Pyrolysis apparatus and pyrolysis method

A pyrolysis apparatus for pyrolyzing a raw material in a fluidized bed formed of a fluidized medium, comprising:

• a fluidized-bed furnace;
• a first partition wall dividing inside of the fluidized-bed furnace into a pyrolysis chamber and a combustion chamber;
• a second partition wall dividing the combustion chamber into a main combustion chamber and a settling combustion chamber;
• a first gas diffuser, a second gas diffuser, and a third gas diffuser configured to supply a first fluidizing gas, a second fluidizing gas, and a third fluidizing gas to the pyrolysis chamber, the main combustion chamber, and the settling combustion chamber, respectively;
• a first raw-material supply device configured to supply a first raw material to the pyrolysis chamber with a first supply amount;
• a second raw-material supply device configured to supply a second raw material to the pyrolysis chamber with a second supply amount, the second raw material having a lower ratio of carbon to hydrogen and a lower ratio of carbon to oxygen than those of the first raw material;
• and
• an operation controller configured to independently control operations of the first raw-material supply device and the second raw-material supply device and configured to regulate a ratio of the first supply amount to second supply amount based on a temperature in the main combustion chamber or a temperature in the settling combustion chamber.