Influence mechanism of flow parameters on temperature field in the regenerative reheating furnace

Abstract

Aimed to the complex characteristics of regenerative pusher reheating furnace, the time-domain coupling relationship of burner layout, injection angle, air-gas ratio was simulated to analyze the influence of flow field on the transient temperature field and the smoke emission. Firstly, according to actual flow rules under different section conditions, the equivalent heat transfer of convection and radiation was the key for establishing the combustion model. Secondly, more details of complex flow fields were provided by the finite element method, which explained the dynamic heat transfer effect on at different atmospheres of furnace by the burner angle, the preheating temperature and the air-gas ratio. Industrial cases testified that new method obviously improved the stability of furnace temperature and pressure. When the average gas flow was reduced by 5.4% and the average furnace pressure was reduced by 12.5%, the average temperature difference was able to control within ±1 °C. Remarkably, the better flow field improved the prediction accuracy of temperature field, which could avoid some problems such as the insufficient burning, the over burning, the overheating and so on. Moreover, it also significantly reduced the gas consumption, the pollutant emission and the oxidative loss. Thus, new method aimed to meet strict index requirements of energy conservation and environmental protection to a large extent.