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 journalArticle

53 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

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Tars
Coal
Tar
Lignite
Reforming reactions
Coke
Pyrolysis
Gasification
Gases
Boiling point
Steam reforming
Coking
Steam
Naphthalene
Benzene
Deposits
Temperature
Catalysts

All Science Journal Classification (ASJC) codes

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

Cite this

In-situ reforming of tar from the rapid pyrolysis of a brown coal over char. / Matsuhara, Toru; Hosokai, Sou; Norinaga, Koyo; Matsuoka, Koichi; Li, Chun Zhu; Hayashi, Jun Ichiro.

In: Energy and Fuels, Vol. 24, No. 1, 21.01.2010, p. 76-83.

Research output: Contribution to journalArticle

Matsuhara, T, Hosokai, S, Norinaga, K, Matsuoka, K, Li, CZ & Hayashi, JI 2010, 'In-situ reforming of tar from the rapid pyrolysis of a brown coal over char', Energy and Fuels, vol. 24, no. 1, pp. 76-83. https://doi.org/10.1021/ef9005109
Matsuhara, Toru ; Hosokai, Sou ; Norinaga, Koyo ; Matsuoka, Koichi ; Li, Chun Zhu ; Hayashi, Jun Ichiro. / In-situ reforming of tar from the rapid pyrolysis of a brown coal over char. In: Energy and Fuels. 2010 ; Vol. 24, No. 1. pp. 76-83.
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