Impact of OFA on combustion and NOx emissions of a large-scale laboratory furnace fired by a heavy-oil swirl burner》.pdf

Applied Thermal Engineering 90 (2015) 994e1006 Contents lists available at ScienceDirect Applied Thermal Engineering journal homepage: /l ocate/apthermeng Research paper Impact of OFA on combustion and NOx emissions of a large-scale laboratory furnace fired by a heavy-oil swirl burner * Hao Zhou , Tao Ren, Yu Yang Zhejiang University, Institute for Thermal Power Engineering, State Key Laboratory of Clean Energy Utilization, Zheda Road 38, Hangzhou 310027, PR China h i g h l i g h t s Thermal test of HFO on a large-scale horizontal test rig. The appropriate position of the OFA tube was confirmed. The two-color pyrometry method was used to investigate temperature distribution. A 23.8% reduction of NOx emission obtained with in the test rig. The same level reduction of NOx emission verified in the industrial furnace. a r t i c l e i n f o a b s t r a c t Article history: Experiments were carried out on a horizontal test furnace to assess the overall air-staging combustion Received 28 July 2014 performance and NOx emissions of a large-scale laboratory furnace fired by a heavy-oil swirl burner. Accepted 29 July 2015 Impacts of over-fire air (OFA) parameters (including the OFA position and ratio) on NOx and CO emissions Available online 8 August 2015 were experimentally and numerically evaluated in the test furnace. The experimental results indicated that both the OFA ratio and positioned location affected NOx emissions during the heavy fuel oil