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One of the most effective ways to deal with emissions is to deal with the problem at source, with in-furnace techniques. A particularly cost effective approach has proved to be [...]

High-temperature air combustion using the high-cycle generator is attracting great interest in mettalurgical industries. Flame configurations play a very important role when a modern regenerative burner system is adopted in an industrial furnace because multi-burners are required. Numerical studies of combustion in a semi-industrial scale test furnace equipped with two sets of two-flame high-cycle regenerative system have been performed and results were compared with experimental values. Influences of flame configurations on combustion properties and NO emissions of LPG with high-temperature air were numerical studies as well as excess air ratio. The flame volume and size were figured out by a parameter named as oxidation mixture ratio. It is found that the flame configurations have strong influences on the combustion and flame properties as well as NO emission. Increasing the excess air ratio leads to increasing of NO emission. Lesser the ratio of fuel/air injection momentum larger is the NO production.

High-temperature air combustion is attracting great interest in the metallurgical industry lately as its claimed benefits include large energy saving, low air emissions, increased product quality and increased productivity. This paper presents a numerical study of combustion performance in a semi-industrial test furnace equipped with a regenerative burner and with a conventional turbulent jet burner. The numerical calculation is also validated by experiment. In this regard, flow field was calculated with k -ɛ turbulence model, the model of combustion employed the eddy dissipation concept with a two-step mechanism to describe chemical reactions; radiation was handled using the discrete transfer method. The results indicate that equipping a furnace with high-cycle regenerative burner systems can provide more uniform gas temperature profiles, a higher energy utilizing efficiency, a low NO x emission, a larger flame, the low maximum local heat release and the possibility of low combustion noise.