate the TPTT(two parameters two terms) equations to estimate the activity-coefficients of chemical solution from the solution thermodynamics and statistical mechanical theory. As the effect of molecular interaction among molecules in the soultion is largely significant, it is found that the TPTT equations in general have difficulties to express various multicomponent systems due to their excessive simplification based on solution theory. It is found that the parameters of the TPTT equations are varying with the concentration of a solution based on statistical mechanical local composition theory. This eventually leads us to seek a better method of estimating phase equilibria properties for non-ideal mixtures.

미국화학공학회의 직업윤리규정과 우리의 안전의식

하동명,Ha, Dong-Myeong 한국화재보험협회 2003 防災와 保險 Vol.99 No.-

노말알칸류와 방향족탄화수소류의 상부인화점 측정에 의한 폭발상한계의 예측

하동명 한국안전학회 2011 한국안전학회지 Vol.26 No.4

Explosion limit and flash point are the major combustion properties used to determine the fire and explosion hazards of the flammable substances. In this study, in order to predict upper explosion limits(UELs), the upper flash point of n-alkanes and aromatic compounds were measured under the VLE(vapor-liquid equilibrium) state by using Setaflash closed cup tester(ASTM D3278). The UELs calculated by Antoine equation and chemical stoichiometric coefficient tusing the experimental upper flash point were compared with the several reported UELs. From the given results, using the proposed experimental and predicted method, it is possible to research the upper explosion limits of the other flammable substances.

가연성물질의 폭발한계에 관한 연구 - 용액열역학 및 MRSM 모델에 의한 3성분계 폭발한계-

하동명 한국안전학회 2005 한국안전학회지 Vol.20 No.3

밀폐계 측정장치를 이용한 물-노말프로판올 계의 인화점

하동명,최용찬,이성진 한국산업안전학회 2002 한국안전학회지 Vol.17 No.4

The Flash Point is one of the most important combustible properties used to determine the potential for fire and explosion hazards of chemical materials. An accurate knowledge of the flash point is important in developing appropriated preventive and control measures in industrial fire protection. The lower flash points for the Water + n-Propanol systems were measured by using Pensky-Martens closed cup tester. The experimental data were compared with the values calculated by the laws of Raoult and van Laar equation. The calculated values based on the van Laar equation were found to be better than those based on the Raoult's law.

염화탄화수소의 화재 및 폭발 특성치 간의 상관관계

하동명 한국산업안전학회 2002 한국안전학회지 Vol.17 No.4

By using the reference data, the empirical equations which describe the interrelationships of explosion properties and physical properties of n-chlorinated hydrocarbons have been derived. The properties which have been correlated are the lower and upper explosive limits, the stoichiometric coefficients, the heats of combustion, the carbon numbers. Also the new equations using the mathematical and statistical methods for predicting the temperature dependence of lower explosive limits(LEL) of chlorinated hydrocarbons on the basis of the literature data are proposed. The fire and explosion properties calculated by the proposed equations in this research were a good agreement with literature data within a few A.A.P.E.(Average Absolute Percent Error) and A.A.D.(Average Absolute Deviation). From a given explosive properties, by using the proposed equations, it is possible to predict to the fire and explosion characteristics for the other chlorinated hydrocarbons.

가연성물질의 폭발한계에 관한 연구 : 알코올화합물의 폭발특성치 및 폭발한계의 온도의존성 예측 Prediction of Explosive Properties and Temperature Dependence of Explosive Limits for n - Alcohols

하동명 한국산업안전학회 1999 한국안전학회지 Vol.14 No.1

By using literature data, the empirical equations have been derived which describe the interrelationships of explosion and other related properties of n-alcohols. The properties which have been correlated data are : lower and upper explosive limits, heats of combustion, carbon numbers. Also, the new equation for predicting the temperature dependence of lower explosive limits(LEL) of n-alcohols on the basis of explosive limits, heats of combustion, flame propagation theory and mathematical method is proposed. The values calculated by the proposed equations were a good agreement with literature data within a few percent. From a given explosive properties, by using the proposed equations, it is possible to predict the other properties. It is hoped eventually that this method will permit the estimation of the explosive properties of alcohol with improved accuracy and the broader application for other compounds.