煤焦与生物质焦共气化反应特性研究

Co-gasification properties of coal char and biomass char

以晋城无烟煤和生物质(肉骨粉Meat and Bone Meal:MBM)为原料,在固定床上采用快速热解法制备了煤和生物质焦样。采用扫描电子显微镜结合X射线能谱分析仪(SEM-EDX)分析了煤焦和MBM焦的表面形态和组成;在热天平上采用等温热重法进行了煤焦/MBM焦混合物的水蒸气气化研究。实验结果表明,煤/MBM焦混合物的共气化实验碳转化率高于两者不存在协同作用时的计算值,这是由于MBM焦含有较多的Na、Ca等元素,这些物质对煤焦气化起到了催化作用。当对MBM焦进行脱灰处理后,其气化反应性显著下降。混合物中MBM焦的质量分数在20%～80%时,随着MBM焦含量的增加,混合物中的煤焦反应性相应提高。

An experimental study on the co-gasification property of coal char and biomass char with steam was performed in a thermogravimetric analyzer（TGA）.The coal tested was Jincheng anthracite（JC）,and the biomass was meat and bone meal（MBM）.The chars were prepared by fast pyrolysis of coal and MBM individually.The morphology and composition of chars were analyzed by scanning electron microscope（SEM） equipped with an energy-dispersive X-ray analyzer（EDX）.The results show that the co-gasification rate of JC/MBM chars mixture is higher than that of results expected from independent behavior.The high content of Ca and Na in MBM char plays a catalytic effect during co-gasification.After washing with acid,the reactivity of MBM char declines markedly.The gasification rate of coal char in JC/MBM chars mixture increases with increasing MBM char content in rang of 20%～80%.