NOVELTY - Electric power generation method of fuel cell power generating device involves producing reformed gas, performing carbon monoxide (CO) modifying processing, generating electric power by reacting CO modified reformed gas and oxidizing agent gas, collecting waste gas condensed water, storing water, deionizing, storing, utilizing deionized water as cooling water for fuel cell main body, humidifying and separating reformed gas condensed water.    USE - Electric power generation method of fuel cell power generating device.    ADVANTAGE - Ammonia and methanol contained in reformed gas dissolved in reformed gas condensed water are discharged out of the system, microorganisms breeding in water tank and obstructing the water treatment apparatus is eliminated, microorganisms cannot breed easily due to high water temperature, condensed water separated from reformed gas is always discharged, reproduction of microorganisms can be suppressed and independence of fuel cell power generating device can be maintained without supplying city water from the exterior.    DETAILED DESCRIPTION - Electric power generation method of fuel cell power generating device involves steam reforming of raw fuel and producing reformed gas using a modifier with modification catalyst layer, supplying reaction heat to modification catalyst layer in the combustion part, performing CO-modifying processing of reformed gas using CO-modifying device, generating electric power by reacting CO modified reformed gas and oxidizing agent gas in the fuel cell main body, collecting waste gas condensed water from combustion exhaust gas discharged from combustion part of modifier and fuel cell waste gas emitted from fuel cell main body, storing water in water tank, deionizing with water treatment apparatus, storing in deionized water tank, utilizing deionized water as cooling water for fuel cell main body, humidifying water of oxidizing agent gas and reformed water, separating reformed gas condensed water using the drain provided in the flow path of reformed gas produced in modifier and CO modifying device, discharging reformed gas condensed water out of the system when the water level in water tank and/or deionized water tank is more than a predetermined value and supplying reformed gas condensed water in deionized water tank when the water level in water tank and/or deionized water tank is below a predetermined value. An INDEPENDENT CLAIM is included for fuel cell power generating device.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of fuel cell power generating device. (Drawing includes non-English language text).    Fuel cell main body (1)    Humidifier (2)    Modifier (3)    Modification catalyst layer (3a)    Combustion part (3b)    CO modifying device (3c)    Water tank (4)    Water treatment apparatus (10)