Effect of oxygen-rich combustion conditions on heating process of slab in reheating furnace
Compared with traditional air combustion,oxygen-enriched combustion can increase the flame temperature,strengthen the radiation heat transfer in the furnace,reduce the exhaust heat loss,increase the volume fraction of CO2 in the flue gas,and is conducive to CO2 capture,so it has become a hot spot in the field of industrial furnace research.At present,most studies simply transform the whole heating furnace from conventional air combustion to oxygen-rich air combustion,and are limited to the single factor of oxygen volume fraction.In order to explore the influence of different oxygen-rich combustion arrangement forms and different oxygen volume fractions on the heating furnace thermal characteristics and slab heating process,two oxygen-rich combustion models(JC-1 and JC-2)with oxygen volume fraction of 21vol％～49vol％are established to study the effects of combustion of gas and fuel on the thermal characteristics of the furnace and slab heating characteristics by numerical simulation.The results show that compared with the JC-1 condition,the temperature distribution in the furnace under JC-2 condition is more uniform and the slab temperature is higher,so the oxygen-rich combustion arrangement under JC-2 condition is better than that under JC-1 condition.Slab temperature and furnace thermal efficiency increase with the increase of oxygen enrichment volume fraction,but the increase rate decreases gradually.When the oxygen volume fraction is between 21vol％and 37vol％,the heating furnace slab temperature and furnace thermal efficiency increase at a higher rate.In this volume fraction range,when the oxygen volume fraction of JC-1 and JC-2 increases by 1％,the furnace thermal efficiency increases by 0.44％and 0.47％,and the energy saving rate increases by 1.07％and 1.12％,respectively.Therefore,37vol％is the optimal oxygen volume fraction for oxygen-enriched combustion.The significance of this study is to provide reference for the existing reheating furnace to implement the transformation of oxygen-rich combustion.
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