scholarly journals Controllability Comparison of the Four-Product Petlyuk Dividing Wall Distillation Column Using Temperature Control Schemes

Processes ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 116 ◽  
Author(s):  
Xing Qian ◽  
Rui Liu ◽  
Kejin Huang ◽  
Haisheng Chen ◽  
Yang Yuan ◽  
...  
Keyword(s):  
Temperature Control ◽  
Temperature Difference ◽  
Feed Rate ◽  
Distillation Column ◽  
Process Intensification ◽  
Distillation Columns ◽  
Operation Costs ◽  
Control Scheme ◽  
Control Schemes ◽  
Dynamic Performances

An effective process intensification strategy based on dividing walls shows promising energy-saving results for distillation processes. The three-product Petlyuk dividing wall distillation columns (DWDCs) are able to save approximately 30% energy in comparison with the traditional distillation columns. Furthermore, the four-product extended Petlyuk DWDC reduces about 50% of operation costs than conventional distillation sequences. Although researchers have extensively studied control schemes for the three-product Petlyuk DWDC, relatively little work has been done on the four-product extended Petlyuk DWDC. This paper studies feasible temperature control schemes containing temperature control scheme (TC), simplified temperature difference control scheme (STDC), and simplified double temperature difference control scheme (SDTDC) for the four-product extended Petlyuk DWDC. STDC and SDTDC are introduced so as to improve the dynamic performances with simple control schemes. All three control schemes are tested against a series of feed compositions and feed rate disturbances. Dynamic performances prove that the proposed STDC and SDTDC schemes are better at handling the inserted feed disturbances. These are very encouraging results for industrialization of the four-product extended Petlyuk DWDC in the future.

Effective Derivation of Asymmetrical Temperature Control Schemes for Dividing-Wall Distillation Columns

2020 ◽  
Vol 59 (5) ◽  
pp. 2036-2048 ◽  
Author(s):  
Yang Yuan ◽  
Kejin Huang ◽  
Haisheng Chen ◽  
Xing Qian ◽  
Lijing Zang ◽  
...  
Keyword(s):  
Temperature Control ◽  
Distillation Columns ◽  
Control Schemes

scholarly journals Comparison of Temperature Control and Temperature Difference Control for a Kaibel Dividing Wall Column

Processes ◽  
2019 ◽  
Vol 7 (10) ◽  
pp. 773 ◽  
Author(s):  
Xing Qian ◽  
Rui Liu ◽  
Kejin Huang ◽  
Haisheng Chen ◽  
Yang Yuan ◽  
...  
Keyword(s):  
Temperature Control ◽  
Temperature Difference ◽  
Capital Investment ◽  
Temperature Sensors ◽  
Distillation Process ◽  
Control Structures ◽  
Dividing Wall Column ◽  
Dynamic Performances ◽  
Two Temperature ◽  
Better Than

A dividing wall column (DWC) effectively intensifies the distillation process with a reduced energy consumption, capital investment, and space. The three-product DWC has been investigated intensively and extensively; however, the four-product Kaibel DWC has received scarce attention. This study aimed to propose feasible control structures for the Kaibel DWC using only temperature sensors in order to promote its industrialization. Two temperature control structures, two temperature difference control structures, and two double temperature difference control structures were studied. The feasibility of the six proposed control structures was verified with a wide variety of feed disturbances. In most cases, temperature difference control was better than temperature control to maintain product purities. The dynamic performances proved that the inserted feed disturbances were handled well. These results help to promote the industrialization of the Kaibel DWC.

Configuring Effectively Double Temperature Difference Control Schemes for Distillation Columns

2017 ◽  
Vol 56 (32) ◽  
pp. 9143-9155 ◽  
Author(s):  
Yang Yuan ◽  
Kejin Huang ◽  
Haisheng Chen ◽  
Liang Zhang ◽  
Shaofeng Wang
Keyword(s):  
Temperature Difference ◽  
Distillation Columns ◽  
Control Schemes

scholarly journals Design of Effective Control Schemes for Binary Distillation Columns

2017 ◽  
Vol 2 (4) ◽  
pp. 248-254
Author(s):  
Riad BENDIB ◽  
Noual BATOUT ◽  
Abdelmajid KHELASSI
Keyword(s):  
Distillation Column ◽  
Material Balance ◽  
Relative Magnitude ◽  
Effective Control ◽  
Distillation Columns ◽  
Oil Refineries ◽  
Disturbance Propagation ◽  
Control Schemes ◽  
The World ◽  
Energy Equipment

Distillation column is very important and high consuming energy equipment in oil refineries, such that 3% of the energy consumption in the world is allocated in distillation column. The fact that let controlling the distillation column an attractive field for researcher, and hence different control schemes are proposed by researchers. In this paper we will provide a comparative study between different control schemes for a binary distillation column two simple configurations (the most known ones) (LV&DV) and two more complicated ones ((L/D,V/B) & Ryskamp’s) we compare them in the basis of interactions and disturbance propagation. The mathematical models for the material balance configurations for the considered configurations are deduced using mathematical transformations (in the paper the general case of transformation between any two configurations is presented), taking the conventional configuration (LV) as a based configuration, the Dynamic Relative Magnitude Criterion (DRMC) is used to assess the interactions and disturbance propagation. The results show that the ratios control schemes are less sensitive to interactions compared with energy balance configuration LV. The same was noticed with DV configuration however other process drawbacks let it not recommended in industrial field.

scholarly journals Evaluation of mechanical vapor recompression in the reactive distillation of the N-butanol esterification process

2021 ◽  
Vol 10 (12) ◽  
pp. e243101220345
Author(s):  
Danyelle Fialho de Souza Rodrigues ◽  
Arthur Siqueira Damasceno ◽  
Wagner Brandão Ramos ◽  
Romildo Pereira Brito ◽  
Karoline Dantas Brito
Keyword(s):  
Distillation Column ◽  
Butyl Acetate ◽  
Reactive Distillation ◽  
Waste Heat ◽  
Process Intensification ◽  
Point Of View ◽  
The Other ◽  
Distillation Process ◽  
Distillation Columns ◽  
Vapor Recompression

The process of producing esters is usually performed through esterification in a reactor followed by a distillation column to separate the products. However, this design limits the reagent conversion. Reactive distillation is an alternative to get around this issue as it allows greater reagent conversions in reactions limited by chemical equilibrium. It is one of the most famous process intensification techniques. On the other hand, mechanical vapor recompression has been used to recycle waste heat to improve efficiency of conventional distillation columns. In this context, this work evaluated the inclusion of a mechanical vapor recompression system in a reactive distillation process to obtain n-butyl acetate via n-butanol esterification with acetic acid. Systems with and without recompression were simulated in an Aspen Plus™ environment. The addition of recompression resulted in a reduction of 33.65% in the annual cost of the process, while not significantly affecting the purity of the desired product and the reagents’ conversion. From an environmental point of view, the mechanical vapor recompression system adoption resulted in a 12.69% reduction in CO2 emissions, contributing positively to meeting the requirements of the environmental regulations.

scholarly journals Nonlinear Current-Mode Control of SCIG Wind Turbines

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 55
Author(s):  
Nicholas Hawkins ◽  
Bhagyashri Bhagwat ◽  
Michael L. McIntyre
Keyword(s):  
Current Mode ◽  
Nonlinear Controller ◽  
Flux Observer ◽  
Current Mode Control ◽  
Mode Control ◽  
Squirrel Cage ◽  
Control Scheme ◽  
Control Schemes ◽  
Rotor Flux ◽  
Squirrel Cage Induction Generator

In this paper, a nonlinear controller is proposed to manage the rotational speed of a full-variable Squirrel Cage Induction Generator wind turbine. This control scheme improves upon tractional vector controllers by removing the need for a rotor flux observer. Additionally, the proposed controller manages the performance through turbulent wind conditions by accounting for unmeasurable wind torque dynamics. This model-based approach utilizes a current-based control in place of traditional voltage-mode control and is validated using a Lyapunov-based stability analysis. The proposed scheme is compared to a linear vector controller through simulation results. These results demonstrate that the proposed controller is far more robust to wind turbulence than traditional control schemes.

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