Abstract
Bio-coke is a solid biofuel with a high density and high compressive strength. Demonstration tests have shown that bio-coke can be used as an alternative to coal and coal coke. The effects of biomass type and production conditions on combustion characteristics have been studied for small diameter bio-coke (φ50 mm or less). In this study, we focused on fuel size and investigated the combustion characteristics of φ12 to 100 mm samples. Experiments were conducted in a preheated, forced convection atmosphere using a batch-type vertical combustion apparatus to simulate rapid temperature increase and combustion under isothermal conditions in a gasification and melting furnace or blast furnace. Two biomass species (Japanese cedar and green tea) were selected as materials to study the effect of biomass species. We developed experimental correlations to predict the combustion time of bio-coke, considering the effects of scale and aspect ratio. The flaming and char combustion times of bio-coke can be approximated using the shape factor (V/S)n even when the aspect ratios are different. We obtained that the characteristic length is (V/S) to the power of 0.52–0.64. Furthermore, we found that Japanese cedar bio-coke has 2.5 times faster in flaming combustion than green tea bio-coke.
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