Abstract
In this study, solid biomass is gasified in fluidized-bed reactors, to investigate the effect of various means on syngas composition, especially for enhancing hydrogen content in the production gas. Conventionally, air is supplied to the reactor as gasification medium, which inevitably results in a high nitrogen content in the syngas. Alternatively, steam or oxygen-rich gas can be supplied to improve the syngas characteristics. On the other hand, a so-called “indirect gasification technology” realizes the whole conversion processes in dual reactors, for combustion and gasification, respectively; moreover, solid materials are circulated through two reactors, while gaseous streams in between are separated from each other. Hence, this system features the advantage of producing near nitrogen-free syngas in the gasifier, with air as oxidant in the combustor. Baseline experiments with various operating parameters, including air equivalence ratio (ER) and temperature, were firstly performed in a 30 kWth bubbling fluidized-bed gasifier; then, trial tests were conducted with the aforementioned operational and constructional factors. The preliminary test data show positive trends for the enhancement of hydrogen generation via biomass gasification. Further efforts will be pursued to establish a data base, which would be beneficial to extensive researches on clean energy and carbon abatement technologies.
Highlights
With the ambitious goal set by the “Paris Agreement,” which aims at a level even below 2DS, a large amount emission of greenhouse gas (GHG), predominantly carbon dioxide (CO2), caused by anthropogenic impacts has been an environmental issue around the globe for the climate change
3.1 Baseline performance characteristics The baseline gasification experiments were performed in the 30 kWth bubbling fluidizedbed gasification system as shown in Figure 3, to investigate the effect of various operating parameters, including air equivalence ratio (ER) and temperature
Gasification experiments of biomass were performed in various fluidized-bed reactors to investigate the potential means for the enhancement of hydrogen generation
Summary
With the ambitious goal set by the “Paris Agreement,” which aims at a level even below 2DS (two-degree scenario), a large amount emission of greenhouse gas (GHG), predominantly carbon dioxide (CO2), caused by anthropogenic impacts has been an environmental issue around the globe for the climate change. Fluidized bed is one of the major platforms of biomass gasification It utilizes gasification-medium (air, steam, CO2 etc.) through the solid particles and makes them behave like fluid flow. A so-called “indirect gasification technology” realizes the whole conversion processes in dual reactors, for combustion and gasification, respectively; solid materials are circulated through two reactors, while gaseous streams in between are separated from each other (Fig. 1). This system features the advantage of producing near nitrogen-free syngas in the gasifier, with air as oxidant in the combustor. The solids within the dense-phase bed flow with a lower velocity through the orifice into the lean-phase bed, and ascend with a higher velocity over the weir into another dense-phase bed
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