Passive anode gas recovery system for fuel cell

A passive anode gas recovery system for fuel cells disposed on an anode of a fuel cell for effectively recycling and reuse of hydrogen gas not reacted comprising:

• a fuel cell having a fuel input end and a fuel output end disposed on an anode thereof;
• a fuel supply device used for storage of hydrogen gas the fuel cell required;
• an electronically controlled regulator that is connected to the fuel supply device and is used for regulating a pressure of the hydrogen gas from the fuel supply device and outputting the hydrogen gas;
• a first ejection module having a first solenoid valve, a first ejector and a first hydrogen gas flow meter;
• one end of the first ejection module receiving the hydrogen gas that comes from the fuel supply device and having the pressure regulated by the electronically controlled regulator;
• the first solenoid valve allowing the hydrogen gas entering the first ejector to be pressured and then the hydrogen gas passing through the other end of the first ejection module and the fuel input end to be used by the fuel cell;
• the first hydrogen gas flow meter connected to the first ejector for monitoring flow rate of the hydrogen gas output (by) from the first ejector;
• a second ejection module connected to the first ejection module in parallel and including a second solenoid valve, a second ejector and a second hydrogen gas flow meter;
• a hydrogen recovery module that includes a third hydrogen gas flow meter and a fourth hydrogen gas flow meter;
• one end of the third hydrogen gas flow meter and one end of the fourth hydrogen gas flow meter are connected to the fuel output end of the fuel cell while the other end of the fourth hydrogen gas flow meter and the other end of the third hydrogen gas flow meter are respectively connected to the first ejector and the second ejector for monitoring flow rate of the hydrogen gas recovered;
• and
• a controller connected to the fuel supply device and used for receiving parameters output from the first hydrogen gas flow meter, the second hydrogen gas flow meter, the third hydrogen gas flow meter, and the fourth hydrogen gas flow meter to judge the hydrogen gas should be recovered to the first ejector or the second ejector by the hydrogen recovery module for recycling and reuse;
• the first ejector and the second ejector respectively having a plurality of orifices with different diameters and made from electrochromic materials;
• the controller provides proper current for adjustment of the diameter of the orifice.