Study on Thermodynamic Characteristics and Heat Transfer Method of Uncontrolled Fire in Coal Mine Gangue Mountain Spontaneous Combustion Based on System Dynamics

Figure 4

ln[(da/dt)/f(a)], ln[M(a)/T²], and 1/T curves of coal gangue 4# Phase III. Avrami−Erofeev function with differential form FOR (a), R² = 0.989, with integral form FOR (b), R² = 0.991.

(a)

(b)