Hydrogen production through agro-residue gasification and adsorptive separation

Singh, A and Shivapuji, AM and Dasappa, S (2023) Hydrogen production through agro-residue gasification and adsorptive separation. In: Applied Thermal Engineering, 234 .

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Abstract

The present work reports on the characterization of mixed agro-residue pellets and their subsequent use for syngas generation in a laboratory-scale downdraft gasifier utilizing the mixture of oxygen and steam as the gasifying agent (equivalence ratio/steam to biomass ratio: 0.21/2.15). Pure hydrogen is realized in a vacuum pressure swing adsorption system using zeolite 13X adsorbent. Regarding pellets, the high ash content (11.46 ± 0.38 wt%) and the presence of inorganic elements (potassium, silicon, calcium) dictate gasification process level interventions. The key requirement established experimentally is maintaining the reactor temperature under 900 °C for a clinker-free operation. This prerequisite, accomplished through an optimized char-ash extraction rate, enables the consistent production of hydrogen-rich (42.2 ± 0.9 vol%) syngas with a lower heating value of 8.3 ± 0.2 MJ/Nm3 at a gross cold gas efficiency of 78.9%. The cyclic separation system operates at a pressure ratio of 7.5 and continually generates pure hydrogen with minimal contaminants. The oxy-steam gasification of high ash feedstock in a near-ambient fixed-bed reactor and its integration to a low-pressure swing adsorption system for practical multi-specie syngas separation with quality assessment of the produced hydrogen are the main novelty features.

Item Type:	Journal Article
Publication:	Applied Thermal Engineering
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to the Elsevier Ltd.
Keywords:	Gas contaminants; Hydrogen production; Mixed agro-residue pellets; Oxy-steam gasification; Syngas separation
Department/Centre:	Division of Mechanical Sciences > Centre for Sustainable Technologies (formerly ASTRA)
Date Deposited:	27 Nov 2023 08:52
Last Modified:	27 Nov 2023 08:52
URI:	https://eprints.iisc.ac.in/id/eprint/82874

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