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Separating Mixture Glycols in DWC with Flow Rate-Composition Cascade Control Structure. J CHEM-NY 2022. [DOI: 10.1155/2022/3915508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Dividing wall column (DWC) is an advanced technology which could decrease energy consumption. As the vertical wall inserted in DWC increases the degree of freedom of systems, the control becomes more difficult than the conventional columns. In this study, the mixture glycols (1, 2-propanediol+ 1, 3-butanediol+ 1, 4-butanediol) were taken as feed, an optimized DWC structure was proposed, and three control structures for DWC were tested by ± 10% feed disturbances. The temperature control structure (CS1) was hard to control the system while composition control structure (CS2) and flow rate-composition cascade control structure (CS3) had good performance on controlling the DWC. It showed that CS3 was superior to CS2, as CS3 could stabilize the DWC within 4 hours, and the maximum deviations of the three products, namely 1, 2-propanediol, 1, 3-butanediol and 1, 4-butanediol, were 0.07%, 1.44%, and 0.46% respectively, while CS2 could realize the stability within 7 hours, and the corresponding numbers were 0.35%, 2.78%, and 0.41%, respectively.
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2
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Chen C, Lu J. Nonlinear Multivariable Control of a Dividing Wall Column Using a Different-Factor Full-Form Model-Free Adaptive Controller. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.1c04500] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Chen Chen
- State Key Laboratory of Industrial Control Technology, College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Jiangang Lu
- State Key Laboratory of Industrial Control Technology, College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China
- Zhejiang Laboratory, Hangzhou 311121, China
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Impact of Various Feed Properties on the Performance of a Control System for a Multiple Dividing Wall Column Pilot Plant. CHEMENGINEERING 2021. [DOI: 10.3390/chemengineering5020029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Despite the attractive savings potential of multiple Dividing Wall Columns (mDWC), there are no reports in the open literature of an existing application so far. In this perspective, the control of mDWCs has been a rather little-investigated field. Pilot plants are a necessary step needed to further expand the application window of this sustainable distillation technology. This contribution aimed to show that mDWCs are sufficiently flexible, providing stable operation, even with suboptimal control structures arising from design limitations imposed by equipment. For this purpose, the pilot column design was assessed using dynamic simulation to evaluate its operability in case of different disturbances as well as different feed mixtures. The results showed that, in all cases, the column could be stabilized and product purities maintained. This suggests that even complex configurations such as mDWCs offer sufficient amount of flexibility to allow for the application of one design in different services.
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Walk M, Hamacher J, Downs JJ, Miller SM, Owens S, Eldridge RB. Validation of Differential Temperature Control for a Dividing Wall Distillation Column. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.0c04570] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mitchell Walk
- Process Science Technology Center, The University of Texas at Austin, Austin, Texas 78712, United States
| | | | - James J. Downs
- Eastman Chemical Company, Kingsport, Tennessee 37660, United States
| | | | - Scott Owens
- Eastman Chemical Company, Kingsport, Tennessee 37660, United States
| | - R. Bruce Eldridge
- Process Science Technology Center, The University of Texas at Austin, Austin, Texas 78712, United States
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Preißinger U, Lukač G, Dejanović I, Grützner T. Investigation of Control Structures for a Four‐Product Laboratory Multiple Dividing‐Wall Column Using Dynamic Simulation. Chem Eng Technol 2020. [DOI: 10.1002/ceat.202000557] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ulrich Preißinger
- Ulm University Laboratory of Thermal Process Engineering, Institute of Chemical Engineering Albert-Einstein-Allee 47 89081 Ulm Germany
| | - Goran Lukač
- University of Zagreb Faculty of Chemical Engineering and Technology Marulićev trg 19 10000 Zagreb Croatia
| | - Igor Dejanović
- University of Zagreb Faculty of Chemical Engineering and Technology Marulićev trg 19 10000 Zagreb Croatia
| | - Thomas Grützner
- Ulm University Laboratory of Thermal Process Engineering, Institute of Chemical Engineering Albert-Einstein-Allee 47 89081 Ulm Germany
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