生物质焦与煤共气化特性研究

本文利用非等温热重分析法研究了生物质焦与煤的共气化特性,探讨了生物质焦与煤共气化反应特征温度的变化情况,并分别运用Doyle和Coats-Redfern近似函数计算了反应动力学参数.采用Doyle法计算时,相关系数R2值比Coats-Redfern法更大,因此Doyle法计算结果更合理.采用Doyle法计算出：生物质焦的气化反应活化能为134.97 kJ/mol,烟煤和无烟煤分别是197.85 kJ/mol和171.36 kJ/mol.随着无烟煤、烟煤中生物质焦掺混的比例增加,反应活化能不断下降.研究结果表明：生物质焦可以促进两种煤的气化反应,降低煤的最终反应温度和气化反应活化能.

On the characteristics of co-gasification of coals and biomass char

This paper studies the co-gasification reaction of biomass char and coals by non-isothermal thermo gravimetric analysis. The change of the characteristic temperature of co-gasification reaction was investigated, while Doyle and Coats-Redfern approximate functions could be used to simulate kinetics parameters of the reaction. The data calculated by using Doyle method hold a higher value of R2 than the Coats-Redfern method. The Doyle method is more reasonable. In Doyle method, the apparent activation energy of the biomass char used is about 134.97 kJ/mol,while the bituminite is 197.85 kJ/mol and the anthracite is 171.36 kJ/mol. As the weight rate of biomass char added in coals become larger, the apparent activation energy become smaller. It was concluded that biomass char can make a promote role in coals＂ gasification process through lowing the final reaction temperature and the apparent activation energy.