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Co-pyrolysis of microalgae and municipal solid waste: A thermogravimetric study to discern synergy during co-pyrolysis process
Journal of the Energy Institute ( IF 5.6 ) Pub Date : 2020-10-31 , DOI: 10.1016/j.joei.2020.10.010
S.S.V. Varsha , Arun K. Vuppaladadiyam , Farrukh Shehzad , Hosein Ghaedi , S. Murugavelh , Weiguo Dong , Elsa Antunes

Synergism during the co-pyrolysis of microalgae (CC), municipal solid waste (MSW), and their blends (CC/MSW) (w/w %), 25/75 (CM-1), 50/50 (CM-2), and 75/25 (CM-3), was evaluated based on thermal decomposition pattern, evolved gases, rate and extent of thermal decomposition, and kinetic parameters. Three stages of devolatilization attributed to dehydration, devolatilization of major structural compounds of biomass and decomposition of solid residues were noticed during the co-pyrolysis of biomass samples. The main pyrolysis stages for CC, MSW, CM-1, CM-2 and CM-3 were 175–520, 151-523, 164-504,168-510, 160–501 °C, respectively. Microalgae, CC, appeared to be thermally resistant, while MSW is noticed to be thermally sensitive. The kinetics analysis was studied by deconvoluting the DTG profile into independent stages, followed by application of isoconversional methods to evaluate the activation energy and the pre-exponential factor. Furthermore, the reaction mechanism of each stage was determined by using the master plot method. The semi-quantitative method was used to evaluate the evolved gases and CO, CO2 and H2 were noticed to be the dominant gas species. The obtained thermal and kinetic data for co-pyrolysis of microalgae and MSW can serve are basis for scale-up and reactor design of pyrolysis process for similar kind of waste streams.



中文翻译:

微藻类和城市固体废物的共热解:热重法研究,以识别共热解过程中的协同作用

微藻类(CC),城市固体废物(MSW)及其混合物(CC / MSW)(w / w%),25/75(CM-1),50/50(CM-2)共热解过程中的协同作用)和75/25(CM-3)是根据热分解模式,放出的气体,热分解的速率和程度以及动力学参数进行评估的。在生物质样品的共热解过程中,注意到了脱水的三个阶段,即脱水,生物质主要结构化合物的脱挥发分和固体残留物的分解。CC,MSW,CM-1,CM-2和CM-3的主要热解阶段分别为175-520、151-523、164-504、168-510、160-501°C。CC的微藻似乎具有耐热性,而MSW被发现对热敏感。通过将DTG曲线解卷积为独立阶段来研究动力学分析,然后应用等转换方法评估活化能和指数前因子。此外,通过使用主标绘法确定每个阶段的反应机理。使用半定量方法评估逸出的气体和CO,CO注意到2和H 2是主要的气体种类。所获得的微藻类与城市固体废弃物共热解的热力学数据可以为类似废物流的热解工艺规模化和反应器设计提供依据。

更新日期:2020-11-06
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