In-situ reforming of tar from the rapid pyrolysis of a brown coal over char

Toru Matsuhara, Sou Hosokai, Koyo Norinaga, Koichi Matsuoka, Chun Zhu Li, Jun Ichiro Hayashi

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)

Abstract

Reforming of nascent tar from the rapid pyrolysis of a brown coal over char prepared from the same coal was studied at 750-900 °C. The reforming was very rapid and extensive, allowing only benzene (0.02% on a coal C basis), naphthalene (0.001%), and phenanthrene (0.0001%) to escape from the char bed at an empty-bed gas residence time of less than 170 ms and 900 °C, respectively. Reforming even at 750 °C converted 96% of heavy tar (boiling point temperature >336 °C) into noncondensable gases and coke deposit over the char. Decreasing conversion of the tar into coke with increasing temperature suggested that the tar was reformed in a sequence of coking and steam gasification of the coke rather than direct steam reforming over the char. The reforming at 900 °C gave a negative coke yield due to progress of coke/ char gasification faster than the coke deposition. Results of this work thus showed a possibility of complete tar reforming by intensification of contact between the char and volatiles even in the absence of a catalyst.

Original languageEnglish
Pages (from-to)76-83
Number of pages8
JournalEnergy and Fuels
Volume24
Issue number1
DOIs
Publication statusPublished - Jan 21 2010

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology

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