NOVELTY - A fuel-cell electric-power generation system consists of a battery cooling-water system for pouring battery cooling water for maintaining operating temperature of fuel-cell main component (5). A condensed-water generator is provided for cooling waste gas discharged from modification system or main component, and produce condensed water (11). An ion-exchange-resin tower (24) filled with anion-exchange resin (23b) and cation-exchange resin (23a) is provided for removing anion and cation contained in condensed water (18c).    USE - Fuel-cell electric-power generation system is used in domestic cogeneration systems.    ADVANTAGE - The fuel-cell electric-power generation system has a simplified water-treatment system integrated in it. The load of ion-exchange resin is reduced and durability of ion-exchange resin is improved. The fuel-cell electric-power generation system has excellent economical efficiency and reliability, and prevents outflow of sulfur compound to reformed water. Performance of modification catalyst is maintained by suppressing decomposition of ion-exchange resin by oxidation.    DETAILED DESCRIPTION - A fuel-cell electric-power generation system consists of a fuel-cell main component comprising an anode (5a) and a cathode (5b), and a fuel-modification system (2). A hydrogen-rich gas (4) manufactured by the fuel-modification system which uses a hydrocarbon group fuel as raw material and mineral fuel and manufactures hydrogen-rich gas by steam modification reaction, is introduced as fuel into the anode. Hydrogen of anode reacts with in-air oxygen of cathode used as oxidizing agent to produce electric power. A battery cooling-water system is provided for pouring the battery cooling water for maintaining the operating temperature of fuel-cell main component. A condensed-water generator is provided for cooling the waste gas discharged from the fuel modification system or fuel-cell main component, and produce condensed water. A battery cooling-water tank (30) stores the battery cooling water coming out of the fuel-cell main component. A condensed-water tank (14) stores the condensed water produced by the condensed-water generator. A heat exchanger (22) cools the stored condensed water. An ion-exchange-resin tower filled with anion-exchange resin and cation-exchange resin is provided in the downstream of heat exchanger for removing anion and cation contained in condensed water after cooling with the heat exchanger. Water coming out of the ion-exchange-resin tower is merged with water (18d) coming out of the cooling-water tank, and piped to be introduced to the fuel-cell main component by using the confluent water (18e) as battery cooling water.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of the fuel-cell electric-power generation system. (Drawing includes non-English language text)    Fuel-modification system (2)    Hydrogen-rich gas (4)    Fuel-cell main component (5)    Anode (5a)    Cathode (5b)    Condensed water (11)    Condensed-water tank (14)    Condensed water after cooling with the heat exchanger (18c)    Cooling water from battery cooling-water tank (18d)    Confluent water (18e)    Cation-exchange resin (23a)    Anion-exchange resin (23b)    Ion-exchange-resin tower (24)    Battery cooling-water tank (30)