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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received July 28, 2008
Accepted January 5, 2009

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Numerical simulation of the influence of over fire air position on the combustion in a single furnace boiler with dual circle firing

Hiu Liu^{1 2†} Nana Xin² Qingxi Cao² Long Sha² Dezhi Sun¹ Shaohua Wu²

¹Postdoctoral Station of Environmental Science and Engineering, Harbin Institute of Technology, Harbin 150090, P. R. China ²School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China

liuhui@hit.edu.cn

Korean Journal of Chemical Engineering, July 2009, 26(4), 1137-1143(7), 10.1007/s11814-009-0189-4

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Abstract

The Computational fluid dynamics (CFD) code PHOENICS is applied to simulate and evaluate the combustion process within the furnace of a 1,000MW dual circle tangential firing single furnace lignite-fired ultra supercritical (USC) boiler. The dependence on overfire air (OFA) positioning on the combustion process is studied. The results show that the highest temperature appears on the upside of the burner zone close to the front wall, and the high temperature zone rises with elevated OFA positions. However, the temperature field distributions are similar despite_x000D_ differing OFA positions. The char content near the rear wall is higher than that near the front wall, and below the furnace arch, coal particles concentrate towards the front wall. Also with elevated OFA positions, nitrogen oxide (NOx) concentrations at the outlet fall, but char content increases. In regard to NOx emission and char burnout, the suggested optimal distance from the OFA center to the center of the uppermost primary air nozzle should be 6 meters.

Keywords

OFA Combustion NOx Numerical Simulation Dual Circle Tangential Firing

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