NOVELTY - A hydrogen purification pressure-rise system has a fuel-supply piping, modifier which produces reformed gas by reforming the fuel, gas detector which measures carbon monoxide density and hydrogen concentration in hydrogen-containing-gas obtained from reformed gas, hydrogen purification booster which produces purified hydrogen gas, pressurized gas supply piping, nitrogen gas supply piping for purge, waste-water port, and hydrogen tank which stores the purified hydrogen gas.    USE - Pressure-rise system is used for producing purified hydrogen used as fuel for polymer electrolyte fuel cell for motor vehicle.    ADVANTAGE - The system produces purified hydrogen by safe and efficient method.    DETAILED DESCRIPTION - A hydrogen purification pressure-rise system has a fuel-supply piping which supplies fuel, modifier which produces reformed gas by reforming the fuel, and contains hydrogen and carbon monoxide, gas detector which consists of reformed gas or measures carbon monoxide density and hydrogen concentration in hydrogen-containing-gas obtained from the reformed gas, hydrogen purification booster which pressure-rises and purifies hydrogen in the hydrogen-containing-gas to produce purified hydrogen gas by applying voltage between anode and cathode which are arranged on both sides of electrolytic membrane, pressurized gas supply piping which supplies pressurized gas in outer shell of the hydrogen purification booster, nitrogen gas supply piping for purge which discharges gas remained in the hydrogen purification booster, waste-water port which discharges moisture content contained in the purified hydrogen gas, and hydrogen tank which stores the purified hydrogen gas. An INDEPENDENT CLAIM is included for operating method of hydrogen purification pressure-rise system.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of unit cell of the hydrogen purification boosters in the pressure-rise system. (Drawing includes non-English language text)    Unit cell (8)    Separator (8a)    Gasket (12)    Cathode-side flow path (30a)    Solid polymer electrolyte membrane (40)