Abstract
The objective of this work is to assess the effects of furnace chamber shape (by changing the angle α between the furnace roof and sidewall) on the MILD (moderate or intense low-oxygen dilution) combustion characteristics for natural gas using high temperature air (1573 K) with the aid of CFD simulations. The present simulations agree well with the previous experimental results, and some new findings are revealed. For instance, when increasing angle α under the present furnace-burner conditions, stronger recirculation, smaller temperature gradient as well as larger reaction zone are obtained, indicating the easier establishment of MILD combustion. In contrast, the combustion regime transforms from MILD combustion towards flame combustion in the stability limits of diffusion combustion provided by Wünning et al. (Prog. Energy Combust. Sci. 23 (1997) 81-94) when reducing angle α. It is also suggested that there is a critical value for angle α below which MILD combustion cannot be established under the present conditions.
Original language | English |
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Pages (from-to) | 64-75 |
Number of pages | 12 |
Journal | Applied Thermal Engineering |
Volume | 76 |
Early online date | 13 Nov 2014 |
DOIs | |
Publication status | Published - 5 Feb 2015 |
Externally published | Yes |
Keywords
- Furnace chamber shape
- MILD combustion
- NOx emission
- Numerical simulation
ASJC Scopus subject areas
- Energy Engineering and Power Technology
- Industrial and Manufacturing Engineering