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3-D Temperature Reconstruction of the Flame Field in a Tangentially Fired Furnace

Owing to the diversity and complexity of combustion flames in tangentially fired furnaces, now there is limited research on the monitoring of flames in such furnaces. According to the structural characteristics of a tangentially fired furnace, a synchronous image acquisition system for three wavelengths (566, 600, and 633 nm) is designed and constructed to acquire the images of the flame field from four different directions in the furnace. To obtain better reconstruction result, a comprehensive model of heat radiation is given. An algorithm for the 3-D reconstruction of the flame field in the furnace based on above acquisition system is proposed in this paper. First, the synchronous flame image collected is subject to splitting and filtering. Then, based on single-angle synchronous flame images at different wavelengths, the reconstruction of the flame field is performed to obtain the temperature distribution of the single-angle flame field. Finally, the synchro-furnace flame field obtained through the inversion calculation at four angles is refined to obtain an accurate 3-D distribution of the flame field. The problem of inversion error caused by radiation attenuation due to the distance between each point and cameras in the furnace is solved to some extent in this algorithm. The effectiveness and feasibility of the proposed algorithm are verified through experimental tests.