Oxidation device, oxidation method, and method for producing modified fuel

An oxidation method for oxidizing a raw material containing at least one of carbonized coal and a torrefied biomass using an oxidation equipment having a main body unit forming a fluidized bed, the method comprising:

• a gas supply step of supplying an oxygen-containing gas at 150° C. to 300° C. from a lower side to an upper side of the main body unit to form the fluidized bed in which the raw material flows;
• an oxidation step of oxidizing the raw material contained in the fluidized bed with the oxygen-containing gas in the main body unit;
• a cooling step of cooling an oxidized product obtained by oxidizing the raw material in a cooling unit;
• and
• a delivery step of delivering the oxidized product cooled in the cooling step from the cooling unit,
• wherein the delivery step controls a delivery amount of the oxidized product from the cooling unit based on a differential pressure between a pressure in a freeboard portion above the fluidized bed of the main body unit and a pressure in a portion of the main body unit through which the fluidized bed passes.

A method for producing a modified fuel from a raw material containing at least one of carbonized coal and a torrefied biomass using an oxidation equipment having a main body unit forming a fluidized bed, the method comprising:

• a gas supply step of supplying an oxygen-containing gas at 150° C. to 300° C. from a lower side to an upper side of the main body unit to form the fluidized bed in which the raw material flows;
• an oxidation step of oxidizing the raw material contained in the fluidized bed with the oxygen-containing gas in the main body unit to obtain the modified fuel;
• a cooling step of cooling the modified fuel obtained by oxidizing the raw material in a cooling unit;
• and
• a delivery step of delivering the modified fuel cooled in the cooling step from the cooling unit,
• wherein the delivery step controls a delivery amount of the modified fuel from the cooling unit based on a differential pressure between a pressure in a freeboard portion above the fluidized bed of the main body unit and a pressure in a portion of the main body unit through which the fluidized bed passes.