Data-driven robust optimization for minimum nitrogen oxide emission under process uncertainty

Minsu Kim, Sunghyun Cho, Kyojin Jang, Seokyoung Hong, Jonggeol Na, Il Moon

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The explosive waste materials used in military weapon systems are disposed by incineration through a fluidized bed reactor. In this process, pollutants such as nitrogen oxide (NOx) are inevitably generated. In particular, the reduction of NOx in the atmosphere is essential because it causes acid rain, global warming due to ozone destruction, and smog. Consequently, it is necessary to find the optimal operating conditions that can minimize the NOx emissions in the actual process in which large amounts of NOx are emitted. However, because various uncertainties exist in the actual process, deterministic optimization is difficult. Here, we introduce a robust optimization framework that finds the optimal operating conditions for parametric uncertainties through data-driven polynomial chaos expansion. By operating the incinerator under the optimal operating conditions obtained through this optimization framework, NOx emission was stably reduced despite uncertainties of explosive waste particle conditions; compared to the nominal optimum, the mean of NOx production rate decreased by 13.6–13.9% and the variance decreased by 36.1–36.3%.

Original languageEnglish
Article number130971
JournalChemical Engineering Journal
Volume428
DOIs
StatePublished - 15 Jan 2022

Keywords

  • Computational fluid dynamics
  • Incinerator
  • NOx
  • Polynomial chaos expansion
  • Robust optimization
  • Uncertainty quantification

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