상온 상압의 이산화탄소 저장용 탱크를 위한 예냉과정의 비선형 모델링 및 비례-적분 제어 적용 = Nonlinear Modeling and Application of PI Control on Pre-cooling Session of a Carbon Dioxide Storage Tank at Normal Temperature and Pressure

다국어 초록 (Multilingual Abstract)

Storage tanks of Carbon dioxide (CO2) carriers utilized for the purpose of carbon capture and storage(CCS) into subsea strata have to undergo a pre-cooling session before beginning to load cryogenic liquid cargos inorder to prevent physical and thermal deterioration of tanks which may result from cryogenic CO2 contacting tankwalls directly. In this study we propose dynamic model to calculate the tank inflow of CO2 gas injected for precoolingprocess and its dynamic simulation results under proportional-integral control algorithm. We selected two cases inwhich each of them had one controlled variable (CV) as either the tank pressure or the tank temperature and discussedthe results of that decision-making on the pre-cooling process. As a result we demonstrated that the controllinginstability arising from nonlinearity and singularity of the mathematical model could be avoided by choosingtank pressure as CV instead of tank temperature.

참고문헌 (Reference)

1 정재흠, "모노에탄올아민(MEA)을 이용한 이산화탄소 포집공정: 배가스 분할 유입을 통한 흡수제 재생 에너지 절감 연구" 한국화학공학회 49 (49): 764-768, 2011

2 Kim, H. S., "Optimization of Operating Procedure of LNG Storage Facilities Using Rigorous BOR Model" 2008

3 En Sup Yoon, "Optimal operation of the boil-off gas compression process using a boil-off rate model for LNG storage tanks" 한국화학공학회 25 (25): 7-12, 2008

4 Shin, Y., "Design of a Boil-off Natural Gas Reliquefaction Control System for LNG Carriers" 86 (86): 37-44, 2009

5 Benson, S. M., "Carbon Dioxide Capture and Storage" 33 (33): 303-305, 2008

6 Feron, P. H. M., "CO2 Capture Process Principles and Costs" 60 (60): 451-459, 2005

7 Heestand, J., "A Predictive Model for Rollover in Stratified LNG Tanks" 29 (29): 199-207, 1983

8 Lee, D. H., "A Parametric Sensitivity Study on LNG Tank Sloshing Loads by Numerical Simulations" 34 (34): 3-9, 2007

9 Dimopoulos, G. G., "A Dynamical Model for Liquefied Natural Gas Evaporation during Marine Transportation" 11 (11): 123-131, 2008