Study On Experimental Research And Numerical Simulation On Heat Transfer Of The Radiant Section Of A Cylindrical Pipe Furnace

A new way of swirling combustion was presented in this paper. A radiant tapered wall was placed in the center of the swirl in order to enhance the heat transfer.A compare experiment was made between traditional combustion method and the swirl combustion method. The result showed that the swirl played a more effective part in combustion. The heat transfer was improved in the middle and at the bottom of furnace and the temperature of outer smoke drops. The same result was also got using water as the heat transfer fluid.This paper also presented numerical simulation results of traditional and new swirling fluid flow. The velocity field showed that mixing homogeneity were improved, retention time of the fuel and air were extended by the swirl. The flow-guide characteristics of the tapered wall showed its superiority.Three dimensional numerical simulations of the four direct bottom up combustion and swirling combustion method were made for the radiant section of furnace. The results with the models were in well agreement with the measurements of temperature from top to down. The different methods were comparable. It was showed that temperature field distribution of the swirling method was much better.. The radiant tapered wall not only keep proper distance to the pipe, but also guide the high temperature gas around the pipe, so the heat transfer in the middle and at the bottom of the furnace was directly improved. The swirl also extend the high temperature smoke's retention time at the top of the furnace, enhanced the heat transfer without question, and dropped the temperature of outer smoke.