生物质半焦燃烧特性实验研究

为了提高生物质秸秆利用率,以小麦秸秆和玉米秸秆为研究对象,在400、450℃的炭化温度下制备了小麦秸秆和玉米秸秆半焦。采用TG-DTA热分析联用技术研究了升温速率、氧浓度对半焦反应动力特性的影响,建立了反应动力学模型,获得了不同工况下的频率因子及活化能。实验结果表明：活化能随着升温速率的变大及氧浓度的提高而略微减小;频率因子受升温速率以及燃烧氛围影响较大,氧气浓度越高则频率因子越大;升温速率越快则频率因子越大。

Experimental study on combustion characteristics of biomass char

To improve the utilization ratio of biomass straw,taking wheat straw and corn straw as research objects,wheat straw and maize straw char were prepared under 400 ℃ and 450 ℃ respectively,TG-DTA thermal analysis technology was applied to investigate the influence of heating rate and combustion atmosphere on combustion characteristics of the char,then obtained the reaction kinetics equation.The frequency factor and activation energy under different conditions were calculated.The results show that,activation energy is hardly affected by heating rate or combustion atmosphere.On the contrary,heating rate and combustion atmosphere have a profound impact on frequency factor.The higher oxygen concentration,the greater the frequency factor,the faster heating rate,the greater frequency factor.