US 11,862,823 B2
Fuel cell system and method for recirculation of exhaust gas in a fuel cell system
David Reichholf, Graz (AT); Rene Buchgraber, Gleisdorf (AT); and Richard Schauperl, Graz (AT)
Assigned to AVL List GmbH, Graz (AT)
Appl. No. 17/297,477
Filed by AVL List GmbH, Graz (AT)
PCT Filed Nov. 27, 2019, PCT No. PCT/AT2019/060402
§ 371(c)(1), (2) Date May 27, 2021,
PCT Pub. No. WO2020/107047, PCT Pub. Date Jun. 4, 2020.
Claims priority of application No. A 51048/2018 (AT), filed on Nov. 27, 2018.
Prior Publication US 2022/0052360 A1, Feb. 17, 2022
Int. Cl. H01M 8/04119 (2016.01); H01M 8/04029 (2016.01); H01M 8/04746 (2016.01)
CPC H01M 8/04119 (2013.01) [H01M 8/04029 (2013.01); H01M 8/04753 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A fuel cell system (100), comprising:
at least at least one fuel cell stack (1) having:
at least one cathode section (K) and
at least one anode section (A),
an air supply section (3) for supplying air (2) to the anode section (A) of the fuel cell stack (1),
an exhaust air section (4) for discharging exhaust air (5) from the anode section (A) of the fuel cell stack (1),
a supply section (7) for supplying at least one main medium (6) to the cathode section (K) of the fuel cell stack (1),
and exhaust gas discharge section (9) for discharging exhaust gas (8) from the cathode section (K) of the fuel cell stack (1), and
a pump (12) for delivering the at least one main medium (6),
wherein the exhaust gas discharge section (9) is fluidically connected via a recirculation section (14) to the supply section (7) downstream of the pump (12) in order to recirculate exhaust gas (8),
wherein the recirculation section (14) is connected via a jet pump (16) to the supply section (7) in order to introduce recirculated exhaust gas (8) as the secondary flow (20) of the jet pump (16) into the at least one gaseous main medium (6) as the primary flow (18) of the jet pump (16),
wherein a first heat exchanger (21) for heating at least one liquid main medium (6) is arranged between the pump (12) and the jet pump (16);
wherein the at least one heated main medium (6) is heated by the first heat exchanger (21) such that the heated main medium (6) evaporates on account of the pressure drop in the jet pump (16).