A SYSTEM FOR CONTROLLING FUEL FLOW IN PROTON EXCHANGE MEMBRANE FUEL CELLS AND A FUEL EJECTOR

摘要

The present invention concerns a system and a fuel ejector for controlling the fuel flow in proton exchange membrane fuel cells. The ejector comprises a nozzle receiving pressurized fuel from a first inlet into said ejector and including a first tapered section narrowing towards the outlet end of said nozzle in order to provide a flow of fuel, a second inlet for receiving recirculated fuel from a proton exchange membrane fuel cell, a diffuser comprising at least a second tapered section receiving fuel from said nozzle and said second inlet, and an outlet for delivering fuel from said diffuser to the anode system of said proton exchange membrane fuel cell. A shaped elongate rod having a butt end and an opposite pointed is movable lengthwise along its axis to engage with said first tapered section in order to provide a fuel flow control means for the fuel at the outlet of said nozzle. The rod is extending to said at least one second tapered section in order to provide a restriction means for a fuel flow through said diffuser, and wherein said rod is provided at its butt end with a control mechanism arranged to move said rod lengthwise in order to vary the fuel flow path geometry at the outlet of said nozzle and at said diffuser.