Behaviour of nitrogen compounds and tars in fluidized bed air gasification of peat

Jukka Leppälahti, Esa Kurkela

Research output: Contribution to journalArticleScientificpeer-review

53 Citations (Scopus)


Formation of nitrogen compounds and tars, and the effect of process parameters on these were studied in a laboratory scale fluidized bed air gasifier under atmospheric pressure, using peat as fuel. Benzene was the main component of the tars, representing 50–75 wt% of the total tar. Addition of both secondary air and dolomite reduced the tar content of the gas. NH3 concentration ranged from 3170 to 4600 ppm and HCN concentration from 520 to 930 ppm in the measurements. With no secondary air, 30% of fuel nitrogen formed NH3 and 10% formed HCN. A rise in the freeboard temperature, caused by the addition of secondary air, had no significant effect on the concentration of nitrogen compounds. On the other hand, the presence of dolomite increased the NH3 concentration and reduced the HCN concentration of the gas.

Original languageEnglish
Pages (from-to)491 - 497
Number of pages7
Issue number4
Publication statusPublished - 1991
MoE publication typeA1 Journal article-refereed


  • gasification
  • fluidized beds

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