Abstract:

The co-gasification of coal and cyanobacteria is an important approach to achieve the resource utilization of cyanobacteria. The TG-FTIR combined technology was used to explore the co-gasification characteristics of different blending ratio mixtures under CO₂ atmosphere, which provided a theoretical basis for the application of chemical chain combustion technology. It is difficult to distinguish the drying stage and depolymerization stage in cyanobacteria, the polysaccharide of which was depolymerized in a low temperature of 100℃. During the pyrolysis stage, two weightlessness peaks were found in mixture samples corresponding to cyanobacteria and coal pyrolysis, respectively. The carbonyl and aromatics were the main gaseous products of cyanobacteria pyrolysis, and CO, CO₂ and hydrocarbons were mainly produced from coal pyrolysis. The pyrolysis and carbonization stages can be described by the homogeneous model. The kinetic parameters of gasification stage were fitted well by the shrinking core model. The influence of synergy effect was found limited in pyrolysis stage. However, a significant synergistic effect was observed in char gasification. The reactive activity of coal gasification was intensified by blending cyanobacteria.

Key words: biomass, co-gasification, reaction kinetics, syngas, evolution behavior

摘要：

煤与蓝藻共气化是兼顾煤炭高效利用与蓝藻资源化利用的重要途径。采用TG-FTIR联用技术，探究不同掺混比混合物在CO₂气氛下的共气化特性，为其应用化学链燃烧技术提供理论基础。实验表明，蓝藻多糖解聚温度低，于100℃便可析出气相产物。在热解阶段中，DTG曲线有两个失重峰，其中峰值大、温度低的由蓝藻热解产生，主要气相产物为羟基和芳香族化合物；温度较高的失重峰对应煤炭的热解，气相产物以CO、CO₂和烃类为主。均相模型适用于热解、炭化阶段，且对蓝藻的拟合度高于煤炭，而缩核模型对气化阶段和高煤炭比例样品的拟合效果好。共气化的协同作用起始于热解阶段，主要作用区间为气化阶段，掺混蓝藻可有效提高煤焦的气化活性。

关键词: 生物质, 共气化, 反应动力学, 合成气, 演变行为