GERG-2004 모델식과 Peng-Robinson 상태방정식을 이용한 천연가스 및 냉매 구성성분들의 물성 비교연구

국문 초록 (Abstract)

본 연구에서는 천연가스 및 냉매를 구성하고 있는 성분들에 대한 증기압, 증발잠열, 액상의 밀도 및 이성분 계 기액 상평형을 추산하는데 있어서 GERG-2004 모델식과 Peng-Robinson(PR) 상태방정식을 서로 비교하였다. 비교 결과 GERG-2004모델식은 액상의 밀도 추산에 있어서 PR 상태방정식에 비해 정확성이 높았으나, 기액 상평형 추산 에 대한 정확성은 오히려 낮았다. 한편, PR 상태방정식에서 Costald 상관 관계식을 사용하여 액상의 밀도를 추산한 경우에는 실험값과 오차율이 1% 이내로써 GERG-2004 모델식을 사용한 추산 결과와 거의 차이가 없었으며, 증기압 과 증발 잠열의 추산은 GERG-2004모델식과 PR 상태방정식이 거의 유사한 결과를 나타냄을 알 수 있었다.

다국어 초록 (Multilingual Abstract)

In this study, we compared with results simulated by EOS(Equation of State) using Peng-Robinson model and GERG-2004 model for estimating vapor pressure, latent heat of vaporation, liquid density, and binary isotherm vapor-liquid equilibrium on pure components composing natural gases. We obtained the simulated results that while EOS using GERG-2004 model is more accurate than EOS using Peng-Robinson model for estimating liquid density, but rather it is less accurate for estimating binary isotherm vapor-liquid equilibrium. On the other hand, the use of Costald model in EOS using Peng-Robinson model for increasing more accuracy to calculate liquid density is almost same as EOS using GERG-2004 model within the error of 1 % compared with experimental data. Also, we confirmed that on the estimation of binary isotherm vapor-liquid equilibrium, EOS using GERG-2004 model is more accurate than EOS using Peng-Robinson model, but they are almost same.

참고문헌 (Reference)

1 T.S. Brown, "Vapor—liquid equilibria in the carbon dioxide-ethane system" 40 : 169-184, 1988

2 Prausnitz, J. M, Molecular, "Thermodynamics of Fluid Phase Equilibria" Prentice-Hall 2004

3 O. Kunz, "The GERG-2004 Wide-Range Equation of State for Natural Gases and Other Mixtures" Association of German Engineers 2007

4 L.A. Weber, "Simple apparatus for vapor-liquid equilibrium measurements with data for the binary systems of carbon dioxide with n-butane and isobutane" 34 : 171-175, 1989

5 R.H. Olds, "Phase Equilibria in Hydrocarbon Systems: the n-Butane-Carbon Dioxide System" 41 : 475-482, 1949

6 jungho Cho, "PRO/II with PROVISION using the simulation of chemical processes" AJin Book Publishing 2004

7 Xu, N., "High Pressure Vapor Liquid Equilibria at 293 K for Systems. Containing Nitrogen, Methane and Carbon Dioxide" 81 : 175-186, 1992

8 Carl L. Yaws, "Chemical Properties Handbook" McGraw-Hill 1999

9 R.W. Hankinson, "An Improved Correlation for Densities of Compressed Liquids and Liquid Mixtures" 28 : 671-676, 1982

10 Peng, D. Y., "A New Two-constant Equation of State for Fluids and Fluid Mixtures" 15 : 58-64, 1976

11 Twu, C.H., "A Cubic Equation of State with a New Alpha Function and New Mixing Rule" 69 : 33-50, 1991