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1. (WO2015044684) ANODE BLEED CONTROL IN A FUEL CELL STACK

Pub. No.:    WO/2015/044684    International Application No.:    PCT/GB2014/052932
Publication Date: Fri Apr 03 01:59:59 CEST 2015 International Filing Date: Tue Sep 30 01:59:59 CEST 2014
IPC: H01M 8/04
H01M 8/10
Applicants: INTELLIGENT ENERGY LIMITED
Inventors: RAMA, Pratap
ADCOCK, Paul Leonard
PATEL, Jignesh Karsan Devshi
Title: ANODE BLEED CONTROL IN A FUEL CELL STACK
Abstract:
An electrochemical fuel cell assembly comprises a fuel cell stack having a fuel delivery inlet and a fuel delivery outlet. The fuel cell stack further includes a number of fuel cells each having a membrane-electrode assembly and a fluid flow path coupled between the fuel delivery inlet and the fuel delivery outlet for delivery of fuel to the membrane- electrode assembly. A fuel delivery conduit is coupled to the fuel delivery inlet for delivery of fluid fuel to the stack. A bleed conduit is coupled to the fuel delivery outlet for venting fluid out of the stack. A variable orifice flow control device coupled to the bleed conduit configured to dynamically vary an amount of fluid from the fuel delivery outlet passing into the bleed conduit as a function of one or more of the control parameters: (i) measured fuel concentration; (ii) measured humidity; (iii) cell voltages of fuel cells in the stack; (iv) impedance of fuel cells in the stack; (v) resistance of fuel cells in the stack. The variable orifice flow control device may be coupled to a recirculation conduit and may be configured to dynamically vary a proportion of fluid from the fuel delivery outlet passing into the bleed conduit as a function of the control parameters.