Abstract
In order to realize the waste heat recovery of the high-temperature semi-cokes, the heat exchanger with one time heat transfer was put forward and the fractal heat conduction model was established for the first time. The internal structure of semi-cokes with different diameters in the heat exchanger was analyzed, and the internal structure was taken into account in the fractal heat conduction model. Furthermore, the fractal heat conduction model is demonstrated through the experiment, and it is compared with the traditional volume average model. The results showed that, the internal structure of semi-cokes in the heat exchanger determines the fractal heat conduction characteristics, and the influence of porosity on the equivalent thermal conductivity calculated by the fractal heat conduction model is less than the fractal dimension and the contact resistance number. The equivalent thermal conductivity calculated by the fractal heat conduction model is closer to experimental values than that calculated by the traditional volume average model, and the error of the equivalent thermal conductivity between the experimental values and the fractal heat conduction model is less than 6%, thus the fractal heat conduction model is valid and feasible.
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