Investigation of the evolved gases from Sulcis coal during pyrolysis under N

Silvera Scaccia, Antonio Calabrò, Roberta Mecozzi

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Abstract

The evolution of gases and volatiles during Sulcis coal pyrolysis under different atmospheres (N2and H2) was investigated to obtaining a clean feedstock of combustion/gasification for electric power generation. Raw coal samples were slowly heated in temperature programmed mode up to 800°C at ambient pressure using a laboratory-scale quartz furnace coupled to a Fourier transform infrared spectrometer (FTIR) for evolved gas analysis. Under both pyrolysis and hydropyrolysis conditions the evolution of gases started at temperature as low as 100°C and was mainly composed by CO and CO2as gaseous products. With increasing temperature SO2, COS, and light aliphatic gases (CH4and C2H4) were also released. The release of SO2took place up to 300°C regardless of the pyrolysis atmosphere, whilst the COS emissions were affected by the surrounding environment. Carbon oxide, CO2, and CH4continuously evolved up to 800°C, showing similar release pathways in both N2and H2atmospheres. Trace of HCNO was detected at low pyrolysis temperature solely in pure H2stream. Finally, the solid residues of pyrolysis (chars) were subjected to reaction with H2to produce CH4at 800°C under 5.0 MPa pressure. The chars reactivity was found to be dependent on pyrolysis atmosphere, being the carbon conversions of 36% and 16% for charN2and charH2, respectively. © 2012 Elsevier B.V.
Original languageEnglish
Pages (from-to)45 - 50
Number of pages6
JournalJournal of Analytical and Applied Pyrolysis
Volume98
DOIs
Publication statusPublished - Nov 2012

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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