A system for generating hydrogen comprising: reactors for containing an aqueous hydrogen gas, water, and a reaction body which contains a metal catalyst reactant, wherein the water and the metal catalyst reactant react to produce the aqueous hydrogen gas and a reacting solution which contains a metal catalyst oxide, with each said reactor provided with a vent valve for discharging the aqueous hydrogen gas, a water admitting valve for controlling a water feed, and a water draining valve for discharging the reacting solution; a gas collecting chamber connected to the vent valve of each said reactor to collect the aqueous hydrogen gas discharged from the reactor; anda water replenishing chamber connected to the water admitting valves of the reactors to replenish the water required for a reaction which occurs in the reactors. The system further includes a gas filtering chamber, a buffer chamber, a temporary storage chamber, settling tanks, a screw cleaner, and hardware therebetween, such as communication pipes and valves, to provide an environment-friendly hydrogen-mixed gas. The hydrogen-mixed gas is flammable, and has hydrogen content of 30% or above. The reactors are connected by openable/closable connection valves through gas-delivering pipes such that the metal catalyst reactant in each reactor reacts with water independently, allowing the system to operate around the clock and every day and thereby be conducive to mass production.
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