Waste-to-hydrogen via CO2/steam-enhanced gasification of spent coffee ground

Cleaner Chemical Engineering Pub Date : 2022-12-01 DOI:10.1016/j.clce.2022.100082

Juliana Petrocchi Rodrigues , Grace F. Ghesti , Edgar A. Silveira , Giulia Cruz Lamas , Ricardo Ferreira , M. Costa

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引用次数: 5

Abstract

This paper evaluated steam and CO₂-enhanced gasification of spent coffee ground (SCG) biomass, including energy and exergy aspects focusing on hydrogen production. The waste-to-hydrogen (WTH) conversion was performed via gasification (1000 °C) with a drop-tube-reactor investigating six different steam to biomass (SBR of 0.5, 0.8 and 1.2) and CO₂ to biomass (CO₂BR 0.09, 0.18 and 0.27) ratios. The syngas production indicated clear improvement against O₂/N₂ with an H₂ yield increase up to 69.21% and 18.32% for steam and CO₂ mediums. The energy and exergy analysis points out the 0.8 SBR as the optimum condition with 210% CGE and 48.05% exergy efficiency for H₂ production. As a strategy for carbon capture and usage, the medium with 0.27 CO₂BR provided a 28.52% exergy efficiency for H₂ production and reduced soot formation, showing a potential gasification medium for SCG. Results encourage waste-to-hydrogen prospection within circular economy principles, boosting circular economy principles in urban districts.

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通过二氧化碳/蒸汽强化气化废咖啡渣将废物转化为氢

本文评估了废咖啡渣(SCG)生物质的蒸汽和二氧化碳增强气化，包括能源和火用方面，重点是制氢。通过气化(1000°C)，在落管式反应器上进行废物制氢(WTH)转化，研究了6种不同的蒸汽与生物质(SBR为0.5、0.8和1.2)和二氧化碳与生物质(CO2BR为0.09、0.18和0.27)的比例。在O2/N2条件下，合成气产量明显提高，在蒸汽和CO2介质下，H2产率分别提高了69.21%和18.32%。能量和火用分析表明，以0.8 SBR为最佳产氢条件，CGE为210%，火用效率为48.05%。作为碳捕获和利用策略，CO2BR为0.27的介质可提供28.52%的制氢效率和减少烟尘形成，显示出潜在的SCG气化介质。结果鼓励在循环经济原则下的废物制氢前景，促进城市地区的循环经济原则。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Cleaner Chemical Engineering

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