Combustion Behavior of Coals in Rotary Kiln and Their Interaction on Co-combustion
2018
Zhong, Qiang | Zhang, Jian | Yang, Yongbin | Jiang, Tao | Li, Qian | Xu, Bin
In order to clearly reveal coal combustion behaviors and quantitatively evaluate using coal in a rotary kiln, combustion behaviors of four coals (C₁₃, C₂₃, C₃₂, and C₆ coals) and their blended coals were investigated. Meanwhile, their interactions and combustion kinetics were analyzed. The results showed that C₁₃ and C₂₃ coals having combustion characteristics of high heating value, suitable ignition temperature, burnout time and kinetic parameters (Eα and n) conform to the requirement of a rotary kiln. The partial substitution of C₂₃ coal for C₁₃ coal in the production is feasible, while the replacement of C₃₂ and C₆ coals for C₁₃ coal will affect coal combustion and result in production fluctuation because C₃₂ and C₆ coals have an effect on C₁₃ coal combustion. The blended coals have the similar characteristics of proximate analysis and heating value contrasting to C₁₃ coal, but they show different combustion behaviors that cannot be calculated in an additive manner. Their combustion behaviors show multiple combustion peaks and complex combustion kinetics if they are composed of different combustion behavior coals.
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