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Study on strengthening combustion and NO x formation properties of rough‐surfaced bluff‐bodies
Author(s) -
Ma Xiaoqian,
Lu Wei,
Zhang Xiaobing,
Yang Zeliang
Publication year - 2001
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.729
Subject(s) - bluff , nox , combustion , mechanics , combustor , turbulence , ignition system , autoignition temperature , materials science , thermodynamics , chemistry , physics , organic chemistry
Abstract A new type of pulverized coal burner combining a bend with a rough surface taper 60° bluff‐body has been designed. The cold state test showed that behind the rough‐surfaced bluff‐body there exists a larger recirculation zone, recirculation ratio and stronger turbulence, but its pressure drop increases by about 15–20 per cent more than that of the smooth‐surfaced bluff‐body. The hot state test in a one‐dimensional furnace indicates that the rough‐surfaced bluff‐body has much faster ignition, higher flame temperature and higher burnout ratio. A heat balance model was established using a lumped parameter method for the recirculation zone. Through it, the condition of the primary air was derived for flame stability and the strengthening combustion ability of rough surface in bluff‐body was proved. On the basis of a hot state test, numerical stimulation was performed on NO x formation. This suggests that rough‐surfaced bluff‐body only increases the production of NO x a little. Copyright © 2001 John Wiley & Sons, Ltd.