Comparative indexes, fuel characterization and thermogravimetric- Fourier transform infrared spectrometer-mass spectrogram (TG-FTIR-MS) analysis of microalga Nannochloropsis Oceanica under oxidative and inert torrefaction

加热 傅里叶变换红外光谱 热重分析 惰性 化学 质谱法 表征(材料科学) 红外线的 傅里叶变换 材料科学 分析化学(期刊) 环境化学 化学工程 有机化学 热解 物理 色谱法 纳米技术 工程类 光学 量子力学
作者
Congyu Zhang,Shih‐Hsin Ho,Wei‐Hsin Chen,Rupeng Wang
出处
期刊:Energy [Elsevier]
卷期号:230: 120824-120824 被引量:24
标识
DOI:10.1016/j.energy.2021.120824
摘要

The torrefaction performances of microalga Nannochloropsis Oceanica under oxidative and inert atmospheres are characterized and compared with each other based on several operating parameters. By conducting several comparative indexes, the results suggest that oxidative torrefaction is more capable of upgrading microalgae due to its relatively lower solid yield and energy input, as well as relatively higher enhancement factor and upgrading energy index. Compared to inert torrefaction, the indexes indicate that oxidative torrefaction at 250 °C for 30 min has higher energy yield (1.02 times) and energy efficiency (2.2 times) but whereas lower energy input (0.4 times). With increasing torrefaction severity, the pyrolysis curve gradually becomes smooth and shift to a high-temperature zone. The peak temperatures of torrefied microalgae present an increasing trend, especially in the oxidative atmosphere. After oxidative torrefaction, microalgal solid biofuel is upgraded as peat and lignite, from the viewpoint of elemental composition. Furthermore, oxidative torrefaction is more suitable than inert torrefaction for producing bio-oil which mainly contains dianhydromannitol, neophytadiene, and palmitoleic acid. The TG-FTIR-MS results uncover the pyrolysis characteristics and reactivity of torrefied microalgae, and elucidate that oxidative torrefied microalgae is more reactive. • Comparative indexes between oxidative and non-oxidative torrefaction are conducted. • Oxidative torrefaction renders better microalgal energy density. • Oxidative mild torrefaction is the most energy-efficient. • The torrefied microalgae approach peat and lignite. • TG-FTIR-MS analysis suggests that oxidatively torrefied microalgae are more reactive.
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