Air gasification of peat, wood and brown coal in a pressurized fluidized-bed reactor. II: Formation of nitrogen compounds

Esa Kurkela (Corresponding Author), Pekka Ståhlberg

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

The formation of nitrogen compounds in the air gasification of peat, wood and brown coal was studied in a small fluidized bed reactor, which was operated under pressure (0.4 MPa to 1.0 MPa) and at temperatures ranging from 800°C to 995°C. The fuel nitrogen of all fuels studied was converted mainly into ammonia. Smaller amounts of HCN and nitrogen-containing tar compounds were formed too. The ammonia concentration of the product gas was in the range of 0.56–1.13 vol% in peat gasification, representing 55–95 wt% of the peat nitrogen. Raising the freeboard temperature from 800 to 950°C resulted only in a small reduction in the conversion of peat nitrogen into ammonia. Similar conversions were also observed in brown coal and wood gasification, but since the nitrogen content of these fuels is lower, the ammonia concentrations were correspondingly lower and ranged between 0.05 and 0.09 vol% for wood and between 0.21 and 0.28 vol% for brown coal. The HCN concentration of the product gas in peat gasification increased with the rising temperature and ranged between 50 ppmv at 820°C and 200 ppmv at 920°C. In brown coal gasification the HCN concentration was in the range of 60–100 ppm at gasification temperatures of 850–910°C.

Original languageEnglish
Pages (from-to)23 - 32
Number of pages10
JournalFuel Processing Technology
Volume31
Issue number1
DOIs
Publication statusPublished - 1992
MoE publication typeA1 Journal article-refereed

Fingerprint

Nitrogen Compounds
Nitrogen compounds
Peat
Coal
Lignite
Gasification
Fluidized beds
Wood
Nitrogen
Ammonia
Air
Gases
Tars
Temperature
Coal gasification
Tar

Keywords

  • gasification
  • fluidized beds

Cite this

@article{2441a33bb83a4cd188eef76773c603a0,
title = "Air gasification of peat, wood and brown coal in a pressurized fluidized-bed reactor. II: Formation of nitrogen compounds",
abstract = "The formation of nitrogen compounds in the air gasification of peat, wood and brown coal was studied in a small fluidized bed reactor, which was operated under pressure (0.4 MPa to 1.0 MPa) and at temperatures ranging from 800°C to 995°C. The fuel nitrogen of all fuels studied was converted mainly into ammonia. Smaller amounts of HCN and nitrogen-containing tar compounds were formed too. The ammonia concentration of the product gas was in the range of 0.56–1.13 vol{\%} in peat gasification, representing 55–95 wt{\%} of the peat nitrogen. Raising the freeboard temperature from 800 to 950°C resulted only in a small reduction in the conversion of peat nitrogen into ammonia. Similar conversions were also observed in brown coal and wood gasification, but since the nitrogen content of these fuels is lower, the ammonia concentrations were correspondingly lower and ranged between 0.05 and 0.09 vol{\%} for wood and between 0.21 and 0.28 vol{\%} for brown coal. The HCN concentration of the product gas in peat gasification increased with the rising temperature and ranged between 50 ppmv at 820°C and 200 ppmv at 920°C. In brown coal gasification the HCN concentration was in the range of 60–100 ppm at gasification temperatures of 850–910°C.",
keywords = "gasification, fluidized beds",
author = "Esa Kurkela and Pekka St{\aa}hlberg",
note = "Project code: POV1001",
year = "1992",
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language = "English",
volume = "31",
pages = "23 -- 32",
journal = "Fuel Processing Technology",
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Air gasification of peat, wood and brown coal in a pressurized fluidized-bed reactor. II : Formation of nitrogen compounds. / Kurkela, Esa (Corresponding Author); Ståhlberg, Pekka.

In: Fuel Processing Technology, Vol. 31, No. 1, 1992, p. 23 - 32.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Air gasification of peat, wood and brown coal in a pressurized fluidized-bed reactor. II

T2 - Formation of nitrogen compounds

AU - Kurkela, Esa

AU - Ståhlberg, Pekka

N1 - Project code: POV1001

PY - 1992

Y1 - 1992

N2 - The formation of nitrogen compounds in the air gasification of peat, wood and brown coal was studied in a small fluidized bed reactor, which was operated under pressure (0.4 MPa to 1.0 MPa) and at temperatures ranging from 800°C to 995°C. The fuel nitrogen of all fuels studied was converted mainly into ammonia. Smaller amounts of HCN and nitrogen-containing tar compounds were formed too. The ammonia concentration of the product gas was in the range of 0.56–1.13 vol% in peat gasification, representing 55–95 wt% of the peat nitrogen. Raising the freeboard temperature from 800 to 950°C resulted only in a small reduction in the conversion of peat nitrogen into ammonia. Similar conversions were also observed in brown coal and wood gasification, but since the nitrogen content of these fuels is lower, the ammonia concentrations were correspondingly lower and ranged between 0.05 and 0.09 vol% for wood and between 0.21 and 0.28 vol% for brown coal. The HCN concentration of the product gas in peat gasification increased with the rising temperature and ranged between 50 ppmv at 820°C and 200 ppmv at 920°C. In brown coal gasification the HCN concentration was in the range of 60–100 ppm at gasification temperatures of 850–910°C.

AB - The formation of nitrogen compounds in the air gasification of peat, wood and brown coal was studied in a small fluidized bed reactor, which was operated under pressure (0.4 MPa to 1.0 MPa) and at temperatures ranging from 800°C to 995°C. The fuel nitrogen of all fuels studied was converted mainly into ammonia. Smaller amounts of HCN and nitrogen-containing tar compounds were formed too. The ammonia concentration of the product gas was in the range of 0.56–1.13 vol% in peat gasification, representing 55–95 wt% of the peat nitrogen. Raising the freeboard temperature from 800 to 950°C resulted only in a small reduction in the conversion of peat nitrogen into ammonia. Similar conversions were also observed in brown coal and wood gasification, but since the nitrogen content of these fuels is lower, the ammonia concentrations were correspondingly lower and ranged between 0.05 and 0.09 vol% for wood and between 0.21 and 0.28 vol% for brown coal. The HCN concentration of the product gas in peat gasification increased with the rising temperature and ranged between 50 ppmv at 820°C and 200 ppmv at 920°C. In brown coal gasification the HCN concentration was in the range of 60–100 ppm at gasification temperatures of 850–910°C.

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