An energy‐efficient cost‐effective transient batch rectifier with bottom flashing: Process dynamics and control

Exploring an internal heat source through bottom flashing route, this work introduces a dynamic batch column configuration within the framework of mechanical heat pump system. This batch rectifier with bottom flashing (BRBF) scheme attempts to use the reboiler liquid as a heat exchanging medium in the overhead condenser, thereby avoiding the use of any external coolant stream and reducing the consumption of hot utility in the reboiler. Aiming to operate the proposed transient process unit at an optimal state of energy use, we formulate an online open-loop control policy that estimates the multiple control actions simultaneously. Furthermore, in order to achieve constant product purity, a gain-scheduled closed-loop control system is synthesized with keeping the stability margin constant. Simulating a multicomponent reactive system, the novel BRBF arrangement is evaluated in the aspects of energy savings and cost under both the open-loop and closed-loop control modes. © 2015 American Institute of Chemical Engineers AIChE J, 61: 3699–3707, 2015

[1]  Masaru Nakaiwa,et al.  Internally Heat-Integrated Distillation Columns: A Review , 2003 .

[2]  Bärbel Kolbe,et al.  Novel distillation concepts using one-shell columns , 2004 .

[3]  Amiya K. Jana,et al.  Heat integrated distillation operation , 2010 .

[4]  Paul Langston,et al.  Economic feasibility of heat pumps in distillation to reduce energy use , 2009 .

[5]  Antonio Flores-Tlacuahuac,et al.  Modeling, simulation and control of an internally heat integrated pressure-swing distillation process for bioethanol separation , 2011, Comput. Chem. Eng..

[6]  Amiya K. Jana,et al.  A novel intensified heat integration in multicomponent distillation , 2012 .

[7]  S. Macchietto,et al.  Efficient Optimization of Batch Distillation with Chemical Reaction Using Polynomial Curve Fitting Techniques , 1997 .

[8]  Anton A. Kiss,et al.  Energy efficient control of a BTX dividing-wall column , 2011, Comput. Chem. Eng..

[9]  Jose Alvarez-Ramirez,et al.  Output-feedback control of reactive batch distillation columns , 2000 .

[10]  Peter Mizsey,et al.  Rigorous investigation of heat pump assisted distillation , 1995 .

[11]  Carlos A. Infante Ferreira,et al.  Towards energy efficient distillation technologies – Making the right choice , 2012 .

[12]  Rakesh Agrawal,et al.  Energy Efficiency Limitations of the Conventional Heat Integrated Distillation Column (HIDiC) Configuration for Binary Distillation , 2011 .

[13]  Robin Smith,et al.  Reducing CO2 emissions and energy consumption of heat-integrated distillation systems. , 2005, Environmental science & technology.

[14]  M. Nakaiwa,et al.  Energy saving in multicomponent separation using an internally heat-integrated distillation column (HIDiC) , 2006 .

[15]  B. Suphanit,et al.  Design of internally heat-integrated distillation column (HIDiC): Uniform heat transfer area versus uniform heat distribution , 2010 .

[16]  Amiya K. Jana,et al.  Nonlinear state estimation and control of a batch reactive distillation , 2009 .

[17]  Amiya K. Jana,et al.  Heat pump assisted reactive distillation: Wide boiling mixture , 2011 .

[18]  Ljubica Matijašević,et al.  Dividing wall column—A breakthrough towards sustainable distilling , 2010 .

[19]  Amiya K. Jana,et al.  Reducing total annualized cost and CO2 emissions in batch distillation: Dynamics and control , 2013 .

[20]  Akira Endo,et al.  Operation of a bench-scale ideal heat integrated distillation column (HIDiC): an experimental study , 2000 .