Ex Situ UCG model experiments with oxygen enriched air in an artificial coal seam

Fa Qiang Su, Kenichi Itakura, Akihiro Hamanaka, Gota Deguchi, Kohki Sato, Jun Ichi Kodama

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Underground Coal Gasification (UCG) demands precise evaluation of the combustion area in the coal seam. Especially, the monitoring of fracture activity in the coal seam and around rock is important not only for efficient gas production but also for estimation of subsidence and gas leakage to the surface. For this objective, laboratory experiments were conducted using the simulated UCG models. This paper also investigated gas energy for coal consumption, the production gas quantity and heat value, the application of oxygen element balance in the gasification reaction process, and the gas composition obtained in this study. During burning of the coal, temperatures inside the coal, contents of product gases and acoustic emission (AE) activities were monitored successively under the control of feeding gas (air/oxygen and steam) flow rate. Comparison of the temperature variation and accumulated AE event curves revealed a close correlation between them. The local change of temperature inside the coal induced fractures with AE. The AE activity was related closely to the local changes of temperature inside the model. The evaluation of gas energy recovery calculated from the obtained product gas provided a fair evaluation for the coal consumed, and the quantity of gas product and calorific value obtained from the UCG process.

Original languageEnglish
Title of host publicationEngineering Materials and Technology - ICMSET 2016
EditorsJong Won Jung
PublisherTrans Tech Publications Ltd
Pages379-384
Number of pages6
ISBN (Print)9783035710335
DOIs
Publication statusPublished - Jan 1 2017
EventInternational Conference on Material Science and Engineering Technology, ICMSET 2016 - Phuket, Thailand
Duration: Oct 14 2016Oct 16 2016

Publication series

NameKey Engineering Materials
Volume737 KEM
ISSN (Print)1013-9826
ISSN (Electronic)1662-9795

Other

OtherInternational Conference on Material Science and Engineering Technology, ICMSET 2016
CountryThailand
CityPhuket
Period10/14/1610/16/16

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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  • Cite this

    Su, F. Q., Itakura, K., Hamanaka, A., Deguchi, G., Sato, K., & Kodama, J. I. (2017). Ex Situ UCG model experiments with oxygen enriched air in an artificial coal seam. In J. W. Jung (Ed.), Engineering Materials and Technology - ICMSET 2016 (pp. 379-384). (Key Engineering Materials; Vol. 737 KEM). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/KEM.737.379