Department of Chemical Engineering, University of Castilla-La Mancha, Avda. Camilo José Cela 12, 13071 Ciudad Real, Spain.
Bioresour Technol. 2013 Feb;130:321-31. doi: 10.1016/j.biortech.2012.12.002. Epub 2012 Dec 12.
Pyrolysis, combustion and gasification characteristics of Nannochloropsis gaditana microalgae (NG microalgae) were investigated by thermogravimetric analysis (TGA). NG microalgae pyrolysis and combustion could be divided into three main stages: dehydration, proteins and polysaccharides degradation and char decomposition. The effects of the initial sample mass, particle size and gas flow on the pyrolysis and combustion processes were studied. In addition, gasification operation conditions such as temperature, initial sample mass, particle size, sweep gas flow and steam concentration, were experimentally evaluated. The evolved gases were analyzed online using mass spectroscopy (MS). In pyrolysis and combustion processes, most of the gas products were generated at the second degradation step. N-compounds evolution was associated with the degradation of proteins. Furthermore, SO(2) release from combustion could be related to sulphated polysaccharides decomposition. The main products detected during gasification were CO(2), CO, H(2), indicating that oxidation reactions, water gas and water gas shift reactions, were predominant.
采用热重分析（TGA）研究了盐藻（NG 微藻）的热解、燃烧和气化特性。NG 微藻的热解和燃烧可分为三个主要阶段：脱水、蛋白质和多糖降解以及炭分解。研究了初始样品质量、粒径和气流对热解和燃烧过程的影响。此外，还通过质谱（MS）在线分析了热解和燃烧过程中产生的气体产物。在气化操作条件下，如温度、初始样品质量、粒径、扫气流量和蒸汽浓度等，进行了实验评估。在热解和燃烧过程中，大部分气体产物是在第二步降解过程中产生的。氮化合物的释放与蛋白质的降解有关。此外，燃烧过程中 SO2 的释放可能与硫酸化多糖的分解有关。气化过程中主要检测到的产物是 CO2、CO、H2，这表明氧化反应、水煤气反应和水汽变换反应占主导地位。
