Formation and reduction of CO and NOx in a rice husk-fuelled fluidized-bed combustor using air staging

K. Janvijitsakul, . and V. I. Kuprianov, . and P. Arromdee, . (2008) Formation and reduction of CO and NOx in a rice husk-fuelled fluidized-bed combustor using air staging. [Proceedings Paper]

In this experimental work effects of air staging on the combustion and environmental performance of a fluidized-bed combustor with a cone-shaped bed referred to as ;conical FBC; were investigated for firing 80 kglh rice husk at different values of excess air EA of about 20 60 and 80. For the particular total excess air the test runs were conducted at three secondary-to-total air ratios SIT of 0 0.2 and 0.4. During the conventional combustion SIT 0 the axial temperature profiles in the conical FBC were weakly dependent on EA but exhibited an apparent influence of the air staging. In the meantime with implementation of air-staged combustion the axial O2 concentration profiles were strongly affected by both EA and SIT while the axial CO and NOx concentration profiles showed a moderate influence of the operating conditions. At relatively low EA values the CO emission from the conical FBC reduced significantly with increasing EA and these effects weakened at high EA values. However an increase in SIT resulted in higher CO emissions at fixed EA values. Following the fuel-NO fonnation mechanism NOx emissions from the combustor increased with increasing EA. The NO emissions could be controlled reduced through implementation of air staging in this reactor.

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Abstract

In this experimental work effects of air staging on the combustion and environmental performance of a fluidized-bed combustor with a cone-shaped bed referred to as ;conical FBC; were investigated for firing 80 kglh rice husk at different values of excess air EA of about 20 60 and 80. For the particular total excess air the test runs were conducted at three secondary-to-total air ratios SIT of 0 0.2 and 0.4. During the conventional combustion SIT 0 the axial temperature profiles in the conical FBC were weakly dependent on EA but exhibited an apparent influence of the air staging. In the meantime with implementation of air-staged combustion the axial O2 concentration profiles were strongly affected by both EA and SIT while the axial CO and NOx concentration profiles showed a moderate influence of the operating conditions. At relatively low EA values the CO emission from the conical FBC reduced significantly with increasing EA and these effects weakened at high EA values. However an increase in SIT resulted in higher CO emissions at fixed EA values. Following the fuel-NO fonnation mechanism NOx emissions from the combustor increased with increasing EA. The NO emissions could be controlled reduced through implementation of air staging in this reactor.

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Item Type:	Proceedings Paper
Additional Information:	Available at Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia. GE90 M3I61 2008 Call Number
AGROVOC Term:	Combustion
AGROVOC Term:	Copper
AGROVOC Term:	Rice husks
AGROVOC Term:	Fluidized bed combustors
Geographical Term:	MALAYSIA
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 05:14
URI:	http://webagris.upm.edu.my/id/eprint/11794

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