Aerodynamic characteristics within a cold small-scale model for a down-fired 350 MWe supercritical utility boiler at various primary air to vent air ratios

Chunlong Liu, Zhengqi Li, Xiang Zhang, Xinjing Jing, Wenzhen Zhang, Zhichao Chen and Qunyi Zhu

Energy, 2012, vol. 47, issue 1, 294-301

Abstract: Down-fired boilers currently suffer from a number of different issues including high levels of fly ash in the combustible matter, serious slagging and a high level of NOx emissions. In this study, the combustion system of a down-fired 350 MWe supercritical utility boiler was designed with multiple injections and multiple staging to experimentally investigate the impact of the primary air to vent air ratio on the aerodynamic field in the furnace. We constructed a cold 1:10 scale model of the down-fired boiler, and used this to compare the distribution characteristics of the furnace vertical velocity component along the horizontal direction, the decay curves of the downward airflow, and the effect of the secondary air supply ejector on the primary air. It was found that changing the ratio of primary air:vent air had very little effect on the downward flow. Taking the pulverized-coal concentration, the primary air velocity, and other factors into account, we found that the optimal ratio of primary air:vent air was 5:5.

Keywords: Down-fired boiler; Cold air-flow experiments; Primary air; NOx emission (search for similar items in EconPapers)
Date: 2012
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:47:y:2012:i:1:p:294-301

DOI: 10.1016/j.energy.2012.09.017

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