Abstract
Bio-oil is a promising fuel as one of the main products from biomass fast pyrolysis for improving energy density and reducing transportation cost, but high acidity and low calorific value limit its direct application. It can be used to prepare coal bio-oil slurry as partial green fuels for potential feeds for synthesis gas production via gasification with the advantages over traditional coal-water slurries of calorific values and being additives-free. In the present work, three bio-oils were blended with lignite to prepare slurry fuels for the investigation of the effect of bio-oil species on rheological behaviors and gasification characteristics of coal bio-oil slurry fuels. Results show that slurry prepared with bio-oil from fruit tree pyrolysis is highly viscous and has higher activation energy in gasification. Slurries prepared with bio-oils from straw pyrolysis and pyroligneous acid from wood pyrolysis exhibited an acceptably lower viscosity, and the gasification temperatures were lower than for coal. The activation energy decreased by 15.98 KJ/mol and 2.77 KJ/mol, respectively, which indicates these bio-oils are more suitable with lignite for slurries preparation.
Highlights
Biomass is utilized to prevent the shortage of depletable fossil energy carriers [1] and is considered to be a renewable and carbon-neutral resource
It could be used for preparation of slurry fuels with coal [4], biochar [5,6], or residual carbon floated from gasification slag [7]
Bio-oils are employed as a liquid phase for the substation of fluid in commercial coal water slurry aiming at both using the organic components providing calorific values and as additives for improving the viscosity and stability and further reducing the cost
Summary
Biomass is utilized to prevent the shortage of depletable fossil energy carriers [1] and is considered to be a renewable and carbon-neutral resource. Due to its complicated composition, lower heating value, and higher oxygen content and acidity, it cannot be used directly in combustion, extraction for fine chemicals, or transportation. It needs to be upgraded before utilization. Using bio-oil for the preparation of slurry fuels has been promising in recent years It could be used for preparation of slurry fuels with coal [4], biochar [5,6], or residual carbon floated from gasification slag [7]. Bio-oils are employed as a liquid phase for the substation of fluid in commercial coal water slurry aiming at both using the organic components providing calorific values and as additives for improving the viscosity and stability and further reducing the cost. Coal bio-oil slurries could be used for combustion for heat providing or gasification for syngas production [8,9,10]
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