Formation of NOx precursors during Chinese pulverized coal pyrolysis in an arc plasma jet
Journal Article
·
· Energy and Fuels
OSTI ID:20939420
- Taiyuan University of Technology, Taiyuan (China). Key Laboratory of Coal Science and Technology
The formation of NOx precursors (HCN and NH{sub 3}) from the pyrolysis of several Chinese pulverized coals in an arc plasma jet was investigated through both thermodynamic analysis of the C-H-O-N system and experiments. Results of thermodynamic analysis show that the dominant N-containing gaseous species is HCN together with a small amount of ammonia above the temperature of 2000 K. The increase of H content advances the formation of HCN and NH{sub 3}, but the yields of HCN and NH{sub 3} are decreased with a high concentration of O in the system. These results are accordant with the experimental data. The increasing of input power promotes the formation of HCN and NH{sub 3} from coal pyrolysis in an arc plasma jet. Tar-N is not formed during the process. The yield of HCN changes insignificantly with the changing of the residence time of coal particles in the reactor, but that of NH{sub 3} decreases as residence times increase because of the relative instability at high temperature. Adsorption and gasification of CO{sub 2} on the coal surface also can restrain the formation of HCN and NH{sub 3} compare to the results in an Ar plasma jet. Yields of HCN and NH{sub 3} are sensitive to the coal feeding rate, indicating that NOx precursors could interact with the nascent char to form other N-containing species. The formation of HCN and NH{sub 3} during coal pyrolysis in a H{sub 2}/Ar plasma jet are not dependent on coal rank. The N-containing gaseous species is released faster than others in the volatiles during coal pyrolysis in an arc plasma jet, and the final nitrogen content in the char is lower than that in the parent coal, which it is independent of coal type. 16 refs., 9 figs., 1 tab.
- OSTI ID:
- 20939420
- Journal Information:
- Energy and Fuels, Journal Name: Energy and Fuels Journal Issue: 4 Vol. 21; ISSN ENFUEM; ISSN 0887-0624
- Country of Publication:
- United States
- Language:
- English
Similar Records
Formation of NH{sub 3} during the pyrolysis of a brown coal
Effects of experimental conditions on the formation of NH{sub 3}, HCN and H{sub 2}S during the pyrolysis of a brown coal
Investigation on coal pyrolysis in CO{sub 2} atmosphere
Conference
·
Wed Dec 30 23:00:00 EST 1998
·
OSTI ID:349215
Effects of experimental conditions on the formation of NH{sub 3}, HCN and H{sub 2}S during the pyrolysis of a brown coal
Conference
·
Thu Jul 01 00:00:00 EDT 1999
·
OSTI ID:20082272
Investigation on coal pyrolysis in CO{sub 2} atmosphere
Journal Article
·
Wed Jul 15 00:00:00 EDT 2009
· Energy and Fuels
·
OSTI ID:21233742