Journal of the Korean Institute of Gas (한국가스학회지)

The Korean Institute of GAS (한국가스학회)
권호 표지
DOI QR코드

DOI QR Code

A Study of Mixed Refrigerant Process Control in Liquefied Natural Gas Process using Dynamic Simulation

동적 모사를 이용한 천연가스 액화 공정에서 혼합냉매 공정 제어 연구

  • 이재용 (고등기술연구원 플랜트엔지니어링 본부) ;
  • 박찬국 (고등기술연구원 플랜트엔지니어링 본부)
  • Received : 2015.10.02
  • Accepted : 2015.12.24
  • Published : 2015.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

Today the most efficient way to transport the natural gas is carried via the liquid. In order to liquefy the natural gas to be cooled to $-160^{\circ}C$ or less. Cooling method has a number of different ways. In this paper, we studied control method for the representative liquefaction process, C3MR. Natural gas liquefaction control is a tool that can maintain the quality of natural gas is a means to ensure stable operation. Analyzing the C3MR process, and select the control parameters for the control valve. We find control structure for mixed refrigerant cycle through the step response. A control result obtained through the dynamic simulation arbitrarily given a disturbance was found to maintain a steady-state results.

천연가스의 이송을 위해 현재까지 가장 효율적인 방법은 액화를 통한 운반이다. 천연가스를 액화하기 위해서는 $-160^{\circ}C$이하로 냉각시켜야 하는데, 그 방법에는 여러 가지가 있다. 본 논문에서는 가장 대표적인 액화 공정인 C3MR 공정에 대한 제어 방법에 대해 연구하였다. 천연가스 액화 공정의 제어는 천연가스 품질을 유지할 수 있는 도구이며 안정된 운전을 보장하는 수단이다. C3MR 공정을 분석하고 제어 밸브에 대한 제어 변수를 선택하고 제어 변수의 계단 응답 결과를 통해 혼합냉매의 제어 구조를 도출 하였다. 도출된 제어 결과를 동적 모사를 통해서 임의로 외란을 주어 정상상태를 유지하는 결과를 확인 하였다.

Keywords

References

  1. Lu, T. and Wang, K.s.,, Analysis and optimization of cascading powor cycle with liquefied natural gas(LNG) cold energy recovery, Applied thermal Engineering, Vol. 29, No. 8-9, 1478-1484, (2009) https://doi.org/10.1016/j.applthermaleng.2008.06.028
  2. Liu, M., Lior, N., Zhang, N. and Han, W., Thermoeconomic analysis of a novel zero-CO2-emission high-efficiency power cycle using LNG coldness, Energy Conversion and Management, Vol. 50, No. 11, 2768-2781, (2009) https://doi.org/10.1016/j.enconman.2009.06.033
  3. Arthur J. Kidnay, William R. Parrish, Fundamentals of Natural Gas Processing, 1, 289, CRC press, Boca Raton. (2006)
  4. Nogal, F.D., Kim, J.K, Perry, S. and Smith, R., Optimal design of mixed refrigerant cycles, Industrial and Engineering Chemistry Research, Vol. 47, No. 22, 8274-8740, (2008)
  5. Lee, G.C., Smith, R. and Zhu, X.X., Optimal synthesis of mixed-refrigerant systems for low temperature process", Industrial and Engineering Chemistry Research, Vol. 41, No. 20, 5016-5028, (2002) https://doi.org/10.1021/ie020057p
  6. A Global Market, LNG Industry, Autumn, (2006)
  7. M. J. Roberts and Y. N. Liu and J. C Bronfenbrenner, Reducing LNG Capital Cost in Today's Competitive Environment, 14th International Comference & Exhibition on Liquefied Natural Gas(LNG 14), PS2-6, 1-12, Doha-Qatar, (2004)
  8. Patel, N.C. and Teja, A.S., A new cubic equation of state for fluids and fluid mixtures, Chemical Engineering Science, Vol. 37, No. 3, 463-473, (1985) https://doi.org/10.1016/0009-2509(82)80099-7
  9. Lee, M. J. and Sun, H. C., Thermodynamic property prediction for refrigerant mixtures, Industrial and Engineering Chemistry Research, Vol. 31, No. 4, 1212-1216, (1992) https://doi.org/10.1021/ie00004a036
  10. Peng, D.Y. and Robinson, D.B., A new twoconstant equation of state, Industrial and Engineering Chemistry Fundamentals, Vol. 15, No. 1, 59-64, (1976) https://doi.org/10.1021/i160057a011