Effect of injection flow rate on product gas quality in underground coal gasification (UCG) based on laboratory scale experiment: Development of co-axial UCG system

Akihiro Hamanaka, Fa Qiang Su, Ken Ichi Itakura, Kazuhiro Takahashi, Jun Ichi Kodama, Gota Deguchi

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Underground coal gasification (UCG) is a technique to recover coal energy without mining by converting coal into a valuable gas. Model UCG experiments on a laboratory scale were carried out under a low flow rate (6∼12 L/min) and a high flow rate (15∼30 L/min) with a constant oxygen concentration. During the experiments, the coal temperature was higher and the fracturing events were more active under the high flow rate. Additionally, the gasification efficiency, which means the conversion efficiency of the gasified coal to the product gas, was 71.22% in the low flow rate and 82.42% in the high flow rate. These results suggest that the energy recovery rate with the UCG process can be improved by the increase of the reaction temperature and the promotion of the gasification area.

Original languageEnglish
Article number238
JournalEnergies
Volume10
Issue number2
DOIs
Publication statusPublished - 2017

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Control and Optimization
  • Electrical and Electronic Engineering

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