Weitere Kapitel dieses Buchs durch Wischen aufrufen
This paper studied the influence of CaO on NH3+NO+O2 reaction system in pre-calciner. Experiments were carried out in a fixed bed reactor. Influence of CaO on NH3+NO+O2 reaction, NH3 oxidation, NH3 decomposition and NO reduction by NH3 at O2 free condition were studied. NH3 conversion rates and product selectivities were obtained for each reaction condition. It was proved that the influence of CaO on SNCR performance changed with temperature. CaO promoted SNCR performance at 650°C and changed to inhibit SNCR performance when temperature increased above 700°C. CaO influenced the reaction of NH3+NO+O2 mainly by catalyzing NH3 oxidation. NH3 conversion rate and NO selectivity decreased when NH3 concentration increased. Addition of NO into NH3 heterogeneous oxidation had little effect on NH3 conversion rate but decreased NO selectivity. A reaction mechanism for NH3NO+O2 reaction on CaO surface was proposed. Heterogeneous reaction model of NH3+NO+O2 on CaO surface was established based on the proposed reaction mechanism. Numerical results showed that the reaction model in this paper could predict NH3 oxidation and NH3+NO+O2 reaction on CaO surface very well.
Bitte loggen Sie sich ein, um Zugang zu diesem Inhalt zu erhalten
Sie möchten Zugang zu diesem Inhalt erhalten? Dann informieren Sie sich jetzt über unsere Produkte:
Hu Z. The study on mechanism of nitrogen oxides transformation and control technology for precalciner. Wuhan: Huazhong University of Science and Technology; 2004 (in Chinese).
U.S. Environmental Protection Agency. Alternative control techniques document update – NO x emissions from new cement kilns. EPA-453/R-07-006. Durham: U.S. Environmental Protection Agency; 2007.
Lee YY, Sekthira A, Wong CM. The effect of calcined limestones on the NH 3 + NO + O 2 reaction. In: Proceedings of the 8th international conference on fluidized-bed combustion, Huston, TX, USA; 1985. p. 1208–18.
Iisa K, Salokoshi P, Hupa M. Heterogeneous formation and destruction of nitrous oxide under fluidized bed combustion conditions. In: Proceedings of the 11th international conference on fluidized-bed combustion, New York, USA; 1991. p. 1027–33.
Lin WG, Johnsson JE, Dam-Johansen K, van den Bleek CM. Interaction between emissions of sulfur-dioxide and nitrogen-oxides in fluidized-bed combustion. Fuel. 1994;73(7):1202–8. CrossRef
Li TJ. Experimental study on NO reduction by NH 3 in desulfurization with Ca-based sorbent at moderate temperatures. Beijing: Tsinghua University; 2008.
Xinfang Y, Bo Z, Shujuan W, Yuqun Z, Changhe C. Simultaneous removal of SO 2 and NO x by calcium-based sorbent with NH 3 injection at moderate temperatures. J Tsinghua Univ (Sci Technol). 1994;51(2):272–6, 281 (in Chinese).
Johnsson JE. Formation and reduction of nitrogen oxides in fluidized-bed combustion. Fuel. 1994;73(9):1398. CrossRef
Furusawa T, Tsujimura M, Yasunaga K, et al. Fate of fuel bond nitrogen within fluidized bed combustor under staged air firing. In: Proceedings of the 8th international conference on fluidized-bed combustion, Huston, TX, USA; 1985. p. 1095–104.
Zijlma GJ, Jensen AD, Johnsson JE, et al. NH 3 oxidation catalysed by calcined limestone – a kinetic study. Fuel. 2002;81(14):1871–81. CrossRef
Tang JS, Song Q, Gao P, et al. Study on NH 3 oxidation from using SNCR to control cement kiln NO x . J Tsinghua Univ (Sci Technol). 2011; 12(6) (in Chinese).
Li TJ, Zhuo YQ, Chen CH, et al. Simultaneous on-line FTIR measurements of multicomponent pollutants in wet gas mixture. J Tsinghua Univ (Sci Technol). 1994;34(2):1–7 (in Chinese).
- Study on the Influence of CaO on NH3 + NO + O2 Reaction System in Pre-calciner
J. S. Tang
S. L. Fu
X. Y. Wu
- Springer Berlin Heidelberg