Kinetics, thermodynamics and gas evolution of atmospheric circulating fluidized bed coal gasification fly ash combustion in air atmosphere

The activation energy of samples was calculated using the model-free method and the model method (typically 46 mechanism functions). The model method is suitable for water scrubbing ash (WSA), and the model-free method is suitable for raw coal (RC), dry ash (DA) and WSA. In the model-free method, the Kissinger method not only guarantees the accuracy of the reduction activation energy E value, but also takes into account the calculation amount of the replacement. The Kissinger method is the better method for the replacement activation energy E value. The average estimated value of DA's E of Kissinger method is 107.89 kJ/mol, which is lower than 143.30 kJ/mol of Yangquan anthracite. The average estimated value of WSA's E is 82.10 kJ/mol, which is slightly higher than that of lean coal (77.54 kJ/mol). It shows that the combustion performance of DA is better than that of Yangquan anthracite, and the combustion performance of WSA is equivalent to that of lean coal. Comprehensive combustion characteristics and gas emission results show that the CGFA has combustibility and utilization value.

Automated summary

The study calculated the activation energy of different samples using model-free and model methods, showing that dry ash (DA) has better combustion performance compared to Yangquan anthracite, while water scrubbing ash (WSA) performs similarly to lean coal. Comprehensive analysis of combustion characteristics and gas emissions suggests that CGFA has combustibility and utilization value.