Self-sustaining smouldering combustion of coal tar for the remediation of contaminated sand: Two-dimensional experiments and computational simulations

Tanzeer Hasan, Jason I. Gerhard*, Rory Hadden, Guillermo Rein

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

This study presents the development and validation of a computational model which simulates the propagation of a smouldering front through a porous medium against unique experiments in coal tar and sand. The model couples a multiphase flow solver in porous media with a perimeter expansion module based on Huygens principle to predict the spread. A suite of two-dimensional experiments using coal tar-contaminated sand were conducted to explore the time-dependent vertical and lateral smouldering front propagation rates and final extent of remediation as a function of air injection rate. A thermal severity analysis revealed, for the first time, the temperature-time relationship indicative of coal tar combustion. The model, calibrated to the base case experiment, then correctly predicts the remaining experiments. This work provides further confidence in a model for predicting smouldering, which eventually is expected to be useful for designing soil remediation schemes for a novel technology based upon smouldering destruction of organic contaminants in soil. (C) 2015 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)288-297
Number of pages10
JournalFuel
Volume150
DOIs
Publication statusPublished - 15 Jun 2015

Keywords

  • Smouldering
  • Remediation
  • Multiple dimensions
  • Modelling
  • Thermal severity
  • POROUS-MEDIA
  • POLYURETHANE FOAM
  • PROPAGATION
  • MODEL
  • FRONTS
  • SCALE
  • FLOW

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