Conversion of Fuel-N to N2O and NOx during Coal Combustion in Combustors of Different Scale

doi:10.1016/S1004-9541(13)60571-6

Abstract

Abstract: With focus on investigating the effect of combustor scale on the conversion of fuel-N to NO_x and N₂O, experiments are carried out in three combustors, including single coal particle combustion test rig, laboratory scale circulating fluidized-bed boiler (CFB) and full scale CFB in this work. For single coal particle combustion, the majority of fuel-N (65%-82%) is released as NO_x, while only a little (less than 8%) fuel-N yields N₂O. But in laboratory scale CFB, the conversion of fuel-N to N₂O is increases, but the conversion of fuel-N to NO_x is quite less than that of single coal particle combustion. This is because much char in CFB can promote the NO_x reduction by increasing N₂O formation. In full scale CFB, both of the conversion of fuel-N to NO_x and the conversion of fuel-N to N₂O are smaller than laboratory scale CFB.

Key words: fuel-N, N₂O, NO_x, coal, fluidized bed

摘要： With focus on investigating the effect of combustor scale on the conversion of fuel-N to NO_x and N₂O, experiments are carried out in three combustors, including single coal particle combustion test rig, laboratory scale circulating fluidized-bed boiler (CFB) and full scale CFB in this work. For single coal particle combustion, the majority of fuel-N (65%-82%) is released as NO_x, while only a little (less than 8%) fuel-N yields N₂O. But in laboratory scale CFB, the conversion of fuel-N to N₂O is increases, but the conversion of fuel-N to NO_x is quite less than that of single coal particle combustion. This is because much char in CFB can promote the NO_x reduction by increasing N₂O formation. In full scale CFB, both of the conversion of fuel-N to NO_x and the conversion of fuel-N to N₂O are smaller than laboratory scale CFB.

关键词: fuel-N, N₂O, NO_x, coal, fluidized bed

ZHOU Hao, HUANG Yan, MO Guiyuan, LIAO Ziyu, CEN Kefa. Conversion of Fuel-N to N₂O and NO_x during Coal Combustion in Combustors of Different Scale[J]. Chin.J.Chem.Eng., 2013, 21(9): 999-1006.

周昊, 黄燕, 莫桂源, 廖子昱, 岑可法. Conversion of Fuel-N to N₂O and NO_x during Coal Combustion in Combustors of Different Scale[J]. Chinese Journal of Chemical Engineering, 2013, 21(9): 999-1006.

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Conversion of Fuel-N to N₂O and NO_x during Coal Combustion in Combustors of Different Scale

Conversion of Fuel-N to N₂O and NO_x during Coal Combustion in Combustors of Different Scale

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