NOVELTY - An internal circulated-type fluidized bed-type low-temperature catalytic gasification furnace apparatus has gasification chamber in which biomass feedstock is gasified, combustion chamber (7) which burns gas cracked residue of biomass feedstock from gasification chamber, heavy gas decomposition apparatus (14) in which catalyst accelerates decomposition or modification of heavy gas in the generated gas from gasification of biomass feedstock which is filled in interior of gasification chamber and another chamber which is partitioned by partition.    USE - Internal circulated-type fluidized bed-type low-temperature catalytic gasification furnace apparatus for treating livestock excretion (claimed).    ADVANTAGE - The internal circulated-type fluidized bed-type low-temperature catalytic gasification furnace apparatus is simple, economical and has excellent thermal efficiency.    DETAILED DESCRIPTION - An internal circulated-type fluidized bed-type low-temperature catalytic gasification furnace apparatus has gasification chamber in which the biomass feedstock is gasified in presence of gasifying agent, combustion chamber which burns the gas cracked residue of the biomass feedstock which moved through the inside of fluid bed from the gasification chamber, heavy gas decomposition apparatus in which the catalyst accelerates decomposition or modification of heavy gas in the generated gas from gasification of biomass feedstock which is filled in the interior of the gasification chamber and another chamber which is partitioned by the partition in presence of oxidizing agent. A lower end portion in chamber such that the fluid bed contains thermal medium in the gasifier. The thermal medium is circulateable through the lower side and is partitioned of by the partition embedded in the fluid bed. The apparatus in the gasification decomposition process of the biomass feedstock.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view of the internal circulated-type fluidized bed-type low-temperature catalytic gasification furnace apparatus.    Addition fuel (1)    Recovery heat (2)    Combustion gas (3)    Combustion chamber (4)    Heavy gas decomposition apparatus (7)