生物质和煤共热解特性及催化剂对热解的影响

Co-pyrolysis Characteristics of Biomass and Coal and Influence of Catalyst on Pyrolysis

为研究生物质和煤程序升温共热解特性及相互作用,利用热天平和管式炉反应器对白松木屑和五彩湾烟煤的共热解特性及催化剂对生物质和煤共热解的影响进行了研究,并考察了共热解半焦的孔结构特性。结果表明:不同比例的生物质和煤在共热解过程中,两者基本保持了各自的热解特性,由于生物质和煤的主要热解阶段温度相差较大,共热解过程中没有发生明显的协同作用。生物质和煤共热解半焦产率实验值大于计算值,当生物质质量分数从75%减少至25%时,半焦产率实验值与计算值之间的差值从0. 81个百分点增加到1. 07个百分点。橄榄石和载镍橄榄石(NiO/olivine)的添加促进了共热解反应发生的深度。载镍橄榄石催化剂添加(原料和催化剂质量比1:1)的条件下,共热解碳转化率提高了0. 5%～5. 1%,随着混合物中生物质比例的增加,催化剂的催化效果更加明显。

Co-pyrolysis characteristics of pine sawdust and Wucaiwan coal were studied with thermogravimetric analyzer and fixed bed.The effects of catalyst on co-pyrolysis of biomass and coal and the pore structure characteristics of co-pyrolysis char were investigated.The results showed that the pyrolysis characteristics of individual biomass and coal during co-pyrolysis were maintained and there was no synergetic effect in the co-pyrolysis due to different pyrolysis temperature region of the individual biomass and coal.Experimental yields of co-pyrolysis char was higher than the calculated values.The difference between the experimental char yield and the calculated value increased from 0.81 percentage points to 1.07 percentage points with reducing the biomass mass ratio from 75%to 25%.The addition of olivine and olivine supported nickel catalyst(NiO/olivine)promoted the co-pyrolysis reaction.Under the condition of NiO/olivine catalyst addition(the mass ratio of raw material and catalyst 1∶1),the co-pyrolysis carbon conversion rate increased by 0.5%to 5.1%.The catalytic activity increased with the increase of biomass ratio in the blend.