Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Profile Position Control of Extractive Thermally Coupled Distillation System

추출 열 통합 증류계의 프로필 위치 제어

  • Cho, Hoon (Department of Chemical Engineering, Chungnam National University) ;
  • Choi, Yu-Mi (Department of Chemical Engineering, Chungnam National University) ;
  • Lee, Jin-Hong (Department of Chemical Engineering, Chungnam National University) ;
  • Cho, Im-Pyo (Department of Chemical Engineering, Chungnam National University) ;
  • Han, Myung-Wan (Department of Chemical Engineering, Chungnam National University)
  • 조훈 (충남대학교 화학공학과) ;
  • 최유미 (충남대학교 화학공학과) ;
  • 이진홍 (충남대학교 화학공학과) ;
  • 조임표 (충남대학교 화학공학과) ;
  • 한명완 (충남대학교 화학공학과)
  • Received : 2012.03.17
  • Accepted : 2012.07.23
  • Published : 2012.10.01
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Abstract

Extractive distillation system can be used when the components to be separated have close boiling points or form azeotropes. Extractive distillation is one of the most important and widely used separation methods in chemical process industry. The main disadvantage of the distillation is its high-energy requirements. Thermally coupled distillation system (TCDS) can provide significant savings in energy consumption and capital cost over the operation of sequences based on conventional distillation column. Despite such advantages of the thermally coupled distillation system, the process is not widely used in industry because control and operation of the column are difficult. In this study, we propose several control schemes for thermally coupled distillation system to overcome the difficulties and make the column stable when the process is confronted with feed disturbances. Profile position control scheme shows best control performance among the proposed control schemes.

분리할 성분들의 비점이 비슷하거나 공비를 형성하는 경우 일반적인 증류로 완전 분리가 불가능하다. 이를 극복하기 위하여 제 3성분을 가하여 상대 휘발도에 변화를 주는 추출 증류가 사용된다. 일반적으로 두 개의 증류탑으로 이루어진 추출 증류 공정이 사용되나 열 통합된 연속식 증류탑으로 이루어진 추출 열 통합 증류 공정은 보다 에너지 효율이 높고 장치비가 절감되는 장점을 가지고 있다. 그러나 추출 열 통합 증류 공정은 종래의 추출 증류 공정에 비하여 운전 및 제어가 어려워 널리 사용되지 못하고 있다. 본 논문에서는 이러한 단점을 극복할 수 있도록, 또한 외란에 대하여 안전한 조업이 이루어지도록 할 목적으로 최적 조업조건에서의 추출 열 통합 증류 공정의 운전 및 제어를 연구하였고 여러 가지의 제어 구조를 제안하였다. 제안된 제어구조 중에 프로필 위치 제어가 가장 좋은 제어 성능을 나타내었다.

Keywords

References

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