한국수소및신에너지학회논문집 (Transactions of the Korean hydrogen and new energy society)

  • 제30권1호
  • /
  • Pages.83-94
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  • 2019
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  • 1738-7264(pISSN)
  • /
  • 2288-7407(eISSN)
한국수소및신에너지학회 (The Korean Hydrogen and New Energy Society)
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프로판과 부탄 분리를 위한 고효율 분리벽형 증류탑 설계

Design of High-Efficient Divided Wall Distillation Columns for Propane and Butane Separation

  • 김남근 (연세대학교 대학원 엔지니어링융합학과) ;
  • 류현욱 (연세대학교 대학원 엔지니어링융합학과) ;
  • 강성오 (도프텍) ;
  • 오민 (한밭대학교 화공생명공학과) ;
  • 이창하 (연세대학교 대학원 엔지니어링융합학과)
  • KIM, NAMGEUN (Gradudate School of Integrated Engineering, Yonsei University) ;
  • RYU, HYUNWOOK (Gradudate School of Integrated Engineering, Yonsei University) ;
  • KANG, SUNGOH (DOFTECH Corp.) ;
  • OH, MIN (Department of Chemical and Biological Engineering, Han-bat University) ;
  • LEE, CHANGHA (Gradudate School of Integrated Engineering, Yonsei University)
  • 투고 : 2018.01.03
  • 심사 : 2019.02.28
  • 발행 : 2019.02.28
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초록

LPG is increasingly being used as a clean energy source due to the continuous strengthening of environmental regulations. In addition, the demand of propane which is the basic compound for petrochemicals is increasing for propylene production. In the study, a divided wall column was used as de-propanizer and de-butanizer, which is expected to save large amount of energy among the four conventional distillation columns used for processing LPG. The simulation results showed a decrease of energy duty with ESI by 30.30% using two divided wall columns. Furthermore, simulation case studies were carried out with respect to design and operation condition. The main column tray and withdrawal tray were determined from the design case studies while the internal liquid flow and vapor flow were decided from the operating case studies. Also, ESI of 1.06% could be achieved from the case studies. According to the results, the simulation method used showed that it is greatly helpful to the design and evaluate a highly efficient divided wall column.

키워드

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Fig. 1. Column Thermodynamic Inefficiency for separatingmidpoint component in indirect sequence (component B:mid-point component)6)

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Fig. 2. Schematic of LPG process

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Fig. 3. Comparing simulated product mole fraction to reference4,18)

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Fig. 4. Schematic diagram of a divided wall column

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Fig. 5. Design flow diagram for a divided wall column

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Fig. 6. Equivalent simple column configuration to divided wallcolumn

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Fig. 7. Schematic of a divided wall column diagram for simulation

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Fig. 8. Composition by tray position in a divided wall column

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Fig. 9. Three-dimensional plot of duties between operationvariables of vapor flow and liquid flow

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Fig. 10. Case study results for efficient liquid flow

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Fig. 11. Case study results for efficient vapor flow

Table 1. Total feed & de-methanizer feed conditions

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Table 2. Material balance of LPG process

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Table 3. Operating result in a divided wall column

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Table 4. Case study result in efficient number of tray (case study 1: base A, case study 2: base B)

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Table 5. Case study result in withdraw tray

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Table 6. Case study result in internal liquid flow

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Table 7. Case study result in internal vapor flow

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