Effects of pressure, gas temperature and CO2 and O2 partial pressures on the conversion of coal-nitrogen to NO, N2O and NO2

Martti Aho, Pentti Pirkonen

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)

Abstract

The effects of pressure (2–16 bar), gas temperature (800–1100°C) and the partial pressures of carbon dioxide (0.01–4 bar) and oxygen (0.2–2 bar) on the formation of N2O, NO and NO2 from coal-N were studied. Bituminous coal, 75–125 μm, was burned as a dilute pressurized suspension in an electrically heated pressurized entrained-flow reactor.
Nitrogen oxides were analysed by an on-line FT-i.r. The experimental conditions differed from those of an earlier study in that high concentrations of CO2 (up to 80 vol.%) and higher oxygen partial pressures and especially concentrations (up to 50 vol.%) were used. The results were analysed by a partial-least-squares method. Increase of pressure decreased the conversion of fuel-nitrogen to NO, and had a weak effect on its conversion to N2O.
Increase of PCO2 increased slightly the conversion of fuel-N to N2O. The effect of PCO2 on NO formation was too weak to be clearly detected, although a weak decrease in conversion may occur when PCO2 is increased from 1 bar to 4 bar.
The conversion of fuel-N to NO2 was weak, but increased clearly when PCO2 was increased from 1.5 bar to 2.0 bar.
Original languageEnglish
Pages (from-to)1677-1681
JournalFuel
Volume74
Issue number11
DOIs
Publication statusPublished - 1995
MoE publication typeA1 Journal article-refereed

Fingerprint

Coal
Partial pressure
Nitrogen
Gases
Temperature
Nitrogen Oxides
Oxygen
Bituminous coal
Nitrogen oxides
Carbon Dioxide
Suspensions
Carbon dioxide

Keywords

  • coal
  • nitrogen compounds
  • conversion
  • nitrogen oxides
  • nitric oxide
  • nitrous oxide
  • nitrogen dioxide
  • pressure
  • temperature
  • carbon dioxide
  • oxygen

Cite this

@article{413f98c427204ce99e6573dbdebbe0d5,
title = "Effects of pressure, gas temperature and CO2 and O2 partial pressures on the conversion of coal-nitrogen to NO, N2O and NO2",
abstract = "The effects of pressure (2–16 bar), gas temperature (800–1100°C) and the partial pressures of carbon dioxide (0.01–4 bar) and oxygen (0.2–2 bar) on the formation of N2O, NO and NO2 from coal-N were studied. Bituminous coal, 75–125 μm, was burned as a dilute pressurized suspension in an electrically heated pressurized entrained-flow reactor. Nitrogen oxides were analysed by an on-line FT-i.r. The experimental conditions differed from those of an earlier study in that high concentrations of CO2 (up to 80 vol.{\%}) and higher oxygen partial pressures and especially concentrations (up to 50 vol.{\%}) were used. The results were analysed by a partial-least-squares method. Increase of pressure decreased the conversion of fuel-nitrogen to NO, and had a weak effect on its conversion to N2O. Increase of PCO2 increased slightly the conversion of fuel-N to N2O. The effect of PCO2 on NO formation was too weak to be clearly detected, although a weak decrease in conversion may occur when PCO2 is increased from 1 bar to 4 bar. The conversion of fuel-N to NO2 was weak, but increased clearly when PCO2 was increased from 1.5 bar to 2.0 bar.",
keywords = "coal, nitrogen compounds, conversion, nitrogen oxides, nitric oxide, nitrous oxide, nitrogen dioxide, pressure, temperature, carbon dioxide, oxygen",
author = "Martti Aho and Pentti Pirkonen",
year = "1995",
doi = "10.1016/0016-2361(95)00169-6",
language = "English",
volume = "74",
pages = "1677--1681",
journal = "Fuel",
issn = "0016-2361",
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number = "11",

}

Effects of pressure, gas temperature and CO2 and O2 partial pressures on the conversion of coal-nitrogen to NO, N2O and NO2. / Aho, Martti; Pirkonen, Pentti.

In: Fuel, Vol. 74, No. 11, 1995, p. 1677-1681.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Effects of pressure, gas temperature and CO2 and O2 partial pressures on the conversion of coal-nitrogen to NO, N2O and NO2

AU - Aho, Martti

AU - Pirkonen, Pentti

PY - 1995

Y1 - 1995

N2 - The effects of pressure (2–16 bar), gas temperature (800–1100°C) and the partial pressures of carbon dioxide (0.01–4 bar) and oxygen (0.2–2 bar) on the formation of N2O, NO and NO2 from coal-N were studied. Bituminous coal, 75–125 μm, was burned as a dilute pressurized suspension in an electrically heated pressurized entrained-flow reactor. Nitrogen oxides were analysed by an on-line FT-i.r. The experimental conditions differed from those of an earlier study in that high concentrations of CO2 (up to 80 vol.%) and higher oxygen partial pressures and especially concentrations (up to 50 vol.%) were used. The results were analysed by a partial-least-squares method. Increase of pressure decreased the conversion of fuel-nitrogen to NO, and had a weak effect on its conversion to N2O. Increase of PCO2 increased slightly the conversion of fuel-N to N2O. The effect of PCO2 on NO formation was too weak to be clearly detected, although a weak decrease in conversion may occur when PCO2 is increased from 1 bar to 4 bar. The conversion of fuel-N to NO2 was weak, but increased clearly when PCO2 was increased from 1.5 bar to 2.0 bar.

AB - The effects of pressure (2–16 bar), gas temperature (800–1100°C) and the partial pressures of carbon dioxide (0.01–4 bar) and oxygen (0.2–2 bar) on the formation of N2O, NO and NO2 from coal-N were studied. Bituminous coal, 75–125 μm, was burned as a dilute pressurized suspension in an electrically heated pressurized entrained-flow reactor. Nitrogen oxides were analysed by an on-line FT-i.r. The experimental conditions differed from those of an earlier study in that high concentrations of CO2 (up to 80 vol.%) and higher oxygen partial pressures and especially concentrations (up to 50 vol.%) were used. The results were analysed by a partial-least-squares method. Increase of pressure decreased the conversion of fuel-nitrogen to NO, and had a weak effect on its conversion to N2O. Increase of PCO2 increased slightly the conversion of fuel-N to N2O. The effect of PCO2 on NO formation was too weak to be clearly detected, although a weak decrease in conversion may occur when PCO2 is increased from 1 bar to 4 bar. The conversion of fuel-N to NO2 was weak, but increased clearly when PCO2 was increased from 1.5 bar to 2.0 bar.

KW - coal

KW - nitrogen compounds

KW - conversion

KW - nitrogen oxides

KW - nitric oxide

KW - nitrous oxide

KW - nitrogen dioxide

KW - pressure

KW - temperature

KW - carbon dioxide

KW - oxygen

U2 - 10.1016/0016-2361(95)00169-6

DO - 10.1016/0016-2361(95)00169-6

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SN - 0016-2361

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