Effect of fuel blend composition on hydrogen yield in co-gasification of coal and non-woody biomass. (29th January 2020)

• Record Type: Journal Article
• Authors: Cabuk, Busra; Duman, Gozde; Yanik, Jale; Olgun, Hayati
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 5(2020)
• Page Start: 3435
• Page End: 3443
• Publication Date: 2020-01-29
• Subjects: Steam gasification -- Co-gasification -- Torrefaction -- Hydrogen; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.02.130
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In this study, torrefaction of sunflower seed cake and hydrogen production from torrefied sunflower seed cake via steam gasification were investigated. Torrefaction experiments were performed at 250, 300 and 350 °C for different times (10–30 min). Torrefaction at 300 °C for 30 min was selected to be optimum condition, considering the mass yield and energy densification ratio. Steam gasification of lignite, raw- and torrefied biomass, and their blends at different ratios were conducted at downdraft fixed bed reactor. For comparison, gasification experiments with pyrochar obtained at 500 °C were also performed. The maximum hydrogen yield of 100 mol/kg fuel was obtained steam gasification of pyrochar. The hydrogen yields of 84 and 75 mol/kg fuel were obtained from lignite and torrefied biomass, respectively. Remarkable synergic effect exhibited in co-gasification of lignite with raw biomass or torrefied biomass at a blending ratio of 1:1. In co-gasification, the highest hydrogen yield of 110 mol/kg fuel was obtained from torrefied biomass-lignite (1:1) blend, while a hydrogen yield from pyrochar-lignite (1:1) blend was 98 mol/kg. The overall results showed that in co-gasification of lignite with biomass, the yields of hydrogen depend on the volatiles content of raw biomass/torrefied biomass, besides alkaline earth metals (AAEMs) content. Highlights: Torrefied biomass, instead of raw biomass, is an attractive feedstock for hydrogen production. Addition of biomass and its chars enhances gasification activity of lignite. Synergy in co-gasification does not only depend on alkali contents in biomass. Hydrogen was produced from blends of torrefied biomass and coal by steam gasification.