抄録
A pebble bed gasifier is composed of entrained flow section and packed bed section of ceramic balls (pebble bed section), and it has three main features : high efficiency of slag capturing; assurance of long reaction time; and thermal buffer function of the pebble bed. High temperature air is used as an oxidant to obtain high enough temperature inside of the gasifier to melt ash and realize tar free gasification. Two kinds of biomass samples were used as fuels in the gasification experiments. These were dried wood chips and carbonized fowl droppings, corresponding to high and low volatile matter fuel, respectively. It was shown that the carbon conversion rates were 96% and 80%, the cold gas efficiencies were 62% and 53% and the HHVs were 5.49MJ/m^3N and 3.50MJ/m^3N for each biomass sample, respectively.
