Formation of NH3 and HCN in slow-heating-rate inert pyrolysis of peat, coal and bark

Jukka Leppälahti

Research output: Contribution to journalArticleScientificpeer-review

96 Citations (Scopus)

Abstract

In gasification processes, nitrogen compounds are formed in the gas. There are very few data available on the conversion of fuel nitrogen to nitrogen compounds in pyrolysis conditions that simulate fixed-bed or fluidized-bed gasification or other fuels than coal.
In this study, relatively large fuel pieces of peats, bark and coal were pyrolysed in an inert gas atmosphere at a slow heating rate. All fuels produced more NH3 than HCN. The conversion of fuel nitrogen to NH3 ranged from 17 to 24 wt% for peat, 10 to 12 wt% for bark and 15 to 17 wt% for coal.
The conversion of fuel nitrogen to HCN was 5–11 wt% for coals and considerably less for the other fuels. Increasing the tar cracking can increase the HCN conversion and NH3 conversion in peat pyrolysis.
The pyrolysis of fuel pieces seems to produce the NH3 and HCN observed in the fixed-bed gasifiers.
Original languageEnglish
Pages (from-to)1363-1368
JournalFuel
Volume74
Issue number9
DOIs
Publication statusPublished - 1995
MoE publication typeA1 Journal article-refereed

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Peat
Coal
Heating rate
Pyrolysis
Nitrogen Compounds
Nitrogen compounds
Nitrogen
Gasification
Noble Gases
Tars
Tar
Inert gases
Fluidized beds
Gases

Cite this

Leppälahti, Jukka. / Formation of NH3 and HCN in slow-heating-rate inert pyrolysis of peat, coal and bark. In: Fuel. 1995 ; Vol. 74, No. 9. pp. 1363-1368.
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title = "Formation of NH3 and HCN in slow-heating-rate inert pyrolysis of peat, coal and bark",
abstract = "In gasification processes, nitrogen compounds are formed in the gas. There are very few data available on the conversion of fuel nitrogen to nitrogen compounds in pyrolysis conditions that simulate fixed-bed or fluidized-bed gasification or other fuels than coal. In this study, relatively large fuel pieces of peats, bark and coal were pyrolysed in an inert gas atmosphere at a slow heating rate. All fuels produced more NH3 than HCN. The conversion of fuel nitrogen to NH3 ranged from 17 to 24 wt{\%} for peat, 10 to 12 wt{\%} for bark and 15 to 17 wt{\%} for coal. The conversion of fuel nitrogen to HCN was 5–11 wt{\%} for coals and considerably less for the other fuels. Increasing the tar cracking can increase the HCN conversion and NH3 conversion in peat pyrolysis. The pyrolysis of fuel pieces seems to produce the NH3 and HCN observed in the fixed-bed gasifiers.",
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Formation of NH3 and HCN in slow-heating-rate inert pyrolysis of peat, coal and bark. / Leppälahti, Jukka.

In: Fuel, Vol. 74, No. 9, 1995, p. 1363-1368.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Formation of NH3 and HCN in slow-heating-rate inert pyrolysis of peat, coal and bark

AU - Leppälahti, Jukka

PY - 1995

Y1 - 1995

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AB - In gasification processes, nitrogen compounds are formed in the gas. There are very few data available on the conversion of fuel nitrogen to nitrogen compounds in pyrolysis conditions that simulate fixed-bed or fluidized-bed gasification or other fuels than coal. In this study, relatively large fuel pieces of peats, bark and coal were pyrolysed in an inert gas atmosphere at a slow heating rate. All fuels produced more NH3 than HCN. The conversion of fuel nitrogen to NH3 ranged from 17 to 24 wt% for peat, 10 to 12 wt% for bark and 15 to 17 wt% for coal. The conversion of fuel nitrogen to HCN was 5–11 wt% for coals and considerably less for the other fuels. Increasing the tar cracking can increase the HCN conversion and NH3 conversion in peat pyrolysis. The pyrolysis of fuel pieces seems to produce the NH3 and HCN observed in the fixed-bed gasifiers.

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DO - 10.1016/0016-2361(95)00091-I

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