Development of White-Biocoalbriquettes with High Desulfurization Function

Abstract

To control the pollutant emission from coal combustion from both domestic stoves and middle- and small-scale boilers in some developing countries, an artificial solid fuel called biocoalbriquette was researched and developed experimentally. However, it is necessary to further increase the desulfurization efficiency of the biocoalbriquette in order to effectively popularize it in these countries. For this reason, white-biocoalbriquette was proposed and researched in this study for a more effectively and economically artificial solid fuel. This white-biocoalbriquette is a composite solid fuel of both coal and biomass. A little limestone is mixed in its inside, and its surface is coated by a thin layer of desulfurizer. The white-biocoalbriquette looks white and will change people's traditional concept of coal from black and dirty to new and clean. The experimental results show that the white-biocoalbriquette has successfully improved the desulfurization characteristics for this kind of artificial solid fuel from coal due to effectively controlling SO2 emission in both volatile combustion and char combustion. The temperature fluctuation in a combustion chamber hardly has an obvious influence on the desulfurization efficiency. Finally, the desulfurization efficiency of the white-biocoalbriquette has been achieved nearly 90%. At present, it is the highest desulfurization efficiency in a dry desulfurization process.