Abstract
In conventional pulverized coal fired furnaces, the coal particles with mean diameter about 50 μm can be heated up at the rate of (10)^3∿(10)^4℃/s. Heat diffusion performance in rapidly heated coal particles, characterized by the porous structure and rough surface, cannot be reasonably described by the classical Fourier heat diffusion theory. A novel method based on Non-Fourier heat diffusion theory for analyzing the rapid heating up process of coal particles before volatile evolution commences is proposed. The advantages of the proposed prediction procedures over the previous analyzing methods are discussed. Two different models based on Non-Fourier heat conduction theory are applied, and the predicted surface temperature histories of D-P-L model present good agreement with the available measured results.
