烘焙芝麻秸秆与煤混合燃烧特性及动力学研究

Study on combustion characteristics and kinetics of torrefied sesame straw and coal

文章以烘焙芝麻秸秆(torrefied sesame straw,TSS)和煤为研究对象,通过热重分析法研究不同掺混比例和不同升温速率下样品的燃烧特性,利用Flynn-Wall-Ozawa(FWO)法和Kissinger-Akahira-Sunose(KAS)法计算样品的活化能大小。研究结果表明:烘焙预处理有利于燃烧反应的进行;烘焙芝麻秸秆的掺混有助于改善混合物样品的燃烧性能;升温速率的提高会产生热滞后现象,但对样品的总失重影响不大;烘焙芝麻秸秆与煤混合燃烧时会出现协同效应,且高温阶段更加显著;烘焙芝麻秸秆掺混比为70%的混合物样品活化能最小,FWO法和KAS法计算的活化能分别为60.51、51.43 kJ/mol。

The combustion characteristics of torrefied sesame straw(TSS)and coal were studied by thermogravimetric analysis under different mixing ratios and heating rates.The activation energies of the samples were calculated by Flynn-Wall-Ozawa(FWO)and Kissinger-Akahira-Sunose(KAS)methods.The results show that torrefying pretreatment is beneficial to the combustion reaction.The mixing of TSS can improve the combustion performance of the mixture.The increase of heating rate can produce thermal hysteresis,but it has little effect on the total weight loss of the samples.The synergistic effect will appear in the mixed combustion of TSS and coal,and it is more significant in the high temperature stage.The activation energies of the mixture with 70%TSS are the lowest,which are 60.51 kJ/mol for the FWO method and 51.43 kJ/mol for the KAS method.