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International Journal of Energy for a Clean Environment
SJR: 0.195 SNIP: 0.435 CiteScore™: 0.74

ISSN 印刷: 2150-3621
ISSN オンライン: 2150-363X

International Journal of Energy for a Clean Environment

Formerly Known as Clean Air: International Journal on Energy for a Clean Environment

DOI: 10.1615/InterJEnerCleanEnv.v5.i2.50
16 pages

A STUDY ON COAL BLENDING FOR REDUCING NOx AND N2O LEVELS DURING FLUIDIZED BED COMBUSTION

D. Boavida
DEECA-INETI, Edificio J, Estrada do Paco do Lumiar 22, 1649-038 Lisboa, Portugal
P. Abelha
DEECA-INETI, Edificio J, Estrada do Paco do Lumiar 22, 1649-038 Lisboa, Portugal
I. Gulyurtlu
DEECA-INETI, Edificio J, Estrada do Paco do Lumiar 22, 1649-038 Lisboa, Portugal
Bruno Valentim
Centro de Geologia e Departamento de Geociências, Ambiente e Ordenamento do Território da Faculdade de Ciencias, Universidade do Porto, Portugal
M. J. Lemos De Sousa
Universidade Fernando Pessoa - CIAGEB, Praça de 9 de Abril 349, 4249-004 Porto; Academia das Ciências de Lisboa, Rua da Academia das Ciências 19, 1249-122 Lisboa, Portugal

要約

The objective of the study was to investigate the effect of blending on the emissions of NOx and N2O during the fluidized bed combustion of five coals with different levels of nitrogen, volatile matter, and fixed carbon contents, and diverse coal and char petrographic composition.
The devolatilization chars were produced in a fluidized bed combustor. Using the petrographic analyses of the coals, sixteen coal blends were made to carry out the combustion tests.
The combustion of individual coals and the sixteen blends was carried out in an electrically heated atmospheric fluidized bed combustor.
The emissions of NOx reached maximum values at a bed temperature around 1173 K and decreased with lower combustion temperatures. The amount of nitrous oxide formed decreased, for all five coals, as the bed temperature increased from 1053 to 1303 K. These trends are consistent with the observed experimental data obtained by other researchers. It was observed that for ratios of 1.3 to 1.6 of fixed carbon to volatile matter, both NOx and N2O emission levels were minimal and, outside this range, both oxides showed a sharp increase in their formation/emissions. The coal blends were also found to show similar trends with increasing the bed temperatures.
The results serve to establish the relative importance of volatile and fixed carbon reactivity and coal and char petrography, which is believed to significantly contribute to devolatilization mechanisms and char reactivity.


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