Frontiers in Energy
>> 2009,
Volume 3,
Issue 2
doi:
10.1007/s11708-009-0006-0
RESEARCH ARTICLE
Effect of circulating ash from CFB boilers on NO and N
1. Utilities Engineering Department CISDI Engineering Co., Ltd., Chongqing 400013, China; 2. Department of Thermal Engineering, Tsinghua University, Beijing 100084, China
Available online: 2009-06-05
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Abstract
NO and N O emissions from circulating fluidized bed (CFB) boilers are determined by their formation and destruction rates in the furnace. The effect of circulating ash from a CFB boiler on NO and N O emissions were investigated in a laboratory-scale fluidized bed reactor. The results show that the residue char in circulating ash and the CO generated from the char play an important role in NO reduction and N O formation; however, active components of circulating ash such as CaO, Fe O accelerate the decomposition of N O. Experiment was also conducted on a 75 t/h CFB boiler fueled with the mixture of anthracite and biomass. The lower residue carbon content of circulating ash in this experiment is lower; therefore, the reacting rate of NO deoxidize is limited. This result verified the conclusion of laboratory research.
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