A GENERAL MODEL OF COAL PARTICLE DEVOLATILIZATION——FU-ZHANG MODEL

【摘要】 <正> A general model of coal particle devolatilization has been presented. The difference between the Fu-Zhang model and the previous ones is that the equivalent activation energy, E, and the equivalent frequency factor, K₀, of coal particle devolatilization are independent of the coal type, but depending only on the final temperature, T_∞ , and heating rate of the coal particles. The relationship between E/K₀ and T_∞ has been obtained and found universal for all coal ranks. The present model has been examined by using the experimental data of sixteen coal types. The comparison of calculations with experiments show that the Fu-Zhang model is able to predict more accurately the coal devolatilization at different heating rates, with different particle diameters and various coal types. This model can also be used for modelling coal devolatilization in fluidized beds.更多还原

【Abstract】 A general model of coal particle devolatilization has been presented. The difference between the Fu-Zhang model and the previous ones is that the equivalent activation energy, E, and the equivalent frequency factor, K₀, of coal particle devolatilization are independent of the coal type, but depending only on the final temperature, T_∞ , and heating rate of the coal particles. The relationship between E/K₀ and T_∞ has been obtained and found universal for all coal ranks. The present model has been examined by using the experimental data of sixteen coal types. The comparison of calculations with experiments show that the Fu-Zhang model is able to predict more accurately the coal devolatilization at different heating rates, with different particle diameters and various coal types. This model can also be used for modelling coal devolatilization in fluidized beds.更多还原