Integral regenerator/burners

Fig. 1.15. Crucible or pot furnace. Tangentially fired integral regenerator-burners save fuel, and their alternate firing from positions 180 degrees apart provides even heating around the pot or crucible periphery. (See also fig. 3.20.)...

Fig. 5.28. Tilting batch aluminum melting furnace with a pair of Integral regenerator-burners for heat recovery. Courtesy of Degulsa S.A.

The earlier plants operated at deficit, and needed an auxiliary boiler, which was integrated in the flue gas duct. Auxiliary burners in tunnels or flue gas duet were additionally used in some instances. This situation was partially caused by inadequate waste heat recovery and low efficiency in some energy consumers. Typically, the furnace flue gas was discharged in the stack at rather high temperature because there was no air preheating and too much of the reaction heat in the synthesis loop was rejected to the cooling media (water or air). In addition, efficiency of the mechanical drivers was low and the heat demand for regenerating the solvent from the C02 removal unit (at... 

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