NOVELTY - The combustion boiler which uses a supercritical hydration reaction uses organic matter having a high water content such as biomass as a fuel and produces a high-temperature and high-pressure combustion fluid composed mainly of supercritical water.    USE - Supercritical water biomass combustion boiler for dispersion-type power plants.    ADVANTAGE - The power generation gas turbine can be directly driven by continuously producing a high-temperature and high-pressure combustion gas using biomass having a water content of about 90%. The power generation steam turbine can be driven by producing supercritical water by heat exchange, and can advantageously simplify the apparatus construction.    DETAILED DESCRIPTION - The combustion boiler which uses a supercritical hydration reaction uses organic matter having a high water content such as biomass as a fuel and produces a high-temperature and high-pressure combustion fluid composed mainly of supercritical water. The boiler produces stable heat output by dividing operation elements such as closing/pressure rising operation, constant pressure/temperature rising operation, combustion/temperature rising operation, steady combustion operation, and discharge/filling operation and operates the reactors. The boiler eliminates continuous supply of a solid fuel such as biomass into a high-temperature and high-pressure system and performs batch supply at solid fuel suppliable temperature and pressure. INDEPENDENT CLAIMS are included for the following:    (1) reactor that comprises heat insulation layer with ceramics formed in inner surface; and    (2) method of acquiring generated heat from organic matter which involves using supercritical hydration reaction. The non-combusted organic matter contained in the fluid is combusted completely. High temperature and high pressure fluid is generated. The supercritical water is circulated to the reactor under constant temperature.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view of the combustion boiler.    Oxygen introductory line (A)    Water introduction line (B)    Cooling water introduction line (C)    Outflow fluid line (D)    Drain line (E)