Abstract
In Japan, 7.50 million tons of rice straw was incinerated and plowed under soil. This abundant resource of rice straw is useful as alternative energy for recycling-based societies and also in possibly activating agriculture that is dependent on local production for local consumption. We aimed to effectively use unutilized rice straw by producing Bio-coke, which is a new briquette (in the rest of this document referred to as the BIC) with high density and hardness, and evaluated characteristics of rice straw BIC because the relationship between specific gravity and specific surface area of BIC is not well known. Additionally, it is seems that the specific gravity and specific surface area at the periphery of BIC may affect its combustion characteristics. In this study, one of the aims is that BICs are produced with various specific gravity and specific surface area as a parameter. It was confirmed to be able to produce BIC with different specific gravity and specific surface area at the periphery of BIC by changing manufacturing conditions of BIC and be led the relationship between the specific gravity and the specific surface area. After that, it was examined that difference of the specific gravity or the specific surface area at the periphery of BICs relates the ignition delay time as one of the combustion characteristics derived from burning BIC with different specific gravity. As a result, it was led that the relationship between the specific gravity or the specific surface area at the periphery of BICs and the ignition delay time was a direct proportional relationship.
