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

Jukka Leppälahti, Esa Kurkela

Research output: Contribution to journalArticleScientificpeer-review

51 Citations (Scopus)

Abstract

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
JournalFuel
Volume70
Issue number4
DOIs
Publication statusPublished - 1991
MoE publication typeA1 Journal article-refereed

Fingerprint

Nitrogen Compounds
Tars
Nitrogen compounds
Peat
Tar
Gasification
Fluidized beds
Air
Gases
Benzene
Atmospheric pressure
Nitrogen
Temperature
dolomite

Keywords

  • gasification
  • fluidized beds

Cite this

@article{217bf1c947134262a818a7d8bfe0f0c1,
title = "Behaviour of nitrogen compounds and tars in fluidized bed air gasification of peat",
abstract = "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.",
keywords = "gasification, fluidized beds",
author = "Jukka Lepp{\"a}lahti and Esa Kurkela",
note = "Project code: POV8016",
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doi = "10.1016/0016-2361(91)90026-7",
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pages = "491 -- 497",
journal = "Fuel",
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}

Behaviour of nitrogen compounds and tars in fluidized bed air gasification of peat. / Leppälahti, Jukka; Kurkela, Esa.

In: Fuel, Vol. 70, No. 4, 1991, p. 491 - 497.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Behaviour of nitrogen compounds and tars in fluidized bed air gasification of peat

AU - Leppälahti, Jukka

AU - Kurkela, Esa

N1 - Project code: POV8016

PY - 1991

Y1 - 1991

N2 - 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.

AB - 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.

KW - gasification

KW - fluidized beds

U2 - 10.1016/0016-2361(91)90026-7

DO - 10.1016/0016-2361(91)90026-7

M3 - Article

VL - 70

SP - 491

EP - 497

JO - Fuel

JF - Fuel

SN - 0016-2361

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ER -