Monitoring and evaluation of simulated underground coal gasification in an ex-situ experimental artificial coal seam system

Fa qiang Su, Akihiro Hamanaka, Ken ichi Itakura, Wenyan Zhang, Gota Deguchi, Kohki Sato, Kazuhiro Takahashi, Jun ichi Kodama

研究成果: Contribution to journalArticle査読

13 被引用数 (Scopus)

抄録

In this study, to better simulate underground coal gasification (UCG), an artificial coal seam was constructed to use as a simulated underground gasifier, which comprised coal blocks excavated from the coal seam. This study reports the process and results of three independently designed experiments using coaxial-hole and linking-hole UCG models: (a) a coaxial model using a coaxial pipeline as a gasification channel, (b) a coaxial model using the coaxial pipeline combined with a bottom cross-hole, and (c) a linking-hole model using a horizontal V-shaped cross-hole. In the present work, the fracturing activities and cavity growth inside the reactor were monitored with acoustic emission (AE) technologies. During the process, the temperature profiles, gas production rate, and gas content were measured successively. The results show that AE activities monitored during UCG process are significantly affected by operational variables such as feed gas rate, feed gas content, and linking-hole types. Moreover, the amount of coal consumed during UCG process were estimated using both of the stoichiometric approach and balance computation of carbon (C) based on the product gas contents. A maximum error of less than 10% was observed in these methods, in which the gas leakage was also considered. This demonstrates that the estimated results using the proposed stoichiometric approach could be useful for evaluating energy recovery during UCG.

本文言語英語
ページ(範囲)82-92
ページ数11
ジャーナルApplied Energy
223
DOI
出版ステータス出版済み - 8 1 2018

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Energy(all)
  • Mechanical Engineering
  • Management, Monitoring, Policy and Law

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