流體化床燃燒爐中一氧化氮之生成機制

倪宏玟

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流體化床燃燒爐中一氧化氮之生成機制

The Mechanism of NO Emission in Fluidized Bed Combustor

倪宏玟 , Masters　　Advisor：錢建嵩　　

繁體中文

流體化床燃燒爐；燃料氮； FBC ； Volatile-N ； Char-N

Abstract │ Reference (68) │ Altmetrics

Abstract 〈TOP〉

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In this study, the effect of char nitrogen and volatile nitrogen on the formation and emission of nitric oxide in fuel nitrogen were investigated. Experiments in this study are carried out in the pilot-scale vortexing fluidized bed which is 0.8 m length × 0.4 m width × 4.7 m height. In the case of fixed total heat release(130,000 kcal/hr), co-combusted with two mode:(a) coke adsorbed model compounds and toluene,(b)coke and toluene mixed with model compounds . Total primary air is 3.5 Nm3/min and secondary air is 1.5 Nm3/min and change bed temperature (750,800,850,900℃) to explore the operation conditions for the formation and release of nitric oxide.

The results of the co-combustion show that the combustion chamber is the most important region for NO formation and decreases with increasing height, because of NO reduction with coke. Addition, the nitrogen component adsorbed on the coke reacts with the oxygen in the air to form nitric oxide, resulting in a slight increase in the NO concentration of the exit. The formation and emission concentration of NO increases with the bed temperature rise (750 to 850℃), and decreases when bed temperature over 850℃.
   The conversion of fuel nitrogen to NO is studied, and in the presence of nitro has highest conversion, and heterocyclic construction is relatively small. The results of the conversion of the fuel nitrogen of the mixture of the nitrogen-containing material on toluene co-combusted with coke were higher than those of the mixture of the nitrogen-containing material on the coke and co-combusted with toluene, implied volatile-N is the major factor of NO generation.

Reference ( 68 ) 〈TOP〉

Amand L. and B. Lechner, “Oxidation of Volatile Nitrogen Compounds during Combustion in Circulating Fluidized Bed Boilers,” Energy & Fuel, 5, 809-815(1991).
連結：
Arenilas A., F. R., Jose' J. Pis (2002). "Nitric Oxide Reduction in Coal Combustion: Role of Char Surface Complexes in Heterogeneous Reaction." Enviromental Science & Technology 36: 5498-5503.
連結：
Ashman P.J., B. S. Haynes, A. N. Buckley and P. F. Nelson, “The fate of char-nitrogen in low temperature oxidation,” Proc Combust Inst, 27, 3069-3075 (1998).
連結：
Ashman P.J., B. S. Haynes, P. M. Nicholls and P. F. Nelson, “Interactions of gaseous NO with char during the low temperature oxidation of coal chars,” Proc Combust Inst, 28, 2171-2179 (2000).
連結：
Bai J., C.Yu, L.Li, P. Wu, Z. Luo and M. Ni, “Experimental Study on the NO and N2O Formation Characteristics,” Energy &Fuel., 27, 515-522 (2012)
連結：

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