Multi-objective optimization of microchannel reactor for Fischer-Tropsch synthesis using computational fluid dynamics and genetic algorithm

Jonggeol Na, Krishnadash S. Kshetrimayum, Ung Lee, Chonghun Han

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

We propose a multi-objective optimization methodology using a stochastic optimization algorithm, a genetic algorithm (GA) with ε-constraint method, and a 2D axisymmetric computational fluid dynamics (CFD)-based Fischer-Tropsch microchannel reactor model, validated by experimental data of CO conversion and CH4selectivity, for simultaneously maximizing C5+productivity and minimizing the temperature rise of a Fischer-Tropsch microchannel reactor. The main mixed integer nonlinear programming (MINLP) optimization problem is decomposed into an external CFD reactor model function and internal optimization constraints. The methodology is applied to the catalyst packing zone division, which is divided and packed with a different dilution ratio to distribute the heat of reaction evenly. The best solutions of the proposed optimizer are reproducible with different crossover fractions and are more efficient than other traditional non-convex constraint local solvers. Based on the Pareto optimal solution of the final optimizer with 4 zones, discrete dilution increases C5+productivity to 22% and decreases ΔTmaxto 63.2% compared to the single zone catalyst packing case. Finally, several Pareto optimal solutions and sub-optimal solutions are compared and the results are documented in terms of C5+productivity and maximum temperature increase.

Original languageEnglish
Pages (from-to)1521-1534
Number of pages14
JournalChemical Engineering Journal
Volume313
DOIs
StatePublished - 2017

Keywords

  • Catalyst packing
  • Computational fluid dynamics
  • Fischer-Tropsch
  • Microchannel reactor
  • Multi-objective optimization
  • Stochastic optimization

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