Bisgaard, Thomas1; Huusom, Jakob Kjøbsted1; Abildskov, Jens1
1 Department of Chemical and Biochemical Engineering, Technical University of Denmark2 Computer Aided Process Engineering Center, Department of Chemical and Biochemical Engineering, Technical University of Denmark
Diabatic operation of distillation columns can lead to signicant reductions in energy utilization and operation cost compared to conventional (adiabatic) distillation columns, at an expense of an increased complexity of design and operation. The earliest diabatic distillation conguration dates back to the late 70s, and various dierent congurations have appeared since. However, at present, no full-scale diabatic distillation columns are currently operating in the industry. Current studies related to alternative distillation congurations report very dierent gures for potential energy savings which constitutes a problem in relations to achieving industrial acceptance. There is clearly a need for research and comparative studies which can help to provide analysis of the pros and cons of novel and intensied distillation processes compared to conventional columns for a range of separations. These studies must provide insight to both the static design properties such as the energy eciency, utility consumption and operational cost as well as the column operability and dynamic responses to typical disturbances. Where most eorts have been directed to ideal, binary systems of close boiling mixtures of hydrocarbons such as separations of equimolar mixtures of benzene/toluene or propane/propene described by simple models, a generic, modular, model framework is presented in this work. At present, the framework is able to describe a conventional distillation column, a mechanical vapor recompression column and a heat-integrated distillation column, but due to a modular structure the database can be further extended by additional congurations. The framework provides the basis for fair comparison of both steady state and dynamic performance of the dierent column congurations for a given binary or multicomponent separation. Furthermore it constitutes a signicant improvement in the fundamental modeling of e.g. the heat-integrated distillation column models often reported in literature and hence form a solid basis for quantitative performance evaluations.
Proceedings of the 18th Nordic Process Control Workshop (npcw18), 2013