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천연가스 정제를 위한 에탄제거 공정의 최적 설계
An Optimal Design of Deethanizer Column for Natural Gas Separation
HWAHAK KONGHAK, April 1998, 36(2), 336-342(7), NONE
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Abstract
본 연구는 새로운 공정 구조에 기초한 천연가스 처리 공정의 에탄제거탑 최적 설계에 대하여 수행하였다. 저온, 고압에서 초임계 상태에 이르는 저비점 유분들의 열역학적 성질을 정확히 구하기 위하여 Peng-Robinson 식의 alpha formulation 상수 값을 공정 및 운전 데이터를 사용하여 구하였다. 수정된 Peng-Robinson 식은 실 운전 자료와 비교하여 에러가 약 3% 미만으로 나타나 공정 모사에 적절히 사용될 수 있다. 기존의 공정과 제안된 최적 공정에 대하여 각각 공정 모사를 수행하였으며, pinch technology 기법을 사용하여 냉각 시스템의 에너지 절약에 대하여서도 논하였다. 모사 결과를 바탕으로 각 공정에 대한 투자비를 US Houston Gulf Coast에 기초하여 산출하였으며 사용된 유틸리티 양에 따라 운전비용을 계산하였다. 위의 결과를 바탕으로 하여 두 공정간의 장단점을 비교 검토하였으며 제안된 공정이 기존의 공정에 비하여 투자비 측면에서 약 12.4%, 운전비는 약 10.2% 절감되는 것으로 나타났다.
The research is carried out for the optimal design of deethaniser process for natural gas separation. In order to calculate physical properties of low boiling components in supercritical state at normal operating conditions, Peng-Robinson equations are modified based on the design and operating data. The physical properties from the modified Peng-Robinson equation shows less than 3% deviation comparing with actual design and operation data. Steady state simulation is performed for conventional deethanizer process as well as optimal deethanizer process using PRO/II. From the view point of energy saving, pinch technology is utilized to evaluate capacity of cold box system. Using the simulation results, capital cost for each process is evaluated based on US Houston Gulf Cost and operating cost is calculated in the basis of utility consumed. As a result, the capital cost and operating cost for the proposed process is reduced 12.3% and 10.2% respectively.
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References
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Crum FS, Dryer JK, Oil Gas J., 25, 94 (1994)
Gas Processors Association: "Engineering Data Book," Section 25 (1994)
Glitsch: "Ballast Tray Design Manual," Dallas (1989)
Simulation Science Inc.: "PRO/II ver 3.2," Steady State Simulator, Houston (1992)
Linhoff March Inc.: "SuperTarget ver 3.108, Optimization using Pinch Technology," UK (1994)
Icarus Co.: "Icarus Process Evaluator," Costing & Sizing Program, Maryland (1995)
Denton RD, Rule DD, Energy Prog., 5, 40 (1985)
White RR, Brown GG, Ind. Eng. Chem., 37, 1162 (1942)
Reid RC, Prausnitz JM, Poling BE, "The Properties of Gases and Liquids," McGraw-Hill, New York (1988)
Peng DY, Robinson DB, Ind. Eng. Chem. Fundam., 15, 59 (1976)
Kwak C, Anderson TF, Korean J. Chem. Eng., 8(2), 88 (1991)
Kister HZ, "Distillation Design," McGraw-Hill, New York (1992)
